/* ═══════════════════════════════════════════════════════
   WordDuel — Design Tokens v2 (3D / Glassmorphism)
   ═══════════════════════════════════════════════════════ */

:root {
    /* ── Colors: Light Mode ("Sky Playground") ──────── */
    --bg-primary: #DBEAFE;
    --bg-secondary: #EFF6FF;
    --bg-card: rgba(255, 255, 255, 0.7);
    --bg-input: rgba(255, 255, 255, 0.6);
    --bg-overlay: rgba(0, 0, 0, 0.4);

    /* Gradient background */
    --bg-gradient-from: #DBEAFE;
    --bg-gradient-to: #EFF6FF;
    --bg-pattern-opacity: 0.06;

    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --text-inverse: #FFFFFF;

    /* Core blue accent (consistent in both modes) */
    --accent-primary: #3B82F6;
    --accent-primary-hover: #2563EB;
    --accent-primary-light: rgba(59, 130, 246, 0.12);
    --accent-secondary: #06B6D4;
    --accent-secondary-hover: #0891B2;

    /* Tile/keyboard base gradient */
    --tile-gradient-from: #3B82F6;
    --tile-gradient-to: #60A5FA;
    --tile-shadow-color: #1D4ED8;

    /* State colors (same in both modes) */
    --correct: #22C55E;
    --correct-to: #4ADE80;
    --correct-shadow: #15803D;
    --correct-light: rgba(34, 197, 94, 0.15);

    --present: #F59E0B;
    --present-to: #FBBF24;
    --present-shadow: #B45309;
    --present-light: rgba(245, 158, 11, 0.15);

    --absent: #475569;
    --absent-to: #64748B;
    --absent-shadow: #1E293B;
    --absent-light: rgba(75, 85, 99, 0.15);

    --danger: #EF4444;
    --danger-hover: #DC2626;
    --danger-to: #F87171;
    --danger-shadow: #991B1B;
    --warning: #F59E0B;
    --info: #3B82F6;

    /* Gem / gold */
    --gem-gold: #F59E0B;
    --gem-glow: rgba(245, 158, 11, 0.4);
    --gold: #F59E0B;
    --gold-to: #FBBF24;
    --gold-shadow: #B45309;

    /* Purple variant */
    --purple: #8B5CF6;
    --purple-to: #A78BFA;
    --purple-shadow: #5B21B6;

    --border-color: rgba(59, 130, 246, 0.15);
    --border-light: rgba(59, 130, 246, 0.08);

    /* Keyboard (vibrant blue in both modes) */
    --keyboard-bg: #3B82F6;
    --keyboard-text: #FFFFFF;
    --tile-border: rgba(255, 255, 255, 0.5);
    --tile-empty-bg: rgba(59, 130, 246, 0.08);
    --tile-empty-border: rgba(59, 130, 246, 0.2);

    /* ── Typography ────────────────────────────────── */
    --font-heading: 'Fredoka One', 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Nunito', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.5rem;
    --text-6xl: 4.5rem;
    --text-7xl: 5.5rem;

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

    --leading-tight: 1.2;
    --leading-normal: 1.5;
    --leading-relaxed: 1.7;

    /* ── Spacing ───────────────────────────────────── */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --space-5xl: 7rem;
    --space-6xl: 10rem;

    /* ── Border Radius (rounder feel) ──────────────── */
    --radius-xs: 0.375rem;
    --radius-sm: 0.625rem;
    --radius-md: 0.875rem;
    --radius-lg: 1.125rem;
    --radius-xl: 1.375rem;
    --radius-2xl: 1.75rem;
    --radius-full: 9999px;

    /* ── Shadows (blue-tinted) ─────────────────────── */
    --shadow-xs: 0 1px 2px rgba(30, 58, 138, 0.08);
    --shadow-sm: 0 2px 6px rgba(30, 58, 138, 0.1);
    --shadow-md: 0 4px 14px rgba(30, 58, 138, 0.12);
    --shadow-lg: 0 8px 30px rgba(30, 58, 138, 0.15);
    --shadow-xl: 0 16px 48px rgba(30, 58, 138, 0.2);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);
    --shadow-glow-strong: 0 0 40px rgba(59, 130, 246, 0.5);

    /* 3D depth shadows for tiles & keys */
    --tile-shadow: 0 5px 0 var(--tile-shadow-color), 0 6px 12px rgba(0, 0, 0, 0.15);
    --tile-shadow-correct: 0 5px 0 var(--correct-shadow), 0 6px 12px rgba(0, 0, 0, 0.15);
    --tile-shadow-present: 0 5px 0 var(--present-shadow), 0 6px 12px rgba(0, 0, 0, 0.15);
    --tile-shadow-absent: 0 5px 0 var(--absent-shadow), 0 6px 12px rgba(0, 0, 0, 0.15);
    --key-shadow: 0 4px 0 var(--tile-shadow-color), 0 5px 10px rgba(0, 0, 0, 0.12);

    /* Button variant shadows */
    --btn-shadow-green: 0 5px 0 #15803D, 0 6px 12px rgba(0, 0, 0, 0.15);
    --btn-shadow-blue: 0 5px 0 #1D4ED8, 0 6px 12px rgba(0, 0, 0, 0.15);
    --btn-shadow-purple: 0 5px 0 var(--purple-shadow), 0 6px 12px rgba(0, 0, 0, 0.15);
    --btn-shadow-gold: 0 5px 0 var(--gold-shadow), 0 6px 12px rgba(0, 0, 0, 0.15);
    --btn-shadow-danger: 0 5px 0 var(--danger-shadow), 0 6px 12px rgba(0, 0, 0, 0.15);

    /* ── Glass Effect (light = white glass) ────────── */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-blur: blur(24px);
    --glass-border: 1px solid rgba(255, 255, 255, 0.5);
    --glass-bg-strong: rgba(255, 255, 255, 0.85);
    --glass-bg-subtle: rgba(255, 255, 255, 0.4);

    /* ── Transitions ───────────────────────────────── */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-smooth: 600ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* ── Z-index Scale ─────────────────────────────── */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal-backdrop: 300;
    --z-modal: 400;
    --z-toast: 500;
    --z-tooltip: 600;

    /* ── Layout ─────────────────────────────────────── */
    --max-width: 1200px;
    --max-width-sm: 640px;
    --max-width-game: 500px;
    --header-height: 64px;

    /* ── Game-specific ─────────────────────────────── */
    --tile-size: 62px;
    --tile-gap: 6px;
    --key-height: 58px;
    --key-width: 44px;
    --key-gap: 6px;
    --tile-border-width: 2px;
    --tile-3d-depth: 5px;
    --key-3d-depth: 4px;
}

/* ── Dark Mode ("Night Arena") ─────────────────────── */
[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-card: rgba(30, 58, 138, 0.25);
    --bg-input: rgba(30, 58, 138, 0.3);
    --bg-overlay: rgba(0, 0, 0, 0.6);

    --bg-gradient-from: #0F172A;
    --bg-gradient-to: #1E293B;
    --bg-pattern-opacity: 0.04;

    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-tertiary: #64748B;
    --text-inverse: #0F172A;

    --accent-primary: #3B82F6;
    --accent-primary-hover: #60A5FA;
    --accent-primary-light: rgba(59, 130, 246, 0.15);
    --accent-secondary: #22D3EE;
    --accent-secondary-hover: #06B6D4;

    --danger: #F87171;
    --danger-hover: #FCA5A5;
    --warning: #FBBF24;
    --info: #60A5FA;

    --gem-gold: #FBBF24;
    --gem-glow: rgba(251, 191, 36, 0.4);

    --border-color: rgba(59, 130, 246, 0.2);
    --border-light: rgba(59, 130, 246, 0.1);

    --keyboard-bg: #3B82F6;
    --keyboard-text: #FFFFFF;
    --tile-border: rgba(255, 255, 255, 0.4);
    --tile-empty-bg: rgba(59, 130, 246, 0.12);
    --tile-empty-border: rgba(59, 130, 246, 0.25);

    /* Shadows (darker) */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.35);
    --shadow-glow-strong: 0 0 40px rgba(59, 130, 246, 0.55);

    /* Glass (blue-tinted dark glass) */
    --glass-bg: rgba(15, 23, 42, 0.7);
    --glass-border: 1px solid rgba(59, 130, 246, 0.15);
    --glass-bg-strong: rgba(15, 23, 42, 0.85);
    --glass-bg-subtle: rgba(15, 23, 42, 0.4);
}