/* ===========================
   Full-Viewport Zen Mode
   Gem Beats Match-3 Puzzle
   =========================== */

:root {
    --bg-primary: #0a0e1a;
    --accent-primary: #00d9ff;
    --accent-secondary: #ff00ff;
    --text-primary: #e0e6f0;
    --border-glow: rgba(0, 217, 255, 0.3);
    --transition-medium: 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
}

body {
    touch-action: none;
    overscroll-behavior: none;
    -webkit-user-select: none;
    user-select: none;
}

#app {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
}

#game-canvas {
    display: block;
    touch-action: none;
    cursor: pointer;
}

/* Game Over Overlay */
#game-over {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
}

#game-over .overlay {
    text-align: center;
    padding: 2rem;
}

#game-over h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#game-over p {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.primary-btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    box-shadow: 0 4px 15px rgba(0, 217, 255, 0.4);
    transition: all var(--transition-medium);
    touch-action: manipulation;
}

.primary-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 8px rgba(0, 217, 255, 0.6);
}

/* Reduce Motion Support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    #game-canvas {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}