/* ============================================================
   Dark Grid Arcade – Base Design System
   themes/dark-grid-arcade/assets/css/base.css
   
   CSS custom properties, reset, typography, utility classes.
   Shared across ALL layout variants.
   ============================================================ */

/* === CSS CUSTOM PROPERTIES === */
:root {
    /* Colors – Electric Cyan Dark Gaming */
    --color-primary: #00d9ff;
    --color-primary-hover: #33e6ff;
    --color-primary-dark: #00b8d4;
    --color-secondary: #9333ea;
    --color-accent: #06b6d4;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* Backgrounds */
    --bg-body: #0a0a14;
    --bg-surface: #12121f;
    --bg-card: #1a202e;
    --bg-card-hover: #242a3e;
    --bg-input: #15172b;
    --bg-header: rgba(10, 10, 20, 0.98);
    --bg-overlay: rgba(0, 0, 0, 0.7);

    /* Text */
    --text-primary: #f0f4f8;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #0f172a;
    --text-link: #00d9ff;

    /* Borders */
    --border-color: rgba(0, 217, 255, 0.1);
    --border-subtle: rgba(255, 255, 255, 0.05);
    --border-focus: #00d9ff;

    /* 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;

    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(0, 217, 255, 0.25);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-glow-intense: 0 0 60px rgba(0, 217, 255, 0.4);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --font-display: 'Poppins', 'Inter', sans-serif;

    /* Font Sizes */
    --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: 1.875rem;
    --text-4xl: 2.25rem;

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

    /* Layout */
    --header-height: 64px;
    --sidebar-width: 260px;
    --max-width: 1400px;
    --game-card-width: 180px;

    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-header: 300;
    --z-overlay: 400;
    --z-modal: 500;
    --z-toast: 600;
}

/* === RESET === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Ambient background radials */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(6, 182, 212, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

a {
    color: var(--text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary-hover); }

img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}
h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
p { margin-bottom: var(--space-md); }

::selection {
    background: var(--color-primary);
    color: white;
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-surface); }
::-webkit-scrollbar-thumb { background: var(--color-primary-dark); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

/* === CONTAINERS === */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--space-lg);
}

/* === UTILITY CLASSES === */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }

.mt-1 { margin-top: var(--space-md); }
.mt-2 { margin-top: var(--space-xl); }
.mt-3 { margin-top: var(--space-2xl); }
.mb-1 { margin-bottom: var(--space-md); }
.mb-2 { margin-bottom: var(--space-xl); }
.mb-3 { margin-bottom: var(--space-2xl); }

.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-md); }
.gap-2 { gap: var(--space-xl); }

.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; clip: rect(0,0,0,0); overflow: hidden; }

/* === BREADCRUMB === */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb .sep { opacity: 0.4; }

/* === LOADING & SKELETON === */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.skeleton {
    background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* === Phase 89: Light Mode Override ===================================== */
[data-theme="light"] {
    --bg-body:        #f5f7fa;
    --bg-surface:     #ffffff;
    --bg-card:        #ffffff;
    --bg-card-hover:  #f0f2f5;
    --bg-input:       #f0f2f5;
    --bg-header:      rgba(255, 255, 255, 0.98);
    --bg-overlay:     rgba(0, 0, 0, 0.5);

    --text-primary:   #0f172a;
    --text-secondary: #475569;
    --text-muted:     #94a3b8;
    --text-inverse:   #f0f4f8;
    --text-link:      #0284c7;

    --border-color:   #cbd5e1;
    --border-subtle:  #e2e8f0;
}

[data-theme="light"] body {
    background-color: var(--bg-body);
    color: var(--text-primary);
}

[data-theme="light"] .header,
[data-theme="light"] .nav,
[data-theme="light"] nav {
    background: var(--bg-header) !important;
    border-bottom-color: var(--border-subtle) !important;
}

[data-theme="light"] .card,
[data-theme="light"] .game-card,
[data-theme="light"] .stat-card {
    background: var(--bg-card) !important;
    border-color: var(--border-subtle) !important;
    color: var(--text-primary) !important;
}

[data-theme="light"] .sidebar,
[data-theme="light"] .drawer {
    background: var(--bg-surface) !important;
}

[data-theme="light"] input,
[data-theme="light"] select,
[data-theme="light"] textarea {
    background: var(--bg-input) !important;
    color: var(--text-primary) !important;
    border-color: var(--border-color) !important;
}