:root {
            --body-color: #ffffff;
            --body-color-soft: #f5f6f8;
            --body-color-deep: #ebedf2;
            --text-color: #0e1117;
            --text-color-secondary: #555d6e;
            --text-color-muted: #8b93a1;
            --accent-color: #4a9eff;
            --accent-soft: #6db3ff;
            --accent-light: rgba(74, 158, 255, 0.08);
            --accent-glow: rgba(74, 158, 255, 0.3);
            --border-color: rgba(14, 17, 23, 0.08);
            --chat-user-bg: #e4eefb;
            --chat-ai-bg: var(--body-color-soft);
            --red: #e03e3e;
            --green: #1aab55;
            --amber: #d69e2e;
            --gradient-hero: linear-gradient(160deg, var(--body-color) 0%, #eef4fc 100%);
            --gradient-section: linear-gradient(180deg, var(--body-color-soft) 0%, var(--body-color) 100%);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.08);
            --shadow-glow: 0 0 60px rgba(74, 158, 255, 0.12);

            --font-primary: 'TASA Orbiter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --font-mono: 'IBM Plex Mono', 'SF Mono', monospace;

            --headline-xl: clamp(2.75rem, 5.5vw, 4.25rem);
            --headline-lg: clamp(2rem, 4vw, 2.75rem);
            --headline-md: clamp(1.5rem, 3vw, 2rem);
            --headline-sm: 1.25rem;
            --body-lg: 1.125rem;
            --body-md: 1rem;
            --body-sm: 0.875rem;
            --caption: 0.75rem;

            --space-xs: 0.5rem;
            --space-sm: 1rem;
            --space-md: 2rem;
            --space-lg: 3rem;
            --space-xl: 4rem;
            --space-2xl: 6rem;
            --space-3xl: 8rem;

            --container-max: 1200px;
            --container-padding: clamp(1.25rem, 5vw, 2.5rem);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --radius: 16px;
            --radius-sm: 10px;
        }

        [data-theme="dark"] {
            --body-color: #0b0d11;
            --body-color-soft: #12151a;
            --body-color-deep: #0e1015;
            --text-color: #eef0f4;
            --text-color-secondary: #949bab;
            --text-color-muted: #5c6370;
            --accent-color: #4e8af7;
            --accent-soft: #6da0ff;
            --accent-light: rgba(78, 138, 247, 0.08);
            --accent-glow: rgba(78, 138, 247, 0.2);
            --border-color: rgba(255, 255, 255, 0.06);
            --chat-user-bg: rgba(78, 138, 247, 0.12);
            --chat-ai-bg: #16191e;
            --gradient-hero: linear-gradient(160deg, #0b0d11 0%, #0f1520 100%);
            --gradient-section: linear-gradient(180deg, var(--body-color-soft) 0%, var(--body-color) 100%);
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.2);
            --shadow-md: 0 4px 24px rgba(0,0,0,0.3);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.5);
            --shadow-glow: 0 0 80px rgba(78, 138, 247, 0.08);
        }