:root {
    --primary: #FFD700; /* Gold */
    --secondary: #3498db; /* Blue */
    --bg: #0a0a0a;
    --card: #161616;
    --card-hover: #1c1c1c;
    --text: #ffffff;
    --text-muted: #888888;
    --black: #111111;
    --white: #f5f5f5;
    --shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Outfit', sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-main);
    overflow: hidden;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-container {
    width: 100%;
    max-width: 1200px;
    height: 100vh;
    position: relative;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.view {
    display: none;
    flex-direction: column;
    height: 100%;
    transition: opacity 0.5s ease;
    opacity: 0;
}

.view.active {
    display: flex;
    opacity: 1;
}

/* Home Screen */
#home-screen {
    justify-content: center;
    align-items: center;
    gap: 40px;
}

.hero-section {
    text-align: center;
}

.glow-text {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: 0.5rem;
    background: linear-gradient(135deg, #fff, #ffd700);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 10px rgba(255, 215, 0, 0.5));
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    letter-spacing: 0.3rem;
}

.game-selection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    width: 100%;
    max-width: 900px;
}

.selection-card {
    background: var(--card);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.selection-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), transparent);
    opacity: 0;
    transition: 0.3s;
}

.selection-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary);
    background: var(--card-hover);
    box-shadow: 0 10px 40px rgba(255, 215, 0, 0.1);
}

.selection-card:hover::before {
    opacity: 1;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.selection-card h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.selection-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.difficulty-options {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 2rem;
}

.level-badge {
    padding: 6px 14px;
    font-size: 0.8rem;
    border-radius: 20px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    transition: 0.2s;
}

.level-badge.active {
    background: var(--primary);
    color: var(--black);
    font-weight: 600;
}

.btn {
    width: 100%;
    padding: 16px;
    border-radius: 12px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
}

.btn-primary { background: var(--primary); color: var(--black); }
.btn-secondary { background: var(--secondary); color: white; }

/* Game Screen */
#game-screen {
    gap: 20px;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
}

.btn-back {
    background: transparent;
    border: none;
    color: var(--text);
    cursor: pointer;
    font-weight: 600;
}

.game-info {
    font-weight: 800;
    font-size: 1.4rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.game-info span:last-child {
    font-size: 0.8rem;
    color: var(--primary);
}

.turn-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(0,0,0,0.5);
    padding: 8px 16px;
    border-radius: 30px;
    border: 1px solid var(--glass-border);
}

.stone-mini {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0,0,0,0.5);
}

.stone-mini.black { background: radial-gradient(circle at 30% 30%, #444, #111); }
.stone-mini.white { background: radial-gradient(circle at 30% 30%, #fff, #ddd); }

.board-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

#game-board-canvas {
    max-width: 100%;
    max-height: 100%;
    background: radial-gradient(circle at center, #c19a6b, #8b4513); /* Wood gradient */
    border-radius: 8px;
    box-shadow: 0 10px 60px rgba(0,0,0,0.8), inset 0 0 100px rgba(0,0,0,0.2);
    cursor: pointer;
}

.game-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: var(--glass-bg);
    border-radius: 16px;
}

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

.stat-item {
    font-size: 1.2rem;
    font-weight: 600;
}

.stat-item .label { color: var(--text-muted); font-size: 0.9rem; }

.controls {
    display: flex;
    gap: 10px;
}

.btn-control {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.2s;
}

.btn-control:hover { background: rgba(255,255,255,0.1); }
.btn-control.highlight { border-color: var(--primary); color: var(--primary); }

/* Responsive adjustments */
@media (max-width: 768px) {
    .glow-text { font-size: 2.5rem; }
    .game-selection-grid { grid-template-columns: 1fr; }
    .game-header { flex-direction: column; gap: 10px; }
}