/* ============================================================
   部首文化科技 · 官网设计系统
   风格基准: blackcubelabs.com(纯黑底 · 居中排版 · 电影级主视觉
   · 品牌色点缀 · 衬线大写小标签 · 深色圆角卡)
   品牌色: 黄 #FDD100 / 橙 #EF8641(取自"部首"LOGO)
   ============================================================ */

:root {
  --bg:        #000000;
  --bg-soft:   #0A0A0A;
  --card:      rgba(255, 255, 255, 0.02);
  --card-hi:   rgba(255, 255, 255, 0.045);
  --border:    rgba(255, 255, 255, 0.09);
  --brand:     #FDD100;   /* 部首黄(主点缀) */
  --brand-2:   #EF8641;   /* 部首橙(次点缀) */
  --text:      #FFFFFF;
  --body:      rgba(255, 255, 255, 0.74);
  --dim:       rgba(255, 255, 255, 0.52);
  /* 本机装了 Quicksand 仍会命中,但不再联网请求,国内首屏不被阻塞 */
  --font-sans: "Quicksand", -apple-system, BlinkMacSystemFont, "Segoe UI",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: Georgia, "Songti SC", "SimSun", serif;
  --max-w:     1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

::selection { background: rgba(253, 209, 0, 0.85); color: #000; }

:focus-visible { outline: 2px solid var(--brand); outline-offset: 3px; border-radius: 4px; }

/* ---------- 顶部公告条(白底黑字,位于固定导航内部) ---------- */
.topbar {
  position: relative;
  background: #FFFFFF;
  color: #111111;
  text-align: center;
  font-size: 13.5px;
  padding: 9px 44px;
}
.nav.scrolled .topbar { display: none; }
.topbar a { text-decoration: underline; text-underline-offset: 3px; }
.topbar-close {
  position: absolute; right: 14px; top: 50%;
  transform: translateY(-50%);
  background: none; border: 0; color: #555;
  font-size: 18px; cursor: pointer; line-height: 1; padding: 4px;
}
.topbar-close:hover { color: #000; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(0, 0, 0, 0.86);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--border);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center;
  padding: 14px 24px; gap: 16px;
}
.nav-burger {
  justify-self: start;
  background: none; border: 0; cursor: pointer;
  display: flex; flex-direction: column; gap: 5px; padding: 6px;
}
.nav-burger span { width: 20px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .25s; }
.nav-burger:hover span:nth-child(2) { transform: scaleX(.7); }
.nav-brand img { height: 44px; width: auto; }
.nav-right { justify-self: end; display: flex; align-items: center; gap: 22px; }
.nav-links { display: flex; gap: 26px; font-size: 14.5px; }
.nav-links a { color: var(--body); transition: color .2s; }
.nav-links a:hover { color: var(--brand); }
.nav-drawer { display: none; }

/* 黄色胶囊按钮(BCL "Become a Member" 式) */
.btn-pill {
  display: inline-block;
  background: var(--brand); color: #111;
  font-weight: 600; font-size: 14.5px;
  padding: 11px 26px; border-radius: 999px;
  transition: transform .2s, box-shadow .2s, background .2s;
  white-space: nowrap;
}
.btn-pill:hover {
  background: #FFE04D;
  transform: translateY(-1px);
  box-shadow: 0 6px 26px rgba(253, 209, 0, 0.35);
}
.btn-pill-lg { padding: 15px 34px; font-size: 16px; }
.btn-ghost-dark {
  display: inline-block;
  color: var(--text); font-weight: 500; font-size: 15px;
  padding: 14px 30px; border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  transition: border-color .2s, color .2s;
}
.btn-ghost-dark:hover { border-color: var(--brand); color: var(--brand); }

/* ---------- HERO(全屏电影级 · 居中) ---------- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 140px 24px 90px;
}
.hero-bg {
  position: absolute; inset: 0;
  background: url("../assets/hero_cinematic.jpg") center / cover no-repeat;
  opacity: .8;
}
.hero-video {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
/* 暗色蒙版:压低视频亮度、保证文字对比度(视频明暗未知时必备) */
.hero-veil {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 50% 40%, rgba(0,0,0,.35), rgba(0,0,0,.62) 70%, rgba(0,0,0,.78) 100%),
    linear-gradient(180deg, rgba(0,0,0,.55), rgba(0,0,0,.25) 35%, rgba(0,0,0,.7));
}
/* 中央黄色光晕 + 72px 淡网格(BCL 签名背景) */
.hero-glow {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 50% 38%, rgba(253, 209, 0, 0.10), rgba(239, 134, 65, 0.04) 42%, transparent 70%),
    linear-gradient(rgba(253, 209, 0, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(253, 209, 0, 0.028) 1px, transparent 1px);
  background-size: auto, 72px 72px, 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.9), rgba(0,0,0,.4) 60%, transparent);
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.9), rgba(0,0,0,.4) 60%, transparent);
}
.hero-content { position: relative; max-width: 880px; }
.hero-logo { width: 120px; margin: 0 auto 30px; filter: drop-shadow(0 0 34px rgba(253, 209, 0, 0.35)); }
.hero h1 {
  font-size: clamp(38px, 5.6vw, 62px);
  font-weight: 600;
  letter-spacing: .5px;
  line-height: 1.15;
  margin-bottom: 24px;
}
.hero-sub {
  color: var(--body);
  font-size: clamp(15px, 1.6vw, 17.5px);
  line-height: 1.9;
  margin-bottom: 40px;
}
.hero-sub strong { color: var(--text); font-weight: 600; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-scrollhint {
  position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%);
  color: var(--dim); font-size: 18px;
  animation: bob 2.2s ease-in-out infinite;
}
@keyframes bob { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

/* ---------- 滚动带(衬线大写小标签 + 黄色数字) ---------- */
.ticker { padding: 54px 24px 64px; text-align: center; }
.ticker-row {
  display: flex; justify-content: center; align-items: baseline;
  gap: 14px; flex-wrap: wrap;
}
.tick-num { font-weight: 700; color: var(--brand); font-size: 19px; }
.tick-label {
  font-family: var(--font-serif);
  font-size: 11px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--dim);
}
.ticker-row i { color: rgba(255,255,255,.2); font-style: normal; }
.ticker-divider {
  max-width: var(--max-w); margin: 26px auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border) 18%, var(--border) 82%, transparent);
}
.ticker-platforms .platform-chip {
  font-size: 13px; color: var(--body);
  border: 1px solid var(--border);
  border-radius: 999px; padding: 5px 16px;
  transition: border-color .2s, color .2s;
}
.ticker-platforms .platform-chip:hover { border-color: var(--brand); color: var(--brand); }
.ticker-platforms i { align-self: center; }

/* ---------- 通用区块 ---------- */
.section { padding: 96px 24px; max-width: var(--max-w); margin: 0 auto; }
.section-head { text-align: center; max-width: 780px; margin: 0 auto 56px; }
.kicker {
  font-family: var(--font-serif);
  font-size: 11.5px; letter-spacing: .24em; text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 18px;
}
.kicker-center { text-align: center; margin-bottom: 40px; }
.section h2 {
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 600; line-height: 1.3; letter-spacing: .3px;
}
.section-lead { color: var(--body); margin-top: 22px; font-size: 15.5px; }
.section-lead strong { color: var(--text); }

.text-link { display: inline-block; margin-top: 14px; color: var(--brand); font-size: 14.5px; font-weight: 600; }
.text-link:hover { text-decoration: underline; text-underline-offset: 4px; }

/* 三服务(BCL "one operating layer" 三段式) */
.trio {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
  text-align: center;
}
.trio-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 38px 28px;
  transition: border-color .25s, background .25s, transform .25s;
}
.trio-item:hover { border-color: rgba(253, 209, 0, .4); background: var(--card-hi); transform: translateY(-4px); }
.trio-item h3 { font-size: 19px; font-weight: 600; margin-bottom: 14px; }
.trio-item p { color: var(--dim); font-size: 14.5px; }

/* ---------- Before / After 对比卡 ---------- */
.ba-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.ba-card {
  border-radius: 20px; padding: 36px 32px;
  background: var(--card);
  border: 1px solid var(--border);
}
.ba-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 24px; display: flex; gap: 12px; align-items: baseline; }
.ba-tag { font-family: var(--font-serif); font-size: 13px; letter-spacing: .08em; }
.ba-before { color: var(--dim); }
.ba-before .ba-tag { color: var(--dim); }
.ba-before li { padding: 9px 0; font-size: 14.5px; color: rgba(255,255,255,.42); }
.ba-after {
  background: linear-gradient(180deg, rgba(253, 209, 0, 0.05), rgba(255, 255, 255, 0.02));
  border-color: rgba(253, 209, 0, 0.28);
}
.ba-after .ba-tag { color: var(--brand); }
.ba-after li { padding: 9px 0; font-size: 14.5px; color: var(--text); }
.ba-card ul li { line-height: 1.65; }
.ba-quote {
  margin-top: 26px;
  border: 1px solid rgba(253, 209, 0, 0.22);
  border-radius: 14px;
  padding: 18px 20px;
  font-style: italic; font-size: 14px;
  color: var(--body);
  background: rgba(253, 209, 0, 0.04);
}
.ba-quote cite { display: block; margin-top: 10px; font-style: normal; font-size: 12.5px; color: var(--dim); }

/* ---------- 数字 4 联(BCL 深色圆角卡 + 大号黄色数字) ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 42px 20px 34px;
  text-align: center;
  transition: border-color .25s, background .25s;
}
.stat-card:hover { border-color: rgba(253, 209, 0, .35); background: var(--card-hi); }
.stat-num {
  font-size: clamp(40px, 4.4vw, 54px);
  font-weight: 700; color: var(--brand); line-height: 1;
  margin-bottom: 18px;
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-family: var(--font-serif);
  font-size: 11px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--dim); margin-bottom: 10px;
}
.stat-desc { color: var(--body); font-size: 13.5px; }

/* ---------- 品牌宣言 + "为什么叫部首" ---------- */
.manifesto {
  position: relative;
  max-width: 820px; margin: 0 auto;
  text-align: center;
  padding: 0 40px;
}
.manifesto p {
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 500; line-height: 1.75; font-style: italic;
}
.manifesto strong { color: var(--brand); font-style: normal; }
.quote-mark {
  position: absolute; left: 0; top: -30px;
  font-family: var(--font-serif);
  font-size: 84px; line-height: 1; color: var(--brand); opacity: .85;
}
.quote-end { left: auto; right: 0; top: auto; bottom: -58px; }

.founder-grid {
  display: grid; grid-template-columns: 340px 1fr; gap: 56px;
  align-items: center; margin-top: 96px;
}
.founder-ring {
  width: 280px; height: 280px; margin: 0 auto;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(circle, rgba(253, 209, 0, 0.14), transparent 65%);
  border: 3px solid var(--brand);
  box-shadow: 0 0 60px rgba(253, 209, 0, 0.30), inset 0 0 40px rgba(253, 209, 0, 0.12);
}
.founder-ring img { width: 150px; }
.founder-body h2 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 8px; }
.founder-role { color: var(--brand); font-size: 14px; margin-bottom: 20px; }
.founder-role strong { color: var(--text); }
.founder-body > p { color: var(--body); font-size: 15px; margin-bottom: 14px; }
.founder-points { display: grid; gap: 12px; margin-top: 26px; }
.fp-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 20px;
}
.fp-tag {
  font-family: var(--font-serif);
  font-size: 11px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--brand); margin-bottom: 6px;
}
.fp-card p:last-child { color: var(--body); font-size: 14px; }

/* ---------- 01-04 转化步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.step-no {
  display: block;
  font-size: 15px; font-weight: 700; color: var(--brand);
  margin-bottom: 14px;
}
.step-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 11px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--dim); margin-bottom: 8px;
}
.step h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.step p { color: var(--dim); font-size: 14px; }
.step { border-top: 1px solid var(--border); padding-top: 26px; }

/* ---------- 双 CTA 卡 ---------- */
.cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.cta-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 36px;
  display: flex; flex-direction: column; align-items: flex-start;
  transition: border-color .25s, background .25s;
}
.cta-card:hover { border-color: rgba(253, 209, 0, .35); background: var(--card-hi); }
.cta-kicker {
  font-family: var(--font-serif);
  font-size: 11px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--brand); margin-bottom: 14px;
}
.cta-card h3 { font-size: 22px; font-weight: 600; margin-bottom: 12px; }
.cta-lead { color: var(--body); font-size: 14.5px; margin-bottom: 22px; }
.cta-card ul { margin-bottom: 28px; }
.cta-card li { color: var(--body); font-size: 14.5px; padding: 6px 0; }
.cta-note { margin-top: 14px; color: var(--dim); font-size: 12.5px; }

/* ---------- 页脚(多列) ---------- */
.footer { border-top: 1px solid var(--border); padding: 90px 24px 40px; }
.footer-cta { text-align: center; max-width: 640px; margin: 0 auto 80px; }
.footer-cta h2 { font-size: clamp(26px, 3.2vw, 38px); font-weight: 600; margin-bottom: 14px; }
.footer-cta p { color: var(--body); margin-bottom: 30px; }
.footer-grid {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--border);
}
.footer-brand img { height: 52px; margin-bottom: 18px; }
.footer-brand p { font-size: 15px; font-weight: 600; }
.footer-fine { color: var(--dim); font-size: 12.5px !important; font-weight: 400 !important; margin-top: 6px; }
.footer-col h4 {
  font-family: var(--font-serif);
  font-size: 11px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--dim); margin-bottom: 18px; font-weight: 400;
}
.footer-col a { display: block; color: var(--body); font-size: 14px; padding: 6px 0; transition: color .2s; }
.footer-col a:hover { color: var(--brand); }
.footer-bottom {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding-top: 30px;
  color: var(--dim); font-size: 13px;
}

/* ---------- 滚动入场 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-scrollhint { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .nav-links { display: none; }
  .nav-inner { grid-template-columns: auto 1fr auto; }
  .nav-brand { justify-self: center; }
  .nav-drawer {
    display: flex; flex-direction: column;
    background: rgba(0, 0, 0, 0.96);
    border-bottom: 1px solid var(--border);
    max-height: 0; overflow: hidden;
    transition: max-height .35s ease;
  }
  .nav-drawer.open { max-height: 320px; }
  .nav-drawer a { padding: 14px 28px; color: var(--body); border-top: 1px solid rgba(255,255,255,.05); }
  .nav-drawer a:hover { color: var(--brand); }

  .trio, .stat-grid, .steps { grid-template-columns: 1fr 1fr; }
  .ba-grid, .cta-grid { grid-template-columns: 1fr; }
  .founder-grid { grid-template-columns: 1fr; gap: 44px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .trio, .stat-grid, .steps { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { min-height: 88vh; }
  .topbar { font-size: 12px; padding: 8px 40px; }
  .quote-mark { font-size: 56px; top: -20px; }
  .quote-end { bottom: -40px; }
}

/* ============================================================
   子页面组件(关于 / 服务 / 案例 / 联系)
   ============================================================ */

/* ---------- 404 ---------- */
.page-404 { padding: 230px 24px 170px; text-align: center; }
.page-404 h1 { font-size: clamp(34px, 5vw, 56px); font-weight: 600; margin: 16px 0 18px; }
.page-404 > p { color: var(--body); max-width: 520px; margin: 0 auto 36px; }

/* 导航当前页高亮 */
.nav-links a.active { color: var(--brand); }
.nav-drawer a.active { color: var(--brand); }

/* 子页 Hero（深底光晕带 + 居中标题，区别于首页视频 Hero） */
.page-hero {
  position: relative;
  padding: 184px 24px 84px;
  text-align: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(253, 209, 0, .10), rgba(239, 134, 65, .03) 42%, transparent 70%),
    linear-gradient(180deg, #050505, #000 60%);
}
.page-hero h1 {
  font-size: clamp(32px, 4.6vw, 52px);
  font-weight: 600; line-height: 1.2; letter-spacing: .4px;
  margin: 18px 0 18px;
}
.page-hero p { color: var(--body); max-width: 680px; margin: 0 auto; font-size: 16px; }

/* 双栏(图文左右) */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: center; }
.split h2 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 18px; }
.split p { color: var(--body); margin-bottom: 14px; font-size: 15px; }
.split-visual {
  border: 1px solid var(--border); border-radius: 20px; overflow: hidden;
  background: var(--card);
}
.split-visual img { width: 100%; height: 100%; object-fit: cover; }

/* 服务板块详情卡(带要点列表) */
.svc-block {
  border-top: 1px solid var(--border);
  padding: 38px 0 34px;
}
.svc-no {
  font-family: var(--font-serif); font-size: 12px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--brand);
}
.svc-block h3 { font-size: clamp(22px, 2.6vw, 28px); font-weight: 600; margin: 10px 0 14px; }
.svc-block p { color: var(--body); max-width: 760px; margin-bottom: 20px; font-size: 15px; }
.svc-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 28px; max-width: 860px; }
.svc-list li { color: var(--body); font-size: 14.5px; padding: 5px 0; border-bottom: 1px solid rgba(255,255,255,.05); }
.svc-list li::before { content: "→ "; color: var(--brand); }

/* 能力证明卡(无真实案例时的占位证明) */
.proof-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.proof-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 18px;
  padding: 30px 26px; transition: border-color .25s, background .25s, transform .25s;
}
.proof-card:hover { border-color: rgba(253,209,0,.35); background: var(--card-hi); transform: translateY(-4px); }
.proof-card .pc-tag { font-family: var(--font-serif); font-size: 11px; letter-spacing: .2em; text-transform: uppercase; color: var(--dim); margin-bottom: 12px; }
.proof-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; }
.proof-card p { color: var(--body); font-size: 14px; }

/* 案例视频卡片(统一组件: B站内嵌 / 抖音外链) */
.case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.video-thumb {
  position: relative; border-radius: 18px; overflow: hidden; cursor: pointer;
  border: 1px solid var(--border); aspect-ratio: 16 / 9; background: #0c0c0c;
}
.video-thumb img { width: 100%; height: 100%; object-fit: cover; opacity: .9; transition: transform .4s, opacity .3s; }
.video-thumb:hover img { transform: scale(1.04); opacity: 1; }
.video-thumb iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.video-thumb .play {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 66px; height: 66px; border-radius: 50%;
  background: rgba(253, 209, 0, .92); color: #111;
  display: flex; align-items: center; justify-content: center; font-size: 22px;
  box-shadow: 0 0 30px rgba(253, 209, 0, .45); transition: transform .2s;
}
.video-thumb:hover .play { transform: translate(-50%, -50%) scale(1.06); }
.video-tag {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  font-family: var(--font-serif); color: #111; background: var(--brand);
  padding: 4px 10px; border-radius: 999px;
}
.video-cap { padding: 14px 2px 0; }
.video-cap h3 { font-size: 17px; font-weight: 600; }
.video-cap p { color: var(--dim); font-size: 13.5px; margin-top: 4px; }

/* 单案例展示(案例较少时改为单卡居中,避免半栏空白) */
.case-grid.is-single { grid-template-columns: 1fr; max-width: 880px; margin: 0 auto; }
.case-grid.is-single .video-cap { text-align: center; padding-top: 18px; }
.case-grid.is-single .video-cap p { max-width: 620px; margin: 8px auto 0; }
.case-grid.is-single .video-cap h3 { font-size: 20px; }
.video-cap .cap-idx {
  display: inline-block;
  font-family: var(--font-serif); font-size: 11px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--brand); margin-bottom: 10px;
}

/* 联系我们:邮箱展示块(联系表单已按需求移除) */
.contact-email { text-align: center; max-width: 640px; margin: 0 auto; }
.contact-email h2 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 600; line-height: 1.25; margin: 14px 0 18px; }
.contact-email-lead { color: var(--body); font-size: 15px; margin-bottom: 30px; }
.email-link {
  display: inline-block;
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 600;
  color: var(--brand);
  padding-bottom: 4px;
  border-bottom: 2px solid rgba(253, 209, 0, .4);
  transition: color .2s, border-color .2s, transform .2s;
  word-break: break-all;
}
.email-link:hover { color: #FFE04D; border-bottom-color: var(--brand); transform: translateY(-1px); }
.email-hint { color: var(--dim); font-size: 13px; margin-top: 16px; }

@media (max-width: 768px) {
  /* 移动端跳过 1.6MB 首屏视频,直接用 hero_cinematic 静态封面,省流量、快首屏 */
  .hero-video { display: none; }
}

@media (max-width: 960px) {
  .split, .case-grid { grid-template-columns: 1fr; }
  .svc-list { grid-template-columns: 1fr; }
  .proof-grid { grid-template-columns: 1fr; }
}