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

:root {
    --primary: #1a56db;
    --primary-dark: #1341a8;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.5;
}

/* Layout */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header */
.header {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.header h1 {
    font-size: 1.25rem;
    color: var(--gray-900);
    font-weight: 700;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.4;
}

.btn:hover {
    opacity: 0.9;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

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

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-warning {
    background: var(--warning);
    color: #fff;
}

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

.btn-outline {
    background: transparent;
    border-color: var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover {
    background: var(--gray-50);
}

.btn-sm {
    padding: 4px 10px;
    font-size: 0.8125rem;
}

.btn-full {
    width: 100%;
}

/* Dashboard Cards */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.card {
    background: #fff;
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.card-label {
    font-size: 0.8125rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.card-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-top: 4px;
}

.card-value.primary { color: var(--primary); }
.card-value.success { color: var(--success); }
.card-value.warning { color: var(--warning); }
.card-value.danger { color: var(--danger); }

/* Controls bar */
.controls {
    background: #fff;
    padding: 16px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

.search-input {
    flex: 1;
    min-width: 200px;
    padding: 8px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.15s;
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}

.filter-select {
    padding: 8px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 0.875rem;
    background: #fff;
    outline: none;
    cursor: pointer;
}

.filter-select:focus {
    border-color: var(--primary);
}

/* Table */
.table-wrapper {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow-x: auto;
}

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

thead {
    background: var(--gray-50);
}

th {
    padding: 12px 16px;
    text-align: left;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    border-bottom: 1px solid var(--gray-200);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
}

th:hover {
    color: var(--gray-700);
}

th .sort-icon {
    margin-left: 4px;
    font-size: 0.75rem;
}

td {
    padding: 12px 16px;
    font-size: 0.875rem;
    border-bottom: 1px solid var(--gray-100);
    vertical-align: middle;
}

tr:last-child td {
    border-bottom: none;
}

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

.actions-cell {
    display: flex;
    gap: 6px;
    flex-wrap: nowrap;
}

/* Mobile cards (hidden on desktop) */
.mobile-cards {
    display: none;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.875rem;
}

.alert-error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: var(--success);
    border: 1px solid #bbf7d0;
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 16px;
}

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

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

.modal-header {
    padding: 20px 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-400);
    padding: 4px;
    line-height: 1;
}

.modal-close:hover {
    color: var(--gray-600);
}

.modal-body {
    padding: 20px 24px;
}

.modal-footer {
    padding: 0 24px 20px;
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

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

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 4px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 60px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
}

/* Login */
.login-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: var(--gray-100);
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 16px;
}

.login-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-card h1 {
    font-size: 1.5rem;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.login-subtitle {
    color: var(--gray-500);
    margin-bottom: 24px;
    font-size: 0.875rem;
}

.login-form {
    text-align: left;
}

/* Confirm dialog */
.confirm-text {
    font-size: 1rem;
    margin-bottom: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        align-items: stretch;
    }

    .header-actions {
        justify-content: stretch;
    }

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

    .dashboard-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .controls {
        flex-direction: column;
    }

    .search-input {
        width: 100%;
        min-width: 0;
    }

    .filter-select {
        width: 100%;
    }

    .table-wrapper table {
        display: none;
    }

    .mobile-cards {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }

    .mobile-card {
        background: #fff;
        border-radius: var(--radius);
        box-shadow: var(--shadow);
        padding: 16px;
    }

    .mobile-card-row {
        display: flex;
        justify-content: space-between;
        padding: 6px 0;
        border-bottom: 1px solid var(--gray-100);
        font-size: 0.875rem;
    }

    .mobile-card-row:last-child {
        border-bottom: none;
    }

    .mobile-card-label {
        color: var(--gray-500);
        font-weight: 500;
    }

    .mobile-card-value {
        font-weight: 600;
        text-align: right;
    }

    .mobile-card-actions {
        display: flex;
        gap: 8px;
        margin-top: 12px;
        flex-wrap: wrap;
    }

    .mobile-card-actions .btn {
        flex: 1;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .modal {
        max-width: 100%;
        margin: 0 8px;
    }
}

@media (max-width: 480px) {
    .dashboard-cards {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 1.1rem;
    }
}