:root{--color-bg: #111;--color-surface: #1c1c1c;--color-surface-raised: #252525;--color-border: #2a2a2a;--color-ink: #f2f2f2;--color-ink-muted: #909090;--color-accent: #e8ff47;--color-danger: #ff4f4f;--color-success: #4fcc8a;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-6: 24px;--space-8: 32px;--space-12: 48px;--space-16: 64px;--font-sans: "Inter", system-ui, sans-serif;--font-mono: "JetBrains Mono", "Fira Mono", monospace;--text-xs: 11px;--text-sm: 13px;--text-base: 15px;--text-lg: 18px;--text-xl: 22px;--text-2xl: 28px;--leading-tight: 1.2;--leading-base: 1.5;--radius-none: 0;--radius-sm: 3px;--radius-full: 9999px;--shadow-card: 4px 4px 0 #000;--shadow-card-hover: 2px 2px 0 #000;--shadow-card-active: 0px 0px 0 #000;--ease-out: cubic-bezier(.16, 1, .3, 1);--duration-fast: .1s;--duration-base: .2s}.app-header{display:flex;align-items:center;gap:var(--space-4);padding:var(--space-3) var(--space-6);border-bottom:1px solid 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