/**
 * Dzidza - Main Stylesheet
 * ZOU Dark Blue Theme with Child-Friendly Accents
 */

:root {
    /* Primary Colors - ZOU Dark Blue */
    --primary-dark: #002B6F;
    --primary: #003d99;
    --primary-light: #0052cc;
    
    /* Accent Colors - Child Friendly */
    --accent-yellow: #FFD700;
    --accent-green: #4ECDC4;
    --accent-orange: #FF6B6B;
    --accent-blue: #95E1D3;
    --accent-purple: #AA96DA;
    --accent-pink: #F38181;
    
    /* Neutral Colors */
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --gray: #6c757d;
    --dark-gray: #343a40;
    
    /* Sidebar */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 70px;
    --sidebar-bg: var(--primary-dark);
    --sidebar-text: var(--white);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-gray);
    color: var(--dark-gray);
    line-height: 1.6;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    transition: var(--transition);
    z-index: 1000;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.sidebar-header {
    padding: 1.5rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--white);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-logo i {
    font-size: 2rem;
    color: var(--accent-yellow);
}

.sidebar-logo-text {
    transition: var(--transition);
    opacity: 1;
}

.sidebar.collapsed .sidebar-logo-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.sidebar-toggle {
    background: transparent;
    border: none;
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background: rgba(255,255,255,0.1);
}

.sidebar.collapsed .sidebar-toggle i {
    transform: rotate(180deg);
}

.sidebar-nav {
    padding: 1rem 0;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin: 0.25rem 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.5rem;
    color: var(--sidebar-text);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: rgba(255,255,255,0.1);
    border-left-color: var(--accent-yellow);
    color: var(--white);
}

.nav-link.active {
    background: rgba(255,255,255,0.15);
    border-left-color: var(--accent-yellow);
    color: var(--accent-yellow);
}

.nav-link i {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
}

.nav-text {
    transition: var(--transition);
    opacity: 1;
}

.sidebar.collapsed .nav-text {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    transition: var(--transition);
    min-height: 100vh;
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--sidebar-collapsed-width);
}

/* Topbar */
.topbar {
    background: var(--white);
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.topbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-title {
    color: var(--primary-dark);
    font-weight: 600;
    margin: 0;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.language-selector select {
    border: 2px solid var(--primary);
    border-radius: 6px;
    padding: 0.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-name {
    font-weight: 500;
    color: var(--dark-gray);
}

/* Container */
.container-fluid {
    padding: 2rem;
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.category-card {
    background: var(--white);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-decoration: none;
    color: inherit;
    display: block;
}

.category-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.category-card-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.category-card-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin: 0;
}

/* Item Grid */
.item-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    padding: 2rem 0;
}

.item-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.item-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.item-card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--light-gray);
    transition: opacity 0.3s ease;
    display: block;
}

.item-card-image[loading="lazy"] {
    opacity: 0.8;
}

.item-card-image.loaded {
    opacity: 1;
}

.item-card-image.ai-loaded {
    /* AI image successfully loaded */
    opacity: 1;
}

.carousel-image.ai-loaded {
    /* AI image successfully loaded in carousel */
    opacity: 1;
}

/* Loading state for AI images - optimized animation */
.item-card-image:not(.loaded),
.carousel-image:not(.loaded) {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.2s ease-in-out infinite;
    will-change: background-position; /* Optimize animation performance */
}

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

/* Optimize image rendering */
.item-card-image,
.carousel-image {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    backface-visibility: hidden;
    transform: translateZ(0); /* Force GPU acceleration */
}

/* Carousel images - larger for item detail page */
.carousel-image {
    width: 100%;
    min-height: 400px;
    max-height: 600px;
    object-fit: cover;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 8px;
}

.item-card-body {
    padding: 1rem;
    text-align: center;
}

.item-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-dark);
    margin: 0;
}

/* Login/Register Pages */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.auth-container::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

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

.auth-card {
    background: var(--white);
    border-radius: 20px;
    padding: 3rem 2.5rem;
    width: 100%;
    max-width: 480px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    position: relative;
    z-index: 1;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
}

.auth-logo {
    text-align: center;
    margin-bottom: 2.5rem;
}

.auth-logo i {
    font-size: 5rem;
    color: var(--primary-dark);
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.auth-logo h1 {
    color: var(--primary-dark);
    font-weight: 700;
    margin-top: 1rem;
    font-size: 2.5rem;
    letter-spacing: -0.5px;
}

.auth-logo p {
    color: var(--gray);
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

.form-label {
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.form-control {
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    padding: 0.875rem 1rem;
    transition: var(--transition);
    font-size: 1rem;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(0, 43, 111, 0.15);
    outline: none;
}

.form-control::placeholder {
    color: #adb5bd;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    border: none;
    border-radius: 10px;
    padding: 0.875rem 2rem;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(0, 43, 111, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 43, 111, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-outline-primary {
    border: 2px solid var(--primary);
    color: var(--primary);
    border-radius: 10px;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: var(--transition);
}

.btn-outline-primary:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 43, 111, 0.3);
}

.alert {
    border-radius: 12px;
    border: none;
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.alert-danger {
    background: linear-gradient(135deg, #fee 0%, #fdd 100%);
    color: #721c24;
    border-left: 4px solid #dc3545;
}

.alert-success {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    border-left: 4px solid #28a745;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    color: #856404;
    border-left: 4px solid #ffc107;
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1 0%, #bee5eb 100%);
    color: #0c5460;
    border-left: 4px solid #17a2b8;
}

/* Dashboard Cards */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border-left: 5px solid var(--primary);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-dark), var(--primary-light));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.stat-card:hover::before {
    transform: scaleX(1);
}

.stat-card-title {
    font-size: 0.875rem;
    color: var(--gray);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.stat-card-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-dark);
    line-height: 1.2;
}

/* Cards */
.card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: white;
    border: none;
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    border-radius: 16px 16px 0 0 !important;
}

.card-body {
    padding: 1.5rem;
}

.shadow-sm {
    box-shadow: 0 2px 8px rgba(0,0,0,0.1) !important;
}

/* Tables */
.table {
    border-radius: 8px;
    overflow: hidden;
}

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

.table thead th {
    border: none;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    padding: 1rem;
}

.table tbody tr {
    transition: var(--transition);
}

.table tbody tr:hover {
    background-color: rgba(0, 43, 111, 0.05);
    transform: scale(1.01);
}

.table tbody td {
    padding: 1rem;
    vertical-align: middle;
}

/* Buttons */
.btn {
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition);
    padding: 0.625rem 1.25rem;
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 0.875rem 2rem;
    font-size: 1.1rem;
}

.btn-success {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(220, 53, 69, 0.3);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.4);
}

.btn-info {
    background: linear-gradient(135deg, #17a2b8 0%, #138496 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(23, 162, 184, 0.3);
}

.btn-info:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(23, 162, 184, 0.4);
}

/* Form Check */
.form-check-input {
    border-radius: 4px;
    border: 2px solid #dee2e6;
    width: 1.25rem;
    height: 1.25rem;
}

.form-check-input:checked {
    background-color: var(--primary);
    border-color: var(--primary);
}

/* Code */
code {
    background: #f8f9fa;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--primary-dark);
    font-weight: 600;
}

/* Badge */
.badge {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-weight: 600;
}

/* List Group */
.list-group-item {
    border: none;
    border-bottom: 1px solid #e9ecef;
    padding: 1rem;
    transition: var(--transition);
}

.list-group-item:hover {
    background-color: rgba(0, 43, 111, 0.05);
}

.list-group-item:last-child {
    border-bottom: none;
}

/* Welcome Section */
.welcome-section {
    background: linear-gradient(135deg, rgba(0, 43, 111, 0.05) 0%, rgba(0, 61, 153, 0.05) 100%);
    padding: 2rem;
    border-radius: 16px;
    margin-bottom: 2rem;
}

.welcome-section h2 {
    color: var(--primary-dark);
    font-weight: 700;
}

/* Topbar improvements */
.topbar {
    background: linear-gradient(135deg, var(--white) 0%, #f8f9fa 100%);
    border-bottom: 1px solid rgba(0, 43, 111, 0.1);
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .category-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    .item-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
}

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

.fade-in {
    animation: fadeIn 0.3s ease;
}

/* Color variations for categories */
.category-card[data-color="yellow"] { border-top: 4px solid var(--accent-yellow); }
.category-card[data-color="green"] { border-top: 4px solid var(--accent-green); }
.category-card[data-color="orange"] { border-top: 4px solid var(--accent-orange); }
.category-card[data-color="blue"] { border-top: 4px solid var(--accent-blue); }
.category-card[data-color="purple"] { border-top: 4px solid var(--accent-purple); }
.category-card[data-color="pink"] { border-top: 4px solid var(--accent-pink); }