/* Enhanced styles for LEGO Instructions Manager */

/* ===== CSS Variables ===== */
:root {
    /* LEGO Brand Colors */
    --lego-red: #d11013;
    --lego-red-dark: #a00d10;
    --lego-yellow: #ffd700;
    --lego-yellow-bright: #ffed4e;
    --lego-blue: #0055bf;
    --lego-blue-light: #2b7fdb;
    
    /* Modern Palette */
    --primary-gradient: linear-gradient(135deg, #d11013 0%, #ff4757 100%);
    --secondary-gradient: linear-gradient(135deg, #0055bf 0%, #0abde3 100%);
    --success-gradient: linear-gradient(135deg, #10ac84 0%, #1dd1a1 100%);
    --warning-gradient: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    
    /* Neutrals */
    --gray-50: #f8f9fa;
    --gray-100: #e9ecef;
    --gray-200: #dee2e6;
    --gray-300: #ced4da;
    --gray-600: #6c757d;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.18);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ===== Base Styles ===== */
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(to bottom, #ffffff 0%, var(--gray-50) 100%);
    color: var(--gray-900);
}

main {
    flex: 1;
    padding-top: 2rem;
    padding-bottom: 4rem;
}

/* ===== Enhanced Navbar ===== */
.navbar {
    background: var(--primary-gradient) !important;
    box-shadow: var(--shadow-md);
    padding: 1rem 0;
    border-bottom: 3px solid var(--lego-red-dark);
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
    transition: transform var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand:hover {
    transform: translateY(-2px);
}

.navbar-brand i {
    font-size: 1.8rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.nav-link {
    font-weight: 500;
    transition: all var(--transition-fast);
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-md);
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
}

.navbar .dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    padding: 0.5rem;
}

.navbar .dropdown-item {
    border-radius: var(--radius-sm);
    padding: 0.6rem 1rem;
    transition: all var(--transition-fast);
}

.navbar .dropdown-item:hover {
    background: var(--gray-100);
    transform: translateX(4px);
}

/* ===== Hero Section ===== */
.display-3 {
    font-weight: 800;
    letter-spacing: -2px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.lead {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--gray-600);
    max-width: 800px;
    margin: 0 auto;
}

/* ===== Enhanced Buttons ===== */
.btn {
    font-weight: 600;
    border-radius: var(--radius-md);
    padding: 0.6rem 1.5rem;
    transition: all var(--transition-base);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-danger {
    background: var(--primary-gradient);
    box-shadow: var(--shadow-md);
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline-secondary,
.btn-outline-warning {
    border-width: 2px;
    font-weight: 600;
}

.btn-outline-secondary:hover {
    background: var(--gray-800);
    border-color: var(--gray-800);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 0.8rem 2rem;
    font-size: 1.1rem;
}

/* ===== Card Enhancements ===== */
.card {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    overflow: hidden;
    background: white;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
    border-bottom: 2px solid var(--gray-200);
    font-weight: 700;
    padding: 1.25rem 1.5rem;
}

.card-header h5 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--gray-800);
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background: transparent;
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
}

/* ===== Statistics Cards ===== */
.stat-card {
    border-left: 4px solid transparent;
    background: white;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: var(--gray-50);
    border-radius: 50%;
    transform: translate(30%, -30%);
    transition: all var(--transition-base);
}

.stat-card:hover::before {
    transform: translate(30%, -30%) scale(1.5);
}

.stat-card:nth-child(1) {
    border-left-color: var(--lego-blue);
}

.stat-card:nth-child(2) {
    border-left-color: #10ac84;
}

.stat-card:nth-child(3) {
    border-left-color: var(--lego-red);
}

.stat-card:nth-child(4) {
    border-left-color: var(--lego-yellow);
}

.stat-card h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin: 0;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-card h6 {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 1px;
    color: var(--gray-600);
}

.stat-card i.display-4 {
    font-size: 3rem;
    opacity: 0.15;
    position: relative;
    z-index: 1;
}

/* ===== Set Card Images ===== */
.set-image {
    height: 200px;
    object-fit: contain;
    background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
    padding: 1rem;
    transition: all var(--transition-base);
}

.dashboard a .set-image,
.dashboard a .card-img-top {
    transition: all var(--transition-base);
}

.dashboard a:hover .set-image,
.dashboard a:hover .card-img-top {
    transform: scale(1.05);
    filter: brightness(1.1);
}

/* ===== Badges ===== */
.badge {
    font-weight: 600;
    padding: 0.4em 0.8em;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.badge-theme {
    background: var(--secondary-gradient);
    color: white;
}

.badge-year {
    background: var(--warning-gradient);
    color: var(--gray-900);
    box-shadow: var(--shadow-sm);
}

.bg-warning {
    background: var(--warning-gradient) !important;
}

/* ===== List Groups ===== */
.list-group-item {
    border: none;
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem 1.25rem;
    transition: all var(--transition-fast);
}

.list-group-item:hover {
    background: var(--gray-50);
    padding-left: 1.5rem;
}

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

.list-group-flush .list-group-item:first-child {
    border-top: none;
}

.badge.rounded-pill {
    padding: 0.5em 1em;
    font-weight: 700;
}

/* ===== Feature Cards (Home Page) ===== */
.shadow-sm {
    box-shadow: var(--shadow-md) !important;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.shadow-sm:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl) !important;
}

.shadow-sm i.display-1 {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.shadow-sm h3 {
    font-weight: 700;
    color: var(--gray-800);
}

/* ===== Instruction Thumbnails ===== */
.instruction-thumbnail {
    width: 150px;
    height: 150px;
    object-fit: cover;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.instruction-thumbnail:hover {
    transform: scale(1.1) rotate(2deg);
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

/* ===== File Upload Area ===== */
.upload-area {
    border: 3px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    padding: 3rem;
    text-align: center;
    transition: all var(--transition-base);
    background: white;
}

.upload-area:hover {
    border-color: var(--lego-red);
    background: linear-gradient(135deg, var(--gray-50) 0%, white 100%);
    transform: scale(1.02);
}

.upload-area.dragover {
    border-color: var(--lego-red);
    background: linear-gradient(135deg, #fff3cd 0%, white 100%);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

/* ===== Pagination ===== */
.pagination {
    gap: 0.5rem;
}

.pagination .page-link {
    color: var(--lego-red);
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.pagination .page-link:hover {
    background: var(--primary-gradient);
    color: white;
    border-color: var(--lego-red);
    transform: translateY(-2px);
}

.pagination .page-item.active .page-link {
    background: var(--primary-gradient);
    border-color: var(--lego-red);
    box-shadow: var(--shadow-md);
}

/* ===== Footer ===== */
footer {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    color: var(--gray-300);
    padding: 2rem 0;
    margin-top: auto;
    border-top: 4px solid var(--lego-red);
}

footer p {
    margin: 0;
    font-size: 0.9rem;
}

footer .badge {
    font-size: 0.8rem;
    padding: 0.4em 0.8em;
}

/* ===== Flash Messages ===== */
.alert {
    border: none;
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    box-shadow: var(--shadow-md);
    border-left: 4px solid;
    animation: slideIn 0.3s ease;
}

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

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

.alert-danger {
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
    border-left-color: #dc3545;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    border-left-color: var(--lego-yellow);
}

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

/* ===== Search Container ===== */
.search-container {
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.search-container .form-control {
    border-radius: var(--radius-lg);
    padding: 0.8rem 1.5rem;
    border: 2px solid var(--gray-300);
    transition: all var(--transition-fast);
    font-size: 1rem;
}

.search-container .form-control:focus {
    border-color: var(--lego-red);
    box-shadow: 0 0 0 0.2rem rgba(209, 16, 19, 0.15);
}

/* ===== Loading Spinner ===== */
.spinner-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
}

.spinner-border {
    width: 3rem;
    height: 3rem;
    border-width: 0.3rem;
}

/* ===== Empty States ===== */
.text-center.py-5 {
    padding: 4rem 2rem !important;
}

.text-center i.display-1 {
    font-size: 5rem;
    opacity: 0.3;
    margin-bottom: 1rem;
}

/* ===== MOC Badge ===== */
.bg-warning.text-dark {
    background: var(--warning-gradient) !important;
    box-shadow: var(--shadow-sm);
}

/* ===== Form Controls ===== */
.form-control,
.form-select {
    border-radius: var(--radius-md);
    border: 2px solid var(--gray-300);
    padding: 0.6rem 1rem;
    transition: all var(--transition-fast);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--lego-red);
    box-shadow: 0 0 0 0.2rem rgba(209, 16, 19, 0.15);
}

/* ===== Responsive Adjustments ===== */
@media (max-width: 768px) {
    .set-image {
        height: 150px;
    }
    
    .instruction-thumbnail {
        width: 100px;
        height: 100px;
    }
    
    .stat-card h2 {
        font-size: 2rem;
    }
    
    .display-3 {
        font-size: 2.5rem;
    }
    
    .navbar-brand {
        font-size: 1.25rem;
    }
}

@media (max-width: 576px) {
    .btn-lg {
        padding: 0.6rem 1.5rem;
        font-size: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .stat-card h2 {
        font-size: 1.75rem;
    }
}

/* ===== Print Styles ===== */
@media print {
    .navbar, .btn, footer, .alert {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
}

/* ===== Accessibility ===== */
.btn:focus,
.form-control:focus,
.form-select:focus {
    outline: 3px solid var(--lego-yellow);
    outline-offset: 2px;
}

/* ===== LEGO Brick Pattern (Optional Background) ===== */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(209, 16, 19, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(0, 85, 191, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

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

/* ===== Selection Color ===== */
::selection {
    background: var(--lego-red);
    color: white;
}

::-moz-selection {
    background: var(--lego-red);
    color: white;
}