/* Critical CSS - Inline for instant render */
/* This CSS loads first to show page structure immediately */

:root {
    --primary: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #E3F2FD;
    --success: #4CAF50;
    --success-light: #E8F5E9;
    --danger: #F44336;
    --danger-light: #FFEBEE;
    --warning: #FF9800;
    --warning-light: #FFF3E0;
    --info: #00BCD4;
    --info-light: #E0F7FA;
    --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;
    --border-radius-sm: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--gray-50);
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
}

/* Skeleton loader styles - critical for instant feedback */
.skeleton-row {
    animation: pulse 1.5s ease-in-out infinite;
}

.skeleton-cell {
    height: 20px;
    background: linear-gradient(90deg, var(--gray-200) 0%, var(--gray-100) 50%, var(--gray-200) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

.instant-skeleton .skeleton-cell {
    animation: shimmer 1.2s infinite;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Table base styles */
.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.table th {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-50) 100%);
    padding: 14px;
    text-align: left;
    font-weight: 600;
    font-size: 13px;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-200);
}

.table td {
    padding: 14px;
    border-bottom: 1px solid var(--gray-200);
}

.table tbody tr {
    transition: background-color 0.15s ease;
}

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

/* Card styles */
.card {
    background: white;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: 24px;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--gray-200);
}

/* Loading states */
.loading-state {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    color: var(--gray-600);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Tab navigation */
.tab-navigation {
    display: flex;
    gap: 8px;
    padding: 16px 24px;
    border-bottom: 2px solid var(--gray-200);
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: transparent;
    color: var(--gray-600);
    font-weight: 600;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.tab-btn:hover:not(.active) {
    background: var(--gray-100);
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

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

.badge.submitted {
    background: var(--info-light);
    color: var(--info);
}

.badge.approved {
    background: var(--success-light);
    color: var(--success);
}

.badge.rejected {
    background: var(--danger-light);
    color: var(--danger);
}

/* Make content visible by default */
.tab-content {
    visibility: visible !important;
    opacity: 1 !important;
}

/* Optimistic rendering */
.optimistic-render {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Performance optimization - reduce repaints */
.table-container {
    contain: layout style paint;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Initial state - hide body until ready to prevent FOUC */
body.loading {
    visibility: hidden;
}

body.ready {
    visibility: visible;
    animation: bodyFadeIn 0.3s ease-out;
}

@keyframes bodyFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}