:root {
    --primary: #e94560;
    --primary-dark: #c23152;
    --primary-light: #ff6b81;
    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;
    --info: #2196f3;
    --dark: #1a1a2e;
    --dark2: #16213e;
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #eeeeee;
    --gray-300: #e0e0e0;
    --gray-400: #bdbdbd;
    --gray-500: #9e9e9e;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;
    --white: #ffffff;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --transition: all 0.2s ease;
}

[data-theme="blue"] {
    --primary: #1a56db;
    --primary-dark: #1444ad;
    --primary-light: #3b82f6;
}
[data-theme="orange"] {
    --primary: #ea580c;
    --primary-dark: #c2410c;
    --primary-light: #f97316;
}
[data-theme="green"] {
    --primary: #059669;
    --primary-dark: #047857;
    --primary-light: #10b981;
}
[data-theme="purple"] {
    --primary: #7c3aed;
    --primary-dark: #6d28d9;
    --primary-light: #8b5cf6;
}
[data-theme="slate"] {
    --primary: #475569;
    --primary-dark: #334155;
    --primary-light: #64748b;
}
[data-theme="teal"] {
    --primary: #0d9488;
    --primary-dark: #0f766e;
    --primary-light: #14b8a6;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: var(--gray-100);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

.header {
    background: linear-gradient(135deg, var(--dark), var(--dark2));
    color: var(--white);
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-logo {
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--white);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.header-nav a {
    color: rgba(255,255,255,0.75);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.header-nav a:hover,
.header-nav a.active {
    color: var(--white);
    background: rgba(255,255,255,0.1);
}

.header-user {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: rgba(255,255,255,0.85);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1.4;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
}
.btn-primary:hover {
    box-shadow: 0 4px 12px rgba(233,69,96,0.4);
    transform: translateY(-1px);
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-block { width: 100%; }

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 6px;
}

.form-group label .required {
    color: var(--primary);
    margin-left: 2px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: var(--font-sans);
    transition: var(--transition);
    outline: none;
    background: var(--white);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(233,69,96,0.1);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23757575' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

.card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-200);
    font-size: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-body { padding: 20px; }

.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

table th {
    background: var(--gray-50);
    padding: 12px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-600);
    border-bottom: 2px solid var(--gray-200);
    white-space: nowrap;
}

table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--gray-200);
    vertical-align: middle;
}

table tr:hover td {
    background: var(--gray-50);
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
}

.badge-pending { background: #fff3e0; color: #e65100; }
.badge-confirmed { background: #e3f2fd; color: #1565c0; }
.badge-shipped { background: #e8f5e9; color: #2e7d32; }
.badge-completed { background: #f3e5f5; color: #7b1fa2; }
.badge-cancelled { background: var(--gray-200); color: var(--gray-600); }
.badge-success { background: #e8f5e9; color: #2e7d32; }
.badge-danger { background: #ffebee; color: #c62828; }

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 20px 0;
}

.pagination a, .pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
    transition: var(--transition);
}

.pagination a:hover { border-color: var(--primary); color: var(--primary); }
.pagination span.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

.pagination span.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.toast {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 14px 24px;
    border-radius: var(--radius-sm);
    color: var(--white);
    font-size: 14px;
    font-weight: 500;
    z-index: 9999;
    transform: translateX(120%);
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-lg);
    max-width: 360px;
}

.toast.show { transform: translateX(0); }
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-warning { background: var(--warning); }
.toast-info { background: var(--info); }

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--gray-300);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}

.empty-state .icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state p {
    font-size: 16px;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 700;
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--gray-100);
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.modal-close:hover { background: var(--gray-200); }

.modal-body { padding: 24px; }

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.stat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--white);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.stat-card .label {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.stat-card .value {
    font-size: 28px;
    font-weight: 800;
    color: var(--dark);
}

.stat-card .value.text-primary { color: var(--primary); }
.stat-card .value.text-success { color: var(--success); }
.stat-card .value.text-warning { color: var(--warning); }
.stat-card .value.text-info { color: var(--info); }

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
    align-items: flex-end;
}

.filter-bar .form-group {
    margin-bottom: 0;
    min-width: 140px;
}

.filter-bar .form-control {
    padding: 8px 12px;
    font-size: 13px;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.product-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.product-card .product-image {
    width: 100%;
    aspect-ratio: 1;
    background: var(--gray-200);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-card .product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-card .product-info {
    padding: 14px;
}

.product-card .product-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 6px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.product-card .product-price {
    font-size: 18px;
    font-weight: 800;
    color: var(--primary);
}

.product-card .product-price small {
    font-size: 12px;
    font-weight: 400;
    color: var(--gray-500);
}

.product-card .product-stock {
    font-size: 12px;
    color: var(--gray-500);
    margin-top: 4px;
}

.order-status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.order-status .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.order-status .dot.pending { background: var(--warning); }
.order-status .dot.confirmed { background: var(--info); }
.order-status .dot.shipped { background: var(--success); }
.order-status .dot.completed { background: #7b1fa2; }
.order-status .dot.cancelled { background: var(--gray-400); }

.tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 20px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding-bottom: 4px;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tabs a {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-500);
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    transition: var(--transition);
    text-decoration: none;
    flex-shrink: 0;
}

.tabs a:hover {
    color: var(--primary);
    background: var(--white);
    border-color: var(--primary);
}

.tabs a.active {
    color: var(--white);
    background: var(--primary);
    border-color: var(--primary);
}

.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.6);
    text-align: center;
    padding: 20px;
    font-size: 13px;
    margin-top: 40px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 24px;
    cursor: pointer;
    padding: 4px;
}

.skeleton {
    background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}