/* ============================================================
   万有知兴 · 企业 AI 落地服务  —— 全局样式（深色科技风）
   品牌色：深蓝 #0d1b2a · 电光蓝 #1a73e8 · 青蓝 #00b4d8 · 金 #f59e0b
   ============================================================ */

:root {
  --bg: #0a1420;
  --bg-2: #0d1b2a;
  --bg-3: #12233a;
  --card: #101f31;
  --card-2: #14273c;
  --line: rgba(148, 183, 220, 0.14);
  --line-strong: rgba(148, 183, 220, 0.24);

  --blue: #1a73e8;
  --blue-2: #4c92f0;
  --cyan: #00b4d8;
  --cyan-2: #33d6f5;
  --gold: #f5b942;
  --green: #2ec27e;

  --text: #e9f0f8;
  --text-2: #b3c4d8;
  --text-3: #7f96ad;

  --grad: linear-gradient(135deg, #1a73e8 0%, #00b4d8 100%);
  --grad-soft: linear-gradient(135deg, rgba(26,115,232,.16), rgba(0,180,216,.16));

  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 12px 40px rgba(2, 8, 20, 0.55);
  --shadow-sm: 0 4px 18px rgba(2, 8, 20, 0.4);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

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

img { max-width: 100%; display: block; }
a { color: var(--cyan-2); text-decoration: none; }
a:hover { color: #fff; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container--narrow { max-width: 860px; }

::selection { background: rgba(0, 180, 216, .35); }

/* ---------- 通用工具 ---------- */
.section { padding: 84px 0; }
.section--tight { padding: 56px 0; }
.center { text-align: center; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .12em;
  color: var(--cyan-2); text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--cyan); }

.h2 {
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 700; line-height: 1.25; letter-spacing: -.01em;
  margin: 14px 0 12px; color: #fff;
}
.h2 .accent { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--text-2); font-size: 17px; max-width: 720px; }
.lead.center { margin-left: auto; margin-right: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: 1px solid transparent; transition: all .22s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 24px rgba(26,115,232,.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(26,115,232,.5); color: #fff; }
.btn-ghost { background: transparent; border-color: var(--line-strong); color: var(--text); }
.btn-ghost:hover { border-color: var(--cyan); color: #fff; background: rgba(0,180,216,.08); }
.btn-lg { padding: 15px 32px; font-size: 16px; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(10, 20, 32, .82);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 28px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 11px; }
.logo { width: 30px; height: 27px; }
.brand-text { font-size: 18px; font-weight: 700; color: #fff; letter-spacing: .02em; display: flex; align-items: baseline; gap: 8px; }
.brand-sub { font-size: 11px; font-weight: 500; color: var(--text-3); letter-spacing: .04em; }

.nav { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.nav-link {
  position: relative; padding: 8px 15px; border-radius: 8px;
  color: var(--text-2); font-size: 15px; transition: color .2s;
}
.nav-link:hover { color: #fff; }
.nav-link.active { color: #fff; background: rgba(255,255,255,.06); }
.nav-link.active::after {
  content: ""; position: absolute; left: 15px; right: 15px; bottom: 3px;
  height: 2px; border-radius: 2px; background: var(--grad);
}
.header-cta { margin-left: 6px; }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; width: 40px; height: 40px; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; height: 2px; width: 22px; background: #fff; border-radius: 2px; transition: .25s;
}
.nav-toggle span { position: relative; margin: 0 auto; }
.nav-toggle span::before { position: absolute; top: -6px; left: 0; }
.nav-toggle span::after { position: absolute; top: 6px; left: 0; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 92vh;
  display: flex; align-items: center;
  padding: 140px 0 90px; overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: -2; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; }
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(90deg, rgba(7,14,24,.94) 0%, rgba(9,18,30,.82) 42%, rgba(9,18,30,.45) 100%),
    linear-gradient(180deg, rgba(7,14,24,.5) 0%, rgba(7,14,24,.25) 60%, var(--bg) 100%);
}
.hero-inner { max-width: 680px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-radius: 999px; font-size: 13px; font-weight: 600;
  color: var(--cyan-2); background: rgba(0,180,216,.1); border: 1px solid rgba(0,180,216,.3);
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(34px, 5.4vw, 58px); line-height: 1.14; font-weight: 800;
  letter-spacing: -.02em; color: #fff; margin-bottom: 20px;
}
.hero h1 .grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.sub { font-size: 18px; color: var(--text-2); max-width: 560px; margin-bottom: 34px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-meta { display: flex; gap: 34px; margin-top: 46px; flex-wrap: wrap; }
.hero-meta .m b { display: block; font-size: 26px; font-weight: 700; color: #fff; }
.hero-meta .m span { font-size: 13px; color: var(--text-3); }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 28px;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--line-strong); box-shadow: var(--shadow); }

.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.icon-tile {
  width: 48px; height: 48px; border-radius: 12px;
  display: grid; place-items: center; font-size: 22px;
  background: var(--grad-soft); border: 1px solid var(--line-strong);
  margin-bottom: 18px;
}
.card h3 { font-size: 19px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.card p { color: var(--text-2); font-size: 15px; }

.tag {
  display: inline-flex; padding: 4px 12px; border-radius: 999px;
  font-size: 12.5px; font-weight: 600; color: var(--cyan-2);
  background: rgba(0,180,216,.1); border: 1px solid rgba(0,180,216,.24);
}

/* ---------- 板块标题 ---------- */
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 40px; flex-wrap: wrap; }
.sec-head .link { font-size: 15px; color: var(--cyan-2); font-weight: 600; white-space: nowrap; }
.sec-head .link:hover { color: #fff; }

/* ---------- 落地范式：六类场景 ---------- */
.scene-card { position: relative; overflow: hidden; }
.scene-card .k { font-size: 13px; color: var(--cyan-2); font-weight: 700; letter-spacing: .08em; margin-bottom: 6px; }
.scene-card .mean { font-size: 15px; color: var(--text-2); margin-bottom: 14px; }
.scene-card ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.scene-card ul li { position: relative; padding-left: 16px; font-size: 14px; color: var(--text-2); }
.scene-card ul li::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); opacity: .7; }

/* ---------- 步骤 ---------- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: step; }
.step { position: relative; padding: 26px 22px; border-radius: var(--radius-lg); background: var(--card); border: 1px solid var(--line); }
.step .n {
  width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center;
  font-size: 18px; font-weight: 700; color: #fff; background: var(--grad);
  margin-bottom: 16px; box-shadow: 0 6px 18px rgba(26,115,232,.4);
}
.step h4 { font-size: 17px; color: #fff; margin-bottom: 8px; }
.step p { font-size: 14px; color: var(--text-2); }
.step .out { margin-top: 12px; font-size: 13px; color: var(--text-3); }
.step .out b { color: var(--cyan-2); font-weight: 600; }

/* ---------- 折叠面板（行业） ---------- */
details.industry {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 16px;
}
details.industry summary {
  list-style: none; cursor: pointer; padding: 22px 26px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 17px; font-weight: 700; color: #fff;
}
details.industry summary::-webkit-details-marker { display: none; }
details.industry summary .ic { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center; font-size: 19px; background: var(--grad-soft); border: 1px solid var(--line-strong); }
details.industry summary .meta { margin-left: auto; font-size: 13px; font-weight: 500; color: var(--text-3); display: flex; gap: 14px; }
details.industry summary .arr { transition: transform .25s; color: var(--cyan-2); }
details.industry[open] summary .arr { transform: rotate(180deg); }
details.industry .body { padding: 0 26px 26px; border-top: 1px solid var(--line); padding-top: 20px; }
details.industry .vars { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 18px; }
details.industry .vars .v { background: var(--bg-3); border-radius: 10px; padding: 12px 14px; }
details.industry .vars .v b { display: block; font-size: 12px; color: var(--cyan-2); margin-bottom: 4px; letter-spacing: .04em; }
details.industry .vars .v span { font-size: 13px; color: var(--text-2); }
details.industry .scenes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 22px; }
details.industry .scenes .s { font-size: 14px; color: var(--text-2); padding-left: 14px; position: relative; }
details.industry .scenes .s::before { content: ""; position: absolute; left: 0; top: 10px; width: 6px; height: 6px; border-radius: 2px; background: var(--blue-2); }
details.industry .scenes .s b { color: var(--text); font-weight: 600; }

/* ---------- 表格 ---------- */
.tbl-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-lg); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 640px; }
.tbl th, .tbl td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); }
.tbl th { background: var(--bg-3); color: var(--text); font-weight: 600; white-space: nowrap; font-size: 13.5px; }
.tbl td { color: var(--text-2); }
.tbl tr:last-child td { border-bottom: 0; }
.tbl .ok { color: var(--green); font-weight: 600; }
.tbl .mid { color: var(--gold); font-weight: 600; }

/* ---------- 新闻 ---------- */
.news-item {
  display: block; padding: 30px 28px; border: 1px solid var(--line);
  border-radius: var(--radius-lg); background: var(--card);
  margin-bottom: 20px; transition: transform .22s, border-color .22s;
  color: var(--text);
}
.news-item:hover { transform: translateY(-3px); border-color: var(--line-strong); color: var(--text); }
.news-item .top { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.news-item .date { font-size: 13px; color: var(--text-3); }
.news-item h3 { font-size: 20px; color: #fff; margin-bottom: 10px; line-height: 1.4; }
.news-item .src { font-size: 13px; color: var(--text-3); margin-bottom: 12px; }
.news-item .sum { color: var(--text-2); font-size: 15px; margin-bottom: 16px; }
.news-eval {
  border-left: 3px solid var(--cyan); background: var(--grad-soft);
  padding: 14px 18px; border-radius: 0 12px 12px 0; font-size: 14.5px; color: var(--text-2);
}
.news-eval b { color: var(--cyan-2); font-weight: 700; margin-right: 6px; }
.news-filter { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.chip {
  padding: 8px 18px; border-radius: 999px; font-size: 14px; cursor: pointer;
  background: var(--card); border: 1px solid var(--line); color: var(--text-2);
  transition: all .2s;
}
.chip:hover { color: #fff; border-color: var(--line-strong); }
.chip.active { background: var(--grad); color: #fff; border-color: transparent; }

/* ---------- 关于 ---------- */
.values .card { text-align: left; }
.stat-band { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.stat-band .card { text-align: center; }
.stat-band .card b { font-size: 34px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 联系 ---------- */
.contact-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 30px; align-items: start; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; color: var(--text-2); margin-bottom: 7px; font-weight: 500; }
.form-group input, .form-group textarea {
  width: 100%; padding: 13px 16px; border-radius: 10px;
  background: var(--bg-3); border: 1px solid var(--line-strong);
  color: var(--text); font-size: 15px; font-family: var(--font);
  transition: border-color .2s;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--cyan); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-hint { font-size: 13px; color: var(--text-3); margin-top: 6px; }
.qr-card { text-align: center; padding: 30px 26px; }
.qr-card .qr { width: 200px; height: 200px; margin: 0 auto 16px; border-radius: 14px; padding: 10px; background: #fff; }
.qr-card .qr img { border-radius: 8px; }
.info-list { list-style: none; display: flex; flex-direction: column; gap: 18px; }
.info-list li { display: flex; gap: 14px; align-items: flex-start; }
.info-list .ico { width: 42px; height: 42px; flex: none; border-radius: 11px; display: grid; place-items: center; font-size: 19px; background: var(--grad-soft); border: 1px solid var(--line-strong); }
.info-list b { display: block; font-size: 15px; color: #fff; margin-bottom: 2px; }
.info-list span { font-size: 14px; color: var(--text-2); }

/* ---------- CTA ---------- */
.cta-band {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  padding: 60px 40px; text-align: center;
  background: linear-gradient(135deg, rgba(26,115,232,.22), rgba(0,180,216,.16));
  border: 1px solid var(--line-strong);
}
.cta-band h2 { font-size: clamp(24px, 3.4vw, 34px); color: #fff; margin-bottom: 12px; }
.cta-band p { color: var(--text-2); margin-bottom: 26px; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-2); margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.3fr; gap: 34px; padding: 60px 24px 40px; }
.footer-brand .brand { margin-bottom: 14px; }
.footer-brand p { font-size: 14px; color: var(--text-3); max-width: 300px; }
.footer-col h4 { font-size: 14px; color: #fff; margin-bottom: 16px; letter-spacing: .04em; }
.footer-col a, .footer-col p { display: block; font-size: 14px; color: var(--text-3); margin-bottom: 10px; }
.footer-col a:hover { color: var(--cyan-2); }
.footer-bottom { border-top: 1px solid var(--line); padding: 20px 24px; text-align: center; }
.footer-bottom p { font-size: 13px; color: var(--text-3); }
.footer-bottom a { color: var(--text-3); }
.footer-bottom a:hover { color: var(--cyan-2); }

/* ---------- 页面头（内页） ---------- */
.page-hero {
  position: relative; padding: 168px 0 74px; overflow: hidden;
}
.page-hero .bg { position: absolute; inset: 0; z-index: -2; }
.page-hero .bg img { width: 100%; height: 100%; object-fit: cover; }
.page-hero .bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7,14,24,.9) 0%, rgba(7,14,24,.78) 50%, var(--bg) 100%);
}
.page-hero h1 { font-size: clamp(30px, 4.6vw, 46px); font-weight: 800; color: #fff; margin-bottom: 14px; letter-spacing: -.01em; }
.page-hero .sub { font-size: 17px; color: var(--text-2); max-width: 680px; }

/* 面包屑 */
.crumbs { font-size: 13.5px; color: var(--text-3); margin-bottom: 26px; }
.crumbs a { color: var(--text-2); }
.crumbs a:hover { color: #fff; }
.crumbs .sep { margin: 0 8px; opacity: .5; }

/* ---------- 目录锚点 ---------- */
.toc { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 40px; }
.toc a {
  padding: 8px 16px; border-radius: 999px; font-size: 13.5px;
  color: var(--text-2); background: var(--card); border: 1px solid var(--line);
}
.toc a:hover { color: #fff; border-color: var(--cyan); }

/* ---------- 悬浮客服按钮 ---------- */
.fab-kf {
  position: fixed; right: 24px; bottom: 26px; z-index: 90;
  width: 56px; height: 56px; border-radius: 50%;
  display: grid; place-items: center; font-size: 24px;
  background: linear-gradient(135deg, #07c160, #06ad56); color: #fff;
  box-shadow: 0 8px 24px rgba(7,193,96,.4); transition: transform .2s;
}
.fab-kf:hover { transform: scale(1.08); color: #fff; }

/* ---------- 回到顶部 / 出现动画 ---------- */
.to-top {
  position: fixed; right: 26px; bottom: 96px; z-index: 90;
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--line-strong);
  background: var(--card); color: var(--text-2); display: grid; place-items: center;
  cursor: pointer; opacity: 0; pointer-events: none; transition: all .25s;
}
.to-top.show { opacity: 1; pointer-events: auto; }
.to-top:hover { color: #fff; border-color: var(--cyan); }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  details.industry .vars { grid-template-columns: repeat(2, 1fr); }
  details.industry .scenes { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .section { padding: 60px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .hero { min-height: 0; padding: 120px 0 70px; }
  .hero-meta { gap: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }

  .nav {
    position: fixed; top: 68px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: rgba(10,20,32,.98); border-bottom: 1px solid var(--line);
    padding: 12px 16px 18px; transform: translateY(-8px);
    opacity: 0; pointer-events: none; transition: .25s;
  }
  .nav.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-link { padding: 13px 14px; font-size: 16px; }
  .header-cta { display: none; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-toggle.open span { background: transparent; }
  .nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
  .nav-toggle.open span::after { top: 0; transform: rotate(-45deg); }
}