/* ========================================
   Design Tokens (CSS Custom Properties)
   ======================================== */
:root {
    /* --- Colors --- */
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-light: #DBEAFE;
    --primary-50: #EFF6FF;
    --primary-900: #1E3A8A;

    --success: #10B981;
    --success-light: #ECFDF5;
    --warning: #F59E0B;
    --warning-light: #FFFBEB;
    --danger: #EF4444;
    --danger-light: #FEF2F2;

    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-tertiary: #9CA3AF;
    --text-inverse: #FFFFFF;

    --bg-base: #F8FAFC;
    --bg-card: #FFFFFF;
    --bg-hover: #F1F5F9;
    --bg-elevated: #FFFFFF;

    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --border-focus: #2563EB;

    /* --- Typography --- */
    --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --text-display: 58px;
    --text-h1: 42px;
    --text-h2: 34px;
    --text-h3: 26px;
    --text-h4: 21px;
    --text-body-lg: 19px;
    --text-body: 17px;
    --text-small: 15px;
    --text-caption: 13px;
    --text-overline: 11px;

    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    --weight-extrabold: 800;

    --leading-tight: 1.25;
    --leading-snug: 1.4;
    --leading-normal: 1.6;
    --leading-relaxed: 1.8;

    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.05em;

    /* --- Spacing --- */
    --space-2: 2px;
    --space-4: 4px;
    --space-6: 6px;
    --space-8: 8px;
    --space-10: 10px;
    --space-12: 12px;
    --space-16: 16px;
    --space-20: 20px;
    --space-24: 24px;
    --space-32: 32px;
    --space-40: 40px;
    --space-48: 48px;
    --space-56: 56px;
    --space-64: 64px;
    --space-80: 80px;
    --space-96: 96px;
    --space-120: 120px;

    /* --- Layout --- */
    --max-width: 1400px;
    --max-width-narrow: 800px;
    --grid-gap: 24px;
    --header-height: 72px;

    /* --- Border Radius --- */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-3xl: 24px;
    --radius-full: 9999px;

    /* --- Shadow --- */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    --shadow-colored: 0 10px 30px -5px rgba(37, 99, 235, 0.25);
    --shadow-card: 0 0 0 1px rgba(0, 0, 0, 0.03), 0 2px 4px rgba(0, 0, 0, 0.04), 0 12px 24px rgba(0, 0, 0, 0.04);
    --shadow-card-hover: 0 0 0 1px rgba(0, 0, 0, 0.03), 0 4px 8px rgba(0, 0, 0, 0.06), 0 24px 48px rgba(0, 0, 0, 0.08);

    /* --- Transition --- */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}