/* ============================================
   MODERN TETRIS 2026 - CSS VARIABLES
   ============================================ */
:root {
    /* Colors - 2026 Palette */
    --primary: #7c3aed;
    --primary-hover: #6d28d9;
    --surface: rgba(255, 255, 255, 0.05);
    --surface-hover: rgba(255, 255, 255, 0.08);
    --border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-gold: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --background: #0f0d1a;
    
    /* Legacy variables for theme system compatibility */
    --primary-color: #7c3aed;
    --secondary-color: #4a4489;
    --accent-color: #ff6b6b;
    --background-color: #0f0d1a;
    --text-color: #f8fafc;
    --grid-line-color: rgba(255, 255, 255, 0.1);
    --button-hover-color: #6d28d9;
    
    /* Typography */
    --font-ui: 'Inter', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Smooth transitions for interactive elements */
button, .button, a, 
.panel, .modal, .modal-content,
.achievement-item, .bet-type-card,
input, select, textarea {
    transition-property: background-color, border-color, color, box-shadow, opacity, transform;
    transition-duration: 0.15s;
    transition-timing-function: ease;
}

body {
    font-family: var(--font-ui);
    background: var(--background);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    line-height: 1.6;
}

/* ============================================
   LAYOUT - GRID SYSTEM
   ============================================ */
.game-container {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-areas:
        "left"
        "canvas"
        "right"
        "gamepad"
        "buttons"
        "ai-panel"
        "footer";
    gap: 16px;
    max-width: 100%;
    padding: 16px;
    margin: 0 auto;
}

/* Desktop Layout (≥768px) */
@media (min-width: 768px) {
    .game-container {
        grid-template-columns: 200px auto 200px;
        grid-template-rows: auto auto auto;
        grid-template-areas:
            "left canvas right"
            "buttons buttons buttons"
            "ai-panel ai-panel ai-panel"
            "footer footer footer";
        gap: 16px;
        max-width: 900px;
        padding: 24px;
    }
}

/* Grid Areas */
.left-sidebar {
    grid-area: left;
}

.canvas-area {
    grid-area: canvas;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.right-sidebar {
    grid-area: right;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.virtual-gamepad {
    grid-area: gamepad;
}

.button-bar {
    grid-area: buttons;
}

.ai-vs-ai-panel {
    grid-area: ai-panel;
}

.game-footer {
    grid-area: footer;
}

/* ============================================
   GLASSMORPHISM PANELS
   ============================================ */
.panel {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    padding: 20px;
}

/* ============================================
   SCORE PANEL
   ============================================ */
.score-section {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

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

.stat-label {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-value.balance {
    color: var(--accent-gold);
}

.stat-value.balance::after {
    content: ' TC';
    font-size: 0.9em;
    opacity: 0.8;
}

.balance-item {
    margin-top: 8px;
    padding-top: 12px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* ============================================
   CANVAS STYLING
   ============================================ */
.canvas-wrapper {
    position: relative;
    display: inline-block;
    line-height: 0;
}

#tetris-canvas {
    width: 300px;
    height: 600px;
    border-radius: 8px;
    background-color: rgba(0, 0, 0, 0.6);
    box-shadow: 
        inset 0 0 30px rgba(0, 0, 0, 0.5),
        0 0 40px rgba(124, 58, 237, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.06);
    display: block;
}

/* Show pointer cursor only when canvas can be tapped to start */
#tetris-canvas.canvas-idle {
    cursor: pointer;
}

/* Pulsing "TAP TO PLAY" hint shown on touch screens when game is idle */
.canvas-tap-hint {
    display: none;
    position: absolute;
    bottom: 18%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(124, 58, 237, 0.85);
    color: #fff;
    font-family: var(--font-ui);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.08em;
    padding: 12px 28px;
    border-radius: 40px;
    pointer-events: none;
    white-space: nowrap;
    animation: tap-pulse 1.6s ease-in-out infinite;
    box-shadow: 0 4px 20px rgba(124, 58, 237, 0.5);
}

@keyframes tap-pulse {
    0%, 100% { opacity: 1; transform: translateX(-50%) scale(1); }
    50%       { opacity: 0.65; transform: translateX(-50%) scale(0.96); }
}

/* Show hint only on touch devices when game is not running */
@media (hover: none) and (pointer: coarse) {
    .canvas-tap-hint.visible {
        display: block;
    }
}

@media (min-width: 768px) {
    #tetris-canvas {
        width: 320px;
        height: 640px;
    }
}

@media (max-width: 767px) {
    #tetris-canvas {
        width: calc(100vw - 40px);
        max-width: 300px;
        height: auto;
        aspect-ratio: 1/2;
    }
}

/* ============================================
   NEXT PIECE PANEL
   ============================================ */
.next-piece {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.next-piece h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 600;
}

#next-piece-canvas {
    width: 100px;
    height: 100px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
}

/* ============================================
   AI INSIGHT PANEL
   ============================================ */
.ai-insight {
    background: rgba(124, 58, 237, 0.06);
    border: 1px solid rgba(124, 58, 237, 0.15);
}

.ai-insight h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary);
    margin-bottom: 8px;
    font-weight: 600;
}

.ai-insight p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* ============================================
   CONTROLS PANEL
   ============================================ */
.controls-instructions h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-weight: 600;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.control-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.control-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 22px;
    padding: 0 6px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-secondary);
}

/* Hide controls on small mobile screens */
@media (max-width: 767px) {
    .controls-instructions {
        display: none;
    }
}

/* ============================================
   BUTTON SYSTEM
   ============================================ */
button, .button {
    font-family: var(--font-ui);
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

button:hover, .button:hover {
    transform: translateY(-1px);
}

button:active, .button:active {
    transform: translateY(0px);
}

/* Primary Button */
.button-primary {
    background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    box-shadow: 0 4px 14px rgba(124, 58, 237, 0.3);
}

.button-primary:hover {
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
}

/* Secondary Button - ghost/outlined */
.button-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: #e2e8f0;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 500;
    font-size: 0.9rem;
}

.button-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Icon/Tertiary Button */
.button-icon {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 10px;
    padding: 10px 14px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.button-icon:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

/* Warning Button (for AI mode) */
.button-warning {
    background-color: #ffc107;
    color: #212529;
    padding: 10px 20px;
    border-radius: 10px;
    font-weight: 500;
}

.button-warning:hover {
    background-color: #e0a800;
}

/* ============================================
   BUTTON BAR LAYOUT
   ============================================ */
.button-bar {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.button-group-primary,
.button-group-secondary,
.button-group-tertiary {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.button-group-primary {
    gap: 12px;
}

/* Mobile button adjustments */
@media (max-width: 767px) {
    .button-bar {
        gap: 10px;
    }
    
    .button-group-primary,
    .button-group-secondary,
    .button-group-tertiary {
        gap: 6px;
    }
    
    .button-primary {
        padding: 10px 18px;
        font-size: 0.9rem;
    }
    
    .button-secondary {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    
    .button-icon {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    button, .button {
        min-height: 48px;
        min-width: 48px;
    }
}

/* ============================================
   AI VS AI PANEL
   ============================================ */
.ai-vs-ai-panel {
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 0.5rem;
}

.ai-player {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.75rem;
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border-left: 4px solid;
}

.ai-player-1 {
    border-left-color: #dc3545;
}

.ai-player-2 {
    border-left-color: #007bff;
}

.ai-player h4 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
    font-size: 1rem;
}

.ai-thinking, .ai-plan {
    font-size: 0.8rem;
    line-height: 1.3;
    min-height: 2.5rem;
    padding: 0.5rem;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
}

.game-controls {
    grid-column: 1 / -1;
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 0.5rem;
    flex-wrap: wrap;
}

.current-turn {
    grid-column: 1 / -1;
    text-align: center;
    font-weight: bold;
    padding: 0.5rem;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

#ai1-thinking, #ai2-thinking {
    color: #ffc107;
}

#ai1-plan, #ai2-plan {
    color: #28a745;
}

@media (max-width: 767px) {
    .ai-vs-ai-panel {
        grid-template-columns: 1fr;
    }
    
    .game-controls {
        flex-direction: column;
        align-items: center;
    }
}

/* ============================================
   FOOTER
   ============================================ */
.game-footer {
    text-align: center;
    padding: 16px;
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-muted);
    border-radius: 12px;
    backdrop-filter: blur(8px);
}

.game-footer p {
    margin: 0;
    font-size: 0.8rem;
    line-height: 1.3;
}

/* ============================================
   MODALS - GLASSMORPHISM
   ============================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: rgba(15, 13, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 20px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.close-modal:hover {
    color: var(--text-primary);
}

/* ============================================
   ACHIEVEMENTS
   ============================================ */
.achievements-progress {
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--accent-gold);
}

.achievements-list {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
}

.achievement-item {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px);
    padding: 1rem;
    border-radius: 12px;
    border-left: 4px solid;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.achievement-item.unlocked {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.1);
}

.achievement-item.locked {
    border-color: var(--text-muted);
    opacity: 0.6;
}

.achievement-icon-large {
    font-size: 2.5rem;
}

.achievement-info h3 {
    margin: 0 0 0.3rem 0;
    color: var(--text-primary);
}

.achievement-info p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.achievement-reward {
    margin-left: auto;
    color: var(--accent-gold);
    font-weight: bold;
    font-family: var(--font-mono);
}

/* Achievement Notification */
.achievement-notification {
    position: fixed;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 13, 26, 0.95);
    backdrop-filter: blur(20px);
    border: 2px solid var(--accent-gold);
    border-radius: 16px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 3000;
    box-shadow: 0 10px 30px rgba(245, 158, 11, 0.3);
    transition: top 0.5s ease-out;
    max-width: 400px;
}

.achievement-notification.show {
    top: 20px;
}

.achievement-notification .achievement-icon {
    font-size: 3rem;
}

.achievement-content {
    flex: 1;
}

.achievement-title {
    color: var(--accent-gold);
    font-weight: bold;
    margin-bottom: 0.3rem;
}

.achievement-name {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

.achievement-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   LEADERBOARD
   ============================================ */
.leaderboard {
    background: rgba(0, 0, 0, 0.3);
    padding: 1rem;
    border-radius: 12px;
}

.leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.7rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.leaderboard-item:last-child {
    border-bottom: none;
}

.leaderboard-rank {
    font-weight: bold;
    color: var(--accent-gold);
    min-width: 30px;
    font-family: var(--font-mono);
}

.leaderboard-name {
    flex: 1;
    margin: 0 1rem;
}

.leaderboard-balance {
    color: var(--accent-gold);
    font-weight: bold;
    font-family: var(--font-mono);
}

/* ============================================
   TEMPORARY MESSAGE
   ============================================ */
.temp-message {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(124, 58, 237, 0.95);
    backdrop-filter: blur(12px);
    color: white;
    padding: 1rem 2rem;
    border-radius: 12px;
    z-index: 3000;
    transition: bottom 0.3s ease-out;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.5);
}

.temp-message.show {
    bottom: 20px;
}

/* ============================================
   GAME OVERLAYS
   ============================================ */
.game-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-radius: 8px;
    color: var(--text-primary);
}

.game-overlay h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.game-overlay p {
    font-size: 1.2rem;
    text-align: center;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes vibrate {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-2px); }
    75% { transform: translateX(2px); }
}

.vibrating {
    animation: vibrate 0.1s linear 3;
}

/* Loading state */
.loading {
    opacity: 0.5;
    pointer-events: none;
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */
.modal-content::-webkit-scrollbar {
    width: 8px;
}

.modal-content::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

.modal-content::-webkit-scrollbar-thumb {
    background: rgba(124, 58, 237, 0.5);
    border-radius: 4px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: rgba(124, 58, 237, 0.7);
}

/* ============================================
   PWA MODE
   ============================================ */
.pwa-mode .game-container {
    margin-top: env(safe-area-inset-top);
    margin-bottom: env(safe-area-inset-bottom);
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
}

/* ============================================
   MOBILE RESPONSIVE
   ============================================ */
@media (max-width: 767px) {
    body {
        padding: 0.5rem;
        /* Prevent content from sliding under iOS notch / home indicator */
        padding-left: max(0.5rem, env(safe-area-inset-left));
        padding-right: max(0.5rem, env(safe-area-inset-right));
    }
    
    .game-container {
        padding: 12px;
    }
    
    .panel {
        padding: 16px;
    }
    
    .modal-content {
        padding: 1.5rem;
        width: 95%;
    }
    
    .achievement-notification {
        max-width: 90%;
        padding: 1rem;
    }
}

@media (min-width: 768px) and (max-width: 1024px) {
    #tetris-canvas {
        width: 300px;
        height: 600px;
    }
}