/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: var(--border-color);
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    border: 2px solid var(--border-color);
    font-weight: 600;
    z-index: 100;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 6px;
}

/* CSS Variables for consistent theming */
:root {
    --primary-color: #fcd34d;
    --secondary-color: #365bfa;
    --text-dark: #0d1b2a;
    --text-light: #1b263b;
    --border-color: #1f2933;
    --shadow-color: #b45309;
    --bg-gradient: radial-gradient(circle at top left, #f9fafc 0%, #eef1f7 45%, #dbe2ef 100%);
    --glass-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(13, 27, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    font-family: "Poppins", "Segoe UI", system-ui, -apple-system, sans-serif;
    margin: 0;
    background: var(--bg-gradient);
    color: var(--text-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    line-height: 1.6;
}

.app-shell {
    display: flex;
    gap: 24px;
    align-items: center;
    padding: 24px;
    max-width: 1200px;
}

.game-container {
    position: relative;
    border-radius: 28px;
    overflow: hidden;
    max-width: 420px;
    width: 100%;
    aspect-ratio: 360 / 640;
    background: linear-gradient(180deg, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0.05) 100%);
    box-shadow: 0 40px 80px -30px rgba(13, 27, 42, 0.4);
    border: 2px solid var(--glass-border);
}

#board {
    position: relative;
    background-color: #87CEEB;
    cursor: pointer;
    width: 100%;
    height: 100%;
    display: block;
    border-radius: 26px;
}

.score-display {
    position: absolute;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-dark);
    font-size: 52px;
    font-weight: 800;
    text-shadow: 0 12px 25px rgba(13, 27, 42, 0.28);
    z-index: 10;
    pointer-events: none;
    user-select: none;
}

.high-score-display {
    position: absolute;
    top: 86px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--secondary-color);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: .6px;
    text-transform: uppercase;
    text-shadow: 0 10px 20px rgba(54, 91, 250, 0.25);
    z-index: 10;
    pointer-events: none;
    user-select: none;
}

.pause-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 15;
    font-size: 14px;
    padding: 12px 18px;
}

.play-btn,
.sound-btn,
.pause-btn,
.restart-btn,
.resume-btn,
#pauseHomeBtn,
#gameOverHomeBtn {
    background: var(--primary-color);
    color: var(--border-color);
    border: 4px solid var(--border-color);
    border-radius: 0;
    padding: 14px 28px;
    font-size: 18px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 0 var(--shadow-color), inset -4px -4px 0 rgba(0, 0, 0, 0.2), inset 4px 4px 0 rgba(255, 255, 255, 0.35);
    transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease;
    text-shadow: 2px 2px 0 rgba(31, 41, 51, 0.9);
    font-family: inherit;
    min-height: 44px; /* Touch target size */
    white-space: nowrap;
}

.play-btn {
    font-size: 22px;
    padding: 18px 36px;
    margin-top: 20px;
}

.sound-btn {
    margin-top: 15px;
    min-width: 64px;
    min-height: 64px;
}

.pause-btn,
.restart-btn,
.resume-btn,
#pauseHomeBtn,
#gameOverHomeBtn {
    font-size: 16px;
    padding: 12px 22px;
}

.play-btn:hover,
.sound-btn:hover,
.pause-btn:hover,
.restart-btn:hover,
.resume-btn:hover,
#pauseHomeBtn:hover,
#gameOverHomeBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 0 #b45309, inset -4px -4px 0 rgba(0, 0, 0, 0.25), inset 4px 4px 0 rgba(255, 255, 255, 0.4);
}

.play-btn:active,
.sound-btn:active,
.pause-btn:active,
.restart-btn:active,
.resume-btn:active,
#pauseHomeBtn:active,
#gameOverHomeBtn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #b45309, inset -2px -2px 0 rgba(0, 0, 0, 0.3), inset 2px 2px 0 rgba(255, 255, 255, 0.3);
}

.sound-btn.muted {
    background: #f87171;
    box-shadow: 0 6px 0 #b91c1c, inset -4px -4px 0 rgba(0, 0, 0, 0.25), inset 4px 4px 0 rgba(255, 255, 255, 0.35);
}

/* Focus styles for better accessibility */
.play-btn:focus,
.sound-btn:focus,
.pause-btn:focus,
.restart-btn:focus,
.resume-btn:focus,
#pauseHomeBtn:focus,
#gameOverHomeBtn:focus {
    outline: 3px solid var(--secondary-color);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #ffff00;
        --secondary-color: #0000ff;
        --text-dark: #000000;
        --border-color: #000000;
        --shadow-color: #000000;
    }
    
    .game-container {
        border: 3px solid var(--border-color);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .new-badge {
        animation: none;
    }
}

.game-over-screen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #0d1b2a;
    z-index: 20;
    display: none;
    padding: 36px;
    border-radius: 24px;
    min-width: 280px;
    box-shadow: 0 30px 70px -28px rgba(13, 27, 42, 0.4);
}

.game-over-screen h2 {
    font-size: 36px;
    margin: 0 0 18px 0;
    font-weight: 700;
}

.score-info {
    margin-bottom: 30px;
}

.score-info p {
    font-size: 20px;
    margin: 10px 0;
    color: var(--text-light);
    letter-spacing: 0.4px;
}

.new-badge {
    display: none;
    background: linear-gradient(45deg, #ffd700, #ffed4e);
    color: #333;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 14px;
    font-weight: bold;
    margin-left: 10px;
    animation: pulse 0.8s infinite alternate;
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.6);
}

.new-badge.show {
    display: inline-block;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    100% {
        transform: scale(1.1);
    }
}

.pause-screen,
.stop-screen,
.game-over-screen,
.start-screen {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
}

.pause-screen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: #0d1b2a;
    z-index: 25;
    display: none;
    padding: 40px;
    border-radius: 20px;
    min-width: 280px;
    box-shadow: 0 25px 60px -20px rgba(13, 27, 42, 0.3);
}

.pause-screen h2 {
    font-size: 34px;
    margin: 0 0 30px 0;
    font-weight: 700;
}

.start-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #0d1b2a;
    z-index: 30;
    padding: 32px;
    gap: 12px;
}

.start-screen h1 {
    font-size: 44px;
    margin: 0 0 12px 0;
    letter-spacing: 1.2px;
    text-transform: uppercase;
}

.info-panel {
    width: 100%;
    max-width: 420px;
    background: var(--glass-bg);
    border-radius: 24px;
    padding: 32px clamp(24px, 6vw, 48px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 32px 80px -28px rgba(13, 27, 42, 0.35);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-panel h2 {
    font-size: 26px;
    margin: 0;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.info-panel ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.info-panel li {
    font-size: 17px;
    line-height: 1.6;
    color: var(--text-dark);
    padding: 14px 18px;
    border-radius: 14px;
    background: rgba(13, 27, 42, 0.05);
    border: 1px solid var(--glass-border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.info-panel li:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 27, 42, 0.1);
}

.particle {
    position: absolute;
    pointer-events: none;
    z-index: 15;
}

/* Leaderboard Styles */
.leaderboard-btn {
    background: var(--secondary-color);
    color: white;
    border: 3px solid var(--border-color);
    border-radius: 0;
    padding: 12px 20px;
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 0 #1e3a8a, inset -2px -2px 0 rgba(0, 0, 0, 0.2), inset 2px 2px 0 rgba(255, 255, 255, 0.2);
    transition: transform 0.12s ease, box-shadow 0.12s ease;
    font-family: inherit;
    min-height: 44px;
    white-space: nowrap;
    margin-top: 16px;
}

.leaderboard-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 #1e3a8a, inset -2px -2px 0 rgba(0, 0, 0, 0.25), inset 2px 2px 0 rgba(255, 255, 255, 0.25);
}

.leaderboard-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #1e3a8a, inset -1px -1px 0 rgba(0, 0, 0, 0.3), inset 1px 1px 0 rgba(255, 255, 255, 0.3);
}

.leaderboard-btn:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.leaderboard-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.leaderboard-content {
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: 24px;
    padding: 32px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 40px 80px -30px rgba(13, 27, 42, 0.4);
}

.leaderboard-content h2 {
    font-size: 28px;
    margin: 0 0 24px 0;
    text-align: center;
    color: var(--text-dark);
    font-weight: 700;
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.leaderboard-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: rgba(13, 27, 42, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.leaderboard-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 27, 42, 0.1);
}

.leaderboard-item.gold {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    border-color: #d4af37;
    font-weight: 700;
}

.leaderboard-item.silver {
    background: linear-gradient(135deg, #c0c0c0, #e8e8e8);
    border-color: #b8b8b8;
    font-weight: 600;
}

.leaderboard-item.bronze {
    background: linear-gradient(135deg, #cd7f32, #e4a853);
    border-color: #b87333;
    font-weight: 600;
}

.leaderboard-rank {
    font-weight: 700;
    margin-right: 12px;
    min-width: 30px;
}

.leaderboard-name {
    flex: 1;
    text-align: left;
    color: var(--text-dark);
}

.leaderboard-score {
    font-weight: 700;
    color: var(--secondary-color);
    font-size: 18px;
}

.leaderboard-date {
    font-size: 12px;
    color: var(--text-light);
    opacity: 0.7;
    margin-left: 8px;
}

.close-leaderboard-btn {
    background: var(--primary-color);
    color: var(--border-color);
    border: 3px solid var(--border-color);
    border-radius: 0;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    display: block;
    margin: 0 auto;
    font-family: inherit;
    min-height: 44px;
    box-shadow: 0 4px 0 var(--shadow-color), inset -2px -2px 0 rgba(0, 0, 0, 0.2), inset 2px 2px 0 rgba(255, 255, 255, 0.35);
    transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.close-leaderboard-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--shadow-color), inset -2px -2px 0 rgba(0, 0, 0, 0.25), inset 2px 2px 0 rgba(255, 255, 255, 0.25);
}

.close-leaderboard-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--shadow-color), inset -1px -1px 0 rgba(0, 0, 0, 0.3), inset 1px 1px 0 rgba(255, 255, 255, 0.3);
}

.close-leaderboard-btn:focus {
    outline: 3px solid var(--secondary-color);
    outline-offset: 2px;
}

/* Empty state */
.leaderboard-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-light);
    font-size: 16px;
    font-style: italic;
}

/* Mobile Responsiveness */
@media (max-width: 480px) {
    body {
        padding: 5px;
    }

    .game-container {
        max-width: 100%;
    }

    .score-display {
        font-size: clamp(28px, 8vw, 36px);
        top: 15px;
    }

    .high-score-display {
        font-size: clamp(12px, 3.5vw, 14px);
        top: clamp(45px, 12vw, 55px);
    }

    .pause-btn {
        top: 15px;
        right: 15px;
        padding: 10px 16px;
        font-size: 12px;
        border: 3px solid var(--border-color);
        box-shadow: 0 4px 0 var(--shadow-color), inset -2px -2px 0 rgba(0, 0, 0, 0.2), inset 2px 2px 0 rgba(255, 255, 255, 0.35);
        min-width: 44px;
        min-height: 44px;
    }

    .start-screen h1 {
        font-size: 32px;
    }

    .info-panel h2 {
        font-size: 22px;
    }

    .info-panel {
        margin-top: 0;
        width: 100%;
    }

    .app-shell {
        flex-direction: column;
        padding: 18px;
    }

    .info-panel li {
        font-size: 15px;
        padding: 12px 14px;
    }

    .play-btn {
        padding: 16px 32px;
        font-size: clamp(18px, 5vw, 20px);
        border: 3px solid var(--border-color);
        box-shadow: 0 5px 0 var(--shadow-color), inset -3px -3px 0 rgba(0, 0, 0, 0.2), inset 3px 3px 0 rgba(255, 255, 255, 0.35);
        min-width: 44px;
        min-height: 44px;
    }

    .sound-btn {
        padding: 12px 24px;
        font-size: clamp(16px, 4.5vw, 18px);
        min-width: 56px;
        min-height: 56px;
        border: 3px solid var(--border-color);
        box-shadow: 0 5px 0 var(--shadow-color), inset -3px -3px 0 rgba(0, 0, 0, 0.2), inset 3px 3px 0 rgba(255, 255, 255, 0.35);
    }

    .game-over-screen {
        padding: 20px;
        min-width: 250px;
    }

    .game-over-screen h2 {
        font-size: 28px;
    }

    .restart-btn,
    .resume-btn,
    #pauseHomeBtn,
    #gameOverHomeBtn {
        padding: 10px 20px;
        font-size: clamp(14px, 4vw, 16px);
        border: 3px solid var(--border-color);
        box-shadow: 0 4px 0 var(--shadow-color), inset -2px -2px 0 rgba(0, 0, 0, 0.2), inset 2px 2px 0 rgba(255, 255, 255, 0.35);
        min-width: 44px;
        min-height: 44px;
    }

    .pause-screen {
        padding: 30px;
        min-width: 250px;
    }

    .pause-screen h2 {
        font-size: 28px;
    }

    .leaderboard-btn {
        font-size: 14px;
        padding: 10px 16px;
        min-width: 44px;
        min-height: 44px;
    }

    .leaderboard-content {
        padding: 20px;
        margin: 10px;
    }

    .leaderboard-content h2 {
        font-size: 22px;
    }

    .leaderboard-item {
        padding: 12px 16px;
        font-size: 14px;
    }

    .leaderboard-score {
        font-size: 16px;
    }

    .leaderboard-date {
        display: none;
    }
}