/* ============================================================
   灵境 LingJing · 官网设计系统
   风格参照: Apple(大留白/巨字排版/毛玻璃导航) × Samsung(产品色块/横向叙事)
   上线前: 全局替换 www.example.com 为正式域名
   ============================================================ */
:root {
  --ink: #1d1d1f;            /* 主文字(浅色区) */
  --ink-2: #6e6e73;          /* 次级文字(浅色区) */
  --paper: #ffffff;
  --paper-2: #f5f5f7;        /* 苹果灰 */
  --coal: #0a0a0c;           /* 深色区背景 */
  --coal-2: #151518;
  --snow: #f5f5f7;           /* 深色区主文字 */
  --snow-2: #a1a1a6;         /* 深色区次级文字 */
  --line: rgba(0, 0, 0, .08);
  --line-dark: rgba(255, 255, 255, .12);
  --brand: #5a5ce0;
  --brand-2: #8b5cf6;
  --brand-3: #a855f7;
  --gold: #f5b94c;
  --grad: linear-gradient(120deg, #5a5ce0 0%, #8b5cf6 55%, #a855f7 100%);
  --grad-text: linear-gradient(110deg, #5a5ce0 5%, #8b5cf6 45%, #c084fc 90%);
  --radius: 22px;
  --shadow: 0 24px 60px -24px rgba(29, 29, 31, .25);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro SC",
          "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei",
          "Noto Sans SC", sans-serif;
  --nav-h: 52px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

::selection { background: rgba(139, 92, 246, .22); }

/* ---------------- 导航 ---------------- */
.site-nav {
  position: fixed; inset: 0 0 auto; z-index: 100;
  height: var(--nav-h);
  background: rgba(255, 255, 255, .72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, .06);
}
.site-nav .wrap { height: 100%; display: flex; align-items: center; gap: 28px; }
.logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 19px; font-weight: 700; letter-spacing: .5px;
}
.logo .glyph {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--grad);
  display: grid; place-items: center;
  color: #fff; font-size: 15px; font-weight: 800;
}
.logo small { font-size: 10px; font-weight: 500; color: var(--ink-2); letter-spacing: 2.5px; display: block; line-height: 1; margin-top: 2px; }
.nav-links { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.nav-links a {
  font-size: 14px; color: rgba(29, 29, 31, .78);
  transition: color .2s;
}
.nav-links a:hover, .nav-links a.on { color: var(--ink); }
.nav-cta {
  padding: 7px 18px !important;
  border-radius: 999px;
  background: var(--ink); color: #fff !important;
  font-weight: 500;
  transition: transform .2s, opacity .2s;
}
.nav-cta:hover { transform: scale(1.04); color: #fff !important; }
.burger { display: none; background: none; border: 0; cursor: pointer; padding: 8px; margin-left: auto; }
.burger span { display: block; width: 20px; height: 1.6px; background: var(--ink); margin: 5px 0; border-radius: 2px; transition: .25s; }

/* ---------------- 通用段落 ---------------- */
section { padding: 110px 0; }
.sec-head { max-width: 760px; margin-bottom: 56px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: 2.5px;
  color: var(--brand); margin-bottom: 18px;
  text-transform: uppercase;
}
.eyebrow.gold { color: var(--gold); }
.eyebrow::before { content: ''; width: 22px; height: 2px; background: currentColor; border-radius: 2px; }
h1, h2, h3 { letter-spacing: -.02em; line-height: 1.12; font-weight: 700; }
h2 { font-size: clamp(32px, 4.6vw, 54px); }
h3 { font-size: 21px; letter-spacing: -.01em; }
.lead { font-size: clamp(17px, 2vw, 21px); color: var(--ink-2); margin-top: 18px; max-width: 640px; }
.grad-text { background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.gold-text { background: linear-gradient(110deg, #f7d774, #f5b94c 60%, #f59e0b); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* 深色段落 */
.dark { background: var(--coal); color: var(--snow); }
.dark .lead { color: var(--snow-2); }
.dark .site-note { color: var(--snow-2); }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px;
  font-size: 16px; font-weight: 500;
  transition: transform .2s, box-shadow .2s, background .2s;
  cursor: pointer; border: 0;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--grad); color: #fff; box-shadow: 0 12px 30px -10px rgba(124, 92, 246, .55); }
.btn.primary:hover { box-shadow: 0 16px 36px -10px rgba(124, 92, 246, .65); }
.btn.ghost { border: 1px solid rgba(29, 29, 31, .25); color: var(--ink); }
.btn.ghost:hover { background: rgba(0, 0, 0, .04); }
.dark .btn.ghost { border-color: rgba(255, 255, 255, .3); color: var(--snow); }
.dark .btn.ghost:hover { background: rgba(255, 255, 255, .08); }
.btn .arr { transition: transform .2s; }
.btn:hover .arr { transform: translateX(3px); }

/* ---------------- Hero ---------------- */
.hero {
  padding: calc(var(--nav-h) + 92px) 0 96px;
  background:
    radial-gradient(1000px 460px at 82% -10%, rgba(139, 92, 246, .14), transparent 60%),
    radial-gradient(760px 420px at 8% 8%, rgba(90, 92, 224, .08), transparent 55%),
    linear-gradient(#ffffff, var(--paper-2));
  text-align: center;
}
.hero .eyebrow { justify-content: center; }
.hero .eyebrow::before { display: none; }
.hero .tag-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 16px; border-radius: 999px;
  background: rgba(90, 92, 224, .08);
  border: 1px solid rgba(90, 92, 224, .18);
  color: var(--brand); font-size: 13.5px; font-weight: 500;
}
.hero h1 {
  font-size: clamp(44px, 7.6vw, 92px);
  letter-spacing: -.035em;
  margin: 26px 0 0;
}
.hero .sub {
  font-size: clamp(18px, 2.3vw, 24px);
  color: var(--ink-2);
  margin: 22px auto 0; max-width: 760px;
}
.hero .cta-row { display: flex; gap: 16px; justify-content: center; margin-top: 38px; flex-wrap: wrap; }

/* 产品双卡 */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 72px; text-align: left; }
.product-card {
  border-radius: 28px; padding: 34px 34px 30px;
  position: relative; overflow: hidden;
  transition: transform .3s, box-shadow .3s;
  border: 1px solid var(--line);
  background: #fff;
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.product-card .pc-kicker { font-size: 12.5px; letter-spacing: 2.5px; font-weight: 600; color: var(--brand); }
.product-card.vision .pc-kicker { color: #d99a1f; }
.product-card h3 { font-size: clamp(24px, 2.6vw, 32px); margin: 10px 0 8px; }
.product-card p { color: var(--ink-2); font-size: 15.5px; }
.product-card .pc-go {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 20px; font-weight: 600; color: var(--brand);
  font-size: 15.5px;
}
.product-card.vision .pc-go { color: #b97c10; }
.product-card .pc-go:hover .arr { transform: translateX(4px); }
.product-card .arr { transition: transform .2s; }
.product-card .pc-art { margin: 26px -6px 0; }

/* ---------------- 产品特写区 ---------------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 56px; }
.feat {
  background: var(--paper-2); border-radius: var(--radius);
  padding: 30px 28px;
  transition: transform .25s, background .25s;
}
.feat:hover { transform: translateY(-4px); background: #eef0f6; }
.dark .feat { background: var(--coal-2); }
.dark .feat:hover { background: #1b1b20; }
.feat .f-ico { font-size: 26px; margin-bottom: 14px; }
.feat h3 { font-size: 18.5px; margin-bottom: 8px; }
.feat p { font-size: 15px; color: var(--ink-2); }
.dark .feat p { color: var(--snow-2); }

/* 产品分屏行(图文交替) */
.split-row { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; padding: 64px 0; }
.split-row + .split-row { border-top: 1px solid var(--line); }
.dark .split-row + .split-row { border-color: var(--line-dark); }
.split-row .sr-copy h3 { font-size: clamp(24px, 3vw, 34px); margin-bottom: 14px; }
.split-row .sr-copy p { color: var(--ink-2); }
.dark .split-row .sr-copy p { color: var(--snow-2); }
.split-row .sr-copy ul { margin-top: 16px; list-style: none; }
.split-row .sr-copy li { padding: 7px 0 7px 26px; position: relative; font-size: 15.5px; color: var(--ink-2); }
.dark .split-row .sr-copy li { color: var(--snow-2); }
.split-row .sr-copy li::before {
  content: '✓'; position: absolute; left: 0; top: 7px;
  width: 18px; height: 18px; border-radius: 50%;
  background: rgba(90, 92, 224, .12); color: var(--brand);
  font-size: 11px; display: grid; place-items: center; font-weight: 700;
}
.dark .split-row .sr-copy li::before { background: rgba(245, 185, 76, .14); color: var(--gold); }
.split-row.flip .sr-art { order: 2; }

/* ---------------- 联动架构图 ---------------- */
.flow {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px;
  margin: 60px 0 18px; position: relative;
}
.flow .node {
  background: #fff; border: 1px solid var(--line);
  border-radius: 16px; padding: 20px 16px; text-align: center;
  position: relative;
}
.flow .node .n-ico { font-size: 24px; }
.flow .node .n-t { font-weight: 600; font-size: 15px; margin-top: 8px; }
.flow .node .n-d { font-size: 12.5px; color: var(--ink-2); margin-top: 4px; line-height: 1.5; }
.flow .node::after {
  content: '→'; position: absolute; right: -14px; top: 50%; transform: translateY(-50%);
  color: var(--brand-2); font-weight: 700; font-size: 17px; z-index: 1;
}
.flow .node:last-child::after { display: none; }
.flow .node.hot { border-color: rgba(245, 185, 76, .55); background: #fffaf0; }
.flow-note { font-size: 13.5px; color: var(--ink-2); text-align: center; }

/* ---------------- 数字带 ---------------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
.stat .s-num {
  font-size: clamp(34px, 4.6vw, 56px); font-weight: 800; letter-spacing: -.03em;
  background: var(--grad-text); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.dark .stat .s-num { background: linear-gradient(110deg, #f7d774, #f5b94c 70%); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat .s-label { font-size: 14.5px; color: var(--ink-2); margin-top: 6px; }
.dark .stat .s-label { color: var(--snow-2); }

/* ---------------- 场景横向卡 ---------------- */
.scene-scroll { display: grid; grid-auto-flow: column; grid-auto-columns: 300px; gap: 18px; overflow-x: auto; padding: 8px 4px 24px; scroll-snap-type: x mandatory; }
.scene-scroll::-webkit-scrollbar { height: 6px; }
.scene-scroll::-webkit-scrollbar-thumb { background: rgba(120, 120, 128, .3); border-radius: 3px; }
.scene {
  scroll-snap-align: start;
  border-radius: var(--radius); padding: 28px 26px;
  border: 1px solid var(--line); background: #fff;
}
.scene .sc-ico { font-size: 30px; }
.scene h3 { font-size: 18px; margin: 14px 0 8px; }
.scene p { font-size: 14px; color: var(--ink-2); }
.scene .sc-tag { display: inline-block; margin-top: 14px; font-size: 12px; color: var(--brand); background: rgba(90, 92, 224, .08); border-radius: 999px; padding: 4px 12px; }

/* ---------------- FAQ ---------------- */
.faq-list { max-width: 820px; margin: 0 auto; }
details {
  border-bottom: 1px solid var(--line);
  padding: 6px 0;
}
details summary {
  cursor: pointer; list-style: none;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 20px 4px; font-size: 18px; font-weight: 600;
}
details summary::-webkit-details-marker { display: none; }
details summary .plus { color: var(--brand); font-size: 22px; font-weight: 400; transition: transform .25s; flex-shrink: 0; }
details[open] summary .plus { transform: rotate(45deg); }
details .answer { padding: 0 4px 22px; color: var(--ink-2); font-size: 16px; max-width: 760px; }

/* ---------------- CTA 带 ---------------- */
.cta-band {
  background:
    radial-gradient(720px 320px at 18% 0%, rgba(245, 185, 76, .16), transparent 60%),
    radial-gradient(720px 340px at 85% 100%, rgba(139, 92, 246, .3), transparent 60%),
    var(--coal);
  color: var(--snow); text-align: center;
}
.cta-band h2 { font-size: clamp(30px, 4.4vw, 52px); }
.cta-band .lead { margin: 18px auto 34px; color: var(--snow-2); }
.cta-band .cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------------- 页脚 ---------------- */
.site-footer { background: #f5f5f7; color: #6e6e73; font-size: 13.5px; padding: 56px 0 40px; }
.site-footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 36px; border-bottom: 1px solid var(--line); }
.site-footer h4 { font-size: 13px; color: var(--ink); margin-bottom: 14px; }
.site-footer ul { list-style: none; }
.site-footer li { margin: 9px 0; }
.site-footer a:hover { color: var(--ink); text-decoration: underline; }
.site-footer .brand-blurb { max-width: 300px; margin-top: 12px; line-height: 1.7; }
.site-footer .legal { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; padding-top: 22px; }

/* ---------------- 产品页 Hero ---------------- */
.p-hero { padding: calc(var(--nav-h) + 88px) 0 84px; text-align: center; }
.p-hero.light { background: linear-gradient(#fff, var(--paper-2)); }
.p-hero.dark { background: var(--coal); color: var(--snow); }
.p-hero.dark .lead { color: var(--snow-2); }
.p-hero h1 { font-size: clamp(40px, 6.4vw, 80px); letter-spacing: -.03em; }
.p-hero .lead { margin: 20px auto 0; }
.p-hero .cta-row { display: flex; gap: 14px; justify-content: center; margin-top: 34px; flex-wrap: wrap; }

/* 面包屑 */
.crumb { font-size: 13px; color: var(--ink-2); padding: calc(var(--nav-h) + 18px) 0 0; }
.crumb a:hover { color: var(--brand); }

/* ---------------- 插图容器 ---------------- */
.shot {
  border-radius: 24px; overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: #12101c;
}
.dark .shot { border-color: var(--line-dark); }

/* ---------------- 入场动效(渐进增强: 仅在 JS 可用时启用初始隐藏) ---------------- */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.in { opacity: 1; transform: none; }
.d1 { transition-delay: .08s; } .d2 { transition-delay: .16s; } .d3 { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 960px) {
  section { padding: 78px 0; }
  .duo { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .split-row { grid-template-columns: 1fr; gap: 34px; padding: 48px 0; }
  .split-row.flip .sr-art { order: 0; }
  .flow { grid-template-columns: 1fr; }
  .flow .node::after { content: '↓'; right: 50%; transform: translate(50%, 0); top: auto; bottom: -22px; }
  .stats { grid-template-columns: 1fr 1fr; gap: 34px 16px; }
  .site-footer .cols { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .nav-links {
    display: none;
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    background: rgba(255, 255, 255, .96);
    -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px);
    flex-direction: column; align-items: flex-start;
    padding: 18px 24px 26px; gap: 18px;
    border-bottom: 1px solid var(--line);
  }
  .nav-links.open { display: flex; }
  .burger { display: block; }
  .feature-grid { grid-template-columns: 1fr; }
  .hero { padding-top: calc(var(--nav-h) + 64px); }
  body { font-size: 16px; }
}