:root {
  --white: #fff;
  --canvas: #f4f6f8;
  --surface-blue: #eef4ff;
  --ink-0: #172033;
  --ink-1: #3e485b;
  --ink-2: #586275;
  --blue-0: #1557d6;
  --blue-1: #0d43ac;
  --blue-2: #d9e6ff;
  --teal-0: #007f77;
  --line-0: #e2e6eb;
  --line-1: #b8c0cc;
  --success-bg: #e6f4f1;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; color: var(--ink-0); background: var(--white); font: 1rem/1.65 var(--font); }
body > .masthead, body > .footer { flex-shrink: 0; }
body > #main-content { flex: 1 0 auto; }
a { color: var(--blue-0); }
button, input, select { font: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; padding: 10px 14px; color: var(--white); background: var(--blue-0); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible, select:focus-visible { outline: 3px solid var(--blue-0); outline-offset: 3px; }
.shell { width: min(1120px, calc(100% - 48px)); margin: 0 auto; }

.not-found { min-height: 65vh; min-height: 65svh; padding-block: 72px; display: grid; place-items: center; text-align: center; }
.not-found-content { width: min(100%, 560px); }
.not-found-code { margin: 0 0 24px; color: var(--blue-0); font-size: 2.5rem; font-weight: 700; line-height: 1; letter-spacing: .08em; }
.not-found h1 { margin: 0; font-size: clamp(1.75rem, 4vw, 2.25rem); line-height: 1.35; }
.not-found-message { margin: 16px 0 32px; color: var(--ink-2); }
.not-found-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.not-found-actions a { min-height: 48px; padding-inline: 24px; }
@media (max-width: 480px) {
  .not-found { padding-block: 56px; }
  .not-found-actions { flex-direction: column; width: min(100%, 280px); margin-inline: auto; }
}

.masthead { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line-0); background: var(--white); }
.masthead-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { min-height: 44px; display: inline-flex; align-items: center; gap: 10px; color: var(--ink-0); text-decoration: none; }
.brand-mark { width: 30px; height: 30px; display: block; flex: 0 0 auto; }
.brand strong { font-size: 1.03rem; letter-spacing: .025em; }
.brand span { color: var(--ink-2); font-size: .88rem; }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a { min-width: 48px; min-height: 44px; padding: 0 12px; display: inline-flex; align-items: center; justify-content: center; border-radius: 8px; color: var(--ink-1); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--blue-0); background: var(--surface-blue); }

.hero { padding: 76px 0 64px; border-bottom: 1px solid var(--line-0); background: var(--white); }
.hero-copy { max-width: 760px; }
.hero h1 { max-width: 820px; margin: 0 0 18px; font-size: clamp(2.45rem, 6vw, 4.6rem); line-height: 1.12; letter-spacing: -.04em; }
.hero p { max-width: 720px; margin: 0; color: var(--ink-1); font-size: 1.18rem; }
.search-band { max-width: 760px; margin-top: 36px; padding: 7px; display: grid; grid-template-columns: 1fr auto; gap: 8px; border: 1px solid var(--line-1); border-radius: 12px; background: var(--white); box-shadow: 0 8px 30px rgb(23 32 51 / 8%); }
.search-band input { min-width: 0; height: 48px; padding: 0 14px; border: 0; color: var(--ink-0); background: transparent; }
.button-primary, .search-band button { min-height: 48px; padding: 0 22px; border: 0; border-radius: 8px; display: inline-flex; align-items: center; justify-content: center; color: var(--white); background: var(--blue-0); font-weight: 600; cursor: pointer; text-decoration: none; }
.button-primary:hover, .search-band button:hover { background: var(--blue-1); }
.button-disabled, .button-disabled:hover { color: var(--ink-2); background: #dfe4eb; cursor: not-allowed; }
.button-secondary { min-height: 44px; padding: 0 16px; border: 1px solid var(--line-1); border-radius: 8px; display: inline-flex; align-items: center; justify-content: center; color: var(--ink-0); background: var(--white); text-decoration: none; }

.section { padding: 64px 0; }
.section + .section { border-top: 1px solid var(--line-0); }
.section-head { margin-bottom: 28px; display: flex; justify-content: space-between; align-items: end; gap: 24px; }
.section h2, .page-head h1 { margin: 0; font-size: clamp(1.9rem, 4vw, 2.6rem); line-height: 1.18; letter-spacing: -.025em; }
.section-head > a { min-height: 44px; display: inline-flex; align-items: center; }
.browse-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.browse-card { min-height: 128px; padding: 20px; border: 1px solid var(--line-0); border-radius: 12px; display: flex; flex-direction: column; justify-content: space-between; color: var(--ink-0); background: var(--white); text-decoration: none; }
.browse-card:hover { border-color: var(--blue-0); background: var(--surface-blue); }
.browse-card strong { font-size: 1.05rem; }
.browse-card span { color: var(--ink-2); font-size: .84rem; }
.record-list { border-top: 1px solid var(--line-0); }
.record { padding: 24px 8px; border-bottom: 1px solid var(--line-0); display: grid; grid-template-columns: minmax(0, 1fr) 180px 180px 28px; gap: 22px; align-items: center; color: var(--ink-0); text-decoration: none; }
.record:hover { background: #f8faff; }
.record-title { font-size: 1.1rem; font-weight: 600; }
.record-title small { display: block; margin-top: 6px; color: var(--ink-2); font-size: .88rem; font-weight: 400; }
.record-meta { color: var(--ink-1); font-size: .86rem; }
.record-meta strong { display: block; margin-bottom: 3px; color: var(--ink-2); font-size: .75rem; font-weight: 400; }
.arrow { color: var(--blue-0); font-size: 1.4rem; }
.empty-state { padding: 48px 24px; border: 1px solid var(--line-0); border-radius: 12px; text-align: center; background: var(--canvas); }
.result-bar + .empty-state { margin-top: 24px; }
.empty-state h2, .empty-state h3 { margin: 0 0 8px; }
.empty-state p { margin: 0 0 18px; color: var(--ink-2); }

.page-head { padding: 56px 0 42px; border-bottom: 1px solid var(--line-0); background: var(--canvas); }
.page-head p { max-width: 700px; margin: 12px 0 0; color: var(--ink-1); }
.catalog-search { max-width: 680px; margin-top: 28px; }
.catalog-layout { padding: 40px 0 80px; display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 44px; }
.filters { align-self: start; border: 1px solid var(--line-0); border-radius: 12px; overflow: hidden; }
.filters > h2 { margin: 0; padding: 18px; border-bottom: 1px solid var(--line-0); font-size: 1rem; }
.filter-section { border-top: 1px solid var(--line-0); }
.filter-section > summary { min-height: 52px; padding: 14px 18px; cursor: pointer; font-size: .92rem; font-weight: 700; }
.filter-section > summary:hover { background: var(--canvas); }
.filter-group { min-width: 0; margin: 0; padding: 0 18px 14px; border: 0; }
.filter-group legend { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.filter-group label { clear: both; min-height: 44px; display: flex; align-items: center; gap: 10px; color: var(--ink-1); font-size: .9rem; }
.filter-group input { width: 17px; height: 17px; }
.filter-actions { padding: 16px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; text-align: center; }
.filter-actions .button-primary, .filter-actions .button-secondary { width: 100%; min-height: 44px; padding: 0 8px; font-size: .875rem; white-space: nowrap; }
.filter-actions .button-secondary { border-color: var(--line-0); color: var(--ink-1); }
.filter-actions .button-secondary:hover { border-color: var(--line-1); background: var(--canvas); color: var(--ink-0); }
.mobile-filters { display: none; }
.result-bar { min-height: 52px; padding: 0 0 20px; border-bottom: 1px solid var(--line-1); display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--ink-1); font-size: .88rem; }
.result-bar label { display: inline-flex; align-items: center; gap: 12px; }
.sort-select { min-height: 48px; min-width: 156px; padding: 10px 16px; border: 1px solid var(--line-1); border-radius: 10px; color: var(--ink-0); background: var(--white); font-weight: 600; cursor: pointer; color-scheme: light; }
.sort-select:hover:not(:disabled) { border-color: var(--blue-0); background: var(--surface-blue); }
.sort-select:disabled { opacity: .5; cursor: not-allowed; }
@supports (appearance: base-select) {
  .sort-select, .sort-select::picker(select) { appearance: base-select; }
  .sort-select { gap: 24px; }
  .sort-select::picker-icon { color: var(--blue-0); }
  .sort-select:open { border-color: var(--blue-0); }
  .sort-select:open::picker-icon { rotate: 180deg; }
  .sort-select::picker(select) { margin-block: 8px; padding: 6px; border: 1px solid var(--line-0); border-radius: 12px; color: var(--ink-0); background: var(--white); box-shadow: 0 12px 32px #1720331a; }
  .sort-select option { min-height: 44px; padding: 10px 12px; gap: 12px; border-radius: 7px; font-weight: 400; cursor: pointer; }
  .sort-select option:checked { color: var(--blue-0); background: var(--surface-blue); font-weight: 600; }
  .sort-select option:hover, .sort-select option:focus-visible { background: var(--blue-2); outline: none; }
  .sort-select option::checkmark { color: var(--blue-0); }
}
.pagination { padding-top: 24px; display: flex; justify-content: center; align-items: center; gap: 18px; color: var(--ink-2); }
.pagination a { min-height: 44px; display: inline-flex; align-items: center; }

.detail-hero { padding: 50px 0 36px; border-bottom: 1px solid var(--line-0); background: var(--canvas); }
.breadcrumb { min-height: 36px; display: flex; align-items: center; gap: 7px; color: var(--ink-2); font-size: .84rem; }
.detail-title { max-width: 850px; margin-top: 22px; }
.detail-title h1 { margin: 0 0 18px; font-size: clamp(2.15rem, 5vw, 3.65rem); line-height: 1.13; letter-spacing: -.04em; }
.detail-title p { max-width: 760px; margin: 0; color: var(--ink-1); font-size: 1.18rem; }
.update-line { margin-top: 20px; color: var(--ink-2); font-size: .84rem; }
.tag-row { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }
.tag { padding: 5px 10px; border-radius: 999px; color: var(--blue-1); background: var(--blue-2); font-size: .8rem; }
.tag.available { color: #00655f; background: var(--success-bg); }
.facts-wrap { border-bottom: 1px solid var(--line-0); background: var(--white); }
.facts { margin: 0 auto; padding: 22px 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); }
.fact { min-width: 0; margin: 0; padding: 4px 20px; border-right: 1px solid var(--line-0); }
.fact:first-child { padding-left: 0; }
.fact:last-child { border-right: 0; }
.fact dt { color: var(--ink-2); font-size: .78rem; }
.fact dd { margin: 5px 0 0; overflow-wrap: anywhere; font-size: .92rem; font-weight: 600; }
.detail-layout { padding: 48px 0 88px; display: grid; grid-template-columns: minmax(0, 760px) 220px; justify-content: space-between; gap: 64px; }
.reading-column, .reading-layout { max-width: 760px; }
.reading-layout { padding: 48px 0 88px; }
.reading-layout article { max-width: 760px; }
.prose-section { margin-bottom: 46px; scroll-margin-top: 88px; }
.prose-section h2 { margin: 0 0 16px; font-size: 1.45rem; line-height: 1.3; }
.prose-section p { color: var(--ink-1); white-space: pre-line; }
.download-panel { padding: 22px; border: 1px solid var(--blue-2); border-radius: 12px; background: var(--surface-blue); }
.file-row { padding: 12px 0; display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; }
.file-row + .file-row { border-top: 1px solid var(--blue-2); }
.file-name { overflow-wrap: anywhere; font-weight: 600; }
.file-detail { margin-top: 5px; color: var(--ink-2); font-size: .8rem; }
.download-note { margin: 14px 0 0; color: var(--ink-2); font-size: .8rem; }
.tool-install-note { font-size: .88rem; }
.tool-features { margin: 0; }
.tool-features > div { padding: 18px 0; border-bottom: 1px solid var(--line-0); }
.tool-features > div:first-child { padding-top: 0; }
.tool-features dt { font-weight: 600; }
.tool-features dd { margin: 6px 0 0; color: var(--ink-1); }
.tool-steps { padding-left: 1.4em; color: var(--ink-1); }
.tool-steps li + li { margin-top: 10px; }
.tool-checksum p, .tool-checksum code { overflow-wrap: anywhere; }
.tool-checksum code { display: block; margin-top: 6px; color: var(--ink-1); font-size: .82rem; }
.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.info-box { padding: 20px; border: 1px solid var(--line-0); border-radius: 10px; }
.info-box h3 { margin: 0 0 8px; font-size: .92rem; }
.info-box p { margin: 0 0 10px; font-size: .9rem; }
.metadata-table { width: 100%; border-collapse: collapse; border-top: 1px solid var(--line-0); }
.metadata-table th, .metadata-table td { padding: 13px 10px; border-bottom: 1px solid var(--line-0); text-align: left; vertical-align: top; }
.metadata-table th { width: 150px; color: var(--ink-2); font-size: .82rem; font-weight: 600; }
.metadata-table td { color: var(--ink-1); }
.side-index { position: sticky; top: 92px; align-self: start; border-left: 2px solid var(--line-0); }
.side-index a { min-height: 44px; padding-left: 16px; display: flex; align-items: center; color: var(--ink-1); text-decoration: none; font-size: .88rem; }
.side-index a:hover { margin-left: -2px; border-left: 2px solid var(--blue-0); color: var(--blue-0); }

.footer { padding: 42px 0; color: #dce3f0; background: var(--ink-0); }
.footer-grid { display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.footer strong { color: var(--white); }
.footer p { margin: 5px 0 0; font-size: .86rem; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-links a { white-space: nowrap; }
.footer a { min-height: 44px; padding: 0 10px; display: inline-flex; align-items: center; color: var(--white); }

@media (max-width: 820px) {
  .shell { width: min(100% - 32px, 680px); }
  .brand span { display: none; }
  .hero { padding: 52px 0 46px; }
  .browse-grid { grid-template-columns: 1fr 1fr; }
  .record { grid-template-columns: 1fr 28px; gap: 12px; }
  .record-meta { display: none; }
  .catalog-layout { padding-top: 22px; grid-template-columns: 1fr; gap: 18px; }
  .filters { display: none; }
  .mobile-filters { display: block; }
  .mobile-filters > summary { min-height: 48px; padding: 0 14px; border: 1px solid var(--line-1); border-radius: 8px; display: flex; align-items: center; cursor: pointer; list-style: none; }
  .mobile-filters .filter-sheet-content { margin: 8px 0 18px; border: 1px solid var(--line-0); border-radius: 12px; overflow: hidden; background: var(--white); box-shadow: 0 14px 35px rgb(23 32 51 / 15%); }
  .facts { padding: 0; grid-template-columns: 1fr 1fr; }
  .fact { padding: 16px; border-bottom: 1px solid var(--line-0); }
  .fact:first-child { padding-left: 16px; }
  .fact:nth-child(even) { border-right: 0; }
  .detail-layout { padding-top: 34px; grid-template-columns: 1fr; }
  .side-index { display: none; }
  .info-grid { grid-template-columns: 1fr; }
  .footer-grid { align-items: flex-start; flex-direction: column; }
  .footer-links a[rel="external"] { flex-basis: 100%; }
}

@media (max-width: 520px) {
  .masthead-inner { min-height: 60px; gap: 12px; flex-wrap: wrap; padding-block: 8px; }
  .brand strong { font-size: .95rem; }
  .nav a { padding: 0 8px; }
  .hero h1 { font-size: 2.55rem; }
  .search-band { grid-template-columns: 1fr; box-shadow: none; }
  .search-band button { width: 100%; }
  .browse-grid { grid-template-columns: 1fr; }
  .browse-card { min-height: 94px; }
  .section { padding: 46px 0; }
  .section-head { align-items: flex-start; flex-direction: column; gap: 8px; }
  .page-head { padding: 28px 0 24px; }
  .catalog-search { margin-top: 18px; grid-template-columns: minmax(0, 1fr) auto; }
  .catalog-search button { width: auto; padding-inline: 18px; }
  .result-bar { padding: 8px 0 20px; gap: 12px; }
  .result-bar > span { min-width: 0; overflow-wrap: anywhere; }
  .result-bar > form { flex-shrink: 0; }
  .result-bar label { gap: 8px; }
  .sort-select { min-width: 0; }
  .file-row { grid-template-columns: 1fr; }
  .file-row .button-primary { width: 100%; }
  .metadata-table th { width: 112px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}
/* Dataset feedback follows the public catalog, not the admin interface. */
.feedback-page{max-width:760px;padding-top:40px;padding-bottom:64px;min-height:65vh}
.feedback-page h1{font-size:28px;margin:24px 0}
.feedback-form{display:grid;gap:24px}
.feedback-field{display:grid;gap:8px}
.feedback-field label{font-weight:600}
.feedback-field input,.feedback-field select,.feedback-field textarea{width:100%;min-height:48px;padding:12px;border:1px solid #b8c0cc;border-radius:8px;background:#fff;color:#172033;font:inherit}
.feedback-field textarea{resize:vertical;line-height:1.6}
.feedback-field :focus-visible{outline:2px solid #1557d6;outline-offset:3px}
.feedback-form .button-primary{justify-self:start;min-height:48px}
.feedback-note{font-size:14px;color:#586275;line-height:1.7;margin:0}
.feedback-error,.feedback-field .errorlist{color:#a32929}
.feedback-link{display:inline-flex;align-items:center;min-height:44px;margin-top:8px;font-size:14px}