/* ========================================
   Design System — CSS Variables
   ======================================== */
:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --primary-bg: #eef2ff;

    --success: #10b981;
    --success-bg: #d1fae5;
    --success-text: #065f46;

    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    --warning-text: #92400e;

    --danger: #ef4444;
    --danger-bg: #fee2e2;
    --danger-text: #991b1b;

    --info: #0ea5e9;
    --info-bg: #e0f2fe;
    --info-text: #075985;

    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);

    --transition: 0.2s ease-out;
}

/* ========================================
   Reset & Base
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 0 2rem;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-brand {
    color: white;
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    letter-spacing: -0.02em;
    white-space: nowrap;
}

.navbar-menu {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.navbar-menu a {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    font-size: 0.9rem;
    font-weight: 500;
}

.navbar-menu a:hover {
    background-color: rgba(255,255,255,0.15);
    color: white;
}

.navbar-menu a.active {
    background-color: rgba(255,255,255,0.2);
    color: white;
}

/* ========================================
   Container
   ======================================== */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
}

/* ========================================
   Card
   ======================================== */
.card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    transition: box-shadow var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--gray-200);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    padding: 0.55rem 1.1rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    line-height: 1.4;
    position: relative;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.btn-primary:hover {
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.35);
    transform: translateY(-1px);
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
}

.btn-success:hover {
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35);
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    color: white;
}

.btn-danger:hover {
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.35);
    transform: translateY(-1px);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning) 0%, #d97706 100%);
    color: white;
}

.btn-warning:hover {
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover {
    background: var(--gray-300);
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
}

/* ========================================
   Table
   ======================================== */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--gray-200);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

thead {
    background: var(--gray-50);
    border-bottom: 2px solid var(--gray-200);
}

th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--gray-600);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-700);
}

tbody tr {
    transition: background-color var(--transition);
}

tbody tr:hover {
    background-color: var(--primary-bg);
}

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

/* ========================================
   Forms
   ======================================== */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.375rem;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--gray-700);
}

.form-control {
    width: 100%;
    padding: 0.625rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    transition: all var(--transition);
    background: white;
    color: var(--gray-800);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.form-control::placeholder {
    color: var(--gray-400);
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

textarea.form-control {
    min-height: 100px;
    resize: vertical;
}

/* ========================================
   Checkbox Group
   ======================================== */
.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    background: white;
    min-height: 42px;
}

.checkbox-item {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    cursor: pointer;
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    border: 1px solid var(--gray-200);
    background: var(--gray-50);
    user-select: none;
}

.checkbox-item:hover {
    background: var(--primary-bg);
    border-color: var(--primary-light);
}

.checkbox-item:has(input:checked) {
    background: var(--primary-bg);
    border-color: var(--primary);
    color: var(--primary-dark);
}

.checkbox-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary);
}

.checkbox-item span {
    font-size: 0.85rem;
    color: var(--gray-700);
}

/* ========================================
   Modal
   ======================================== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
    backdrop-filter: blur(4px);
    animation: fadeIn 0.2s ease-out;
}

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

.modal-content {
    background: white;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 560px;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: modalIn 0.25s ease-out;
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
}

.modal-close {
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--gray-400);
    background: none;
    border: none;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.modal-close:hover {
    color: var(--gray-700);
    background: var(--gray-100);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* ========================================
   Pagination
   ======================================== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding-top: 1rem;
}

.pagination-btn,
.pagination button {
    padding: 0.45rem 1rem;
    border: 1px solid var(--gray-200);
    background: white;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all var(--transition);
    color: var(--gray-700);
}

.pagination-btn:hover:not(:disabled),
.pagination button:hover:not(:disabled) {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.pagination-btn:disabled,
.pagination button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

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

.pagination-info {
    margin: 0 0.5rem;
    color: var(--gray-500);
    font-size: 0.85rem;
}

/* ========================================
   Search Box
   ======================================== */
.search-box {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: flex-end;
    margin-bottom: 1.25rem;
}

.search-box .form-group {
    margin-bottom: 0;
    min-width: 140px;
    flex: 1 0 auto;
}

.search-box .form-group label {
    font-size: 0.8rem;
    margin-bottom: 0.25rem;
}

.search-box .form-control {
    padding: 0.5rem 0.7rem;
    font-size: 0.85rem;
}

.search-input {
    flex: 1;
    min-width: 200px;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    transition: all var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

/* ========================================
   Badges
   ======================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1.4;
    white-space: nowrap;
}

.badge-success {
    background-color: var(--success-bg);
    color: var(--success-text);
}

.badge-warning {
    background-color: var(--warning-bg);
    color: var(--warning-text);
}

.badge-danger {
    background-color: var(--danger-bg);
    color: var(--danger-text);
}

.badge-info {
    background-color: var(--info-bg);
    color: var(--info-text);
}

/* ========================================
   Toast Notifications
   ======================================== */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    pointer-events: none;
}

.toast {
    padding: 0.875rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    line-height: 1.5;
    box-shadow: var(--shadow-lg);
    pointer-events: auto;
    max-width: 420px;
    min-width: 280px;
    animation: toastIn 0.3s ease-out;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

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

.toast-info {
    background: var(--info-bg);
    color: var(--info-text);
    border-left: 4px solid var(--info);
}

.toast-warning {
    background: var(--warning-bg);
    color: var(--warning-text);
    border-left: 4px solid var(--warning);
}

.toast-close {
    margin-left: auto;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    opacity: 0.5;
    padding: 2px;
    line-height: 1;
    color: inherit;
    flex-shrink: 0;
}

.toast-close:hover {
    opacity: 1;
}

/* ========================================
   Loading
   ======================================== */
.loading {
    text-align: center;
    padding: 2.5rem 2rem;
    color: var(--gray-400);
}

.spinner {
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    animation: spin 0.7s linear infinite;
    margin: 0 auto 0.75rem;
}

.loading p {
    font-size: 0.85rem;
}

/* ========================================
   Action Buttons
   ======================================== */
.action-buttons {
    display: flex;
    gap: 0.375rem;
    flex-wrap: nowrap;
}

/* ========================================
   Empty State
   ======================================== */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray-400);
}

.empty-state-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    opacity: 0.4;
}

.empty-state-text {
    font-size: 0.9rem;
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes modalIn {
    from {
        transform: translateY(-20px) scale(0.96);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

@keyframes toastIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideDown {
    from {
        transform: translateY(-12px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .navbar {
        padding: 0 1rem;
        height: auto;
        flex-direction: column;
        padding-top: 0.75rem;
        padding-bottom: 0.75rem;
        gap: 0.5rem;
    }

    .navbar-menu {
        gap: 0.125rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .navbar-menu a {
        padding: 0.35rem 0.7rem;
        font-size: 0.8rem;
    }

    .container {
        padding: 1rem;
    }

    .card {
        padding: 1rem;
    }

    .search-box {
        flex-direction: column;
    }

    .search-box .form-group {
        min-width: 100%;
    }

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

    table {
        font-size: 0.8rem;
    }

    th, td {
        padding: 0.5rem 0.6rem;
    }

    .toast-container {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
    }

    .toast {
        min-width: auto;
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .modal-content {
        width: 95%;
        max-height: 90vh;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn-sm {
        padding: 0.3rem 0.6rem;
        font-size: 0.75rem;
    }
}