/* Starsea — 深海蓝单一主题(刻意不做浅色版,与演示视频同一视觉) */
:root {
  --bg: #060b1c; --bg2: #0a1330; --surface: #0f1b3d; --surface2: #14244d;
  --line: rgba(130, 160, 255, .17); --text: #e8eeff; --muted: #9aaad4;
  --accent: #5b8cff; --accent2: #8d6bff; --amber: #ffb454; --ok: #4fd1a5; --bad: #ff7a8a;
  --r: 14px; --max: 1080px;
  --sans: -apple-system, "Segoe UI", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { background: var(--bg); color-scheme: dark; scroll-behavior: smooth; }
html[lang="zh"] [data-l="en"], html[lang="en"] [data-l="zh"] { display: none !important; }
body { margin: 0; background: radial-gradient(1200px 600px at 78% -8%, rgba(91, 140, 255, .18), transparent 60%), radial-gradient(900px 500px at 5% 12%, rgba(141, 107, 255, .12), transparent 55%), var(--bg);
  color: var(--text); font: 16px/1.65 var(--sans); padding-inline: 16px; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: #8fb0ff; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 6px; }
.wrap { max-width: var(--max); margin-inline: auto; }
h1, h2, h3 { line-height: 1.25; text-wrap: balance; margin: 0 0 .5em; letter-spacing: .01em; }
h1 { font-size: clamp(1.9rem, 5vw, 3rem); font-weight: 750; }
h2 { font-size: clamp(1.35rem, 3vw, 1.85rem); font-weight: 700; }
h3 { font-size: 1.05rem; font-weight: 650; }
p { margin: 0 0 1em; max-width: 68ch; }
.muted { color: var(--muted); }
.eyebrow { font: 600 .72rem/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-bottom: 14px; }

/* 顶栏 */
.nav { display: flex; align-items: center; gap: 14px; padding: 16px 0; flex-wrap: wrap; }
.brand { font-weight: 800; letter-spacing: .04em; color: var(--text); text-decoration: none; display: inline-flex; align-items: center; gap: 9px; }
.brand i { width: 22px; height: 22px; border-radius: 7px; background: linear-gradient(135deg, var(--accent), var(--accent2)); display: inline-block; box-shadow: 0 0 18px rgba(91, 140, 255, .55); }
.nav .sp { flex: 1; }
.nav a.l { color: var(--muted); text-decoration: none; font-size: .92rem; }
.nav a.l:hover, .nav a.l[aria-current] { color: var(--text); }
.lang { border: 1px solid var(--line); background: transparent; color: var(--muted); border-radius: 999px; padding: 4px 12px; font: inherit; font-size: .82rem; cursor: pointer; }
.lang:hover { color: var(--text); border-color: var(--accent); }

/* 按钮 */
.btn { display: inline-flex; align-items: center; gap: 8px; border: 0; border-radius: 12px; padding: 12px 20px; font: 650 .98rem var(--sans); cursor: pointer; text-decoration: none; transition: transform .12s, box-shadow .12s; }
.btn:active { transform: translateY(1px); }
.btn.pri { background: linear-gradient(135deg, var(--amber), #ff8f5a); color: #1a1205; box-shadow: 0 8px 26px rgba(255, 160, 80, .28); }
.btn.pri:hover { box-shadow: 0 10px 32px rgba(255, 160, 80, .42); color: #1a1205; }
.btn.sec { background: transparent; color: var(--text); border: 1px solid var(--line); }
.btn.sec:hover { border-color: var(--accent); color: var(--text); }
.btn[disabled] { opacity: .55; cursor: wait; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

/* 首屏 */
.hero { padding: clamp(28px, 7vw, 76px) 0 28px; }
.hero p.lead { font-size: 1.12rem; color: #c3cff0; max-width: 60ch; }
.facts { display: flex; gap: 10px 22px; flex-wrap: wrap; margin-top: 26px; padding: 0; list-style: none; font: .82rem var(--mono); color: var(--muted); }
.facts li { white-space: nowrap; }
.facts b { color: var(--text); font-weight: 650; }
section { padding: clamp(26px, 5vw, 52px) 0; border-top: 1px solid var(--line); }
section.first { border-top: 0; }

/* 视频 */
.video { border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; background: #000; max-width: 880px; box-shadow: 0 24px 70px rgba(0, 0, 0, .45); }
.video video { display: block; width: 100%; height: auto; aspect-ratio: 16/9; background: #000; }
.cap { font-size: .84rem; color: var(--muted); margin: 10px 2px 0; }

/* 卡片网格 */
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card { background: linear-gradient(180deg, var(--surface), #0c1636); border: 1px solid var(--line); border-radius: var(--r); padding: 20px; }
.card h3 { margin-bottom: 6px; }
.card p { color: #b6c3e8; font-size: .94rem; margin: 0; }
.card .tag { font: .72rem var(--mono); color: var(--accent); margin-bottom: 10px; display: block; letter-spacing: .08em; }
ul.mods { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
ul.mods li { padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: rgba(15, 27, 61, .55); font-size: .94rem; color: #c3cff0; }
ul.mods b { color: var(--text); display: block; margin-bottom: 2px; }
.two { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.yes li::marker { color: var(--ok); } .no li::marker { color: var(--bad); }
.two ul { padding-left: 1.2em; margin: 8px 0 0; color: #c3cff0; }
.two li { margin-bottom: 6px; }

/* 购买 */
.buy { display: grid; gap: 22px; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); align-items: start; }
@media (max-width: 760px) { .buy { grid-template-columns: minmax(0, 1fr); } }
.price { font-size: 2.6rem; font-weight: 800; letter-spacing: -.02em; }
.price s { font-size: 1.1rem; color: var(--muted); font-weight: 500; margin-left: 8px; }
.price small { font-size: .9rem; color: var(--muted); font-weight: 500; margin-left: 6px; }
form .f { display: grid; gap: 6px; margin-bottom: 14px; }
label { font-size: .86rem; color: var(--muted); }
input, select, textarea { width: 100%; background: #0a1230; color: var(--text); border: 1px solid var(--line); border-radius: 10px; padding: 11px 12px; font: inherit; font-size: .96rem; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }
textarea { min-height: 110px; resize: vertical; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.note { font-size: .82rem; color: var(--muted); }
.ok { color: var(--ok); } .err { color: var(--bad); }
.pay { display: flex; gap: 8px; flex-wrap: wrap; margin: 6px 0 0; padding: 0; list-style: none; }
.pay li { border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: .82rem; color: #c3cff0; }

/* 流程(真实顺序,所以带编号) */
ol.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
ol.steps li { counter-increment: s; border: 1px solid var(--line); border-radius: var(--r); padding: 18px; background: rgba(15, 27, 61, .55); }
ol.steps li::before { content: counter(s); display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; background: linear-gradient(135deg, var(--accent), var(--accent2)); font: 700 .82rem var(--mono); margin-bottom: 10px; }
.from { font: 700 1.5rem var(--sans); color: var(--text); }
.from small { font-size: .8rem; color: var(--muted); font-weight: 500; }

/* FAQ */
details { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 10px; background: rgba(15, 27, 61, .45); }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 10px 0 0; color: #b6c3e8; }

footer { padding: 36px 0 60px; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; }
footer .row { justify-content: space-between; }

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn { transition: none; } }

.pill { font: .66rem var(--mono); color: var(--accent); border: 1px solid var(--line); border-radius: 999px; padding: 1px 8px; margin-left: 8px; vertical-align: middle; letter-spacing: .04em; }
ul.mods li b a { color: var(--text); }

.vlinks { margin-bottom: 8px; }
html[lang="zh"] .v-bili { order: -1; }
@media (max-width: 520px) { .vlinks .btn { width: 100%; justify-content: center; text-align: center; } }