/**
 * Sand Drop - Main Stylesheet
 * Modern glass-morphism design with neon accents
 */

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

:root {
    /* Color Palette */
    --bg-primary: #0a0c14;
    --bg-secondary: #121624;
    --bg-tertiary: #1e2230;
    --accent-cyan: #00f7ff;
    --accent-magenta: #ff00c8;
    --accent-purple: #9d00ff;
    --text-primary: #ffffff;
    --text-secondary: #a0a8c0;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(0, 247, 255, 0.15);
    --neon-shadow: 0 0 20px rgba(0, 247, 255, 0.3);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 20px;
    --spacing-xl: 30px;
    
    /* Border Radius */
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 24px;
    --radius-xl: 30px;
    --radius-full: 50%;
}

body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background: #05060a;
    width: 100vw;
    height: 100vh;
    font-family: 'Inter', sans-serif;
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App Container - dimensions set by JS */
.app-container {
    position: relative;
    overflow: hidden;
    background: radial-gradient(circle at 50% 0%, #1a1e2a, var(--bg-primary));
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    transition: transform 0.2s ease;
}

/* Screens */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.screen.hidden {
    transform: translateX(100%);
    display: none;
}

/* Hide scrollbar but keep functionality */
.screen::-webkit-scrollbar {
    width: 0;
    background: transparent;
}

/* ========== SPLASH SCREEN ========== */
.splash-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    background: var(--bg-primary);
}

.splash-content {
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.splash-logo {
    font-size: 48px;
    font-weight: 800;
    letter-spacing: 8px;
}

.splash-logo span {
    display: inline-block;
    animation: bounce 1.5s ease infinite;
    background: linear-gradient(135deg, #fff, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation-delay: calc(0.1s * var(--i, 1));
}

.splash-logo.accent span {
    background: linear-gradient(135deg, var(--accent-magenta), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.splash-logo.accent {
    margin-top: 10px;
}

.loading-bar {
    width: 200px;
    height: 4px;
    background: var(--glass-bg);
    border-radius: 2px;
    margin: var(--spacing-xl) auto 0;
    overflow: hidden;
}

.loading-progress {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-magenta));
    animation: load 2s ease forwards;
}

/* ========== HOME SCREEN ========== */
.home-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
}

.home-header {
    padding: var(--spacing-lg) 0;
}

.home-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    background: linear-gradient(135deg, #fff, var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
}

.home-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: 400px;
    margin: 0 auto;
    width: 100%;
}

/* Logo Animation */
.home-logo {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 40px;
}

.logo-block {
    width: 45px;
    height: 45px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--accent-cyan);
    animation: float 3s ease infinite;
    animation-delay: calc(0.1s * var(--i));
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
}

.logo-block:hover {
    transform: translateY(-5px);
    box-shadow: var(--neon-shadow);
}

.logo-block.accent {
    color: var(--accent-magenta);
    border-color: rgba(255, 0, 200, 0.3);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.action-btn {
    width: 100%;
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius-xl);
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Inter', sans-serif;
}

.action-btn.primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: var(--bg-primary);
    box-shadow: 0 10px 30px rgba(0, 247, 255, 0.3);
}

.action-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(0, 247, 255, 0.4);
}

.action-btn.secondary {
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.action-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent-cyan);
}

.action-btn:active {
    transform: scale(0.98);
}

.action-btn i {
    font-size: 20px;
}

/* Settings Panel */
.settings-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    margin-bottom: var(--spacing-lg);
}

.settings-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--spacing-md);
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: var(--spacing-lg);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.setting-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
}

.setting-label i {
    width: 20px;
    color: var(--accent-cyan);
}

.setting-control {
    display: flex;
    align-items: center;
    gap: 10px;
}

.setting-slider {
    width: 150px;
    height: 4px;
    -webkit-appearance: none;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-magenta));
    border-radius: 2px;
    outline: none;
}

.setting-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: var(--radius-full);
    border: 2px solid var(--accent-cyan);
    cursor: pointer;
    transition: all 0.2s ease;
}

.setting-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 15px var(--accent-cyan);
}

.slider-value {
    min-width: 25px;
    font-size: 14px;
    color: var(--accent-cyan);
}

/* Quick Stats */
.quick-stats {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.stat-chip {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 13px;
    backdrop-filter: blur(5px);
}

.stat-chip i {
    color: var(--accent-cyan);
}

/* ========== GAME SCREEN ========== */
.game-screen {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    border-color: var(--accent-cyan);
}

.icon-btn:active {
    transform: scale(0.95);
}

.game-stats {
    display: flex;
    gap: 20px;
}

.game-stats .stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
}

.game-stats .stat i {
    color: var(--accent-cyan);
    font-size: 14px;
}

/* Game Area */
.game-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
}

.canvas-container {
    position: relative;
    width: 100%;
    margin: 0 auto;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 2px solid var(--glass-border);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

#p5-canvas {
    width: 100%;
    height: 100%;
}

#p5-canvas canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}

/* Next Piece Preview */
.next-piece {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    backdrop-filter: blur(5px);
    z-index: 10;
}

.next-label {
    font-size: 10px;
    color: var(--text-secondary);
    display: block;
    text-align: center;
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 1px;
}

#nextPieceCanvas {
    width: 48px;
    height: 48px;
    display: block;
}

/* Touch Controls */
.touch-controls {
    margin-top: 20px;
}

.control-row {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.control-btn {
    width: 65px;
    height: 65px;
    border: none;
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    transition: all 0.1s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(5px);
}

.control-btn:active {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    transform: scale(0.95);
    color: var(--bg-primary);
}

/* Level Progress */
.level-progress {
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 var(--spacing-md) var(--spacing-md);
}

.level-info {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--accent-cyan);
}

.progress-track {
    flex: 1;
    height: 6px;
    background: var(--glass-bg);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-magenta));
    border-radius: 3px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Overlays */
.pause-overlay,
.gameover-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
}

.pause-overlay.hidden,
.gameover-overlay.hidden {
    display: none;
}

.pause-menu,
.gameover-menu {
    background: var(--bg-secondary);
    border: 2px solid var(--glass-border);
    border-radius: 32px;
    padding: var(--spacing-xl);
    text-align: center;
    min-width: 280px;
    animation: slideUp 0.3s ease;
}

.pause-menu h3,
.gameover-menu h3 {
    font-size: 28px;
    margin-bottom: var(--spacing-lg);
    color: var(--accent-cyan);
    font-weight: 700;
}

.gameover-icon {
    font-size: 50px;
    color: gold;
    margin-bottom: 15px;
}

.gameover-stats {
    margin: 20px 0;
}

.gameover-stat {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    border-bottom: 1px solid var(--glass-border);
}

.gameover-stat:last-child {
    border-bottom: none;
}

.menu-btn {
    width: 100%;
    padding: 14px;
    margin: 8px 0;
    border: none;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.2s ease;
    font-family: 'Inter', sans-serif;
}

.menu-btn.primary {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    border: none;
    color: var(--bg-primary);
}

.menu-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.menu-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 247, 255, 0.3);
}

.menu-btn:active {
    transform: scale(0.98);
}

/* Animations */
@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes bounce {
    0%, 100% { 
        transform: translateY(0); 
    }
    50% { 
        transform: translateY(-15px); 
    }
}

@keyframes float {
    0%, 100% { 
        transform: translateY(0); 
    }
    50% { 
        transform: translateY(-8px); 
    }
}

@keyframes load {
    0% { 
        width: 0%; 
    }
    100% { 
        width: 100%; 
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 480px) {
    .game-stats {
        gap: 12px;
    }
    
    .game-stats .stat {
        font-size: 12px;
    }
    
    .control-btn {
        width: 55px;
        height: 55px;
        font-size: 20px;
    }
    
    .home-logo {
        gap: 4px;
    }
    
    .logo-block {
        width: 35px;
        height: 35px;
        font-size: 18px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states for keyboard navigation */
button:focus-visible {
    outline: 2px solid var(--accent-cyan);
    outline-offset: 2px;
}