/* Flappy Bird Ultimate - Main Stylesheet */

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

body {
    font-family: 'Arial', sans-serif;
    background: linear-gradient(135deg, #0f0f1e 0%, #1a1a3e 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: #fff;
    padding: 10px;
    overflow: hidden;
}

.game-container {
    position: relative;
    width: 100%;
    max-width: 480px;
    background: linear-gradient(180deg, #87CEEB 0%, #E0F6FF 100%);
    overflow: hidden;
    border-radius: 15px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
    aspect-ratio: 9 / 16;
}

#gameCanvas {
    display: block;
    background: linear-gradient(180deg, #87CEEB 0%, #E0F6FF 100%);
    width: 100%;
    height: 100%;
    touch-action: none;
    image-rendering: crisp-edges;
    image-rendering: pixelated;
}

/* Starting Animation */
.starting-animation {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 200;
    animation: fadeOut 2s ease-in-out forwards;
}

.animation-content {
    text-align: center;
    animation: popInScale 0.8s cubic-bezier(0.36, 0, 0.66, 1) forwards;
}

.bird-logo {
    font-size: 80px;
    margin-bottom: 20px;
    animation: bounce 1s ease-in-out infinite;
}

.animation-content h2 {
    font-size: 48px;
    font-weight: bold;
    margin: 10px 0;
    letter-spacing: 2px;
}

.animation-content p {
    font-size: 24px;
    letter-spacing: 3px;
    color: rgba(255,255,255,0.9);
}

@keyframes fadeOut {
    0% { opacity: 1; }
    70% { opacity: 1; }
    100% { opacity: 0; pointer-events: none; }
}

@keyframes popInScale {
    0% {
        transform: scale(0.3);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

/* UI Overlay */
.ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 15px;
    z-index: 10;
}

.ui-top-section {
    display: flex;
    justify-content: center;
}

.ui-middle-section {
    display: flex;
    justify-content: center;
    flex: 1;
    align-items: center;
}

.ui-bottom-section {
    display: flex;
    justify-content: center;
}

.score-display {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    width: 100%;
    max-width: 300px;
}

.score-item {
    background: rgba(0,0,0,0.35);
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    border: 2px solid rgba(255,255,255,0.2);
    min-height: 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    transition: all 0.3s ease;
}

.score-label {
    font-size: 11px;
    color: rgba(255,255,255,0.8);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 5px;
}

.score-value {
    font-size: 24px;
    font-weight: bold;
    color: #FFD700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.score-value.combo-value {
    color: #FF6B6B;
    font-size: 20px;
}

.score-value.high-score {
    color: #4ECDC4;
}

.score-value.coin-value {
    color: #FFD700;
    font-size: 20px;
}

.high-score-display {
    background: rgba(0,0,0,0.35);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
    color: #4ECDC4;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    letter-spacing: 0.5px;
}

.power-ups-display {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    max-width: 280px;
}

.power-up-indicator {
    background: rgba(255,215,0,0.8);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
    color: #000;
    text-shadow: none;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    white-space: nowrap;
    animation: shimmer 2s ease-in-out infinite !important;
}

.difficulty-indicator {
    background: rgba(100,150,255,0.4);
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
    border: 2px solid rgba(100,150,255,0.6);
}

/* Menu Overlay */
.menu-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15,15,30,0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 50;
    backdrop-filter: blur(8px);
    pointer-events: all;
    overflow-y: auto;
    padding: 20px;
}

#gameOverScreen {
    animation: fadeInGameOver 0.5s ease-out !important;
}

@keyframes fadeInGameOver {
    from {
        opacity: 0;
        background: rgba(15,15,30,0);
    }
    to {
        opacity: 1;
        background: rgba(15,15,30,0.95);
    }
}

.menu-overlay::-webkit-scrollbar {
    width: 6px;
}

.menu-overlay::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.1);
}

.menu-overlay::-webkit-scrollbar-thumb {
    background: rgba(255,215,0,0.5);
    border-radius: 3px;
}

.menu-content {
    text-align: center;
    width: 100%;
    max-width: 420px;
    animation: slideInUp 0.6s ease-out 0.2s both;
}

.menu-header {
    margin-bottom: 10px;
    animation: fadeIn 0.8s ease-out 0.3s both;
}

.menu-title {
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 5px;
    color: #FFD700;
    letter-spacing: 1px;
    text-transform: uppercase;
    animation: bounce 0.8s ease-in-out 0.5s 1;
}

.menu-subtitle {
    font-size: 20px;
    color: #4ECDC4;
    margin-bottom: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
    animation: glow 1.5s ease-in-out 0.6s infinite;
}

.menu-tagline {
    font-size: 14px;
    color: #aaa;
    margin-bottom: 30px;
    letter-spacing: 0.5px;
    animation: fadeIn 0.8s ease-out 0.7s both;
}

/* Menu Player Rank */
.menu-player-rank {
    display: inline-block;
    background: rgba(255, 215, 0, 0.15);
    padding: 8px 16px;
    border-radius: 20px;
    margin-bottom: 20px;
    border: 2px solid rgba(255, 215, 0, 0.3);
    font-weight: bold;
    animation: slideInDown 0.6s ease-out 0.8s both;
    transition: all 0.3s ease;
}

.menu-player-rank:hover {
    background: rgba(255, 215, 0, 0.25);
    border-color: rgba(255, 215, 0, 0.6);
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
}

.rank-icon-small {
    font-size: 18px;
    margin-right: 8px;
}

.rank-text-small {
    color: #FFD700;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 0.5px;
}

/* Buttons */
.button {
    padding: 14px 28px;
    font-size: 14px;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: white;
    text-transform: uppercase;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    display: block;
    margin: 0 auto;
    letter-spacing: 1px;
}

.button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.4);
}

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

.button-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    width: 90%;
    max-width: 300px;
    margin: 12px auto;
}

.button-secondary {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    width: 90%;
    max-width: 280px;
    margin: 8px auto;
    font-size: 13px;
}

/* Character Selection */
.character-select {
    margin: 15px auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(75px, 1fr));
    gap: 10px;
    max-width: 100%;
    width: 100%;
    animation: fadeIn 0.6s ease-out 1s both;
}

.character-option {
    padding: 12px 8px;
    border: 3px solid transparent;
    border-radius: 8px;
    background: rgba(100,100,100,0.4);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 13px;
    text-align: center;
    user-select: none;
    font-weight: bold;
}

.character-option:hover {
    background: rgba(150,150,150,0.6);
    border-color: #FFD700;
    transform: scale(1.08);
}

.character-option.selected {
    border-color: #4ECDC4;
    background: rgba(78,205,196,0.2);
    box-shadow: 0 0 15px rgba(78,205,196,0.4);
}

/* Difficulty Selection */
.difficulty-select {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    justify-content: center;
    margin: 15px auto;
    width: 100%;
    max-width: 280px;
    animation: fadeIn 0.6s ease-out 1.1s both;
}

.difficulty-btn {
    padding: 12px 16px;
    background: rgba(100,100,100,0.4);
    border: 2px solid transparent;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 12px;
    font-weight: bold;
    user-select: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    animation: slideInUp 0.5s ease-out calc(1.2s + var(--index) * 0.08s) both;
}

.difficulty-btn.active {
    border-color: #FFD700;
    background: rgba(255,215,0,0.2);
    box-shadow: 0 0 12px rgba(255,215,0,0.4);
    color: #FFD700;
}

.difficulty-btn:hover {
    border-color: #FFA500;
    background: rgba(255,165,0,0.15);
    transform: translateY(-2px);
}

/* Menu Sections */
.menu-section {
    margin: 18px 0;
    animation: fadeIn 0.6s ease-out calc(0.8s + var(--delay, 0s)) both;
}

.menu-section-title {
    font-size: 13px;
    color: #FFD700;
    margin: 12px 0 10px 0;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    animation: slideInLeft 0.5s ease-out calc(0.9s + var(--delay, 0s)) both;
}

.menu-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 8px;
    margin-top: 25px;
}

.menu-options .button {
    width: 100%;
    margin: 0;
    max-width: none;
}

/* Modal Overlay */
.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.85);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 200;
    backdrop-filter: blur(5px);
    pointer-events: none;
}

.modal-overlay.active {
    display: flex;
    pointer-events: all;
}

/* Pause Menu */
.pause-menu {
    background: rgba(20,20,35,0.95);
    padding: 40px;
    border-radius: 15px;
    border: 3px solid #667eea;
    text-align: center;
    width: 90%;
    max-width: 320px;
    pointer-events: all;
}

.pause-title {
    font-size: 32px;
    margin-bottom: 25px;
    color: #FFD700;
    letter-spacing: 1px;
}

.pause-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.pause-buttons .button {
    width: 100%;
    margin: 0;
    max-width: none;
    padding: 12px 20px;
}

/* Settings Panel */
.settings-panel {
    background: rgba(20,20,35,0.96);
    padding: 30px;
    border-radius: 15px;
    border: 3px solid #667eea;
    width: 90%;
    max-width: 380px;
    max-height: 85vh;
    overflow-y: auto;
    pointer-events: all;
}

.settings-panel::-webkit-scrollbar {
    width: 6px;
}

.settings-panel::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.1);
}

.settings-panel::-webkit-scrollbar-thumb {
    background: rgba(102,126,234,0.6);
    border-radius: 3px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.panel-header h2 {
    font-size: 22px;
    color: #667eea;
    letter-spacing: 1px;
    margin: 0;
}

.close-btn {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.close-btn:hover {
    background: rgba(102,126,234,0.2);
    transform: rotate(90deg);
}

.settings-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.settings-group {
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 15px;
}

.settings-group:last-child {
    border-bottom: none;
}

.group-title {
    font-size: 12px;
    color: #FFD700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 12px;
    font-weight: bold;
}

.setting-item {
    margin: 12px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
}

.setting-label {
    font-size: 14px;
    color: #ddd;
    font-weight: 500;
}

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

.slider {
    width: 100px;
    height: 6px;
    cursor: pointer;
    accent-color: #667eea;
}

.volume-label {
    font-size: 12px;
    color: #FFD700;
    min-width: 35px;
    text-align: right;
}

.toggle-btn {
    width: 50px;
    height: 28px;
    background: #444;
    border: 2px solid #666;
    border-radius: 14px;
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
}

.toggle-btn.enabled {
    background: #4CAF50;
    border-color: #45a049;
}

.toggle-btn::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: left 0.3s ease;
}

.toggle-btn.enabled::after {
    left: 18px;
}

/* Leaderboard Panel */
.leaderboard-panel {
    background: rgba(20,20,35,0.96);
    padding: 30px;
    border-radius: 15px;
    border: 3px solid #FFD700;
    width: 90%;
    max-width: 380px;
    max-height: 85vh;
    overflow-y: auto;
    pointer-events: all;
}

.leaderboard-panel::-webkit-scrollbar {
    width: 6px;
}

.leaderboard-panel::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.1);
}

.leaderboard-panel::-webkit-scrollbar-thumb {
    background: rgba(255,215,0,0.6);
    border-radius: 3px;
}

.leaderboard-panel .panel-header h2 {
    color: #FFD700;
}

.leaderboard-panel .close-btn {
    border-color: #FFD700;
    color: #FFD700;
}

.leaderboard-panel .close-btn:hover {
    background: rgba(255,215,0,0.1);
}

.leaderboard-content {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.leaderboard-entry {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    font-size: 14px;
}

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

.leaderboard-rank {
    font-weight: bold;
    color: #FFD700;
    min-width: 35px;
    font-size: 16px;
}

.leaderboard-rank.top-1 {
    color: #FFD700;
    font-size: 18px;
}

.leaderboard-rank.top-2 {
    color: #C0C0C0;
}

.leaderboard-rank.top-3 {
    color: #CD7F32;
}

.leaderboard-score {
    color: #4ECDC4;
    font-weight: bold;
    min-width: 60px;
    text-align: right;
}

/* About Panel */
.about-panel {
    background: rgba(20,20,35,0.96);
    padding: 30px;
    border-radius: 15px;
    border: 3px solid #667eea;
    width: 90%;
    max-width: 380px;
    max-height: 85vh;
    overflow-y: auto;
    pointer-events: all;
}

/* Achievements Panel */
.achievements-panel {
    background: rgba(20,20,35,0.96);
    padding: 30px;
    border-radius: 15px;
    border: 3px solid #FFD700;
    width: 90%;
    max-width: 380px;
    max-height: 85vh;
    overflow-y: auto;
    pointer-events: all;
}

.achievements-panel::-webkit-scrollbar {
    width: 6px;
}

.achievements-panel::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.1);
}

.achievements-panel::-webkit-scrollbar-thumb {
    background: rgba(255,215,0,0.6);
    border-radius: 3px;
}

.achievements-panel .panel-header h2 {
    color: #FFD700;
}

.achievements-panel .close-btn {
    border-color: #FFD700;
    color: #FFD700;
}

.achievements-panel .close-btn:hover {
    background: rgba(255,215,0,0.1);
}

.achievements-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.about-panel::-webkit-scrollbar {
    width: 6px;
}

.about-panel::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.1);
}

.about-panel::-webkit-scrollbar-thumb {
    background: rgba(102,126,234,0.6);
    border-radius: 3px;
}

.about-panel .panel-header h2 {
    color: #667eea;
}

.about-content {
    font-size: 13px;
    line-height: 1.6;
    color: #ddd;
}

.about-section {
    margin: 15px 0;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.about-section:last-child {
    border-bottom: none;
}

.about-section h3 {
    color: #FFD700;
    font-size: 13px;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.about-section ul {
    list-style: none;
    padding-left: 0;
}

.about-section li {
    padding: 4px 0;
    padding-left: 20px;
}

/* Game Over Screen */
.game-over-content {
    max-width: 340px;
}

/* Rank Display */
.rank-display {
    margin-bottom: 20px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 2px solid #FFD700;
    text-align: center;
    animation: slideInDown 0.5s ease-out;
}

.rank-icon {
    font-size: 48px;
    margin-bottom: 10px;
    display: block;
}

.rank-name {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.rank-progress-bar {
    width: 100%;
    height: 8px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.rank-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #FFD700, #FFA500);
    transition: width 0.5s ease-out;
    border-radius: 4px;
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.game-over-title {
    font-size: 40px;
    color: #FF6B6B;
    margin-bottom: 25px;
    letter-spacing: 1px;
    text-transform: uppercase;
    animation: pulse 0.6s ease-in-out;
}

.game-over-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin: 25px 0;
    padding: 20px;
    background: rgba(255,107,107,0.1);
    border-radius: 10px;
    border: 2px solid rgba(255,107,107,0.3);
}

.stat-item {
    text-align: center;
}

.stat-label {
    font-size: 11px;
    color: rgba(255,255,255,0.7);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 28px;
    font-weight: bold;
    color: #FFD700;
}

.game-over-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.game-over-buttons .button {
    width: 90%;
    max-width: 300px;
    margin: 0 auto;
    padding: 12px 20px;
}

/* Game Over Animations */
@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Game Over Button Animations */
.game-over-buttons .button {
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.game-over-buttons .button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: left 0.3s ease;
    z-index: -1;
}

.game-over-buttons .button:hover::before {
    left: 100%;
}

.game-over-buttons .button:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 2px;
    }

    #gameCanvas {
        max-height: 95vh;
    }

    .menu-overlay {
        padding: 10px;
    }

    .menu-title {
        font-size: 32px;
    }

    .menu-subtitle {
        font-size: 18px;
    }

    .button {
        padding: 12px 20px;
        font-size: 13px;
    }

    .button-secondary {
        font-size: 12px;
        padding: 10px 16px;
    }

    .character-select {
        grid-template-columns: repeat(auto-fit, minmax(65px, 1fr));
        gap: 8px;
    }

    .pause-menu {
        padding: 30px;
        border-radius: 10px;
        width: 90vw;
        max-width: 300px;
    }

    .pause-title {
        font-size: 28px;
        margin-bottom: 20px;
    }

    .settings-panel,
    .leaderboard-panel,
    .about-panel {
        width: 95vw;
        max-width: 340px;
        padding: 20px;
    }

    .settings-group {
        padding-bottom: 12px;
    }

    .setting-item {
        margin: 10px 0;
        padding: 6px 0;
    }

    .setting-label {
        font-size: 13px;
    }

    .slider {
        width: 80px;
    }
}

@media (max-width: 480px) {
    .game-container {
        max-width: 100vw;
        border-radius: 0;
    }

    .menu-title {
        font-size: 28px;
    }

    .menu-subtitle {
        font-size: 16px;
    }

    .menu-tagline {
        font-size: 12px;
    }

    .menu-options {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .difficulty-select {
        grid-template-columns: 1fr;
    }

    .character-select {
        grid-template-columns: repeat(auto-fit, minmax(55px, 1fr));
        gap: 6px;
    }

    .button {
        padding: 10px 16px;
        font-size: 12px;
    }

    .button-secondary {
        font-size: 11px;
        padding: 8px 12px;
    }

    .score-display {
        gap: 6px;
    }

    .score-item {
        padding: 8px;
    }

    .score-label {
        font-size: 9px;
    }

    .score-value {
        font-size: 18px;
    }

    .power-up-indicator {
        font-size: 11px;
        padding: 5px 10px;
    }

    .pause-menu {
        padding: 20px;
        width: 90vw;
        max-width: 280px;
    }

    .pause-title {
        font-size: 24px;
        margin-bottom: 15px;
    }

    .settings-panel,
    .leaderboard-panel,
    .about-panel {
        width: 95vw;
        max-width: 300px;
        padding: 15px;
    }

    .panel-header {
        margin-bottom: 15px;
    }

    .panel-header h2 {
        font-size: 18px;
    }

    .close-btn {
        width: 30px;
        height: 30px;
        font-size: 16px;
    }

    .group-title {
        font-size: 11px;
        margin-bottom: 8px;
    }

    .setting-item {
        margin: 8px 0;
        padding: 4px 0;
    }

    .setting-label {
        font-size: 12px;
    }

    .slider {
        width: 60px;
    }

    .volume-label {
        font-size: 11px;
        min-width: 30px;
    }

    .leaderboard-entry {
        padding: 10px;
        font-size: 13px;
    }

    .leaderboard-rank {
        font-size: 14px;
        min-width: 30px;
    }

    .leaderboard-score {
        font-size: 13px;
        min-width: 50px;
    }

    .about-section h3 {
        font-size: 12px;
        margin-top: 10px;
        margin-bottom: 6px;
    }

    .about-content {
        font-size: 12px;
        line-height: 1.5;
    }

    .about-section li {
        padding: 3px 0;
        padding-left: 15px;
    }

    .game-over-stats {
        gap: 8px;
        padding: 15px;
        margin: 15px 0;
    }

    .stat-label {
        font-size: 10px;
    }

    .stat-value {
        font-size: 22px;
    }

    .game-over-title {
        font-size: 32px;
        margin-bottom: 20px;
    }
}

/* Enhanced animations and effects */
@keyframes shimmer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 10px rgba(102,126,234,0.5);
    }
    50% {
        box-shadow: 0 0 20px rgba(102,126,234,0.8);
    }
}

@keyframes floatUp {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-30px);
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes wave {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOutRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

/* Power-up glow effect */
.power-up-indicator {
    animation: shimmer 2s ease-in-out infinite !important;
}

/* Score item interactive effect */
.score-item {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.score-item:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(255, 215, 0, 0.4);
}

/* Difficulty button press effect */
.difficulty-btn:active {
    transform: scale(0.95);
}

/* Character option animations */
.character-option {
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.character-option.selected {
    animation: pulse 0.6s ease;
}

/* Enhanced button effects */
.button {
    position: relative;
    overflow: hidden;
}

.button::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.button:active::after {
    animation: ripple 0.6s ease-out;
}

@keyframes ripple {
    from {
        width: 0;
        height: 0;
    }
    to {
        width: 300px;
        height: 300px;
    }
}

/* Smooth transitions for modals */
.modal-overlay {
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Settings panel enhancements */
.settings-panel {
    animation: slideInUp 0.4s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}