/* ==========================================================================
   知芒数字科技 ZhiMang Digital — 官网样式
   纯静态 / 零依赖 / 响应式
   ========================================================================== */

:root {
  --bg-dark: #0a1120;
  --bg-dark-2: #0e1730;
  --bg-light: #f6f8fc;
  --bg-white: #ffffff;
  --ink: #1a2233;
  --ink-2: #4b5568;
  --ink-3: #8b93a7;
  --line: #e4e9f2;
  --primary: #2f6bff;
  --primary-2: #6d4aff;
  --accent: #17c3b2;
  --grad: linear-gradient(120deg, #2f6bff 0%, #6d4aff 55%, #a44dff 100%);
  --grad-soft: linear-gradient(120deg, rgba(47,107,255,.12), rgba(109,74,255,.12));
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 30px rgba(20, 35, 80, .10);
  --shadow-lg: 0 20px 60px rgba(20, 35, 80, .16);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Consolas, monospace;
  --nav-h: 72px;
}

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

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

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

img, svg { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-2); }
ul { list-style: none; }

.container { width: min(1180px, 92%); margin: 0 auto; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(10, 17, 32, .72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.08);
  transition: background .3s;
}
.nav-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand svg { width: 38px; height: 38px; }
.brand-name { font-size: 20px; font-weight: 700; letter-spacing: .02em; }
.brand-sub { font-size: 11px; color: rgba(255,255,255,.55); letter-spacing: .12em; text-transform: uppercase; margin-top: -2px; }

.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a { color: rgba(255,255,255,.82); font-size: 15px; font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: #fff; }
.nav-links a.active { position: relative; }
.nav-links a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -10px; height: 2px;
  background: var(--grad); border-radius: 2px;
}

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer; border: none;
  transition: transform .2s, box-shadow .2s, background .2s;
  line-height: 1.4; white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 6px 20px rgba(80, 90, 255, .35); }
.btn-primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 10px 28px rgba(80, 90, 255, .45); }
.btn-ghost { background: rgba(255,255,255,.08); color: #fff; border: 1px solid rgba(255,255,255,.22); }
.btn-ghost:hover { color: #fff; background: rgba(255,255,255,.16); transform: translateY(-2px); }
.btn-light { background: #fff; color: var(--ink); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }

/* 移动端菜单 */
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 6px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: #fff; margin: 5px 0; border-radius: 2px; transition: .3s; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: var(--bg-dark);
  color: #fff;
  padding: calc(var(--nav-h) + 84px) 0 96px;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(640px 420px at 78% 18%, rgba(109,74,255,.28), transparent 60%),
    radial-gradient(560px 400px at 12% 82%, rgba(47,107,255,.30), transparent 60%),
    radial-gradient(300px 240px at 55% 110%, rgba(23,195,178,.14), transparent 60%);
  pointer-events: none;
}
.hero-grid {
  position: absolute; inset: 0; opacity: .5;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 30%, transparent 75%);
}
.hero-inner { position: relative; z-index: 2; text-align: center; max-width: 880px; margin: 0 auto; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-radius: 999px;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16);
  font-size: 13.5px; color: rgba(255,255,255,.85); margin-bottom: 26px;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }

.hero h1 {
  font-size: clamp(34px, 5.4vw, 58px);
  font-weight: 800; line-height: 1.22; letter-spacing: .01em;
}
.hero h1 .grad-text {
  background: linear-gradient(100deg, #6aa5ff, #a78bff 55%, #62e6d6);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead {
  margin: 22px auto 0; max-width: 640px;
  font-size: 17.5px; color: rgba(255,255,255,.72);
}
.hero-cta { margin-top: 36px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.hero-stats {
  margin-top: 64px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
.stat {
  background: rgba(255,255,255,.055); border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius); padding: 22px 12px;
}
.stat b { display: block; font-size: 30px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { font-size: 13px; color: rgba(255,255,255,.6); }

/* ---------- 通用区块 ---------- */
.section { padding: 92px 0; }
.section.alt { background: var(--bg-light); }
.section-head { max-width: 720px; margin-bottom: 54px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 700; letter-spacing: .14em;
  color: var(--primary); text-transform: uppercase; margin-bottom: 12px;
}
.section-head h2 { font-size: clamp(26px, 3.4vw, 36px); font-weight: 800; line-height: 1.3; letter-spacing: .01em; }
.section-head p { margin-top: 14px; color: var(--ink-2); font-size: 16.5px; }

/* ---------- 卡片网格 ---------- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }

.card {
  background: var(--bg-white); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 28px;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card .icon {
  width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  background: var(--grad-soft); color: var(--primary); margin-bottom: 20px; font-size: 24px;
}
.card h3 { font-size: 19px; font-weight: 700; margin-bottom: 10px; }
.card p { color: var(--ink-2); font-size: 15px; }
.card .tag {
  display: inline-block; font-size: 12px; color: var(--primary); background: rgba(47,107,255,.08);
  padding: 3px 10px; border-radius: 999px; margin-bottom: 14px; font-weight: 600;
}

/* ---------- 关于 ---------- */
.about-wrap { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.about-copy h2 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; line-height: 1.35; margin-bottom: 20px; }
.about-copy p { color: var(--ink-2); margin-bottom: 16px; }
.mission-cards { display: grid; gap: 14px; margin-top: 10px; }
.mission-card {
  display: flex; gap: 14px; background: var(--bg-white);
  border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 16px 18px;
}
.mission-card .m-icon { width: 40px; height: 40px; flex: 0 0 40px; border-radius: 11px; background: var(--grad-soft); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 19px; }
.mission-card b { display: block; font-size: 15.5px; }
.mission-card span { font-size: 13.5px; color: var(--ink-3); }

/* ---------- 产品横幅 ---------- */
.product-banner {
  position: relative; overflow: hidden; border-radius: 24px;
  background: linear-gradient(120deg, #131b3a 0%, #1c1f4d 60%, #2a1d55 100%);
  color: #fff; padding: 64px 56px;
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center;
}
.product-banner::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(500px 320px at 88% 10%, rgba(109,74,255,.35), transparent 60%),
              radial-gradient(400px 300px at 10% 100%, rgba(47,107,255,.28), transparent 60%);
}
.product-banner > * { position: relative; z-index: 2; }
.product-banner .p-badge {
  display: inline-block; font-size: 12.5px; letter-spacing: .1em; font-weight: 700;
  color: #9fd8ff; background: rgba(47,107,255,.22); border: 1px solid rgba(102,170,255,.35);
  padding: 5px 14px; border-radius: 999px; margin-bottom: 18px;
}
.product-banner h3 { font-size: clamp(24px, 3vw, 32px); font-weight: 800; line-height: 1.3; }
.product-banner p { color: rgba(255,255,255,.72); margin-top: 14px; font-size: 15.5px; }
.product-banner .btns { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }
.product-visual {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.14);
  border-radius: 18px; padding: 26px; font-family: var(--mono); font-size: 13px;
}
.product-visual .pv-line { display: flex; align-items: center; gap: 10px; padding: 7px 0; color: rgba(255,255,255,.75); border-bottom: 1px dashed rgba(255,255,255,.1); }
.product-visual .pv-line:last-child { border-bottom: 0; }
.product-visual .pv-ok { color: #5eead4; }
.product-visual .pv-x { color: #fda4af; }

/* ---------- 优势 ---------- */
.advantage {
  display: flex; gap: 18px; background: var(--bg-white);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px;
  transition: transform .25s, box-shadow .25s;
}
.advantage:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.advantage .num {
  flex: 0 0 44px; width: 44px; height: 44px; border-radius: 50%;
  background: var(--grad); color: #fff; font-weight: 800; font-size: 17px;
  display: flex; align-items: center; justify-content: center;
}
.advantage b { display: block; font-size: 16.5px; margin-bottom: 6px; }
.advantage p { color: var(--ink-2); font-size: 14.5px; }

/* ---------- CTA ---------- */
.cta {
  position: relative; overflow: hidden; text-align: center;
  background: var(--bg-dark); color: #fff; padding: 84px 0;
}
.cta::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(560px 300px at 50% 0%, rgba(109,74,255,.3), transparent 65%);
}
.cta h2 { position: relative; font-size: clamp(24px, 3.2vw, 34px); font-weight: 800; }
.cta p { position: relative; color: rgba(255,255,255,.7); margin: 16px auto 30px; max-width: 560px; }
.cta .btns { position: relative; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.footer { background: #070d1c; color: rgba(255,255,255,.62); padding: 64px 0 30px; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 44px; border-bottom: 1px solid rgba(255,255,255,.08); }
.footer .brand { margin-bottom: 16px; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer a { color: rgba(255,255,255,.62); display: block; padding: 5px 0; }
.footer a:hover { color: #fff; }
.footer .f-desc { font-size: 13.5px; line-height: 1.9; }
.footer .f-contact li { display: flex; gap: 10px; padding: 5px 0; align-items: baseline; }
.footer .f-contact .k { color: rgba(255,255,255,.4); min-width: 60px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; padding-top: 26px; font-size: 13px; color: rgba(255,255,255,.4); }
.footer-bottom a { display: inline; color: rgba(255,255,255,.5); padding: 0; }

/* ---------- 子页 Hero ---------- */
.page-hero {
  position: relative; overflow: hidden; background: var(--bg-dark); color: #fff;
  padding: calc(var(--nav-h) + 60px) 0 64px; text-align: center;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(560px 340px at 50% -10%, rgba(109,74,255,.32), transparent 65%);
}
.page-hero h1 { position: relative; font-size: clamp(28px, 4vw, 42px); font-weight: 800; }
.page-hero p { position: relative; color: rgba(255,255,255,.7); max-width: 620px; margin: 14px auto 0; }
.crumb { position: relative; display: inline-flex; gap: 8px; font-size: 13px; color: rgba(255,255,255,.5); margin-bottom: 18px; }
.crumb a { color: rgba(255,255,255,.7); }

/* ---------- 列表/详情 ---------- */
.prose h3 { font-size: 20px; margin: 34px 0 14px; font-weight: 700; }
.prose ul.feature-list li {
  position: relative; padding: 8px 0 8px 26px; color: var(--ink-2);
  border-bottom: 1px dashed var(--line); font-size: 15px;
}
.prose ul.feature-list li:last-child { border-bottom: 0; }
.prose ul.feature-list li::before {
  content: "✦"; position: absolute; left: 2px; top: 8px; color: var(--primary); font-size: 13px;
}
.feature-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; align-items: start; }
.step-list { counter-reset: step; display: grid; gap: 14px; }
.step-list li {
  counter-increment: step; position: relative;
  background: var(--bg-white); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 18px 20px 18px 64px; font-size: 15px; color: var(--ink-2);
}
.step-list li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 20px; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-weight: 800; font-size: 17px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ---------- Timeline ---------- */
.timeline { position: relative; margin-top: 10px; padding-left: 28px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--primary), var(--primary-2)); opacity: .35; }
.timeline li { position: relative; padding: 0 0 22px 18px; }
.timeline li::before { content: ""; position: absolute; left: -28px; top: 7px; width: 12px; height: 12px; border-radius: 50%; background: #fff; border: 3px solid var(--primary); }
.timeline b { display: block; font-size: 15.5px; }
.timeline span { font-size: 13.5px; color: var(--ink-3); }

/* ---------- 表格（信息表） ---------- */
.info-table { width: 100%; border-collapse: collapse; background: var(--bg-white); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); }
.info-table td, .info-table th { padding: 14px 18px; border-bottom: 1px solid var(--line); font-size: 14.5px; text-align: left; vertical-align: top; }
.info-table tr:last-child td { border-bottom: 0; }
.info-table td:first-child { background: var(--bg-light); font-weight: 600; color: var(--ink); width: 160px; }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(24px); 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); }
  .about-wrap, .product-banner, .feature-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; gap: 0; align-items: stretch;
    background: rgba(10, 17, 32, .97); padding: 12px 24px 24px;
    border-bottom: 1px solid rgba(255,255,255,.1);
    transform: translateY(-16px); opacity: 0; pointer-events: none;
    transition: .25s;
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 13px 0; border-bottom: 1px solid rgba(255,255,255,.06); }
  .nav-links a.active::after { display: none; }
  .nav-toggle { display: block; }
}
@media (max-width: 620px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 68px 0; }
  .product-banner { padding: 40px 26px; }
  .hero { padding-top: calc(var(--nav-h) + 56px); }
}