/* ===== 基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg: #f8fafc;
    --bg-card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

.hidden {
    display: none !important;
}

/* ===== 按钮 ===== */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: #e2e8f0;
    color: var(--text);
}

.btn-secondary:hover {
    background: #cbd5e1;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

.btn-block {
    width: 100%;
}

/* ===== 登录界面 ===== */
.login-view {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.login-box {
    background: white;
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}

.login-box h1 {
    text-align: center;
    font-size: 32px;
    margin-bottom: 8px;
}

.login-box h2 {
    text-align: center;
    color: var(--text-muted);
    font-size: 16px;
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.form-actions .btn {
    flex: 1;
}

.error {
    color: var(--danger);
    text-align: center;
    margin-top: 12px;
    font-size: 14px;
}

/* ===== 管理界面 ===== */
.admin-view {
    min-height: 100vh;
}

/* Header */
.admin-header {
    background: white;
    padding: 16px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left h1 {
    font-size: 20px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-right span {
    color: var(--text-muted);
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    padding: 24px 32px;
}

.stat-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: var(--shadow);
}

.stat-icon {
    font-size: 40px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    color: var(--text-muted);
    font-size: 14px;
}

/* 标签页 */
.tabs {
    display: flex;
    gap: 4px;
    padding: 0 32px;
    background: white;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    padding: 16px 24px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.tab-btn:hover {
    color: var(--primary);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Tab 内容 */
.tab-content {
    display: none;
    padding: 24px 32px;
}

.tab-content.active {
    display: block;
}

.tab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.tab-header h3 {
    font-size: 18px;
}

.tab-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.tab-actions input {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
}

/* 表格 */
.table-container {
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: #f8fafc;
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    color: var(--text-muted);
}

.data-table tbody tr:hover {
    background: #f8fafc;
}

.data-table .loading {
    text-align: center;
    color: var(--text-muted);
    padding: 40px;
}

.data-table .actions {
    display: flex;
    gap: 8px;
}

/* 在线列表 */
.online-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.online-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 16px;
}

.online-card .avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--success));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.online-card .info {
    flex: 1;
}

.online-card .nickname {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 4px;
}

.online-card .meta {
    font-size: 13px;
    color: var(--text-muted);
}

.online-card .status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--success);
    font-size: 13px;
}

.online-card .status::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
}

/* 房间列表 */
.rooms-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.room-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
}

.room-card .room-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.room-card .room-code {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 2px;
}

.room-card .game-type {
    background: #e2e8f0;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
}

.room-card .players {
    margin-bottom: 12px;
}

.room-card .player-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    font-size: 14px;
}

.room-card .player-item.owner::before {
    content: '👑';
    margin-right: 4px;
}

.room-card .player-item.offline {
    color: var(--text-muted);
}

.room-card .player-item.offline::after {
    content: '⚫';
    margin-left: 4px;
    font-size: 10px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: white;
    padding: 32px;
    border-radius: 16px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-content h3 {
    margin-bottom: 20px;
    font-size: 18px;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: white;
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    z-index: 2000;
    animation: slideIn 0.3s ease;
}

.toast.error {
    border-left: 4px solid var(--danger);
}

.toast.success {
    border-left: 4px solid var(--success);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 响应式 */
@media (max-width: 768px) {
    .admin-header {
        padding: 12px 16px;
        flex-direction: column;
        gap: 12px;
    }
    
    .stats-grid {
        padding: 16px;
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tabs {
        padding: 0 16px;
        overflow-x: auto;
    }
    
    .tab-content {
        padding: 16px;
    }
    
    .tab-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
    
    .tab-actions {
        width: 100%;
        flex-wrap: wrap;
    }
    
    .data-table {
        font-size: 12px;
    }
    
    .data-table th,
    .data-table td {
        padding: 10px 8px;
    }
}