:root {
    --primary-color: #333;
    --secondary-color: #555;
    --accent-color: #cc0000;
    --text-color: #333;
    --muted: #777;
    --background-color: #fff;
    --section-bg: #f9f9f9;
    --border-color: #ddd;
}

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

body {
    font-family: 'Libre Baskerville', 'Baskerville', Georgia, serif;
    line-height: 1.65;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

a { color: var(--accent-color); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: #800000; }

code {
    font-family: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
    font-size: 0.88em;
    background-color: var(--section-bg);
    padding: 1px 5px;
    border-radius: 3px;
}

/* Header and nav */
header { padding: 48px 0 20px; text-align: center; }
header .eyebrow { font-size: 0.85rem; color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase; }
header .eyebrow a { color: var(--muted); }
header h1 { font-size: 2.4rem; font-weight: 700; margin: 6px 0 4px; }
header h1 a { color: var(--primary-color); }
header .tagline { font-style: italic; color: var(--secondary-color); }

nav { border-top: 1px solid var(--border-color); border-bottom: 1px solid var(--border-color); margin-bottom: 30px; }
nav ul { list-style: none; display: flex; justify-content: center; flex-wrap: wrap; }
nav li a {
    display: block; padding: 12px 18px; color: var(--primary-color);
    font-size: 0.95rem; border-bottom: 2px solid transparent;
}
nav li a:hover, nav li a.active { color: var(--accent-color); border-bottom-color: var(--accent-color); }

/* Sections */
.section { padding: 24px 0 36px; }
.section-title {
    font-size: 1.6rem; color: var(--primary-color);
    border-bottom: 1px solid var(--border-color); padding-bottom: 8px; margin-bottom: 18px;
}
.intro p { margin-bottom: 14px; max-width: 72ch; }
.blurb { color: var(--secondary-color); margin-bottom: 18px; max-width: 72ch; }
.note { font-size: 0.92rem; color: var(--secondary-color); border-left: 3px solid var(--border-color); padding-left: 12px; }

.counts, .toc {
    list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 8px 24px; margin-top: 16px;
}
.counts li, .toc li { display: flex; justify-content: space-between; border-bottom: 1px dotted var(--border-color); padding: 4px 0; }
.counts span, .toc span { color: var(--muted); font-size: 0.9rem; }

/* Paper cards */
.paper { margin-bottom: 26px; padding-left: 16px; border-left: 2px solid var(--accent-color); }
.paper h4 { font-size: 1.12rem; color: var(--secondary-color); margin-bottom: 4px; line-height: 1.4; }
.paper h4 a { color: var(--secondary-color); }
.paper h4 a:hover { color: var(--accent-color); }
.paper .meta { font-size: 0.92rem; color: var(--muted); margin-bottom: 8px; }
.paper .level { border: 1px solid var(--border-color); border-radius: 3px; padding: 0 6px; font-size: 0.8rem; }
.paper .summary { margin-bottom: 8px; max-width: 76ch; }
.facts { font-size: 0.9rem; color: var(--secondary-color); margin: 0 0 8px; display: grid; gap: 3px; max-width: 76ch; }
.facts > div { display: grid; grid-template-columns: 7.5em 1fr; gap: 10px; }
.facts dt { font-weight: 700; color: var(--primary-color); }
.facts dd ul { list-style: none; }
.facts dd li::before { content: "\2013\00a0"; color: var(--muted); }
.facts .desc { color: var(--muted); }
.facts .src { font-size: 0.82rem; white-space: nowrap; }
.na { color: var(--muted); font-style: italic; }
.filter { width: 100%; max-width: 420px; padding: 8px 10px; font: inherit; font-size: 0.95rem; border: 1px solid var(--border-color); border-radius: 3px; margin-bottom: 14px; background: var(--background-color); color: var(--text-color); }
.table-wrap { overflow-x: auto; }
table.sortable th { cursor: pointer; white-space: nowrap; }
table.sortable th::after { content: " \2195"; color: var(--muted); font-weight: 400; }
table.sortable td { font-size: 0.88rem; }
table.sortable td:first-child { white-space: normal; min-width: 14em; }
table.sortable .t { color: var(--muted); font-size: 0.82rem; }
table.sortable td.d { min-width: 22em; color: var(--secondary-color); }
table.sortable td.d ul { list-style: none; }
table.sortable td.d li { padding: 1px 0; }
table.sortable td.d li + li { border-top: 1px dotted var(--border-color); }
.viz-section .container { max-width: 1200px; }
.viz { width: 100%; height: 780px; border: 1px solid var(--border-color); border-radius: 4px; background: #fcfcfb; }
@media (max-width: 860px) {
    .viz { height: 560px; }
    table.sortable thead { display: none; }
    table.sortable, table.sortable tbody, table.sortable tr, table.sortable td { display: block; width: 100%; }
    table.sortable tr { border-bottom: 2px solid var(--border-color); padding: 8px 0; }
    table.sortable td { border: 0; padding: 3px 0; min-width: 0 !important; }
    table.sortable td::before { content: attr(data-label); display: block; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
}
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: 0.8rem; background: var(--section-bg); border: 1px solid var(--border-color); border-radius: 3px; padding: 1px 8px; color: var(--secondary-color); }
.tag:hover { border-color: var(--accent-color); color: var(--accent-color); }

/* Variable map */
.register { margin-bottom: 34px; }
.register h3 { font-size: 1.2rem; color: var(--primary-color); margin-bottom: 4px; }
.register .what { color: var(--secondary-color); margin-bottom: 10px; max-width: 76ch; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; margin-bottom: 8px; }
th, td { text-align: left; vertical-align: top; padding: 7px 10px; border-bottom: 1px solid var(--border-color); }
th { font-weight: 700; color: var(--secondary-color); background: var(--section-bg); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; }
td:first-child { white-space: nowrap; }
.used-by { font-size: 0.9rem; color: var(--secondary-color); }

footer { border-top: 1px solid var(--border-color); padding: 24px 0 40px; margin-top: 20px; font-size: 0.9rem; color: var(--secondary-color); text-align: center; }

@media (max-width: 600px) {
    .facts > div { grid-template-columns: 1fr; gap: 0; }
    header h1 { font-size: 1.9rem; }
    nav li a { padding: 10px 12px; }
    td:first-child { white-space: normal; }
    table { font-size: 0.88rem; }
}

/* Landscape controls */
.controls { margin-bottom: 12px; display: grid; gap: 8px; }
.ctl-row { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.ctl-label { font-size: 0.85rem; color: var(--muted); margin-right: 4px; }
.chip { font: inherit; font-size: 0.82rem; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--border-color); background: var(--background-color); color: var(--secondary-color); cursor: pointer; }
.chip.on { background: #2c2c2a; border-color: #2c2c2a; color: #fcfcfb; }
.chip.ghost { border-style: dashed; }
.viz-help { font-size: 0.85rem; color: var(--muted); margin: 6px 0 28px; }
.sub-title { font-size: 1.2rem; margin-bottom: 4px; color: var(--primary-color); }
.viz.flat { height: 380px; }
.cell-list { margin-top: 12px; font-size: 0.92rem; }
.cell-list h4 { font-size: 1rem; margin-bottom: 6px; }
.cell-list ul { list-style: none; display: grid; gap: 4px; }
.cell-list .sw { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: baseline; }
.cell-list .muted { color: var(--muted); }

/* Variable definitions */
details.defs { margin: 2px 0 10px; font-size: 0.9rem; max-width: 80ch; }
details.defs summary { cursor: pointer; color: var(--accent-color); font-weight: 700; }
details.defs ul { list-style: none; margin-top: 8px; display: grid; gap: 10px; }
details.defs li { border-left: 2px solid var(--border-color); padding-left: 10px; color: var(--secondary-color); }
details.defs li strong { color: var(--primary-color); }
.concept { font-size: 0.75rem; color: var(--muted); border: 1px solid var(--border-color); border-radius: 3px; padding: 0 5px; margin-left: 4px; }
.regs span, .codes span { color: var(--muted); }
code { white-space: normal; word-break: normal; overflow-wrap: break-word; }
.dsrc { font-size: 0.8rem; color: var(--muted); }
.rep { font-size: 0.85rem; margin-top: 6px; }
.cb-chips { margin-bottom: 18px; }
.cb-title { font-size: 1.15rem; margin: 26px 0 8px; color: var(--primary-color); }
.cb-title span { font-size: 0.85rem; color: var(--muted); font-weight: 400; }
table.codebook td { font-size: 0.86rem; }
table.codebook td:first-child { white-space: normal; min-width: 9em; }
table.codebook td:nth-child(3) { min-width: 20em; }
table.codebook td:nth-child(4) { min-width: 15em; color: var(--secondary-color); }
table.codebook td:last-child { min-width: 9em; max-width: 15em; overflow-wrap: anywhere; font-size: 0.8rem; }
.dsrc { overflow-wrap: anywhere; }
@media (max-width: 860px) {
    table.codebook thead { display: none; }
    table.codebook, table.codebook tbody, table.codebook tr, table.codebook td { display: block; width: 100%; min-width: 0 !important; }
    table.codebook tr { border-bottom: 2px solid var(--border-color); padding: 8px 0; }
    table.codebook td { border: 0; padding: 3px 0; }
    table.codebook td::before { content: attr(data-label); display: block; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
}

/* Survey page */
article.survey { margin-bottom: 26px; padding-left: 16px; border-left: 2px solid var(--accent-color); }
article.survey h4 { font-size: 1.12rem; color: var(--primary-color); margin-bottom: 2px; }
article.survey .meta { font-size: 0.9rem; color: var(--muted); margin-bottom: 6px; }
.sv-meta { font-size: 0.9rem; color: var(--secondary-color); margin: 4px 0; max-width: 80ch; }
ul.docs { list-style: none; display: grid; gap: 5px; margin: 8px 0; font-size: 0.92rem; }
.dtype { display: inline-block; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.03em; padding: 0 6px; border-radius: 3px; border: 1px solid var(--border-color); color: var(--secondary-color); margin-right: 4px; }
.dtype.t-questionnaire { border-color: #2a78d6; color: #1c5cab; }
.dtype.t-appendix-with-questions { border-color: #1baf7a; color: #0c7a52; }
.muted { color: var(--muted); }
.dtype.t-codebook { border-color: #6250d6; color: #4a3aa7; }
.dtype.t-questions-quoted-in-paper { border-color: #eda100; color: #8a5d00; }
.mirror { font-size: 0.82rem; color: var(--muted); margin: 2px 0 2px 2px; }
.mirror a[download] { font-weight: 700; }
.sha { font-family: "SFMono-Regular", Menlo, Consolas, monospace; font-size: 0.75rem; }