:root{color-scheme:light;--bg: #ffffff;--bg-soft: #f6f7f9;--bg-elevated: #ffffff;--fg: #1b1f24;--fg-muted: #5b6570;--accent: #1f5fd0;--accent-hover: #1a4fb0;--accent-soft: #e8f0fe;--accent-contrast: #ffffff;--border: #e3e6ea;--border-strong: #cfd4da;--code-bg: #f3f4f6;--code-fg: #1b1f24;--code-prompt: #6a737d;--code-output: #57606a;--shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 8px 24px rgba(16, 24, 40, 0.06);--shadow-lg: 0 2px 4px rgba(16, 24, 40, 0.05), 0 12px 32px rgba(16, 24, 40, 0.09);--glow: rgba(31, 95, 208, 0.09);--hairline: linear-gradient( 90deg, transparent, var(--border) 20%, var(--border) 80%, transparent );--radius: 14px;--radius-sm: 8px;--radius-lg: 20px;--maxw: 46rem;--font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;--step-0: clamp(1rem, 0.97rem + 0.15vw, 1.0625rem);--step-1: clamp(1.2rem, 1.14rem + 0.3vw, 1.35rem);--step-2: clamp(1.45rem, 1.34rem + 0.55vw, 1.75rem);--step-3: clamp(1.75rem, 1.55rem + 1vw, 2.25rem);--step-4: clamp(2.1rem, 1.75rem + 1.6vw, 3.1rem);--header-height: 3.75rem;--ease: cubic-bezier(0.4, 0, 0.2, 1)}@media(prefers-color-scheme: dark){:root:not([data-theme=light]){color-scheme:dark;--bg: #0f1216;--bg-soft: #161a20;--bg-elevated: #1a1f26;--fg: #e6e9ee;--fg-muted: #9aa4b2;--accent: #74a9ff;--accent-hover: #93bdff;--accent-soft: #17263c;--accent-contrast: #0b1220;--border: #262c35;--border-strong: #38414d;--code-bg: #171c22;--code-fg: #e6edf3;--code-prompt: #8b949e;--code-output: #8b949e;--shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);--shadow-lg: 0 2px 6px rgba(0, 0, 0, 0.45), 0 16px 40px rgba(0, 0, 0, 0.4);--glow: rgba(116, 169, 255, 0.12);--hairline: linear-gradient( 90deg, transparent, var(--border) 20%, var(--border) 80%, transparent )}}:root[data-theme=dark]{color-scheme:dark;--bg: #0f1216;--bg-soft: #161a20;--bg-elevated: #1a1f26;--fg: 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