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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.hub-container {
    max-width: 1200px;
    margin: 0 auto;
}

.hub-header {
    text-align: center;
    color: white;
    padding: 40px 20px;
    margin-bottom: 40px;
}

.hub-header h1 {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 15px;
    text-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.hub-header p {
    font-size: 1.3rem;
    opacity: 0.95;
}

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
    padding: 0 20px;
    margin-bottom: 60px;
}

.game-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.4s ease;
    cursor: pointer;
}

.game-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

.game-card.coming-soon {
    opacity: 0.7;
}

.game-card.coming-soon:hover {
    transform: translateY(-5px);
}

.game-card-inner {
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.game-icon {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: 25px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, #f0f0f0 0%, #e0e0e0 100%);
}

/* 공 피하기 게임 아이콘 */
.game-icon.ball-game {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    animation: rotate 20s linear infinite;
}

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

.icon-circle {
    position: absolute;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.icon-circle.player-color {
    width: 40px;
    height: 40px;
    background: white;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.icon-circle.enemy-color {
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    top: 20%;
    right: 20%;
}

.icon-circle.collectible-color {
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    bottom: 20%;
    left: 20%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.3);
    }
}

/* 테트리스 게임 아이콘 */
.game-icon.tetris-game {
    background: linear-gradient(135deg, #8a2be2 0%, #4b0082 100%);
    animation: tetrisPulse 3s ease-in-out infinite;
}

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

.tetris-blocks {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.tetris-block {
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 2px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.tetris-block.block-1 {
    background: #00f5ff;
    top: 20%;
    left: 35%;
    animation: tetrisFloat1 4s ease-in-out infinite;
}

.tetris-block.block-2 {
    background: #ffff00;
    top: 40%;
    right: 25%;
    animation: tetrisFloat2 4s ease-in-out infinite 1s;
}

.tetris-block.block-3 {
    background: #00ff00;
    bottom: 35%;
    left: 25%;
    animation: tetrisFloat3 4s ease-in-out infinite 2s;
}

.tetris-block.block-4 {
    background: #ff0000;
    bottom: 20%;
    right: 35%;
    animation: tetrisFloat4 4s ease-in-out infinite 3s;
}

@keyframes tetrisFloat1 {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-8px) rotate(90deg); }
}

@keyframes tetrisFloat2 {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(8px) rotate(-90deg); }
}

@keyframes tetrisFloat3 {
    0%, 100% { transform: translateX(0) rotate(0deg); }
    50% { transform: translateX(-8px) rotate(180deg); }
}

@keyframes tetrisFloat4 {
    0%, 100% { transform: translateX(0) rotate(0deg); }
    50% { transform: translateX(8px) rotate(-180deg); }
}

/* 사다리 게임 아이콘 */
.game-icon.ladder-game {
    background: linear-gradient(135deg, #4ecdc4 0%, #009688 100%);
    animation: ladderGlow 2.5s ease-in-out infinite;
}

@keyframes ladderGlow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(78, 205, 196, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(78, 205, 196, 0.6);
    }
}

.ladder-icon {
    position: relative;
    width: 80%;
    height: 80%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ladder-line {
    background: white;
    border-radius: 2px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.ladder-line.vertical {
    width: 4px;
    height: 70%;
    animation: ladderBounce 3s ease-in-out infinite;
}

.ladder-line.vertical:nth-child(2) {
    animation-delay: 0.5s;
}

.ladder-line.vertical:nth-child(3) {
    animation-delay: 1s;
}

.ladder-line.horizontal {
    position: absolute;
    width: 50%;
    height: 3px;
    left: 25%;
    animation: ladderSlide 2s ease-in-out infinite;
}

.ladder-line.horizontal:nth-child(4) {
    top: 30%;
}

.ladder-line.horizontal:nth-child(5) {
    bottom: 30%;
    animation-delay: 1s;
}

@keyframes ladderBounce {
    0%, 100% {
        transform: scaleY(1);
    }
    50% {
        transform: scaleY(1.1);
    }
}

@keyframes ladderSlide {
    0%, 100% {
        opacity: 1;
        transform: scaleX(1);
    }
    50% {
        opacity: 0.7;
        transform: scaleX(1.2);
    }
}

/* 준비 중 게임 아이콘 */
.game-icon.placeholder-game {
    background: linear-gradient(135deg, #a8a8a8 0%, #888888 100%);
}

.placeholder-text {
    font-size: 4rem;
    color: white;
    font-weight: bold;
}

.game-card h2 {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: #333;
}

.game-description {
    font-size: 1rem;
    color: #666;
    margin-bottom: 20px;
    line-height: 1.6;
    min-height: 50px;
}

.game-stats {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    flex-wrap: wrap;
    justify-content: center;
}

.stat {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.game-card.coming-soon .stat {
    background: linear-gradient(135deg, #a8a8a8 0%, #888888 100%);
}

.play-btn {
    display: inline-block;
    padding: 14px 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.play-btn:hover {
    background: linear-gradient(135deg, #5568d3 0%, #653a8b 100%);
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.play-btn.disabled {
    background: linear-gradient(135deg, #a8a8a8 0%, #888888 100%);
    cursor: not-allowed;
}

.play-btn.disabled:hover {
    transform: none;
    box-shadow: none;
}

.hub-footer {
    text-align: center;
    color: white;
    padding: 30px 20px;
    opacity: 0.9;
}

.hub-footer p {
    font-size: 0.95rem;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    .hub-header h1 {
        font-size: 2.5rem;
    }

    .hub-header p {
        font-size: 1.1rem;
    }

    .games-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .game-card h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hub-header h1 {
        font-size: 2rem;
    }

    .hub-header p {
        font-size: 1rem;
    }

    .game-icon {
        width: 100px;
        height: 100px;
    }

    .icon-circle.player-color {
        width: 30px;
        height: 30px;
    }

    .icon-circle.enemy-color {
        width: 24px;
        height: 24px;
    }

    .icon-circle.collectible-color {
        width: 16px;
        height: 16px;
    }
}