/* src/styles/variables.css - Centralized Design Tokens System (Calm, Professional & Educational) */

:root {
  /* ========================================================
     1. TYPOGRAPHY
     ======================================================== */
  --font-family: 'Cairo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-md: 1.125rem;   /* 18px */
  --font-size-lg: 1.25rem;    /* 20px */
  --font-size-xl: 1.5rem;     /* 24px */
  --font-size-2xl: 1.875rem;  /* 30px */
  --font-size-3xl: 2.25rem;   /* 36px */
  --font-size-4xl: 3rem;      /* 48px */

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  --font-weight-black: 900;

  --line-height-tight: 1.25;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;

  /* ========================================================
     2. SPACING SCALE (4px base system)
     ======================================================== */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --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 */

  /* ========================================================
     3. BORDER RADIUS (Clean & Compact)
     ======================================================== */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-pill: 9999px;
  --radius-full: 9999px;

  /* ========================================================
     4. TRANSITIONS & TIMINGS (Quick & Micro-interactions: 150ms-250ms)
     ======================================================== */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.3s cubic-bezier(0.16, 1, 0.3, 1);

  /* ========================================================
     5. STATUS & FEEDBACK COLORS (Muted & Accessible)
     ======================================================== */
  --success: #10b981;
  --success-hover: #059669;
  --success-bg: rgba(16, 185, 129, 0.10);
  --success-border: rgba(16, 185, 129, 0.25);

  --warning: #d97706;
  --warning-hover: #b45309;
  --warning-bg: rgba(217, 119, 6, 0.10);
  --warning-border: rgba(217, 119, 6, 0.25);

  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --danger-bg: rgba(220, 38, 38, 0.10);
  --danger-border: rgba(220, 38, 38, 0.25);

  --info: #2563eb;
  --info-hover: #1d4ed8;
  --info-bg: rgba(37, 99, 235, 0.10);
  --info-border: rgba(37, 99, 235, 0.25);

  /* Status Aliases */
  --color-success: var(--success);
  --color-success-hover: var(--success-hover);
  --color-success-bg: var(--success-bg);
  --color-success-border: var(--success-border);

  --color-warning: var(--warning);
  --color-warning-hover: var(--warning-hover);
  --color-warning-bg: var(--warning-bg);
  --color-warning-border: var(--warning-border);

  --color-danger: var(--danger);
  --color-danger-hover: var(--danger-hover);
  --color-danger-bg: var(--danger-bg);
  --color-danger-border: var(--danger-border);

  --color-info: var(--info);
  --color-info-hover: var(--info-hover);
  --color-info-bg: var(--info-bg);
  --color-info-border: var(--info-border);

  /* Egyptian Warm Gold Accent */
  --color-gold: #d97706;
  --color-gold-light: #f59e0b;
  --color-gold-bg: rgba(217, 119, 6, 0.10);
  --color-gold-border: rgba(217, 119, 6, 0.25);
  --gold: var(--color-gold);
  --gold-light: var(--color-gold-light);
  --gold-glow: rgba(217, 119, 6, 0.15);

  /* Z-Index Scale */
  --z-base: 1;
  --z-card: 2;
  --z-sticky: 50;
  --z-overlay: 95;
  --z-drawer: 101;
  --z-modal: 2000;
  --z-toast: 9999;

  /* ========================================================
     6. DEFAULT THEME: GREEN (Calm Dark Neutral / Charcoal)
     ======================================================== */
  --bg-primary: #121519;
  --bg-secondary: #181c22;

  --surface-primary: #1f242d;
  --surface-secondary: #262c37;
  --surface-hover: rgba(255, 255, 255, 0.04);
  --surface-glass: rgba(24, 28, 34, 0.90);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #121519;

  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.15);
  --border-subtle: rgba(255, 255, 255, 0.05);

  /* Calm Muted Emerald Green */
  --primary: #10b981;
  --primary-hover: #059669;
  --primary-active: #047857;
  --primary-soft: rgba(16, 185, 129, 0.10);
  --primary-glow: rgba(16, 185, 129, 0.15);

  /* Legacy & Semantic Aliases */
  --color-primary: var(--primary);
  --color-primary-hover: var(--primary-hover);
  --color-primary-active: var(--primary-active);
  --color-primary-soft: var(--primary-soft);
  --color-primary-glow: var(--primary-glow);
  --color-primary-light: #34d399;

  --color-accent: var(--primary);
  --color-accent-hover: var(--primary-hover);
  --accent: var(--primary);
  --accent-secondary: var(--primary-hover);
  --accent-glow: var(--primary-glow);
  --accent-glow-subtle: var(--primary-soft);

  --color-bg-main: var(--bg-primary);
  --color-bg-secondary: var(--bg-secondary);
  --color-surface-card: var(--surface-primary);
  --color-surface-elevated: var(--surface-secondary);
  --color-surface-glass: var(--surface-glass);

  --panel-bg: var(--surface-primary);
  --panel-secondary: var(--surface-secondary);
  --panel-glass: var(--surface-glass);
  --bg-surface: var(--surface-primary);

  --color-text-primary: var(--text-primary);
  --color-text-secondary: var(--text-secondary);
  --color-text-muted: var(--text-muted);
  --color-text-inverse: var(--text-inverse);
  --text-main: var(--text-primary);
  --text-subtle: var(--text-muted);

  --color-border-primary: rgba(16, 185, 129, 0.22);
  --color-border-subtle: var(--border);
  --color-border-focus: var(--primary);
  --border-primary: var(--color-border-primary);

  /* Subtle, Natural Shadows (No heavy neon blowout) */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 10px 28px rgba(0, 0, 0, 0.45);
  --shadow-accent: 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* ========================================================
   7. THEME: CYAN (Soft Tech Azure / Sky Slate)
   ======================================================== */
[data-theme="cyan"] {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-active: #075985;
  --primary-soft: rgba(2, 132, 199, 0.10);
  --primary-glow: rgba(2, 132, 199, 0.15);
  --color-primary-light: #38bdf8;

  --color-primary: var(--primary);
  --color-primary-hover: var(--primary-hover);
  --color-primary-active: var(--primary-active);
  --color-primary-soft: var(--primary-soft);
  --color-primary-glow: var(--primary-glow);

  --color-border-primary: rgba(2, 132, 199, 0.22);
  --border-primary: var(--color-border-primary);
  --shadow-accent: 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* ========================================================
   8. THEME: PURPLE (Muted Royal Violet)
   ======================================================== */
[data-theme="purple"] {
  --primary: #7c3aed;
  --primary-hover: #6d28d9;
  --primary-active: #5b21b6;
  --primary-soft: rgba(124, 58, 237, 0.10);
  --primary-glow: rgba(124, 58, 237, 0.15);
  --color-primary-light: #a78bfa;

  --color-primary: var(--primary);
  --color-primary-hover: var(--primary-hover);
  --color-primary-active: var(--primary-active);
  --color-primary-soft: var(--primary-soft);
  --color-primary-glow: var(--primary-glow);

  --color-border-primary: rgba(124, 58, 237, 0.22);
  --border-primary: var(--color-border-primary);
  --shadow-accent: 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* ========================================================
   9. THEME: GOLD (Warm Amber / Heritage)
   ======================================================== */
[data-theme="gold"] {
  --primary: #d97706;
  --primary-hover: #b45309;
  --primary-active: #92400e;
  --primary-soft: rgba(217, 119, 6, 0.10);
  --primary-glow: rgba(217, 119, 6, 0.15);
  --color-primary-light: #fbbf24;

  --color-primary: var(--primary);
  --color-primary-hover: var(--primary-hover);
  --color-primary-active: var(--primary-active);
  --color-primary-soft: var(--primary-soft);
  --color-primary-glow: var(--primary-glow);

  --color-border-primary: rgba(217, 119, 6, 0.22);
  --border-primary: var(--color-border-primary);
  --shadow-accent: 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* ========================================================
   10. LIGHT MODE SUPPORT (Soft Off-White / Natural Light)
   ======================================================== */
[data-mode="light"],
body.light-mode {
  --bg-primary: #f6f7f9;
  --bg-secondary: #eef0f3;

  --surface-primary: #ffffff;
  --surface-secondary: #f8fafc;
  --surface-hover: rgba(0, 0, 0, 0.025);
  --surface-glass: rgba(255, 255, 255, 0.92);

  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --text-inverse: #ffffff;

  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --border-subtle: #f1f5f9;

  --color-bg-main: var(--bg-primary);
  --color-bg-secondary: var(--bg-secondary);
  --color-surface-card: var(--surface-primary);
  --color-surface-elevated: var(--surface-secondary);
  --color-surface-glass: var(--surface-glass);

  --panel-bg: var(--surface-primary);
  --panel-secondary: var(--surface-secondary);
  --panel-glass: var(--surface-glass);
  --bg-surface: var(--surface-primary);

  --color-text-primary: var(--text-primary);
  --color-text-secondary: var(--text-secondary);
  --color-text-muted: var(--text-muted);
  --color-text-inverse: var(--text-inverse);
  --text-main: var(--text-primary);
  --text-subtle: var(--text-muted);

  --color-border-subtle: var(--border);
  --color-border-primary: rgba(16, 185, 129, 0.28);
  --border-primary: var(--color-border-primary);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.08);
  --shadow-accent: 0 2px 8px rgba(0, 0, 0, 0.04);
}