/* 四虎视频：深暖影院感 + 高信息密度内容站 */
:root{
  --brand:#7A2E3A;--brand-deep:#5F202B;--copper:#B07A57;--ink:#292527;--muted:#71686B;
  --dark:#211B1D;--paper:#F7F3F1;--paper-2:#EEE7E3;--amber:#D99A3E;--white:#fff;
  --line:rgba(41,37,39,.13);--shadow:0 18px 50px rgba(58,31,36,.10);--radius:22px;--radius-sm:14px;
  --max:1240px;--narrow:880px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--paper)}
body{margin:0;color:var(--ink);background:var(--paper);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.75;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration-thickness:.08em;text-underline-offset:.18em}
a:hover{color:var(--brand)}
button,input{font:inherit}
button{cursor:pointer}
.container{width:min(calc(100% - 40px),var(--max));margin-inline:auto}
.narrow{width:min(calc(100% - 40px),760px)}
.narrow-wide{width:min(calc(100% - 40px),980px)}
.skip-link{position:fixed;left:20px;top:10px;z-index:200;transform:translateY(-180%);padding:10px 14px;background:var(--white);border-radius:8px;color:var(--brand)}
.skip-link:focus{transform:none}
.site-header{position:sticky;top:0;z-index:100;background:rgba(247,243,241,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.header-inner{min-height:76px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;min-width:220px}
.brand img{width:44px;height:44px;object-fit:contain;border-radius:10px}
.brand span{display:flex;flex-direction:column;line-height:1.25}
.brand strong{font-size:18px;letter-spacing:.03em}
.brand small{margin-top:4px;font-size:11px;color:var(--muted)}
.primary-nav{display:flex;align-items:center;gap:6px;margin-left:auto}
.primary-nav a{padding:10px 12px;border-radius:999px;text-decoration:none;font-size:14px;color:#4b4346;white-space:nowrap}
.primary-nav a:hover,.primary-nav a[aria-current=page]{background:var(--paper-2);color:var(--brand)}
.search-open,.nav-toggle{border:1px solid var(--line);background:var(--white);padding:9px 13px;border-radius:999px;color:var(--ink)}
.nav-toggle{display:none}
.site-main{min-height:65vh;overflow:hidden}
.home-hero{background:var(--dark);color:#f8efec;padding:58px 0 64px;position:relative}
.home-hero:after{content:"";position:absolute;inset:auto 0 0;height:1px;background:linear-gradient(90deg,transparent,var(--copper),transparent);opacity:.6}
.hero-stage{display:grid;grid-template-columns:minmax(0,.9fr) minmax(420px,1.1fr);gap:54px;align-items:center}
.hero-copy{padding:30px 0}
.eyebrow{text-transform:none;letter-spacing:.11em;font-size:12px;font-weight:800;color:var(--brand);margin:0 0 10px}
.home-hero .eyebrow,.dark-section .eyebrow{color:#efbd75}
h1,h2,h3{line-height:1.25;letter-spacing:-.02em;margin:0 0 .55em}
h1{font-size:clamp(38px,5vw,68px)}
h2{font-size:clamp(28px,3.2vw,44px)}
h3{font-size:20px}
.hero-lead,.lead{font-size:clamp(17px,1.5vw,21px);line-height:1.85;color:inherit;max-width:780px}
.hero-lead{color:#d9cfd1}
.hero-actions,.action-row{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:28px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border:0;border-radius:999px;background:var(--amber);color:#271c12!important;text-decoration:none;font-weight:800;box-shadow:0 6px 20px rgba(217,154,62,.18)}
.button:hover{transform:translateY(-1px)}
.button.secondary{background:var(--brand);color:#fff!important}
.text-link{font-weight:800;color:var(--brand);text-decoration:none;border-bottom:1px solid currentColor}
.text-link.light{color:#f2dfd7}
.hero-media{margin:0;position:relative}
.hero-media img{width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:28px 28px 8px 28px;box-shadow:0 34px 90px rgba(0,0,0,.35)}
.hero-media figcaption{position:absolute;right:18px;bottom:18px;max-width:310px;padding:10px 14px;border-radius:10px;background:rgba(33,27,29,.82);font-size:13px;color:#efe4e0}
.section{padding:82px 0}
.section-heading{max-width:880px;margin-bottom:34px}
.section-heading>p:last-child,.split-heading>p{color:var(--muted)}
.split-heading{max-width:none;display:grid;grid-template-columns:1fr .8fr;gap:70px;align-items:end}
.article-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.article-card{padding:22px;border-top:3px solid var(--brand);background:#fff;min-height:260px;display:flex;flex-direction:column;box-shadow:0 10px 32px rgba(74,38,44,.06)}
.article-card:nth-child(3n){border-top-color:var(--copper)}
.article-card:nth-child(4n){border-top-color:var(--amber)}
.article-card h3{font-size:18px;margin-top:10px}
.article-card h3 a{text-decoration:none}
.article-card p{color:var(--muted);font-size:14px;margin:0 0 18px}
.article-meta{display:flex;justify-content:space-between;gap:10px;font-size:11px;color:var(--muted)}
.tag-row{display:flex;gap:6px;flex-wrap:wrap;margin-top:auto}
.tag-row span{padding:4px 8px;border-radius:999px;background:var(--paper-2);font-size:11px;color:#6c5d61}
.section-link{margin-top:26px;text-align:right}
.cinema-band{padding:90px 0;background:var(--paper-2)}
.cinema-layout{display:grid;grid-template-columns:1.12fr .88fr;gap:56px;align-items:center}
.cinema-feature{margin:0}
.cinema-feature img{width:100%;aspect-ratio:5/4;object-fit:cover;border-radius:8px 42px 8px 42px;box-shadow:var(--shadow)}
.cinema-copy p{color:var(--muted)}
.lined-list{list-style:none;padding:0;margin:28px 0;display:grid;gap:0;border-top:1px solid var(--line)}
.lined-list li{padding:16px 0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:150px 1fr;gap:22px}
.lined-list span{color:var(--muted)}
.dense-index{border-top:1px solid var(--line)}
.dense-index article{display:grid;grid-template-columns:74px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--line)}
.index-no{font:700 30px/1 Georgia,serif;color:var(--copper)}
.dense-index h3{margin-bottom:6px}
.dense-index h3 a{text-decoration:none}
.dense-index p{margin:0;color:var(--muted)}
.alt-section{background:var(--paper-2)}
.access-strip{display:grid;grid-template-columns:1fr .68fr;gap:60px;align-items:center}
.access-strip figure{margin:0}.access-strip img{border-radius:28px;box-shadow:var(--shadow)}
.note-columns{display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}
.note-columns article{padding:28px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.note-columns p{color:var(--muted);margin:0}
.dark-section{background:var(--dark);color:#f5ece9}
.compact-topics{display:grid;grid-template-columns:.7fr 1.3fr;gap:60px;align-items:start}
.compact-topics>div>p:last-child{color:#c9bec0}
.topic-links{display:grid;gap:18px}
.topic-links a{display:grid;grid-template-columns:160px 1fr;align-items:center;gap:18px;background:#2b2426;border:1px solid rgba(255,255,255,.08);padding:12px;text-decoration:none;border-radius:16px}
.topic-links img{width:160px;height:105px;object-fit:cover;border-radius:10px}
.topic-links span{display:flex;flex-direction:column}.topic-links small{margin-top:4px;color:#cfc1c4;line-height:1.55}
.map-list{display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid var(--line)}
.map-list a{padding:22px 0;border-bottom:1px solid var(--line);text-decoration:none;display:flex;flex-direction:column;gap:4px}
.map-list a:nth-child(odd){padding-right:30px}.map-list a:nth-child(even){padding-left:30px;border-left:1px solid var(--line)}
.map-list span{color:var(--muted);font-size:14px}
.map-list.compact{grid-template-columns:repeat(4,1fr)}
.map-list.compact a{padding:18px;border-left:1px solid var(--line)}
.breadcrumb{padding-top:22px;color:var(--muted);font-size:13px}
.breadcrumb ol{display:flex;gap:8px;list-style:none;padding:0;margin:0;flex-wrap:wrap}.breadcrumb li+li:before{content:"/";margin-right:8px;color:#ad9fa3}.breadcrumb a{text-decoration:none}
.section-intro{display:grid;grid-template-columns:1fr .8fr;gap:60px;align-items:center;padding-top:56px}
.intro-image{margin:0}.intro-image img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:36px 8px 36px 8px}
.prose-columns{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;padding-top:0}
.prose-columns article{padding:26px;background:#fff;border-left:3px solid var(--copper)}
.note-list{margin:0;padding-left:1.15em}.note-list li{margin:.65em 0;color:#5f5659}
.contextual-links{padding-top:38px}.contextual-links h2{font-size:28px}
.library-head{padding-bottom:28px}.filter-nav{display:flex;gap:8px;flex-wrap:wrap;margin-top:28px}.filter-nav a{padding:8px 12px;border:1px solid var(--line);border-radius:999px;text-decoration:none;font-size:13px;background:#fff}.filter-nav a[aria-current=page]{background:var(--brand);color:#fff;border-color:var(--brand)}
.library-count{margin-bottom:18px;color:var(--muted);font-size:14px}
.topic-hero,.support-hero{display:grid;grid-template-columns:1fr .75fr;gap:60px;align-items:center;padding-top:52px}.topic-hero img,.support-hero img{border-radius:10px 34px 10px 34px;box-shadow:var(--shadow)}
.topic-directory{padding-top:12px}.topic-directory article{display:grid;grid-template-columns:360px 1fr;gap:34px;align-items:center;padding:28px 0;border-top:1px solid var(--line)}.topic-directory article:last-child{border-bottom:1px solid var(--line)}.topic-directory figure{margin:0}.topic-directory img{width:100%;aspect-ratio:3/2;object-fit:cover;border-radius:14px}
.reference-list{columns:2;column-gap:28px}.reference-list article{break-inside:avoid;margin:0 0 22px;padding:22px;background:#fff;border-radius:var(--radius-sm)}.reference-list h3{font-size:17px}.reference-list p{font-size:14px;color:var(--muted);margin:0}
.article-page{padding:55px 0 10px}.article-header{max-width:860px}.article-header h1{font-size:clamp(36px,5vw,60px)}.article-cover{margin:40px 0}.article-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:30px}.article-body{font-size:18px}.article-body p{margin:1.25em 0;color:#403a3c}.article-body h2{margin-top:1.6em;font-size:30px}.checklist{margin:42px 0;padding:28px;background:var(--paper-2);border-left:4px solid var(--brand)}.checklist h2{margin-top:0}.related-block{padding-top:46px}
.search-page{padding-top:50px}.page-search{margin:30px 0 38px;max-width:760px}.page-search label{display:block;font-weight:700;margin-bottom:8px}.page-search>div,.search-form-row{display:flex;gap:10px}.page-search input,.search-dialog input{min-width:0;flex:1;border:1px solid #bbaeb2;background:#fff;padding:11px 14px;border-radius:999px;outline:none}.page-search input:focus,.search-dialog input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(122,46,58,.12)}.empty-state{padding:28px;background:#fff;border-left:4px solid var(--copper)}
.support-columns{padding-top:20px}.faq-list{padding-top:10px;max-width:980px}.faq-item{border-top:1px solid var(--line)}.faq-item:last-child{border-bottom:1px solid var(--line)}.faq-item h2{margin:0}.faq-item button{display:flex;width:100%;justify-content:space-between;gap:20px;text-align:left;padding:22px 0;border:0;background:transparent;color:var(--ink);font-weight:800}.faq-item button span{font-size:24px;color:var(--brand)}.faq-answer{padding:0 42px 22px 0;color:var(--muted)}
.error-panel{padding:110px 0 160px}.error-panel h1{font-size:52px}.error-panel p{font-size:18px;color:var(--muted)}
.site-footer{background:#1c1719;color:#e9dddd;padding:62px 0 24px}.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:50px}.site-footer h2{font-size:16px;color:#fff}.site-footer p{font-size:14px;color:#c7b9bc;max-width:420px}.site-footer nav{display:flex;flex-direction:column;gap:9px}.site-footer a{font-size:13px;color:#d9cccf;text-decoration:none}.site-footer a:hover{color:#fff}.footer-bottom{margin-top:40px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;gap:20px;font-size:12px;color:#a99a9e}
.search-modal[hidden]{display:none!important}.search-modal{position:fixed;inset:0;z-index:180;display:grid;place-items:center;padding:20px}.search-backdrop{position:absolute;inset:0;background:rgba(20,15,17,.72)}.search-dialog{position:relative;z-index:1;width:min(100%,620px);background:var(--paper);padding:34px;border-radius:24px;box-shadow:0 30px 100px rgba(0,0,0,.4)}.search-dialog h2{font-size:30px}.search-dialog label{display:block;font-weight:700;margin-bottom:8px}.search-close{position:absolute;right:16px;top:14px;width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:#fff;font-size:23px;line-height:1}.search-help{font-size:13px;color:var(--muted)}
.back-top{position:fixed;right:18px;bottom:18px;width:46px;height:46px;border-radius:50%;border:0;background:var(--brand);color:#fff;box-shadow:var(--shadow);opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s}.back-top.show{opacity:1;pointer-events:auto;transform:none}
@media (max-width:1100px){
  .header-inner{gap:14px}.brand{min-width:auto}.brand small{display:none}.primary-nav{gap:2px}.primary-nav a{padding:9px 8px;font-size:13px}
  .hero-stage{grid-template-columns:1fr 1fr;gap:34px}.article-grid{grid-template-columns:repeat(3,1fr)}
  .map-list.compact{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1.4fr 1fr 1fr}.footer-grid nav:last-child{grid-column:2/4}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex;margin-left:auto}.primary-nav{position:absolute;left:20px;right:20px;top:68px;display:none;flex-direction:column;align-items:stretch;background:#fff;padding:12px;border-radius:16px;box-shadow:var(--shadow)}.primary-nav.open{display:flex}.search-open{margin-left:0}
  .hero-stage,.cinema-layout,.section-intro,.topic-hero,.support-hero,.access-strip,.compact-topics{grid-template-columns:1fr}.hero-stage{gap:26px}.home-hero{padding-top:32px}.hero-copy{padding-bottom:0}.hero-media{max-width:760px}
  .article-grid{grid-template-columns:repeat(2,1fr)}.split-heading{grid-template-columns:1fr;gap:10px}.prose-columns{grid-template-columns:1fr}.topic-directory article{grid-template-columns:260px 1fr}.reference-list{columns:1}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid nav:last-child{grid-column:auto}
}
@media (max-width:640px){
  .container,.narrow,.narrow-wide{width:min(calc(100% - 28px),var(--max))}.header-inner{min-height:66px}.brand strong{font-size:16px}.brand img{width:38px;height:38px}.search-open{font-size:12px;padding:8px 10px}.nav-toggle{font-size:12px;padding:8px 10px}
  h1{font-size:38px}.hero-lead,.lead{font-size:17px}.section{padding:58px 0}.home-hero{padding-bottom:44px}.hero-media figcaption{position:static;margin-top:8px;background:transparent;padding:0;color:#bfb2b5}
  .article-grid{grid-template-columns:1fr}.article-card{min-height:0}.cinema-band{padding:58px 0}.lined-list li{grid-template-columns:1fr;gap:4px}.dense-index article{grid-template-columns:44px 1fr}.index-no{font-size:21px}
  .note-columns{grid-template-columns:1fr}.map-list,.map-list.compact{grid-template-columns:1fr}.map-list a,.map-list a:nth-child(odd),.map-list a:nth-child(even),.map-list.compact a{padding:18px 0;border-left:0}.topic-links a{grid-template-columns:110px 1fr}.topic-links img{width:110px;height:82px}.topic-directory article{grid-template-columns:1fr;gap:16px}.topic-directory figure{max-width:420px}
  .footer-grid{grid-template-columns:1fr}.footer-bottom{flex-direction:column}.page-search>div,.search-form-row{flex-direction:column}.search-dialog{padding:26px 20px}.article-body{font-size:16px}.article-cover{margin:28px 0}.faq-answer{padding-right:0}
}
@media (max-width:390px){.search-open{display:none}.brand{gap:8px}.hero-actions{align-items:stretch;flex-direction:column}.button{width:100%}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.back-top,.button{transition:none}}