/**
 * JigsawStation Design System
 * CSS Variables for consistent styling across all pages
 */

/* ==========================================================================
   CSS Reset
   ========================================================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ==========================================================================
   CSS Variables - Light Mode (Default)
   ========================================================================== */

:root {
    /* Colors - Refined Palette: Clean whites with slate accent */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #111827;
    --slate-900: #0f172a;
    --cyan-500: #06b6d4;
    --cyan-600: #0891b2;

    /* Typography */
    --font-display: 'Raleway', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'DM Sans', sans-serif;

    /* Spacing */
    --spacing-unit: 8px;

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

    /* New design tokens */
    --nh-bg:      #ffffff;
    --nh-surface: #f7f8fa;
    --nh-surface2:#eef0f4;
    --nh-border:  #e2e6ed;
    --nh-text:    #1a202c;
    --nh-sub:     #4a5568;
    --nh-muted:   #a0aec0;
    --nh-accent:  #7AAACE;
    --nh-hi:      #5b8fb5;
}

/* ==========================================================================
   Base Styles
   ========================================================================== */

body {
    font-family: var(--font-body);
    background-color: #ffffff;
    background-repeat: repeat;
    color: var(--slate-900);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Theme Toggle Button
   ========================================================================== */

.theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: rgba(0, 0, 0, 0.1);
    transform: scale(1.05);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--slate-900);
}

/* ==========================================================================
   Dark Mode - Manual Toggle
   ========================================================================== */

body.dark-mode {
    /* Color Variable Overrides */
    --white: #1a1a1a;
    --gray-50: #1f1f1f;
    --gray-100: #2a2a2a;
    --gray-200: #3a3a3a;
    --gray-300: #4a4a4a;
    --gray-600: #a0a0a0;
    --gray-700: #d1d1d1;
    --gray-900: #f5f5f5;
    --slate-900: #f5f5f5;

    /* Background & Text */
    background-color: #111827;
    color: #f5f5f5;
    --nh-bg:      #111827;
    --nh-surface: #1a2234;
    --nh-surface2:#1e2840;
    --nh-border:  #2d3a50;
    --nh-text:    #e2e8f0;
    --nh-sub:     #94a3b8;
    --nh-muted:   #4a5568;
    --nh-accent:  #7AAACE;
    --nh-hi:      #9bbede;
}

/* Dark Mode - Header */
body.dark-mode header {
    background: #111111;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: none;
}

/* Dark Mode - Puzzle Items */
body.dark-mode .puzzle-item {
    background: #2a2a2a;
    border: 1px solid #3a3a3a;
}

body.dark-mode .puzzle-item:hover {
    border-color: #4a4a4a;
}

body.dark-mode .puzzle-image-wrapper {
    background: #3a3a3a;
}

body.dark-mode .puzzle-name {
    color: #f5f5f5;
}

body.dark-mode .puzzle-category {
    color: #a0a0a0;
}

/* Dark Mode - Category Buttons */
body.dark-mode .category-btn {
    background: #2a2a2a;
    border-color: #3a3a3a;
    color: #a0a0a0;
}

body.dark-mode .category-btn:hover {
    color: #f5f5f5;
    background: #3a3a3a;
    border-color: #4a4a4a;
}

body.dark-mode .category-btn.active {
    background: var(--cyan-600);
    border-color: var(--cyan-600);
    color: white;
}

/* Dark Mode - Badges & Overlays */
body.dark-mode .play-overlay {
    background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.7) 100%);
}

body.dark-mode .play-btn {
    background: rgba(42, 42, 42, 0.95);
}

body.dark-mode .spinner {
    border-color: #3a3a3a;
    border-top-color: var(--cyan-600);
}

/* Dark Mode - Logo & Stats */
body.dark-mode .logo {
    color: #f5f5f5;
}

body.dark-mode .stat strong {
    color: #f5f5f5;
}

/* Dark Mode - Theme Toggle */
body.dark-mode .theme-toggle {
    background: rgba(255, 255, 255, 0.1);
}

body.dark-mode .theme-toggle:hover {
    background: rgba(255, 255, 255, 0.15);
}

body.dark-mode .theme-toggle svg {
    fill: #f5f5f5;
}

/* Dark Mode - Footer */
body.dark-mode footer {
    background: #1f1f1f;
    border-top: 1px solid #3a3a3a;
}

body.dark-mode .footer-section h3 {
    color: #f5f5f5;
}

body.dark-mode .footer-links a {
    color: #a0a0a0;
}

body.dark-mode .footer-links a:hover {
    color: var(--cyan-500);
}

body.dark-mode .footer-bottom {
    border-top: 1px solid #3a3a3a;
}

body.dark-mode .footer-copyright {
    color: #a0a0a0;
}

body.dark-mode .social-link {
    background: #3a3a3a;
    color: #a0a0a0;
}

body.dark-mode .social-link:hover {
    background: var(--cyan-600);
    color: white;
}

/* Dark Mode - Section Headers */
body.dark-mode .section-header h1,
body.dark-mode .section-header h2 {
    color: #f5f5f5;
}

/* Dark Mode - Breadcrumb */
body.dark-mode .breadcrumb {
    color: #a0a0a0;
}

body.dark-mode .breadcrumb a {
    color: #a0a0a0;
}

body.dark-mode .breadcrumb a:hover {
    color: var(--cyan-500);
}

/* Dark Mode - Category Hero */
body.dark-mode .category-hero {
    background: linear-gradient(135deg, #2a3a4a 0%, #1f2f3f 100%);
}

body.dark-mode .category-title {
    color: #f5f5f5;
}

body.dark-mode .category-description {
    color: #d1d1d1;
}

/* Dark Mode - Difficulty Filter */
body.dark-mode .filter-label {
    color: #f5f5f5;
}

body.dark-mode .difficulty-btn {
    background: #2a2a2a;
    border-color: #3a3a3a;
    color: #a0a0a0;
}

body.dark-mode .difficulty-btn:hover {
    color: #f5f5f5;
    background: #3a3a3a;
    border-color: #4a4a4a;
}

body.dark-mode .difficulty-btn.active {
    background: var(--cyan-600);
    border-color: var(--cyan-600);
    color: white;
}

/* Dark Mode - Content Pages */
body.dark-mode .content-container h1,
body.dark-mode .content-section h2,
body.dark-mode .content-section h3 {
    color: #f5f5f5;
}

body.dark-mode .content-section p,
body.dark-mode .content-section li {
    color: #d1d1d1;
}

body.dark-mode .content-container .last-updated {
    color: #a0a0a0;
}

body.dark-mode .content-section a {
    color: var(--cyan-500);
}

body.dark-mode .content-section a:hover {
    color: var(--cyan-400);
}

body.dark-mode .section-header p {
    color: #a0a0a0;
}

/* ==========================================================================
   Dark Mode - System Preference (Auto-detect)
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    body:not(.light-mode) {
        /* Color Variable Overrides */
        --white: #1a1a1a;
        --gray-50: #1f1f1f;
        --gray-100: #2a2a2a;
        --gray-200: #3a3a3a;
        --gray-300: #4a4a4a;
        --gray-600: #a0a0a0;
        --gray-700: #d1d1d1;
        --gray-900: #f5f5f5;
        --slate-900: #f5f5f5;

        /* Background & Text */
        background-color: #111827;
        color: #f5f5f5;
    }

    /* Auto Dark Mode - Header */
    body:not(.light-mode) header {
        background: #111111;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        box-shadow: none;
    }

    /* Auto Dark Mode - Puzzle Items */
    body:not(.light-mode) .puzzle-item {
        background: #2a2a2a;
        border: 1px solid #3a3a3a;
    }

    body:not(.light-mode) .puzzle-item:hover {
        border-color: #4a4a4a;
    }

    body:not(.light-mode) .puzzle-image-wrapper {
        background: #3a3a3a;
    }

    body:not(.light-mode) .puzzle-name {
        color: #f5f5f5;
    }

    body:not(.light-mode) .puzzle-category {
        color: #a0a0a0;
    }

    /* Auto Dark Mode - Category Buttons */
    body:not(.light-mode) .category-btn {
        background: #2a2a2a;
        border-color: #3a3a3a;
        color: #a0a0a0;
    }

    body:not(.light-mode) .category-btn:hover {
        color: #f5f5f5;
        background: #3a3a3a;
        border-color: #4a4a4a;
    }

    body:not(.light-mode) .category-btn.active {
        background: var(--cyan-600);
        border-color: var(--cyan-600);
        color: white;
    }

    /* Auto Dark Mode - Badges & Overlays */
    body:not(.light-mode) .play-overlay {
        background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.7) 100%);
    }

    body:not(.light-mode) .play-btn {
        background: rgba(42, 42, 42, 0.95);
    }

    body:not(.light-mode) .spinner {
        border-color: #3a3a3a;
        border-top-color: var(--cyan-600);
    }

    /* Auto Dark Mode - Logo & Stats */
    body:not(.light-mode) .logo {
        color: #f5f5f5;
    }

    body:not(.light-mode) .stat strong {
        color: #f5f5f5;
    }

    /* Auto Dark Mode - Theme Toggle */
    body:not(.light-mode) .theme-toggle {
        background: rgba(255, 255, 255, 0.1);
    }

    body:not(.light-mode) .theme-toggle:hover {
        background: rgba(255, 255, 255, 0.15);
    }

    body:not(.light-mode) .theme-toggle svg {
        fill: #f5f5f5;
    }

    /* Auto Dark Mode - Footer */
    body:not(.light-mode) footer {
        background: #1f1f1f;
        border-top: 1px solid #3a3a3a;
    }

    body:not(.light-mode) .footer-section h3 {
        color: #f5f5f5;
    }

    body:not(.light-mode) .footer-links a {
        color: #a0a0a0;
    }

    body:not(.light-mode) .footer-links a:hover {
        color: var(--cyan-500);
    }

    body:not(.light-mode) .footer-bottom {
        border-top: 1px solid #3a3a3a;
    }

    body:not(.light-mode) .footer-copyright {
        color: #a0a0a0;
    }

    body:not(.light-mode) .social-link {
        background: #3a3a3a;
        color: #a0a0a0;
    }

    body:not(.light-mode) .social-link:hover {
        background: var(--cyan-600);
        color: white;
    }

    /* Auto Dark Mode - Section Headers */
    body:not(.light-mode) .section-header h1,
    body:not(.light-mode) .section-header h2 {
        color: #f5f5f5;
    }

    body:not(.light-mode) .section-header p {
        color: #a0a0a0;
    }
}