/* =========================================================
   高济华北 · 内部资源平台  —  shared design system
   2026-10-24
   ========================================================= */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC","Helvetica Neue",sans-serif;
  background:var(--bg);color:var(--ink);font-size:14px;line-height:1.65;min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button,input,select{font:inherit}
button{cursor:pointer}
::selection{background:rgba(200,16,46,.16)}

:root{
  --brand:#c8102e;
  --brand-2:#e63950;
  --brand-dark:#9d0b23;
  --brand-soft:#fdeef1;
  --accent:#0f766e;
  --accent-soft:#e7f5f2;
  --ink:#1c1f23;
  --ink-2:#5c636d;
  --ink-3:#8b919a;
  --bg:#f6f4ef;
  --surface:#ffffff;
  --surface-2:#fbfaf7;
  --line:#e9e4db;
  --line-2:#f0ece5;
  --shadow-sm:0 1px 2px rgba(28,31,35,.04);
  --shadow:0 10px 34px rgba(28,31,35,.07);
  --radius:16px;
  --radius-sm:12px;
  --container:1200px;
}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.muted{color:var(--ink-2)}
.small{font-size:12.5px}
.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}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:12px;padding:11px 20px;font-size:14px;font-weight:600;
  border:1px solid transparent;transition:transform .18s ease, box-shadow .18s ease, background .18s ease, color .18s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 8px 20px rgba(200,16,46,.22)}
.btn-primary:hover{box-shadow:0 12px 26px rgba(200,16,46,.28)}
.btn-ghost{background:rgba(255,255,255,.7);color:var(--ink-2);border-color:var(--line)}
.btn-ghost:hover{color:var(--ink);border-color:#d8d2c7;background:#fff}
.btn-dark{background:var(--ink);color:#fff}
.btn-sm{padding:8px 14px;font-size:13px;border-radius:10px}
.btn-block{width:100%}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.88);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-2);
}
.header-inner{max-width:var(--container);margin:0 auto;padding:0 24px;height:66px;display:flex;align-items:center;gap:24px}
.logo{display:flex;align-items:center;gap:11px;flex-shrink:0}
.logo-mark{
  width:36px;height:36px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;
  font-size:16px;font-weight:800;letter-spacing:.5px;box-shadow:0 6px 14px rgba(200,16,46,.22)
}
.logo-copy{display:flex;flex-direction:column;line-height:1.15}
.logo-copy b{font-size:15px;letter-spacing:.3px}
.logo-copy span{font-size:10.5px;color:var(--ink-3);letter-spacing:1.6px;font-weight:600}
.nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav a{padding:9px 14px;border-radius:999px;font-size:13.5px;color:var(--ink-2);transition:all .18s}
.nav a:hover{background:var(--bg);color:var(--ink)}
.nav a.active{background:var(--brand-soft);color:var(--brand);font-weight:650}
.header-actions{display:flex;align-items:center;gap:8px;margin-left:6px}
.user-chip{display:none;align-items:center;gap:7px;padding:7px 12px;border-radius:999px;background:var(--bg);font-size:12.5px;color:var(--ink-2)}
.user-chip.show{display:inline-flex}
.user-chip i{width:6px;height:6px;border-radius:50%;background:#16a34a;display:block}
.hamburger{display:none;border:0;background:none;font-size:22px;line-height:1;color:var(--ink-2);padding:6px}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line-2)}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(900px 420px at 8% -10%,rgba(200,16,46,.08),transparent 62%),
    radial-gradient(800px 420px at 102% 18%,rgba(15,118,110,.09),transparent 58%),
    linear-gradient(180deg,#fbf9f5 0%,var(--bg) 100%);
}
.hero::after{
  content:"";position:absolute;right:-4%;top:-18%;width:52%;height:135%;
  background:url(/images/hero-1920.webp) center/cover no-repeat;
  opacity:.09;filter:saturate(.8);pointer-events:none;
  -webkit-mask-image:linear-gradient(90deg,transparent 0%,#000 38%,#000 100%);
  mask-image:linear-gradient(90deg,transparent 0%,#000 38%,#000 100%);
}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding-top:64px;padding-bottom:64px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.72);border:1px solid var(--line);font-size:11.5px;font-weight:650;letter-spacing:.6px;color:var(--ink-2)}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px rgba(200,16,46,.1)}
.hero h1{font-size:clamp(30px,4.2vw,48px);line-height:1.16;letter-spacing:-.5px;margin:18px 0 14px;font-weight:800;color:#181b1f}
.hero h1 em{font-style:normal;color:var(--brand)}
.hero-copy p.lead{font-size:15px;color:var(--ink-2);max-width:520px;margin:0 0 26px;line-height:1.8}
.hero-cta{display:flex;gap:10px;flex-wrap:wrap}
.hero-tags{display:flex;gap:18px;flex-wrap:wrap;margin-top:26px;color:var(--ink-3);font-size:12.5px}
.hero-tags span{display:inline-flex;align-items:center;gap:6px}
.hero-tags b{color:var(--ink);font-size:14px}

.hero-panel{
  background:rgba(255,255,255,.78);border:1px solid var(--line);border-radius:20px;
  padding:22px;box-shadow:var(--shadow);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)
}
.panel-head{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--ink-3);letter-spacing:.4px}
.live{display:inline-flex;align-items:center;gap:6px;color:#15803d;font-weight:600}
.live i{width:6px;height:6px;border-radius:50%;background:#16a34a;box-shadow:0 0 0 4px rgba(22,163,74,.12);animation:pulse 2.4s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.panel-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:18px 0}
.panel-stat{background:var(--surface-2);border:1px solid var(--line-2);border-radius:12px;padding:14px 10px;text-align:center}
.panel-stat b{display:block;font-size:24px;line-height:1.1;font-weight:800;color:#20242a;font-variant-numeric:tabular-nums}
.panel-stat span{font-size:11px;color:var(--ink-3)}
.panel-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line-2)}
.panel-list li{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 2px;border-bottom:1px solid var(--line-2);font-size:12.5px;color:var(--ink-2)}
.panel-list li:last-child{border-bottom:0}
.panel-list .tag{font-size:10.5px;padding:2px 8px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-weight:650}
.panel-foot{margin-top:14px;font-size:11px;color:var(--ink-3);display:flex;justify-content:space-between}

/* ---------- sections ---------- */
.section{padding:64px 0 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:26px}
.kicker{margin:0 0 4px;font-size:11px;letter-spacing:2px;font-weight:700;color:var(--brand)}
.section-head h2{margin:0;font-size:clamp(22px,2.6vw,28px);letter-spacing:-.3px}
.section-head p{margin:0;color:var(--ink-2);font-size:13px;max-width:440px}
.section-head a{color:var(--brand);font-size:13px;font-weight:650;white-space:nowrap}

/* ---------- service cards ---------- */
.service-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr;gap:14px}
.service-card{
  position:relative;display:flex;flex-direction:column;gap:10px;min-height:210px;
  background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:24px;
  transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;overflow:hidden
}
.service-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#ded7cb}
.service-card .icon{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:22px;background:var(--bg);margin-bottom:4px}
.service-card h3{margin:0;font-size:17px;letter-spacing:-.2px}
.service-card p{margin:0;font-size:13px;color:var(--ink-2);line-height:1.7}
.service-card .go{margin-top:auto;display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:650;color:var(--brand)}
.service-card .go span{transition:transform .2s}
.service-card:hover .go span{transform:translateX(4px)}
.service-card.feature{
  background:linear-gradient(140deg,#a80d27 0%,#c8102e 52%,#e0485d 100%);
  color:#fff;border-color:transparent;box-shadow:0 18px 40px rgba(168,13,39,.18)
}
.service-card.feature .icon{background:rgba(255,255,255,.16);color:#fff}
.service-card.feature p{color:rgba(255,255,255,.82)}
.service-card.feature .go{color:#fff}
.service-card.feature .chips{margin-top:14px;display:flex;gap:6px;flex-wrap:wrap}
.service-card.feature .chips span{font-size:11px;padding:3px 9px;border-radius:999px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.18)}
.soon{position:absolute;top:16px;right:16px;font-size:10.5px;padding:3px 9px;border-radius:999px;background:var(--bg);color:var(--ink-3);border:1px solid var(--line)}

/* ---------- app grid ---------- */
.app-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.app-card{
  background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px;
  display:flex;flex-direction:column;gap:14px;transition:transform .2s,box-shadow .2s,border-color .2s
}
.app-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#ded7cb}
.app-top{display:flex;gap:12px;align-items:flex-start}
.app-icon{width:46px;height:46px;flex:0 0 46px;border-radius:13px;background:linear-gradient(160deg,#faf7f1,#f1ece3);display:grid;place-items:center;font-size:22px;border:1px solid var(--line-2)}
.app-info{min-width:0;flex:1}
.app-name{font-size:14.5px;font-weight:700;letter-spacing:.1px;display:flex;align-items:center;gap:6px}
.app-name .hot{font-size:9.5px;font-weight:700;color:var(--brand);background:var(--brand-soft);padding:1px 6px;border-radius:999px;letter-spacing:.4px}
.app-desc{font-size:12.5px;color:var(--ink-2);margin-top:3px;line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:39px}
.app-meta{display:flex;gap:10px;flex-wrap:wrap;font-size:11.5px;color:var(--ink-3);margin-top:8px}
.app-meta span{display:inline-flex;align-items:center;gap:4px}
.app-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;border-top:1px dashed var(--line-2);padding-top:12px;margin-top:auto}
.app-date{font-size:11px;color:var(--ink-3)}
.app-type{font-size:10.5px;padding:2px 7px;border-radius:999px;border:1px solid var(--line);color:var(--ink-3)}
.app-type.ext{color:var(--accent);border-color:#cde9e4;background:var(--accent-soft)}

/* ---------- stats band ---------- */
.stats-band{margin-top:56px;background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:26px 30px;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;box-shadow:var(--shadow-sm)}
.stat b{display:block;font-size:clamp(24px,3vw,32px);font-weight:800;letter-spacing:-.5px;line-height:1.1;font-variant-numeric:tabular-nums}
.stat b i{font-style:normal;color:var(--brand);font-size:.62em;margin-left:2px}
.stat span{font-size:12.5px;color:var(--ink-3)}
.stat + .stat{border-left:1px solid var(--line-2);padding-left:18px}

/* ---------- quick links ---------- */
.link-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.link-item{display:flex;align-items:center;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 18px;transition:all .18s}
.link-item:hover{border-color:#ddd6ca;transform:translateY(-1px);box-shadow:var(--shadow-sm)}
.link-item .li-icon{width:38px;height:38px;border-radius:11px;background:var(--bg);display:grid;place-items:center;font-size:18px;flex:0 0 38px}
.link-item .li-name{font-size:13.5px;font-weight:650}
.link-item .li-desc{font-size:11.5px;color:var(--ink-3)}
.link-item .arrow{margin-left:auto;color:var(--ink-3)}

/* ---------- footer ---------- */
.site-footer{margin-top:72px;background:#171a1e;color:#c4c8ce;padding:44px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.4fr .9fr .9fr 1.1fr;gap:32px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700}
.footer-brand .logo-mark{width:32px;height:32px;border-radius:9px;font-size:14px}
.footer-desc{font-size:12.5px;color:#8f969f;margin:12px 0 0;max-width:340px;line-height:1.8}
.footer-title{font-size:11px;letter-spacing:1.6px;color:#7b828b;font-weight:700;margin:0 0 12px}
.footer-links{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:12.5px}
.footer-links a:hover{color:#fff}
.footer-bottom{margin-top:32px;padding-top:18px;border-top:1px solid #2a2e34;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:11.5px;color:#7f868f}
.footer-bottom a{color:#aeb4bc}
.footer-bottom a:hover{color:#fff}

/* ---------- page hero (inner pages) ---------- */
.page-hero{padding:46px 0 26px;border-bottom:1px solid var(--line-2);background:linear-gradient(180deg,#fbf9f5,rgba(251,249,245,0))}
.crumb{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--ink-3);margin-bottom:12px}
.crumb a:hover{color:var(--brand)}
.crumb span{color:var(--line)}
.page-title{display:flex;align-items:center;gap:12px;margin:0;font-size:clamp(26px,3.4vw,36px);letter-spacing:-.5px}
.page-title .badge{font-size:11px;padding:3px 9px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-weight:650;letter-spacing:.3px}
.page-sub{margin:8px 0 0;color:var(--ink-2);font-size:14px}

/* ---------- search ---------- */
.searchbar{display:flex;gap:10px;margin-top:22px;max-width:640px}
.searchbar .field{position:relative;flex:1}
.searchbar input{
  width:100%;padding:13px 16px 13px 44px;border-radius:13px;border:1px solid var(--line);
  background:#fff;font-size:14px;outline:none;transition:border-color .18s,box-shadow .18s
}
.searchbar input:focus{border-color:rgba(200,16,46,.45);box-shadow:0 0 0 4px rgba(200,16,46,.08)}
.searchbar .field::before{content:"⌕";position:absolute;left:16px;top:50%;transform:translateY(-50%);font-size:18px;color:var(--ink-3);pointer-events:none}
.searchbar .btn{padding:0 22px}

/* ---------- toolbar / chips ---------- */
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:26px 0 18px}
.chips{display:flex;gap:7px;flex-wrap:wrap}
.chip{
  display:inline-flex;align-items:center;gap:7px;padding:7px 13px;border-radius:999px;
  background:#fff;border:1px solid var(--line);font-size:12.5px;color:var(--ink-2);transition:all .18s
}
.chip:hover{border-color:#d9d2c6;color:var(--ink)}
.chip.active{background:var(--ink);border-color:var(--ink);color:#fff}
.chip .n{font-size:10.5px;padding:1px 6px;border-radius:999px;background:var(--bg);color:var(--ink-3)}
.chip.active .n{background:rgba(255,255,255,.16);color:#fff}
.select{
  padding:8px 12px;border-radius:10px;border:1px solid var(--line);background:#fff;font-size:12.5px;color:var(--ink-2);outline:none
}

/* ---------- resource cards ---------- */
.res-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.res-card{display:flex;gap:12px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;transition:all .18s}
.res-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm);border-color:#ddd6ca}
.res-icon{width:40px;height:40px;flex:0 0 40px;border-radius:11px;background:var(--bg);display:grid;place-items:center;font-size:18px}
.res-name{font-size:13.5px;font-weight:650}
.res-desc{font-size:12px;color:var(--ink-2);margin-top:2px;line-height:1.5}
.res-url{font-size:11px;color:var(--ink-3);margin-top:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* ---------- empty / loading ---------- */
.empty{padding:56px 20px;text-align:center;color:var(--ink-3);background:#fff;border:1px dashed var(--line);border-radius:16px}
.empty .emoji{font-size:30px;display:block;margin-bottom:8px}
.skeleton{background:linear-gradient(90deg,#f1ede6 25%,#f8f5ef 50%,#f1ede6 75%);background-size:200% 100%;animation:shimmer 1.4s infinite;border-radius:10px}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ---------- modal ---------- */
.modal{position:fixed;inset:0;z-index:100;display:none;place-items:center;padding:20px;background:rgba(18,22,28,.52);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
.modal.open{display:grid}
.modal-card{width:min(420px,100%);background:#fff;border-radius:20px;padding:28px;box-shadow:0 30px 80px rgba(0,0,0,.25);position:relative;animation:pop .2s ease}
@keyframes pop{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}
.modal-close{position:absolute;right:14px;top:12px;border:0;background:none;font-size:20px;color:var(--ink-3);padding:6px;line-height:1}
.modal-icon{width:48px;height:48px;border-radius:14px;background:var(--brand-soft);display:grid;place-items:center;font-size:22px;margin:0 auto 12px}
.modal-card h2{margin:0;text-align:center;font-size:19px;letter-spacing:-.2px}
.modal-sub{margin:6px 0 22px;text-align:center;font-size:12.5px;color:var(--ink-3)}
.field-group{margin-bottom:14px}
.field-group label{display:block;font-size:12.5px;font-weight:600;color:var(--ink-2);margin-bottom:6px}
.input{width:100%;padding:11px 14px;border-radius:11px;border:1px solid var(--line);background:var(--surface-2);font-size:14px;outline:none;transition:border-color .18s,box-shadow .18s,background .18s}
.input:focus{border-color:rgba(200,16,46,.45);background:#fff;box-shadow:0 0 0 4px rgba(200,16,46,.08)}
.form-error{display:none;margin-top:10px;padding:9px 12px;border-radius:9px;background:#fff1f2;color:#be123c;font-size:12.5px}
.form-error.show{display:block}
.modal-foot{margin-top:16px;font-size:11px;color:var(--ink-3);text-align:center}
.pwd-hint{font-size:11px;color:var(--ink-3);margin-top:6px}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:28px;transform:translate(-50%,16px);z-index:120;
  background:#1c1f23;color:#fff;padding:11px 18px;border-radius:11px;font-size:13px;
  opacity:0;pointer-events:none;transition:all .22s;box-shadow:0 12px 30px rgba(0,0,0,.2);max-width:90vw
}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- misc ---------- */
.notice{display:flex;gap:10px;align-items:flex-start;padding:12px 16px;border-radius:12px;background:var(--accent-soft);border:1px solid #cfe9e4;color:#0f5f59;font-size:12.5px;line-height:1.6}
.notice b{font-weight:700}
.divider{height:1px;background:var(--line-2);margin:32px 0}

/* ---------- material cards ---------- */
.mat-list{display:flex;flex-direction:column;gap:12px}
.mat-card{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;transition:all .18s}
.mat-card:hover{border-color:#ddd6ca;box-shadow:var(--shadow-sm);transform:translateY(-1px)}
.mat-icon{width:52px;height:52px;flex:0 0 52px;border-radius:14px;background:linear-gradient(160deg,#fdf1f3,#f8e5e9);display:grid;place-items:center;font-size:24px;border:1px solid #f5dde2}
.mat-main{min-width:0;flex:1}
.mat-title{font-size:15.5px;font-weight:700;letter-spacing:.1px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.file-badge{font-size:9.5px;font-weight:700;letter-spacing:.5px;padding:2px 7px;border-radius:5px;background:var(--brand-soft);color:var(--brand);border:1px solid rgba(200,16,46,.12)}
.mat-desc{font-size:12.5px;color:var(--ink-2);line-height:1.7;margin-top:4px;max-width:860px}
.mat-meta{display:flex;gap:14px;flex-wrap:wrap;font-size:11.5px;color:var(--ink-3);margin-top:9px}
.mat-actions{flex:0 0 auto;display:flex;align-items:center;align-self:center;gap:8px}
@media(max-width:640px){
  .mat-card{flex-direction:column;gap:12px}
  .mat-actions{align-self:stretch}
  .mat-actions .btn{width:100%}
}

/* ---------- video player ---------- */
.video-card{width:min(980px,100%);padding:14px;background:#111;border-radius:18px;position:relative}
.video-card video{width:100%;max-height:72vh;border-radius:10px;background:#000;display:block}
.video-title{color:#fff;font-size:13px;margin:10px 4px 2px}
.video-fallback{display:none;color:#fca5a5;font-size:12px;margin:8px 4px 4px;line-height:1.6}
.video-card .modal-close{color:#9ca3af}

/* ---------- collection / course playlist ---------- */
.collection-card{width:min(1100px,100%);padding:18px;background:#fff;border-radius:18px;position:relative;max-height:92vh;display:flex;flex-direction:column}
.collection-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:2px 32px 12px 2px}
.collection-head h2{margin:0;font-size:19px;letter-spacing:-.2px}
.collection-body{display:grid;grid-template-columns:300px 1fr;gap:14px;min-height:0;flex:1}
.collection-list{max-height:64vh;overflow:auto;border:1px solid var(--line);border-radius:12px;background:#fff}
.col-item{display:flex;gap:8px;align-items:flex-start;width:100%;text-align:left;padding:10px 12px;border:0;border-bottom:1px solid var(--line-2);background:#fff;font-size:12.5px;color:var(--ink-2);cursor:pointer;line-height:1.5}
.col-item:last-child{border-bottom:0}
.col-item:hover{background:var(--bg)}
.col-item.active{background:var(--brand-soft);color:var(--brand);font-weight:600}
.col-item .n{flex:0 0 20px;color:var(--ink-3);font-size:11px;padding-top:1px}
.col-item.active .n{color:var(--brand)}
.collection-player{min-width:0;display:flex;flex-direction:column}
.collection-player video{width:100%;max-height:60vh;border-radius:12px;background:#000;display:block}
.collection-player .video-title{color:var(--ink-2);margin-top:10px}
.collection-doc{display:none;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:320px;border:1px dashed var(--line);border-radius:12px;background:var(--surface-2);padding:28px;text-align:center}
.collection-doc .doc-icon{font-size:48px;line-height:1}
.collection-doc .doc-title{font-size:17px;font-weight:700;color:var(--ink)}
.collection-doc .doc-meta{font-size:12px;color:var(--ink-3)}
.collection-doc .btn{margin-top:6px}
@media(max-width:780px){
  .collection-body{grid-template-columns:1fr}
  .collection-list{max-height:220px}
  .collection-player video{max-height:40vh}
}

/* ---------- responsive ---------- */
@media(max-width:1024px){
  .hero-grid{gap:32px}
  .service-grid{grid-template-columns:1fr 1fr}
  .service-card.feature{grid-column:1/-1;min-height:auto}
  .app-grid,.res-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.2fr 1fr 1fr 1fr}
}
@media(max-width:860px){
  .nav{
    display:none;position:absolute;top:66px;left:0;right:0;margin:0;
    flex-direction:column;background:#fff;border-bottom:1px solid var(--line);
    padding:10px 18px 16px;box-shadow:0 16px 30px rgba(0,0,0,.08);gap:2px
  }
  .nav.open{display:flex}
  .nav a{padding:12px 14px;border-radius:10px}
  .hamburger{display:block}
  .header-actions .btn span{display:none}
  .hero-grid{grid-template-columns:1fr;padding-top:40px;padding-bottom:44px}
  .hero-copy p.lead{max-width:100%}
  .hero-panel{max-width:560px}
  .stats-band{grid-template-columns:1fr 1fr;row-gap:22px}
  .stat + .stat{border-left:0;padding-left:0}
  .stat:nth-child(even){border-left:1px solid var(--line-2);padding-left:18px}
  .link-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .container,.header-inner{padding-left:16px;padding-right:16px}
  .hero h1{font-size:30px}
  .hero-tags{gap:12px;font-size:12px}
  .service-grid{grid-template-columns:1fr}
  .app-grid,.res-grid,.link-grid{grid-template-columns:1fr}
  .section{padding-top:44px}
  .section-head{align-items:flex-start;flex-direction:column;gap:8px}
  .stats-band{padding:20px;gap:18px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .searchbar{flex-direction:column}
  .searchbar .btn{padding:11px 20px}
  .page-hero{padding-top:30px}
  .toolbar{align-items:flex-start;flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}