:root {
    --primary: #8B7355;
    --primary-light: #A0896C;
    --primary-dark: #6B5344;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --bg: #FAFAF8;
    --sidebar-bg: #FFFFFF;
    --card-bg: #FFFFFF;
    --text-primary: #2C2C2C;
    --text-secondary: #666666;
    --text-muted: #999999;
    --border-color: #E8E4DE;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --transition: 0.25s ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;
    background-color: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.login-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 36px;
}

.login-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    transition: all var(--transition);
    background: var(--card-bg);
}

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

.login-btn {
    width: 100%;
    padding: 15px 24px;
    font-size: 16px;
    font-weight: 600;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

.login-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.login-error {
    color: var(--danger);
    font-size: 14px;
    margin-bottom: 16px;
    padding: 12px;
    background: rgba(239, 68, 68, 0.08);
    border-radius: var(--radius-sm);
}

.admin-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-header {
    padding: 0 8px;
    margin-bottom: 32px;
}

.sidebar-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.sidebar-subtitle {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.sidebar-nav {
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.nav-item:hover {
    background: rgba(139, 115, 85, 0.08);
    color: var(--primary);
}

.nav-item.active {
    background: rgba(139, 115, 85, 0.12);
    color: var(--primary-dark);
    font-weight: 600;
}

.nav-item svg {
    width: 20px;
    height: 20px;
}

.sidebar-footer {
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.sidebar-footer-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-secondary);
    background: none;
    border: none;
    width: 100%;
    font-size: 14px;
}

.sidebar-footer-btn:hover {
    background: rgba(239, 68, 68, 0.08);
    color: var(--danger);
}

.sidebar-footer-btn svg {
    width: 20px;
    height: 20px;
}

.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 32px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.page-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
}

.page-actions {
    display: flex;
    gap: 12px;
}

.btn {
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

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

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.content-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

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

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: rgba(139, 115, 85, 0.06);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.chart-container {
    position: relative;
    height: 300px;
    margin-bottom: 24px;
}

.chart-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.switch-container {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: rgba(139, 115, 85, 0.06);
    border-radius: var(--radius-md);
}

.switch-label {
    font-weight: 500;
    color: var(--text-primary);
}

.switch-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.mock-btn-group {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
}

.mock-desc {
    font-size: 13px;
    color: var(--text-muted);
}

.switch {
    position: relative;
    width: 52px;
    height: 28px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #d1d5db;
    transition: 0.3s;
    border-radius: 28px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

input:checked + .slider {
    background: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

.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-color);
}

.data-table th {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    background: rgba(0, 0, 0, 0.02);
}

.data-table td {
    font-size: 14px;
    color: var(--text-primary);
}

.data-table tbody tr:hover {
    background: rgba(139, 115, 85, 0.04);
}

.feedback-list {
    max-height: 500px;
    overflow-y: auto;
}

.feedback-item {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition);
}

.feedback-item:hover {
    background: rgba(139, 115, 85, 0.04);
}

.feedback-item:last-child {
    border-bottom: none;
}

.feedback-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.feedback-time {
    font-size: 12px;
    color: var(--text-muted);
}

.feedback-user {
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    background: rgba(139, 115, 85, 0.1);
    padding: 4px 10px;
    border-radius: 20px;
}

.feedback-content {
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.6;
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
}

.modal-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-align: center;
}

.modal-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    transition: all var(--transition);
    background: var(--card-bg);
}

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

.modal-btns {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
}

.hidden {
    display: none !important;
}

@media (min-width: 769px) {
    .login-card {
        max-width: 440px;
        padding: 52px 44px;
    }
    
    .modal-content {
        max-width: 440px;
    }
    
    .chart-container {
        height: 320px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 16px;
    }
    
    .sidebar-nav {
        display: flex;
        gap: 8px;
        overflow-x: auto;
        padding-bottom: 8px;
    }
    
    .nav-item {
        white-space: nowrap;
        padding: 10px 16px;
    }
    
    .sidebar-footer {
        display: none;
    }
    
    .main-content {
        margin-left: 0;
        padding: 20px;
    }
    
    .admin-layout {
        flex-direction: column;
    }
    
    .chart-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .modal-content {
        max-width: 95%;
        margin: 16px;
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 36px 28px;
    }
    
    .login-title {
        font-size: 24px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    
    .stat-card {
        padding: 20px;
    }
    
    .stat-value {
        font-size: 28px;
    }
}