/* ========================================
   RESET & BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #06b6d4;

    /* Grays */
    --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;

    /* Layout */
    --sidebar-width: 260px;
    --header-height: 64px;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
    font-family: var(--font-family);
    font-size: 14px;
    line-height: 1.5;
    color: var(--gray-900);
    background-color: var(--gray-50);
}

/* ========================================
   LOGIN PAGE
   ======================================== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.login-header p {
    color: var(--gray-600);
    font-size: 14px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="text"],
.form-group input[type="number"],
.form-group select,
.form-group textarea {
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-size: 14px;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--gray-700);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.error-message {
    padding: 12px;
    background-color: #fee2e2;
    border: 1px solid #fecaca;
    border-radius: var(--border-radius);
    color: #991b1b;
    font-size: 13px;
}

.success-message {
    padding: 12px;
    background-color: #d1fae5;
    border: 1px solid #a7f3d0;
    border-radius: var(--border-radius);
    color: #065f46;
    font-size: 13px;
}

.warning-message {
    padding: 12px;
    background-color: #fef3c7;
    border: 1px solid #fde68a;
    border-radius: var(--border-radius);
    color: #92400e;
    font-size: 13px;
}

.login-footer {
    margin-top: 24px;
    text-align: center;
    font-size: 13px;
    color: var(--gray-600);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--gray-800);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--gray-300);
}

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

.btn-success:hover:not(:disabled) {
    background-color: #059669;
}

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

.btn-danger:hover:not(:disabled) {
    background-color: #dc2626;
}

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

.btn-warning:hover:not(:disabled) {
    background-color: #d97706;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 20px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

.btn-loader {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========================================
   DASHBOARD LAYOUT
   ======================================== */
.dashboard {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--gray-900);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--gray-800);
}

.sidebar-header h1 {
    font-size: 18px;
    font-weight: 700;
}

.sidebar-header p {
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 4px;
}

.sidebar-nav {
    padding: 16px 0;
}

.nav-section {
    margin-bottom: 24px;
}

.nav-section-title {
    padding: 8px 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--gray-500);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px;
    color: var(--gray-300);
    text-decoration: none;
    transition: all 0.2s;
}

.nav-link:hover {
    background-color: var(--gray-800);
    color: white;
}

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

.nav-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    background-color: var(--gray-50);
}

.header {
    height: var(--header-height);
    background-color: white;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.2s;
}

.user-menu:hover {
    background-color: var(--gray-100);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-900);
}

.user-role {
    font-size: 11px;
    color: var(--gray-600);
}

.content-area {
    padding: 24px;
}

/* ========================================
   CARDS & TABLES
   ======================================== */
.card {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

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

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-900);
}

.card-body {
    padding: 20px;
}

.table-container {
    overflow-x: auto;
}

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

thead th {
    text-align: left;
    padding: 12px 16px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--gray-600);
    border-bottom: 2px solid var(--gray-200);
    background-color: var(--gray-50);
}

tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-200);
    font-size: 13px;
    color: var(--gray-700);
}

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

/* ========================================
   BADGES
   ======================================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 11px;
    font-weight: 600;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-success {
    background-color: #d1fae5;
    color: #065f46;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

.badge-info {
    background-color: #dbeafe;
    color: #1e40af;
}

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

/* ========================================
   STATS GRID
   ======================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 20px;
    border: 1px solid var(--gray-200);
    box-shadow: var(--shadow-sm);
}

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

.stat-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-600);
}

.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-change {
    font-size: 12px;
    margin-top: 8px;
}

.stat-change.positive {
    color: var(--success-color);
}

.stat-change.negative {
    color: var(--danger-color);
}

/* ========================================
   MODAL
   ======================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal {
    background-color: white;
    border-radius: 12px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

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

.modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
}

.modal-close {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    background-color: transparent;
    border: none;
    color: var(--gray-500);
    font-size: 24px;
    transition: all 0.2s;
}

.modal-close:hover {
    background-color: var(--gray-100);
    color: var(--gray-900);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-muted {
    color: var(--gray-600);
}

.text-sm {
    font-size: 13px;
}

.text-xs {
    font-size: 11px;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.flex {
    display: flex;
}

.items-center {
    align-items: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }