:root { color-scheme: light; font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; color: var(--ink); background: var(--canvas); }
body::before { content: ""; position: fixed; inset: 0; pointer-events: none; background: radial-gradient(circle at 82% 14%, var(--glow), transparent 32rem), linear-gradient(135deg, transparent 58%, var(--wash)); }
.shell { width: min(1120px, calc(100% - 40px)); min-height: 100vh; margin: 0 auto; display: grid; grid-template-rows: auto 1fr auto; position: relative; }
.topbar { min-height: 82px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 850; letter-spacing: -.03em; }
.brand-mark { width: 34px; height: 34px; border-radius: 11px; background: var(--accent); box-shadow: 0 10px 28px var(--shadow); position: relative; }
.brand-mark::after { content: ""; position: absolute; inset: 9px; border: 2px solid white; border-radius: 50%; }
.domain { color: var(--muted); font: 700 12px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .04em; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 410px); gap: clamp(36px, 8vw, 104px); align-items: center; padding: 72px 0; }
.eyebrow { margin: 0 0 20px; color: var(--accent); font: 800 12px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .14em; text-transform: uppercase; }
h1 { max-width: 720px; margin: 0; font-size: clamp(48px, 8vw, 92px); line-height: .98; letter-spacing: -.075em; }
.lead { max-width: 630px; margin: 28px 0 0; color: var(--muted); font-size: clamp(16px, 2vw, 20px); line-height: 1.8; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 38px; }
.button { min-height: 48px; padding: 0 22px; border: 1px solid var(--line); border-radius: 14px; display: inline-flex; align-items: center; justify-content: center; color: var(--ink); background: var(--surface); text-decoration: none; font-weight: 750; transition: transform .18s ease, box-shadow .18s ease; }
.button.primary { color: white; background: var(--accent); border-color: var(--accent); box-shadow: 0 14px 36px var(--shadow); }
.button:hover { transform: translateY(-2px); }
.signal { min-height: 420px; padding: 32px; border: 1px solid var(--line); border-radius: 32px; background: var(--surface); box-shadow: 0 28px 80px var(--card-shadow); display: grid; align-content: space-between; overflow: hidden; position: relative; }
.signal::after { content: ""; width: 250px; height: 250px; position: absolute; right: -90px; bottom: -90px; border: 42px solid var(--ring); border-radius: 50%; }
.signal-label { color: var(--muted); font: 750 12px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .1em; }
.signal strong { max-width: 270px; font-size: 34px; line-height: 1.18; letter-spacing: -.05em; position: relative; z-index: 1; }
.signal-meta { display: grid; gap: 10px; position: relative; z-index: 1; }
.signal-meta span { color: var(--muted); font-size: 13px; }
footer { min-height: 74px; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 12px; }
footer nav { display: flex; gap: 18px; }
footer a { color: inherit; text-decoration: none; }
body.txdy { --canvas:#07142f; --surface:#0d2045; --wash:rgba(38,120,255,.13); --glow:rgba(65,210,255,.18); --ink:#f4f8ff; --muted:#9caecc; --line:rgba(157,188,235,.18); --accent:#287cf2; --shadow:rgba(40,124,242,.34); --card-shadow:rgba(0,0,0,.34); --ring:rgba(83,211,255,.17); }
body.yxsh { --canvas:#f4f8ff; --surface:#ffffff; --wash:rgba(42,137,240,.08); --glow:rgba(92,197,255,.17); --ink:#19314f; --muted:#6d7f96; --line:#dbe6f4; --accent:#1769e0; --shadow:rgba(23,105,224,.22); --card-shadow:rgba(39,79,126,.12); --ring:#e4f2ff; }
@media (max-width: 760px) { .shell { width: min(100% - 28px, 620px); } .topbar { min-height: 68px; } .domain { display: none; } .hero { grid-template-columns: 1fr; padding: 54px 0; } h1 { font-size: clamp(46px, 16vw, 72px); } .signal { min-height: 300px; } footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 10px; } }
@media (prefers-reduced-motion: reduce) { .button { transition: none; } }