/* ==========================================================================
   万利官网 style.css
   影视 AI 大模型 / AI 电影生成 / 智能影视内容平台 —— 全站统一样式表
   ========================================================================== */

:root{
  /* 色彩体系：深炭黑 + 影视银灰 + 暖白 + 深蓝紫 + 青蓝 + 胶片暖橙 */
  --ink:#1A1A22;
  --ink-soft:#4B4956;
  --ink-faint:#7A7886;
  --paper:#FAF8F4;
  --paper-alt:#F1EEE7;
  --surface:#FFFFFF;
  --line:#E4DFD6;
  --line-soft:#ECE8E0;

  --navy-1:#241F3D;
  --navy-2:#141224;
  --violet:#5B4FCF;
  --violet-soft:#EFEDFB;
  --cyan:#1E93A0;
  --cyan-soft:#E7F4F5;
  --orange:#C97A3B;
  --orange-soft:#F7ECE1;

  --radius-s:6px;
  --radius-m:12px;
  --radius-l:20px;
  --shadow-card:0 1px 2px rgba(20,18,36,0.04), 0 8px 24px rgba(20,18,36,0.06);
  --shadow-hero:0 20px 60px rgba(20,18,36,0.35);
  --maxw:1160px;
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  background:var(--paper);
  color:var(--ink);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block;}
a{color:var(--violet);text-decoration:none;}
a:hover{text-decoration:underline;}
h1,h2,h3,h4{
  font-weight:700;
  line-height:1.35;
  margin:0 0 .6em;
  color:var(--ink);
  letter-spacing:.01em;
}
p{margin:0 0 1em;}
ul,ol{margin:0 0 1em;padding-left:1.4em;}
li{margin-bottom:.4em;}
figure{margin:0;}
table{border-collapse:collapse;width:100%;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(250,248,244,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-row{
  display:flex;align-items:center;justify-content:space-between;
  height:64px;
}
.brand{
  display:flex;align-items:center;gap:8px;
  font-size:20px;font-weight:800;color:var(--ink);
}
.brand:hover{text-decoration:none;}
.brand-mark{
  width:32px;height:32px;border-radius:8px;
  background:linear-gradient(135deg,var(--violet),var(--navy-1));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:15px;font-weight:800;
  flex-shrink:0;
}
.main-nav{display:flex;gap:2px;align-items:center;}
.main-nav a{
  display:inline-block;padding:9px 13px;border-radius:999px;
  color:var(--ink-soft);font-size:14.5px;font-weight:600;
  white-space:nowrap;
}
.main-nav a:hover,.main-nav a[aria-current="page"]{
  background:var(--violet-soft);color:var(--violet);text-decoration:none;
}
.nav-toggle{
  display:none;width:40px;height:40px;border-radius:8px;border:1px solid var(--line);
  background:var(--surface);align-items:center;justify-content:center;cursor:pointer;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:2px;background:var(--ink);position:relative;
  transition:.2s;
}
.nav-toggle span::before{position:absolute;top:-6px;}
.nav-toggle span::after{position:absolute;top:6px;}

/* ---------- Hero ---------- */
.hero{
  background:radial-gradient(1200px 400px at 15% -20%,rgba(91,79,207,.35),transparent 60%),
             linear-gradient(160deg,var(--navy-1),var(--navy-2));
  color:#F4F2FA;
  padding:56px 0 64px;
}
.hero .container{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;letter-spacing:.04em;
  color:#C9C2F5;background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.14);
  padding:6px 12px;border-radius:999px;margin-bottom:18px;
}
.hero h1{color:#fff;font-size:clamp(26px,4vw,38px);margin-bottom:.5em;}
.hero p.lede{color:#D8D4EC;font-size:16.5px;max-width:60ch;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px;}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;border-radius:999px;font-weight:700;font-size:14.5px;
  border:1px solid transparent;cursor:pointer;
}
.btn:hover{text-decoration:none;}
.btn-primary{background:var(--violet);color:#fff;}
.btn-primary:hover{background:#4a40b8;}
.btn-ghost{background:rgba(255,255,255,.06);color:#fff;border-color:rgba(255,255,255,.28);}
.btn-ghost:hover{background:rgba(255,255,255,.14);}
.btn-line{background:transparent;color:var(--violet);border-color:var(--violet);}
.btn-line:hover{background:var(--violet-soft);}
.hero-art{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius-l);padding:18px;box-shadow:var(--shadow-hero);
}
.hero-art img{border-radius:var(--radius-m);}

/* Page hero (secondary pages, no side art) */
.page-hero .container{grid-template-columns:1fr;}
.page-hero p.lede{max-width:74ch;}
.hero-stats{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;}
.hero-stat{
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);
  border-radius:var(--radius-m);padding:10px 14px;font-size:13.5px;color:#E4E1F2;
}
.hero-stat b{color:#fff;display:block;font-size:14.5px;margin-bottom:2px;}

/* ---------- Section 通用 ---------- */
.section{padding:56px 0;}
.section-alt{background:var(--paper-alt);}
.section-head{max-width:74ch;margin-bottom:28px;}
.section-tag{
  display:inline-block;font-size:12.5px;font-weight:800;letter-spacing:.06em;
  color:var(--violet);text-transform:uppercase;margin-bottom:10px;
}
.section-head h2{font-size:clamp(21px,2.6vw,28px);}
.section-head p{color:var(--ink-soft);font-size:15.5px;}

/* ---------- 工作链 / Pipeline ---------- */
.pipeline-figure{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-l);
  padding:22px;box-shadow:var(--shadow-card);
}
figcaption,.fig-caption{
  font-size:13.5px;color:var(--ink-faint);margin-top:10px;line-height:1.6;
}
.fig-caption b{color:var(--ink-soft);}

/* ---------- 目录 / TOC ---------- */
.toc-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px;
}
.toc-item{
  display:block;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-m);padding:14px 16px;color:var(--ink);font-weight:700;font-size:14.5px;
}
.toc-item small{display:block;font-weight:500;color:var(--ink-faint);font-size:12.5px;margin-top:3px;}
.toc-item:hover{border-color:var(--violet);text-decoration:none;background:var(--violet-soft);}

/* ---------- 文章卡片（摘要网格） ---------- */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-m);
  padding:20px;box-shadow:var(--shadow-card);display:flex;flex-direction:column;gap:10px;
}
.card-meta{display:flex;gap:8px;align-items:center;font-size:12.5px;color:var(--ink-faint);}
.pill{
  display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:700;
  background:var(--violet-soft);color:var(--violet);
}
.pill.cyan{background:var(--cyan-soft);color:var(--cyan);}
.pill.orange{background:var(--orange-soft);color:var(--orange);}
.card h3{font-size:16.5px;margin-bottom:2px;}
.card p{color:var(--ink-soft);font-size:14.5px;margin-bottom:0;flex:1;}
.card .card-link{font-size:13.5px;font-weight:700;}

/* ---------- 长文章 ---------- */
.article{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-l);
  padding:32px clamp(18px,4vw,44px);margin-bottom:22px;box-shadow:var(--shadow-card);
  scroll-margin-top:84px;
}
.article-head{margin-bottom:18px;border-bottom:1px solid var(--line-soft);padding-bottom:16px;}
.article-head h2,.article-head h3{margin-bottom:8px;font-size:clamp(19px,2.4vw,25px);}
.article .card-meta{margin-bottom:2px;}
.article h4{font-size:16.5px;color:var(--violet);margin-top:1.6em;}
.article p{color:var(--ink);font-size:15.5px;}
.callout{
  background:var(--orange-soft);border-left:3px solid var(--orange);
  border-radius:var(--radius-s);padding:14px 16px;margin:16px 0;font-size:14.5px;color:var(--ink-soft);
}
.callout b{color:var(--ink);}
.article-figure{margin:20px 0;}
.article-figure img{border:1px solid var(--line);border-radius:var(--radius-m);background:var(--surface);}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:16px 0;font-size:15.5px;font-weight:700;color:var(--ink);
  display:flex;justify-content:space-between;align-items:center;gap:14px;
  font-family:inherit;
}
.faq-q::after{content:"+";font-size:20px;color:var(--violet);flex-shrink:0;transition:transform .2s;}
.faq-item.open .faq-q::after{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;}
.faq-item.open .faq-a{max-height:400px;}
.faq-a p{padding:0 0 16px;color:var(--ink-soft);font-size:14.5px;}

/* ---------- 关于 / 公司信息 ---------- */
.about-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:28px;}
.info-box{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-m);
  padding:20px;font-size:14px;color:var(--ink-soft);
}
.info-box dt{font-weight:700;color:var(--ink);margin-top:12px;}
.info-box dt:first-child{margin-top:0;}
.info-box dd{margin:2px 0 0;}

/* ---------- 表格 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius-m);}
table.compare{min-width:520px;}
table.compare th,table.compare td{
  text-align:left;padding:10px 14px;border-bottom:1px solid var(--line-soft);font-size:14px;
}
table.compare th{background:var(--paper-alt);color:var(--ink);font-weight:700;}
table.compare td{color:var(--ink-soft);}

/* ---------- 功能列表（App） ---------- */
.feature-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:14px;}
.feature-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-m);
  padding:16px;display:flex;gap:12px;align-items:flex-start;
}
.feature-num{
  width:30px;height:30px;border-radius:8px;background:var(--violet-soft);color:var(--violet);
  font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.feature-item h4{font-size:15px;margin:0 0 4px;}
.feature-item p{font-size:13.5px;color:var(--ink-soft);margin:0;}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-2);color:#C7C3DA;padding:44px 0 24px;margin-top:20px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;padding-bottom:26px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-brand .brand{color:#fff;}
.footer-brand p{font-size:13.5px;color:#A6A1BE;margin-top:10px;max-width:34ch;}
.footer-col h5{color:#fff;font-size:13.5px;margin-bottom:12px;letter-spacing:.03em;}
.footer-col ul{list-style:none;padding:0;margin:0;}
.footer-col a{color:#B4AFCB;font-size:13.5px;}
.footer-col a:hover{color:#fff;}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:space-between;
  padding-top:18px;font-size:12.5px;color:#8B86A6;
}
.footer-bottom a{color:#8B86A6;}
.footer-bottom a:hover{color:#fff;}

/* ---------- 返回顶部 ---------- */
.back-top{
  position:fixed;right:18px;bottom:18px;width:42px;height:42px;border-radius:50%;
  background:var(--violet);color:#fff;border:none;box-shadow:var(--shadow-card);
  display:none;align-items:center;justify-content:center;cursor:pointer;z-index:90;font-size:18px;
}
.back-top.show{display:flex;}

/* ---------- 首页专题分组 ---------- */
.topic-group{margin-top:38px;}
.topic-group:first-child{margin-top:0;}
.topic-group h3{font-size:17px;margin-bottom:14px;color:var(--ink);}
.topic-group .card p{font-size:13.5px;}
.intro-text{max-width:78ch;color:var(--ink-soft);font-size:15px;margin-bottom:10px;}

/* ---------- 响应式 ---------- */
@media (max-width:880px){
  .hero .container{grid-template-columns:1fr;}
  .hero-art{order:-1;}
  .about-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:720px){
  .nav-toggle{display:flex;}
  .main-nav{
    position:absolute;top:64px;left:0;right:0;background:var(--surface);
    border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;
    padding:8px 20px 14px;display:none;gap:2px;
  }
  .main-nav.open{display:flex;}
  .main-nav a{padding:11px 8px;border-radius:8px;}
  .section{padding:40px 0;}
  .article{padding:22px 16px;}
  .footer-grid{grid-template-columns:1fr;gap:22px;}
}
@media (max-width:480px){
  .hero{padding:38px 0 46px;}
  .card-grid{grid-template-columns:1fr;}
  .toc-grid{grid-template-columns:1fr 1fr;}
}