/* ============================================================
   花朵山 GEO — 官网宣传页样式
   视觉体系沿用产品端「暗夜驾驶舱」：深空蓝黑底 + 荧光青强调 + 等宽数字
   站点与后台 SPA 完全解耦（纯静态，内容写在 HTML 里，利于搜索引擎与 AI 抓取）
   ============================================================ */

:root {
  --bg: #0e1420;
  --bg-2: #0b0f17;
  --card: #121826;
  --card-hover: #161d2b;
  --border: #1c2432;
  --border-2: #232c3d;
  --text: #e6ebf2;
  --text-2: #8fa0b8;
  --text-3: #5c6b82;
  --accent: #00d4aa;
  --accent-deep: #0f6e56;
  --accent-dim: #0f2e27;
  --warn: #efb027;
  --down: #f0616d;
  --radius: 10px;
  --wrap: 1180px;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { margin: 0; font-weight: 600; line-height: 1.3; letter-spacing: -0.01em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }

.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 860px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 999;
  background: var(--accent); color: #04241c; padding: 10px 16px; border-radius: 6px;
}
.skip-link:focus { left: 16px; top: 16px; }

/* 占位符（待用户提供的信息）——上线前需全部替换 */
.ph {
  color: var(--warn);
  border-bottom: 1px dashed rgba(239, 176, 39, 0.45);
  font-size: 0.94em;
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 40px; padding: 0 18px; border-radius: 8px;
  font-size: 14px; font-weight: 500; white-space: nowrap;
  border: 1px solid transparent; cursor: pointer;
  transition: background .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}
.btn-lg { height: 48px; padding: 0 26px; font-size: 15px; }
.btn-primary { background: var(--accent); color: #04241c; }
.btn-primary:hover { background: #33ddba; transform: translateY(-1px); }
.btn-outline { border-color: var(--border-2); color: var(--text); background: transparent; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost { color: var(--text-2); }
.btn-ghost:hover { color: var(--accent); }

/* ---------------- 顶部导航 ---------------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease, backdrop-filter .25s ease;
}
.nav.is-stuck {
  background: rgba(11, 15, 23, 0.86);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 32px; height: 68px; }

.brand { display: flex; align-items: center; gap: 10px; flex: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(150deg, var(--accent), var(--accent-deep));
  color: #04241c; display: flex; align-items: center; justify-content: center;
}
.brand-txt { font-size: 17px; letter-spacing: -0.01em; }
.brand-txt b { color: var(--accent); font-weight: 600; }

.nav-links { display: flex; align-items: center; gap: 26px; margin-right: auto; }
.nav-links a { font-size: 14px; color: var(--text-2); transition: color .18s ease; }
.nav-links a:hover { color: var(--text); }
.nav-cta { display: flex; align-items: center; gap: 10px; }

.nav-toggle {
  display: none; width: 40px; height: 40px; margin-left: auto;
  background: transparent; border: 1px solid var(--border-2); border-radius: 8px;
  flex-direction: column; align-items: center; justify-content: center; gap: 4px; cursor: pointer;
}
.nav-toggle span { display: block; width: 16px; height: 1.5px; background: var(--text-2); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* ---------------- Hero ---------------- */
.hero { position: relative; overflow: hidden; padding: 86px 0 96px; }
.hero-glow {
  position: absolute; top: -280px; left: 50%; transform: translateX(-50%);
  width: 1200px; height: 720px; pointer-events: none;
  background: radial-gradient(48% 52% at 50% 45%, rgba(0, 212, 170, 0.16), transparent 70%);
}
.hero-grid {
  position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(35, 44, 61, 0.55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 44, 61, 0.55) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 30%, #000 0%, transparent 78%);
  mask-image: radial-gradient(70% 60% at 50% 30%, #000 0%, transparent 78%);
}
.hero-inner {
  position: relative; display: grid; grid-template-columns: 1.05fr 0.95fr;
  gap: 64px; align-items: center;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 13px; color: var(--text-2);
  background: var(--accent-dim); border: 1px solid rgba(0, 212, 170, 0.22);
  padding: 6px 14px; border-radius: 999px; margin-bottom: 26px;
}
.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.16);
}

.hero h1 {
  font-size: 54px; line-height: 1.18; letter-spacing: -0.03em; margin-bottom: 24px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(96deg, var(--accent) 10%, #6ee7d0 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lede { font-size: 17px; color: var(--text-2); max-width: 30em; margin-bottom: 34px; }
.lede b { color: var(--text); font-weight: 500; }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 46px; }

.hero-facts {
  display: grid; grid-template-columns: repeat(4, auto); gap: 34px;
  padding-top: 26px; border-top: 1px solid var(--border);
}
.hero-facts li { display: flex; flex-direction: column; gap: 3px; }
.hero-facts b {
  font-family: var(--mono); font-size: 22px; font-weight: 500; color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.hero-facts span { font-size: 12px; color: var(--text-3); line-height: 1.5; }

/* Hero 右侧：AI 回答监测示意卡 */
.hero-demo { position: relative; }
.demo-card {
  background: linear-gradient(180deg, var(--card) 0%, #0f1522 100%);
  border: 1px solid var(--border-2); border-radius: 14px; padding: 18px;
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.9);
}
.demo-head { display: flex; align-items: center; gap: 6px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.demo-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border-2); }
.demo-title { margin-left: auto; font-size: 12px; color: var(--text-3); }

.demo-block { padding: 16px 0; border-bottom: 1px solid var(--border); }
.demo-label { font-size: 11px; color: var(--text-3); letter-spacing: .04em; margin-bottom: 8px; }
.demo-q {
  font-size: 13.5px; color: var(--text-2);
  background: var(--bg-2); border-radius: 8px; padding: 11px 13px;
}
.demo-a { font-size: 13.5px; color: var(--text-2); line-height: 1.8; }
.demo-a mark {
  background: var(--accent-dim); color: var(--accent);
  padding: 1px 5px; border-radius: 4px; font-weight: 500;
}
.demo-cite { margin-top: 10px; font-size: 11.5px; color: var(--text-3); }
.demo-cite span {
  font-family: var(--mono); color: var(--accent);
  border: 1px solid rgba(0, 212, 170, 0.3); border-radius: 4px; padding: 0 4px; margin-right: 6px;
}

.demo-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding: 16px 0; }
.dm { background: var(--bg-2); border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; }
.dm-k { font-size: 11px; color: var(--text-3); margin-bottom: 4px; }
.dm-v { font-size: 19px; font-weight: 500; color: var(--text); }
.dm-v span { font-size: 12px; color: var(--text-3); margin-left: 1px; }
.dm-v.up { color: var(--accent); }

.demo-foot { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  font-size: 11px; color: var(--accent); background: var(--accent-dim);
  border: 1px solid rgba(0, 212, 170, 0.22); border-radius: 999px; padding: 3px 10px;
}
.tag-dim { color: var(--text-3); background: var(--bg-2); border-color: var(--border); }

/* ---------------- 通用分节 ---------------- */
.sec { padding: 96px 0; }
.sec-alt { background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.sec-head { max-width: 720px; margin-bottom: 52px; }
.sec-kicker {
  display: inline-block; font-size: 13px; color: var(--accent);
  letter-spacing: .06em; margin-bottom: 14px;
}
.sec-head h2 { font-size: 34px; letter-spacing: -0.02em; margin-bottom: 16px; }
.sec-sub { font-size: 15.5px; color: var(--text-2); }

/* ---------------- 卡片 ---------------- */
.cards-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cards-6 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px;
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
}
.card:hover { border-color: var(--border-2); background: var(--card-hover); transform: translateY(-2px); }
.card h3 { font-size: 17px; margin-bottom: 12px; }
.card p { font-size: 14px; color: var(--text-2); line-height: 1.75; }

.card-icon {
  width: 40px; height: 40px; border-radius: 10px; margin-bottom: 18px;
  background: var(--accent-dim); border: 1px solid rgba(0, 212, 170, 0.2);
  display: flex; align-items: center; justify-content: center; color: var(--accent);
}
.card-icon svg { width: 20px; height: 20px; }

.card.ic { display: flex; flex-direction: column; }
.ic-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.ic-num { font-size: 12px; color: var(--text-3); letter-spacing: .08em; }
.ic-svg { width: 22px; height: 22px; color: var(--accent); opacity: .85; }
.ic-foot {
  margin-top: auto; padding-top: 18px; font-size: 12.5px; color: var(--accent);
  border-top: 1px dashed var(--border-2); margin-top: 20px;
}

/* ---------------- 对比表 ---------------- */
.cmp-wrap {
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; background: var(--card);
}
.cmp { width: 100%; border-collapse: collapse; }
.cmp th, .cmp td { padding: 17px 22px; text-align: left; font-size: 14px; vertical-align: top; }
.cmp thead th {
  font-size: 13px; font-weight: 500; color: var(--text-3);
  background: var(--bg-2); border-bottom: 1px solid var(--border-2);
  letter-spacing: .02em;
}
.cmp thead th.hl { color: var(--accent); }
.cmp tbody tr + tr th, .cmp tbody tr + tr td { border-top: 1px solid var(--border); }
.cmp tbody th {
  font-weight: 500; color: var(--text); white-space: nowrap;
  background: rgba(11, 15, 23, 0.5);
}
.cmp tbody td { color: var(--text-2); line-height: 1.7; }
.cmp tbody td.hl {
  color: var(--text); background: rgba(0, 212, 170, 0.045);
  border-left: 1px solid rgba(0, 212, 170, 0.16);
}

/* ---------------- 差异化 ---------------- */
.diff-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.diff {
  position: relative; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 30px 28px;
  transition: border-color .2s ease, transform .2s ease;
}
.diff:hover { border-color: rgba(0, 212, 170, 0.32); transform: translateY(-2px); }
.diff-num {
  font-size: 13px; color: var(--accent); letter-spacing: .1em; margin-bottom: 16px;
}
.diff h3 { font-size: 18px; margin-bottom: 12px; }
.diff p { font-size: 14px; color: var(--text-2); line-height: 1.8; }
.diff p b { color: var(--text); font-weight: 500; }

/* ---------------- 流程 ---------------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: step; }
.step {
  position: relative; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px 24px;
  transition: border-color .2s ease;
}
.step:hover { border-color: var(--border-2); }
.step-idx { font-size: 13px; color: var(--accent); letter-spacing: .1em; margin-bottom: 14px; }
.step h3 { font-size: 16.5px; margin-bottom: 10px; }
.step p { font-size: 13.5px; color: var(--text-2); line-height: 1.75; }

/* ---------------- 体检 CTA ---------------- */
.band { padding: 20px 0 96px; }
.band-inner {
  border: 1px solid rgba(0, 212, 170, 0.24); border-radius: 16px;
  background:
    radial-gradient(70% 130% at 12% 0%, rgba(0, 212, 170, 0.13), transparent 62%),
    linear-gradient(180deg, var(--card) 0%, #0f1522 100%);
  padding: 52px 48px;
}
.band-copy { max-width: 620px; }
.band h2 { font-size: 30px; letter-spacing: -0.02em; margin-bottom: 14px; }
.band p { font-size: 15.5px; color: var(--text-2); margin-bottom: 30px; }
.band-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------------- FAQ ---------------- */
.faq { border-top: 1px solid var(--border); }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item summary {
  list-style: none; cursor: pointer; padding: 22px 40px 22px 0; position: relative;
  font-size: 16.5px; font-weight: 500; color: var(--text);
  transition: color .18s ease;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--accent); }
.faq-item summary::after {
  content: ""; position: absolute; right: 8px; top: 50%;
  width: 9px; height: 9px; margin-top: -6px;
  border-right: 1.6px solid var(--text-3); border-bottom: 1.6px solid var(--text-3);
  transform: rotate(45deg); transition: transform .22s ease, border-color .18s ease;
}
.faq-item[open] summary::after { transform: rotate(-135deg); margin-top: -2px; border-color: var(--accent); }
.faq-item[open] summary { color: var(--accent); }
.faq-body { padding: 0 40px 24px 0; }
.faq-body p { font-size: 14.5px; color: var(--text-2); line-height: 1.85; }
.faq-body b { color: var(--text); font-weight: 500; }

/* ---------------- 页脚 ---------------- */
.foot { background: var(--bg-2); border-top: 1px solid var(--border); padding: 64px 0 32px; }
.foot-inner { display: flex; flex-direction: column; gap: 44px; }
.foot-main { display: grid; grid-template-columns: 1.6fr 1fr 1.2fr 1fr; gap: 40px; }
.foot-brand .brand { margin-bottom: 14px; }
.foot-slogan { font-size: 14.5px; color: var(--text-2); margin-bottom: 10px; }
.foot-note { font-size: 13px; color: var(--text-3); line-height: 1.7; }
.foot-col h4 { font-size: 14px; margin-bottom: 16px; color: var(--text); }
.foot-col ul { display: flex; flex-direction: column; gap: 11px; }
.foot-col li { font-size: 13.5px; color: var(--text-2); }
.foot-col a { transition: color .18s ease; }
.foot-col a:hover { color: var(--accent); }

.foot-bottom {
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  padding-top: 26px; border-top: 1px solid var(--border);
  font-size: 13px; color: var(--text-3);
}
.foot-legal { display: flex; align-items: center; gap: 22px; }
.foot-legal a:hover { color: var(--accent); }

/* ---------------- 滚动显现（渐进增强） ----------------
   仅在 JS 可用（html.js）时隐藏待显元素；无 JS 环境内容全量可见，
   保证爬虫 / AI 抓取器 / 禁 JS 用户读到完整页面。 */
.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.js .reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover, .card:hover, .diff:hover { transform: none; }
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
  .hero-inner { grid-template-columns: 1fr; gap: 52px; }
  .hero-demo { max-width: 560px; }
  .hero h1 { font-size: 46px; }
  .cards-6, .steps { grid-template-columns: repeat(2, 1fr); }
  .foot-main { grid-template-columns: 1fr 1fr; gap: 34px; }
}

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: flex; }

  .nav.is-open .nav-links,
  .nav.is-open .nav-cta {
    display: flex; position: absolute; left: 0; right: 0; top: 68px;
    background: var(--bg-2); border-bottom: 1px solid var(--border);
    flex-direction: column; align-items: flex-start; gap: 0;
    padding: 8px 24px 20px;
  }
  .nav.is-open .nav-links a { padding: 12px 0; width: 100%; font-size: 15px; }
  .nav.is-open .nav-cta { top: auto; padding: 0 24px 22px; flex-direction: row; }

  .sec { padding: 72px 0; }
  .hero { padding: 56px 0 72px; }
  .hero h1 { font-size: 38px; }
  .lede { font-size: 16px; }
  .sec-head h2 { font-size: 27px; }
  .cards-3, .cards-6, .diff-grid, .steps { grid-template-columns: 1fr; }
  .hero-facts { grid-template-columns: repeat(2, 1fr); gap: 22px; }
  .band-inner { padding: 38px 26px; }
  .band h2 { font-size: 25px; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 18px; }
  .hero h1 { font-size: 31px; }
  .hero-actions .btn, .band-actions .btn { width: 100%; }
  .demo-metrics { grid-template-columns: 1fr 1fr; }
  .cmp th, .cmp td { padding: 13px 14px; font-size: 13px; }
  .cmp-wrap { overflow-x: auto; }
  .cmp { min-width: 560px; }
  .foot-main { grid-template-columns: 1fr; gap: 28px; }
  .foot-bottom { flex-direction: column; align-items: flex-start; gap: 10px; }
}