/* roulang page: index */
:root{
  --paper:#F7F5F1;
  --paper-2:#FFFFFF;
  --ink:#14161A;
  --ink-2:#2A2E36;
  --line:#E4DFD7;
  --accent:#FF4B1F;
  --accent-2:#0F7A6B;
  --muted:#6E7076;
  --r:2px;
  --t:200ms cubic-bezier(.22,.61,.36,1);
  --shadow-hover:0 12px 32px rgba(20,22,26,.08);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:120px}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  font-size:16.5px;line-height:1.95;font-weight:400;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
table{border-collapse:collapse;width:100%}
.num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}

.container{width:100%;max-width:1280px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 24px}}
@media(min-width:1024px){.container{padding:0 40px}}

/* ============ HEADER ============ */
.site-header{position:sticky;top:0;z-index:60}
.brand-bar{background:var(--ink);color:#fff;border-bottom:1px solid rgba(255,255,255,.08)}
.brand-inner{display:flex;align-items:center;gap:28px;min-height:68px}
.logo{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.logo-mark{
  width:30px;height:30px;border-radius:var(--r);background:var(--accent);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  font-weight:800;font-size:16px;letter-spacing:-.02em;
}
.logo-text{font-size:17px;font-weight:800;letter-spacing:-.01em;white-space:nowrap}
.main-nav{display:none;align-items:center;gap:26px;margin-left:auto}
@media(min-width:1024px){.main-nav{display:flex}}
.nav-link{
  position:relative;font-size:14.5px;font-weight:600;color:rgba(255,255,255,.72);
  padding:6px 0;transition:color var(--t);
}
.nav-link::after{
  content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--accent);
  transition:width var(--t);
}
.nav-link:hover{color:#fff}
.nav-link:hover::after,.nav-link.is-active::after{width:100%}
.nav-link.is-active{color:#fff}
.brand-actions{display:flex;align-items:center;gap:14px;margin-left:auto}
@media(min-width:1024px){.brand-actions{margin-left:0}}
.link-quiet{
  display:none;font-size:14px;font-weight:600;color:rgba(255,255,255,.68);
  position:relative;transition:color var(--t);
}
@media(min-width:900px){.link-quiet{display:inline-block}}
.link-quiet::after{
  content:"";position:absolute;left:0;bottom:-3px;height:1px;width:0;background:var(--accent);
  transition:width var(--t);
}
.link-quiet:hover{color:#fff}
.link-quiet:hover::after{width:100%}
.menu-toggle{
  display:inline-flex;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;border:1px solid rgba(255,255,255,.22);border-radius:var(--r);
  padding:0 10px;transition:border-color var(--t),background var(--t);
}
.menu-toggle span{display:block;height:2px;background:#fff;transition:transform var(--t),opacity var(--t)}
.menu-toggle:hover{border-color:var(--accent);background:rgba(255,75,31,.12)}
@media(min-width:1024px){.menu-toggle{display:none}}
.menu-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.menu-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mobile-menu{display:none;background:var(--ink-2);border-top:1px solid rgba(255,255,255,.08)}
.mobile-menu.is-open{display:block}
.mobile-menu ul{padding:10px 0 18px}
.mobile-menu a{
  display:block;padding:12px 0;font-size:15px;font-weight:600;color:rgba(255,255,255,.8);
  border-bottom:1px solid rgba(255,255,255,.07);transition:color var(--t),padding-left var(--t);
}
.mobile-menu a:hover{color:var(--accent);padding-left:6px}

.channel-bar{background:var(--ink-2);border-bottom:1px solid rgba(255,255,255,.07)}
.channel-inner{display:flex;align-items:center;gap:16px;min-height:48px}
.channel-label{
  flex:0 0 auto;font-size:12px;font-weight:700;letter-spacing:.16em;color:rgba(255,255,255,.42);
}
.channel-nav{
  display:flex;align-items:center;gap:10px;overflow-x:auto;scroll-snap-type:x proximity;
  padding:8px 0;-ms-overflow-style:none;scrollbar-width:none;
}
.channel-nav::-webkit-scrollbar{display:none}
.channel-tag{
  flex:0 0 auto;scroll-snap-align:start;
  font-size:13.5px;font-weight:600;padding:6px 14px;border-radius:999px;
  border:1px solid rgba(255,255,255,.2);color:rgba(255,255,255,.78);
  transition:color var(--t),border-color var(--t),background var(--t);
  white-space:nowrap;
}
.channel-tag:hover{color:#fff;border-color:var(--accent)}
.channel-tag.is-active{background:#fff;color:var(--ink);border-color:#fff}

/* ============ BUTTONS ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:52px;padding:0 26px;border-radius:var(--r);
  font-size:15px;font-weight:700;letter-spacing:.01em;
  transition:background var(--t),color var(--t),border-color var(--t),transform var(--t),box-shadow var(--t);
  white-space:nowrap;
}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--accent);transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.btn-ghost{background:transparent;border:1px solid var(--ink);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.btn-invert{background:#fff;color:var(--ink)}
.btn-invert:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.btn-invert-line{background:transparent;border:1px solid rgba(255,255,255,.5);color:#fff}
.btn-invert-line:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.btn-sm{height:40px;padding:0 18px;font-size:14px}
.btn:focus-visible,.channel-tag:focus-visible,.nav-link:focus-visible,
a:focus-visible,button:focus-visible,summary:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;
}

/* ============ SECTION ============ */
.section{padding:56px 0}
@media(min-width:768px){.section{padding:80px 0}}
@media(min-width:1024px){.section{padding:112px 0}}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:32px}
.section-title{
  font-size:clamp(26px,3.4vw,40px);font-weight:700;line-height:1.15;letter-spacing:-.02em;
}
.section-desc{font-size:15px;color:var(--muted);margin-top:10px;max-width:60ch}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;
  letter-spacing:.18em;color:var(--accent);margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--accent)}
.link-more{
  position:relative;font-size:14.5px;font-weight:700;color:var(--ink);white-space:nowrap;padding-bottom:2px;
}
.link-more::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--accent);
  transition:width var(--t);
}
.link-more:hover{color:var(--accent)}
.link-more:hover::after{width:100%}

/* ============ HERO ============ */
.hero{position:relative;background:var(--paper);overflow:hidden}
.hero::after{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,var(--ink) 0%,rgba(20,22,26,0) 100%);
}
.hero-grid{display:grid;grid-template-columns:1fr;gap:40px;padding:48px 0 56px}
@media(min-width:1024px){
  .hero-grid{grid-template-columns:6fr 6fr;gap:56px;padding:80px 0 96px;align-items:start}
}
.hero-copy{padding-top:4px}
.hero h1{
  font-size:clamp(38px,6.4vw,84px);font-weight:800;line-height:1.04;letter-spacing:-.03em;
  margin-bottom:20px;
}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-claim{font-size:clamp(17px,1.6vw,20px);font-weight:700;color:var(--ink-2);margin-bottom:12px}
.hero-note{font-size:16px;color:var(--muted);max-width:52ch;margin-bottom:32px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:40px}
.hero-stats{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;
  border-top:1px solid var(--line);padding-top:24px;max-width:560px;
}
.stat-num{font-size:clamp(24px,2.6vw,34px);font-weight:800;line-height:1.1;letter-spacing:-.02em}
.stat-label{font-size:13px;font-weight:600;letter-spacing:.08em;color:var(--muted);margin-top:6px}
.hero-media{position:relative}
.hero-figure{
  position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);
  aspect-ratio:4/3;background:#EDE9E2;
}
.hero-figure img{width:100%;height:100%;object-fit:cover}
.hero-badge{
  position:absolute;left:0;bottom:0;background:var(--paper-2);border:1px solid var(--line);
  border-left:3px solid var(--accent);padding:16px 20px;max-width:78%;
}
.hero-badge strong{display:block;font-size:15px;font-weight:700;margin-bottom:4px}
.hero-badge span{font-size:13.5px;color:var(--muted);line-height:1.7;display:block}
@media(min-width:1024px){.hero-media{margin-top:36px}}

/* ============ DIRECTORY ============ */
.dir-list{border-top:1px solid var(--line)}
.dir-item{
  display:flex;align-items:center;gap:18px;min-height:78px;padding:0 12px;
  border-bottom:1px solid var(--line);transition:background var(--t),padding-left var(--t);
}
@media(min-width:1024px){.dir-item{min-height:86px;padding:0 18px}}
.dir-item:hover{background:rgba(255,255,255,.85);padding-left:26px}
.dir-num{
  flex:0 0 auto;width:46px;font-size:14px;font-weight:700;letter-spacing:.06em;
  color:var(--ink);transition:color var(--t);
}
.dir-item:hover .dir-num{color:var(--accent)}
.dir-body{flex:1 1 auto;min-width:0}
.dir-title{font-size:17px;font-weight:700;line-height:1.5}
@media(min-width:768px){.dir-title{font-size:19px}}
.dir-sub{font-size:13.5px;color:var(--muted);margin-top:2px}
.dir-arrow{
  flex:0 0 auto;font-size:18px;color:var(--muted);transition:transform var(--t),color var(--t);
}
.dir-item:hover .dir-arrow{transform:translateX(4px);color:var(--accent)}

/* ============ CARDS ============ */
.card{
  display:flex;flex-direction:column;height:100%;
  background:var(--paper-2);border:1px solid var(--line);border-radius:var(--r);
  overflow:hidden;transition:transform var(--t),box-shadow var(--t),border-color var(--t);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D8D2C8}
.card-media{position:relative;overflow:hidden;background:#EDE9E2;aspect-ratio:16/9;flex:0 0 auto}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform var(--t)}
.card:hover .card-media img{transform:scale(1.03)}
.card-body{padding:20px;display:flex;flex-direction:column;gap:12px;flex:1 1 auto}
@media(min-width:768px){.card-body{padding:22px 24px}}
.badge{
  display:inline-flex;align-items:center;gap:6px;align-self:flex-start;
  font-size:12px;font-weight:700;letter-spacing:.04em;padding:4px 12px;border-radius:999px;
  border:1px solid var(--line);color:var(--accent-2);background:rgba(15,122,107,.05);
}
.badge-neutral{color:var(--muted);background:rgba(110,112,118,.06)}
.card-title{
  font-size:18px;font-weight:700;line-height:1.5;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  transition:color var(--t);
}
.card:hover .card-title{color:var(--accent)}
.card-excerpt{
  font-size:14.5px;line-height:1.85;color:var(--muted);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card-foot{
  margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-top:14px;border-top:1px solid var(--line);
}
.meta{font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--muted)}
.card-foot .arrow{color:var(--muted);transition:transform var(--t),color var(--t)}
.card:hover .card-foot .arrow{transform:translateX(4px);color:var(--accent)}

.grid-cards{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:640px){.grid-cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:1024px){.grid-cards{grid-template-columns:repeat(3,minmax(0,1fr))}}

/* ============ FEATURED ============ */
.featured-grid{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:1024px){.featured-grid{grid-template-columns:7fr 5fr}}
.featured-side{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:640px) and (max-width:1023px){.featured-side{grid-template-columns:repeat(2,minmax(0,1fr))}}
.card-wide{flex-direction:row}
.card-wide .card-media{aspect-ratio:1/1;width:42%;flex:0 0 42%}
.card-wide .card-body{padding:20px}
@media(min-width:1024px){.card-wide .card-body{padding:22px}}
.card-hero .card-media{aspect-ratio:4/3}
.card-hero .card-title{font-size:clamp(20px,2vw,26px);-webkit-line-clamp:3}
.card-hero .card-excerpt{font-size:15.5px;-webkit-line-clamp:3}

/* ============ RAIL ============ */
.rail-head{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:28px}
.rail-btns{display:flex;gap:8px}
.rail-btn{
  width:40px;height:40px;border:1px solid var(--line);border-radius:var(--r);
  display:inline-flex;align-items:center;justify-content:center;color:var(--ink);
  background:var(--paper-2);transition:border-color var(--t),color var(--t),background var(--t);
}
.rail-btn:hover{border-color:var(--accent);color:var(--accent)}
.rail{
  display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;
  padding-bottom:10px;-ms-overflow-style:none;scrollbar-width:none;
}
.rail::-webkit-scrollbar{display:none}
.rail-card{
  flex:0 0 280px;scroll-snap-align:start;background:var(--paper-2);
  border:1px solid var(--line);border-radius:var(--r);overflow:hidden;
  transition:transform var(--t),box-shadow var(--t);
}
.rail-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.rail-media{aspect-ratio:16/10;overflow:hidden;background:#EDE9E2}
.rail-media img{width:100%;height:100%;object-fit:cover;transition:transform var(--t)}
.rail-card:hover .rail-media img{transform:scale(1.03)}
.rail-body{padding:16px 18px 20px}
.rail-body h3{font-size:16px;font-weight:700;line-height:1.6;margin-top:10px}
.rail-card:hover .rail-body h3{color:var(--accent)}

/* ============ CTA ============ */
.cta-band{background:var(--ink);color:#fff;padding:56px 0}
@media(min-width:1024px){.cta-band{padding:88px 0}}
.cta-inner{max-width:760px;margin:0 auto;text-align:center}
.cta-inner h2{
  font-size:clamp(26px,3.6vw,42px);font-weight:800;line-height:1.15;letter-spacing:-.02em;margin-bottom:14px;
}
.cta-inner p{color:rgba(255,255,255,.68);font-size:16px;margin-bottom:32px}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-bottom:32px}
.share-row{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.share-row span{font-size:13px;letter-spacing:.1em;font-weight:600;color:rgba(255,255,255,.45)}
.share-dot{
  width:40px;height:40px;border-radius:999px;border:1px solid rgba(255,255,255,.22);
  display:inline-flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;
  color:rgba(255,255,255,.72);transition:border-color var(--t),color var(--t),background var(--t);
}
.share-dot:hover{border-color:var(--accent);color:var(--accent);background:rgba(255,75,31,.1)}

/* ============ FAQ ============ */
.faq-list{border-top:1px solid var(--line);max-width:920px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  list-style:none;cursor:pointer;position:relative;
  padding:22px 40px 22px 0;font-size:17px;font-weight:600;line-height:1.6;
  transition:color var(--t),padding-left var(--t);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";position:absolute;right:6px;top:50%;transform:translateY(-50%);
  font-size:20px;font-weight:400;color:var(--muted);transition:color var(--t),transform var(--t);
}
.faq-item[open] summary::after{content:"–";color:var(--accent)}
.faq-item summary:hover{color:var(--accent)}
.faq-item[open] summary{padding-left:16px;color:var(--ink)}
.faq-item[open] summary::before{
  content:"";position:absolute;left:0;top:22px;bottom:22px;width:2px;background:var(--accent);
}
.faq-answer{padding:0 40px 24px 16px;font-size:15.5px;line-height:1.9;color:var(--muted)}

/* ============ EMPTY ============ */
.empty-state{
  border:1px dashed var(--line);border-radius:var(--r);background:var(--paper-2);
  padding:48px 24px;text-align:center;
}
.empty-state p{color:var(--muted);font-size:15.5px;margin-bottom:12px}

/* ============ FOOTER ============ */
.site-footer{background:var(--ink);color:rgba(255,255,255,.72);padding:56px 0 0}
@media(min-width:1024px){.site-footer{padding:80px 0 0}}
.footer-grid{display:grid;grid-template-columns:1fr;gap:36px;padding-bottom:44px}
@media(min-width:640px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:1024px){.footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:44px}}
.footer-brand .logo{margin-bottom:16px}
.footer-brand p{font-size:14.5px;line-height:1.9;color:rgba(255,255,255,.6);max-width:34ch}
.footer-col h3{
  font-size:13px;font-weight:700;letter-spacing:.16em;color:#fff;margin-bottom:16px;
}
.footer-col li{margin-bottom:10px}
.footer-col a{
  font-size:14.5px;color:rgba(255,255,255,.66);transition:color var(--t);
  position:relative;
}
.footer-col a:hover{color:var(--accent);text-decoration:underline}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:22px 0;
  display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;
  font-size:13.5px;color:rgba(255,255,255,.45);
}

/* ============ REVEAL ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 520ms cubic-bezier(.22,.61,.36,1),transform 520ms cubic-bezier(.22,.61,.36,1)}
.reveal.is-in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category1 */
:root{
  --paper:#F7F5F1;
  --paper-2:#FFFFFF;
  --ink:#14161A;
  --ink-2:#2A2E36;
  --line:#E4DFD7;
  --accent:#FF4B1F;
  --accent-2:#0F7A6B;
  --muted:#6E7076;
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  font-size:16.5px;
  line-height:1.95;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit}
ul,ol{margin:0;padding:0}
h1,h2,h3,h4,p{margin:0}
.num{font-family:'Inter','Helvetica Neue',Arial,sans-serif;font-variant-numeric:tabular-nums;letter-spacing:0}
.container{width:100%;max-width:1280px;margin:0 auto;padding:0 20px}
@media (min-width:640px){.container{padding:0 24px}}
@media (min-width:1024px){.container{padding:0 40px}}
a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--paper);border-bottom:1px solid var(--line)}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:70px}
.logo{display:inline-flex;align-items:center;gap:10px}
.logo-mark{
  width:30px;height:30px;flex:0 0 30px;display:grid;place-items:center;
  background:var(--ink);color:#fff;font-weight:800;font-size:15px;border-radius:var(--radius);
}
.logo-text{font-size:17px;font-weight:800;letter-spacing:-.01em}
.topbar-actions{display:flex;align-items:center;gap:18px}
.link-quiet{font-size:14.5px;font-weight:600;color:var(--muted);position:relative;transition:color .2s var(--ease)}
.link-quiet::after{content:"";position:absolute;left:0;bottom:-4px;height:1px;width:0;background:var(--accent);transition:width .2s var(--ease)}
.link-quiet:hover{color:var(--accent)}
.link-quiet:hover::after{width:100%}
.channelbar{background:var(--paper-2);border-bottom:1px solid var(--line)}
.main-nav{display:flex;align-items:center;gap:6px;height:56px;overflow-x:auto;scroll-snap-type:x mandatory;-ms-overflow-style:none;scrollbar-width:none}
.main-nav::-webkit-scrollbar{display:none}
.nav-link{
  flex:0 0 auto;scroll-snap-align:start;padding:9px 15px;border-radius:var(--radius);
  font-size:14px;font-weight:600;color:var(--muted);white-space:nowrap;
  border:1px solid transparent;transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.nav-link:hover{color:var(--ink);border-color:var(--line)}
.nav-link.is-active{background:var(--ink);color:#fff;border-color:var(--ink)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:52px;padding:0 26px;border-radius:var(--radius);border:1px solid transparent;
  font-size:15px;font-weight:700;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.btn-light{background:#fff;color:var(--ink)}
.btn-light:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.btn-outline-light{background:transparent;border-color:rgba(255,255,255,.5);color:#fff}
.btn-outline-light:hover{border-color:#fff;background:rgba(255,255,255,.08);transform:translateY(-2px)}
.btn-sm{height:42px;padding:0 18px;font-size:13.5px}
@media (max-width:767px){.topbar-actions .link-quiet{display:none}}

/* ---------- hero ---------- */
.cat-hero{padding:48px 0 8px}
.cat-hero-grid{display:grid;gap:32px}
@media (min-width:1024px){.cat-hero-grid{grid-template-columns:7fr 5fr;gap:56px;align-items:end}}
.chip{
  display:inline-flex;align-items:center;gap:6px;height:28px;padding:0 12px;border-radius:999px;
  border:1px solid var(--accent-2);color:var(--accent-2);font-size:12px;font-weight:600;letter-spacing:.04em;
}
.chip-neutral{border-color:var(--line);color:var(--muted)}
h1.cat-title{
  font-size:clamp(34px,5.4vw,62px);line-height:1.06;font-weight:800;letter-spacing:-.03em;
  margin:18px 0 18px;
}
.hero-lede{font-size:18px;color:var(--ink-2);max-width:34em}
.hero-note{margin-top:10px;font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--muted)}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.hero-media{border:1px solid var(--line);border-radius:var(--radius)}
.hero-media img{width:100%;aspect-ratio:4/3;object-fit:cover}

/* ---------- sections ---------- */
.section{padding:52px 0;scroll-margin-top:130px}
@media (min-width:1024px){.section{padding:84px 0}}
.section-alt{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:32px}
.section-head h2{font-size:clamp(24px,3vw,36px);font-weight:700;line-height:1.15;letter-spacing:-.02em}
.section-sub{margin-top:8px;font-size:14.5px;color:var(--muted)}
.text-link{font-size:14px;font-weight:700;color:var(--ink);position:relative;display:inline-flex;align-items:center;gap:6px}
.text-link::after{content:"";position:absolute;left:0;bottom:-3px;height:1px;width:0;background:var(--accent);transition:width .2s var(--ease)}
.text-link:hover{color:var(--accent)}
.text-link:hover::after{width:100%}

/* ---------- directory layout ---------- */
.dir-layout{display:grid;gap:32px}
@media (min-width:1024px){.dir-layout{grid-template-columns:260px 1fr;gap:56px}}
.dir-aside{border-top:1px solid var(--line)}
@media (min-width:1024px){.dir-aside{position:sticky;top:140px;align-self:start}}
.toc-title{font-size:12px;font-weight:600;letter-spacing:.16em;color:var(--muted);padding:14px 0 10px}
.toc li{border-bottom:1px solid var(--line)}
.toc a{display:flex;gap:12px;align-items:baseline;padding:12px 0;font-size:14.5px;color:var(--muted);transition:color .2s var(--ease)}
.toc a .idx{font-weight:700;color:var(--ink);font-size:13px;transition:color .2s var(--ease)}
.toc a:hover,.toc a:hover .idx{color:var(--accent)}
@media (max-width:1023px){
  .dir-aside{border-top:1px solid var(--line);overflow-x:auto;-ms-overflow-style:none;scrollbar-width:none}
  .dir-aside::-webkit-scrollbar{display:none}
  .toc{display:flex;gap:8px;min-width:max-content;padding-bottom:4px}
  .toc li{border-bottom:0}
  .toc a{padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius);white-space:nowrap}
  .toc-title{display:none}
}
.entry{display:grid;gap:22px;padding:28px 0;border-top:1px solid var(--line)}
.entry:first-of-type{border-top:0;padding-top:0}
@media (min-width:768px){.entry{grid-template-columns:1fr 300px;gap:36px;padding:36px 0}}
.entry-head{display:flex;align-items:baseline;gap:14px}
.entry-index{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.1em}
.entry h3{font-size:22px;font-weight:700;line-height:1.3}
.entry-meta{margin-top:10px;font-size:12.5px;font-weight:600;letter-spacing:.06em;color:var(--muted)}
.entry p{margin-top:14px;color:var(--ink-2)}
.entry-points{list-style:none;display:grid;gap:8px;margin-top:16px}
.entry-points li{position:relative;padding-left:18px;font-size:15.5px;color:var(--ink-2)}
.entry-points li::before{content:"";position:absolute;left:0;top:.68em;width:6px;height:6px;background:var(--ink)}
.img-frame{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:#EFEBE4}
.img-frame img{width:100%;height:100%;object-fit:cover;transition:transform .25s var(--ease)}
.img-frame:hover img{transform:scale(1.03)}
.ratio-4x3{aspect-ratio:4/3}
.ratio-16x9{aspect-ratio:16/9}
.ratio-1x1{aspect-ratio:1/1}
.entry-figure figcaption{margin-top:10px;font-size:12.5px;color:var(--muted)}

/* ---------- metric rows ---------- */
.metric-list{border-top:1px solid var(--line)}
.metric-row{display:grid;gap:6px;padding:20px 0;border-bottom:1px solid var(--line);transition:background .2s var(--ease)}
.metric-row:hover{background:rgba(20,22,26,.025)}
@media (min-width:768px){
  .metric-row{grid-template-columns:230px 1fr 150px;gap:24px;align-items:center}
}
.metric-name{font-size:17px;font-weight:700}
.metric-desc{font-size:15px;color:var(--muted)}
.metric-value{font-size:20px;font-weight:800;color:var(--accent-2)}
@media (min-width:768px){.metric-value{text-align:right}}

/* ---------- timeline ---------- */
.timeline{border-top:1px solid var(--line)}
.timeline-item{display:grid;gap:6px;padding:20px 0;border-bottom:1px solid var(--line)}
@media (min-width:768px){.timeline-item{grid-template-columns:150px 1fr;gap:28px;align-items:baseline}}
.timeline-time{font-size:20px;font-weight:800;letter-spacing:-.01em}
.timeline-time span{display:block;font-size:12px;font-weight:600;letter-spacing:.12em;color:var(--muted);margin-top:2px}
.timeline-body{font-size:15.5px;color:var(--ink-2)}

/* ---------- feature rows ---------- */
.feature-row{
  display:grid;grid-template-columns:104px 1fr;gap:18px;align-items:center;
  padding:18px 0;border-top:1px solid var(--line);
}
@media (min-width:768px){.feature-row{grid-template-columns:168px 1fr;gap:28px;padding:22px 0}}
.feature-row:last-child{border-bottom:1px solid var(--line)}
.feature-row h3{font-size:19px;font-weight:700;line-height:1.35;transition:color .2s var(--ease)}
.feature-row:hover h3{color:var(--accent)}
.feature-row p{margin-top:6px;font-size:15px;color:var(--muted)}
.feature-tag{margin-top:10px;display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;border:1px solid var(--line);font-size:12px;font-weight:600;color:var(--muted)}

/* ---------- cards ---------- */
.card-grid{display:grid;gap:20px}
@media (min-width:640px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr);gap:24px}}
.card{
  display:flex;flex-direction:column;background:var(--paper-2);border:1px solid var(--line);
  border-radius:var(--radius);padding:20px;transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(20,22,26,.08);border-color:#D8D1C6}
.card .img-frame{margin-bottom:16px}
.card h3{font-size:18px;font-weight:700;line-height:1.4;transition:color .2s var(--ease)}
.card:hover h3{color:var(--accent)}
.card p{margin-top:8px;font-size:15px;color:var(--muted)}
.card-foot{margin-top:auto;padding-top:16px;display:flex;align-items:center;justify-content:space-between;font-size:12.5px;font-weight:600;letter-spacing:.06em;color:var(--muted)}
.card-foot .arrow{transition:transform .2s var(--ease)}
.card:hover .card-foot .arrow{transform:translateX(4px);color:var(--accent)}

/* ---------- faq ---------- */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  position:relative;list-style:none;cursor:pointer;padding:20px 40px 20px 20px;
  font-size:17px;font-weight:600;transition:color .2s var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{
  content:"";position:absolute;left:0;top:22px;bottom:22px;width:2px;background:var(--line);
  transition:background .2s var(--ease);
}
.faq-item summary::after{
  content:"+";position:absolute;right:8px;top:50%;transform:translateY(-50%);
  font-size:20px;font-weight:400;color:var(--muted);transition:color .2s var(--ease);
}
.faq-item[open] summary{color:var(--ink)}
.faq-item[open] summary::before{background:var(--accent)}
.faq-item[open] summary::after{content:"−";color:var(--accent)}
.faq-item summary:hover{color:var(--accent)}
.faq-answer{padding:0 40px 22px 20px;font-size:15.5px;line-height:1.9;color:var(--ink-2);animation:fadeUp .25s var(--ease) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}

/* ---------- cta ---------- */
.cta-band{background:var(--ink);color:#fff;padding:60px 0}
@media (min-width:1024px){.cta-band{padding:88px 0}}
.cta-band h2{font-size:clamp(26px,3.6vw,42px);font-weight:800;line-height:1.16;letter-spacing:-.02em}
.cta-band p{margin-top:14px;font-size:16px;color:rgba(255,255,255,.72);max-width:40em}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.share-row{display:flex;align-items:center;gap:12px;margin-top:32px;padding-top:24px;border-top:1px solid rgba(255,255,255,.16)}
.share-row span{font-size:12px;font-weight:600;letter-spacing:.14em;color:rgba(255,255,255,.5)}
.share-btn{
  width:38px;height:38px;display:grid;place-items:center;border-radius:999px;
  border:1px solid rgba(255,255,255,.28);color:#fff;background:transparent;cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.share-btn:hover{background:var(--accent);border-color:var(--accent);color:#fff}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.78);padding:56px 0 28px;margin-top:0}
.footer-grid{display:grid;gap:32px}
@media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}}
.footer-brand .logo{margin-bottom:16px}
.footer-brand .logo-mark{background:#fff;color:var(--ink)}
.footer-brand .logo-text{color:#fff}
.footer-brand p{font-size:14.5px;line-height:1.85;color:rgba(255,255,255,.62);max-width:26em}
.footer-col h3{font-size:13px;font-weight:700;letter-spacing:.14em;color:#fff;margin-bottom:16px}
.footer-col ul{list-style:none;display:grid;gap:10px}
.footer-col a{font-size:14.5px;color:rgba(255,255,255,.68);transition:color .2s var(--ease)}
.footer-col a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{
  margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.14);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
  font-size:13px;color:rgba(255,255,255,.5);
}

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

/* roulang page: article */
:root{
  --paper:#F7F5F1;
  --paper-2:#FFFFFF;
  --ink:#14161A;
  --ink-2:#2A2E36;
  --line:#E4DFD7;
  --accent:#FF4B1F;
  --accent-2:#0F7A6B;
  --muted:#6E7076;
  --soft:#F1EDE6;
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-hover:0 12px 32px rgba(20,22,26,.08);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  font-size:16.5px;
  line-height:1.95;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none;transition:color .2s var(--ease)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.02em}
p{margin:0}
table{border-collapse:collapse}
::selection{background:var(--accent);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.num,.tnum{font-family:'Inter','Helvetica Neue',Arial,sans-serif;font-variant-numeric:tabular-nums}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--paper)}
::-webkit-scrollbar-thumb{background:#CFC8BE;border-radius:8px}
::-webkit-scrollbar-thumb:hover{background:#B9B1A5}

.container{width:100%;max-width:1280px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 24px}}
@media (min-width:1024px){.container{padding:0 40px}}

/* ---------- 按钮与文字链 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:50px;padding:0 26px;border-radius:var(--radius);
  font-size:15px;font-weight:700;line-height:1;white-space:nowrap;
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-inverse{background:#fff;color:var(--ink)}
.btn-inverse:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.btn-ghost-inverse{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.45)}
.btn-ghost-inverse:hover{border-color:var(--accent);color:var(--accent)}
.btn-sm{height:44px;padding:0 20px;font-size:14px}
.text-link{
  position:relative;display:inline-flex;align-items:center;gap:6px;
  font-size:15px;font-weight:700;padding-bottom:2px;
}
.text-link::after{
  content:'';position:absolute;left:0;bottom:0;width:0;height:1px;
  background:var(--accent);transition:width .2s var(--ease);
}
.text-link:hover{color:var(--accent)}
.text-link:hover::after{width:100%}

/* ---------- 头部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(247,245,241,.95);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
}
.brand-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;height:70px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.01em}
.logo-mark{
  display:grid;place-items:center;width:32px;height:32px;
  background:var(--ink);color:#fff;border-radius:var(--radius);
  font-size:16px;font-weight:800;line-height:1;flex:none;
}
.logo-text{font-size:17px;white-space:nowrap}
.header-actions{display:flex;align-items:center;gap:20px}
.channel-bar{border-top:1px solid var(--line);background:rgba(255,255,255,.5)}
.channel-inner{
  display:flex;align-items:center;height:54px;gap:6px;
  overflow-x:auto;scrollbar-width:none;scroll-snap-type:x proximity;
}
.channel-inner::-webkit-scrollbar{display:none}
.main-nav{display:flex;align-items:center;gap:6px}
.nav-link{
  display:inline-flex;align-items:center;height:34px;padding:0 14px;
  border:1px solid transparent;border-radius:999px;
  font-size:14.5px;font-weight:600;color:var(--ink-2);white-space:nowrap;
  scroll-snap-align:start;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link:hover{color:var(--accent);border-color:var(--line)}
.nav-link.is-active{background:var(--ink);color:#fff;border-color:var(--ink)}
@media (max-width:640px){
  .header-text-link{display:none}
  .logo-text{font-size:15.5px}
  .brand-inner{height:62px}
}

/* ---------- 文章头 ---------- */
.article-hero{position:relative;background:var(--ink);color:#fff;padding:56px 0 52px;overflow:hidden}
.hero-bg{
  position:absolute;inset:0;
  background:url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
  opacity:.22;
}
.hero-inner{position:relative;z-index:2;max-width:1000px}
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-size:13px;font-weight:600;letter-spacing:.06em;
  color:rgba(255,255,255,.6);margin-bottom:28px;
}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb .sep{color:rgba(255,255,255,.28)}
.crumb-current{color:rgba(255,255,255,.82)}
.kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;font-weight:700;letter-spacing:.14em;color:#fff;margin-bottom:18px;
}
.kicker::before{content:'';width:3px;height:16px;background:var(--accent);display:block}
.article-title{
  font-size:clamp(28px,4.2vw,52px);
  font-weight:800;line-height:1.16;letter-spacing:-.03em;color:#fff;
}
.article-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;
  margin-top:26px;padding-top:22px;
  border-top:1px solid rgba(255,255,255,.14);
  font-size:13px;font-weight:600;letter-spacing:.08em;color:rgba(255,255,255,.66);
}
.article-meta .dot{width:4px;height:4px;border-radius:50%;background:rgba(255,255,255,.35);display:block}
.share-group{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.share-btn{
  display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 16px;
  border:1px solid rgba(255,255,255,.28);border-radius:var(--radius);
  font-size:13px;font-weight:600;color:rgba(255,255,255,.82);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.share-btn:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- 阅读布局 ---------- */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:40px;padding:48px 0 64px}
@media (min-width:1280px){
  .article-layout{grid-template-columns:240px minmax(0,1fr);gap:56px;padding:72px 0 88px}
}
.toc-side{display:none}
@media (min-width:1280px){.toc-side{display:block}}
.toc-sticky{position:sticky;top:160px}
.toc-title{
  font-size:13px;font-weight:700;letter-spacing:.16em;color:var(--muted);
  padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:14px;
}
.toc-list{display:flex;flex-direction:column;align-items:stretch}
.toc-list a{
  display:flex;gap:10px;padding:9px 10px;
  font-size:14px;line-height:1.55;color:var(--muted);
  border-left:1px solid var(--line);
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.toc-list a:hover{color:var(--ink);border-left-color:var(--accent);background:rgba(255,75,31,.05)}
.toc-list a.is-current{color:var(--ink);font-weight:700;border-left-color:var(--accent);background:rgba(255,75,31,.06)}
.toc-index{font-size:12px;font-weight:700;color:var(--accent);flex:none;line-height:1.9}
.toc-back{margin-top:20px;font-size:13px}
.article-main{max-width:820px;min-width:0}

/* ---------- 正文排版 ---------- */
.article-body{color:var(--ink-2);font-size:16.5px;line-height:1.95}
.article-body > * + *{margin-top:22px}
.article-body h2{
  position:relative;padding-left:16px;
  font-size:clamp(21px,2.3vw,30px);font-weight:800;line-height:1.28;
  letter-spacing:-.02em;color:var(--ink);margin-top:50px;scroll-margin-top:110px;
}
.article-body h2::before{
  content:'';position:absolute;left:0;top:.2em;bottom:.2em;width:3px;background:var(--accent);
}
.article-body h3{
  font-size:clamp(18px,1.8vw,22px);font-weight:700;line-height:1.4;
  color:var(--ink);margin-top:36px;scroll-margin-top:110px;
}
.article-body p{margin:0}
.article-body strong{font-weight:700;color:var(--ink)}
.article-body a{color:var(--accent-2);text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{color:var(--accent)}
.article-body ul li{position:relative;padding-left:22px;margin-top:12px}
.article-body ul li::before{
  content:'';position:absolute;left:2px;top:.75em;width:6px;height:6px;background:var(--ink);
}
.article-body ol{counter-reset:item}
.article-body ol li{position:relative;padding-left:32px;margin-top:12px;counter-increment:item}
.article-body ol li::before{
  content:counter(item,decimal-leading-zero);
  position:absolute;left:0;top:0;font-size:13px;font-weight:700;color:var(--accent);line-height:2.2;
}
.article-body blockquote{
  margin:32px 0;padding:20px 24px;background:#FBFAF7;
  border-left:3px solid var(--accent);color:var(--ink-2);
}
.article-body blockquote p + p{margin-top:12px}
.article-body img{width:100%;border-radius:var(--radius);margin:28px 0}
.article-body figure{margin:28px 0}
.article-body figure img{margin:0}
.article-body figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:10px}
.article-body hr{border:0;border-top:1px solid var(--line);margin:44px 0}
.article-body table{width:100%;font-size:15px;overflow-x:auto;display:block}
.article-body th,.article-body td{border-bottom:1px solid var(--line);padding:12px 14px;text-align:left;vertical-align:top}
.article-body th{background:var(--soft);font-weight:700;color:var(--ink)}

/* ---------- 空态 ---------- */
.empty-state{
  padding:56px 24px;text-align:center;
  border:1px dashed var(--line);border-radius:var(--radius);background:var(--paper-2);
}
.empty-mark{
  width:44px;height:44px;margin:0 auto 18px;display:grid;place-items:center;
  background:var(--ink);color:#fff;border-radius:var(--radius);font-weight:800;
}
.empty-state h2{font-size:22px;font-weight:800;color:var(--ink);margin-bottom:12px}
.empty-state p{color:var(--muted);max-width:460px;margin:0 auto 24px;font-size:15px}

/* ---------- 标签 / 前后篇 ---------- */
.tag-row{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin-top:48px;padding-top:28px;border-top:1px solid var(--line);
}
.tag-label{font-size:13px;font-weight:700;letter-spacing:.14em;color:var(--muted);margin-right:4px}
.tag{
  display:inline-flex;align-items:center;height:30px;padding:0 14px;
  border:1px solid var(--line);border-radius:999px;background:var(--paper-2);
  font-size:13px;font-weight:600;color:var(--ink-2);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.tag:hover{border-color:var(--accent);color:var(--accent)}
.post-nav{display:grid;grid-template-columns:1fr;gap:14px;margin-top:32px}
@media (min-width:640px){.post-nav{grid-template-columns:1fr 1fr}}
.post-nav-item{
  display:flex;flex-direction:column;gap:8px;padding:20px 22px;
  background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.post-nav-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D8D1C7}
.post-nav-dir{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--accent)}
.post-nav-title{font-size:16px;font-weight:700;color:var(--ink)}
.post-nav-next{text-align:right;align-items:flex-end}

/* ---------- 板块与卡片 ---------- */
.section{padding:56px 0}
@media (min-width:1024px){.section{padding:80px 0}}
.section-alt{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px;margin-bottom:32px;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;font-weight:700;letter-spacing:.16em;color:var(--muted);margin-bottom:12px;
}
.eyebrow::before{content:'';width:22px;height:1px;background:var(--accent);display:block}
.section-head h2{font-size:clamp(24px,2.6vw,36px);font-weight:800;line-height:1.2;letter-spacing:-.03em}
.section-desc{font-size:14.5px;color:var(--muted);margin-top:10px;max-width:520px}
.card-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media (min-width:640px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr);gap:24px}}
.card{
  display:flex;flex-direction:column;gap:16px;
  padding:20px;background:var(--paper-2);
  border:1px solid var(--line);border-radius:var(--radius);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D8D1C7}
.card-media{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:var(--radius);background:var(--soft)}
.card-media img{width:100%;height:100%;object-fit:cover;transition:transform .35s var(--ease)}
.card:hover .card-media img{transform:scale(1.03)}
.badge{
  align-self:flex-start;display:inline-flex;align-items:center;height:24px;padding:0 12px;
  border:1px solid var(--line);border-radius:999px;background:var(--paper-2);
  font-size:12px;font-weight:600;letter-spacing:.04em;color:var(--accent-2);
}
.badge-neutral{color:var(--muted)}
.card-title{
  font-size:18px;font-weight:700;line-height:1.5;letter-spacing:-.01em;color:var(--ink);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  transition:color .2s var(--ease);
}
.card:hover .card-title{color:var(--accent)}
.card-excerpt{
  font-size:14.5px;line-height:1.85;color:var(--muted);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card-foot{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  font-size:13px;font-weight:600;color:var(--muted);
}
.arrow{color:var(--accent);transition:transform .2s var(--ease)}
.card:hover .arrow{transform:translateX(4px)}

/* ---------- 深色 CTA ---------- */
.cta-band{background:var(--ink);color:#fff;padding:64px 0;margin-top:8px}
.cta-inner{max-width:820px}
.cta-band h2{font-size:clamp(24px,3vw,38px);font-weight:800;line-height:1.22;letter-spacing:-.03em}
.cta-band p{margin-top:14px;font-size:15.5px;line-height:1.9;color:rgba(255,255,255,.66);max-width:640px}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.cta-share{display:flex;flex-wrap:wrap;gap:10px;margin-top:32px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12)}
.cta-share span{
  display:inline-flex;align-items:center;height:34px;padding:0 14px;
  border:1px solid rgba(255,255,255,.18);border-radius:var(--radius);
  font-size:13px;font-weight:600;color:rgba(255,255,255,.6);
}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.72);padding:64px 0 28px}
.footer-grid{
  display:grid;grid-template-columns:1fr;gap:36px;
  padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.12);
}
@media (min-width:768px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.7fr 1fr 1fr 1fr;gap:48px}}
.footer-brand .logo{color:#fff;margin-bottom:18px}
.footer-brand .logo-mark{background:#fff;color:var(--ink)}
.footer-brand p{font-size:14.5px;line-height:1.9;color:rgba(255,255,255,.58);max-width:340px}
.footer-col h3{font-size:13px;font-weight:700;letter-spacing:.16em;color:#fff;margin-bottom:18px}
.footer-col ul{display:flex;flex-direction:column;gap:11px}
.footer-col a{font-size:14.5px;color:rgba(255,255,255,.64)}
.footer-col a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px 20px;justify-content:space-between;
  padding-top:24px;font-size:13px;color:rgba(255,255,255,.45);
}

/* ---------- 回到顶部 ---------- */
.back-top{
  position:fixed;right:20px;bottom:24px;z-index:70;
  width:46px;height:46px;display:grid;place-items:center;
  background:var(--ink);color:#fff;border-radius:var(--radius);
  font-size:18px;font-weight:700;
  transition:background-color .2s var(--ease),transform .2s var(--ease);
}
.back-top:hover{background:var(--accent);transform:translateY(-2px)}
@media (min-width:1024px){.back-top{right:40px;bottom:40px}}

/* ---------- 入场动效 ---------- */
.js .reveal{opacity:0;transform:translateY(12px)}
.js .reveal.is-in{
  opacity:1;transform:translateY(0);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .reveal{opacity:1 !important;transform:none !important}
  *{animation:none !important;transition:none !important}
}

/* roulang page: category2 */
:root{
  --paper:#F7F5F1;
  --paper-2:#FFFFFF;
  --ink:#14161A;
  --ink-2:#2A2E36;
  --line:#E4DFD7;
  --accent:#FF4B1F;
  --accent-2:#0F7A6B;
  --muted:#6E7076;
  --radius:2px;
  --shadow-hover:0 12px 32px rgba(20,22,26,.08);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-cn:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-num:'Inter','Helvetica Neue',Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--font-cn);font-size:16.5px;line-height:1.95;font-weight:400;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none;transition:color 200ms var(--ease),border-color 200ms var(--ease)}
button{font:inherit;color:inherit;cursor:pointer;border:none;background:none}
h1,h2,h3,h4,p,ul,ol{margin:0}
ul{list-style:none;padding:0}
.num{font-family:var(--font-num);font-feature-settings:"tnum" 1,"lnum" 1}

.container{width:100%;max-width:1280px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 24px}}
@media(min-width:1024px){.container{padding:0 40px}}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60;background:var(--paper)}
.brand-bar{background:var(--ink);color:#fff;position:relative}
.brand-inner{display:flex;align-items:center;gap:20px;min-height:72px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.02em;font-size:17px;color:#fff}
.logo-mark{width:34px;height:34px;display:grid;place-items:center;background:var(--accent);color:#fff;border-radius:var(--radius);font-weight:800;font-size:17px;line-height:1}
.logo-text{white-space:nowrap}
.main-nav{display:none}
@media(min-width:1024px){
  .main-nav{display:flex;align-items:center;gap:2px;margin-left:12px}
}
.nav-link{
  display:inline-block;padding:10px 14px;font-size:15px;font-weight:500;
  color:rgba(255,255,255,.76);border-bottom:2px solid transparent;
  transition:color 200ms var(--ease),border-color 200ms var(--ease);
}
.nav-link:hover{color:#fff}
.nav-link.is-active{color:#fff;border-bottom-color:var(--accent)}
.brand-actions{margin-left:auto;display:flex;align-items:center;gap:14px}
.text-link{font-size:14.5px;color:rgba(255,255,255,.76);position:relative}
.text-link:hover{color:#fff}
.text-link::after{content:"";position:absolute;left:0;bottom:-3px;height:1px;width:0;background:var(--accent);transition:width 220ms var(--ease)}
.text-link:hover::after{width:100%}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:52px;padding:0 26px;border-radius:var(--radius);
  font-size:15px;font-weight:700;letter-spacing:.01em;
  transition:background-color 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),transform 200ms var(--ease);
}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.btn-outline{border:1px solid var(--ink);color:var(--ink);background:transparent}
.btn-outline:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.btn-ghost-light{border:1px solid rgba(255,255,255,.42);color:#fff;background:transparent}
.btn-ghost-light:hover{border-color:#fff;background:#fff;color:var(--ink);transform:translateY(-2px)}
.btn-sm{height:44px;padding:0 18px;font-size:14px}
.btn:focus-visible,.nav-link:focus-visible,.text-link:focus-visible,.channel-tag:focus-visible,.card-link:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.nav-toggle{
  display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;
  border:1px solid rgba(255,255,255,.28);border-radius:var(--radius);color:#fff;
}
@media(min-width:1024px){.nav-toggle{display:none}}
.main-nav.is-open{
  display:flex;flex-direction:column;align-items:stretch;gap:0;
  position:absolute;left:16px;right:16px;top:72px;background:var(--ink-2);
  border:1px solid rgba(255,255,255,.12);padding:8px;border-radius:var(--radius);
}
.main-nav.is-open .nav-link{border-bottom:1px solid rgba(255,255,255,.08)}
.main-nav.is-open .nav-link.is-active{border-bottom-color:var(--accent)}

.channel-bar{background:var(--paper-2);border-bottom:1px solid var(--line)}
.channel-nav{
  display:flex;gap:10px;padding:14px 0;overflow-x:auto;
  scroll-snap-type:x mandatory;-ms-overflow-style:none;scrollbar-width:none;
}
.channel-nav::-webkit-scrollbar{display:none}
.channel-tag{
  flex:0 0 auto;scroll-snap-align:start;
  padding:8px 16px;border:1px solid var(--line);border-radius:999px;
  font-size:13.5px;font-weight:600;color:var(--muted);
  transition:color 200ms var(--ease),border-color 200ms var(--ease),background-color 200ms var(--ease);
}
.channel-tag:hover{color:var(--accent);border-color:var(--accent)}
.channel-tag.is-active{background:var(--ink);border-color:var(--ink);color:#fff}

/* ---------- shared bits ---------- */
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border:1px solid var(--line);border-radius:999px;
  font-size:12px;font-weight:600;letter-spacing:.06em;color:var(--accent-2);background:var(--paper-2);
}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.12em;color:var(--muted)}
.section{padding:56px 0}
@media(min-width:768px){.section{padding:80px 0}}
@media(min-width:1024px){.section{padding:104px 0}}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:32px}
.section-head h2{font-size:clamp(26px,3.2vw,40px);font-weight:700;line-height:1.15;letter-spacing:-.02em}
.section-head .sub{margin-top:10px;font-size:15px;color:var(--muted);max-width:56ch}
.hairline{height:1px;background:var(--line);border:0;margin:0}
.arrow{display:inline-block;transition:transform 220ms var(--ease)}
.link-more{display:inline-flex;align-items:center;gap:8px;font-size:14.5px;font-weight:700;position:relative;color:var(--ink)}
.link-more::after{content:"";position:absolute;left:0;bottom:-4px;height:1px;width:0;background:var(--accent);transition:width 220ms var(--ease)}
.link-more:hover{color:var(--accent)}
.link-more:hover::after{width:100%}
.link-more:hover .arrow{transform:translateX(4px)}

.media{overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-2)}
.media img{width:100%;height:100%;object-fit:cover;transition:transform 420ms var(--ease)}
.media-hover:hover img{transform:scale(1.03)}
.r-43{aspect-ratio:4/3}
.r-11{aspect-ratio:1/1}
.r-169{aspect-ratio:16/9}

.card{
  background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  transition:transform 200ms var(--ease),box-shadow 200ms var(--ease),border-color 200ms var(--ease);
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D6CFC4}
.card-body{padding:20px}
.card-body h3{font-size:19px;font-weight:700;line-height:1.45;letter-spacing:-.01em;margin-top:12px}
.card-body p{margin-top:10px;font-size:15px;line-height:1.85;color:var(--muted)}
.card-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px;padding-top:14px;border-top:1px solid var(--line)}
.card-meta time{font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--muted)}
.card:hover h3{color:var(--accent)}
.card:hover .arrow{transform:translateX(4px)}

/* ---------- hero ---------- */
.hero{padding:48px 0 56px;border-bottom:1px solid var(--line);background:var(--paper)}
.hero-grid{display:grid;gap:34px}
@media(min-width:1024px){
  .hero-grid{grid-template-columns:repeat(12,1fr);gap:40px;align-items:end}
  .hero-copy{grid-column:span 6}
  .hero-visual{grid-column:span 6;transform:translateY(18px)}
}
.hero h1{
  margin-top:18px;font-size:clamp(38px,6vw,72px);font-weight:800;line-height:1.06;
  letter-spacing:-.03em;
}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero-lead{margin-top:20px;font-size:18px;font-weight:500;color:var(--ink-2);max-width:44ch}
.hero-desc{margin-top:14px;font-size:15.5px;color:var(--muted);max-width:52ch}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-stats{display:flex;flex-wrap:wrap;gap:34px;margin-top:38px;padding-top:26px;border-top:1px solid var(--line)}
.hero-stats .stat strong{display:block;font-family:var(--font-num);font-size:32px;font-weight:800;letter-spacing:-.02em;line-height:1.1}
.hero-stats .stat span{display:block;margin-top:4px;font-size:13px;font-weight:600;letter-spacing:.1em;color:var(--muted)}
.hero-figure{position:relative}
.hero-figure .tag-float{
  position:absolute;left:18px;bottom:18px;background:var(--paper-2);border:1px solid var(--line);
  padding:8px 14px;border-radius:var(--radius);font-size:13px;font-weight:600;color:var(--ink)
}

/* ---------- quick facts ---------- */
.facts{display:grid;gap:20px}
@media(min-width:640px){.facts{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.facts{grid-template-columns:repeat(4,1fr)}}
.fact{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.fact .idx{font-family:var(--font-num);font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--accent)}
.fact h3{margin-top:14px;font-size:18px;font-weight:700;line-height:1.45}
.fact p{margin-top:10px;font-size:14.5px;line-height:1.8;color:var(--muted)}
.fact:hover{border-color:#D6CFC4;box-shadow:var(--shadow-hover);transform:translateY(-3px);transition:all 200ms var(--ease)}

/* ---------- falls (category2 signature) ---------- */
.falls{display:grid;gap:28px}
@media(min-width:768px){.falls{grid-template-columns:1fr 1fr;gap:32px}}
.falls-col{display:grid;gap:28px;align-content:start}
@media(min-width:768px){.falls-col.offset{padding-top:56px}}
.falls .card-body h3{font-size:20px}

/* ---------- steps ---------- */
.band-dark{background:var(--ink);color:#fff}
.band-dark .section-head h2{color:#fff}
.band-dark .section-head .sub{color:rgba(255,255,255,.66)}
.band-dark .eyebrow{color:rgba(255,255,255,.6)}
.steps{display:grid;gap:0;border-top:1px solid rgba(255,255,255,.14)}
@media(min-width:1024px){.steps{grid-template-columns:repeat(5,1fr)}}
.step{padding:26px 0;border-bottom:1px solid rgba(255,255,255,.14)}
@media(min-width:1024px){
  .step{border-bottom:0;border-right:1px solid rgba(255,255,255,.14);padding:30px 24px 30px 0}
  .step:last-child{border-right:0}
  .step+.step{padding-left:24px}
}
.step .no{font-family:var(--font-num);font-size:13px;font-weight:700;letter-spacing:.14em;color:var(--accent)}
.step h3{margin-top:14px;font-size:18px;font-weight:700;color:#fff}
.step p{margin-top:8px;font-size:14.5px;line-height:1.8;color:rgba(255,255,255,.66)}

/* ---------- metrics strip ---------- */
.metrics{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
@media(min-width:640px){.metrics{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.metrics{grid-template-columns:repeat(4,1fr)}}
.metric{background:var(--paper-2);padding:26px 22px}
.metric strong{display:block;font-family:var(--font-num);font-size:36px;font-weight:800;letter-spacing:-.02em;line-height:1.1}
.metric strong i{font-style:normal;font-size:16px;font-weight:700;color:var(--accent);margin-left:4px}
.metric span{display:block;margin-top:8px;font-size:13px;font-weight:600;letter-spacing:.1em;color:var(--muted)}
.metric p{margin-top:12px;font-size:14.5px;color:var(--muted);line-height:1.8}

/* ---------- scenarios ---------- */
.scene-grid{display:grid;gap:24px}
@media(min-width:768px){.scene-grid{grid-template-columns:repeat(3,1fr)}}
.scene{border-left:2px solid var(--accent-2);padding:4px 0 4px 20px}
.scene h3{font-size:18px;font-weight:700}
.scene p{margin-top:10px;font-size:15px;color:var(--muted)}

/* ---------- faq ---------- */
.faq{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line);border-left:2px solid transparent;transition:border-color 200ms var(--ease),padding 200ms var(--ease)}
.faq-item[open]{border-left-color:var(--accent);padding-left:18px}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:flex-start;justify-content:space-between;gap:20px;
  padding:22px 0;font-size:17px;font-weight:600;line-height:1.6;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--accent)}
.faq-item summary .sign{flex:0 0 auto;font-family:var(--font-num);font-size:20px;font-weight:700;color:var(--accent);line-height:1.2}
.faq-panel{padding:0 0 24px;max-width:76ch;font-size:15.5px;line-height:1.9;color:var(--muted)}

/* ---------- related ---------- */
.related-grid{display:grid;gap:24px}
@media(min-width:768px){.related-grid{grid-template-columns:repeat(3,1fr)}}
.related-card{
  display:flex;flex-direction:column;justify-content:space-between;gap:20px;
  background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:24px;
  transition:transform 200ms var(--ease),box-shadow 200ms var(--ease),border-color 200ms var(--ease);
}
.related-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover);border-color:#D6CFC4}
.related-card h3{margin-top:14px;font-size:20px;font-weight:700}
.related-card p{margin-top:10px;font-size:14.5px;color:var(--muted)}
.related-card:hover h3{color:var(--accent)}
.related-card:hover .arrow{transform:translateX(4px)}

/* ---------- CTA ---------- */
.cta{background:var(--ink);color:#fff;padding:64px 0}
@media(min-width:1024px){.cta{padding:88px 0}}
.cta-inner{max-width:760px}
.cta h2{font-size:clamp(26px,3.4vw,42px);font-weight:800;line-height:1.18;letter-spacing:-.02em}
.cta p{margin-top:16px;font-size:16px;color:rgba(255,255,255,.7);max-width:56ch}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.share-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:34px;padding-top:24px;border-top:1px solid rgba(255,255,255,.16)}
.share-row span{font-size:13px;letter-spacing:.1em;color:rgba(255,255,255,.55);font-weight:600}
.share-btn{
  display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;
  border:1px solid rgba(255,255,255,.24);border-radius:var(--radius);font-size:13px;color:rgba(255,255,255,.8);
  transition:all 200ms var(--ease);cursor:pointer;
}
.share-btn:hover{border-color:var(--accent);color:#fff;background:var(--accent)}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.72);padding:64px 0 28px}
.footer-grid{display:grid;gap:36px}
@media(min-width:768px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}}
.footer-brand .logo{margin-bottom:16px}
.footer-brand p{font-size:14.5px;line-height:1.85;max-width:34ch;color:rgba(255,255,255,.6)}
.footer-col h3{font-size:14px;font-weight:700;letter-spacing:.1em;color:#fff;margin-bottom:16px}
.footer-col li+li{margin-top:12px}
.footer-col a{font-size:14.5px;color:rgba(255,255,255,.72)}
.footer-col a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;
  margin-top:48px;padding-top:22px;border-top:1px solid rgba(255,255,255,.14);
  font-size:13.5px;color:rgba(255,255,255,.55);
}
.reveal{opacity:0;transform:translateY(12px);transition:opacity 500ms var(--ease),transform 500ms var(--ease)}
.reveal.is-in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* roulang page: category3 */
:root{
  --paper:#F7F5F1;
  --paper-2:#FFFFFF;
  --paper-3:#F1EEE8;
  --ink:#14161A;
  --ink-2:#2A2E36;
  --line:#E4DFD7;
  --accent:#FF4B1F;
  --accent-2:#0F7A6B;
  --muted:#6E7076;
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-hover:0 12px 32px rgba(20,22,26,.08);
  --font-cn:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-num:'Inter','Helvetica Neue',Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-cn);font-size:16.5px;line-height:1.95;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.02em;line-height:1.2}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
.container{width:100%;max-width:1280px;margin:0 auto;padding-left:20px;padding-right:20px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ============ 头部导航 ============ */
.site-header{position:sticky;top:0;z-index:60}
.brand-bar{background:var(--paper);border-bottom:1px solid var(--line)}
.brand-inner{position:relative;display:flex;align-items:center;gap:32px;height:76px}
.logo{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{width:34px;height:34px;display:grid;place-items:center;background:var(--ink);color:#fff;border-radius:var(--radius);font-weight:800;font-size:16px;line-height:1}
.logo-text{font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--ink)}
.main-nav{display:flex;align-items:center;gap:28px}
.nav-link{position:relative;display:inline-block;padding:6px 0;font-size:15.5px;font-weight:600;color:var(--ink-2);white-space:nowrap;transition:color 200ms var(--ease)}
.nav-link::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;background:var(--accent);transition:right 200ms var(--ease)}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after{right:0}
.nav-link.is-active{color:var(--ink)}
.nav-link.is-active::after{right:0}
.brand-actions{margin-left:auto;display:flex;align-items:center;gap:20px;flex-shrink:0}
.text-link{position:relative;font-size:15px;font-weight:600;color:var(--ink-2);transition:color 200ms var(--ease)}
.text-link:hover{color:var(--accent)}
.nav-toggle{display:none;margin-left:auto;width:44px;height:44px;flex-direction:column;justify-content:center;align-items:center;gap:4px;background:transparent;border:1px solid var(--line);border-radius:var(--radius);cursor:pointer}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink)}
.channel-bar{background:var(--paper-3);border-bottom:1px solid var(--line)}
.channel-inner{display:flex;align-items:center;gap:16px;min-height:56px}
.channel-label{flex-shrink:0;font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--muted)}
.channel-tags{display:flex;gap:10px;overflow-x:auto;scroll-snap-type:x proximity;padding:9px 0;scrollbar-width:none}
.channel-tags::-webkit-scrollbar{display:none}
.channel-tag{flex:0 0 auto;scroll-snap-align:start;padding:6px 16px;border:1px solid var(--line);border-radius:999px;background:var(--paper-2);font-size:14px;font-weight:600;color:var(--ink-2);white-space:nowrap;transition:color 200ms var(--ease),border-color 200ms var(--ease),background 200ms var(--ease)}
.channel-tag:hover{color:var(--accent);border-color:var(--accent)}
.channel-tag.is-active{background:var(--ink);border-color:var(--ink);color:#fff}

/* ============ 按钮 / 标签 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;height:52px;padding:0 27px;border:1px solid transparent;border-radius:var(--radius);font-size:15px;font-weight:700;cursor:pointer;transition:background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),transform 200ms var(--ease)}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.btn-light{background:#fff;color:var(--ink)}
.btn-light:hover{background:var(--accent);color:#fff;transform:translateY(-2px)}
.btn-outline-light{background:transparent;border-color:rgba(255,255,255,.5);color:#fff}
.btn-outline-light:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.btn-sm{height:44px;padding:0 20px;font-size:14.5px}
.badge{display:inline-flex;align-items:center;gap:6px;padding:3px 12px;border:1px solid var(--line);border-radius:999px;font-size:12px;font-weight:600;letter-spacing:.02em;color:var(--accent-2);background:var(--paper-2);white-space:nowrap}
.badge.is-live{color:var(--accent);border-color:rgba(255,75,31,.4)}
.badge.is-soon{color:var(--muted)}

/* ============ Hero ============ */
.hero{position:relative;background:var(--ink);color:#fff;overflow:hidden;padding:64px 0 0}
.hero-bg{position:absolute;inset:0;background-image:url('/assets/images/backpic/back-3.webp');background-size:cover;background-position:center;opacity:.3}
.hero-mask{position:absolute;inset:0;background:rgba(20,22,26,.74)}
.hero-inner{position:relative;z-index:2;max-width:820px}
.hero-tag{display:inline-flex;align-items:center;padding:5px 14px;border:1px solid rgba(255,255,255,.28);border-radius:999px;font-size:12.5px;font-weight:700;letter-spacing:.12em;color:#fff}
.hero h1{margin-top:22px;font-size:clamp(32px,5vw,58px);font-weight:800;line-height:1.06;letter-spacing:-.03em;color:#fff}
.hero-lead{margin-top:16px;font-size:clamp(17px,2vw,21px);font-weight:600;color:#fff}
.hero-desc{margin-top:14px;max-width:660px;font-size:16px;line-height:1.9;color:rgba(255,255,255,.72)}
.hero-meta{margin-top:18px;font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--accent)}
.hero-actions{margin-top:30px;display:flex;flex-wrap:wrap;gap:14px}
.hero-stats{position:relative;z-index:2;margin-top:52px;display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid rgba(255,255,255,.16)}
.stat{padding:22px 20px 22px 0}
.stat:nth-child(2n){padding-left:20px;border-left:1px solid rgba(255,255,255,.16)}
.stat-num{font-size:32px;font-weight:800;line-height:1;color:#fff}
.stat-num span{font-size:16px;font-weight:700;color:var(--accent);margin-left:2px}
.stat-label{margin-top:8px;font-size:13px;font-weight:600;letter-spacing:.08em;color:rgba(255,255,255,.6)}

/* ============ 通用板块 ============ */
.section{padding:56px 0}
.section-alt{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:36px}
.eyebrow{display:block;font-size:12.5px;font-weight:700;letter-spacing:.16em;color:var(--accent-2)}
.section-title{margin-top:12px;font-size:clamp(26px,3.4vw,40px);font-weight:700;letter-spacing:-.03em}
.section-sub{margin-top:10px;max-width:640px;font-size:15.5px;line-height:1.85;color:var(--muted)}

/* ============ 活动长条列表 ============ */
.act-list{border-top:1px solid var(--line)}
.act-row{display:grid;grid-template-columns:104px 1fr 20px;gap:18px;align-items:start;padding:22px 0;border-bottom:1px solid var(--line);transition:background 200ms var(--ease)}
.act-row:hover{background:var(--paper-2)}
.act-thumb{display:block;width:100%;aspect-ratio:1/1;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-3)}
.act-thumb img{width:100%;height:100%;object-fit:cover;transition:transform 320ms var(--ease)}
.act-row:hover .act-thumb img{transform:scale(1.03)}
.act-body{min-width:0;display:block}
.act-tags{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.act-time{font-size:13px;font-weight:600;letter-spacing:.05em;color:var(--muted)}
.act-index{font-size:12px;font-weight:700;letter-spacing:.12em;color:var(--accent)}
.act-title{margin-top:10px;font-size:18px;font-weight:700;line-height:1.45;transition:color 200ms var(--ease)}
.act-row:hover .act-title{color:var(--accent)}
.act-desc{margin-top:8px;max-width:760px;font-size:15px;line-height:1.85;color:var(--muted)}
.act-arrow{align-self:center;font-size:18px;color:var(--muted);transition:transform 200ms var(--ease),color 200ms var(--ease)}
.act-row:hover .act-arrow{transform:translateX(4px);color:var(--accent)}

/* ============ 参与流程 ============ */
.flow{display:grid;gap:20px}
.flow-step{position:relative;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:24px 22px;transition:transform 200ms var(--ease),box-shadow 200ms var(--ease)}
.flow-step:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.flow-num{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--accent)}
.flow-step h3{margin-top:12px;font-size:17px;font-weight:700}
.flow-step p{margin-top:8px;font-size:14.5px;line-height:1.85;color:var(--muted)}

/* ============ FAQ ============ */
.faq{border-top:1px solid var(--line)}
.faq-item{position:relative;border-bottom:1px solid var(--line);padding-left:0;transition:padding-left 220ms var(--ease)}
.faq-item summary{list-style:none;cursor:pointer;padding:22px 44px 22px 0;font-size:17px;font-weight:600;color:var(--ink)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:6px;top:50%;transform:translateY(-50%);font-size:22px;font-weight:400;line-height:1;color:var(--muted);transition:color 200ms var(--ease)}
.faq-item[open] summary::after{content:"−";color:var(--accent)}
.faq-item[open]{padding-left:18px}
.faq-item[open]::before{content:"";position:absolute;left:0;top:18px;bottom:18px;width:2px;background:var(--accent)}
.faq-answer{padding:0 44px 24px 0;font-size:15.5px;line-height:1.9;color:var(--muted)}

/* ============ 相关分类 ============ */
.related-grid{display:grid;gap:20px}
.rel-card{display:flex;flex-direction:column;height:100%;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform 200ms var(--ease),box-shadow 200ms var(--ease)}
.rel-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.rel-cover{aspect-ratio:16/9;overflow:hidden;background:var(--paper-3)}
.rel-cover img{width:100%;height:100%;object-fit:cover;transition:transform 320ms var(--ease)}
.rel-card:hover .rel-cover img{transform:scale(1.03)}
.rel-body{display:flex;flex-direction:column;gap:12px;flex:1;padding:22px}
.rel-body h3{font-size:19px;font-weight:700;line-height:1.45;transition:color 200ms var(--ease)}
.rel-card:hover .rel-body h3{color:var(--accent)}
.rel-body p{font-size:14.5px;line-height:1.85;color:var(--muted)}
.rel-foot{margin-top:auto;padding-top:16px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:13px;font-weight:600;letter-spacing:.05em;color:var(--muted)}
.rel-foot span:last-child{color:var(--accent)}

/* ============ CTA ============ */
.cta{background:var(--ink);color:#fff;padding:64px 0}
.cta-inner{max-width:780px;margin:0 auto;text-align:center}
.cta h2{font-size:clamp(26px,3.4vw,42px);font-weight:800;letter-spacing:-.03em;color:#fff}
.cta p{margin-top:14px;font-size:16px;line-height:1.9;color:rgba(255,255,255,.7)}
.cta-actions{margin-top:30px;display:flex;justify-content:center;flex-wrap:wrap;gap:14px}
.share-row{margin-top:30px;display:flex;justify-content:center;gap:12px}
.share-btn{width:44px;height:44px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.24);border-radius:var(--radius);background:transparent;color:#fff;font-size:15px;cursor:pointer;transition:border-color 200ms var(--ease),color 200ms var(--ease),transform 200ms var(--ease)}
.share-btn:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.share-note{margin-top:14px;font-size:13px;letter-spacing:.06em;color:rgba(255,255,255,.45)}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink);color:#fff;padding:64px 0 28px}
.footer-grid{display:grid;gap:36px;grid-template-columns:1fr}
.footer-brand .logo-text{color:#fff}
.footer-brand p{margin-top:16px;max-width:340px;font-size:14.5px;line-height:1.9;color:rgba(255,255,255,.62)}
.footer-col h3{margin-bottom:16px;font-size:13px;font-weight:700;letter-spacing:.12em;color:rgba(255,255,255,.55)}
.footer-col li+li{margin-top:10px}
.footer-col a{font-size:15px;color:rgba(255,255,255,.82);transition:color 200ms var(--ease)}
.footer-col a:hover{color:var(--accent);text-decoration:underline}
.footer-bottom{margin-top:52px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:13px;letter-spacing:.04em;color:rgba(255,255,255,.5)}

/* ============ 入场动效 ============ */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 560ms var(--ease),transform 560ms var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (min-width:640px){
  .act-row{grid-template-columns:140px 1fr 24px;gap:24px;padding:26px 0}
}
@media (min-width:768px){
  .container{padding-left:24px;padding-right:24px}
  .section{padding:80px 0}
  .flow{grid-template-columns:repeat(2,1fr)}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.6fr 1fr 1fr;gap:32px}
}
@media (min-width:1024px){
  .container{padding-left:40px;padding-right:40px}
  .section{padding:112px 0}
  .act-row{grid-template-columns:160px 1fr 24px;gap:28px;padding:28px 0}
  .act-thumb{aspect-ratio:1/1}
  .flow{grid-template-columns:repeat(4,1fr)}
  .related-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px}
  .cta{padding:88px 0}
  .hero{padding-top:84px}
}
@media (min-width:900px){
  .hero-stats{grid-template-columns:repeat(4,1fr)}
  .stat{padding:26px 24px 26px 0;border-top:0}
  .stat:not(:first-child){border-left:1px solid rgba(255,255,255,.16);padding-left:24px}
}
@media (max-width:899px){
  .stat:nth-child(n+3){border-top:1px solid rgba(255,255,255,.14)}
}
@media (max-width:1023px){
  .main-nav{position:absolute;top:100%;left:0;right:0;display:none;flex-direction:column;align-items:stretch;gap:0;padding:6px 20px 16px;background:var(--paper-2);border-bottom:1px solid var(--line);box-shadow:var(--shadow-hover)}
  .main-nav.is-open{display:flex}
  .nav-link{padding:13px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav-link::after{display:none}
  .nav-link.is-active{color:var(--accent)}
  .brand-actions{display:none}
  .nav-toggle{display:flex}
}
@media (max-width:639px){
  .act-row{grid-template-columns:96px 1fr;gap:16px}
  .act-arrow{display:none}
  .hero{padding-top:48px}
  .hero-actions .btn{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category4 */
:root{
    --paper:#F7F5F1;
    --paper-2:#FFFFFF;
    --ink:#14161A;
    --ink-2:#2A2E36;
    --line:#E4DFD7;
    --accent:#FF4B1F;
    --accent-2:#0F7A6B;
    --muted:#6E7076;
    --radius:2px;
    --shadow:0 12px 32px rgba(20,22,26,.08);
    --ease:cubic-bezier(.22,.61,.36,1);
    --font-cn:'Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
    --font-num:'Inter','Helvetica Neue',Arial,sans-serif;
  }
  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
  html body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:var(--font-cn);
    font-size:16.5px;
    line-height:1.95;
    font-weight:400;
    -webkit-font-smoothing:antialiased;
  }
  .num{font-family:var(--font-num);font-variant-numeric:tabular-nums;}
  a{color:inherit;text-decoration:none;}
  img{display:block;max-width:100%;height:auto;}
  button,input,textarea{font:inherit;color:inherit;}
  ul,ol{margin:0;padding:0;list-style:none;}
  ::selection{background:var(--accent);color:#fff;}
  :focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
  ::-webkit-scrollbar{width:10px;height:10px;}
  ::-webkit-scrollbar-track{background:var(--paper);}
  ::-webkit-scrollbar-thumb{background:#D6D0C6;border-radius:2px;}
  ::-webkit-scrollbar-thumb:hover{background:var(--muted);}

  .container{width:100%;max-width:1280px;margin:0 auto;padding:0 20px;}
  @media (min-width:768px){.container{padding:0 24px;}}
  @media (min-width:1024px){.container{padding:0 40px;}}

  .section{padding:56px 0;}
  @media (min-width:768px){.section{padding:80px 0;}}
  @media (min-width:1024px){.section{padding:112px 0;}}
  .section-tight{padding:48px 0;}
  @media (min-width:1024px){.section-tight{padding:72px 0;}}

  /* ---------- 头部 ---------- */
  .site-header{position:sticky;top:0;z-index:60;background:var(--paper-2);border-bottom:1px solid var(--line);}
  .brand-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:76px;}
  .logo{display:inline-flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.01em;}
  .logo-mark{width:32px;height:32px;display:grid;place-items:center;background:var(--ink);color:#fff;font-size:15px;font-weight:800;border-radius:var(--radius);}
  .logo-text{font-size:17px;}
  .main-nav{display:none;align-items:center;gap:2px;}
  @media (min-width:1024px){.main-nav{display:flex;}}
  .nav-link{position:relative;padding:10px 12px;font-size:15px;font-weight:600;color:var(--ink-2);transition:color 200ms var(--ease);}
  .nav-link::after{content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform 200ms var(--ease);}
  .nav-link:hover{color:var(--accent);}
  .nav-link:hover::after{transform:scaleX(1);}
  .nav-link.is-active{color:var(--ink);}
  .nav-link.is-active::after{transform:scaleX(1);}
  .brand-actions{display:flex;align-items:center;gap:14px;}
  .link-quiet{display:none;font-size:14.5px;font-weight:600;color:var(--ink-2);position:relative;transition:color 200ms var(--ease);}
  .link-quiet::after{content:"";position:absolute;left:0;bottom:-3px;width:100%;height:1px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform 200ms var(--ease);}
  .link-quiet:hover{color:var(--accent);}
  .link-quiet:hover::after{transform:scaleX(1);}
  @media (min-width:768px){.link-quiet{display:inline-block;}}
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-2);cursor:pointer;transition:border-color 200ms var(--ease),color 200ms var(--ease);}
  .nav-toggle:hover{border-color:var(--accent);color:var(--accent);}
  @media (min-width:1024px){.nav-toggle{display:none;}}
  .mobile-nav{display:none;border-top:1px solid var(--line);background:var(--paper-2);padding:8px 0 16px;}
  .mobile-nav.is-open{display:block;}
  .mobile-nav a{display:block;padding:13px 0;border-bottom:1px solid var(--line);font-size:15.5px;font-weight:600;color:var(--ink-2);}
  .mobile-nav a:last-child{border-bottom:0;}
  .mobile-nav a.is-active{color:var(--accent);}
  @media (min-width:1024px){.mobile-nav{display:none !important;}}

  .channel-bar{background:var(--paper);border-bottom:1px solid var(--line);}
  .channel-inner{display:flex;align-items:center;gap:14px;min-height:56px;padding-top:8px;padding-bottom:8px;}
  .channel-label{flex:0 0 auto;font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--muted);}
  .channel-nav{display:flex;gap:8px;overflow-x:auto;scroll-snap-type:x mandatory;-ms-overflow-style:none;scrollbar-width:none;}
  .channel-nav::-webkit-scrollbar{display:none;}
  .channel-tag{flex:0 0 auto;scroll-snap-align:start;padding:7px 15px;border-radius:999px;border:1px solid var(--line);background:var(--paper-2);font-size:13.5px;font-weight:600;color:var(--ink-2);white-space:nowrap;transition:color 200ms var(--ease),border-color 200ms var(--ease),background 200ms var(--ease);}
  .channel-tag:hover{color:var(--accent);border-color:var(--accent);}
  .channel-tag.is-active{background:var(--ink);border-color:var(--ink);color:#fff;}

  /* ---------- 按钮 ---------- */
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:52px;padding:0 26px;border-radius:var(--radius);border:1px solid transparent;font-size:15.5px;font-weight:700;cursor:pointer;transition:background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),transform 200ms var(--ease);}
  .btn-sm{height:42px;padding:0 18px;font-size:14.5px;}
  .btn-primary{background:var(--ink);color:#fff;}
  .btn-primary:hover{background:var(--accent);transform:translateY(-2px);}
  .btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink);}
  .btn-ghost:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px);}
  .btn-invert{background:#fff;color:var(--ink);}
  .btn-invert:hover{background:var(--accent);color:#fff;transform:translateY(-2px);}
  .btn-outline-invert{background:transparent;border-color:rgba(255,255,255,.42);color:#fff;}
  .btn-outline-invert:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px);}
  .text-link{display:inline-flex;align-items:center;gap:6px;font-size:14.5px;font-weight:700;color:var(--ink);position:relative;transition:color 200ms var(--ease);}
  .text-link::after{content:"";position:absolute;left:0;bottom:-3px;width:100%;height:1px;background:currentColor;transform:scaleX(0);transform-origin:left;transition:transform 200ms var(--ease);}
  .text-link:hover{color:var(--accent);}
  .text-link:hover::after{transform:scaleX(1);}

  /* ---------- 标签 ---------- */
  .tag{display:inline-flex;align-items:center;gap:6px;padding:5px 12px;border-radius:999px;border:1px solid var(--line);background:var(--paper-2);font-size:12px;font-weight:700;letter-spacing:.08em;color:var(--accent-2);}
  .tag-dot{width:6px;height:6px;border-radius:50%;background:var(--accent-2);}

  /* ---------- Hero ---------- */
  .hero{background:var(--paper-2);border-bottom:1px solid var(--line);padding:40px 0 48px;}
  @media (min-width:1024px){.hero{padding:64px 0 80px;}}
  .hero-grid{display:grid;gap:40px;align-items:center;}
  @media (min-width:1024px){.hero-grid{grid-template-columns:7fr 5fr;gap:64px;}}
  .h1{font-size:clamp(34px,5.4vw,64px);line-height:1.06;font-weight:800;letter-spacing:-.03em;margin:16px 0 0;}
  .hero-sub{font-size:clamp(16px,1.5vw,18px);color:var(--ink-2);margin-top:18px;max-width:34em;}
  .hero-note{margin-top:14px;font-size:13px;font-weight:600;letter-spacing:.08em;color:var(--muted);}
  .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px;}
  .hero-stats{display:flex;flex-wrap:wrap;gap:32px;margin-top:36px;padding-top:24px;border-top:1px solid var(--line);}
  .stat-num{font-size:clamp(24px,2.8vw,32px);font-weight:800;letter-spacing:-.02em;line-height:1.2;}
  .stat-label{font-size:13px;font-weight:600;letter-spacing:.1em;color:var(--muted);}
  .hero-media{position:relative;overflow:hidden;border-radius:var(--radius);border:1px solid var(--line);aspect-ratio:16/10;background:#EDE9E2;}
  .hero-media img{width:100%;height:100%;object-fit:cover;}
  .hero-badge{position:absolute;left:16px;bottom:16px;right:16px;display:flex;align-items:center;justify-content:space-between;gap:12px;background:rgba(20,22,26,.88);color:#fff;padding:12px 16px;border-radius:var(--radius);font-size:13px;font-weight:600;letter-spacing:.04em;}

  .breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--muted);}
  .breadcrumb a:hover{color:var(--accent);}
  .breadcrumb .sep{color:#C6C0B6;}

  .bar-title{position:relative;padding-left:16px;}
  .bar-title::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:3px;background:var(--accent);}
  .h2{font-size:clamp(24px,3.2vw,38px);line-height:1.15;font-weight:700;letter-spacing:-.02em;}
  .h3{font-size:20px;line-height:1.35;font-weight:700;}
  .section-desc{margin-top:12px;font-size:15px;color:var(--muted);max-width:46em;}
  .section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:36px;}

  /* ---------- 双列对照 ---------- */
  .compare-grid{display:grid;gap:40px;}
  @media (min-width:1024px){.compare-grid{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:56px;align-items:start;}}
  .rule-list{border-top:1px solid var(--line);}
  .rule-item{display:grid;grid-template-columns:52px minmax(0,1fr);gap:16px;padding:22px 4px;border-bottom:1px solid var(--line);transition:background 200ms var(--ease);}
  .rule-item:hover{background:var(--paper-2);}
  .rule-index{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--muted);padding-top:4px;transition:color 200ms var(--ease);}
  .rule-item:hover .rule-index{color:var(--accent);}
  .rule-title{font-size:18px;font-weight:700;letter-spacing:-.01em;transition:color 200ms var(--ease);}
  .rule-item:hover .rule-title{color:var(--accent);}
  .rule-text{margin-top:6px;font-size:15px;color:var(--muted);line-height:1.8;}

  .panel-stack{display:grid;gap:20px;}
  .panel{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:box-shadow 200ms var(--ease),transform 200ms var(--ease);}
  .panel:hover{box-shadow:var(--shadow);transform:translateY(-3px);}
  .panel-media{position:relative;overflow:hidden;border-radius:var(--radius);aspect-ratio:16/10;background:#EDE9E2;margin-bottom:18px;}
  .panel-media img{width:100%;height:100%;object-fit:cover;transition:transform 400ms var(--ease);}
  .panel:hover .panel-media img{transform:scale(1.03);}
  .panel-title{font-size:18px;font-weight:700;margin-top:14px;}
  .panel-text{margin-top:8px;font-size:14.8px;color:var(--muted);line-height:1.8;}
  .check-list li{position:relative;padding-left:20px;margin-top:12px;font-size:15px;color:var(--ink-2);line-height:1.8;}
  .check-list li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;background:var(--accent-2);border-radius:1px;}

  /* ---------- 深色流程区 ---------- */
  .dark-band{background:var(--ink);color:#fff;position:relative;overflow:hidden;}
  .dark-band::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,var(--accent),rgba(20,22,26,0));}
  .dark-band .h2{color:#fff;}
  .dark-band .section-desc{color:rgba(255,255,255,.66);}
  .step-grid{display:grid;gap:26px;}
  @media (min-width:640px){.step-grid{grid-template-columns:repeat(2,1fr);}}
  @media (min-width:1024px){.step-grid{grid-template-columns:repeat(4,1fr);gap:32px;}}
  .step{padding-top:20px;border-top:1px solid rgba(255,255,255,.18);}
  .step-num{font-size:13px;font-weight:700;letter-spacing:.18em;color:var(--accent);}
  .step-title{font-size:17px;font-weight:700;margin-top:12px;}
  .step-text{margin-top:8px;font-size:14.6px;line-height:1.85;color:rgba(255,255,255,.68);}
  .metric-row{display:grid;gap:28px;margin-top:56px;padding-top:32px;border-top:1px solid rgba(255,255,255,.18);}
  @media (min-width:768px){.metric-row{grid-template-columns:repeat(3,1fr);}}
  .metric-num{font-size:clamp(30px,4vw,46px);font-weight:800;letter-spacing:-.03em;line-height:1.1;color:#fff;}
  .metric-num em{font-style:normal;color:var(--accent);}
  .metric-label{margin-top:8px;font-size:13px;font-weight:600;letter-spacing:.1em;color:rgba(255,255,255,.6);}

  /* ---------- FAQ ---------- */
  .faq{border-top:1px solid var(--line);}
  .faq-item{border-bottom:1px solid var(--line);}
  .faq-q{list-style:none;cursor:pointer;display:flex;align-items:flex-start;justify-content:space-between;gap:24px;padding:22px 2px;font-size:17px;font-weight:600;color:var(--ink);transition:color 200ms var(--ease);}
  .faq-q::-webkit-details-marker{display:none;}
  .faq-q:hover{color:var(--accent);}
  .faq-icon{flex:0 0 auto;width:22px;height:22px;position:relative;margin-top:4px;}
  .faq-icon::before,.faq-icon::after{content:"";position:absolute;background:currentColor;transition:transform 200ms var(--ease),opacity 200ms var(--ease);}
  .faq-icon::before{left:0;top:10px;width:22px;height:1.5px;}
  .faq-icon::after{left:10px;top:0;width:1.5px;height:22px;}
  .faq-item[open] .faq-icon::after{transform:scaleY(0);opacity:0;}
  .faq-body{padding:0 0 26px 18px;border-left:2px solid var(--accent);font-size:15.5px;line-height:1.9;color:var(--ink-2);max-width:66em;}

  /* ---------- 相关分类卡片 ---------- */
  .rel-grid{display:grid;gap:24px;}
  @media (min-width:640px){.rel-grid{grid-template-columns:repeat(2,1fr);}}
  @media (min-width:1024px){.rel-grid{grid-template-columns:repeat(3,1fr);gap:28px;}}
  .card{display:flex;flex-direction:column;background:var(--paper-2);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform 200ms var(--ease),box-shadow 200ms var(--ease),border-color 200ms var(--ease);}
  .card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#D9D2C7;}
  .card-media{aspect-ratio:4/3;overflow:hidden;background:#EDE9E2;}
  .card-media img{width:100%;height:100%;object-fit:cover;transition:transform 400ms var(--ease);}
  .card:hover .card-media img{transform:scale(1.03);}
  .card-body{display:flex;flex-direction:column;gap:10px;padding:20px 22px 24px;flex:1;}
  .card-title{font-size:19px;font-weight:700;line-height:1.4;transition:color 200ms var(--ease);}
  .card:hover .card-title{color:var(--accent);}
  .card-text{font-size:14.6px;line-height:1.8;color:var(--muted);}
  .card-meta{margin-top:auto;padding-top:14px;display:flex;align-items:center;justify-content:space-between;font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--muted);}
  .arrow{transition:transform 200ms var(--ease);}
  .card:hover .arrow,.rule-item:hover .arrow{transform:translateX(4px);}

  /* ---------- CTA ---------- */
  .cta-band{background:var(--ink);color:#fff;text-align:center;}
  .cta-title{font-size:clamp(26px,4vw,44px);font-weight:800;letter-spacing:-.02em;line-height:1.12;}
  .cta-text{margin-top:16px;font-size:15.5px;color:rgba(255,255,255,.7);max-width:44em;margin-left:auto;margin-right:auto;}
  .cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:32px;}
  .share-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:32px;}
  .share-btn{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 16px;border:1px solid rgba(255,255,255,.28);border-radius:var(--radius);background:transparent;color:#fff;font-size:13.5px;font-weight:600;cursor:pointer;transition:border-color 200ms var(--ease),color 200ms var(--ease),transform 200ms var(--ease);}
  .share-btn:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px);}

  /* ---------- 页脚 ---------- */
  .site-footer{background:var(--ink);color:rgba(255,255,255,.72);padding:48px 0 28px;}
  @media (min-width:1024px){.site-footer{padding:80px 0 32px;}}
  .footer-grid{display:grid;gap:36px;}
  @media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
  @media (min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:48px;}}
  .footer-brand .logo{color:#fff;}
  .footer-brand .logo-mark{background:#fff;color:var(--ink);}
  .footer-brand p{margin-top:16px;font-size:14.5px;line-height:1.85;max-width:34em;color:rgba(255,255,255,.66);}
  .footer-col h3{font-size:13px;font-weight:700;letter-spacing:.14em;color:#fff;margin:0 0 16px;}
  .footer-col ul{display:grid;gap:11px;}
  .footer-col a{font-size:14.5px;color:rgba(255,255,255,.72);transition:color 200ms var(--ease);}
  .footer-col a:hover{color:var(--accent);text-decoration:underline;}
  .footer-bottom{margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.14);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.5);}

  /* ---------- 入场动效 ---------- */
  .reveal{opacity:0;transform:translateY(12px);transition:opacity 500ms var(--ease),transform 500ms var(--ease);}
  .reveal.is-in{opacity:1;transform:none;}
  @media (prefers-reduced-motion:reduce){
    html{scroll-behavior:auto;}
    *,*::before,*::after{transition:none !important;animation:none !important;}
    .reveal{opacity:1;transform:none;}
  }