/* ============================================================
 * layout.css —— 页面布局（页头/导航/Hero/区块排版）+ 响应式
 * 苹果风格：浅色毛玻璃导航 / 居中超大标题 Hero / 大留白区块
 * ============================================================ */

/* ---------- 顶部导航（黑色毛玻璃） ---------- */
.top{position:sticky;top:0;z-index:20;background:rgba(5,8,14,.86);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);border-bottom:1px solid rgba(255,255,255,.08)}
.top .wrap{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.logo{font-size:23px;font-weight:700;letter-spacing:.02em;color:var(--text);white-space:nowrap}
.logo small{display:block;font-size:10px;letter-spacing:.18em;color:var(--text2);margin-top:2px;font-weight:500}
.nav{display:flex;align-items:center;gap:26px}
.nav a{font-size:15px;color:#fff;font-weight:500}
.nav a:hover,.nav a:focus{color:var(--blue)}
.nav a.on{color:var(--blue);font-weight:600}
.menu-btn{display:none;border:1px solid var(--line);color:var(--text);background:transparent;border-radius:980px;padding:8px 14px}

/* ---------- 子页标题区 ---------- */
/* 子页横幅统一规格：与核心技术页 tech-hero 一致 —— 满屏、居中、同字号 */
.page-head{background:#05080f radial-gradient(ellipse at center,rgba(30,48,84,.35) 0%,rgba(5,8,15,.9) 78%);
  border-bottom:1px solid rgba(255,255,255,.06);color:var(--text);position:relative;
  min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:120px 24px}
.page-head .wrap{width:auto;max-width:900px;margin:0}
.page-head h1{font-size:clamp(40px,5vw,60px);margin:20px 0 18px;letter-spacing:-.02em;font-weight:700}
.page-head p{color:var(--text2);font-size:18px;margin:0 auto;max-width:640px;line-height:1.8}
/* 新闻页 · 影院式居中视频：演出期间不占布局（文字独占居中，同关于页），文字退场后原位放大浮现 */
.page-head .cinema{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:min(1160px,86vw,118vh);margin:0;
  transition:opacity 1.6s ease,transform 1.6s cubic-bezier(.22,.61,.36,1),filter 1.6s ease}
.page-head.armed .cinema{opacity:0;transform:translate(-50%,-50%) scale(.9);filter:blur(10px)}
.page-head .cinema.in{opacity:1;filter:none}
/* 文字退场后收起占位，让视频单独居中 */
.page-head.armed .eyebrow,.page-head.armed h1,.page-head.armed p{
  max-height:240px;overflow:hidden;
  transition:max-height 1.2s ease,margin 1.2s ease,opacity 1.2s ease}
.page-head.text-gone .eyebrow,.page-head.text-gone h1,.page-head.text-gone p{
  max-height:0;opacity:0;margin-top:0;margin-bottom:0}
.cinema-video{width:100%;aspect-ratio:960/544;display:block;background:#000;border-radius:14px;
  border:1px solid rgba(255,255,255,.16);box-shadow:0 26px 80px rgba(0,0,0,.65),0 0 52px rgba(70,120,210,.15)}
@media(max-width:760px){.page-head .cinema{width:min(92vw,118vh)}.cinema-video{border-radius:10px}}
@media (prefers-reduced-motion: reduce){.page-head .cinema{position:static;transform:none;width:min(700px,70vw);margin:46px auto 0}}

/* ---------- Hero（发布会式：黑色整屏居中超大标题） ---------- */
.hero{position:relative;overflow:hidden;min-height:100vh;background:#000;color:#fff;display:flex;align-items:center;text-align:center}
.hero .wrap{position:relative;z-index:1;width:min(920px,calc(100% - 48px));margin:auto}
.hero-copy{padding:120px 0;margin:0 auto}
.hero h1{font-size:clamp(48px,6vw,86px);line-height:1.08;letter-spacing:-.035em;margin:26px auto;max-width:15em;font-weight:700}
.hero h1 em{font-style:normal;color:#fff}
.hero p{font-size:20px;color:var(--text2);line-height:1.7;max-width:560px;margin:0 auto}
.actions{display:flex;gap:16px;margin-top:42px;flex-wrap:wrap;justify-content:center}

/* ---------- 通用区块 ---------- */
.section{padding:112px 0}
.soft{background:#0d0d0f}
.dark{background:#000;color:#fff}
.heading{text-align:center;margin-bottom:58px}
.heading h2{font-size:clamp(32px,4vw,52px);letter-spacing:-.03em;margin:12px 0 0;font-weight:700}
.heading p{line-height:1.7;color:var(--text2);max-width:540px;margin:16px auto 0}
.dark .heading p{color:#c9c9ce}
.dark .heading .eyebrow{color:#c9c9ce}

/* ============================================================
 * 响应式
 * ============================================================ */
@media(max-width:900px){
  .nav{gap:16px}.nav a{font-size:13px}
  .cards,.news-grid{grid-template-columns:repeat(2,1fr)}
  .p-list{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr 1fr}
  .case-text{padding:34px}
}
@media(max-width:680px){
  .wrap{width:min(100% - 32px,1150px)}
  .top .wrap{min-height:64px}
  .logo{font-size:19px}
  .menu-btn{display:inline-flex;align-items:center;gap:6px}
  .nav{display:none;position:absolute;left:0;right:0;top:64px;background:#111114;flex-direction:column;align-items:stretch;padding:18px 24px;gap:0;border-bottom:1px solid var(--line);box-shadow:0 20px 40px rgba(0,0,0,.5)}
  .nav.open{display:flex}
  .nav a{padding:13px 0;font-size:16px}
  .hero{min-height:100vh}.hero-copy{padding:96px 0}.hero p{font-size:17px}
  .section{padding:74px 0}
  .heading{margin-bottom:40px}
  .cards,.products,.news-grid,.statline,.p-list,.contact-grid{grid-template-columns:1fr}
  .case{grid-template-columns:1fr}.case-visual{min-height:210px}
  .cta{padding:84px 0}.cta .btn{margin-top:18px}
  .footer .wrap{display:block}.footer .foot-meta{margin-top:22px}
  .detail h2{font-size:30px}
  .page-head{min-height:88vh;padding:90px 20px}
}