/* roulang page: index */
:root{
  --brand:#F4571E;
  --brand-dark:#D9450F;
  --brand-soft:rgba(244,87,30,.10);
  --cyan:#12C9A8;
  --cyan-soft:rgba(18,201,168,.12);
  --ink:#14161A;
  --ink-2:#3A3E45;
  --muted:#6B7079;
  --bg:#F7F5F2;
  --surface:#FFFFFF;
  --surface-2:#FAF8F6;
  --line:rgba(20,22,26,.08);
  --line-strong:rgba(20,22,26,.14);
  --radius-card:16px;
  --radius-btn:10px;
  --radius-input:12px;
  --radius-pill:999px;
  --shadow-sm:0 1px 2px rgba(20,22,26,.05);
  --shadow-md:0 8px 24px -8px rgba(20,22,26,.14);
  --shadow-lg:0 20px 48px -16px rgba(20,22,26,.18);
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-cn:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:"SFMono-Regular","JetBrains Mono",Menlo,Consolas,"Courier New",monospace;

  --bs-primary:#F4571E;
  --bs-primary-rgb:244,87,30;
  --bs-body-bg:#F7F5F2;
  --bs-body-color:#14161A;
  --bs-body-font-family:var(--font-cn);
  --bs-border-radius:16px;
  --bs-border-radius-sm:12px;
  --bs-border-color:rgba(20,22,26,.08);
  --bs-link-color:#D9450F;
  --bs-link-hover-color:#F4571E;
  --bs-font-sans-serif:var(--font-cn);
  --bs-secondary-color:#6B7079;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--brand-dark);text-decoration:none;transition:color .18s var(--ease);}
a:hover{color:var(--brand);}
button{font-family:inherit;}
h1,h2,h3,h4,h5{margin:0;color:var(--ink);letter-spacing:-.01em;font-weight:700;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:20px;
  padding-right:20px;
}
@media (min-width:1400px){
  .container{max-width:1280px;padding-left:24px;padding-right:24px;}
}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em;}

/* ============ 通用区块 ============ */
.section{padding:96px 0;}
.section--tight{padding:72px 0;}
.section--alt{background:var(--surface-2);}
@media (max-width:767.98px){
  .section{padding:56px 0;}
  .section--tight{padding:48px 0;}
}

.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-bottom:32px;
}
.section-head .eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  font-weight:600;
  color:var(--brand);
  letter-spacing:.08em;
  text-transform:uppercase;
  margin-bottom:10px;
}
.section-head .eyebrow::before{
  content:"";
  width:22px;height:2px;background:var(--brand);border-radius:2px;
}
.section-title{
  font-size:clamp(25px,3.3vw,34px);
  font-weight:700;
  letter-spacing:-.015em;
  line-height:1.3;
}
.section-desc{
  margin-top:10px;
  color:var(--muted);
  font-size:15px;
  max-width:580px;
}
.section-more{
  flex:0 0 auto;
  font-size:14px;
  font-weight:600;
  color:var(--brand-dark);
  display:inline-flex;
  align-items:center;
  gap:6px;
  white-space:nowrap;
}
.section-more i{transition:transform .18s var(--ease);}
.section-more:hover i{transform:translateX(3px);}

/* ============ 按钮 ============ */
.btn{
  --bs-btn-focus-box-shadow:none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  border-radius:var(--radius-btn);
  font-size:15px;
  font-weight:600;
  line-height:1;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}
.btn-primary{
  background:var(--brand);
  color:#fff;
  box-shadow:var(--shadow-md);
}
.btn-primary:hover{background:#FA6A33;color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.btn-primary:active{transform:translateY(0);background:var(--brand-dark);}
.btn-outline{
  background:transparent;
  border-color:var(--brand);
  color:var(--brand);
}
.btn-outline:hover{background:var(--brand-soft);color:var(--brand-dark);transform:translateY(-2px);}
.btn-outline:active{transform:translateY(0);}
.btn-ghost{
  background:var(--surface);
  border-color:var(--line-strong);
  color:var(--ink-2);
}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);}
.btn-sm{height:42px;padding:0 18px;font-size:14px;}
.btn-block{width:100%;}
.btn-group-row{display:flex;flex-wrap:wrap;gap:12px;}
@media (max-width:575.98px){
  .btn-group-row .btn{width:100%;}
}

/* ============ 徽章 / 标签 ============ */
.badge-pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 12px;
  border-radius:var(--radius-pill);
  font-size:12.5px;
  font-weight:600;
  line-height:1.6;
  background:var(--brand-soft);
  color:var(--brand-dark);
}
.badge-pill.is-cyan{background:var(--cyan-soft);color:#0E9E85;}
.badge-pill.is-plain{background:var(--surface-2);color:var(--muted);border:1px solid var(--line);}
.badge-pill i{font-size:11px;}

/* ============ 卡片 ============ */
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-sm);
  padding:24px;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),border-color .24s var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--line-strong);}
@media (max-width:767.98px){
  .card{padding:20px;}
}

/* ============ 顶部导航 ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:1030;
  background:rgba(247,245,242,.94);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s var(--ease);
}
.site-header.is-scrolled{box-shadow:var(--shadow-md);}
.hd-inner{
  height:72px;
  display:flex;
  align-items:center;
  gap:22px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.brand-mark{
  width:34px;height:34px;
  border-radius:10px;
  background:var(--ink);
  color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);
  font-size:15px;
  font-weight:700;
  position:relative;
}
.brand-mark::after{
  content:"";
  position:absolute;
  right:-2px;bottom:-2px;
  width:10px;height:10px;
  border-radius:3px;
  background:var(--brand);
}
.brand-text{
  font-size:15.5px;
  font-weight:800;
  color:var(--ink);
  letter-spacing:-.01em;
  line-height:1.2;
  max-width:132px;
}
.brand-text em{font-style:normal;color:var(--brand);}
.main-nav{
  display:flex;
  align-items:center;
  gap:4px;
  margin-left:8px;
}
.nav-link{
  position:relative;
  padding:8px 12px;
  font-size:14.5px;
  font-weight:600;
  color:var(--ink-2);
  border-radius:8px;
  white-space:nowrap;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:2px;
  height:2px;
  border-radius:2px;
  background:var(--brand);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s var(--ease);
}
.nav-link:hover{color:var(--ink);}
.nav-link:hover::after,.nav-link.active::after{transform:scaleX(1);}
.nav-link.active{color:var(--ink);}
.hd-right{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:10px;
}
.cmd-search{
  position:relative;
  display:flex;
  align-items:center;
  width:240px;
  height:42px;
  background:var(--surface);
  border:1px solid var(--line-strong);
  border-radius:var(--radius-input);
  padding:0 10px 0 12px;
  transition:width .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.cmd-search i{color:var(--muted);font-size:14px;}
.cmd-search input{
  flex:1;
  min-width:0;
  border:0;
  background:transparent;
  height:100%;
  padding:0 8px;
  font-size:14px;
  color:var(--ink);
  outline:none;
}
.cmd-search input::placeholder{color:#9AA0A8;}
.cmd-search kbd{
  font-family:var(--font-mono);
  font-size:11px;
  color:var(--muted);
  background:var(--surface-2);
  border:1px solid var(--line);
  border-radius:6px;
  padding:2px 6px;
  white-space:nowrap;
}
.cmd-search:focus-within{
  width:320px;
  border-color:var(--brand);
  box-shadow:0 0 0 2px var(--brand-soft);
}
.icon-btn{
  width:42px;height:42px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:var(--radius-input);
  border:1px solid var(--line-strong);
  background:var(--surface);
  color:var(--ink-2);
  transition:color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.icon-btn:hover{color:var(--brand);border-color:var(--brand);transform:translateY(-2px);}
.nav-toggle{
  display:none;
  width:42px;height:42px;
  border-radius:var(--radius-input);
  border:1px solid var(--line-strong);
  background:var(--surface);
  color:var(--ink);
  align-items:center;justify-content:center;
}
.drawer{
  position:fixed;
  top:0;right:0;
  width:min(340px,86vw);
  height:100%;
  background:var(--surface);
  border-left:1px solid var(--line);
  box-shadow:var(--shadow-lg);
  transform:translateX(102%);
  transition:transform .26s var(--ease);
  z-index:1060;
  padding:22px 20px;
  display:flex;
  flex-direction:column;
  gap:18px;
  overflow-y:auto;
}
.drawer.open{transform:translateX(0);}
.drawer-mask{
  position:fixed;inset:0;
  background:rgba(20,22,26,.36);
  opacity:0;visibility:hidden;
  transition:opacity .22s var(--ease),visibility .22s var(--ease);
  z-index:1050;
}
.drawer-mask.open{opacity:1;visibility:visible;}
.drawer .drawer-nav{display:flex;flex-direction:column;gap:4px;}
.drawer .drawer-nav a{
  padding:12px 14px;
  border-radius:12px;
  font-size:15px;
  font-weight:600;
  color:var(--ink-2);
  border:1px solid transparent;
}
.drawer .drawer-nav a:hover{background:var(--surface-2);color:var(--ink);}
.drawer .drawer-nav a.active{background:var(--brand-soft);color:var(--brand-dark);border-color:rgba(244,87,30,.22);}
.drawer .cmd-search{width:100%;}
.drawer .cmd-search:focus-within{width:100%;}
.drawer-close{
  align-self:flex-end;
  width:38px;height:38px;border-radius:10px;
  border:1px solid var(--line-strong);background:var(--surface);
  color:var(--ink);display:flex;align-items:center;justify-content:center;
}

@media (max-width:1199.98px){
  .cmd-search{width:180px;}
  .cmd-search:focus-within{width:220px;}
}
@media (max-width:991.98px){
  .hd-inner{height:64px;gap:14px;}
  .main-nav{display:none;}
  .cmd-search{display:none;}
  .nav-toggle{display:inline-flex;}
  .brand-text{font-size:14.5px;max-width:118px;}
}

/* ============ Hero ============ */
.hero{
  position:relative;
  padding:72px 0 0;
  background:linear-gradient(180deg,#FDFCFB 0%,var(--bg) 100%);
  overflow:hidden;
}
.hero-grid{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:48px;
  align-items:center;
}
.hero-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;
  border-radius:var(--radius-pill);
  background:var(--surface);
  border:1px solid var(--line);
  box-shadow:var(--shadow-sm);
  font-size:13px;
  font-weight:600;
  color:var(--ink-2);
  margin-bottom:20px;
}
.hero-tag .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 4px var(--cyan-soft);}
.hero h1{
  font-size:clamp(32px,4.6vw,54px);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.02em;
}
.hero h1 .hl{color:var(--brand);}
.hero-sub{
  margin-top:18px;
  font-size:17px;
  color:var(--muted);
  line-height:1.7;
  max-width:440px;
}
.hero-cta{margin-top:30px;}
.trust-bar{
  margin-top:56px;
  border-top:1px solid var(--line);
  padding:18px 0 26px;
  display:flex;
  flex-wrap:wrap;
  gap:12px 44px;
}
.trust-item{
  display:flex;
  align-items:baseline;
  gap:10px;
  font-size:13px;
  color:var(--muted);
}
.trust-item b{
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:700;
  color:var(--ink);
  letter-spacing:-.01em;
}
.hero-visual{position:relative;}
.hero-frame{
  position:relative;
  border-radius:24px;
  overflow:hidden;
  border:1px solid var(--line);
  box-shadow:var(--shadow-lg);
  background:#1A1C21;
  aspect-ratio:16/11;
}
.hero-frame img{
  width:100%;height:100%;
  object-fit:cover;
  opacity:.55;
  filter:saturate(.85);
}
.hero-frame::after{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(200deg,rgba(20,22,26,.18) 0%,rgba(20,22,26,.78) 100%);
}
.phone-mock{
  position:absolute;
  left:24px;
  bottom:0;
  width:212px;
  max-width:44%;
  border-radius:20px 20px 0 0;
  background:var(--surface);
  border:1px solid var(--line);
  border-bottom:0;
  box-shadow:0 -14px 40px -18px rgba(20,22,26,.4);
  overflow:hidden;
}
.phone-mock .pm-top{
  height:34px;
  background:var(--surface-2);
  border-bottom:1px solid var(--line);
  display:flex;align-items:center;gap:6px;
  padding:0 12px;
}
.phone-mock .pm-top span{width:8px;height:8px;border-radius:50%;background:var(--line-strong);}
.phone-mock .pm-top span:first-child{background:var(--brand);}
.phone-mock .pm-body{padding:14px 14px 18px;}
.phone-mock .pm-body .pm-line{
  height:9px;border-radius:5px;background:var(--surface-2);margin-bottom:9px;
}
.phone-mock .pm-body .pm-line.w60{width:60%;}
.phone-mock .pm-body .pm-line.w80{width:80%;}
.phone-mock .pm-body .pm-btn{
  margin-top:14px;height:36px;border-radius:10px;background:var(--brand);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:12.5px;font-weight:600;
}
.hero-float{
  position:absolute;
  right:18px;
  top:22px;
  background:rgba(255,255,255,.96);
  border-radius:14px;
  padding:12px 16px;
  box-shadow:var(--shadow-md);
  border:1px solid var(--line);
}
.hero-float .num{
  font-family:var(--font-mono);
  font-size:20px;font-weight:700;color:var(--ink);line-height:1.2;
}
.hero-float .lbl{font-size:12px;color:var(--muted);}

@media (max-width:991.98px){
  .hero{padding:52px 0 0;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero-sub{max-width:none;}
  .trust-bar{margin-top:40px;gap:12px 28px;}
}
@media (max-width:575.98px){
  .phone-mock{width:150px;}
  .hero-float{padding:10px 12px;}
  .hero-float .num{font-size:17px;}
}

/* ============ 卖点列表 ============ */
.value-grid{
  display:grid;
  grid-template-columns:4fr 8fr;
  gap:48px;
  align-items:start;
}
.value-list{display:flex;flex-direction:column;}
.value-item{
  display:grid;
  grid-template-columns:64px 1fr;
  gap:20px;
  padding:26px 0;
  border-bottom:1px solid var(--line);
}
.value-item:first-child{padding-top:0;}
.value-item:last-child{border-bottom:0;padding-bottom:0;}
.value-num{
  font-family:var(--font-mono);
  font-size:22px;
  font-weight:700;
  color:var(--brand);
  line-height:1.3;
}
.value-item h3{font-size:19px;font-weight:700;margin-bottom:8px;}
.value-item p{color:var(--muted);font-size:15px;line-height:1.78;}
.value-sticky{position:sticky;top:104px;}
.value-sticky .card{padding:26px;}
.value-sticky .kv{display:flex;justify-content:space-between;padding:11px 0;border-bottom:1px solid var(--line);font-size:14px;}
.value-sticky .kv:last-child{border-bottom:0;}
.value-sticky .kv span{color:var(--muted);}
.value-sticky .kv b{font-family:var(--font-mono);color:var(--ink);font-weight:700;}
@media (max-width:991.98px){
  .value-grid{grid-template-columns:1fr;gap:32px;}
  .value-sticky{position:static;}
}
@media (max-width:575.98px){
  .value-item{grid-template-columns:44px 1fr;gap:14px;}
  .value-num{font-size:19px;}
}

/* ============ 截图轮播 ============ */
.shot-viewport{overflow:hidden;border-radius:var(--radius-card);}
.shot-track{display:flex;transition:transform .55s var(--ease);}
.shot-card{flex:0 0 100%;padding:0 2px;}
.shot-frame{
  position:relative;
  border-radius:var(--radius-card);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--surface);
  box-shadow:var(--shadow-sm);
  aspect-ratio:16/9;
}
.shot-frame img{width:100%;height:100%;object-fit:cover;}
.shot-caption{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-top:16px;
}
.shot-caption .sc-txt{font-size:15px;color:var(--muted);}
.shot-caption .sc-txt strong{color:var(--ink);font-weight:700;margin-right:8px;}
.shot-controls{
  display:flex;
  align-items:center;
  gap:18px;
  margin-top:24px;
}
.shot-progress{
  flex:1;
  height:3px;
  border-radius:3px;
  background:var(--line);
  overflow:hidden;
}
.shot-bar{
  display:block;
  height:100%;
  width:0;
  background:var(--brand);
  border-radius:3px;
}
.shot-bar.running{animation:shotProgress 5s linear forwards;}
.shot-bar.paused{animation-play-state:paused;}
@keyframes shotProgress{from{width:0;}to{width:100%;}}
.shot-index{
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--muted);
  white-space:nowrap;
}
.shot-index b{color:var(--ink);}
.shot-btns{display:flex;gap:8px;}
.shot-btns button{
  width:40px;height:40px;
  border-radius:10px;
  border:1px solid var(--line-strong);
  background:var(--surface);
  color:var(--ink-2);
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;
  transition:.16s var(--ease);
}
.shot-btns button:hover{border-color:var(--brand);color:var(--brand);}
.shot-btns button:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}

/* ============ 系统要求 ============ */
.req-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
}
.req-card .req-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-bottom:18px;
  border-bottom:1px solid var(--line);
}
.req-card .req-head h3{font-size:20px;}
.req-card .req-head i{color:var(--brand);font-size:20px;}
.req-row{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  padding:14px 0;
  border-bottom:1px solid var(--line);
}
.req-row:last-child{border-bottom:0;padding-bottom:4px;}
.req-row span{font-size:14.5px;color:var(--muted);}
.req-row b{
  font-family:var(--font-mono);
  font-size:14.5px;
  font-weight:700;
  color:var(--ink);
  text-align:right;
}
@media (max-width:767.98px){
  .req-grid{grid-template-columns:1fr;}
}

/* ============ 数据条 ============ */
.stat-strip{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  padding:32px 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.stat-item .stat-num{
  font-family:var(--font-mono);
  font-size:clamp(26px,3vw,34px);
  font-weight:700;
  color:var(--ink);
  line-height:1.2;
}
.stat-item .stat-num small{font-size:15px;font-weight:600;color:var(--muted);margin-left:2px;}
.stat-item .stat-lbl{font-size:13.5px;color:var(--muted);margin-top:6px;}
@media (max-width:767.98px){
  .stat-strip{grid-template-columns:repeat(2,1fr);gap:20px;}
}

/* ============ 评价墙 ============ */
.review-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
  align-items:start;
}
.review-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:22px;
  box-shadow:var(--shadow-sm);
  transition:transform .24s var(--ease),box-shadow .24s var(--ease);
}
.review-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.review-card.tilt-1{transform:rotate(-.8deg);}
.review-card.tilt-2{transform:rotate(.9deg);}
.review-card.tilt-3{transform:rotate(-.5deg);}
.review-card.tilt-1:hover,.review-card.tilt-2:hover,.review-card.tilt-3:hover{transform:rotate(0) translateY(-4px);}
.review-top{display:flex;align-items:center;gap:12px;margin-bottom:14px;}
.avatar{
  width:42px;height:42px;border-radius:50%;
  background:var(--surface-2);
  border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);
  font-weight:700;font-size:15px;color:var(--brand);
  flex:0 0 auto;
}
.review-name{font-size:14.5px;font-weight:700;}
.stars{color:var(--brand);font-size:12px;letter-spacing:2px;margin-top:2px;}
.review-text{font-size:14.8px;color:var(--ink-2);line-height:1.78;}
.review-meta{margin-top:14px;}
.review-col-offset{margin-top:34px;}
@media (max-width:991.98px){
  .review-grid{grid-template-columns:repeat(2,1fr);}
  .review-col-offset{margin-top:0;}
}
@media (max-width:575.98px){
  .review-grid{grid-template-columns:1fr;}
  .review-card.tilt-1,.review-card.tilt-2,.review-card.tilt-3{transform:none;}
}

/* ============ 资讯列表 ============ */
.news-card{
  display:flex;
  flex-direction:column;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  overflow:hidden;
  height:100%;
  box-shadow:var(--shadow-sm);
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),border-color .24s var(--ease);
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--line-strong);}
.news-cover{
  position:relative;
  aspect-ratio:16/10;
  overflow:hidden;
  background:var(--surface-2);
}
.news-cover img{width:100%;height:100%;object-fit:cover;transition:transform .24s var(--ease);}
.news-card:hover .news-cover img{transform:scale(1.03);}
.news-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1;}
.news-title{
  font-size:17px;
  font-weight:700;
  color:var(--ink);
  line-height:1.5;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.news-card-lg .news-title{font-size:21px;}
.news-summary{
  font-size:14.5px;
  color:var(--muted);
  line-height:1.72;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.news-foot{
  margin-top:auto;
  padding-top:14px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  border-top:1px solid var(--line);
}
.news-time{
  font-family:var(--font-mono);
  font-size:12.5px;
  color:var(--muted);
}
.news-mini{display:flex;gap:16px;align-items:stretch;}
.news-mini .news-cover{
  flex:0 0 132px;
  aspect-ratio:16/10;
  border-radius:12px;
  border:1px solid var(--line);
}
.news-mini .news-body{padding:0;gap:8px;}
.news-mini .news-title{font-size:15.5px;-webkit-line-clamp:2;}
.news-mini .news-summary{-webkit-line-clamp:2;font-size:13.5px;}
.news-mini .news-foot{padding-top:8px;}
.news-list-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:16px;
  box-shadow:var(--shadow-sm);
  transition:transform .24s var(--ease),box-shadow .24s var(--ease);
}
.news-list-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);}
.empty-state{
  border:1px dashed var(--line-strong);
  border-radius:var(--radius-card);
  background:var(--surface);
  padding:56px 24px;
  text-align:center;
}
.empty-state .es-ico{
  width:58px;height:58px;
  margin:0 auto 16px;
  border-radius:16px;
  background:var(--brand-soft);
  color:var(--brand);
  display:flex;align-items:center;justify-content:center;
  font-size:22px;
}
.empty-state p{color:var(--muted);font-size:15px;margin-bottom:20px;}
@media (max-width:575.98px){
  .news-mini{flex-direction:column;}
  .news-mini .news-cover{flex:none;width:100%;}
}

/* ============ 下载按钮组 ============ */
.dl-band{
  background:var(--ink);
  color:#fff;
  border-radius:24px;
  padding:44px;
  display:grid;
  grid-template-columns:8fr 4fr;
  gap:32px;
  align-items:center;
}
.dl-band h2{color:#fff;font-size:clamp(22px,2.6vw,30px);font-weight:700;}
.dl-band .dl-sub{color:rgba(255,255,255,.62);font-size:14px;margin-top:10px;}
.dl-band .dl-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px;}
.dl-band .btn-primary{box-shadow:none;}
.dl-band .btn-on-dark{
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.24);
  color:#fff;
}
.dl-band .btn-on-dark:hover{background:rgba(255,255,255,.16);color:#fff;transform:translateY(-2px);}
.dl-note{
  color:rgba(255,255,255,.55);
  font-size:12px;
  font-family:var(--font-mono);
  margin-top:16px;
}
.qr-box{
  background:#fff;
  border-radius:12px;
  width:138px;
  height:138px;
  display:grid;
  grid-template-columns:repeat(5,1fr);
  grid-template-rows:repeat(5,1fr);
  gap:4px;
  padding:12px;
  margin-left:auto;
}
.qr-box span{background:#E9E6E2;border-radius:3px;}
.qr-box span.on{background:var(--ink);}
.dl-side{text-align:center;}
.dl-side .qr-cap{color:rgba(255,255,255,.6);font-size:12.5px;margin-top:12px;}
@media (max-width:991.98px){
  .dl-band{grid-template-columns:1fr;padding:32px;}
  .qr-box{margin:0 auto;}
  .dl-side{text-align:center;}
}

/* ============ FAQ ============ */
.faq-wrap{max-width:880px;}
.faq-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  margin-bottom:12px;
  overflow:hidden;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.faq-item.open{border-color:rgba(244,87,30,.3);box-shadow:var(--shadow-sm);}
.faq-q{
  width:100%;
  min-height:64px;
  background:none;
  border:0;
  padding:16px 20px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  text-align:left;
  font-size:16px;
  font-weight:600;
  color:var(--ink);
  cursor:pointer;
}
.faq-q:focus-visible{outline:2px solid var(--brand);outline-offset:-2px;}
.faq-icon{
  flex:0 0 auto;
  width:26px;height:26px;
  border-radius:8px;
  background:var(--brand-soft);
  color:var(--brand-dark);
  display:flex;align-items:center;justify-content:center;
  font-size:15px;
  transition:transform .22s var(--ease);
}
.faq-item.open .faq-icon{transform:rotate(45deg);}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .28s var(--ease);
}
.faq-a-inner{
  padding:0 20px 20px;
  color:var(--ink-2);
  font-size:15px;
  line-height:1.82;
}
.faq-item.open .faq-a-inner{background:var(--surface-2);border-radius:12px;margin:0 12px 12px;padding:20px;}

/* ============ 页脚 ============ */
.site-footer{
  background:var(--surface-2);
  border-top:1px solid var(--line);
  padding:64px 0 28px;
  margin-top:0;
}
.footer-grid{
  display:grid;
  grid-template-columns:4fr 6fr 2fr;
  gap:40px;
}
.footer-brand .brand{margin-bottom:14px;}
.footer-brand p{font-size:14px;color:var(--muted);max-width:290px;line-height:1.8;}
.footer-links{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.footer-col h4{
  font-size:14px;
  font-weight:700;
  margin-bottom:14px;
  color:var(--ink);
}
.footer-col a{
  display:block;
  font-size:14px;
  color:var(--muted);
  padding:5px 0;
}
.footer-col a:hover{color:var(--brand);text-decoration:underline;text-underline-offset:3px;}
.footer-qr{
  justify-self:end;
  text-align:center;
}
.footer-qr .qr-box{margin:0 auto;border:1px solid var(--line);}
.footer-qr .qr-box span{background:#EFECE8;}
.footer-qr .qr-box span.on{background:var(--ink);}
.footer-qr .cap{font-size:13px;color:var(--muted);margin-top:10px;}
.footer-contact{font-size:13.5px;color:var(--muted);margin-top:12px;line-height:1.9;}
.footer-bottom{
  margin-top:44px;
  padding-top:22px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-size:13px;
  color:var(--muted);
}
.footer-bottom a{color:var(--muted);}
.footer-bottom a:hover{color:var(--brand);}
@media (max-width:991.98px){
  .footer-grid{grid-template-columns:1fr;gap:32px;}
  .footer-qr{justify-self:start;}
}
@media (max-width:575.98px){
  .footer-links{grid-template-columns:1fr 1fr;}
}

/* ============ 动效 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
  .reveal{opacity:1;transform:none;}
  .shot-bar.running{animation:none;width:100%;}
}

/* roulang page: category1 */
:root{
  --brand:#F4571E;
  --brand-dark:#D9450F;
  --brand-soft:rgba(244,87,30,.08);
  --brand-soft-2:rgba(244,87,30,.14);
  --teal:#12C9A8;
  --teal-soft:rgba(18,201,168,.12);
  --ink:#14161A;
  --ink-2:#3A3F47;
  --muted:#71767F;
  --bg:#F7F5F2;
  --surface:#FFFFFF;
  --surface-2:#FAF8F6;
  --line:rgba(20,22,26,.08);
  --line-strong:rgba(20,22,26,.16);
  --radius-card:16px;
  --radius-btn:10px;
  --radius-input:12px;
  --radius-pill:999px;
  --shadow-sm:0 1px 2px rgba(20,22,26,.05);
  --shadow-md:0 8px 24px -8px rgba(20,22,26,.14);
  --shadow-lg:0 20px 48px -16px rgba(20,22,26,.18);
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-cn:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-num:"Inter","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --bs-primary:#F4571E;
  --bs-primary-rgb:244,87,30;
  --bs-body-font-family:var(--font-cn);
  --bs-body-color:#3A3F47;
  --bs-body-bg:#F7F5F2;
  --bs-border-radius:16px;
  --bs-border-radius-sm:10px;
  --bs-border-radius-lg:16px;
  --bs-link-color:#F4571E;
  --bs-link-hover-color:#D9450F;
  --bs-border-color:rgba(20,22,26,.08);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.75;
  color:var(--ink-2);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .18s var(--ease)}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
h1,h2,h3,h4{color:var(--ink);margin:0;font-weight:700;line-height:1.3}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
@media (min-width:1400px){.container{max-width:1280px}}

/* ============ 顶部命令栏 ============ */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(247,245,242,.92);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s var(--ease),background .2s var(--ease);
}
.site-header.is-scrolled{box-shadow:var(--shadow-md);background:rgba(255,255,255,.94)}
.header-inner{display:flex;align-items:center;gap:20px;height:72px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:36px;height:36px;border-radius:11px;
  background:var(--brand);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-num);font-weight:700;font-size:18px;
  box-shadow:0 6px 16px -6px rgba(244,87,30,.6);
}
.brand-text{font-size:16px;font-weight:700;color:var(--ink);letter-spacing:-.01em;white-space:nowrap}
.brand-text em{font-style:normal;color:var(--brand)}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:8px}
.nav-link{
  position:relative;padding:8px 12px;border-radius:8px;
  font-size:15px;font-weight:600;color:var(--ink-2);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--brand);border-radius:2px;
  transform:scaleX(0);transform-origin:left;
  transition:transform .18s var(--ease);
}
.nav-link:hover{color:var(--brand);background:var(--brand-soft)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.active{color:var(--brand)}
.nav-link.active::after{transform:scaleX(1)}
.header-tools{display:flex;align-items:center;gap:12px;margin-left:auto}
.command-search{
  position:relative;display:flex;align-items:center;
  width:240px;height:44px;padding:0 12px;
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-input);
  transition:width .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.command-search:focus-within{
  width:320px;border-color:var(--brand);
  box-shadow:0 0 0 4px rgba(244,87,30,.12);
}
.command-search svg{width:16px;height:16px;stroke:var(--muted);flex-shrink:0}
.command-search input{
  flex:1;min-width:0;border:0;outline:0;background:transparent;
  font-family:inherit;font-size:14px;color:var(--ink);padding:0 8px;
}
.command-search input::placeholder{color:#9BA0A8}
.command-search kbd{
  font-family:var(--font-num);font-size:11px;color:var(--muted);
  background:var(--surface-2);border:1px solid var(--line);
  border-radius:6px;padding:2px 6px;white-space:nowrap;
}
.btn{font-family:inherit;font-weight:600;border-radius:var(--radius-btn);border:1px solid transparent;
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);}
.btn-primary{
  background:var(--brand);color:#fff;height:44px;padding:0 20px;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:15px;
  box-shadow:var(--shadow-sm);
}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-2px);box-shadow:var(--shadow-md)}
.btn-primary:active{transform:translateY(0);box-shadow:var(--shadow-sm)}
.btn-outline{
  background:transparent;color:var(--brand);border:1px solid var(--brand);
  height:48px;padding:0 24px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:15px;
}
.btn-outline:hover{background:var(--brand-soft);color:var(--brand-dark);border-color:var(--brand-dark);transform:translateY(-2px)}
.btn-lg{height:48px;padding:0 24px;font-size:16px}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:var(--radius-input);
  border:1px solid var(--line);background:var(--surface);align-items:center;justify-content:center;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;position:relative}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink);border-radius:2px;
  transition:transform .2s var(--ease);
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.mobile-drawer{
  display:none;border-top:1px solid var(--line);background:var(--surface);
  padding:16px 24px 24px;
}
.mobile-drawer.open{display:block}
.mobile-drawer .nav-link{display:block;padding:12px 4px;border-radius:10px;font-size:16px}
.mobile-drawer .nav-link::after{display:none}
.mobile-drawer .nav-link.active{background:var(--brand-soft)}
.mobile-drawer .command-search{width:100%;margin:12px 0}
.mobile-drawer .command-search:focus-within{width:100%}
.mobile-drawer .btn-primary{width:100%;margin-top:8px}

@media (max-width:1199px){
  .command-search{width:200px}
  .command-search:focus-within{width:240px}
}
@media (max-width:991px){
  .main-nav,.header-tools .command-search,.header-tools .btn-primary{display:none}
  .nav-toggle{display:flex}
  .header-inner{height:64px}
}

/* ============ 面包屑 ============ */
.crumbs{padding:20px 0 0;font-size:13px;color:var(--muted)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.crumbs li{display:flex;align-items:center;gap:6px}
.crumbs li+li::before{content:"/";color:var(--line-strong);font-weight:300}
.crumbs a:hover{color:var(--brand)}
.crumbs .current{color:var(--ink-2);font-weight:600;max-width:320px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ============ Hero ============ */
.hero{padding:32px 0 64px}
.hero-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;font-weight:600;letter-spacing:.08em;color:var(--brand);
  background:var(--brand-soft);border-radius:var(--radius-pill);padding:6px 14px;margin-bottom:20px;
}
.hero h1{
  font-size:clamp(32px,5vw,52px);font-weight:800;letter-spacing:-.02em;line-height:1.18;margin-bottom:20px;
}
.hero h1 span{color:var(--brand)}
.hero-sub{font-size:17px;color:var(--ink-2);max-width:520px;margin-bottom:28px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:32px}
.trust-bar{
  border-top:1px solid var(--line);padding-top:18px;
  display:flex;flex-wrap:wrap;gap:28px;
}
.trust-item{font-size:13px;color:var(--muted);display:flex;flex-direction:column;gap:2px}
.trust-item b{font-family:var(--font-num);font-size:15px;color:var(--ink);font-weight:700}
.hero-visual{position:relative;border-radius:20px;overflow:hidden;box-shadow:var(--shadow-lg);aspect-ratio:16/11;background:var(--ink)}
.hero-visual img{width:100%;height:100%;object-fit:cover;opacity:.92}
.hero-visual::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(115deg,rgba(20,22,26,.68) 0%,rgba(20,22,26,.22) 55%,rgba(244,87,30,.22) 100%);
}
.hero-visual-badge{
  position:absolute;left:24px;bottom:24px;right:24px;z-index:2;
  background:rgba(255,255,255,.94);border-radius:14px;padding:16px 20px;
  display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;align-items:center;
}
.hero-visual-badge .k{font-size:12px;color:var(--muted)}
.hero-visual-badge .v{font-family:var(--font-num);font-size:15px;font-weight:700;color:var(--ink)}
@media (max-width:991px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero{padding:24px 0 48px}
}

/* ============ 通用区块 ============ */
section{scroll-margin-top:88px}
.section{padding:88px 0}
.section-alt{background:var(--surface)}
.section-head{max-width:720px;margin-bottom:40px}
.section-head .idx{
  font-family:var(--font-num);font-size:13px;font-weight:700;color:var(--brand);letter-spacing:.12em;
  display:block;margin-bottom:12px;
}
.section-head h2{font-size:clamp(26px,3.4vw,34px);font-weight:700;letter-spacing:-.015em;margin-bottom:14px}
.section-head p{font-size:16px;color:var(--muted)}
@media (max-width:767px){.section{padding:56px 0}}

/* ============ 步骤流程 ============ */
.steps{display:flex;flex-direction:column;gap:0;max-width:900px}
.step{
  position:relative;display:grid;grid-template-columns:104px 1fr;gap:28px;
  padding:28px 0;border-top:1px solid var(--line);
}
.step:first-child{border-top:0}
.step-no{
  font-family:var(--font-num);font-size:40px;font-weight:800;color:var(--brand);
  line-height:1;letter-spacing:-.03em;
}
.step-body h3{font-size:20px;font-weight:700;margin-bottom:10px}
.step-body p{font-size:16px;color:var(--ink-2);max-width:640px}
.step-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tag{
  font-size:12px;font-weight:600;padding:5px 12px;border-radius:var(--radius-pill);
  background:var(--brand-soft);color:var(--brand-dark);
}
.tag.teal{background:var(--teal-soft);color:#0B8F78}
.tag.neutral{background:var(--surface-2);color:var(--muted);border:1px solid var(--line)}
.step-note{
  margin-top:12px;font-size:14px;color:var(--muted);
  background:var(--surface-2);border-left:3px solid var(--brand);
  border-radius:0 10px 10px 0;padding:12px 16px;max-width:640px;
}
@media (max-width:767px){
  .step{grid-template-columns:1fr;gap:12px;padding:24px 0}
  .step-no{font-size:32px}
}

/* ============ 准备清单（非对称 4/8） ============ */
.prep-grid{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.prep-aside h2{font-size:clamp(24px,3vw,30px);font-weight:700;letter-spacing:-.015em;margin-bottom:16px}
.prep-aside p{font-size:16px;color:var(--muted);margin-bottom:20px}
.prep-list{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  box-shadow:var(--shadow-sm);overflow:hidden;
}
.prep-row{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:18px 24px;border-top:1px solid var(--line);
}
.prep-row:first-child{border-top:0}
.prep-row .label{font-size:15px;font-weight:600;color:var(--ink)}
.prep-row .desc{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-top:2px}
.prep-row .value{font-family:var(--font-num);font-size:15px;font-weight:700;color:var(--ink);white-space:nowrap}
.prep-row .value.brand{color:var(--brand)}
.prep-card{
  margin-top:20px;background:var(--surface-2);border:1px solid var(--line);
  border-radius:var(--radius-card);padding:20px 24px;
}
.prep-card p{font-size:14px;color:var(--muted)}
@media (max-width:991px){
  .prep-grid{grid-template-columns:1fr;gap:28px}
}

/* ============ 异常对照（7/5） ============ */
.issue-grid{display:grid;grid-template-columns:7fr 5fr;gap:32px;align-items:start}
.issue-list{display:flex;flex-direction:column;gap:16px}
.issue-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:24px;box-shadow:var(--shadow-sm);
  transition:transform .24s var(--ease),box-shadow .24s var(--ease);
}
.issue-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.issue-item h3{font-size:17px;font-weight:700;margin-bottom:10px;display:flex;align-items:center;gap:10px}
.issue-item h3 .dot{width:8px;height:8px;border-radius:50%;background:var(--brand);flex-shrink:0}
.issue-item p{font-size:15px;color:var(--ink-2)}
.side-card{
  background:var(--ink);color:#fff;border-radius:var(--radius-card);padding:28px;
  box-shadow:var(--shadow-md);position:sticky;top:96px;
}
.side-card h3{color:#fff;font-size:19px;font-weight:700;margin-bottom:16px}
.side-card ul{display:flex;flex-direction:column;gap:12px;margin-bottom:22px}
.side-card li{font-size:14px;color:rgba(255,255,255,.78);display:flex;gap:10px;align-items:flex-start}
.side-card li b{font-family:var(--font-num);color:var(--brand);font-weight:700}
.side-card .btn-outline{color:#fff;border-color:rgba(255,255,255,.4);width:100%}
.side-card .btn-outline:hover{background:rgba(255,255,255,.1);border-color:#fff;color:#fff}
@media (max-width:991px){
  .issue-grid{grid-template-columns:1fr}
  .side-card{position:static}
}

/* ============ FAQ ============ */
.faq-wrap{max-width:880px}
.faq-item{
  border-bottom:1px solid var(--line);
}
.faq-q{
  width:100%;background:transparent;border:0;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:20px 4px;text-align:left;
  font-family:inherit;font-size:16px;font-weight:600;color:var(--ink);
  transition:color .18s var(--ease);
}
.faq-q:hover{color:var(--brand)}
.faq-icon{
  position:relative;width:18px;height:18px;flex-shrink:0;
  transition:transform .2s var(--ease);
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--brand);border-radius:2px;
}
.faq-icon::before{top:8px;left:0;width:18px;height:2px}
.faq-icon::after{left:8px;top:0;width:2px;height:18px}
.faq-item.open .faq-icon{transform:rotate(45deg)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .28s var(--ease),padding .28s var(--ease);
  background:var(--surface-2);border-radius:var(--radius-input);
  margin:0 0 16px;padding:0 20px;
}
.faq-item.open .faq-a{max-height:420px;padding:20px}
.faq-a p{font-size:15px;color:var(--ink-2)}

/* ============ 深色下载条 ============ */
.cta-band{background:var(--ink);color:#fff;padding:56px 0}
.cta-inner{display:flex;flex-wrap:wrap;gap:32px;align-items:center;justify-content:space-between}
.cta-text h2{color:#fff;font-size:clamp(22px,2.6vw,28px);font-weight:700;margin-bottom:10px}
.cta-text p{font-size:14px;color:rgba(255,255,255,.7);max-width:520px}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px}
.cta-band .btn-primary{background:var(--brand)}
.cta-band .btn-outline{color:#fff;border-color:rgba(255,255,255,.36)}
.cta-band .btn-outline:hover{background:rgba(255,255,255,.12);border-color:#fff;color:#fff}
.cta-meta{margin-top:14px;font-size:12px;color:rgba(255,255,255,.55);font-family:var(--font-num)}
@media (max-width:767px){
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
}

/* ============ 页脚 ============ */
.site-footer{background:var(--surface);border-top:1px solid var(--line);padding:56px 0 24px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:4fr 6fr 2fr;gap:40px}
.footer-brand .brand{margin-bottom:14px}
.footer-brand p{color:var(--muted);max-width:280px;font-size:14px;line-height:1.7}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.footer-col h4{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:14px}
.footer-col a{display:block;color:var(--muted);font-size:14px;padding:5px 0}
.footer-col a:hover{color:var(--brand);text-decoration:underline;text-underline-offset:3px}
.footer-qr{justify-self:end;text-align:center}
.qr-box{
  width:104px;height:104px;background:#fff;border:1px solid var(--line);border-radius:12px;
  display:grid;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr);
  gap:4px;padding:10px;box-shadow:var(--shadow-sm);
}
.qr-box span{background:transparent;border-radius:2px}
.qr-box span.on{background:var(--ink)}
.footer-qr .cap{font-size:12px;color:var(--muted);margin-top:10px}
.footer-contact{font-size:12px;color:var(--muted);margin-top:8px;font-family:var(--font-num);line-height:1.7}
.footer-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:var(--muted);
}
.footer-bottom a{color:var(--muted)}
.footer-bottom a:hover{color:var(--brand)}
@media (max-width:991px){
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-qr{justify-self:start;text-align:left}
  .footer-links{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:575px){
  .container{padding:0 18px}
  .footer-links{grid-template-columns:1fr}
  .trust-bar{gap:18px}
}

/* ============ 入场动效 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: article */
:root{
  --brand:#F4571E;
  --brand-dark:#D9450F;
  --brand-soft:rgba(244,87,30,.08);
  --brand-line:rgba(244,87,30,.22);
  --ink:#14161A;
  --ink-2:#26292E;
  --muted:#5C6169;
  --muted-2:#8B9098;
  --bg:#F7F5F2;
  --card:#FFFFFF;
  --soft:#FAF8F6;
  --accent:#12C9A8;
  --accent-soft:rgba(18,201,168,.12);
  --line:rgba(20,22,26,.08);
  --line-strong:rgba(20,22,26,.14);
  --r-card:16px;
  --r-btn:10px;
  --r-input:12px;
  --r-pill:999px;
  --sh-sm:0 1px 2px rgba(20,22,26,.05);
  --sh-md:0 8px 24px -8px rgba(20,22,26,.14);
  --sh-lg:0 20px 48px -16px rgba(20,22,26,.18);
  --eas:cubic-bezier(.2,.8,.2,1);
  --font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC","Segoe UI",Roboto,sans-serif;
  --font-mono:"SFMono-Regular","JetBrains Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --bs-primary:#F4571E;
  --bs-primary-rgb:244,87,30;
  --bs-body-bg:#F7F5F2;
  --bs-body-color:#14161A;
  --bs-body-font-family:var(--font-sans);
  --bs-link-color:#F4571E;
  --bs-link-hover-color:#D9450F;
  --bs-border-color:rgba(20,22,26,.08);
  --bs-border-radius:16px;
  --bs-border-radius-sm:12px;
  --bs-border-radius-lg:20px;
  --bs-font-sans-serif:var(--font-sans);
  --bs-body-line-height:1.75;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img{max-width:100%;display:block;}
a{color:var(--brand);text-decoration:none;}
a:hover{color:var(--brand-dark);}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;letter-spacing:-.01em;color:var(--ink);}
p{margin:0;}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}

.container{
  max-width:1200px;
  padding-left:20px;
  padding-right:20px;
  margin-left:auto;
  margin-right:auto;
}
@media (min-width:1400px){.container{max-width:1280px;}}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(247,245,242,.94);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .24s var(--eas),background .24s var(--eas);
}
.site-header.is-scrolled{box-shadow:var(--sh-md);background:rgba(250,248,246,.98);}
.header-inner{display:flex;align-items:center;gap:18px;height:72px;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;color:var(--ink);text-decoration:none;}
.brand:hover{color:var(--ink);}
.brand-mark{
  width:34px;height:34px;border-radius:10px;
  background:var(--brand);color:#fff;
  display:grid;place-items:center;
  font-weight:800;font-size:16px;line-height:1;
  box-shadow:0 6px 16px -8px rgba(244,87,30,.9);
}
.brand-text{font-size:16px;font-weight:800;letter-spacing:-.01em;white-space:nowrap;}
.brand-text em{font-style:normal;color:var(--brand);font-weight:800;}

.main-nav{display:flex;align-items:center;gap:2px;margin-left:10px;}
.main-nav .nav-link{
  position:relative;
  padding:10px 12px;
  font-size:15px;font-weight:600;color:#3D4147;
  border-radius:8px;
  transition:color .16s var(--eas),background .16s var(--eas);
}
.main-nav .nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--brand);border-radius:2px;
  transform:scaleX(0);transform-origin:left;
  transition:transform .18s var(--eas);
}
.main-nav .nav-link:hover{color:var(--ink);background:rgba(20,22,26,.03);}
.main-nav .nav-link:hover::after,
.main-nav .nav-link.active::after{transform:scaleX(1);}
.main-nav .nav-link.active{color:var(--brand);}

.header-tools{margin-left:auto;display:flex;align-items:center;gap:10px;}
.command-search{
  display:flex;align-items:center;gap:8px;
  width:240px;height:42px;padding:0 10px 0 12px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-input);
  transition:width .22s var(--eas),border-color .22s var(--eas),box-shadow .22s var(--eas);
}
.command-search:focus-within{width:320px;border-color:var(--brand);box-shadow:0 0 0 2px rgba(244,87,30,.18);}
.command-search i{color:var(--muted-2);font-size:13px;}
.command-search input{
  flex:1;min-width:0;border:0;outline:0;background:transparent;
  font-size:14px;color:var(--ink);
}
.command-search input::placeholder{color:var(--muted-2);}
.keycap{
  font-size:11px;color:var(--muted-2);white-space:nowrap;
  border:1px solid var(--line);border-radius:6px;padding:1px 6px;line-height:1.5;
}
.icon-btn{
  width:42px;height:42px;border-radius:var(--r-input);
  display:grid;place-items:center;color:#3D4147;
  border:1px solid var(--line);background:#fff;
  transition:color .16s var(--eas),border-color .16s var(--eas),transform .16s var(--eas);
}
.icon-btn:hover{color:var(--brand);border-color:var(--brand-line);transform:translateY(-1px);}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:var(--r-input);
  border:1px solid var(--line);background:#fff;color:var(--ink);
  place-items:center;cursor:pointer;
}
.nav-toggle:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}

/* ---------- buttons ---------- */
.btn{
  --bs-btn-border-radius:10px;
  --bs-btn-padding-y:12px;
  --bs-btn-padding-x:24px;
  --bs-btn-font-weight:600;
  font-size:15px;
  line-height:1.4;
  border-width:1px;
  transition:transform .16s var(--eas),box-shadow .16s var(--eas),background .16s var(--eas),color .16s var(--eas),border-color .16s var(--eas);
}
.btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px;box-shadow:none;}
.btn-primary{
  --bs-btn-bg:var(--brand);
  --bs-btn-border-color:var(--brand);
  --bs-btn-hover-bg:var(--brand-dark);
  --bs-btn-hover-border-color:var(--brand-dark);
  --bs-btn-active-bg:var(--brand-dark);
  --bs-btn-active-border-color:var(--brand-dark);
  --bs-btn-disabled-bg:var(--brand);
  --bs-btn-disabled-border-color:var(--brand);
  color:#fff;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--sh-lg);color:#fff;}
.btn-primary:active{transform:none;box-shadow:var(--sh-sm);}
.btn-ghost{
  background:transparent;border:1px solid var(--brand);color:var(--brand);
  --bs-btn-hover-bg:var(--brand-soft);
  --bs-btn-hover-border-color:var(--brand);
  --bs-btn-hover-color:var(--brand-dark);
  --bs-btn-active-bg:var(--brand-soft);
  --bs-btn-active-color:var(--brand-dark);
}
.btn-ghost:hover{transform:translateY(-2px);}
.btn-cta{height:42px;padding:0 18px;font-size:14px;display:inline-flex;align-items:center;}

/* ---------- badges ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  border-radius:var(--r-pill);
  font-size:12.5px;font-weight:600;line-height:1;
  padding:7px 12px;
}
.badge-cat{background:var(--brand-soft);color:var(--brand);}
.badge-state{background:var(--accent-soft);color:#0E9E84;}
.badge-glass{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.22);}

/* ---------- article hero ---------- */
.article-hero{
  position:relative;
  padding:56px 0 52px;
  background:#14161A url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  color:#fff;
  overflow:hidden;
}
.article-hero::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(20,22,26,.86) 0%,rgba(20,22,26,.92) 100%);
}
.article-hero .container{position:relative;z-index:1;}
.breadcrumb-row{
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.62);margin-bottom:22px;
}
.breadcrumb-row a{color:rgba(255,255,255,.78);}
.breadcrumb-row a:hover{color:#fff;}
.breadcrumb-row .sep{color:rgba(255,255,255,.3);font-weight:400;}
.breadcrumb-row .current{
  max-width:52ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
  color:rgba(255,255,255,.62);
}
.article-hero h1{
  color:#fff;
  font-size:clamp(26px,3.6vw,40px);
  font-weight:800;
  letter-spacing:-.012em;
  line-height:1.3;
  margin:16px 0 20px;
  max-width:900px;
}
.meta-row{
  display:flex;align-items:center;flex-wrap:wrap;gap:14px;
  font-size:13.5px;color:rgba(255,255,255,.7);
}
.meta-row .vline{width:1px;height:12px;background:rgba(255,255,255,.26);display:inline-block;}
.meta-row .mono{color:#fff;font-size:13.5px;}

/* ---------- article body ---------- */
.article-main{padding:72px 0 0;}
.article-layout{display:flex;justify-content:center;}
.article-body{width:100%;max-width:760px;}
.article-content{
  font-size:17px;
  line-height:1.85;
  color:var(--ink-2);
  word-wrap:break-word;
}
.article-content > *:first-child{margin-top:0;}
.article-content p{margin:0 0 1.2em;}
.article-content h2{
  position:relative;
  font-size:clamp(22px,2.4vw,27px);
  font-weight:700;
  line-height:1.45;
  margin:44px 0 16px;
  padding-left:18px;
  color:var(--ink);
}
.article-content h2::before{
  content:"";position:absolute;left:0;top:.3em;bottom:.3em;width:4px;border-radius:2px;background:var(--brand);
}
.article-content h3{font-size:20px;font-weight:600;margin:32px 0 12px;color:var(--ink);}
.article-content h4{font-size:17px;font-weight:600;margin:24px 0 10px;color:var(--ink);}
.article-content ul,.article-content ol{margin:0 0 1.2em;padding-left:1.35em;}
.article-content li{margin:0 0 .5em;}
.article-content strong{color:var(--ink);font-weight:700;}
.article-content a{color:var(--brand);text-decoration:underline;text-underline-offset:3px;}
.article-content a:hover{color:var(--brand-dark);}
.article-content img{border-radius:12px;margin:26px auto;}
.article-content figure{margin:26px 0;}
.article-content figcaption,
.article-content .caption{
  font-size:13px;color:var(--muted-2);text-align:center;margin-top:10px;
}
.article-content blockquote{
  margin:26px 0;padding:18px 22px;
  background:var(--soft);
  border-left:3px solid var(--brand);
  border-radius:12px;
  color:#3D4147;font-size:16px;
}
.article-content blockquote p:last-child{margin-bottom:0;}
.article-content table{
  width:100%;border-collapse:collapse;font-size:15px;margin:26px 0;
}
.article-content th,.article-content td{
  padding:12px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;
}
.article-content th{font-weight:700;color:var(--ink);}
.article-content pre{
  background:#14161A;color:#E9E6E2;padding:18px;border-radius:12px;
  overflow-x:auto;font-family:var(--font-mono);font-size:14px;
}
.article-content code{
  font-family:var(--font-mono);font-size:.92em;background:var(--soft);
  border:1px solid var(--line);border-radius:6px;padding:1px 6px;
}

.empty-state{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--sh-sm);
  padding:56px 28px;
  text-align:center;
}
.empty-icon{
  width:60px;height:60px;border-radius:16px;margin:0 auto 18px;
  display:grid;place-items:center;
  background:var(--brand-soft);color:var(--brand);font-size:24px;
}
.empty-state h2{font-size:22px;font-weight:700;margin-bottom:10px;}
.empty-state p{color:var(--muted);font-size:15px;max-width:420px;margin:0 auto 22px;}

.back-row{margin:44px 0 0;padding-top:22px;border-top:1px solid var(--line);}
.back-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;font-weight:600;color:var(--muted);
}
.back-link:hover{color:var(--brand);}

/* ---------- related ---------- */
.related{padding:72px 0 0;}
.related-inner{max-width:820px;margin:0 auto;}
.section-title{
  font-size:20px;font-weight:700;margin-bottom:20px;
  display:flex;align-items:center;gap:12px;
}
.section-title::after{content:"";flex:1;height:1px;background:var(--line);}
.related-list{display:grid;gap:12px;}
.related-item{
  display:flex;align-items:center;gap:16px;
  padding:18px 20px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--sh-sm);
  transition:transform .2s var(--eas),box-shadow .2s var(--eas),border-color .2s var(--eas);
}
.related-item:hover{
  transform:translateY(-3px);
  box-shadow:var(--sh-md);
  border-color:var(--brand-line);
}
.related-title{
  flex:1;min-width:0;
  font-size:15.5px;font-weight:600;color:var(--ink);
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.related-time{font-size:13px;color:var(--muted-2);font-family:var(--font-mono);}

/* ---------- mini cta ---------- */
.mini-cta{margin-top:72px;}
.mini-cta-inner{
  background:#14161A;
  border-radius:var(--r-card);
  padding:22px 26px;
  min-height:96px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  box-shadow:var(--sh-lg);
}
.mini-title{color:#fff;font-size:16px;font-weight:700;margin-bottom:4px;}
.mini-sub{color:rgba(255,255,255,.58);font-size:12px;font-family:var(--font-mono);}
.mini-actions{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.mini-actions .btn{--bs-btn-padding-y:11px;--bs-btn-padding-x:20px;}
.mini-actions .btn-ghost{border-color:rgba(255,255,255,.32);color:#fff;}
.mini-actions .btn-ghost:hover{background:rgba(255,255,255,.1);color:#fff;border-color:rgba(255,255,255,.5);}

/* ---------- footer ---------- */
.site-footer{
  margin-top:96px;
  background:var(--soft);
  border-top:1px solid var(--line);
  padding:64px 0 28px;
  font-size:14px;
}
.footer-grid{display:grid;grid-template-columns:1.3fr 2fr .9fr;gap:40px;}
.footer-brand .brand{margin-bottom:14px;}
.footer-brand p{color:var(--muted);font-size:14px;line-height:1.7;max-width:300px;}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:12px;}
.footer-col a{
  display:block;padding:5px 0;color:var(--muted);font-size:14px;
  transition:color .16s var(--eas);
}
.footer-col a:hover{color:var(--brand);text-decoration:underline;text-underline-offset:3px;}
.footer-qr{justify-self:end;}
.qr-box{
  width:96px;height:96px;padding:10px;
  background:#fff;border:1px solid var(--line);border-radius:12px;
  display:grid;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr);gap:4px;
}
.qr-box span{border-radius:2px;background:transparent;}
.qr-box span.on{background:var(--ink);}
.footer-qr .cap{font-size:13px;color:var(--muted);margin-top:10px;}
.footer-contact{font-size:12.5px;color:var(--muted-2);margin-top:6px;font-family:var(--font-mono);line-height:1.7;}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted-2);
}
.footer-bottom a{color:var(--muted-2);}
.footer-bottom a:hover{color:var(--brand);}

/* ---------- drawer ---------- */
.drawer-backdrop{
  position:fixed;inset:0;background:rgba(20,22,26,.44);
  opacity:0;pointer-events:none;transition:opacity .24s var(--eas);z-index:1040;
}
.mobile-drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(340px,86vw);
  background:#fff;z-index:1050;padding:22px 20px;
  display:flex;flex-direction:column;gap:14px;overflow-y:auto;
  transform:translateX(104%);
  transition:transform .26s var(--eas);
  box-shadow:var(--sh-lg);
}
.drawer-open .mobile-drawer{transform:none;}
.drawer-open .drawer-backdrop{opacity:1;pointer-events:auto;}
.drawer-head{display:flex;align-items:center;justify-content:space-between;}
.drawer-title{font-size:15px;font-weight:700;}
.drawer-close{
  width:36px;height:36px;border-radius:10px;border:1px solid var(--line);
  background:#fff;color:var(--ink);font-size:18px;line-height:1;cursor:pointer;
}
.drawer-close:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}
.drawer-nav{display:flex;flex-direction:column;gap:2px;padding:8px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.drawer-nav a{
  padding:12px 10px;border-radius:10px;font-size:15px;font-weight:600;color:#3D4147;
}
.drawer-nav a:hover{background:var(--brand-soft);color:var(--brand);}
.drawer-nav a.active{color:var(--brand);background:var(--brand-soft);}
.drawer-search input{
  width:100%;height:48px;padding:0 14px;
  border:1px solid var(--line);border-radius:var(--r-input);
  font-size:14px;outline:0;background:#fff;
  transition:border-color .16s var(--eas),box-shadow .16s var(--eas);
}
.drawer-search input:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(244,87,30,.12);}
.drawer-cta{width:100%;display:flex;justify-content:center;}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--eas),transform .5s var(--eas);}
.reveal.in{opacity:1;transform:none;}

/* ---------- responsive ---------- */
@media (max-width:1199.98px){
  .command-search{width:200px;}
  .command-search:focus-within{width:260px;}
}
@media (max-width:991.98px){
  .header-inner{height:64px;}
  .main-nav{display:none;}
  .command-search{display:none;}
  .icon-btn{display:none;}
  .nav-toggle{display:grid;}
  .mobile-drawer,.drawer-backdrop{display:flex;}
  .mobile-drawer{display:flex;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-qr{justify-self:start;}
  .article-main{padding-top:56px;}
  .related{padding-top:56px;}
  .site-footer{margin-top:72px;padding-top:48px;}
  .mini-cta{margin-top:56px;}
}
@media (min-width:992px){
  .mobile-drawer,.drawer-backdrop{display:none;}
}
@media (max-width:767.98px){
  body{font-size:15.5px;}
  .brand-text{font-size:15px;}
  .article-hero{padding:36px 0 34px;}
  .breadcrumb-row{margin-bottom:16px;}
  .meta-row{gap:10px;font-size:13px;}
  .article-main{padding-top:44px;}
  .article-content{font-size:16px;line-height:1.8;}
  .related-item{flex-direction:column;align-items:flex-start;gap:8px;}
  .related-title{white-space:normal;}
  .mini-cta-inner{flex-direction:column;align-items:flex-start;padding:20px;}
  .mini-actions{width:100%;flex-direction:column;align-items:stretch;}
  .mini-actions .btn{width:100%;display:flex;justify-content:center;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-links{grid-template-columns:1fr 1fr;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}
@media (max-width:575.98px){
  .container{padding-left:16px;padding-right:16px;}
  .footer-links{grid-template-columns:1fr;}
  .article-content h2{padding-left:14px;}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  .reveal{opacity:1;transform:none;transition:none;}
  .btn,.related-item,.command-search,.main-nav .nav-link::after{transition:none;}
}

/* roulang page: category2 */
:root{
  --brand:#F4571E;
  --brand-dark:#D9450F;
  --brand-soft:rgba(244,87,30,.08);
  --brand-soft-2:rgba(244,87,30,.14);
  --ink:#14161A;
  --ink-2:#393E46;
  --muted:#6B7078;
  --bg:#F7F5F2;
  --surface:#FFFFFF;
  --surface-2:#FAF8F6;
  --line:rgba(20,22,26,.08);
  --line-2:rgba(20,22,26,.14);
  --accent:#12C9A8;
  --accent-soft:rgba(18,201,168,.12);
  --r-card:16px;
  --r-btn:10px;
  --r-input:12px;
  --r-pill:999px;
  --sh-sm:0 1px 2px rgba(20,22,26,.05);
  --sh-md:0 8px 24px -8px rgba(20,22,26,.14);
  --sh-lg:0 20px 48px -16px rgba(20,22,26,.18);
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-cn:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC","Segoe UI",sans-serif;
  --font-num:"Inter","SF Mono","JetBrains Mono",ui-monospace,"Menlo",monospace;
  --bs-primary:#F4571E;
  --bs-primary-rgb:244,87,30;
  --bs-body-bg:#F7F5F2;
  --bs-body-color:#14161A;
  --bs-border-color:rgba(20,22,26,.08);
  --bs-border-radius:10px;
  --bs-border-radius-lg:16px;
  --bs-link-color:#F4571E;
  --bs-link-hover-color:#D9450F;
  --bs-body-font-family:var(--font-cn);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:var(--brand);text-decoration:none;transition:color .18s var(--ease);}
a:hover{color:var(--brand-dark);}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;color:var(--ink);letter-spacing:-.01em;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
::selection{background:var(--brand-soft-2);}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 20px;
}
@media (min-width:1400px){.container{max-width:1280px;}}

/* ---------- 顶部命令栏 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:rgba(247,245,242,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s var(--ease);
}
.site-header.is-scrolled{box-shadow:var(--sh-md);}
.nav-row{
  display:flex;
  align-items:center;
  gap:24px;
  height:72px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
  color:var(--ink);
}
.brand:hover{color:var(--ink);}
.brand-mark{
  width:34px;height:34px;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--brand);
  color:#fff;
  border-radius:9px;
  font-family:var(--font-num);
  font-weight:700;
  font-size:17px;
  letter-spacing:0;
}
.brand-text{
  font-size:16px;
  font-weight:700;
  letter-spacing:-.01em;
  white-space:nowrap;
}
.brand-text em{font-style:normal;color:var(--brand);}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:8px;}
.main-nav .nav-link{
  position:relative;
  display:inline-block;
  padding:8px 12px;
  font-size:15px;
  font-weight:500;
  color:var(--ink-2);
  border-radius:8px;
  white-space:nowrap;
}
.main-nav .nav-link::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:2px;
  height:2px;
  background:var(--brand);
  border-radius:2px;
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s var(--ease);
}
.main-nav .nav-link:hover{color:var(--ink);background:var(--brand-soft);}
.main-nav .nav-link:hover::after,
.main-nav .nav-link.active::after{transform:scaleX(1);}
.main-nav .nav-link.active{color:var(--brand);font-weight:600;}
.nav-tools{display:flex;align-items:center;gap:12px;margin-left:auto;}
.command-search{
  position:relative;
  display:flex;
  align-items:center;
  width:240px;
  height:40px;
  padding:0 10px;
  background:var(--surface);
  border:1px solid var(--line-2);
  border-radius:var(--r-input);
  transition:width .22s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.command-search:focus-within{
  width:320px;
  border-color:var(--brand);
  box-shadow:0 0 0 3px var(--brand-soft);
}
.command-search svg{flex-shrink:0;color:var(--muted);}
.command-search input{
  flex:1;
  min-width:0;
  height:100%;
  border:0;
  outline:0;
  background:transparent;
  font-size:14px;
  color:var(--ink);
  padding:0 8px;
}
.command-search input::placeholder{color:#9AA0A6;}
.kbd{
  flex-shrink:0;
  font-family:var(--font-num);
  font-size:11px;
  color:var(--muted);
  background:var(--surface-2);
  border:1px solid var(--line);
  border-radius:6px;
  padding:2px 6px;
  white-space:nowrap;
}
.icon-btn{
  width:40px;height:40px;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--surface);
  border:1px solid var(--line-2);
  border-radius:var(--r-input);
  color:var(--ink-2);
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.icon-btn:hover{border-color:var(--brand);color:var(--brand);}
.icon-btn:active{transform:translateY(1px);}
.nav-toggle{
  display:none;
  width:40px;height:40px;
  align-items:center;justify-content:center;
  background:var(--surface);
  border:1px solid var(--line-2);
  border-radius:var(--r-input);
  cursor:pointer;
  color:var(--ink);
}
.nav-toggle span{
  display:block;width:16px;height:2px;background:currentColor;border-radius:2px;position:relative;
}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;border-radius:2px;
}
.nav-toggle span::before{top:-5px;}
.nav-toggle span::after{top:5px;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  font-size:15px;
  font-weight:600;
  border-radius:var(--r-btn);
  border:1px solid transparent;
  cursor:pointer;
  text-align:center;
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background-color .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease);
}
.btn-primary,
.btn-primary:focus{
  background:var(--brand);
  color:#fff;
  box-shadow:var(--sh-md);
}
.btn-primary:hover{
  background:var(--brand-dark);
  color:#fff;
  transform:translateY(-2px);
  box-shadow:var(--sh-lg);
}
.btn-primary:active{transform:translateY(0);box-shadow:var(--sh-sm);}
.btn-ghost{
  background:transparent;
  color:var(--brand);
  border-color:var(--brand);
}
.btn-ghost:hover{
  background:var(--brand-soft);
  color:var(--brand-dark);
  border-color:var(--brand-dark);
  transform:translateY(-2px);
}
.btn-ghost:active{transform:translateY(0);}
.btn-light{
  background:#fff;
  color:var(--ink);
  border-color:var(--line-2);
}
.btn-light:hover{background:var(--surface-2);color:var(--ink);transform:translateY(-2px);}
.btn:focus-visible,.icon-btn:focus-visible,.nav-toggle:focus-visible,a:focus-visible{
  outline:2px solid var(--brand);
  outline-offset:2px;
}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}
.btn-block{width:100%;}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;}

/* ---------- 面包屑 ---------- */
.crumbs{
  padding:22px 0 0;
  font-size:13px;
  color:var(--muted);
}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:6px;}
.crumbs a{color:var(--muted);}
.crumbs a:hover{color:var(--brand);}
.crumbs .sep{color:#C6C9CD;font-weight:300;}
.crumbs .current{color:var(--ink);font-weight:600;}

/* ---------- 通用板块 ---------- */
.section{padding:96px 0;}
.section-sm{padding:64px 0;}
.section-alt{background:var(--surface-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:720px;margin-bottom:40px;}
.section-head.split{
  max-width:none;
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--brand);
  font-weight:600;
  margin-bottom:14px;
}
.eyebrow::before{
  content:"";
  width:18px;height:2px;background:var(--brand);border-radius:2px;
}
h1.page-title{
  font-size:clamp(32px,5vw,52px);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.16;
}
h2.section-title{
  font-size:clamp(26px,3.4vw,36px);
  font-weight:700;
  letter-spacing:-.015em;
  line-height:1.24;
}
h3.card-title{font-size:20px;font-weight:600;line-height:1.4;}
.lede{
  margin-top:16px;
  font-size:17px;
  color:var(--ink-2);
  line-height:1.8;
  max-width:660px;
}
.text-muted-2{color:var(--muted);font-size:14px;}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;}

/* ---------- Hero ---------- */
.hero{padding:36px 0 0;}
.hero-grid{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:48px;
  align-items:center;
}
.hero-copy .lede{font-size:18px;}
.hero-actions{margin-top:32px;}
.trust-bar{
  margin-top:52px;
  padding-top:20px;
  border-top:1px solid var(--line-2);
  display:flex;
  flex-wrap:wrap;
  gap:12px 48px;
}
.trust-item{display:flex;flex-direction:column;gap:2px;}
.trust-item .k{font-size:12px;color:var(--muted);letter-spacing:.04em;}
.trust-item .v{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:15px;
  font-weight:600;
  color:var(--ink);
}
.hero-media{position:relative;}
.device-frame{
  position:relative;
  border-radius:20px;
  overflow:hidden;
  box-shadow:var(--sh-lg);
  border:1px solid var(--line);
  background:var(--surface);
}
.device-frame img{
  width:100%;
  aspect-ratio:16/11;
  object-fit:cover;
}
.device-frame::after{
  content:"";
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(20,22,26,0) 40%,rgba(20,22,26,.42) 100%);
  pointer-events:none;
}
.spec-float{
  position:absolute;
  left:-16px;
  bottom:24px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--sh-md);
  padding:14px 18px;
  display:flex;
  flex-direction:column;
  gap:2px;
}
.spec-float .lab{font-size:12px;color:var(--muted);}
.spec-float .val{font-family:var(--font-num);font-size:18px;font-weight:700;}
.spec-float.alt{
  left:auto;right:-14px;bottom:auto;top:28px;
}
.spec-float.alt .val{color:var(--accent);}

/* ---------- 规格双栏 ---------- */
.spec-duo{
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:32px;
  align-items:start;
}
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--sh-sm);
  padding:24px;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),border-color .24s var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--sh-md);border-color:var(--line-2);}
.spec-list{padding:8px 0;}
.spec-row{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:20px;
  padding:14px 0;
  border-bottom:1px solid var(--line);
}
.spec-row:last-child{border-bottom:0;}
.spec-key{font-size:15px;color:var(--ink-2);}
.spec-val{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:15px;
  font-weight:600;
  text-align:right;
  white-space:nowrap;
}
.spec-val em{font-style:normal;color:var(--brand);}
.download-panel{
  position:sticky;
  top:96px;
  background:var(--ink);
  color:#fff;
  border-radius:var(--r-card);
  padding:28px;
  box-shadow:var(--sh-lg);
}
.download-panel h3{color:#fff;font-size:20px;font-weight:700;}
.download-panel p{color:rgba(255,255,255,.7);font-size:14px;margin-top:8px;}
.download-panel .btn-primary{box-shadow:none;}
.download-panel .btn-primary:hover{box-shadow:0 12px 28px -12px rgba(0,0,0,.6);}
.download-panel .btn-outline-light-2{
  display:inline-flex;align-items:center;justify-content:center;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  background:transparent;border:1px solid rgba(255,255,255,.35);
  color:#fff;font-weight:600;font-size:15px;
  transition:background-color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.download-panel .btn-outline-light-2:hover{
  background:rgba(255,255,255,.1);border-color:#fff;color:#fff;transform:translateY(-2px);
}
.qr-wrap{
  margin-top:24px;
  padding-top:24px;
  border-top:1px solid rgba(255,255,255,.14);
  display:flex;
  align-items:center;
  gap:18px;
}
.qr-box{
  width:96px;height:96px;
  background:#fff;
  border-radius:12px;
  padding:8px;
  display:grid;
  grid-template-columns:repeat(5,1fr);
  grid-template-rows:repeat(5,1fr);
  gap:3px;
  flex-shrink:0;
}
.qr-box span{background:rgba(20,22,26,.12);border-radius:2px;}
.qr-box span.on{background:var(--ink);}
.qr-note{font-size:13px;color:rgba(255,255,255,.72);line-height:1.7;}

/* ---------- 平台卡（2×2） ---------- */
.platform-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:24px;
}
.platform-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--sh-sm);
  padding:24px;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease);
}
.platform-card:hover{transform:translateY(-4px);box-shadow:var(--sh-md);}
.platform-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}
.platform-top h3{font-size:19px;font-weight:700;}
.badge{
  display:inline-flex;
  align-items:center;
  height:24px;
  padding:0 10px;
  border-radius:var(--r-pill);
  font-size:12px;
  font-weight:600;
  background:var(--brand-soft);
  color:var(--brand);
  white-space:nowrap;
}
.badge-accent{background:var(--accent-soft);color:#0B9E84;}
.platform-rows{padding-top:6px;}
.platform-rows .spec-row{padding:12px 0;}
.platform-rows .spec-key{font-size:14px;}
.platform-rows .spec-val{font-size:14px;}

/* ---------- 截图条 ---------- */
.shot-strip{
  display:flex;
  gap:20px;
  overflow-x:auto;
  padding:8px 4px 24px;
  scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;
}
.shot-strip::-webkit-scrollbar{height:6px;}
.shot-strip::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:6px;}
.shot-card{
  flex:0 0 320px;
  scroll-snap-align:start;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--sh-sm);
  overflow:hidden;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease);
}
.shot-card:hover{transform:translateY(-4px);box-shadow:var(--sh-md);}
.shot-card img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  transition:transform .28s var(--ease);
}
.shot-card:hover img{transform:scale(1.03);}
.shot-body{padding:18px 20px 22px;}
.shot-body h3{font-size:16px;font-weight:600;margin-bottom:6px;}
.shot-body p{font-size:14px;color:var(--muted);line-height:1.7;}

/* ---------- 步骤 ---------- */
.steps{display:grid;gap:0;max-width:860px;}
.step{
  display:grid;
  grid-template-columns:96px 1fr;
  gap:24px;
  padding:28px 0;
  border-bottom:1px solid var(--line);
}
.step:last-child{border-bottom:0;}
.step-no{
  font-family:var(--font-num);
  font-size:34px;
  font-weight:700;
  color:var(--brand);
  line-height:1;
  letter-spacing:-.02em;
}
.step h3{font-size:19px;font-weight:600;margin-bottom:8px;}
.step p{color:var(--ink-2);font-size:15.5px;line-height:1.8;max-width:640px;}
.step .hint{
  display:inline-flex;
  margin-top:12px;
  font-size:13px;
  color:var(--muted);
  background:var(--surface-2);
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  padding:4px 12px;
}

/* ---------- FAQ ---------- */
.faq{max-width:820px;}
.faq-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  margin-bottom:12px;
  overflow:hidden;
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.faq-item[open]{border-color:var(--line-2);box-shadow:var(--sh-sm);}
.faq-item summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:64px;
  padding:14px 22px;
  cursor:pointer;
  font-size:16px;
  font-weight:600;
  list-style:none;
  color:var(--ink);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary:hover{color:var(--brand);}
.plus{
  position:relative;
  width:16px;height:16px;
  flex-shrink:0;
  transition:transform .22s var(--ease);
}
.plus::before,.plus::after{
  content:"";
  position:absolute;
  background:var(--brand);
  border-radius:2px;
  left:50%;top:50%;
}
.plus::before{width:14px;height:2px;transform:translate(-50%,-50%);}
.plus::after{width:2px;height:14px;transform:translate(-50%,-50%);}
.faq-item[open] .plus{transform:rotate(45deg);}
.faq-body{
  background:var(--surface-2);
  margin:0 12px 12px;
  border-radius:12px;
  padding:20px;
  font-size:15.5px;
  line-height:1.85;
  color:var(--ink-2);
}

/* ---------- CTA 带 ---------- */
.cta-band{
  background:var(--ink);
  color:#fff;
  padding:56px 0;
}
.cta-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:40px;
}
.cta-inner h2{color:#fff;font-size:clamp(24px,3vw,32px);font-weight:700;}
.cta-inner p{color:rgba(255,255,255,.7);margin-top:10px;font-size:15px;}
.cta-note{
  font-family:var(--font-num);
  font-size:12px;
  color:rgba(255,255,255,.6);
  margin-top:14px;
}
.cta-right{display:flex;align-items:center;gap:24px;flex-shrink:0;}
.cta-right .qr-box{width:84px;height:84px;}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--surface-2);
  border-top:1px solid var(--line);
  padding:64px 0 28px;
  font-size:14px;
}
.footer-grid{
  display:grid;
  grid-template-columns:4fr 6fr 2fr;
  gap:40px;
}
.footer-brand .brand{margin-bottom:16px;}
.footer-brand p{color:var(--muted);line-height:1.8;max-width:300px;}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.footer-col h4{
  font-size:14px;
  font-weight:700;
  margin-bottom:14px;
  color:var(--ink);
}
.footer-col a{
  display:block;
  color:var(--muted);
  padding:5px 0;
}
.footer-col a:hover{
  color:var(--brand);
  text-decoration:underline;
  text-underline-offset:3px;
}
.footer-qr .qr-box{
  width:104px;height:104px;
  background:#fff;
  border:1px solid var(--line);
  padding:8px;
}
.footer-qr .cap{font-size:13px;color:var(--muted);margin-top:12px;}
.footer-contact{
  font-family:var(--font-num);
  font-size:13px;
  color:var(--muted);
  line-height:1.8;
  margin-top:8px;
}
.footer-bottom{
  margin-top:48px;
  padding-top:20px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  gap:10px 24px;
  justify-content:space-between;
  color:var(--muted);
  font-size:13px;
}
.footer-bottom a{color:var(--muted);}
.footer-bottom a:hover{color:var(--brand);text-decoration:underline;text-underline-offset:3px;}

/* ---------- 移动抽屉 ---------- */
.drawer-mask{
  position:fixed;
  inset:0;
  background:rgba(20,22,26,.42);
  opacity:0;
  visibility:hidden;
  transition:opacity .22s var(--ease),visibility .22s var(--ease);
  z-index:1100;
}
.drawer-mask.show{opacity:1;visibility:visible;}
.drawer{
  position:fixed;
  top:0;right:0;
  width:min(320px,86vw);
  height:100%;
  background:var(--surface);
  box-shadow:var(--sh-lg);
  transform:translateX(102%);
  transition:transform .26s var(--ease);
  z-index:1200;
  padding:24px 20px;
  display:flex;
  flex-direction:column;
  gap:18px;
  overflow-y:auto;
}
.drawer.show{transform:translateX(0);}
.drawer .drawer-link{
  display:block;
  padding:12px 4px;
  font-size:16px;
  font-weight:600;
  color:var(--ink);
  border-bottom:1px solid var(--line);
}
.drawer .drawer-link.active{color:var(--brand);}
.drawer .command-search{width:100%;}
.drawer .command-search:focus-within{width:100%;}
.drawer .btn,.drawer .btn-outline-light-2{width:100%;}
.drawer-close{
  align-self:flex-end;
  width:36px;height:36px;
  border-radius:10px;
  border:1px solid var(--line-2);
  background:var(--surface);
  color:var(--ink);
  cursor:pointer;
  font-size:18px;
  line-height:1;
}

/* ---------- 入场动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.reveal.in{opacity:1;transform:none;}

@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none;}
  *{animation:none !important;transition-duration:.001s !important;}
}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .command-search{width:200px;}
  .command-search:focus-within{width:240px;}
}
@media (max-width:991px){
  .main-nav,.nav-tools .command-search,.nav-tools .icon-btn,.nav-tools .btn{display:none;}
  .nav-toggle{display:inline-flex;}
  .hero-grid{grid-template-columns:1fr;gap:32px;}
  .spec-duo{grid-template-columns:1fr;gap:24px;}
  .download-panel{position:static;}
  .cta-inner{flex-direction:column;align-items:flex-start;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-qr{grid-column:span 2;}
}
@media (max-width:767px){
  .nav-row{height:64px;gap:12px;}
  .section{padding:56px 0;}
  .section-sm{padding:44px 0;}
  .section-head.split{flex-direction:column;align-items:flex-start;gap:16px;}
  .platform-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-links{grid-template-columns:1fr 1fr;}
  .footer-qr{grid-column:auto;}
  .step{grid-template-columns:1fr;gap:12px;}
  .step-no{font-size:26px;}
  .spec-float{left:12px;bottom:12px;padding:10px 14px;}
  .spec-float.alt{right:12px;top:12px;bottom:auto;}
  .hero-actions .btn{width:100%;}
  .btn-row{flex-direction:column;}
  .btn-row .btn{width:100%;}
}
@media (max-width:519px){
  body{font-size:15.5px;}
  h1.page-title{font-size:clamp(26px,7.6vw,34px);}
  .lede{font-size:16px;}
  .shot-card{flex:0 0 82%;}
  .trust-bar{gap:16px 28px;}
  .download-panel{padding:22px;}
  .card{padding:20px;}
  .faq-item summary{padding:12px 16px;font-size:15px;}
}

/* roulang page: category3 */
:root{
  --brand:#F4571E;
  --brand-strong:#D9450F;
  --brand-soft:rgba(244,87,30,.08);
  --accent:#12C9A8;
  --accent-soft:rgba(18,201,168,.12);
  --ink:#14161A;
  --ink-2:#3A3F47;
  --muted:#71767E;
  --bg:#F7F5F2;
  --surface:#FFFFFF;
  --surface-2:#FAF8F6;
  --line:rgba(20,22,26,.08);
  --line-strong:rgba(20,22,26,.14);
  --r-card:16px;
  --r-btn:10px;
  --r-input:12px;
  --r-img:14px;
  --sh-sm:0 1px 2px rgba(20,22,26,.05);
  --sh-md:0 8px 24px -8px rgba(20,22,26,.14);
  --sh-lg:0 20px 48px -16px rgba(20,22,26,.18);
  --ease:cubic-bezier(.2,.8,.2,1);
  --mono:"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;

  --bs-primary:#F4571E;
  --bs-body-font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans","Microsoft YaHei","Noto Sans SC",sans-serif;
  --bs-body-color:#14161A;
  --bs-border-radius:16px;
  --bs-border-radius-lg:16px;
  --bs-link-color:#14161A;
  --bs-link-hover-color:#D9450F;
  --bs-gutter-x:24px;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--bs-body-font-family);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:var(--ink);text-decoration:none;transition:color .16s var(--ease);}
a:hover{color:var(--brand-strong);}
button{font:inherit;color:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;color:var(--ink);letter-spacing:-.01em;}
p{margin:0;}
input,select,textarea{font:inherit;color:inherit;}

.container{max-width:1200px;padding-inline:20px;}
@media (min-width:1400px){.container{max-width:1280px;}}

/* ---------- 通用 ---------- */
.section{padding:96px 0;}
.section-sm{padding:64px 0;}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;flex-wrap:wrap;}
.sec-head h2{font-size:clamp(24px,3vw,34px);font-weight:700;}
.sec-head p{color:var(--muted);font-size:14.5px;margin-top:10px;max-width:560px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--brand);
  background:var(--brand-soft);border-radius:999px;padding:6px 14px;
  letter-spacing:.02em;
}
.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);}
.badge-soft{
  display:inline-flex;align-items:center;
  font-size:12.5px;font-weight:600;padding:4px 12px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand);
}
.badge-accent{background:var(--accent-soft);color:#0C8C76;}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em;}

/* ---------- 头部与导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:1030;
  background:rgba(247,245,242,.92);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s var(--ease),background .2s var(--ease);
}
.site-header.scrolled{box-shadow:var(--sh-md);background:rgba(247,245,242,.98);}
.header-inner{display:flex;align-items:center;gap:24px;height:72px;}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.brand-mark{
  width:34px;height:34px;border-radius:11px;
  background:var(--ink);color:#fff;
  display:grid;place-items:center;
  font-weight:800;font-size:16px;letter-spacing:-.02em;
}
.brand-text{font-size:16px;font-weight:700;letter-spacing:-.01em;white-space:nowrap;}
.brand-text em{font-style:normal;color:var(--brand);}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:8px;}
.nav-link{
  position:relative;padding:8px 14px;border-radius:9px;
  font-size:14.5px;font-weight:600;color:var(--ink-2);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:0;height:2px;
  background:var(--brand);border-radius:2px;
  transform:scaleX(0);transform-origin:left center;
  transition:transform .18s var(--ease);
}
.nav-link:hover{color:var(--ink);background:rgba(20,22,26,.04);}
.nav-link:hover::after{transform:scaleX(1);}
.nav-link.active{color:var(--brand);}
.nav-link.active::after{transform:scaleX(1);}
.header-tools{display:flex;align-items:center;gap:10px;margin-left:auto;}
.command-search{
  position:relative;display:flex;align-items:center;
  width:240px;height:42px;border-radius:12px;
  background:var(--surface);border:1px solid var(--line);
  transition:width .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.command-search svg{position:absolute;left:12px;width:16px;height:16px;stroke:var(--muted);fill:none;stroke-width:1.8;}
.command-search input{
  width:100%;height:100%;border:0;background:transparent;
  padding:0 58px 0 36px;font-size:14px;outline:none;
}
.command-search input::placeholder{color:#A2A6AD;}
.command-search .kbd{
  position:absolute;right:8px;font-size:11px;font-family:var(--mono);
  color:var(--muted);background:var(--surface-2);
  border:1px solid var(--line);border-radius:6px;padding:2px 6px;
}
.command-search:focus-within{
  width:320px;border-color:var(--brand);
  box-shadow:0 0 0 2px rgba(244,87,30,.35);
}
.icon-btn{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:var(--surface);border:1px solid var(--line);color:var(--ink-2);
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),color .16s var(--ease);
}
.icon-btn:hover{color:var(--brand);box-shadow:var(--sh-sm);transform:translateY(-1px);}
.icon-btn svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.8;}

.btn-main{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);border:1px solid transparent;
  background:var(--brand);color:#fff;font-size:15px;font-weight:600;
  cursor:pointer;white-space:nowrap;
  box-shadow:var(--sh-sm);
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),filter .16s var(--ease),background .16s var(--ease);
}
.btn-main:hover{background:var(--brand-strong);color:#fff;filter:brightness(1.06);transform:translateY(-2px);box-shadow:var(--sh-lg);}
.btn-main:active{transform:translateY(0);}
.btn-main.small{height:42px;padding:0 18px;font-size:14px;}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 24px;border-radius:var(--r-btn);
  border:1px solid var(--brand);color:var(--brand);background:transparent;
  font-size:15px;font-weight:600;cursor:pointer;white-space:nowrap;
  transition:background .16s var(--ease),transform .16s var(--ease),box-shadow .16s var(--ease);
}
.btn-ghost:hover{background:var(--brand-soft);color:var(--brand-strong);transform:translateY(-2px);}
.btn-ghost.on-dark{border-color:rgba(255,255,255,.4);color:#fff;}
.btn-ghost.on-dark:hover{background:rgba(255,255,255,.12);color:#fff;}
.btn-main:focus-visible,.btn-ghost:focus-visible,.nav-link:focus-visible,.icon-btn:focus-visible,.faq-q:focus-visible{
  outline:2px solid var(--brand);outline-offset:2px;
}
.hamburger{
  display:none;width:42px;height:42px;border-radius:12px;background:var(--surface);
  border:1px solid var(--line);cursor:pointer;place-items:center;
}
.hamburger span{display:block;width:18px;height:2px;background:var(--ink);border-radius:2px;margin:3px auto;}

.mobile-drawer{
  display:none;border-top:1px solid var(--line);background:var(--surface);
  padding:16px 20px 22px;
}
.mobile-drawer.open{display:block;}
.mobile-drawer .nav-link{display:block;padding:12px 10px;border-radius:10px;font-size:15px;}
.mobile-drawer .nav-link::after{display:none;}
.mobile-drawer .nav-link.active{background:var(--brand-soft);}
.mobile-drawer .command-search{width:100%;margin:12px 0;}
.mobile-drawer .command-search:focus-within{width:100%;}
.mobile-drawer .btn-main{width:100%;margin-top:6px;}

/* ---------- 面包屑 ---------- */
.crumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);padding:22px 0 0;flex-wrap:wrap;}
.crumb a{color:var(--muted);}
.crumb a:hover{color:var(--brand);}
.crumb .sep{color:#B9BDC3;}
.crumb .current{color:var(--ink-2);max-width:340px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

/* ---------- Hero ---------- */
.page-hero{padding:28px 0 64px;}
.hero-copy h1{
  font-size:clamp(30px,4.4vw,48px);font-weight:800;letter-spacing:-.02em;line-height:1.18;
  margin:18px 0 16px;
}
.hero-sub{font-size:16.5px;color:var(--ink-2);max-width:460px;}
.hero-actions{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap;}
.hero-stats{
  display:flex;gap:32px;flex-wrap:wrap;
  margin-top:36px;padding-top:20px;border-top:1px solid var(--line);
}
.hero-stats div{font-size:13px;color:var(--muted);}
.hero-stats b{display:block;font-family:var(--mono);font-size:19px;color:var(--ink);font-weight:600;letter-spacing:-.02em;}
.hero-visual{position:relative;}
.hero-visual img{
  width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:var(--r-img);
  box-shadow:var(--sh-lg);
}
.hero-visual .float-card{
  position:absolute;left:-18px;bottom:26px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--sh-md);
  padding:14px 18px;font-size:13px;color:var(--muted);
}
.hero-visual .float-card b{display:block;font-family:var(--mono);color:var(--ink);font-size:14px;}

/* ---------- 卡片 ---------- */
.card-x{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-sm);padding:24px;height:100%;
  display:flex;flex-direction:column;gap:12px;
  transition:transform .24s var(--ease),box-shadow .24s var(--ease),border-color .24s var(--ease);
}
.card-x:hover{transform:translateY(-4px);box-shadow:var(--sh-md);border-color:var(--line-strong);}
.card-x h3{font-size:18px;font-weight:600;}
.card-x p{font-size:14.5px;color:var(--muted);}
.card-media{
  border-radius:var(--r-img);overflow:hidden;background:var(--surface-2);
}
.card-media img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .24s var(--ease);}
.card-x:hover .card-media img{transform:scale(1.03);}
.card-link{font-size:14px;font-weight:600;color:var(--brand);margin-top:auto;}
.big-card{padding:28px;}
.big-card h3{font-size:22px;}
.big-card p{font-size:15px;max-width:60ch;}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:12px;}
.faq-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-sm);overflow:hidden;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.faq-item.open{border-color:rgba(244,87,30,.35);box-shadow:var(--sh-md);}
.faq-q{
  width:100%;min-height:64px;display:flex;align-items:center;gap:16px;
  background:transparent;border:0;cursor:pointer;text-align:left;
  padding:0 22px;font-size:16px;font-weight:600;
}
.faq-q .num{font-family:var(--mono);font-size:13px;color:var(--brand);font-weight:600;flex:0 0 auto;}
.faq-q .plus{
  margin-left:auto;position:relative;width:16px;height:16px;flex:0 0 auto;
  transition:transform .2s var(--ease);
}
.faq-q .plus::before,.faq-q .plus::after{
  content:"";position:absolute;background:var(--brand);border-radius:2px;
}
.faq-q .plus::before{left:0;top:7px;width:16px;height:2px;}
.faq-q .plus::after{top:0;left:7px;width:2px;height:16px;}
.faq-item.open .faq-q .plus{transform:rotate(45deg);}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .24s var(--ease);}
.faq-item.open .faq-a{grid-template-rows:1fr;}
.faq-a>div{overflow:hidden;}
.faq-a .inner{
  background:var(--surface-2);margin:0 16px 16px;border-radius:12px;padding:20px;
  font-size:15px;color:var(--ink-2);line-height:1.8;
}
.faq-a .inner ul{margin-top:10px;display:flex;flex-direction:column;gap:6px;}
.faq-a .inner li{padding-left:16px;position:relative;font-size:14.5px;color:var(--ink-2);}
.faq-a .inner li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:1px;background:var(--brand);}

/* ---------- 时间线 ---------- */
.timeline{position:relative;padding-left:28px;}
.timeline::before{content:"";position:absolute;left:5px;top:6px;bottom:6px;width:1px;background:var(--line-strong);}
.tl-item{position:relative;padding-bottom:28px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-28px;top:6px;width:11px;height:11px;border-radius:50%;
  background:var(--surface);border:2px solid var(--brand);
}
.tl-date{font-family:var(--mono);font-size:13px;color:var(--brand);font-weight:600;}
.tl-item h3{font-size:16.5px;font-weight:600;margin:6px 0 6px;}
.tl-item p{font-size:14.5px;color:var(--muted);}
.tl-tag{display:inline-block;font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;background:var(--accent-soft);color:#0C8C76;margin-left:8px;}

/* ---------- 表单 ---------- */
.form-panel{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-md);padding:28px;
}
.field{margin-bottom:18px;}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:8px;}
.field .hint{font-size:12.5px;color:var(--muted);font-weight:400;margin-left:6px;}
.form-control,.form-select{
  width:100%;height:48px;border-radius:var(--r-input);border:1px solid var(--line-strong);
  background:var(--surface);padding:0 14px;font-size:15px;outline:none;
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
textarea.form-control{height:auto;min-height:128px;padding:12px 14px;line-height:1.7;resize:vertical;}
.form-control:focus,.form-select:focus{
  border-color:var(--brand);box-shadow:0 0 0 4px rgba(244,87,30,.12);
}
.form-note{font-size:12.5px;color:var(--muted);margin-top:6px;}

/* ---------- CTA 下载带 ---------- */
.dl-band{
  background:#14161A;color:#fff;border-radius:20px;padding:40px;
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.dl-band h2{color:#fff;font-size:clamp(22px,2.6vw,30px);font-weight:700;letter-spacing:-.02em;}
.dl-band .sub{color:rgba(255,255,255,.62);font-size:13px;margin-top:10px;}
.dl-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px;}
.dl-band .btn-main{background:var(--brand);}
.dl-band .btn-outline-light{
  display:inline-flex;align-items:center;height:48px;padding:0 24px;border-radius:var(--r-btn);
  border:1px solid rgba(255,255,255,.35);color:#fff;font-weight:600;font-size:15px;
  transition:background .16s var(--ease),transform .16s var(--ease);
}
.dl-band .btn-outline-light:hover{background:rgba(255,255,255,.12);color:#fff;transform:translateY(-2px);}
.qr-card{background:#fff;border-radius:12px;padding:14px;text-align:center;}
.qr-card .qr-box{display:grid;grid-template-columns:repeat(5,9px);gap:4px;justify-content:center;}
.qr-card .qr-box span{width:9px;height:9px;background:#EDEAE6;border-radius:2px;}
.qr-card .qr-box span.on{background:#14161A;}
.qr-card .cap{font-size:12px;color:#5C6169;margin-top:10px;}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--surface-2);border-top:1px solid var(--line);padding:64px 0 24px;margin-top:64px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 2fr 1fr;gap:40px;}
.footer-brand p{font-size:14px;color:var(--muted);margin-top:14px;max-width:320px;line-height:1.7;}
.footer-links{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:14px;}
.footer-col a{display:block;font-size:14px;color:var(--muted);padding:5px 0;}
.footer-col a:hover{color:var(--brand);text-decoration:underline;text-underline-offset:3px;}
.footer-qr{text-align:center;}
.footer-qr .qr-box{
  display:inline-grid;grid-template-columns:repeat(5,9px);gap:4px;background:#fff;
  border:1px solid var(--line);border-radius:12px;padding:12px;
}
.footer-qr .qr-box span{width:9px;height:9px;background:#EDEAE6;border-radius:2px;}
.footer-qr .qr-box span.on{background:#14161A;}
.footer-qr .cap{font-size:12.5px;color:var(--muted);margin-top:10px;}
.footer-contact{font-size:12.5px;color:var(--muted);font-family:var(--mono);margin-top:8px;line-height:1.7;}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
}
.footer-bottom a{color:var(--muted);}
.footer-bottom a:hover{color:var(--brand);}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
.reveal.in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .main-nav{display:none;}
  .command-search{width:200px;}
  .command-search:focus-within{width:260px;}
  .hamburger{display:grid;}
  .hero-visual .float-card{left:12px;}
}
@media (max-width:991px){
  .section{padding:64px 0;}
  .header-inner{height:64px;}
  .icon-btn{display:none;}
  .hero-copy h1{margin-top:14px;}
  .hero-stats{gap:22px;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .footer-qr{text-align:left;}
  .dl-band{padding:28px;}
}
@media (max-width:767px){
  .command-search{display:none;}
  .header-tools .btn-main{display:none;}
  .hero-visual img{aspect-ratio:16/12;}
  .footer-grid{grid-template-columns:1fr;gap:32px;}
  .footer-links{grid-template-columns:1fr 1fr;}
  .form-panel{padding:20px;}
  .card-x{padding:20px;}
  .faq-q{padding:0 16px;font-size:15px;}
  .faq-a .inner{margin:0 12px 14px;padding:16px;}
}
@media (max-width:520px){
  body{font-size:15.5px;}
  .container{padding-inline:16px;}
  .hero-actions .btn-main,.hero-actions .btn-ghost{width:100%;}
  .dl-actions .btn-main,.dl-actions .btn-outline-light{width:100%;justify-content:center;}
  .footer-links{grid-template-columns:1fr;}
  .sec-head{margin-bottom:24px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;}
  .reveal{opacity:1;transform:none;}
  html{scroll-behavior:auto;}
}