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

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.page {
    display: none;
    min-height: 100vh;
    padding: 20px;
}

.page.active {
    display: block;
}

/* 认证页面 */
.auth-container {
    max-width: 400px;
    margin: 100px auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.auth-container h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #667eea;
}

.auth-tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 2px solid #eee;
}

.tab-btn {
    flex: 1;
    padding: 10px;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 16px;
    color: #666;
}

.tab-btn.active {
    color: #667eea;
    border-bottom: 2px solid #667eea;
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.auth-form input {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 14px;
}

.auth-form button {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
}

.auth-form button:hover {
    background: #5568d3;
}

/* 游戏页面 */
.header {
    background: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    color: #667eea;
}

.user-info {
    display: flex;
    gap: 20px;
    align-items: center;
}

.user-info button {
    padding: 8px 16px;
    background: #ff6b6b;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.game-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.game-item {
    background: white;
    padding: 30px;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.3s;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.game-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.game-item h2 {
    color: #667eea;
    margin-bottom: 10px;
}

.game-item p {
    color: #666;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: white;
    padding: 30px;
    border-radius: 10px;
    max-width: 500px;
    width: 90%;
    position: relative;
}

.close {
    position: absolute;
    right: 15px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    color: #666;
}

.close:hover {
    color: #000;
}

.account-info {
    margin: 20px 0;
    padding: 15px;
    background: #f5f5f5;
    border-radius: 5px;
}

.account-info p {
    margin: 10px 0;
    font-size: 16px;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.modal-buttons button {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    color: white;
}

.btn-left {
    background: #667eea;
}

.btn-right {
    background: #51cf66;
}

.modal-buttons button:hover {
    opacity: 0.9;
}