:root {
  --bg: #070b18;
  --bg2: #0b1122;
  --card: rgba(19, 26, 46, .72);
  --card-solid: #131a2e;
  --line: #232c47;
  --line2: #2e3a5e;
  --fg: #eef1fa;
  --muted: #9aa5c0;
  --accent: #4f8cff;
  --accent2: #22d3a5;
  --grad: linear-gradient(135deg, #4f8cff 0%, #22d3a5 100%);
  --shadow: 0 10px 40px rgba(0,0,0,.35);
  --radius: 16px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.65;
  background-image:
    radial-gradient(900px 420px at 80% -10%, rgba(79,140,255,.14), transparent 60%),
    radial-gradient(700px 380px at 0% 10%, rgba(34,211,165,.08), transparent 55%);
  background-attachment: fixed;
}
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 22px; }

/* Nav */
.nav { border-bottom: 1px solid var(--line); background: rgba(7,11,24,.8); backdrop-filter: blur(14px); position: sticky; top: 0; z-index: 50; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.logo { font-weight: 800; font-size: 21px; color: var(--fg); text-decoration: none; letter-spacing: -.3px; }
.logo span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav nav { display: flex; align-items: center; gap: 4px; }
.nav nav a { color: var(--muted); text-decoration: none; margin-left: 6px; padding: 7px 13px; border-radius: 9px; font-size: 14.5px; transition: all .18s; }
.nav nav a:hover { color: var(--fg); background: rgba(79,140,255,.12); }
.lang-btn { background: transparent; border: 1px solid var(--line2); color: var(--fg); border-radius: 9px; padding: 6px 12px; cursor: pointer; font-size: 13px; margin-left: 10px; transition: all .18s; }
.lang-btn:hover { border-color: var(--accent); color: var(--accent); }

/* Hero */
.hero { padding: 104px 0 70px; text-align: center; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(79,140,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(79,140,255,.05) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(600px 300px at 50% 0%, #000 30%, transparent 75%);
}
.badge {
  display: inline-block; font-size: 13px; font-weight: 600; color: var(--accent2);
  border: 1px solid rgba(34,211,165,.35); background: rgba(34,211,165,.08);
  padding: 5px 14px; border-radius: 999px; margin-bottom: 22px;
  animation: fadeUp .6s ease both;
}
.hero h1 {
  font-size: clamp(34px, 5.4vw, 58px); line-height: 1.12; letter-spacing: -.8px;
  background: linear-gradient(180deg, #fff 20%, #b8c4e8 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: fadeUp .6s .05s ease both;
}
.lead { color: var(--muted); font-size: 18px; max-width: 760px; margin: 20px auto 30px; animation: fadeUp .6s .1s ease both; }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; animation: fadeUp .6s .15s ease both; }
.btn {
  display: inline-block; background: var(--grad); color: #fff; padding: 13px 30px;
  border-radius: 12px; text-decoration: none; font-weight: 700; font-size: 15px;
  box-shadow: 0 8px 26px rgba(79,140,255,.35); transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(79,140,255,.5); }
.btn.ghost { background: transparent; border: 1px solid var(--line2); color: var(--fg); box-shadow: none; }
.btn.ghost:hover { border-color: var(--accent); }

/* Stats */
.stats { display: flex; justify-content: center; gap: 18px; margin-top: 46px; flex-wrap: wrap; animation: fadeUp .6s .2s ease both; }
.stat {
  min-width: 150px; padding: 18px 26px; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--line); backdrop-filter: blur(8px);
}
.stat-v { display: block; font-size: 28px; font-weight: 800; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat-l { display: block; font-size: 13px; color: var(--muted); margin-top: 2px; }

/* Sections */
section.wrap { padding: 56px 22px; }
section.wrap h2 {
  font-size: 27px; letter-spacing: -.4px; margin-bottom: 26px;
  display: flex; align-items: center; gap: 12px;
}
section.wrap h2::after { content: ""; flex: 1; height: 1px; background: linear-gradient(90deg, var(--line2), transparent); }

/* Cards */
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; backdrop-filter: blur(8px); transition: transform .18s, border-color .18s, box-shadow .18s;
}
.card:hover { transform: translateY(-4px); border-color: rgba(79,140,255,.45); box-shadow: var(--shadow); }
.card h3 { font-size: 17px; margin-bottom: 9px; }
.card p { color: var(--muted); font-size: 14.5px; }
.card.tier { display: flex; flex-direction: column; gap: 12px; position: relative; }
.card.tier ul { padding-left: 18px; color: var(--muted); font-size: 14.5px; }
.card.tier ul li { margin-bottom: 4px; }
.card.tier .btn { text-align: center; margin-top: auto; }
.card.hot { border-color: rgba(79,140,255,.6); box-shadow: 0 0 34px rgba(79,140,255,.16); }
.price { font-size: 38px; font-weight: 800; letter-spacing: -.5px; }
.price span { font-size: 15px; color: var(--muted); font-weight: 400; }
.qr { display: block; max-width: 200px; margin: 14px auto 0; border-radius: 12px; border: 1px solid var(--line); background: #fff; }

/* Table */
.tbl { width: 100%; border-collapse: separate; border-spacing: 0; margin: 14px 0 24px; overflow: hidden; border-radius: 12px; border: 1px solid var(--line); }
.tbl th, .tbl td { padding: 12px 16px; text-align: left; font-size: 14.5px; border-bottom: 1px solid var(--line); }
.tbl th { background: rgba(79,140,255,.1); font-weight: 700; color: #cdd8f5; }
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl tbody tr { transition: background .15s; }
.tbl tbody tr:hover { background: rgba(79,140,255,.07); }
.tbl code { background: rgba(255,255,255,.08); padding: 1px 6px; border-radius: 6px; font-size: 12.5px; }
.note { color: var(--muted); font-size: 13.5px; }

/* FAQ */
details { background: var(--card); border: 1px solid var(--line); border-radius: 13px; padding: 15px 20px; margin-bottom: 11px; transition: border-color .18s; }
details:hover { border-color: rgba(79,140,255,.4); }
details summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 10px; }
details summary::before { content: "+"; color: var(--accent2); font-weight: 700; font-size: 18px; line-height: 1; }
details[open] summary::before { content: "−"; }
details p { color: var(--muted); margin-top: 9px; font-size: 14.5px; padding-left: 26px; }

/* Code & legal */
pre { background: #0a0f1f; border: 1px solid var(--line); border-radius: 12px; padding: 18px; overflow-x: auto; font-size: 13.5px; }
code { font-family: "SF Mono", Menlo, Consolas, monospace; }
.legal h1 { margin-bottom: 6px; }
.legal h2 { font-size: 19px; margin-top: 26px; }
.legal p, .legal li { color: var(--muted); font-size: 15px; }
.legal ul { padding-left: 22px; }

/* Footer */
.foot { border-top: 1px solid var(--line); padding: 30px 0; margin-top: 50px; text-align: center; color: var(--muted); font-size: 13.5px; }
.foot a { color: var(--muted); text-decoration: none; }
.foot a:hover { color: var(--accent); }

/* Animations */
@keyframes fadeUp { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@media (max-width: 640px) {
  .hero { padding: 64px 0 44px; }
  .nav-inner { height: 56px; }
  .nav nav a { padding: 6px 8px; font-size: 13.5px; }
  .stat { min-width: 120px; padding: 14px 18px; }
}