/* ── Google Font ──────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ── CSS variables — light mode (default) ────────────────────────────────── */
:root {
    --sidebar-bg: #F8FAFC;
    --sidebar-border: #E2E8F0;
    --sidebar-label: #64748B;
    --sidebar-text: #374151;
    --sidebar-input-bg: #FFFFFF;
    --sidebar-input-border: #E2E8F0;
    --sidebar-input-text: #0F172A;
    --sidebar-divider: #E2E8F0;
    --sidebar-btn-border: #CBD5E1;
    --sidebar-btn-text: #64748B;
    --sidebar-btn-hover-bg: #F1F5F9;
    --footer-bg: #F8FAFC;
    --footer-border: #E2E8F0;
    --footer-text: #94A3B8;
    /* Dropdowns */
    --dd-bg: #FFFFFF;
    --dd-border: #E2E8F0;
    --dd-text: #0F172A;
    --dd-placeholder: #94A3B8;
    --dd-option-bg: #FFFFFF;
    --dd-option-text: #374151;
    --dd-option-hover-bg: #F1F5F9;
    --dd-option-hover-text: #0F172A;
    --dd-option-selected-bg: #2563EB;
    --dd-shadow: rgba(0, 0, 0, 0.08);
    --dd-arrow: #94A3B8;
    --dd-open-border: #2563EB;
    --dd-noresults: #94A3B8;
    --dd-noresults-bg: #FFFFFF;
    --dd-clear: #94A3B8;
    /* Checklist */
    --checklist-text: #374151;
    --checklist-hover: #0F172A;
    /* Main content */
    --main-bg: #F8FAFC;
    --card-bg: #FFFFFF;
    --card-border: #E2E8F0;
    --panel-border: #F1F5F9;
    --stat-value: #0F172A;
    --stat-label: #94A3B8;
    --chart-title: #0F172A;
    --chart-subtitle: #94A3B8;
    --badge-bg: #EFF6FF;
    --badge-text: #2563EB;
    --plotly-bg: #FFFFFF;
    --plotly-grid: #F1F5F9;
    --plotly-line: #E2E8F0;
    --plotly-tick: #94A3B8;
    --table-header-bg: #F8FAFC;
    --table-header-text: #0F172A;
    --table-row-odd: #FFFFFF;
    --table-row-even: #F8FAFC;
    --table-text: #0F172A;
    --table-text-secondary: #475569;
    --table-line: #F1F5F9;
}

/* ── CSS variables — dark mode ───────────────────────────────────────────── */
body.dark-mode {
    --sidebar-bg: #1E293B;
    --sidebar-border: #2D3F55;
    --sidebar-label: #94A3B8;
    --sidebar-text: #CBD5E1;
    --sidebar-input-bg: #263548;
    --sidebar-input-border: #3B526E;
    --sidebar-input-text: #F1F5F9;
    --sidebar-divider: #2D3F55;
    --sidebar-btn-border: #3B526E;
    --sidebar-btn-text: #64748B;
    --sidebar-btn-hover-bg: #263548;
    --footer-bg: #1A2638;
    --footer-border: #2D3F55;
    --footer-text: #64748B;
    /* Dropdowns */
    --dd-bg: #263548;
    --dd-border: #3B526E;
    --dd-text: #F1F5F9;
    --dd-placeholder: #94A3B8;
    --dd-option-bg: #263548;
    --dd-option-text: #CBD5E1;
    --dd-option-hover-bg: #2F4260;
    --dd-option-hover-text: #F1F5F9;
    --dd-option-selected-bg: #1D4ED8;
    --dd-shadow: rgba(0, 0, 0, 0.3);
    --dd-arrow: #64748B;
    --dd-open-border: #2563EB;
    --dd-noresults: #64748B;
    --dd-noresults-bg: #263548;
    --dd-clear: #64748B;
    /* Checklist */
    --checklist-text: #CBD5E1;
    --checklist-hover: #F1F5F9;
    /* Main content */
    --main-bg: #1A2638;
    --card-bg: #223043;
    --card-border: #2D3F55;
    --panel-border: #2D3F55;
    --stat-value: #F1F5F9;
    --stat-label: #64748B;
    --chart-title: #F1F5F9;
    --chart-subtitle: #64748B;
    --badge-bg: #1E3A5F;
    --badge-text: #60A5FA;
    --plotly-bg: #223043;
    --plotly-grid: #2D3F55;
    --plotly-line: #2D3F55;
    --plotly-tick: #64748B;
    --table-header-bg: #1A2638;
    --table-header-text: #F1F5F9;
    --table-row-odd: #223043;
    --table-row-even: #273A52;
    --table-text: #F1F5F9;
    --table-text-secondary: #94A3B8;
    --table-line: #2D3F55;
}

/* ── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--main-bg);
    color: var(--stat-value);
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* ── Sidebar Dropdown (themed) ───────────────────────────────────────────── */
.dark-dropdown .Select-control {
    background-color: var(--dd-bg) !important;
    border: 1px solid var(--dd-border) !important;
    border-radius: 8px !important;
    color: var(--dd-text) !important;
    min-height: 36px !important;
    box-shadow: none !important;
    font-size: 13px !important;
    font-family: 'Inter', sans-serif !important;
}

.dark-dropdown .Select-control:hover {
    border-color: var(--dd-border) !important;
    filter: brightness(0.96);
}

.dark-dropdown.is-open .Select-control {
    border-radius: 8px 8px 0 0 !important;
    border-color: var(--dd-open-border) !important;
}

.dark-dropdown .Select-placeholder,
.dark-dropdown .Select-value-label {
    color: var(--dd-placeholder) !important;
    font-size: 13px !important;
    line-height: 36px !important;
}

.dark-dropdown .Select-value-label {
    color: var(--dd-text) !important;
}

.dark-dropdown .Select-arrow-zone .Select-arrow {
    border-top-color: var(--dd-arrow) !important;
}

.dark-dropdown .Select-menu-outer {
    background-color: var(--dd-bg) !important;
    border: 1px solid var(--dd-border) !important;
    border-top: none !important;
    border-radius: 0 0 8px 8px !important;
    box-shadow: 0 8px 24px var(--dd-shadow) !important;
    z-index: 1000 !important;
}

.dark-dropdown .Select-option {
    background-color: var(--dd-option-bg) !important;
    color: var(--dd-option-text) !important;
    font-size: 13px !important;
    padding: 8px 12px !important;
    font-family: 'Inter', sans-serif !important;
}

.dark-dropdown .Select-option:hover,
.dark-dropdown .Select-option.is-focused {
    background-color: var(--dd-option-hover-bg) !important;
    color: var(--dd-option-hover-text) !important;
}

.dark-dropdown .Select-option.is-selected {
    background-color: var(--dd-option-selected-bg) !important;
    color: #FFFFFF !important;
}

.dark-dropdown .Select-input input {
    color: var(--dd-text) !important;
    font-size: 13px !important;
    font-family: 'Inter', sans-serif !important;
}

.dark-dropdown .Select-noresults {
    color: var(--dd-noresults) !important;
    font-size: 12px !important;
    background-color: var(--dd-noresults-bg) !important;
}

.dark-dropdown .Select-clear {
    color: var(--dd-clear) !important;
}

.dark-dropdown .Select-clear:hover {
    color: var(--dd-arrow) !important;
}

.dark-dropdown.is-disabled {
    opacity: 0.4 !important;
    cursor: not-allowed !important;
    pointer-events: none !important;
}

/* ── Virtualized select options ───────────────────────────────────────────── */
.dark-dropdown .VirtualizedSelectOption {
    background-color: var(--dd-option-bg) !important;
    color: var(--dd-option-text) !important;
    font-size: 13px !important;
    font-family: 'Inter', sans-serif !important;
    cursor: pointer !important;
}

.dark-dropdown .VirtualizedSelectFocusedOption {
    background-color: var(--dd-option-hover-bg) !important;
    color: var(--dd-option-hover-text) !important;
}

.dark-dropdown .VirtualizedSelectSelectedOption {
    background-color: var(--dd-option-selected-bg) !important;
    color: #FFFFFF !important;
}

.dark-dropdown .VirtualizedSelectDisabledOption {
    color: var(--dd-arrow) !important;
    background-color: var(--dd-option-bg) !important;
}

/* ── Sidebar checklist ────────────────────────────────────────────────────── */
.sidebar-checklist label {
    display: flex !important;
    align-items: center !important;
    gap: 8px !important;
    padding: 4px 0 !important;
    cursor: pointer !important;
    font-size: 12px !important;
    color: var(--checklist-text) !important;
    transition: color 0.15s ease;
}

.sidebar-checklist label:hover {
    color: var(--checklist-hover) !important;
}

/* ── Census range slider (light background, below chart) ──────────────────── */
.census-slider .rc-slider-track {
    background-color: #94A3B8 !important;
}

.census-slider .rc-slider-handle {
    border-color: #94A3B8 !important;
    background-color: #94A3B8 !important;
    box-shadow: none !important;
}

.census-slider .rc-slider-handle:hover,
.census-slider .rc-slider-handle:active {
    border-color: #64748B !important;
    box-shadow: 0 0 0 4px rgba(100, 116, 139, 0.2) !important;
}

.census-slider .rc-slider-rail {
    background-color: #E2E8F0 !important;
}

.census-slider .rc-slider-mark-text {
    color: #64748B !important;
    font-size: 11px !important;
    font-family: 'Inter', sans-serif !important;
}

/* ── Scrollbar (sidebar) ──────────────────────────────────────────────────── */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #CBD5E1;
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: #94A3B8;
}
body.dark-mode ::-webkit-scrollbar-thumb {
    background: #334155;
}
body.dark-mode ::-webkit-scrollbar-thumb:hover {
    background: #475569;
}

/* ── Details/Summary (accordion) ─────────────────────────────────────────── */
details > summary {
    list-style: none;
    user-select: none;
}

details > summary::-webkit-details-marker {
    display: none;
}

details > summary::before {
    content: '▸ ';
    color: #475569;
    font-size: 10px;
    transition: transform 0.15s ease;
}

details[open] > summary::before {
    content: '▾ ';
}

/* ── Search input focus ───────────────────────────────────────────────────── */
#search-bar:focus {
    border-color: #2563EB !important;
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* ── Reset button hover ───────────────────────────────────────────────────── */
#btn-reset:hover {
    border-color: var(--sidebar-input-border) !important;
    color: var(--sidebar-text) !important;
    background-color: var(--sidebar-btn-hover-bg) !important;
}

/* ── Export button hover ──────────────────────────────────────────────────── */
#btn-csv:hover {
    border-color: #475569 !important;
    color: #CBD5E1 !important;
    background-color: #1E293B !important;
    transition: all 0.15s ease;
}

/* ── Theme toggle button ──────────────────────────────────────────────────── */
#theme-toggle:hover {
    opacity: 0.7;
}
/* Sun ☀ is a text symbol — give it a warm golden color in dark mode */
body.dark-mode #theme-toggle {
    color: #FBBF24;
}

/* ── Graph container fill ─────────────────────────────────────────────────── */
#graph-container .js-plotly-plot,
#graph-container .plot-container {
    height: 100% !important;
}

#graph-container .dash-graph {
    height: 100% !important;
}

/* ── Plotly modebar ───────────────────────────────────────────────────────── */
.modebar {
    background: transparent !important;
}

.modebar-btn path {
    fill: #94A3B8 !important;
}

.modebar-btn:hover path {
    fill: #0F172A !important;
}

/* ── Navigation links ─────────────────────────────────────────────────────── */
.nav-link {
    color: #94A3B8;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: 6px;
    transition: color 0.15s ease, background-color 0.15s ease;
    font-family: 'Inter', sans-serif;
}

.nav-link:hover {
    color: #F1F5F9;
    background-color: #1E293B;
}

/* ── Back link ────────────────────────────────────────────────────────────── */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: #475569;
    text-decoration: none;
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 24px;
    padding: 5px 12px;
    border-radius: 8px;
    background: #F1F5F9;
    border: 1px solid #E2E8F0;
    transition: all 0.15s ease;
}

.back-link:hover {
    background: #E2E8F0;
    color: #0F172A;
    border-color: #CBD5E1;
}

body.dark-mode .back-link {
    background: #263548;
    border-color: #2D3F55;
    color: #94A3B8;
}

body.dark-mode .back-link:hover {
    background: #2F4260;
    color: #F1F5F9;
    border-color: #3B526E;
}

/* ── Home link (top bar title) ───────────────────────────────────────────── */
.home-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #F1F5F9;
    padding: 6px 10px;
    border-radius: 8px;
    transition: background 0.15s ease;
}
.home-link:hover {
    background: #1E293B;
    color: #FFFFFF;
}

/* ── Page layout (About / Publications / Contact) ─────────────────────────── */
.page-container {
    flex: 1;
    overflow-y: auto;
    padding: 48px max(32px, calc(50% - 400px));
    background-color: var(--main-bg);
    display: block;
}

.page-card {
    background: #FFFFFF;
    border: 1px solid #E2E8F0;
    border-radius: 16px;
    padding: 48px 56px;
    width: 100%;
    max-width: 800px;
    height: fit-content;
}

.page-title {
    font-size: 28px;
    font-weight: 700;
    color: #0F172A;
    letter-spacing: -0.03em;
    margin: 0 0 6px 0;
}

.page-subtitle {
    font-size: 15px;
    color: #64748B;
    margin: 0 0 24px 0;
}

.page-divider {
    border: none;
    border-top: 1px solid #E2E8F0;
    margin: 0 0 32px 0;
}

.page-text {
    font-size: 14px;
    line-height: 1.7;
    color: #475569;
    margin: 0 0 24px 0;
}

.section-title {
    font-size: 16px;
    font-weight: 600;
    color: #0F172A;
    margin: 32px 0 12px 0;
    letter-spacing: -0.01em;
}

.page-list {
    font-size: 14px;
    line-height: 1.7;
    color: #475569;
    padding-left: 20px;
    margin: 0 0 24px 0;
}

.page-list li {
    margin-bottom: 8px;
}

.inline-link {
    color: #2563EB;
    text-decoration: none;
    font-weight: 500;
}

.inline-link:hover {
    text-decoration: underline;
}

/* ── Dark mode overrides — static pages ──────────────────────────────────── */
body.dark-mode .page-card {
    background: var(--card-bg);
    border-color: var(--card-border);
}
body.dark-mode .page-title,
body.dark-mode .section-title {
    color: var(--chart-title);
}
body.dark-mode .page-subtitle,
body.dark-mode .page-text,
body.dark-mode .page-list {
    color: var(--chart-subtitle);
}
body.dark-mode .page-divider {
    border-color: var(--panel-border);
}
body.dark-mode .info-block {
    background: var(--main-bg);
    border-color: var(--card-border);
}
body.dark-mode .info-label { color: var(--sidebar-label); }
body.dark-mode .info-value { color: var(--chart-title); }
body.dark-mode .pub-card {
    background: var(--main-bg);
    border-color: var(--card-border);
}
body.dark-mode .pub-title   { color: var(--chart-title); }
body.dark-mode .pub-authors { color: var(--chart-subtitle); }
body.dark-mode .pub-venue,
body.dark-mode .pub-details,
body.dark-mode .pub-doi     { color: var(--sidebar-label); }
body.dark-mode .data-card {
    background: var(--main-bg);
    border-color: var(--card-border);
}
body.dark-mode .data-card-title { color: var(--chart-title); }
body.dark-mode .data-card-subtitle { color: var(--sidebar-label); }
body.dark-mode .data-card-desc  { color: var(--chart-subtitle); }
body.dark-mode .data-link-row {
    background: var(--card-bg);
    border-color: var(--card-border);
}
body.dark-mode .data-link-label { color: var(--chart-title); }
body.dark-mode .data-link-meta  { color: var(--sidebar-label); }
body.dark-mode .form-label { color: var(--chart-title); }
body.dark-mode .form-input,
body.dark-mode .form-input input,
body.dark-mode .form-textarea {
    background: var(--sidebar-input-bg);
    border-color: var(--sidebar-input-border);
    color: var(--sidebar-input-text);
}
body.dark-mode .form-input::placeholder,
body.dark-mode .form-input input::placeholder,
body.dark-mode .form-textarea::placeholder { color: var(--sidebar-label); }
body.dark-mode .pub-number {
    background: #1E3A5F;
    color: #60A5FA;
}

/* ── Guide page ──────────────────────────────────────────────────────────── */
.guide-section {
    margin-bottom: 36px;
}

.guide-sub-title {
    font-size: 13px;
    font-weight: 600;
    color: #1E293B;
    margin: 20px 0 6px 0;
}

.guide-tip {
    background: #EFF6FF;
    border-left: 3px solid #2563EB;
    border-radius: 0 6px 6px 0;
    padding: 10px 14px;
    font-size: 13px;
    color: #1E40AF;
    margin: 12px 0;
}

.guide-examples {
    background: #F8FAFC;
    border: 1px solid #E2E8F0;
    border-radius: 8px;
    padding: 12px 16px;
    margin: 8px 0 0 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.guide-example-row {
    display: grid;
    grid-template-columns: 1fr 24px auto;
    align-items: start;
    font-size: 11.5px;
    gap: 6px;
}

.guide-example-label {
    color: #0F172A;
    font-weight: 500;
    font-family: 'Courier New', monospace;
    background: #F1F5F9;
    padding: 3px 8px;
    border-radius: 4px;
    line-height: 1.5;
}

.guide-example-arrow {
    color: #94A3B8;
    text-align: center;
    padding-top: 3px;
}

.guide-example-result {
    color: #10B981;
    font-weight: 500;
    line-height: 1.5;
}

/* Dark mode — guide */
body.dark-mode .guide-sub-title  { color: var(--chart-title); }
body.dark-mode .guide-tip        { background: #1E3A5F; border-color: #3B82F6; color: #93C5FD; }
body.dark-mode .guide-examples   { background: var(--main-bg); border-color: var(--card-border); }
body.dark-mode .guide-example-label { background: var(--card-bg); color: var(--chart-title); }

/* ── About info grid ──────────────────────────────────────────────────────── */
.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 24px 0 32px 0;
}

.info-block {
    background: #F8FAFC;
    border: 1px solid #E2E8F0;
    border-radius: 10px;
    padding: 16px 20px;
}

.info-label {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #94A3B8;
    margin: 0 0 6px 0;
}

.info-value {
    font-size: 13px;
    font-weight: 500;
    color: #0F172A;
    margin: 0;
    line-height: 1.4;
}

.info-link {
    font-size: 13px;
    font-weight: 500;
    color: #0F172A;
    text-decoration: none;
    line-height: 1.4;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    border-bottom: 1px solid #CBD5E1;
    padding-bottom: 1px;
    transition: color 0.15s, border-color 0.15s;
}
.info-link:hover {
    color: #2563EB;
    border-color: #2563EB;
}
body.dark-mode .info-link { color: var(--chart-title); border-color: #3B526E; }
body.dark-mode .info-link:hover { color: #60A5FA; border-color: #60A5FA; }

/* ── Publications ─────────────────────────────────────────────────────────── */
.pub-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.pub-card {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: #F8FAFC;
    border: 1px solid #E2E8F0;
    border-radius: 12px;
    align-items: flex-start;
}

.pub-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    min-width: 28px;
    background: #EFF6FF;
    color: #2563EB;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    margin-top: 2px;
}

.pub-body {
    flex: 1;
}

.pub-title {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: #0F172A;
    text-decoration: none;
    line-height: 1.5;
    margin-bottom: 8px;
}

.pub-title:hover {
    color: #2563EB;
    text-decoration: underline;
}

.pub-authors {
    font-size: 13px;
    color: #475569;
    margin: 0 0 4px 0;
    line-height: 1.5;
}

.pub-venue {
    font-size: 13px;
    color: #64748B;
    font-style: italic;
    margin: 0 0 4px 0;
}

.pub-details {
    font-size: 12px;
    color: #94A3B8;
    margin: 0 0 4px 0;
}

.pub-doi {
    font-size: 12px;
    color: #2563EB;
    margin: 4px 0 0 0;
    font-family: 'Inter', monospace;
}

/* ── Contact form ─────────────────────────────────────────────────────────── */
.contact-card {
    max-width: 640px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-label {
    font-size: 12px;
    font-weight: 600;
    color: #374151;
    letter-spacing: 0.01em;
}

.form-input,
.form-input input {
    width: 100%;
    padding: 10px 14px;
    font-size: 14px;
    font-family: 'Inter', sans-serif;
    color: #0F172A;
    background: #F8FAFC;
    border: 1px solid #E2E8F0;
    border-radius: 8px;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    box-sizing: border-box;
}

.form-input:focus,
.form-input input:focus {
    border-color: #2563EB;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    background: #FFFFFF;
}

.form-input::placeholder,
.form-input input::placeholder {
    color: #94A3B8;
}

.form-textarea {
    resize: vertical;
    min-height: 140px;
    line-height: 1.6;
}

.form-submit {
    align-self: flex-start;
    background-color: #2563EB;
    color: #FFFFFF;
    border: none;
    padding: 10px 28px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.1s ease;
    letter-spacing: 0.01em;
}

.form-submit:hover {
    background-color: #1D4ED8;
}

.form-submit:active {
    transform: scale(0.98);
}

/* ── Data page cards ─────────────────────────────────────────────────────── */
.data-card {
    background: #F8FAFC;
    border: 1px solid #E2E8F0;
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 16px;
}

.data-card-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 12px;
}

.data-icon {
    font-size: 24px;
    line-height: 1;
    margin-top: 2px;
    flex-shrink: 0;
}

.data-card-title {
    font-size: 16px;
    font-weight: 600;
    color: #0F172A;
    margin: 0 0 2px 0;
}

.data-card-subtitle {
    font-size: 12px;
    color: #94A3B8;
    margin: 0;
}

.data-card-desc {
    font-size: 14px;
    line-height: 1.7;
    color: #475569;
    margin: 0 0 16px 0;
}

.data-link-btn {
    display: inline-block;
    background: #2563EB;
    color: #FFFFFF;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    padding: 8px 18px;
    border-radius: 8px;
    transition: background-color 0.15s ease;
}

.data-link-btn:hover {
    background: #1D4ED8;
    color: #FFFFFF;
}

body.dark-mode .data-link-btn {
    background: #263548;
    color: #CBD5E1;
    border: 1px solid #3B526E;
}

body.dark-mode .data-link-btn:hover {
    background: #2F4260;
    color: #F1F5F9;
    border-color: #4A6480;
}

.data-link-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.data-link-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 12px 16px;
    background: #FFFFFF;
    border: 1px solid #E2E8F0;
    border-radius: 8px;
}

.data-link-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #0F172A;
    margin-bottom: 2px;
}

.data-link-meta {
    display: block;
    font-size: 12px;
    color: #94A3B8;
}

.data-link-pill {
    display: inline-block;
    color: #2563EB;
    text-decoration: none;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    padding: 4px 12px;
    border: 1px solid #BFDBFE;
    border-radius: 20px;
    background: #EFF6FF;
    transition: all 0.15s ease;
    flex-shrink: 0;
}

.data-link-pill:hover {
    background: #2563EB;
    color: #FFFFFF;
    border-color: #2563EB;
}

/* ── Breakdown checklist (horizontal, below chart) ───────────────────────── */
.breakdown-checklist label {
    display: inline-flex !important;
    align-items: center !important;
    gap: 5px !important;
    margin-right: 14px !important;
    font-size: 11px !important;
    color: #64748B !important;
    cursor: pointer !important;
    white-space: nowrap !important;
}

.breakdown-checklist label:hover {
    color: #0F172A !important;
}

.breakdown-checklist input[type='checkbox'] {
    accent-color: #2563EB !important;
    width: 12px !important;
    height: 12px !important;
}


/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE / MOBILE  (max-width: 768px)
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Hamburger button (hidden on desktop) ─────────────────────────────────── */
.hamburger-btn {
    display: none;
    background: transparent;
    border: 1px solid #334155;
    color: #94A3B8;
    font-size: 18px;
    line-height: 1;
    padding: 4px 10px;
    border-radius: 6px;
    cursor: pointer;
    margin-left: 6px;
    font-family: inherit;
}

/* ── Mobile nav drawer (hidden by default) ────────────────────────────────── */
.mobile-nav-drawer {
    display: none;
    flex-direction: column;
    background: #0F172A;
    border-bottom: 1px solid #1E293B;
    padding: 8px 0;
}
.mobile-nav-drawer.open { display: flex; }
.mobile-nav-link {
    color: #94A3B8;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 12px 24px;
    border-bottom: 1px solid #1E293B;
    font-family: 'Inter', sans-serif;
}
.mobile-nav-link:last-child { border-bottom: none; }
.mobile-nav-link:hover { color: #F1F5F9; background: #1E293B; }

/* ── Mobile filters toggle button (hidden on desktop) ─────────────────────── */
.mobile-filters-btn {
    display: none;
    width: 100%;
    background: var(--sidebar-bg);
    border: none;
    border-bottom: 1px solid var(--sidebar-border);
    color: var(--sidebar-label);
    font-size: 13px;
    font-weight: 600;
    padding: 10px 20px;
    cursor: pointer;
    text-align: left;
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.03em;
}

/* ── Mobile breakpoint ─────────────────────────────────────────────────────── */
@media (max-width: 768px) {

    /* Top bar */
    #topbar {
        padding: 0 16px !important;
        height: 52px !important;
    }
    .topbar-title {
        font-size: 13px !important;
    }
    #nav-links { display: none !important; }
    .csv-wrapper-desktop { display: none !important; }
    .hamburger-btn { display: flex !important; align-items: center; }

    /* Page content area */
    #page-content {
        overflow-y: auto !important;
    }

    /* Explorer: stack sidebar above main */
    #explorer-body {
        flex-direction: column !important;
        overflow-y: auto !important;
    }

    /* Sidebar: hidden by default on mobile, full width when toggled */
    #main-sidebar {
        display: none !important;
        width: 100% !important;
        border-right: none !important;
        border-bottom: 1px solid var(--sidebar-border);
        max-height: 70vh;
        overflow-y: auto;
        flex-shrink: 0 !important;
    }
    #main-sidebar.mobile-open {
        display: flex !important;
    }

    /* Mobile filters button: visible */
    .mobile-filters-btn { display: block !important; }

    /* Main content: no height constraint */
    #main-content {
        overflow: visible !important;
        min-height: 0;
    }

    /* Stat bar: 2x2 grid */
    #stat-bar {
        flex-wrap: wrap !important;
        height: auto !important;
    }
    #stat-bar > div {
        flex: 1 1 50% !important;
        min-width: 0 !important;
        border-right: 1px solid var(--card-border) !important;
        border-bottom: 1px solid var(--card-border) !important;
    }

    /* Chart card */
    #chart-card {
        margin: 12px !important;
        border-radius: 10px !important;
    }

    /* Chart area padding */
    #main-content > div:last-child {
        padding: 12px !important;
    }

    /* Static pages */
    .page-container {
        padding: 24px 16px !important;
    }
    .page-card {
        padding: 28px 20px !important;
        border-radius: 10px !important;
    }
    .info-grid {
        grid-template-columns: 1fr 1fr !important;
    }
    .pub-card {
        flex-direction: column !important;
        gap: 8px !important;
    }
    .pub-number {
        font-size: 20px !important;
    }
    .guide-examples {
        padding: 10px 12px !important;
    }
    .guide-example-row {
        grid-template-columns: 1fr !important;
        gap: 2px !important;
    }
    .guide-example-arrow { display: none !important; }

    /* Footer */
    footer {
        font-size: 11px !important;
        padding: 10px 16px !important;
    }
}