:root,html[data-theme=dark]{color-scheme:dark;--bg-app: #070708;--bg-elevated: #141416;--bg-card: #121214;--bg-pill: #1a1a1d;--bg-icon: #1c1c20;--bg-glass: rgba(18, 18, 20, .78);--border: rgba(255, 255, 255, .08);--border-strong: rgba(255, 255, 255, .14);--text-primary: rgba(255, 255, 255, .92);--text-secondary: rgba(255, 255, 255, .55);--text-muted: rgba(255, 255, 255, .38);--cta-solid-bg: #f3f3f4;--cta-solid-fg: #111114;--cta-ghost-bg: transparent;--shadow-card: 0 1px 0 rgba(255, 255, 255, .04) inset, 0 18px 40px rgba(0, 0, 0, .28);--glow: radial-gradient(ellipse 70% 50% at 50% 18%, rgba(255, 255, 255, .045), transparent 62%);--theme-dot-a: #f4f4f5;--theme-dot-b: #8a8a90;--theme-dot-c: #3a3a40}html[data-theme=light]{color-scheme:light;--bg-app: #f5f5f4;--bg-elevated: #ffffff;--bg-card: #ffffff;--bg-pill: #ececec;--bg-icon: #f0f0ee;--bg-glass: rgba(255, 255, 255, .86);--border: rgba(0, 0, 0, .08);--border-strong: rgba(0, 0, 0, .14);--text-primary: rgba(20, 20, 20, .92);--text-secondary: rgba(20, 20, 20, .55);--text-muted: rgba(20, 20, 20, .38);--cta-solid-bg: #141416;--cta-solid-fg: #f7f7f6;--cta-ghost-bg: transparent;--shadow-card: 0 1px 0 rgba(255, 255, 255, .8) inset, 0 16px 36px rgba(20, 20, 20, .06);--glow: radial-gradient(ellipse 70% 50% at 50% 18%, rgba(0, 0, 0, .035), transparent 62%);--theme-dot-a: #1a1a1d;--theme-dot-b: #8a8a90;--theme-dot-c: #d6d6d4}:root{--radius-card: 24px;--radius-window: 18px;--radius-pill: 9999px;--radius-icon: 14px;--max: 1120px;--header-h: 72px;--font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;--ease: .18s ease}@media(prefers-reduced-motion:reduce){:root{--ease: 1ms 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var(--border);border-radius:var(--radius-pill);background:var(--bg-pill);color:var(--text-primary);font-size:14px;font-weight:500;letter-spacing:.01em}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:var(--radius-pill);border:1px solid transparent;font-size:15px;font-weight:560;letter-spacing:.01em;transition:transform var(--ease),background-color var(--ease),border-color var(--ease)}.btn-solid{background:var(--cta-solid-bg);color:var(--cta-solid-fg)}.btn-ghost{background:var(--cta-ghost-bg);color:var(--text-primary);border-color:var(--border-strong)}.btn-sm{min-height:38px;padding:0 16px;font-size:13px}.btn:hover{transform:translateY(-1px)}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn:hover{transform:none}}.site-header{position:sticky;top:0;z-index:40;padding-top:env(safe-area-inset-top);background:color-mix(in srgb,var(--bg-app) 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