/* ============================================================
   Nebula 星云 · 暗黑霓虹 Bento 模板
   与前序白底卡片模板完全不同的视觉语言
   ============================================================ */
:root {
  --bg: #0b0b14;
  --surface: #151524;
  --surface-2: #1d1d33;
  --line: rgba(255, 255, 255, .08);
  --txt: #eceaf6;
  --muted: #9a97b5;
  --violet: #8b5cf6;
  --cyan: #22d3ee;
  --grad: linear-gradient(120deg, var(--violet), var(--cyan));
  --radius: 22px;
  --maxw: 1180px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--txt); line-height: 1.7; overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 760px; }

/* ---------- 背景光斑 ---------- */
.bg-orbs { position: fixed; inset: 0; z-index: -1; filter: blur(80px); opacity: .5; }
.orb { position: absolute; border-radius: 50%; }
.orb-1 { width: 480px; height: 480px; background: #6d28d9; top: -120px; left: -100px; }
.orb-2 { width: 420px; height: 420px; background: #0e7490; top: 40%; right: -140px; }
.orb-3 { width: 380px; height: 380px; background: #4c1d95; bottom: -120px; left: 30%; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-weight: 600; font-size: 15px;
  border: none; cursor: pointer; white-space: nowrap; transition: transform .15s, box-shadow .15s;
}
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 10px 30px rgba(139,92,246,.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(139,92,246,.55); }
.btn-line { background: transparent; color: var(--txt); border: 1px solid var(--line); }
.btn-line:hover { border-color: var(--cyan); color: var(--cyan); }
.btn-lg { padding: 16px 38px; font-size: 17px; }
.btn-ghost { background: rgba(255,255,255,.06); color: var(--txt); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--violet); }

/* ---------- 导航 ---------- */
.nav { position: sticky; top: 0; z-index: 100; backdrop-filter: blur(14px); background: rgba(11,11,20,.7); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.brand-dot { width: 14px; height: 14px; border-radius: 50%; background: var(--grad); box-shadow: 0 0 14px var(--violet); }
.brand-text em { font-style: normal; color: var(--muted); font-weight: 500; margin-left: 6px; }
.nav-links { display: flex; gap: 26px; }
.nav-links a { font-size: 15px; color: var(--muted); transition: color .15s; }
.nav-links a:hover { color: var(--cyan); }
.burger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 8px; }
.burger span { width: 22px; height: 2px; background: var(--txt); border-radius: 2px; }

/* ---------- Bento 通用 ---------- */
.bento { display: grid; gap: 16px; }
.cell {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; position: relative; overflow: hidden;
  transition: transform .25s, border-color .25s, box-shadow .25s;
}
.cell:hover { border-color: rgba(139,92,246,.5); box-shadow: 0 14px 40px rgba(139,92,246,.18); }

/* ---------- Hero ---------- */
.hero { padding: 70px 0 40px; }
.hero-grid { grid-template-columns: 1.6fr 1fr 1fr; grid-auto-rows: 180px; }
.cell-hero { grid-row: span 2; display: flex; flex-direction: column; justify-content: center; }
.eyebrow { color: var(--cyan); font-weight: 700; letter-spacing: 3px; font-size: 12px; margin-bottom: 14px; }
.cell-hero h1 { font-size: 52px; line-height: 1.12; font-weight: 900; letter-spacing: -1px; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { margin-top: 18px; color: var(--muted); font-size: 17px; max-width: 420px; }
.hero-cta { margin-top: 26px; display: flex; gap: 12px; flex-wrap: wrap; }

.cell-glow, .cell-stat { display: flex; flex-direction: column; justify-content: center; align-items: flex-start; gap: 4px; }
.cell-glow b, .cell-stat b { font-size: 40px; font-weight: 900; }
.cell-glow span, .cell-stat span { color: var(--muted); font-size: 14px; }
.mini-icon { font-size: 26px; margin-bottom: 10px; }
.cell-ring { display: flex; align-items: center; justify-content: center; }
.ring { width: 130px; height: 130px; border-radius: 50%; background: conic-gradient(var(--violet), var(--cyan), var(--violet)); display: flex; align-items: center; justify-content: center; }
.ring-inner { width: 106px; height: 106px; border-radius: 50%; background: var(--surface); display: flex; flex-direction: column; align-items: center; justify-content: center; }
.ring-inner b { font-size: 30px; font-weight: 900; }
.ring-inner small { color: var(--muted); }
.cell-quote { display: flex; align-items: center; background: var(--surface-2); }
.cell-quote p { color: var(--muted); font-style: italic; font-size: 15px; }

/* ---------- 跑马灯 ---------- */
.marquee { overflow: hidden; padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin: 20px 0; }
.marquee-track { display: flex; gap: 28px; width: max-content; animation: scroll 22s linear infinite; align-items: center; }
.marquee-track span { color: var(--muted); font-size: 15px; font-weight: 600; white-space: nowrap; }
.marquee-track i { color: var(--violet); font-style: normal; }
@keyframes scroll { to { transform: translateX(-50%); } }

/* ---------- Section ---------- */
.section { padding: 80px 0; }
.sec-title { font-size: 34px; font-weight: 900; margin-bottom: 30px; }
.sec-title em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------- 功能 Bento ---------- */
.feat-grid { grid-template-columns: repeat(3, 1fr); grid-auto-rows: 170px; }
.feat h3 { font-size: 19px; margin-bottom: 8px; }
.feat p { color: var(--muted); font-size: 14.5px; }
.feat.wide { grid-column: span 2; }
.feat.tall { grid-row: span 2; }

/* ---------- 数据 ---------- */
.stats-grid { grid-template-columns: repeat(4, 1fr); }
.stat { text-align: center; padding: 36px 20px; }
.stat b { font-size: 46px; font-weight: 900; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; display: block; }
.stat span { color: var(--muted); font-size: 14px; }

/* ---------- 体验 ---------- */
.show-grid { grid-template-columns: 1.3fr 1fr; }
.mockbar { display: flex; gap: 8px; margin-bottom: 20px; }
.mockbar span { width: 12px; height: 12px; border-radius: 50%; background: var(--line); }
.mockbar span:first-child { background: var(--violet); }
.mockbar span:nth-child(2) { background: var(--cyan); }
.mocklist { display: grid; gap: 12px; }
.mrow { display: flex; align-items: center; gap: 12px; padding: 14px 16px; border-radius: 12px; background: var(--surface-2); }
.mrow.on { border: 1px solid rgba(34,211,238,.4); }
.mrow i { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.mrow.on i { background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }
.mrow b { font-size: 14px; }
.mrow em { margin-left: auto; font-style: normal; font-size: 12px; color: var(--muted); }
.show-cmd { font-family: "SF Mono", Consolas, monospace; background: #0e0e1a; }
.cmd-line { color: var(--txt); margin-bottom: 12px; }
.cmd-out { color: var(--muted); font-size: 14px; margin-bottom: 6px; }
.cmd-out.ok { color: var(--cyan); }
.prompt { color: var(--violet); }

/* ---------- 画廊 ---------- */
.gal-grid { grid-template-columns: repeat(3, 1fr); }
.gal { padding: 10px; }
.gal img { width: 100%; height: 240px; object-fit: cover; border-radius: 14px; }

/* ---------- FAQ ---------- */
.faq { display: grid; gap: 12px; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 0 22px; }
.faq summary { cursor: pointer; list-style: none; font-weight: 600; padding: 18px 0; position: relative; padding-right: 30px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%); color: var(--cyan); font-size: 22px; transition: transform .2s; }
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq p { padding: 0 0 18px; color: var(--muted); }

/* ---------- CTA ---------- */
.cta { text-align: center; }
.cta h2 { font-size: 40px; font-weight: 900; }
.cta h2 em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.cta p { color: var(--muted); margin: 14px 0 28px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); padding: 30px 0; }
.foot-inner { display: flex; justify-content: space-between; color: var(--muted); font-size: 13px; flex-wrap: wrap; gap: 10px; }

/* ---------- 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) {
  .hero-grid { grid-template-columns: 1fr 1fr; grid-auto-rows: 150px; }
  .cell-hero { grid-column: span 2; grid-row: auto; }
  .cell-hero h1 { font-size: 38px; }
  .feat-grid { grid-template-columns: 1fr 1fr; }
  .feat.wide { grid-column: span 2; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .show-grid { grid-template-columns: 1fr; }
  .gal-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-links { position: absolute; top: 66px; left: 0; right: 0; background: rgba(11,11,20,.98); flex-direction: column; gap: 0; max-height: 0; overflow: hidden; transition: max-height .25s; }
  .nav-links.open { max-height: 300px; }
  .nav-links a { padding: 14px 24px; border-top: 1px solid var(--line); }
  .burger { display: flex; }
  .nav .btn-ghost { display: none; }
  .hero-grid, .feat-grid { grid-template-columns: 1fr; }
  .gal-grid { grid-template-columns: 1fr; }
  .feat.wide, .feat.tall { grid-column: auto; grid-row: auto; }
  .cell-hero { grid-column: auto; }
  .section { padding: 56px 0; }
  .sec-title { font-size: 26px; }
}