/* Design Tokens */
:root {
  /* Colors */
  --color-primary: #0553B1;
  --color-primary-light: #1976D2;
  --color-primary-dark: #003D82;
  --color-accent: #00D9FF;
  --color-accent-light: #4DE8FF;
  --color-secondary: #2B7BE8;
  --color-secondary-light: #6CAAF9;
  --color-tertiary: #4D6487;

  --color-background: #FAFAFA;
  --color-background-alt: #F3F7FC;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;
  --color-surface-soft: #F6F9FF;

  --color-text-primary: #1A1A2E;
  --color-text-secondary: #374151;
  --color-text-muted: #6B7280;

  --color-border: #E2E8F0;
  --color-border-light: #EDF2F7;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Typography Scale (1.25 ratio) */
  --font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', Monaco, 'Andale Mono', monospace;

  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-display: clamp(2.4rem, 5.8vw, 4.6rem);
  --font-size-hero-subtitle: clamp(1.35rem, 2.6vw, 2.2rem);
  --font-size-section-title-fluid: clamp(1.9rem, 4vw, 2.9rem);
  --font-size-section-subtitle: clamp(1rem, 1.6vw, 1.18rem);

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.25;
  --line-height-normal: 1.7;
  --line-height-relaxed: 1.8;
  --line-height-display: 1.08;
  --letter-spacing-tight: -0.02em;

  /* Spacing (8px base) */
  --space-1: 0.25rem;   /* 4px */
  --space-1-5: 0.375rem;   /* 6px */
  --space-2: 0.5rem;    /* 8px */
  --space-2-5: 0.625rem;   /* 10px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  --section-space-y: clamp(4.75rem, 8vw, 6.75rem);
  --section-space-y-compact: clamp(4.25rem, 7vw, 5.75rem);
  --content-measure: 66ch;

  /* Layout */
  --container-max: 1080px;
  --header-height: 64px;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index */
  --z-header: 100;
  --z-overlay: 200;
  --z-modal: 300;

  /* Glow Effects (Light Mode) */
  --glow-primary: 0 0 0 1px rgba(5, 83, 177, 0.08);
  --glow-accent: 0 0 0 1px rgba(0, 217, 255, 0.1);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  --gradient-surface: linear-gradient(180deg, var(--color-background) 0%, var(--color-surface) 100%);
  --section-divider: linear-gradient(90deg, transparent 0%, rgba(5, 83, 177, 0.28) 50%, transparent 100%);
  --hero-wash: radial-gradient(1200px circle at 12% 8%, rgba(5, 83, 177, 0.2) 0%, transparent 55%),
               radial-gradient(900px circle at 90% 20%, rgba(0, 217, 255, 0.16) 0%, transparent 50%);

  /* Code Colors (for terminal) */
  --color-code-bg: #F6F8FA;
  --color-code-green: #22863A;
  --color-code-yellow: #B08800;
  --color-code-purple: #6F42C1;
  --color-code-red: #D73A49;
  --color-code-cyan: #032F62;

  /* Status Colors - Phase 2 UI Components */
  --color-success: #22C55E;
  --color-success-light: rgba(34, 197, 94, 0.15);
  --color-warning: #FBBF24;
  --color-warning-light: rgba(251, 191, 36, 0.15);
  --color-info: #3B82F6;
  --color-info-light: rgba(59, 130, 246, 0.15);

  /* Filter & Badge */
  --filter-active-bg: var(--color-primary);
  --filter-inactive-bg: var(--color-surface);
  --badge-live-color: var(--color-success);
  --badge-dev-color: var(--color-warning);

  /* Category Filter Colors */
  --filter-all: #0553B1;
  --filter-personal: #8B5CF6;
  --filter-company: #10B981;
  --filter-learning: #F59E0B;

  /* Etc Section - Certificate Colors (Gold/Amber) */
  --color-certificate: #F59E0B;
  --color-certificate-light: #FCD34D;
  --color-certificate-dark: #D97706;
  --color-certificate-glow: rgba(245, 158, 11, 0.15);

  /* Etc Section - Learning Colors (Teal/Cyan) */
  --color-learning: #14B8A6;
  --color-learning-light: #5EEAD4;
  --color-learning-dark: #0D9488;
  --color-learning-glow: rgba(20, 184, 166, 0.15);

  /* Project Card Shadows - Single layer */
  --shadow-card-rest: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.1);
}

/* Dark Mode Color System */
[data-theme="dark"] {
  /* Primary stays vibrant for brand consistency */
  --color-primary: #00D9FF;
  --color-primary-light: #4DE8FF;
  --color-primary-dark: #00B4D8;
  --color-accent: #0553B1;
  --color-accent-light: #1976D2;
  --color-secondary: #5FAAFF;
  --color-secondary-light: #94C6FF;
  --color-tertiary: #9AB3D5;

  /* GitHub-inspired dark backgrounds */
  --color-background: #0D1117;
  --color-background-alt: #121821;
  --color-surface: #161B22;
  --color-surface-elevated: #21262D;
  --color-surface-soft: #1A222E;

  /* Text optimized for dark backgrounds */
  --color-text-primary: #E6EDF3;
  --color-text-secondary: #8B949E;
  --color-text-muted: #6E7681;

  /* Project Modal Tokens - Dark Mode */
  --modal-bg: #161B22;
  --modal-panel: #21262D;
  --modal-panel-soft: #0F1722;
  --modal-border-strong: #3A4654;
  --modal-text-high: #E6EDF3;
  --modal-text-body: #C3CDD8;
  --modal-text-muted: #9BA7B4;
  --modal-accent: #00D9FF;
  --modal-warning-surface: rgba(251, 191, 36, 0.10);
  --modal-warning-border: rgba(251, 191, 36, 0.35);
  --modal-success-surface: rgba(74, 222, 128, 0.10);
  --modal-success-border: rgba(74, 222, 128, 0.35);
  --modal-chip-surface: rgba(0, 217, 255, 0.12);
  --modal-chip-border: rgba(0, 217, 255, 0.36);

  /* Border colors */
  --color-border: #30363D;
  --color-border-light: #21262D;

  /* Enhanced shadows for dark mode */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);

  /* Glow effects for dark mode */
  --glow-primary: 0 0 0 1px rgba(0, 217, 255, 0.12);
  --glow-accent: 0 0 0 1px rgba(5, 83, 177, 0.15);
  --section-divider: linear-gradient(90deg, transparent 0%, rgba(0, 217, 255, 0.36) 50%, transparent 100%);
  --hero-wash: radial-gradient(1200px circle at 14% 10%, rgba(0, 217, 255, 0.18) 0%, transparent 55%),
               radial-gradient(900px circle at 88% 18%, rgba(25, 118, 210, 0.2) 0%, transparent 50%);

  /* Code/Terminal colors */
  --color-code-bg: #1A1F26;
  --color-code-green: #7EE787;
  --color-code-yellow: #FFA657;
  --color-code-purple: #A371F7;
  --color-code-red: #FF7B72;
  --color-code-cyan: #79C0FF;

  /* Status Colors - Dark Mode Variants */
  --color-success: #4ADE80;
  --color-success-light: rgba(74, 222, 128, 0.2);
  --color-warning: #FCD34D;
  --color-warning-light: rgba(252, 211, 77, 0.2);
  --color-info: #60A5FA;
  --color-info-light: rgba(96, 165, 250, 0.2);

  /* Filter & Badge - Dark Mode */
  --filter-active-bg: var(--color-primary);
  --filter-inactive-bg: var(--color-surface-elevated);
  --badge-live-color: var(--color-success);
  --badge-dev-color: var(--color-warning);

  /* Category Filter Colors - Dark Mode */
  --filter-all: #00D9FF;
  --filter-personal: #A78BFA;
  --filter-company: #34D399;
  --filter-learning: #FBBF24;

  /* Etc Section - Certificate Colors - Dark Mode */
  --color-certificate: #FBBF24;
  --color-certificate-light: #FDE68A;
  --color-certificate-dark: #F59E0B;
  --color-certificate-glow: rgba(251, 191, 36, 0.25);

  /* Etc Section - Learning Colors - Dark Mode */
  --color-learning: #2DD4BF;
  --color-learning-light: #99F6E4;
  --color-learning-dark: #14B8A6;
  --color-learning-glow: rgba(45, 212, 191, 0.25);

  /* Project Card Shadows - Dark Mode */
  --shadow-card-rest: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.3);
}

/* Prevent flash of unstyled content */
html {
  background-color: #FAFAFA;
}

html[data-theme="dark"] {
  background-color: #0D1117;
}

/* Apply base styles */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-background);
}