/* MathNet Explorer - Styles */

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

:root {
    /* Color palette — Slate scale, muted and professional */
    --color-primary-50: #f8fafc;
    --color-primary-100: #f1f5f9;
    --color-primary-200: #e2e8f0;
    --color-primary-500: #475569;
    --color-primary-600: #334155;
    --color-primary-700: #1e293b;

    --color-secondary-50: #f8fafc;
    --color-secondary-500: #64748b;
    --color-secondary-600: #475569;
    --color-secondary-100: #f1f5f9;
    --color-secondary-700: #334155;

    --color-accent-50: #f8fafc;
    --color-accent-100: #f1f5f9;
    --color-accent-500: #475569;
    --color-accent-600: #334155;
    --color-accent-700: #1e293b;

    --color-success-50: #f0fdf4;
    --color-success-500: #059669;
    --color-success-700: #047857;

    --color-error-50: #fef2f2;
    --color-error-500: #dc2626;

    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Background colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;

    /* Spacing system */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'SF Mono', 'JetBrains Mono', 'Cascadia Code', 'Roboto Mono', monospace;

    /* Shadows — subtle */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-md: 0 1px 3px 0 rgba(0, 0, 0, 0.06), 0 1px 2px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);

    /* Border radius — restrained */
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --radius-full: 4px;

    /* Transitions — professional, no bounce */
    --transition-fast: 100ms ease-out;
    --transition-base: 150ms ease-out;
    --transition-slow: 200ms ease-out;
}

/* Dark Mode — VS Code inspired */
body.dark-mode {
    --color-gray-50: #1e1e1e;
    --color-gray-100: #252526;
    --color-gray-200: #333333;
    --color-gray-300: #3c3c3c;
    --color-gray-400: #6e6e6e;
    --color-gray-500: #999999;
    --color-gray-600: #cccccc;
    --color-gray-700: #d4d4d4;
    --color-gray-800: #e0e0e0;
    --color-gray-900: #f0f0f0;

    --bg-primary: #1e1e1e;
    --bg-secondary: #252526;
    --text-primary: #d4d4d4;
    --text-secondary: #858585;
    --border-color: #333333;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Header */
.header {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.header-title h1 {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 0;
}

.header-title p {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.btn-header {
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.8125rem;
}

.btn-header:hover {
    background: var(--color-gray-100);
    color: var(--text-primary);
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn var(--transition-base);
}

.modal-overlay.show {
    display: flex;
}

.modal {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp var(--transition-base);
}

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

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--space-sm);
    line-height: 1;
    transition: color var(--transition-base);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: var(--space-xl);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--space-md);
    justify-content: flex-end;
}

/* Global Search Styles */
.search-modal {
    width: 800px;
}

.search-input-wrapper {
    position: relative;
    margin-bottom: var(--space-xl);
}

.search-input-large {
    width: 100%;
    padding: var(--space-lg) var(--space-xl);
    font-size: 1.125rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.search-input-large:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

.search-filters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.search-results {
    max-height: 400px;
    overflow-y: auto;
}

.search-result-item {
    padding: var(--space-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--bg-primary);
}

.search-result-item:hover {
    border-color: var(--color-primary-500);
    box-shadow: var(--shadow-sm);
}

.search-result-title {
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.search-result-meta {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Dashboard Styles */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.dashboard-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}

.dashboard-card-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary-600);
    margin-bottom: var(--space-sm);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.progress-bar {
    height: 8px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: var(--space-md);
}

.progress-fill {
    height: 100%;
    background: var(--color-primary-500);
    transition: width var(--transition-slow);
}

/* Favorites/Bookmarks */
.bookmark-icon {
    cursor: pointer;
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

.bookmark-icon:hover {
    opacity: 0.8;
}

.bookmark-icon.bookmarked {
    color: var(--color-accent-500);
}

/* Progress Tracking */
.progress-tracker {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.progress-btn {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: all var(--transition-base);
}

.progress-btn:hover {
    border-color: var(--color-primary-500);
}

.progress-btn.active {
    background: var(--color-primary-500);
    color: white;
    border-color: var(--color-primary-500);
}

.progress-btn.solved {
    background: var(--color-success-500);
    color: white;
    border-color: var(--color-success-500);
}

.progress-btn.attempting {
    background: var(--color-accent-500);
    color: white;
    border-color: var(--color-accent-500);
}

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

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

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

/* Remaining original styles from index.html */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md);
}

/* Problem detail view with verification needs more width */
#problemDetailView.main-container {
    max-width: 80vw;
}

.country-selection-wrapper {
    max-width: 100%;
}

.country-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.country-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.country-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.search-box {
    max-width: 500px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

/* Outer container — replaced the old flat grid */
.country-grid-container {
    margin-top: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl, 3rem);
}

.source-section-title {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-400, #94a3b8);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-xs);
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.source-section-title::before {
    content: '';
    display: inline-block;
    width: 3px;
    height: 1em;
    background: var(--color-primary-500, #3b82f6);
    border-radius: 2px;
}

/* Inner card grid */
.country-grid-inner {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-md);
}

/* Legacy alias kept for any code still referencing .country-grid */
.country-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.country-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
}

.country-card:hover {
    border-color: var(--color-primary-500);
    box-shadow: var(--shadow-md);
}

.country-flag {
    font-size: 2.5rem;
    line-height: 1;
    margin-bottom: var(--space-sm);
    display: inline-block;
}

.country-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.country-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.btn-view-toggle {
    padding: var(--space-md) var(--space-xl);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.btn-view-toggle:hover {
    background: var(--bg-primary);
    border-color: var(--color-primary-500);
}

.btn-view-toggle.active {
    background: var(--color-primary-500);
    color: white;
    border-color: var(--color-primary-500);
}

/* ============================================================
   TOPIC TREE — visual redesign
   ============================================================ */

.topic-tree {
    max-width: 1200px;
    margin: 0 auto;
}

/* 2-column grid of subject cards */
.topic-tree-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

/* ── Subject card ── */
.topic-subject-card {
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--bg-secondary);
    transition: box-shadow var(--transition-base);
}

.topic-subject-card:hover {
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.dark-mode .topic-subject-card:hover {
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

/* Coloured top border using the subject color */
.topic-subject-card::before {
    content: '';
    display: block;
    height: 3px;
    background: var(--subject-color);
}

.topic-subject-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 1.1rem;
    cursor: pointer;
    user-select: none;
    gap: var(--space-sm);
}

.topic-subject-header:hover .topic-subject-name {
    color: var(--subject-color);
}

.topic-subject-left {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    min-width: 0;
}

.topic-subject-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: color var(--transition-base);
}

.topic-subject-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.topic-subject-count {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--subject-color);
    background: color-mix(in srgb, var(--subject-color) 12%, transparent);
    padding: 2px 8px;
    border-radius: 999px;
}

.topic-chevron,
.tree-node-chevron {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: transform 0.2s ease;
    display: inline-block;
    line-height: 1;
}

.topic-chevron.rotated,
.tree-node-chevron.rotated {
    transform: rotate(90deg);
}

/* Collapsible body */
.topic-subject-body {
    display: none;
    border-top: 1px solid var(--border-color);
}

.topic-subject-body.expanded {
    display: block;
}

/* ── Tree lines wrapper ── */
.topic-tree-lines {
    padding: 0.4rem 0 0.4rem 0.75rem;
    border-left: 1.5px solid var(--border-color);
    margin-left: 0.75rem;
}

/* ── Tree nodes ── */
.tree-node {
    /* no position relative, no pseudo-elements */
}

.tree-node::before { display: none; }
.tree-node.tree-node-last::before { display: none; }
.tree-row::before { display: none; }

/* ── Tree rows ── */
.tree-row {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 1rem 0.3rem 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-base);
    font-size: 0.875rem;
}

.tree-row:hover {
    background: color-mix(in srgb, var(--subject-color, #3b82f6) 8%, transparent);
}

.tree-row-parent {
    font-weight: 600;
    color: var(--text-primary);
}

.tree-row-leaf {
    color: var(--text-secondary);
}

.tree-row-leaf:hover {
    color: var(--subject-color, var(--color-primary-600));
}

/* Nested children */
.tree-node-children {
    display: none;
    padding-left: 1rem;
    border-left: 1.5px solid var(--border-color);
    margin-left: 0.5rem;
}

.tree-node-children::before { display: none; }

.tree-node-children.expanded {
    display: block;
}

.tree-node-label {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tree-view-all {
    font-style: italic;
    font-size: 0.82rem;
    opacity: 0.8;
}

.tree-node-count {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 2.5rem;
    text-align: right;
}

/* Keep old classes for any remaining references */
.topic-node         { margin-bottom: var(--space-sm); }
.topic-node-header  { display: flex; align-items: center; padding: var(--space-md);
                      background: var(--bg-secondary); border: 1px solid var(--border-color);
                      border-radius: var(--radius-md); cursor: pointer; }
.topic-expand-icon  { margin-right: var(--space-md); font-weight: bold; color: var(--text-secondary); }
.topic-name         { flex: 1; font-weight: 600; color: var(--text-primary); }
.topic-count        { font-size: 0.875rem; padding: var(--space-xs) var(--space-md);
                      background: var(--color-primary-100); color: var(--color-primary-700);
                      border-radius: var(--radius-md); font-weight: 600; }
.topic-children     { margin-left: var(--space-xl); margin-top: var(--space-sm); display: none; }
.topic-children.expanded { display: block; }
.topic-leaf         { padding: var(--space-sm) var(--space-md); margin-bottom: var(--space-xs);
                      background: var(--bg-primary); border: 1px solid var(--border-color);
                      border-radius: var(--radius-md); cursor: pointer;
                      display: flex; justify-content: space-between; align-items: center; }
.topic-leaf:hover   { background: var(--color-primary-50); border-color: var(--color-primary-500); }

/* Problems List View */
.problems-list-wrapper {
    max-width: 100%;
}

.problems-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 2px solid var(--border-color);
}

.btn-back {
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    color: var(--text-primary);
    transition: all var(--transition-base);
}

.btn-back:hover {
    background: var(--bg-primary);
    border-color: var(--color-primary-500);
}

.problems-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    flex: 1;
}

.problems-stats {
    display: flex;
    gap: var(--space-sm);
}

.stat-badge {
    padding: var(--space-sm) var(--space-md);
    background: var(--color-primary-100);
    color: var(--color-primary-700);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
}

.filters-bar {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.filter-select-inline {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.875rem;
    transition: all var(--transition-base);
}

.competition-filter-select {
    width: 240px;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    padding-right: 2rem;
}

.filter-select-inline:focus {
    outline: none;
    border-color: var(--color-primary-500);
    box-shadow: 0 0 0 3px var(--color-primary-50);
}

.problems-grid {
    display: grid;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.problem-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.problem-item:hover {
    border-color: var(--color-primary-500);
    box-shadow: var(--shadow-md);
}

.problem-item-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--space-md);
    gap: var(--space-md);
}

.problem-item-id {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-primary-600);
    font-family: var(--font-mono);
    flex: 1;
}

.problem-item-actions {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.btn-view-problem,
.btn-view-solution,
.btn-view-source {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all var(--transition-base);
}

.btn-view-problem:hover {
    background: var(--color-primary-50);
    border-color: var(--color-primary-500);
    color: var(--color-primary-700);
}

.btn-view-solution {
    background: var(--color-success-50);
    border-color: var(--color-success-500);
    color: var(--color-success-700);
}

.btn-view-solution:hover {
    background: var(--color-success-500);
    border-color: var(--color-success-500);
    color: white;
}

.btn-view-source {
    background: var(--color-primary-50);
    border-color: var(--color-primary-500);
    color: var(--color-primary-700);
}

.btn-view-source:hover {
    background: var(--color-primary-500);
    border-color: var(--color-primary-500);
    color: white;
}

.rating-buttons {
    display: flex;
    gap: var(--space-sm);
    margin-left: auto;
}

.btn-rating {
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.btn-rating:hover {
    opacity: 0.9;
}

.btn-rating-good {
    border-color: var(--color-success-500);
    color: var(--color-success-700);
}

.btn-rating-good:hover {
    background: var(--color-success-50);
}

.btn-rating-good.active {
    background: var(--color-success-500);
    color: white;
}

.btn-rating-bad {
    border-color: var(--color-error-500);
    color: var(--color-error-500);
}

.btn-rating-bad:hover {
    background: var(--color-error-50);
}

.btn-rating-bad.active {
    background: var(--color-error-500);
    color: white;
}

.btn-rating-special {
    border-color: var(--color-accent-500);
    color: var(--color-accent-600);
}

.btn-rating-special:hover {
    background: var(--color-accent-50);
}

.btn-rating-special.active {
    background: var(--color-accent-500);
    color: white;
}

.btn-copy-latex {
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--color-primary-500);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--color-primary-600);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.btn-copy-latex:hover {
    background: var(--color-primary-50);
}

.solution-inline {
    margin-top: var(--space-md);
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    font-size: 1.175rem;
    line-height: 1.85;
    display: none;
}

.solution-inline.visible {
    display: block;
    animation: fadeIn var(--transition-base);
}

.source-inline-panel {
    margin-top: var(--space-md);
    display: none;
}

.source-inline-panel.visible {
    display: block;
    animation: fadeIn var(--transition-base);
}

.solution-inline-header {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--border-color);
}

.problem-item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.problem-item-summary {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-xl);
}

.pagination-btn {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-base);
    min-width: 40px;
}

.pagination-btn:hover:not(:disabled) {
    background: var(--bg-primary);
    border-color: var(--color-primary-500);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-btn.active {
    background: var(--color-primary-500);
    color: white;
    border-color: var(--color-primary-500);
}

/* Problem Card (Detail View) */
.problem-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.problem-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    gap: var(--space-md);
    flex-wrap: wrap;
}

.problem-nav-embedded {
    justify-content: flex-end;
    background: transparent;
    border-bottom: none;
    padding-bottom: 0;
}

.problem-card-embedded {
    box-shadow: var(--shadow-md);
}

.nav-buttons {
    display: flex;
    gap: var(--space-sm);
}

.btn-nav {
    padding: var(--space-sm) var(--space-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-base);
    font-size: 0.875rem;
}

.btn-nav:hover:not(:disabled) {
    background: var(--bg-primary);
    border-color: var(--color-primary-500);
}

.btn-nav:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-nav.random {
    background: var(--color-primary-500);
    color: white;
    border: none;
}

.btn-nav.random:hover {
    background: var(--color-primary-600);
    box-shadow: var(--shadow-sm);
}

.problem-counter {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.problem-header {
    padding: var(--space-xl) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.problem-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    line-height: 1.3;
}

.problem-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.meta-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.difficulty-badge {
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    font-weight: 600;
}

.difficulty-AIME {
    background: var(--color-gray-100);
    color: var(--color-gray-600);
    border: 1px solid var(--border-color);
}

.difficulty-IMO {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
    border: 1px solid var(--border-color);
    font-weight: 700;
}

.difficulty-easy,
.difficulty-Easy {
    background: var(--color-gray-100);
    color: var(--color-success-700);
    border: 1px solid var(--border-color);
}

.difficulty-Hard {
    background: var(--color-gray-100);
    color: var(--color-error-500);
    border: 1px solid var(--border-color);
}

.info-box {
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    border-left: 4px solid;
}

.info-box.summary {
    background: var(--color-primary-50);
    border-color: var(--color-primary-500);
}

.info-box.solution-summary {
    background: var(--color-accent-50);
    border-color: var(--color-accent-500);
}

.info-box-title {
    font-weight: 700;
    margin-bottom: var(--space-sm);
    font-size: 0.875rem;
}

.info-box-content {
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.problem-body {
    padding: var(--space-xl) var(--space-lg);
}

.problem-content {
    font-size: 1.175rem;
    line-height: 1.85;
    color: var(--text-primary);
}

.problem-content p {
    margin-bottom: var(--space-md);
}

.topics-section {
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.topics-header {
    font-size: 0.875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.topics-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.topic-item {
    display: flex;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.topic-item:hover {
    border-color: var(--color-primary-500);
    background: var(--color-primary-50);
}

.topic-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-xs);
    font-size: 0.875rem;
}

.topic-level {
    padding: 0.125rem var(--space-sm);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.topic-level-0 {
    background: var(--color-accent-100);
    color: var(--color-accent-700);
}

.topic-level-1 {
    background: var(--color-primary-100);
    color: var(--color-primary-700);
}

.topic-level-2 {
    background: var(--color-secondary-100);
    color: var(--color-secondary-700);
}

.topic-level-3 {
    background: var(--color-gray-200);
    color: var(--color-gray-700);
}

.topic-separator {
    color: var(--text-secondary);
    font-weight: 400;
}

.solutions-section {
    border-top: 1px solid var(--border-color);
}

.detail-disclosure-section {
    border-top: 1px solid var(--border-color);
}

.detail-disclosure-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1px;
    background: var(--border-color);
}

.detail-toggle-btn {
    flex: 1 1 240px;
    width: auto;
}

.solutions-toggle {
    width: 100%;
    padding: var(--space-lg);
    background: var(--bg-primary);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary-600);
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.solutions-toggle:hover {
    background: var(--color-primary-50);
}

.solutions-content {
    display: none;
    padding: var(--space-lg);
}

.solutions-content.visible {
    display: block;
}

.solution-tabs {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: var(--space-sm);
}

.solution-tab {
    padding: var(--space-sm) var(--space-lg);
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-base);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    position: relative;
}

.solution-tab:hover {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.solution-tab.active {
    color: var(--color-primary-600);
    background: var(--color-primary-50);
}

.solution-tab.active::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary-600);
}

.solution-content {
    display: none;
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    font-size: 1.175rem;
    line-height: 1.85;
}

.solution-content.show {
    display: block;
    animation: fadeIn var(--transition-base);
}

.answer-box {
    margin-top: var(--space-lg);
    padding: var(--space-md);
    background: var(--color-success-50);
    border-left: 4px solid var(--color-success-500);
    border-radius: var(--radius-md);
    font-weight: 600;
    color: var(--text-primary);
}

.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-secondary);
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-radius: 50%;
    border-top-color: var(--color-primary-500);
    animation: spin 1s linear infinite;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .country-grid,
    .country-grid-inner {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .search-modal {
        width: 95vw;
    }
}

@media (max-width: 640px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-actions {
        width: 100%;
    }

    .btn-header {
        flex: 1;
        text-align: center;
    }

    .country-title {
        font-size: 2rem;
    }

    .country-grid,
    .country-grid-inner {
        grid-template-columns: repeat(2, 1fr);
    }

    .problems-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .problems-title {
        font-size: 1.5rem;
    }

    .filters-bar {
        flex-direction: column;
    }

    .filter-select-inline {
        width: 100%;
    }

    .problem-item-actions {
        flex-direction: column;
    }

    .btn-view-problem,
    .btn-view-solution {
        width: 100%;
    }

    .rating-buttons {
        width: 100%;
        margin-left: 0;
    }

    .problem-nav {
        flex-direction: column;
        align-items: stretch;
        flex-wrap: wrap;
        gap: var(--space-sm);
    }

    .nav-buttons {
        width: 100%;
        flex-direction: column;
    }

    .btn-nav {
        width: 100%;
    }

    .solution-tabs {
        flex-wrap: wrap;
    }

    .modal {
        max-width: 95vw;
        max-height: 95vh;
    }

    .problem-card {
        padding: var(--space-md);
        margin: 0;
        border-radius: 0;
    }

    .citation-row {
        grid-template-columns: 90px 1fr;
    }

    .problem-meta {
        flex-wrap: wrap;
    }
}

/* ============================================================================
   TOAST NOTIFICATION SYSTEM
   ============================================================================ */

.toast-container {
    position: fixed;
    top: var(--space-xl);
    right: var(--space-xl);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xl);
    pointer-events: auto;
    animation: toastIn 0.2s ease-out forwards;
    max-width: 400px;
    font-size: 0.9375rem;
    backdrop-filter: blur(12px);
}

.toast.toast-out {
    animation: toastOut 0.25s ease-in forwards;
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    color: var(--text-primary);
    line-height: 1.4;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1rem;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.toast-close:hover {
    color: var(--text-primary);
    background: var(--color-gray-100);
}

.toast-success {
    border-left: 4px solid var(--color-success-500);
}

.toast-error {
    border-left: 4px solid var(--color-error-500);
}

.toast-info {
    border-left: 4px solid var(--color-primary-500);
}

.toast-warning {
    border-left: 4px solid var(--color-accent-500);
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(16px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(16px);
    }
}

/* ============================================================================
   ANIMATED LOADING SCREEN
   ============================================================================ */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading-screen-content {
    text-align: center;
}

.loading-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
}

.loading-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.loading-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
}

.loading-progress-container {
    width: 300px;
    margin: 0 auto;
}

.loading-progress-bar {
    height: 6px;
    background: var(--color-gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-md);
}

.loading-progress-fill {
    height: 100%;
    background: var(--color-primary-500);
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.loading-status {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* loadingPulse and progressShimmer removed — no bouncy animations */

/* ============================================================================
   SCROLL-TO-TOP BUTTON
   ============================================================================ */

.scroll-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--color-primary-500);
    color: white;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    box-shadow: var(--shadow-md);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background: var(--color-primary-600);
}

/* ============================================================================
   ENHANCED SORT & PER-PAGE CONTROLS
   ============================================================================ */

.controls-bar {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.control-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    white-space: nowrap;
}

.per-page-selector {
    display: flex;
    gap: 2px;
    background: var(--color-gray-100);
    border-radius: var(--radius-md);
    padding: 2px;
}

.per-page-btn {
    padding: var(--space-xs) var(--space-sm);
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8125rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    min-width: 36px;
    text-align: center;
}

.per-page-btn:hover {
    color: var(--text-primary);
    background: var(--bg-secondary);
}

.per-page-btn.active {
    background: var(--color-primary-500);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-400);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-500);
}

/* Dark mode scrollbar */
body.dark-mode ::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

body.dark-mode ::-webkit-scrollbar-thumb {
    background: var(--color-gray-600);
}

body.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-500);
}


/* ============================================================================
   VERIFICATION PAGE STYLES - Side-by-Side A4 Layout
   ============================================================================ */

/* Make verification view 80% width */
#verificationView.main-container {
    max-width: 80vw;
    padding: var(--space-md);
}

.verification-wrapper {
    max-width: 100%;
}

.verification-header {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.verification-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.verification-subtitle {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Inline Verification Header (in problem detail page) */
.verification-header-inline {
    text-align: center;
    margin-bottom: var(--space-lg);
    padding: var(--space-lg) 0;
    border-top: 2px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
}

.verification-title-inline {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 var(--space-sm) 0;
}

.verification-subtitle-inline {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Info Bar */
.verification-info-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xl);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-primary-50);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    border-left: 4px solid var(--color-primary-500);
}

body.dark-mode .verification-info-bar {
    background: var(--color-gray-800);
}

.verification-info-bar .info-item {
    display: flex;
    gap: var(--space-sm);
    align-items: baseline;
}

.verification-info-bar .info-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.verification-info-bar .info-value {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--color-primary-600);
    font-family: var(--font-mono);
}

/* Comparison Section */
.comparison-section {
    margin-bottom: var(--space-2xl);
}

.comparison-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-primary-500);
}

.side-by-side-container {
    display: grid;
    grid-template-columns: 1.5fr 1.5fr 1fr;
    gap: var(--space-lg);
    height: calc(100vh - 250px);
    min-height: 800px;
}

/* Panel Styles */
.jpg-panel,
.source-panel,
.parsed-panel {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-color);
    overflow: hidden;
}

.source-panel {
    border-color: var(--color-accent-500);
}

.parsed-panel {
    border-color: var(--color-success-500);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-gray-100);
    border-bottom: 2px solid var(--border-color);
    flex-shrink: 0;
}

body.dark-mode .panel-header {
    background: var(--color-gray-800);
}

.source-panel .panel-header {
    background: var(--color-accent-50);
    border-bottom-color: var(--color-accent-500);
}

body.dark-mode .source-panel .panel-header {
    background: var(--color-gray-800);
}

.parsed-panel .panel-header {
    background: var(--color-success-50);
    border-bottom-color: var(--color-success-500);
}

body.dark-mode .parsed-panel .panel-header {
    background: var(--color-gray-800);
}

.panel-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-xl);
    background: white;
    position: relative;
}

body.dark-mode .panel-content {
    background: var(--color-gray-900);
}

/* Page Navigation */
.page-navigation {
    display: flex;
    gap: var(--space-xs);
}

.page-nav-btn {
    padding: var(--space-xs) var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: white;
    color: var(--text-primary);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.page-nav-btn:hover {
    background: var(--color-gray-100);
    border-color: var(--color-primary-500);
}

.page-nav-btn.active {
    background: var(--color-primary-500);
    color: white;
    border-color: var(--color-primary-500);
}

.no-source-note {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Source Pages */
.source-page {
    display: none;
    animation: fadeIn var(--transition-base);
}

.source-page.active {
    display: block;
}

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    gap: var(--space-md);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-gray-200);
    border-radius: 50%;
    border-top-color: var(--color-primary-500);
    animation: spin 1s linear infinite;
}

/* Markdown Source Content */
.markdown-source {
    font-size: 0.9375rem;
    line-height: 1.8;
    color: var(--text-primary);
}

.markdown-source .md-h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--border-color);
}

.markdown-source .md-h2:first-child {
    margin-top: 0;
}

.markdown-source .md-h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-md);
}

.markdown-source .md-h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
}

.markdown-source p {
    margin-bottom: var(--space-md);
}

/* Source Images */
.source-image {
    max-width: 100%;
    height: auto;
    margin: var(--space-lg) 0;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

/* Page JPG Container */
.page-jpg-container {
    position: relative;
    padding: var(--space-sm);
    background: var(--bg-primary);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.page-jpg {
    max-width: 100%;
    max-height: 100%;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
    object-fit: contain;
}

.btn-flip-image {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    padding: var(--space-xs) var(--space-md);
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid var(--color-primary-500);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-primary-600);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-md);
}

.btn-flip-image:hover {
    background: var(--color-primary-500);
    color: white;
}

body.dark-mode .btn-flip-image {
    background: rgba(30, 41, 59, 0.95);
    color: var(--color-primary-400);
    border-color: var(--color-primary-400);
}

body.dark-mode .btn-flip-image:hover {
    background: var(--color-primary-600);
    color: white;
}

/* Solution Block */
.solution-block {
    margin-bottom: var(--space-lg);
}

.solution-block + .solution-block {
    padding-top: var(--space-lg);
    border-top: 1px dashed var(--border-color);
}

.solution-number {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-primary-600);
    margin-bottom: var(--space-md);
}

/* Error States */
.error-message {
    padding: var(--space-xl);
    background: var(--color-error-50);
    border-radius: var(--radius-md);
    text-align: center;
}

.error-message p {
    color: var(--color-error-500);
    margin-bottom: var(--space-sm);
}

.error-detail {
    font-size: 0.875rem;
    font-weight: 600;
}

.file-path {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-gray-600);
}

.no-source-message {
    padding: var(--space-2xl);
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 1400px) {
    .side-by-side-container {
        grid-template-columns: 1fr;
        height: auto;
        min-height: 0;
    }

    .source-panel,
    .parsed-panel {
        min-height: 600px;
    }
}

@media (max-width: 640px) {
    .verification-info-bar {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .comparison-title {
        font-size: 1.125rem;
    }

    .panel-content {
        padding: var(--space-md);
    }

    .page-navigation {
        flex-wrap: wrap;
    }
}

/* Country card decorations removed — clean flat cards */

/* ============================================================================
   ENHANCED MODAL STYLES
   ============================================================================ */

.modal-overlay {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal-large {
    width: 900px;
    max-width: 95vw;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    background: var(--bg-secondary);
    animation: modalEnter 0.15s ease-out;
}

.modal-large .modal-header {
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-large .modal-body {
    padding: var(--space-xl);
    overflow-y: auto;
    flex: 1;
}

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

/* Header overrides removed — flat header defined above */

/* ============================================================================
   DASHBOARD CHART STYLES
   ============================================================================ */

.stat-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card:hover {
    border-color: var(--color-primary-500);
}

.stat-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.chart-container {
    margin-top: var(--space-xl);
    padding: var(--space-xl);
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
}

.chart-container h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.bar-item {
    display: grid;
    grid-template-columns: 140px 1fr 120px;
    align-items: center;
    gap: var(--space-md);
}

.bar-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: right;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.bar-track {
    height: 24px;
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    background: var(--color-primary-500);
    border-radius: var(--radius-full);
    transition: width 0.3s ease-out;
    min-width: 4px;
}

.bar-value {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.rating-stats {
    display: flex;
    gap: var(--space-xl);
    justify-content: center;
}

.rating-stat-item {
    text-align: center;
    padding: var(--space-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    min-width: 100px;
}

.rating-stat-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.rating-stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary-600);
}

.rating-stat-label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: var(--space-xs);
}

/* ============================================================================
   SEARCH ENHANCEMENTS
   ============================================================================ */

.search-results-header {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-color);
}

.search-result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.search-result-snippet {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-top: var(--space-sm);
}

.search-kbd-hint {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-left: var(--space-sm);
}

kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.125rem 0.375rem;
    font-size: 0.6875rem;
    font-family: var(--font-mono);
    background: var(--color-gray-100);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    line-height: 1;
    color: var(--text-secondary);
}

/* ============================================================================
   FAVORITES & DATA MANAGEMENT ENHANCEMENTS
   ============================================================================ */

.favorites-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.favorite-item {
    padding: var(--space-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    transition: all var(--transition-base);
}

.favorite-item:hover {
    border-color: var(--color-primary-500);
    box-shadow: var(--shadow-sm);
}

.favorite-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-sm);
}

.favorite-meta {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.btn-icon {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

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

.btn-primary {
    padding: var(--space-sm) var(--space-lg);
    background: var(--color-primary-500);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.875rem;
}

.btn-primary:hover {
    background: var(--color-primary-600);
}

.btn-secondary {
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.875rem;
}

.btn-secondary:hover {
    border-color: var(--color-primary-500);
    background: var(--color-primary-50);
}

.btn-danger {
    padding: var(--space-sm) var(--space-lg);
    background: var(--color-error-500);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 0.875rem;
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--space-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    line-height: 1;
}

.btn-close:hover {
    color: var(--text-primary);
    background: var(--color-gray-100);
}

.data-stats {
    padding: var(--space-lg);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--space-xl);
}

.data-stats p {
    margin-bottom: var(--space-sm);
    font-size: 0.9375rem;
}

.data-stats p:last-child {
    margin-bottom: 0;
}

.data-actions {
    padding: var(--space-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
}

.data-actions h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.data-actions p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.data-actions button {
    margin-right: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.danger-zone {
    border-color: var(--color-error-500);
    background: var(--color-error-50);
}

body.dark-mode .danger-zone {
    background: rgba(239, 68, 68, 0.05);
}

body.dark-mode .country-count {
    background: rgba(99, 102, 241, 0.15);
}

body.dark-mode kbd {
    background: var(--color-gray-200);
    border-color: var(--color-gray-300);
    color: var(--text-primary);
}

/* ============================================================================
   FOCUS & ACCESSIBILITY IMPROVEMENTS
   ============================================================================ */

*:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

.btn-header:focus-visible,
.btn-nav:focus-visible,
.btn-view-toggle:focus-visible,
.pagination-btn:focus-visible {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
}

/* ============================================================================
   BOOKMARK BUTTON IN DETAIL VIEW
   ============================================================================ */

.bookmark-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-base);
    color: var(--text-secondary);
}

.bookmark-btn:hover {
    border-color: var(--color-accent-500);
    color: var(--color-accent-600);
    background: var(--color-accent-50);
}

.bookmark-btn.bookmarked {
    border-color: var(--color-accent-500);
    background: var(--color-accent-500);
    color: white;
}

/* Problem item accent line removed — clean flat items */

/* ============================================================================
   PAGE TRANSITION
   ============================================================================ */

.main-container {
    animation: pageEnter 0.3s ease;
}

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

/* ============================================================================
   RESPONSIVE TOAST
   ============================================================================ */

@media (max-width: 640px) {
    .toast-container {
        top: auto;
        bottom: var(--space-xl);
        right: var(--space-md);
        left: var(--space-md);
    }

    .toast {
        max-width: 100%;
    }

    .scroll-to-top {
        bottom: var(--space-lg);
        right: var(--space-lg);
        width: 44px;
        height: 44px;
    }

    .bar-item {
        grid-template-columns: 100px 1fr 80px;
        gap: var(--space-sm);
    }

    .bar-label {
        font-size: 0.75rem;
    }

    .bar-value {
        font-size: 0.75rem;
    }
}

/* ============================================================================
   LLM SOLUTIONS
   ============================================================================ */

.llm-solutions-section {
    border-top: 2px solid var(--color-primary-200);
    margin-top: var(--space-xl);
}

.llm-solutions-toggle {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: #e2e8f0;
    border: none;
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-xl);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    transition: background 0.2s;
}

.llm-solutions-toggle:hover {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

.llm-disclaimer {
    background: #fef9ec;
    border-left: 4px solid #f59e0b;
    color: #92400e;
    padding: var(--space-sm) var(--space-md);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.85rem;
    margin-bottom: var(--space-lg);
}

.dark-mode .llm-disclaimer {
    background: #292524;
    border-left-color: #d97706;
    color: #fcd34d;
}

.llm-model-tabs {
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.llm-model-tabs .solution-tab {
    font-size: 0.78rem;
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
}

.llm-model-tabs .solution-tab.active {
    background: var(--color-primary-700);
    color: white;
    border-color: var(--color-primary-700);
}

.dark-mode .llm-model-tabs .solution-tab {
    background: var(--color-gray-700);
    border-color: var(--color-gray-600);
    color: var(--color-gray-200);
}

.dark-mode .llm-model-tabs .solution-tab.active {
    background: var(--color-primary-500);
    border-color: var(--color-primary-500);
    color: white;
}

.llm-model-label {
    display: inline-block;
    background: var(--color-gray-700);
    color: var(--color-gray-100);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
    letter-spacing: 0.02em;
}

/* LLM badge in list view */
.llm-badge {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: #e2e8f0;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 999px;
    letter-spacing: 0.03em;
    cursor: default;
    user-select: none;
}

/* ============================================================================
   CITATION BLOCK
   ============================================================================ */

.citation-block {
    margin-top: var(--space-md);
    border: 1px solid var(--color-gray-200, #e2e8f0);
    border-radius: var(--radius-md, 8px);
    overflow: hidden;
    font-size: 0.875rem;
}

.dark-mode .citation-block {
    border-color: rgba(255,255,255,0.12);
}

/* Header bar */
.citation-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: var(--color-primary, #3b82f6);
    color: #fff;
}

.citation-source-badge {
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.01em;
}

.citation-header-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.8;
}

/* Body: rows */
.citation-body {
    background: var(--color-gray-50, #f8fafc);
}

.dark-mode .citation-body {
    background: rgba(255,255,255,0.03);
}

.citation-row {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    border-bottom: 1px solid var(--color-gray-100, #f1f5f9);
    line-height: 1.5;
}

.dark-mode .citation-row {
    border-bottom-color: rgba(255,255,255,0.06);
}

.citation-row:last-child {
    border-bottom: none;
}

/* Alternating rows */
.citation-row:nth-child(even) {
    background: var(--color-gray-100, #f1f5f9);
}

.dark-mode .citation-row:nth-child(even) {
    background: rgba(255,255,255,0.05);
}

.citation-field-label {
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-500, #64748b);
    padding-top: 0.1rem;
}

.dark-mode .citation-field-label {
    color: var(--color-gray-400, #94a3b8);
}

.citation-field-value {
    color: var(--color-gray-700, #334155);
}

.dark-mode .citation-field-value {
    color: var(--color-gray-200, #e2e8f0);
}

/* ============================================================================
   EXPLORER REDESIGN — matches landing page aesthetic
   ============================================================================ */

/* ── Site Header (mirrors landing page nav) ─────────────────────────────── */
.site-header {
    background: #fff;
    border-bottom: 1px solid var(--border-color);
    padding: 0.65rem var(--space-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.dark-mode .site-header {
    background: var(--bg-secondary);
}

.site-header-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.site-brand {
    font-family: 'Computer Modern', 'Latin Modern', Georgia, serif;
    font-variant: small-caps;
    font-weight: 400;
    font-size: 1.1rem;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 7px;
    letter-spacing: 0.01em;
}

.site-brand img {
    height: 22px;
    width: auto;
}

.dark-mode .site-brand {
    color: var(--color-gray-100);
}

.site-nav-links {
    display: flex;
    gap: 4px;
    align-items: center;
    flex-wrap: wrap;
}

.site-nav-links a {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 5px 10px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: border-color 120ms, color 120ms;
}

.site-nav-links a:hover {
    color: var(--text-primary);
    border-color: var(--border-color);
}

.nav-btn {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    background: transparent;
    padding: 5px 10px;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: border-color 120ms, color 120ms;
    font-family: var(--font-sans);
}

.nav-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-color);
}

.nav-btn kbd {
    font-size: 0.7rem;
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-300);
    border-radius: 3px;
    padding: 1px 4px;
    margin-left: 4px;
    font-family: var(--font-mono);
    color: var(--text-secondary);
}

/* ── View container (replaces main-container) ───────────────────────────── */
.view-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md) var(--space-2xl);
}

/* ── Explorer hero ───────────────────────────────────────────────────────── */
.explorer-hero {
    text-align: center;
    padding: var(--space-xl) 0 var(--space-lg);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--space-xl);
}

.explorer-hero-title {
    font-family: 'Computer Modern', 'Latin Modern', Georgia, serif;
    font-variant: small-caps;
    font-weight: 400;
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    letter-spacing: 0.01em;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.explorer-hero-sub {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.hero-stat {
    font-weight: 600;
    color: var(--text-primary);
}

/* ── View toggle ─────────────────────────────────────────────────────────── */
.view-toggle-row {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.view-toggle-btn {
    padding: 7px 20px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 150ms ease-out;
    font-family: var(--font-sans);
}

.view-toggle-btn:hover {
    border-color: var(--color-gray-400);
    color: var(--text-primary);
}

.view-toggle-btn.active {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: #fff;
}

/* ── Selection section ───────────────────────────────────────────────────── */
.selection-section {
    margin-top: var(--space-md);
}

.selection-header {
    text-align: center;
    margin-bottom: var(--space-xl);
}

.selection-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.selection-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ── Country grid ────────────────────────────────────────────────────────── */
.country-grid-container {
    width: 100%;
}

.source-section {
    margin-bottom: var(--space-2xl);
}

.source-section-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border-color);
}

.country-grid-inner {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--space-md);
}

/* Country card — elegant, matches paper's figure boxes */
.country-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg) var(--space-md);
    cursor: pointer;
    text-align: center;
    transition: border-color 150ms, box-shadow 150ms, transform 150ms;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.country-card:hover {
    border-color: var(--color-gray-400);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.country-flag {
    font-size: 2rem;
    line-height: 1;
}

.source-card-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
    display: block;
}

.source-inline-logo {
    width: 1.1em;
    height: 1.1em;
    object-fit: contain;
    display: inline-block;
    vertical-align: -0.18em;
}

.country-name {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
}

.country-count {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ── Loading inline (inside views while data loads) ─────────────────────── */
.loading-inline {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    justify-content: center;
    padding: var(--space-2xl);
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ── Problems list header ────────────────────────────────────────────────── */
.problems-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.problems-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
    min-width: 120px;
}

.stat-pill {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    background: var(--color-gray-100);
    border-radius: 999px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.dark-mode .stat-pill {
    background: var(--color-gray-200);
}

/* ── Controls bar ────────────────────────────────────────────────────────── */
.controls-bar {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.controls-bar-bottom {
    justify-content: flex-end;
    margin-top: var(--space-md);
}

/* ── Loading screen (redesigned) ─────────────────────────────────────────── */
.loading-screen {
    position: fixed;
    inset: 0;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.4s ease-out;
}

.dark-mode .loading-screen {
    background: #1e1e1e;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-screen-content {
    text-align: center;
    max-width: 340px;
    padding: var(--space-xl);
}

.loading-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: 'Computer Modern', 'Latin Modern', Georgia, serif;
    font-variant: small-caps;
    font-size: 1.75rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    letter-spacing: 0.02em;
}

.loading-brand img {
    width: 1.9rem;
    height: 1.9rem;
    object-fit: contain;
}

.loading-title {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.loading-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

.loading-progress-container {
    width: 100%;
}

.loading-progress-bar {
    height: 2px;
    background: var(--color-gray-200);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.loading-progress-fill {
    height: 100%;
    background: var(--text-primary);
    border-radius: 999px;
    transition: width 0.3s ease-out;
}

.loading-status {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ── Detail wrapper ──────────────────────────────────────────────────────── */
.detail-wrapper {
    max-width: 860px;
    margin: 0 auto;
}

/* ── Problems list wrapper ───────────────────────────────────────────────── */
.problems-list-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

/* ── Preview text (lightweight search records) ───────────────────────────── */
.problem-preview-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

/* ── Dark mode adjustments for new elements ─────────────────────────────── */
.dark-mode .country-card {
    background: var(--bg-secondary);
}

.dark-mode .view-toggle-btn.active {
    background: var(--color-gray-700);
    border-color: var(--color-gray-700);
    color: var(--color-gray-100);
}

.dark-mode .nav-btn kbd {
    background: var(--color-gray-200);
    border-color: var(--color-gray-300);
}

/* ── Problem card source row ─────────────────────────────────────────────── */
.problem-item-source {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem 0.35rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.source-flag-name {
    font-weight: 500;
    color: var(--text-primary);
}

.source-sep {
    color: var(--color-gray-400);
    user-select: none;
}

.source-competition {
    color: var(--text-secondary);
}

.source-year {
    color: var(--text-secondary);
}

.comp-truncated {
    cursor: pointer;
    color: var(--text-secondary);
}

.comp-truncated:hover {
    color: var(--text-primary);
}

.show-more-ellipsis {
    color: var(--color-gray-400);
    font-style: italic;
}

/* ── Problem card body (clickable preview area) ──────────────────────────── */
.problem-item-body {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    cursor: pointer;
    border-left: 2px solid var(--color-gray-200);
    padding-left: 0.75rem;
    transition: border-color 0.15s ease;
}

.problem-item-body:hover {
    border-left-color: var(--color-gray-400);
}

.dark-mode .problem-item-body {
    border-left-color: var(--color-gray-700);
}

.dark-mode .problem-item-body:hover {
    border-left-color: var(--color-gray-500);
}

/* ── Explorer subheader ──────────────────────────────────────────────────── */
.explorer-subheader {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-sm);
    max-width: 960px;
    margin: 0 auto var(--space-lg);
    padding: 0 var(--space-md);
}

.explorer-subheader-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-family: 'Computer Modern', 'Latin Modern', Georgia, serif;
    letter-spacing: 0.01em;
}

.explorer-subheader-note {
    white-space: nowrap;
}

@media (max-width: 900px) {
    .explorer-subheader-note {
        display: none;
    }
}

/* ── Explorer footer ─────────────────────────────────────────────────────── */
.explorer-footer {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    padding: var(--space-xl) var(--space-md);
    border-top: 1px solid var(--color-gray-200);
    margin-top: var(--space-xl);
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
}

.explorer-footer a {
    color: var(--text-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.explorer-footer a:hover {
    opacity: 0.7;
}

.dark-mode .explorer-footer {
    border-top-color: var(--color-gray-700);
}