:root {
  --bg: #080c16;
  --bg2: #0f1628;
  --card: #151e34;
  --line: #26324e;
  --text: #eef1f7;
  --muted: #98a3b8;
  --green: #2edc8c;
  --gold: #ffc428;
  --blue: #5aaaff;
  --red: #f05050;
  --radius: 18px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(1200px 700px at 80% -10%, #16233f 0%, transparent 60%), var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
}
a { color: var(--gold); }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* nav */
header.nav { position: sticky; top: 0; z-index: 10; backdrop-filter: blur(10px); background: rgba(8, 12, 22, .78); border-bottom: 1px solid var(--line); }
header.nav .wrap { display: flex; align-items: center; gap: 18px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
header.nav nav { margin-left: auto; display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
header.nav nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
header.nav nav a:hover { color: var(--text); }
.btn { display: inline-block; padding: 13px 26px; border-radius: 999px; font-weight: 700; text-decoration: none; transition: transform .15s, box-shadow .15s; }
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--green); color: #06140d; box-shadow: 0 10px 30px rgba(46, 220, 140, .25); }
.btn-ghost { border: 1px solid var(--line); color: var(--text); }
header.nav .btn { padding: 8px 18px; font-size: 15px; }

/* hero */
.hero { padding: 72px 0 40px; text-align: center; }
.kicker { color: var(--gold); font-weight: 700; letter-spacing: .12em; text-transform: uppercase; font-size: 14px; }
h1 { font-size: clamp(36px, 6vw, 64px); line-height: 1.08; margin: 14px 0 18px; letter-spacing: -.02em; }
h1 .accent { color: var(--green); }
.lead { color: var(--muted); font-size: clamp(18px, 2.2vw, 21px); max-width: 760px; margin: 0 auto 28px; }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin: 44px 0 12px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; }
.stat b { display: block; font-size: 32px; color: var(--green); letter-spacing: -.01em; }
.stat span { color: var(--muted); font-size: 14px; }
.stat.gold b { color: var(--gold); }
.note { color: var(--muted); font-size: 13px; }

/* sections */
section { padding: 56px 0; }
h2 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 12px; letter-spacing: -.01em; }
.sub { color: var(--muted); max-width: 760px; margin: 0 0 30px; }
.center { text-align: center; }
.center .sub { margin-left: auto; margin-right: auto; }
.frame { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); box-shadow: 0 30px 80px rgba(0, 0, 0, .45); background: #0b111f; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; align-items: center; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3 { margin: 6px 0 8px; font-size: 21px; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.icon { width: 44px; height: 44px; border-radius: 12px; background: rgba(46, 220, 140, .14); color: var(--green); display: grid; place-items: center; font-size: 22px; font-weight: 800; }
.setup .net { font-size: 34px; font-weight: 800; margin: 12px 0 4px; }
.setup .meta { color: var(--muted); font-size: 15px; }
.tag { display: inline-block; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; background: rgba(255, 196, 40, .14); color: var(--gold); }

/* video */
.video { position: relative; aspect-ratio: 16 / 9; cursor: pointer; }
.video img { width: 100%; height: 100%; object-fit: cover; }
.video .play { position: absolute; inset: 0; display: grid; place-items: center; }
.video .play span { width: 96px; height: 96px; border-radius: 50%; background: var(--green); display: grid; place-items: center; box-shadow: 0 10px 40px rgba(46, 220, 140, .45); }
.video .play span::after { content: ""; margin-left: 8px; border-left: 30px solid #06140d; border-top: 18px solid transparent; border-bottom: 18px solid transparent; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* steps, tables, faq */
ol.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
ol.steps li { counter-increment: s; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px 16px 64px; position: relative; }
ol.steps li::before { content: counter(s); position: absolute; left: 18px; top: 14px; width: 32px; height: 32px; border-radius: 50%; background: var(--gold); color: #1a1300; font-weight: 800; display: grid; place-items: center; }
table { width: 100%; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; padding: 11px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--gold); font-weight: 700; }
td code, p code, li code { background: #0b111f; border: 1px solid var(--line); padding: 1px 6px; border-radius: 6px; font-size: 14px; }
.table-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 10px; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; margin-bottom: 12px; }
summary { cursor: pointer; font-weight: 700; }
details p { color: var(--muted); margin: 10px 0 0; }
.risk { border: 1px solid rgba(255, 196, 40, .35); background: rgba(255, 196, 40, .06); border-radius: var(--radius); padding: 20px 22px; color: var(--muted); font-size: 15px; }
.final { text-align: center; background: linear-gradient(135deg, #12213e, #0e1a2f); border: 1px solid var(--line); border-radius: 26px; padding: 48px 24px; }
.price { font-size: 44px; font-weight: 800; margin: 6px 0; }
.price small { font-size: 18px; color: var(--muted); font-weight: 500; }

footer { border-top: 1px solid var(--line); padding: 30px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; gap: 20px; flex-wrap: wrap; justify-content: space-between; }
footer a { color: var(--muted); }

@media (max-width: 860px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid3, .grid2 { grid-template-columns: 1fr; }
  header.nav nav a.hide-sm { display: none; }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .hero { padding-top: 48px; }
  .stat b { font-size: 26px; }
  header.nav nav { gap: 12px; flex-wrap: nowrap; }
  .brand .bn { display: none; }
}