/* ============================================================
   landing.css — 门户页（深色科技风，独立于后台浅色体系）
   ============================================================ */

:root {
  --brand-1: #6366f1;
  --brand-2: #8b5cf6;
  --brand-grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --bg-deep: #0a0f1e;
  --bg-2: #0f172a;
  --card: rgba(255, 255, 255, .045);
  --card-border: rgba(255, 255, 255, .09);
  --txt: #e2e8f0;
  --txt-2: #94a3b8;
  --txt-3: #64748b;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--txt);
  background: var(--bg-deep);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ── 顶栏 ─────────────────────────────────────────────────── */

.l-nav {
  position: sticky; top: 0; z-index: 60;
  background: rgba(10, 15, 30, .75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, .06);
}
.l-nav-inner {
  max-width: 1100px; margin: 0 auto; padding: 0 24px;
  height: 62px; display: flex; align-items: center; gap: 28px;
}
.l-logo {
  display: flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 17px; letter-spacing: .3px;
}
.l-logo .logo {
  width: 30px; height: 30px; border-radius: 9px;
  background: var(--brand-grad);
  display: grid; place-items: center; color: #fff; font-size: 15px;
  box-shadow: 0 4px 16px rgba(99, 102, 241, .45);
}
.l-nav-links { display: flex; gap: 24px; margin-left: 12px; }
.l-nav-links a { color: var(--txt-2); font-size: 14px; font-weight: 500; transition: color .2s; }
.l-nav-links a:hover { color: #fff; }
.l-nav-spacer { flex: 1; }
.l-nav-actions { display: flex; gap: 10px; }

.l-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 18px; border-radius: 10px; font-size: 14px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: all .2s; white-space: nowrap;
}
.l-btn-primary { background: var(--brand-grad); color: #fff; box-shadow: 0 4px 18px rgba(99, 102, 241, .4); }
.l-btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 26px rgba(99, 102, 241, .55); }
.l-btn-ghost { color: var(--txt); border-color: rgba(255, 255, 255, .16); background: rgba(255,255,255,.03); }
.l-btn-ghost:hover { border-color: var(--brand-1); color: #fff; }
.l-btn-lg { padding: 13px 26px; font-size: 15px; border-radius: 12px; }

/* ── Hero ─────────────────────────────────────────────────── */

.hero {
  position: relative; overflow: hidden;
  text-align: center; padding: 110px 24px 90px;
  background:
    radial-gradient(900px 460px at 15% -10%, rgba(99, 102, 241, .28), transparent 60%),
    radial-gradient(800px 420px at 90% 0%, rgba(139, 92, 246, .22), transparent 55%),
    radial-gradient(700px 380px at 50% 110%, rgba(59, 130, 246, .12), transparent 60%);
}
.hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 30%, transparent 75%);
}
.hero > * { position: relative; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 16px; border-radius: 999px; font-size: 13px;
  color: #c7d2fe; background: rgba(99, 102, 241, .12);
  border: 1px solid rgba(99, 102, 241, .35);
}
.hero h1 {
  font-size: clamp(30px, 6vw, 56px); font-weight: 800; line-height: 1.15;
  margin: 22px auto 18px; max-width: 760px; letter-spacing: -.5px;
}
.hero h1 .grad {
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p {
  color: var(--txt-2); font-size: 17px; max-width: 600px;
  margin: 0 auto 34px;
}
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  display: flex; justify-content: center; gap: 46px; flex-wrap: wrap;
  margin-top: 60px; padding-top: 34px;
  border-top: 1px solid rgba(255, 255, 255, .07);
}
.h-stat .n { font-size: 26px; font-weight: 800; font-family: var(--mono); }
.h-stat .l { font-size: 12.5px; color: var(--txt-3); margin-top: 2px; }

/* ── 区块通用 ──────────────────────────────────────────────── */

.section { max-width: 1100px; margin: 0 auto; padding: 84px 24px; }
.section-head { text-align: center; margin-bottom: 44px; }
.section-head .tag {
  display: inline-block; font-size: 12.5px; font-weight: 700; letter-spacing: 1.5px;
  color: #a5b4fc; text-transform: uppercase; margin-bottom: 10px;
}
.section-head h2 { font-size: clamp(24px, 4vw, 34px); font-weight: 800; letter-spacing: -.3px; }
.section-head p { color: var(--txt-2); margin-top: 10px; font-size: 15px; }

/* ── 特性卡片 ─────────────────────────────────────────────── */

.feat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
}
.feat {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 16px; padding: 26px 24px;
  transition: all .25s ease;
}
.feat:hover { transform: translateY(-4px); border-color: rgba(99, 102, 241, .5); background: rgba(99, 102, 241, .06); }
.feat .ico {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--brand-grad); display: grid; place-items: center;
  color: #fff; margin-bottom: 16px; box-shadow: 0 6px 18px rgba(99, 102, 241, .35);
}
.feat h3 { font-size: 16.5px; margin-bottom: 8px; }
.feat p { color: var(--txt-2); font-size: 13.5px; }

/* ── 流程 ─────────────────────────────────────────────────── */

.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; counter-reset: step; }
.step {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 16px; padding: 26px 22px; position: relative;
}
.step::before {
  counter-increment: step; content: counter(step, decimal-leading-zero);
  font-family: var(--mono); font-size: 22px; font-weight: 800;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.step h4 { margin: 10px 0 6px; font-size: 15.5px; }
.step p { color: var(--txt-2); font-size: 13.5px; }

/* ── 指标条（性能） ───────────────────────────────────────── */

.metrics {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.metric {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: 16px; padding: 26px 22px; text-align: center;
}
.metric .n {
  font-size: 30px; font-weight: 800; font-family: var(--mono);
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.metric .l { color: var(--txt-3); font-size: 13px; margin-top: 4px; }

/* ── CTA ──────────────────────────────────────────────────── */

.cta-band {
  max-width: 1100px; margin: 0 auto 80px; padding: 0 24px;
}
.cta-box {
  border-radius: 22px; padding: 58px 30px; text-align: center;
  background:
    radial-gradient(600px 260px at 50% -30%, rgba(99, 102, 241, .35), transparent 70%),
    rgba(255, 255, 255, .04);
  border: 1px solid var(--card-border);
}
.cta-box h2 { font-size: clamp(22px, 4vw, 32px); font-weight: 800; }
.cta-box p { color: var(--txt-2); margin: 12px auto 26px; max-width: 480px; }

/* ── Footer ───────────────────────────────────────────────── */

.l-footer {
  border-top: 1px solid rgba(255, 255, 255, .07);
  padding: 34px 24px; text-align: center;
  color: var(--txt-3); font-size: 13px;
}

/* ── 响应式 ───────────────────────────────────────────────── */

@media (max-width: 720px) {
  .l-nav-links { display: none; }
  .hero { padding: 76px 18px 64px; }
  .hero-stats { gap: 26px; }
  .section { padding: 60px 18px; }
  .feat-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
}