:root {
    --bg-color: #f8f9fa;
    --text-color: #333;
    --panel-bg: #ffffff;
    --score-text: #2e7d32;
    --timer-bg: #f1f3f4;
    --timer-text: #202124;
    --timer-border: #e8eaed;
    --canvas-border: #fff;
    --shadow-color: rgba(0,0,0,0.1);
    --header-bg: #2e7d32;
    --header-text: #fff;
    --link-color: #2e7d32;
    --footer-bg: #f1f3f4;
    --footer-text: #666;
    --card-bg: #fff;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --panel-bg: #1e1e1e;
    --score-text: #81c784;
    --timer-bg: #333;
    --timer-text: #fff;
    --timer-border: #444;
    --canvas-border: #333;
    --shadow-color: rgba(0,0,0,0.5);
    --header-bg: #1b5e20;
    --header-text: #e0e0e0;
    --link-color: #81c784;
    --footer-bg: #1e1e1e;
    --footer-text: #aaa;
    --card-bg: #1e1e1e;
}

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

body {
    background-color: var(--bg-color);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Header */
.site-header {
    background-color: var(--header-bg);
    color: var(--header-text);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-title {
    font-size: 1.8rem;
    font-weight: 900;
    letter-spacing: -1px;
}

.site-nav ul {
    display: flex;
    list-style: none;
    gap: 24px;
}

.site-nav a {
    color: inherit;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: opacity 0.2s;
}

.site-nav a:hover {
    opacity: 0.8;
}

#themeToggle {
    background: rgba(255,255,255,0.15);
    border: none;
    color: inherit;
    font-size: 1.2rem;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

#themeToggle:hover {
    background: rgba(255,255,255,0.25);
}

/* Main Layout */
.site-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Game View */
.game-view {
    display: flex;
    justify-content: center;
    margin-bottom: 80px;
}

.game-wrapper {
    width: 600px;
    max-width: 100%;
    position: relative;
}

.canvas-container {
    position: relative;
    display: flex;
    flex-direction: column;
}

canvas {
    width: 100%;
    height: auto;
    border: 4px solid var(--canvas-border);
    background-color: #fff;
    box-shadow: 0 20px 40px var(--shadow-color);
    border-radius: 0 0 24px 24px;
    touch-action: none; /* Prevent scrolling/zooming while playing */
}

#scorePanel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--panel-bg);
    padding: 20px 40px;
    border-radius: 24px 24px 0 0;
    box-shadow: 0 -10px 20px var(--shadow-color);
    transition: background-color 0.3s;
}

.score-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 2rem;
    font-weight: 800;
    color: var(--score-text);
}

#timerDisplay {
    font-size: 1.8rem;
    font-family: 'Courier New', Courier, monospace;
    background: var(--timer-bg);
    color: var(--timer-text);
    padding: 6px 24px;
    border-radius: 32px;
    border: 2px solid var(--timer-border);
    font-weight: bold;
}

/* Content View */
.content-view {
    padding-top: 40px;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--score-text);
    margin-bottom: 8px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--footer-text);
    font-weight: 500;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.content-card {
    background: var(--card-bg);
    padding: 32px;
    border-radius: 24px;
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: transform 0.3s, background-color 0.3s;
}

.content-card:hover {
    transform: translateY(-5px);
}

.content-card h3 {
    color: var(--score-text);
    font-size: 1.5rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-card p {
    margin-bottom: 16px;
    font-size: 1.05rem;
    color: var(--text-color);
}

.content-card ul {
    list-style: none;
    margin-top: 15px;
}

.content-card li {
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
}

.content-card li::before {
    content: "•";
    color: var(--score-text);
    font-weight: bold;
    font-size: 1.4rem;
    position: absolute;
    left: 0;
    top: -2px;
}

.content-card strong {
    color: var(--score-text);
}

/* Restart Button */
#restartButton {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px 50px;
    font-size: 1.6rem;
    font-weight: 800;
    color: white;
    background: linear-gradient(135deg, #4caf50 0%, #2e7d32 100%);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    box-shadow: 0 15px 30px rgba(46, 125, 50, 0.4);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 100;
}

#restartButton:hover {
    box-shadow: 0 20px 40px rgba(46, 125, 50, 0.5);
    transform: translate(-50%, -50%) scale(1.1);
}

/* Footer */
.site-footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 60px 0;
    margin-top: 100px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.footer-nav ul {
    display: flex;
    list-style: none;
    gap: 32px;
}

.footer-nav a {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
}

/* Responsive */
@media (max-width: 900px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .site-nav ul {
        gap: 16px;
        font-size: 0.9rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
}

@media (max-width: 650px) {
    .score-item {
        font-size: 1.5rem;
    }
    
    #timerDisplay {
        font-size: 1.4rem;
        padding: 4px 16px;
    }
    
    #scorePanel {
        padding: 15px 24px;
    }
    
    .content-card {
        padding: 24px;
    }
}