*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-size:16px}body{color:var(--text-primary);background:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif;line-height:1.6;overflow-x:hidden}#root{flex-direction:column;min-height:100vh;display:flex}img{max-width:100%;height:auto;display:block}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:inherit;font-size:inherit;background:0 0;border:none}ul,ol{list-style:none}.skip-link{z-index:9999;background:var(--accent);color:#fff;border-radius:0 0 8px 8px;padding:8px 16px;font-size:14px;font-weight:600;transition:top .2s;position:absolute;top:-100%;left:16px}.skip-link:focus{top:0}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}.section{padding:80px 0}.section-header{text-align:center;margin-bottom:48px}.section-title{color:var(--text-primary);letter-spacing:-.02em;margin-bottom:12px;font-size:2rem;font-weight:800}.section-subtitle{color:var(--text-secondary);max-width:520px;margin:0 auto;font-size:1.05rem}.btn{border:2px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:12px 28px;font-size:.95rem;font-weight:600;transition:all .25s;display:inline-flex}.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover);box-shadow:0 8px 24px var(--accent-glow);transform:translateY(-2px)}.btn-primary:active{transform:translateY(0)}.btn-outline{color:var(--text-primary);border-color:var(--border-color);background:0 0}.btn-outline:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-subtle)}.btn-sm{border-radius:8px;padding:8px 20px;font-size:.875rem}.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none!important;transform:none!important}.btn-loading{align-items:center;gap:8px;display:inline-flex}.spinner{border:2px solid #ffffff4d;border-top-color:#fff;border-radius:50%;width:16px;height:16px;animation:.6s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}:root,[data-theme=light]{--bg-primary:#fafafa;--bg-secondary:#fff;--bg-tertiary:#f5f5f5;--bg-card:#fff;--text-primary:#1a1a2e;--text-secondary:#6b7280;--text-tertiary:#9ca3af;--border-color:#e5e7eb;--border-light:#f0f0f0;--accent:#6366f1;--accent-hover:#4f46e5;--accent-subtle:#6366f114;--accent-glow:#6366f14d;--shadow-sm:0 1px 3px #0000000f;--shadow-md:0 4px 16px #00000014;--shadow-lg:0 12px 40px #0000001a;--shadow-xl:0 20px 60px #0000001f;--glass-bg:#ffffffb3;--glass-border:#00000014;--gradient-start:#6366f1;--gradient-end:#8b5cf6;--navbar-bg:#fafafacc;--code-bg:#f3f4f6;--code-text:#1f2937;--skeleton-base:#e5e7eb;--skeleton-shine:#f3f4f6;--error-color:#ef4444;--error-bg:#ef444414;--success-color:#22c55e;--success-bg:#22c55e14;--card-hover-shadow:0 20px 50px #6366f126}[data-theme=dark]{--bg-primary:#0a0a0f;--bg-secondary:#12121a;--bg-tertiary:#1a1a26;--bg-card:#16161f;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-tertiary:#64748b;--border-color:#1e293b;--border-light:#1a2332;--accent:#818cf8;--accent-hover:#6366f1;--accent-subtle:#818cf81a;--accent-glow:#818cf840;--shadow-sm:0 1px 3px #0003;--shadow-md:0 4px 16px #0000004d;--shadow-lg:0 12px 40px #0006;--shadow-xl:0 20px 60px 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