/* AI Native 招聘解决方案 · 营销主站样式
 * 设计系统与对客 deck 同源：深藏青 0C2545 + 商务金 C2A14B + 钢蓝 2C6498 */
:root {
  --navy: #0C2545; --navy2: #1B3A63; --steel: #29466A; --blue: #2C6498;
  --gold: #C2A14B; --gold-soft: #EBDFBF; --gold-bg: #F7F2E4;
  --body: #455365; --muted: #6E7C8C; --faint: #9AA6B2;
  --line: #D9E2EE; --cbord: #DDE6F0; --soft: #EEF3F9; --soft2: #F5F8FC;
  --green: #2F7D6B; --red: #B03A2E;
  --dark-line: #2E4C77; --dark-sub: #C9D6E4; --dark-faint: #8FA6BE; --dark-card: #11294E;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", -apple-system, sans-serif;
  color: var(--body); background: #fff; line-height: 1.75; font-size: 16px;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 28px; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(12, 37, 69, .92); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--dark-line);
}
.nav-inner { max-width: 1180px; margin: 0 auto; padding: 0 28px; height: 64px; display: flex; align-items: center; gap: 28px; }
.nav-brand { color: #fff; font-weight: 700; font-size: 16px; letter-spacing: .5px; white-space: nowrap; }
.nav-brand em { font-style: normal; color: var(--gold); }
.nav-brand small { display: block; font-size: 10px; font-weight: 400; color: var(--dark-faint); letter-spacing: 2px; line-height: 1.2; }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { color: var(--dark-sub); font-size: 14px; transition: color .2s; }
.nav-links a:hover { color: var(--gold-soft); }
.nav-cta {
  background: var(--gold); color: var(--navy); font-weight: 700; font-size: 14px;
  padding: 9px 20px; border-radius: 999px; white-space: nowrap; transition: filter .2s;
}
.nav-cta:hover { filter: brightness(1.08); }

/* ---------- 深色 hero ---------- */
.hero {
  background: var(--navy); color: #fff; padding: 150px 0 0; position: relative; overflow: hidden;
}
.hero::before, .hero::after {
  content: ""; position: absolute; border-radius: 50%; border: 1px solid var(--dark-line);
}
.hero::before { width: 520px; height: 520px; right: -140px; top: -180px; }
.hero::after { width: 380px; height: 380px; right: 60px; bottom: -120px; background: var(--dark-card); border: none; }
.hero .wrap { position: relative; z-index: 2; }
.kicker { color: var(--dark-sub); font-size: 15px; letter-spacing: 1px; margin-bottom: 18px; }
.kicker::before { content: ""; display: block; width: 64px; height: 4px; background: var(--gold); margin-bottom: 14px; }
.hero h1 { font-size: 52px; line-height: 1.28; font-weight: 700; letter-spacing: 1px; }
.hero h1 em { font-style: normal; color: var(--gold); }
.hero .sub { margin-top: 20px; font-size: 17px; color: var(--dark-sub); max-width: 760px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.chip { border: 1px solid var(--dark-line); color: var(--dark-sub); font-size: 13px; padding: 7px 18px; border-radius: 999px; }
.hero-cta { display: flex; gap: 16px; margin-top: 36px; }
.btn-gold { background: var(--gold); color: var(--navy); font-weight: 700; padding: 13px 30px; border-radius: 8px; font-size: 15px; transition: filter .2s; }
.btn-gold:hover { filter: brightness(1.08); }
.btn-ghost { border: 1px solid var(--dark-line); color: var(--dark-sub); padding: 13px 30px; border-radius: 8px; font-size: 15px; transition: border-color .2s, color .2s; }
.btn-ghost:hover { border-color: var(--gold); color: var(--gold-soft); }
.hero-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--dark-line); border-top: 1px solid var(--dark-line); margin-top: 64px; }
.hero-stats > div { background: var(--navy); padding: 26px 30px 30px; }
.hero-stats b { display: block; font-size: 30px; color: var(--gold); font-weight: 700; line-height: 1.2; }
.hero-stats span { font-size: 13px; color: var(--dark-sub); }
.hero-note { background: var(--navy); text-align: right; padding: 10px 0 18px; font-size: 12px; color: var(--dark-faint); }

/* ---------- 通用 section ---------- */
section { padding: 88px 0; }
section.alt { background: var(--soft2); }
section.dark { background: var(--navy); color: #fff; }
.sec-tag { color: var(--gold); font-size: 13px; font-weight: 700; letter-spacing: 3px; margin-bottom: 10px; }
.sec-tag::before { content: ""; display: inline-block; width: 26px; height: 3px; background: var(--gold); vertical-align: middle; margin-right: 10px; }
h2 { font-size: 34px; color: var(--navy); font-weight: 700; line-height: 1.4; }
section.dark h2 { color: #fff; }
.sec-sub { margin-top: 10px; color: var(--muted); font-size: 16px; max-width: 820px; }
section.dark .sec-sub { color: var(--dark-sub); }

/* 卡片 */
.grid { display: grid; gap: 22px; margin-top: 44px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: #fff; border: 1px solid var(--cbord); border-radius: 12px; padding: 28px;
  box-shadow: 0 2px 14px rgba(27, 58, 99, .07); position: relative; overflow: hidden;
}
.card::before { content: ""; position: absolute; top: 0; left: 22px; right: 22px; height: 4px; background: var(--navy); border-radius: 0 0 4px 4px; }
.card.gold::before { background: var(--gold); }
.card h3 { color: var(--navy); font-size: 18px; margin-bottom: 4px; }
.card .tag { color: var(--blue); font-size: 12.5px; font-weight: 700; margin-bottom: 10px; }
.card.gold .tag { color: var(--gold); }
.card p { font-size: 14px; color: var(--body); }
.card .num { position: absolute; top: 14px; right: 20px; font-size: 30px; font-weight: 700; color: var(--soft); }
.ic { width: 46px; height: 46px; border-radius: 50%; background: var(--soft); display: flex; align-items: center; justify-content: center; font-size: 21px; margin-bottom: 14px; }
.card.gold .ic { background: var(--gold-bg); }

/* 深色卡片 */
.dcard { background: var(--dark-card); border: 1px solid var(--dark-line); border-radius: 12px; padding: 26px; }
.dcard h3 { color: #fff; font-size: 17px; margin-bottom: 8px; }
.dcard b.gold { color: var(--gold); }
.dcard p { font-size: 13.5px; color: var(--dark-sub); }

/* band 结论条 */
.band {
  margin-top: 40px; background: var(--navy); color: #fff; border-radius: 10px;
  padding: 18px 28px; font-size: 15px;
}
.band b { color: var(--gold); margin-right: 14px; }

/* ---------- 流程 ---------- */
.flow { display: grid; grid-template-columns: repeat(7, 1fr); gap: 10px; margin-top: 44px; }
.flow .step { background: #fff; border: 1px solid var(--cbord); border-radius: 10px; padding: 18px 12px; text-align: center; position: relative; }
.flow .step:not(:last-child)::after {
  content: "→"; position: absolute; right: -13px; top: 50%; transform: translateY(-50%);
  color: var(--gold); font-weight: 700; z-index: 2; font-size: 15px;
}
.flow .step .fi { font-size: 22px; }
.flow .step b { display: block; color: var(--navy); font-size: 14.5px; margin: 8px 0 4px; }
.flow .step span { font-size: 11.5px; color: var(--muted); line-height: 1.6; display: block; }
.flow .step.gold { border-color: var(--gold); background: var(--gold-bg); }

/* 对比表 */
.vs { margin-top: 44px; border: 1px solid var(--cbord); border-radius: 12px; overflow: hidden; }
.vs-row { display: grid; grid-template-columns: 1.1fr 2.6fr 2.6fr; }
.vs-row > div { padding: 18px 22px; font-size: 14px; border-top: 1px solid var(--cbord); }
.vs-row.head > div { border-top: none; font-weight: 700; font-size: 15px; }
.vs-row .h { background: var(--soft2); color: var(--navy); font-weight: 700; }
.vs-row .old { color: var(--muted); }
.vs-row .new { background: var(--gold-bg); color: var(--navy); }
.vs-row.head .old { background: var(--steel); color: #fff; }
.vs-row.head .new { background: var(--gold); color: var(--navy); }

/* 架构图 */
.arch { margin-top: 44px; display: grid; gap: 10px; }
.arch .layer { display: grid; grid-template-columns: 150px 1fr; border-radius: 10px; overflow: hidden; border: 1px solid var(--cbord); }
.arch .layer .name { background: var(--navy); color: #fff; display: flex; flex-direction: column; justify-content: center; padding: 16px 20px; font-weight: 700; font-size: 16px; }
.arch .layer .name small { font-size: 11px; color: var(--dark-faint); font-weight: 400; letter-spacing: 1px; }
.arch .layer .items { background: #fff; padding: 14px 20px; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.arch .layer .items i { font-style: normal; background: var(--soft); color: var(--steel); border-radius: 6px; padding: 6px 14px; font-size: 13px; }
.arch .layer.gold .name { background: var(--gold); color: var(--navy); }
.arch .layer.gold .name small { color: rgba(12,37,69,.55); }
.arch .layer.gold { border-color: var(--gold); }
.arch .layer.gold .items { background: var(--gold-bg); }
.arch .layer.gold .items i { background: #fff; color: var(--navy); border: 1px solid var(--gold-soft); }
.arch-id { text-align: center; background: var(--navy); color: #fff; border-radius: 10px; padding: 13px; font-size: 14px; }
.arch-id b { color: var(--gold); }

/* 时间轴 */
.tl { margin-top: 44px; position: relative; padding-left: 30px; }
.tl::before { content: ""; position: absolute; left: 8px; top: 8px; bottom: 8px; width: 2px; background: var(--line); }
.tl .item { position: relative; padding: 0 0 30px 24px; }
.tl .item::before { content: ""; position: absolute; left: -30px; top: 7px; width: 14px; height: 14px; border-radius: 50%; background: var(--navy); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--line); }
.tl .item.gold::before { background: var(--gold); }
.tl .item .when { font-size: 13px; font-weight: 700; color: var(--gold); letter-spacing: 1px; }
.tl .item h3 { color: var(--navy); font-size: 18px; margin: 2px 0 6px; }
.tl .item p { font-size: 14px; max-width: 860px; }

/* 红线列表 */
.redlines { margin-top: 44px; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.redline { display: flex; gap: 16px; background: #fff; border: 1px solid var(--cbord); border-left: 4px solid var(--navy); border-radius: 10px; padding: 18px 20px; }
.redline .no { flex: none; width: 30px; height: 30px; border-radius: 50%; background: var(--navy); color: var(--gold-soft); font-weight: 700; font-size: 13px; display: flex; align-items: center; justify-content: center; }
.redline b { color: var(--navy); display: block; font-size: 15px; }
.redline span { font-size: 13px; color: var(--body); }

/* 场景卡（链接到演示页） */
.scene { display: block; transition: transform .2s, box-shadow .2s; }
.scene:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(27, 58, 99, .14); }
.scene .go { margin-top: 14px; color: var(--gold); font-weight: 700; font-size: 13.5px; }
.scene .go::after { content: " →"; }

/* 页脚 */
footer { background: var(--navy); color: var(--dark-sub); padding: 60px 0 40px; }
footer .cols { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
footer h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
footer a { display: block; font-size: 13.5px; margin-bottom: 8px; color: var(--dark-sub); }
footer a:hover { color: var(--gold-soft); }
footer .brand { font-size: 18px; font-weight: 700; color: #fff; }
footer .brand em { font-style: normal; color: var(--gold); }
footer .fine { border-top: 1px solid var(--dark-line); margin-top: 40px; padding-top: 22px; font-size: 12px; color: var(--dark-faint); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* 进场动画 */
.rv { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.rv.on { opacity: 1; transform: none; }

@media (max-width: 960px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 34px; }
  .g3, .g4, .redlines, footer .cols { grid-template-columns: 1fr; }
  .g2 { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .flow .step:not(:last-child)::after { display: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .vs-row { grid-template-columns: 1fr; }
}

/* 商汤 logo */
.nav-brand { display: flex; align-items: center; gap: 14px; }
.nav-brand .nav-logo { height: 26px; display: block; }
.nav-brand .sep { width: 1px; height: 26px; background: var(--dark-line); flex: none; }
.nav-brand .nb-text { line-height: 1.3; }