/* =============================================================================
   GlosKoll 2026 - Modern Design System
   ============================================================================= */

/* Google Fonts - Inter with extended weight range */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* =============================================================================
   CSS Custom Properties (Design Tokens)
   ============================================================================= */
:root {
    /* Lund Brand Colors */
    --lund-purple: #5B124D;
    --lund-purple-dark: #3D0C34;
    --lund-purple-light: #7D2F6F;
    --lund-purple-subtle: #faf5f9;

    /* Modern Color Palette */
    --primary-gradient: linear-gradient(135deg, #5B124D 0%, #7D2F6F 100%);
    --accent-color: #E879F9;
    --accent-dark: #C026D3;
    --accent-soft: rgba(232, 121, 249, 0.1);
    --accent-gradient: linear-gradient(135deg, #E879F9 0%, #C026D3 100%);

    /* Surfaces */
    --surface: #ffffff;
    --surface-raised: #ffffff;
    --surface-overlay: rgba(255, 255, 255, 0.85);

    /* Neutral Colors — slightly cooler for modern feel */
    --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;

    /* Semantic Colors */
    --success: #22c55e;
    --success-soft: rgba(34, 197, 94, 0.1);
    --warning: #f59e0b;
    --warning-soft: rgba(245, 158, 11, 0.1);
    --danger: #ef4444;
    --danger-soft: rgba(239, 68, 68, 0.1);
    --info: #3b82f6;
    --info-soft: rgba(59, 130, 246, 0.1);

    /* Shadows — refined for depth */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.07), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.07), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
    --shadow-glow: 0 0 24px rgba(91, 18, 77, 0.12);
    --shadow-accent-glow: 0 0 24px rgba(232, 121, 249, 0.2);

    /* Blur & Glass Effects */
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.3);
    --blur-amount: 16px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Layout */
    --content-max: 1200px;
    --content-narrow: 800px;
}

/* =============================================================================
   Base Styles
   ============================================================================= */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =============================================================================
   Typography
   ============================================================================= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--gray-900);
    letter-spacing: -0.025em;
    line-height: 1.2;
}

h1, h2 {
    font-weight: 700;
    letter-spacing: -0.03em;
}

.display-4 {
    font-weight: 800;
    letter-spacing: -0.035em;
    line-height: 1.1;
}

.display-5 {
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.15;
}

.lead {
    font-weight: 400;
    color: var(--gray-600);
    font-size: 1.15rem;
    line-height: 1.7;
}

/* Gradient text utility */
.gradient-text {
    background: linear-gradient(135deg, var(--lund-purple) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.accent-text {
    color: var(--accent-color);
}

/* =============================================================================
   Navbar - Glassmorphism Style
   ============================================================================= */
.navbar {
    background: var(--primary-gradient) !important;
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 0.6rem 0;
    position: sticky;
    top: 0;
    z-index: 1030;
    transition: padding var(--transition-base), box-shadow var(--transition-base);
}

.navbar.scrolled {
    padding: 0.4rem 0;
    box-shadow: 0 4px 20px rgba(91, 18, 77, 0.25);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: -0.03em;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 500;
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    font-size: 0.92rem;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.12);
}

.navbar-dark .navbar-nav .nav-link.active {
    color: #fff;
    background-color: rgba(255, 255, 255, 0.15);
}

.dropdown-menu {
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    padding: 0.5rem;
    background: white;
    animation: dropdownFadeIn var(--transition-fast) ease-out;
    z-index: 1100 !important;
    position: absolute;
}

@keyframes dropdownFadeIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-item {
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--lund-purple-subtle);
    color: var(--lund-purple);
}

/* =============================================================================
   Buttons - Modern Style with Micro-interactions
   ============================================================================= */
.btn {
    font-weight: 500;
    border-radius: var(--radius-sm);
    padding: 0.5rem 1.25rem;
    transition: all var(--transition-base);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: var(--primary-gradient) !important;
    border: none !important;
    box-shadow: var(--shadow-sm), 0 2px 8px rgba(91, 18, 77, 0.2);
}

.btn-primary:hover {
    box-shadow: var(--shadow-md), 0 4px 12px rgba(91, 18, 77, 0.3);
    transform: translateY(-1px);
}

.btn-primary:focus {
    box-shadow: var(--shadow-md), 0 0 0 3px rgba(91, 18, 77, 0.25);
}

.btn-outline-primary {
    color: var(--lund-purple);
    border: 2px solid var(--lund-purple) !important;
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--lund-purple-subtle);
    color: var(--lund-purple);
    border-color: var(--lund-purple) !important;
    transform: translateY(-1px);
}

.btn-outline-secondary {
    color: var(--gray-600);
    border: 2px solid var(--gray-300) !important;
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--gray-100);
    color: var(--gray-700);
    border-color: var(--gray-400) !important;
}

.btn-success {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%) !important;
    border: none !important;
    box-shadow: var(--shadow-sm), 0 2px 8px rgba(34, 197, 94, 0.25);
}

.btn-success:hover {
    box-shadow: var(--shadow-md), 0 4px 12px rgba(34, 197, 94, 0.35);
    transform: translateY(-1px);
}

.btn-outline-success {
    color: var(--success);
    border: 2px solid var(--success) !important;
    background: transparent;
}

.btn-outline-success:hover {
    background: var(--success-soft);
    color: var(--success);
    border-color: var(--success) !important;
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%) !important;
    border: none !important;
}

.btn-outline-danger {
    color: var(--danger);
    border: 2px solid var(--danger) !important;
    background: transparent;
}

.btn-outline-danger:hover {
    background: var(--danger-soft);
    color: var(--danger);
    border-color: var(--danger) !important;
}

.btn-info {
    background: linear-gradient(135deg, var(--lund-purple-light) 0%, var(--lund-purple) 100%) !important;
    border: none !important;
    color: white !important;
}

.btn-outline-info {
    color: var(--lund-purple-light);
    border: 2px solid var(--lund-purple-light) !important;
    background: transparent;
}

.btn-outline-info:hover {
    background: var(--lund-purple-subtle);
    color: var(--lund-purple);
}

/* Accent button — energetic CTA */
.btn-accent {
    background: var(--accent-gradient);
    border: none;
    color: white;
    box-shadow: var(--shadow-sm), 0 2px 8px rgba(232, 121, 249, 0.25);
}

.btn-accent:hover {
    box-shadow: var(--shadow-md), 0 4px 16px rgba(232, 121, 249, 0.35);
    transform: translateY(-1px);
    color: white;
}

.btn-accent:focus {
    box-shadow: var(--shadow-md), 0 0 0 3px rgba(232, 121, 249, 0.25);
    color: white;
}

/* Ghost button — minimal, text-style */
.btn-ghost {
    background: transparent;
    border: none;
    color: var(--gray-600);
    padding: 0.5rem 1rem;
}

.btn-ghost:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
    border-radius: var(--radius-md);
}

.btn-sm {
    padding: 0.35rem 0.85rem;
    font-size: 0.875rem;
}

/* Button Groups */
.btn-group .btn {
    border-radius: 0;
}

.btn-group .btn:first-child {
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.btn-group .btn:last-child {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* =============================================================================
   Cards - Modern Elevated Style
   ============================================================================= */
.card {
    background: var(--surface);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    margin-bottom: 1.5rem;
    transition: all var(--transition-base);
    overflow: hidden;
}

/* Only interactive cards should lift on hover — use .card-interactive */
.card-interactive:hover,
.exercise-card:hover,
.exercise-link:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--gray-300);
}

/* Stat card — compact metric display */
.card-stat {
    border: 1px solid var(--gray-100);
    border-radius: var(--radius-lg);
    background: var(--surface);
    padding: 1.25rem;
    text-align: center;
    transition: all var(--transition-base);
}

.card-stat:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--gray-200);
}

.card-stat .stat-value {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.card-stat .stat-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-top: 0.25rem;
}

/* Glass card variant */
.card-glass {
    background: var(--surface-overlay);
    backdrop-filter: blur(var(--blur-amount));
    -webkit-backdrop-filter: blur(var(--blur-amount));
    border: 1px solid var(--glass-border);
}

.card-header {
    background: linear-gradient(180deg, var(--gray-50) 0%, white 100%);
    border-bottom: 1px solid var(--gray-200);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0 !important;
    padding: 1rem 1.25rem;
    font-weight: 600;
}

.card-header.bg-primary {
    background: var(--primary-gradient) !important;
    border-bottom: none;
    color: white !important;
}

/* Ensure all text on primary/purple backgrounds is white */
.bg-primary,
.bg-primary *:not(.btn):not(.badge):not(.dropdown-menu):not(.dropdown-menu *),
.lund-bg,
.lund-bg *:not(.btn):not(.badge) {
    color: white !important;
}

/* Fix for card headers with bg-primary */
.card-header.bg-primary * {
    color: white !important;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.25rem;
}

.card-title {
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
}

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

/* =============================================================================
   Form Controls - Modern Clean Style
   ============================================================================= */
.form-control, .form-select {
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    padding: 0.625rem 1rem;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    background-color: white;
}

.form-control:focus, .form-select:focus {
    border-color: var(--lund-purple);
    box-shadow: 0 0 0 3px rgba(91, 18, 77, 0.1);
    outline: none;
}

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

.form-label {
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--gray-300);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

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

.form-check-input:focus {
    box-shadow: 0 0 0 3px rgba(91, 18, 77, 0.15);
}

.input-group-text {
    background: var(--gray-100);
    border: 2px solid var(--gray-200);
    border-right: none;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    color: var(--gray-500);
}

.input-group .form-control {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* =============================================================================
   Badges - Pill Style
   ============================================================================= */
.badge {
    font-weight: 500;
    padding: 0.35em 0.75em;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
}

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

.badge.bg-success {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%) !important;
}

.badge.bg-secondary {
    background: var(--gray-500) !important;
}

.badge.bg-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%) !important;
    color: white;
}

.badge.bg-danger {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%) !important;
}

/* =============================================================================
   Alerts - Modern Style
   ============================================================================= */
.alert {
    border: none;
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    border-left: 4px solid;
}

.alert-info {
    background: var(--info-soft);
    border-left-color: var(--info);
    color: #1e40af;
}

.alert-success {
    background: var(--success-soft);
    border-left-color: var(--success);
    color: #166534;
}

.alert-warning {
    background: var(--warning-soft);
    border-left-color: var(--warning);
    color: #92400e;
}

.alert-danger {
    background: var(--danger-soft);
    border-left-color: var(--danger);
    color: #991b1b;
}

/* =============================================================================
   Tables - Clean Modern Style
   ============================================================================= */
.table {
    border-collapse: separate;
    border-spacing: 0;
}

.table th {
    font-weight: 600;
    color: var(--gray-700);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem;
    background: var(--gray-50);
    border-bottom: 2px solid var(--gray-200);
}

.table td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid var(--gray-100);
}

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

.table-hover tbody tr:hover {
    background-color: var(--lund-purple-subtle);
}

/* =============================================================================
   Pagination - Modern Style
   ============================================================================= */
.pagination {
    gap: 0.25rem;
}

.page-link {
    border: none;
    border-radius: var(--radius-sm) !important;
    color: var(--gray-600);
    font-weight: 500;
    padding: 0.5rem 0.875rem;
    transition: all var(--transition-fast);
}

.page-link:hover {
    background: var(--lund-purple-subtle);
    color: var(--lund-purple);
}

.page-item.active .page-link {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-sm);
}

.page-item.disabled .page-link {
    color: var(--gray-400);
    background: transparent;
}

/* =============================================================================
   Modal - Modern Style
   ============================================================================= */
.modal-content {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.modal-header {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    padding: 1.25rem 1.5rem;
}

.modal-title {
    font-weight: 600;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: 1rem 1.5rem;
}

.modal-backdrop.show {
    opacity: 0.5;
    backdrop-filter: blur(4px);
}

/* =============================================================================
   Nav Tabs - Modern Underline Style
   ============================================================================= */
.nav-tabs {
    border-bottom: 2px solid var(--gray-200);
    gap: 0.5rem;
}

.nav-tabs .nav-link {
    border: none;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    color: var(--gray-600);
    font-weight: 500;
    padding: 0.75rem 1.25rem;
    position: relative;
    transition: all var(--transition-fast);
}

.nav-tabs .nav-link:hover {
    color: var(--lund-purple);
    background: var(--lund-purple-subtle);
}

.nav-tabs .nav-link.active {
    color: var(--lund-purple);
    background: transparent;
    border-bottom: 3px solid var(--lund-purple);
    margin-bottom: -2px;
}

/* =============================================================================
   Breadcrumb
   ============================================================================= */
.breadcrumb {
    background: transparent;
    padding: 0.5rem 0;
    margin-bottom: 1rem;
}

.breadcrumb-item {
    font-size: 0.9rem;
}

.breadcrumb-item a {
    color: var(--gray-500);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
    color: var(--lund-purple);
}

.breadcrumb-item.active {
    color: var(--gray-700);
    font-weight: 500;
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--gray-400);
}

/* =============================================================================
   List Groups
   ============================================================================= */
.list-group {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.list-group-item {
    border: none;
    border-bottom: 1px solid var(--gray-100);
    padding: 1rem 1.25rem;
    transition: background-color var(--transition-fast);
}

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

.list-group-item:hover {
    background-color: var(--gray-50);
}

/* =============================================================================
   Flashcards - Enhanced Animation
   ============================================================================= */
.flashcard {
    perspective: 1000px;
    height: 280px;
    margin-bottom: 1.5rem;
    cursor: pointer;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
    transition: box-shadow var(--transition-base);
}

.flashcard:hover .flashcard-front,
.flashcard:hover .flashcard-back {
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.flashcard-front {
    background: linear-gradient(135deg, #ffffff 0%, var(--gray-50) 100%);
    color: var(--gray-800);
    z-index: 2;
    border: 1px solid var(--gray-200);
}

.flashcard-back {
    background: var(--primary-gradient);
    color: white;
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
}

.language-label {
    font-size: 0.85rem;
    margin-bottom: 0.75rem;
    color: inherit;
    opacity: 0.7;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.word {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.instruction {
    font-size: 0.85rem;
    margin-top: 1.5rem;
    color: inherit;
    opacity: 0.6;
}

/* =============================================================================
   Match Cards - Game Style
   ============================================================================= */
.match-card {
    height: 100px;
    margin-bottom: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border-radius: var(--radius-md);
    border: 2px solid var(--gray-200);
    background: white;
}

.match-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--lund-purple-light);
}

.match-card.flipped {
    background-color: var(--lund-purple-subtle);
    border-color: var(--lund-purple-light);
}

.match-card.matched {
    background: var(--success-soft);
    border-color: var(--success);
    animation: matchPulse 0.3s ease-out;
}

@keyframes matchPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

/* =============================================================================
   Matching Options
   ============================================================================= */
.matching-column {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.matching-option {
    padding: 1rem 1.25rem;
    background: white;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: 500;
}

.matching-option:hover {
    background: var(--gray-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--lund-purple-light);
}

.matching-option.selected {
    background: var(--lund-purple-subtle);
    border-color: var(--lund-purple);
    box-shadow: 0 0 0 3px rgba(91, 18, 77, 0.1);
}

.matching-option.matched {
    cursor: default;
    opacity: 0.7;
}

.matching-option.correct-match {
    background: var(--success-soft);
    border-color: var(--success);
    animation: correctPulse 0.4s ease-out;
}

.matching-option.incorrect-match {
    background: var(--danger-soft);
    border-color: var(--danger);
    animation: shake 0.4s ease-out;
}

@keyframes correctPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* =============================================================================
   Lund-specific Utility Classes
   ============================================================================= */
.lund-bg {
    background: var(--primary-gradient);
    color: white;
}

.lund-text {
    color: var(--lund-purple);
}

.lund-border {
    border-color: var(--lund-purple);
}

/* =============================================================================
   Override Bootstrap Theme Colors
   ============================================================================= */
a {
    color: var(--lund-purple);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--lund-purple-dark);
}

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

.text-primary {
    color: var(--lund-purple) !important;
}

.border-primary {
    border-color: var(--lund-purple) !important;
}

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

/* =============================================================================
   Footer - Modern Dark Style
   ============================================================================= */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.footer a {
    color: var(--gray-300);
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--accent-color);
}

.footer .footer-brand {
    color: white;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.footer .footer-tagline {
    color: var(--gray-500);
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

.footer .footer-section-title {
    color: var(--gray-300);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.75rem;
}

.footer .footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer .footer-links li + li {
    margin-top: 0.4rem;
}

.footer .footer-links a {
    font-size: 0.9rem;
}

.footer .footer-bottom {
    border-top: 1px solid var(--gray-800);
    padding-top: 1.5rem;
    margin-top: 2rem;
    font-size: 0.85rem;
    color: var(--gray-500);
}

/* =============================================================================
   Loading & Progress Indicators
   ============================================================================= */
.spinner-border {
    width: 1.25rem;
    height: 1.25rem;
    border-width: 2px;
}

.progress {
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--gray-200);
    overflow: hidden;
}

.progress-bar {
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* =============================================================================
   Card Action Buttons - Unified Style
   ============================================================================= */
.btn-card {
    background: white;
    color: var(--gray-700);
    border: 1px solid var(--gray-200) !important;
    font-weight: 500;
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-align: center;
    white-space: nowrap;
}

.btn-card:hover {
    background: var(--gray-50);
    border-color: var(--gray-300) !important;
    color: var(--gray-800);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

.btn-card i {
    opacity: 0.7;
}

.btn-card:hover i {
    opacity: 1;
}

.btn-card-primary {
    background: var(--primary-gradient);
    color: white;
    border: none !important;
    font-weight: 500;
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-align: center;
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(91, 18, 77, 0.2);
}

.btn-card-primary:hover {
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(91, 18, 77, 0.3);
}

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

/* =============================================================================
   Exercise Cards - Clickable Card Style
   ============================================================================= */
.exercise-card {
    border: 2px solid var(--gray-200);
    transition: all var(--transition-base);
    cursor: pointer;
}

.exercise-card:hover {
    border-color: var(--lund-purple);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.exercise-card .exercise-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: var(--lund-purple-subtle);
    color: var(--lund-purple);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.exercise-card:hover .exercise-icon {
    background: var(--primary-gradient);
    color: white;
    transform: scale(1.05);
}

.exercise-card .card-title {
    color: var(--gray-800);
    transition: color var(--transition-fast);
}

.exercise-card:hover .card-title {
    color: var(--lund-purple);
}

/* =============================================================================
   Feature Cards (Index Page)
   ============================================================================= */
.card.h-100.shadow-sm {
    border: 1px solid var(--gray-100);
}

.card.h-100.shadow-sm:hover {
    border-color: var(--lund-purple-light);
}

.card.h-100.shadow-sm .card-body i.lund-text {
    transition: transform var(--transition-base);
}

.card.h-100.shadow-sm:hover .card-body i.lund-text {
    transform: scale(1.1);
}

/* =============================================================================
   Responsive Adjustments
   ============================================================================= */
@media (max-width: 768px) {
    .flashcard {
        height: 200px;
    }

    .flashcard-front, .flashcard-back {
        padding: 1.5rem;
    }

    .word {
        font-size: 1.75rem;
    }

    .btn-lg {
        padding: 0.625rem 1.5rem;
        font-size: 1rem;
    }

    .card-body {
        padding: 1.25rem;
    }

    .display-4 {
        font-size: 2rem;
    }

    .display-5 {
        font-size: 1.75rem;
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1.1rem;
    }

    .btn {
        padding: 0.5rem 1rem;
    }

    .card {
        margin-bottom: 1rem;
    }
}

/* =============================================================================
   Print Styles
   ============================================================================= */
@media print {
    .navbar, .footer, .btn {
        display: none !important;
    }

    .card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
    }
}

/* =============================================================================
   Accessibility - Focus States
   ============================================================================= */
:focus-visible {
    outline: 2px solid var(--lund-purple);
    outline-offset: 2px;
}

.btn:focus-visible {
    outline: 2px solid var(--lund-purple);
    outline-offset: 2px;
}

/* Skip to main content link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--lund-purple);
    color: white;
    padding: 8px 16px;
    z-index: 9999;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* =============================================================================
   Exercise Link Cards (Compact Grid)
   ============================================================================= */
.exercise-link {
    border: 2px solid;
    transition: all var(--transition-base);
}

.exercise-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.exercise-link:hover h6 {
    color: inherit;
}

.exercise-link .card-body {
    padding: 0.75rem !important;
}

.exercise-link h6 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-700);
    transition: color var(--transition-fast);
}

/* =============================================================================
   Exercise Grid Cards - Aligned Buttons
   ============================================================================= */
.tab-pane#practice .card.h-100 .card-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
}

.tab-pane#practice .card.h-100 .card-body .card-text {
    flex-grow: 1;
}

.tab-pane#practice .card.h-100 .card-body .btn {
    margin-top: auto;
}

/* =============================================================================
   Utility Classes — Layout & Animation
   ============================================================================= */
.container-narrow {
    max-width: var(--content-narrow);
    margin-left: auto;
    margin-right: auto;
}

.section-padding {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

@media (min-width: 768px) {
    .section-padding {
        padding-top: 5rem;
        padding-bottom: 5rem;
    }
}

/* Entrance animations */
.fade-in-up {
    animation: fadeInUp 0.5s ease-out both;
}

.fade-in-up-delay-1 { animation-delay: 0.1s; }
.fade-in-up-delay-2 { animation-delay: 0.2s; }
.fade-in-up-delay-3 { animation-delay: 0.3s; }
.fade-in-up-delay-4 { animation-delay: 0.4s; }

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

.fade-in {
    animation: fadeIn 0.4s ease-out both;
}

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

/* Subtle float animation for decorative elements */
.float-subtle {
    animation: floatSubtle 6s ease-in-out infinite;
}

.float-subtle-delay {
    animation: floatSubtle 6s ease-in-out infinite;
    animation-delay: -3s;
}

@keyframes floatSubtle {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* Divider — replaces <hr> */
.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, var(--gray-200) 50%, transparent 100%);
    border: none;
    margin: 3rem 0;
}

/* Badge accent variant */
.badge.bg-accent {
    background: var(--accent-gradient) !important;
    color: white;
}

/* Accent progress bar */
.progress-bar.bg-accent {
    background: var(--accent-gradient);
}

/* =============================================================================
   Bootstrap Override — Cascade fix for 22+ practice templates
   Maps Bootstrap utilities to GlosKoll design system without editing each template
   ============================================================================= */

/* Primary color override */
.bg-primary,
.card-header.bg-primary,
.btn-primary {
    background-color: var(--lund-purple) !important;
    border-color: var(--lund-purple) !important;
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--lund-purple-dark) !important;
    border-color: var(--lund-purple-dark) !important;
}

.btn-outline-primary {
    color: var(--lund-purple);
    border-color: var(--lund-purple);
}

.btn-outline-primary:hover,
.btn-outline-primary:focus,
.btn-outline-primary:active,
.btn-outline-primary.active {
    background-color: var(--lund-purple) !important;
    border-color: var(--lund-purple) !important;
    color: white;
}

.text-primary {
    color: var(--lund-purple) !important;
}

/* Card refinements for practice templates */
.card {
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
}

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

.card-header {
    font-weight: 600;
    border-bottom: 1px solid var(--gray-100);
}

.card-header.bg-primary {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.card-footer {
    background: var(--gray-50);
    border-top: 1px solid var(--gray-100);
}

/* Table styling cascade */
.table {
    --bs-table-bg: transparent;
}

.table thead th {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--gray-500);
}

.table-dark th {
    background: var(--gray-800) !important;
    color: var(--gray-200) !important;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Badge refinements */
.badge {
    font-weight: 600;
    letter-spacing: 0.01em;
}

.badge.bg-primary {
    background: var(--lund-purple) !important;
}

.badge.bg-success {
    background: var(--success) !important;
}

.badge.bg-danger {
    background: var(--danger) !important;
}

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

.badge.bg-info {
    background: var(--info) !important;
}

/* Alert refinements */
.alert {
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
}

.alert-success {
    background: var(--success-soft);
    color: #166534;
}

.alert-danger {
    background: var(--danger-soft);
    color: #991b1b;
}

.alert-info {
    background: var(--info-soft);
    color: #1e40af;
}

.alert-warning {
    background: var(--warning-soft);
    color: #92400e;
}

/* Progress bar refinement */
.progress {
    border-radius: 100px;
    background: var(--gray-100);
    height: 10px;
}

.progress-bar {
    border-radius: 100px;
}

.progress-bar.bg-success {
    background: linear-gradient(90deg, var(--success), #4ade80) !important;
}

.progress-bar.bg-danger {
    background: linear-gradient(90deg, var(--danger), #f87171) !important;
}

/* Form controls in exercises */
.form-control:focus {
    border-color: var(--lund-purple-light);
    box-shadow: 0 0 0 0.2rem rgba(91, 18, 77, 0.15);
}

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

/* Generic page titles — give all h1 inside content area better weight */
main h1 {
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* Lead text styling */
.lead {
    color: var(--gray-500);
    font-weight: 400;
}

/* Link color override */
a {
    color: var(--lund-purple);
}

a:hover {
    color: var(--lund-purple-dark);
}

/* Breadcrumb styling */
.breadcrumb {
    font-size: 0.85rem;
    padding: 0.5rem 0;
    margin-bottom: 0;
    background: none;
}

.breadcrumb-item a {
    color: var(--gray-500);
    text-decoration: none;
}

.breadcrumb-item a:hover {
    color: var(--lund-purple);
}

.breadcrumb-item.active {
    color: var(--gray-400);
}

/* =============================================================================
   Skrivuppgifter — Writing Assignment Module
   ============================================================================= */
.skriv-card {
    transition: all var(--transition-base);
    border: 1px solid var(--gray-100) !important;
}

.skriv-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: var(--lund-purple-light) !important;
}

.skriv-card:hover .card-title {
    color: var(--lund-purple) !important;
}

/* Student writing interface — split panel */
.skriv-editor-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.skriv-editor-panel textarea {
    flex: 1;
    resize: none;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    font-size: 1rem;
    line-height: 1.7;
    font-family: 'Inter', sans-serif;
}

.skriv-editor-panel textarea:focus {
    border-color: var(--lund-purple-light);
    box-shadow: 0 0 0 0.2rem rgba(91, 18, 77, 0.1);
    outline: none;
}

/* AI feedback panel */
.skriv-feedback-tabs .nav-link {
    color: var(--gray-600);
    font-size: 0.85rem;
    font-weight: 500;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
}

.skriv-feedback-tabs .nav-link.active {
    background: var(--lund-purple);
    color: white;
}

.skriv-feedback-tabs .nav-link:hover:not(.active) {
    background: var(--gray-100);
    color: var(--gray-800);
}

/* Teacher review — 3-panel layout */
.skriv-review-sidebar {
    border-right: 1px solid var(--gray-200);
    overflow-y: auto;
}

.skriv-review-sidebar .student-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--gray-100);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.skriv-review-sidebar .student-item:hover {
    background: var(--gray-50);
}

.skriv-review-sidebar .student-item.active {
    background: var(--lund-purple-subtle);
    border-left: 3px solid var(--lund-purple);
}

/* Text type library cards */
.texttyp-card {
    transition: all var(--transition-base);
    cursor: pointer;
    border: 1px solid var(--gray-100) !important;
}

.texttyp-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--lund-purple-light) !important;
}

/* Version navigation */
.skriv-version-nav .btn {
    font-size: 0.85rem;
    padding: 0.25rem 0.75rem;
}

/* Score indicator circles */
.skriv-score {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.85rem;
}

.skriv-score-high { background: var(--success-soft); color: #166534; }
.skriv-score-mid { background: var(--warning-soft); color: #92400e; }
.skriv-score-low { background: var(--danger-soft); color: #991b1b; }

/* Responsive stacking for writing interface */
@media (max-width: 768px) {
    .skriv-split-panel {
        flex-direction: column !important;
        height: auto !important;
    }

    .skriv-split-panel > div {
        width: 100% !important;
        min-height: 50vh;
    }
}

/* =============================================================================
   Dark Mode Preparation (Future Enhancement)
   ============================================================================= */
@media (prefers-color-scheme: dark) {
    /* Ready for dark mode implementation */
}