:root {
  --bg: #FBF7F0;
  --ink: #2A2622;
  --ink-soft: #6B6459;
  --accent: #E8B33C;
  --accent-deep: #C4623A;
  --line: #E4DCCF;
  --surface: #FFFFFF;
  --surface-warm: #F5EFE4;
  --radius: 6px;
  --wrap: 1160px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

/* ============================================================
   base
   ============================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.6em;
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 19px;
}

h4 {
  font-size: 16px;
}

p {
  margin: 0 0 1em;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: var(--accent-deep);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

figure {
  margin: 0;
}

figcaption {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  text-align: left;
  vertical-align: top;
}

/* ============================================================
   layout
   ============================================================ */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header,
.site-main,
.site-footer,
.fact-bar,
.top-fact-bar {
  width: 100%;
}

.site-header,
.site-main,
.site-footer {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.site-main {
  flex: 1 1 auto;
  padding-top: 32px;
  padding-bottom: 64px;
}

.inner-main {
  padding-top: 20px;
}

.site-footer {
  padding-top: 40px;
  padding-bottom: 32px;
  border-top: 1px solid var(--line);
}

/* ============================================================
   components — fact bar & header
   ============================================================ */

.fact-bar,
.top-fact-bar {
  background: var(--ink);
  color: #F3EDE3;
  font-size: 13px;
  line-height: 1.6;
}

.fact-bar p,
.top-fact-bar p {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 8px 24px;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}

.brand:hover,
.brand:focus-visible {
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-mark::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-left: 6px;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: middle;
}

.brand-sub {
  font-size: 12px;
  color: var(--ink-soft);
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
}

.nav-toggle::before {
  content: "栏目";
  margin-right: 6px;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 22px;
}

.nav-list a {
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 2px solid transparent;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--accent-deep);
  text-decoration: none;
  border-bottom-color: var(--line);
}

.nav-list a.is-current {
  color: var(--accent-deep);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

/* ============================================================
   components — breadcrumb & page header
   ============================================================ */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 13px;
  color: var(--ink-soft);
}

.breadcrumb a {
  color: var(--ink-soft);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--accent-deep);
}

.breadcrumb-sep {
  color: var(--line);
}

.breadcrumb-current {
  color: var(--ink);
}

.page-header {
  padding-bottom: 24px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  margin-bottom: 12px;
}

.inner-main .page-title {
  font-size: 28px;
}

.page-description,
.page-summary,
.page-lead {
  max-width: 820px;
  margin: 0 0 0.6em;
  color: var(--ink-soft);
  font-size: 15px;
}

.page-summary {
  margin-bottom: 0;
}

/* ============================================================
   components — shared section head
   ============================================================ */

.section-head {
  margin-bottom: 22px;
}

.section-label,
.section-index {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--accent-deep);
}

.section-desc,
.section-lead,
.section-intro {
  max-width: 780px;
  margin: 0 0 0.4em;
  font-size: 15px;
  color: var(--ink-soft);
}

.section-title {
  margin-bottom: 8px;
}

.section-foot {
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink-soft);
}

.section-foot a {
  margin-right: 16px;
}

/* ============================================================
   components — footer
   ============================================================ */

.site-footer {
  display: grid;
  grid-template-columns: minmax(240px, 1.4fr) repeat(3, minmax(150px, 1fr));
  gap: 24px 32px;
  align-items: start;
}

.footer-brand {
  grid-column: 1;
}

.footer-name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
}

.footer-desc {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-group {
  margin: 0;
}

.footer-title {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.footer-group ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-group a {
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-group a:hover,
.footer-group a:focus-visible {
  color: var(--accent-deep);
}

.footer-boundary,
.footer-copy {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.footer-boundary {
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

/* ============================================================
   pages — index
   ============================================================ */

.hero {
  display: grid;
  grid-template-columns: minmax(520px, 1.15fr) minmax(280px, 0.85fr);
  gap: 40px;
  align-items: start;
  padding-bottom: 40px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.hero-text .section-label {
  margin-bottom: 10px;
}

.hero-text .page-title {
  margin-bottom: 16px;
}

.hero-lead {
  max-width: 620px;
  font-size: 16px;
  color: var(--ink-soft);
}

.hero-paths {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-top: 22px;
}

.hero-paths a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 14px;
  color: var(--ink);
}

.hero-paths a:hover,
.hero-paths a:focus-visible {
  border-color: var(--accent);
  color: var(--accent-deep);
  text-decoration: none;
}

.hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.topics-overview {
  margin-bottom: 48px;
}

.topic-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.topic-column {
  padding: 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.topic-no {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-deep);
}

.topic-column h3 {
  margin-bottom: 10px;
  font-size: 18px;
}

.topic-column h3 a {
  color: var(--ink);
}

.topic-column h3 a:hover,
.topic-column h3 a:focus-visible {
  color: var(--accent-deep);
}

.topic-trait {
  margin: 0 0 12px;
  font-size: 14px;
  color: var(--ink-soft);
}

.topic-samples {
  margin: 0;
  font-size: 13px;
}

.topic-samples a {
  margin-right: 10px;
  color: var(--ink-soft);
}

.topic-samples a:hover,
.topic-samples a:focus-visible {
  color: var(--accent-deep);
}

.home-pair {
  display: grid;
  grid-template-columns: minmax(520px, 1.6fr) minmax(280px, 1fr);
  gap: 40px;
  align-items: start;
  padding-bottom: 40px;
  margin-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.cover-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.cover-card a {
  display: block;
  padding: 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.cover-card a:hover,
.cover-card a:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 4px 14px rgba(42, 38, 34, 0.08);
  text-decoration: none;
}

.cover-card img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 4px;
  background: var(--surface-warm);
}

.cover-name {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  font-weight: 600;
}

.cover-tag,
.cover-status {
  display: inline-block;
  margin-top: 6px;
  margin-right: 8px;
  font-size: 12px;
  color: var(--ink-soft);
}

.cover-tag {
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface-warm);
}

.update-stream {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.update-stream .section-head {
  margin-bottom: 14px;
}

.update-list {
  display: flex;
  flex-direction: column;
}

.update-stream .update-row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr);
  gap: 4px 12px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

.update-stream .update-row:last-child {
  border-bottom: 0;
}

.update-stream .update-row time {
  grid-row: span 2;
  font-size: 13px;
  color: var(--ink-soft);
}

.update-name {
  font-weight: 600;
}

.update-change {
  grid-column: 2;
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.update-tag {
  grid-column: 2;
  justify-self: start;
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface-warm);
  font-size: 12px;
  color: var(--ink-soft);
}

.aside-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-soft);
}

.site-index {
  margin-bottom: 48px;
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 16px;
}

.index-cell {
  padding: 16px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.index-cell h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

.index-cell h3 a {
  color: var(--ink);
}

.index-cell h3 a:hover,
.index-cell h3 a:focus-visible {
  color: var(--accent-deep);
}

.index-cell p {
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ============================================================
   pages — topics
   ============================================================ */

.topic-groups {
  margin-bottom: 48px;
}

.topic-group {
  padding: 24px;
  margin-bottom: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  scroll-margin-top: 20px;
}

.topic-group-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 16px;
}

.topic-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-deep);
}

.topic-name {
  margin: 0;
  font-size: 21px;
}

.topic-media {
  margin-bottom: 16px;
}

.topic-media img {
  width: 100%;
  max-height: 240px;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.topic-desc {
  max-width: 820px;
  font-size: 15px;
  color: var(--ink-soft);
}

.topic-points {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 24px;
  margin-bottom: 20px;
}

.topic-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--ink-soft);
}

.topic-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.entries-title {
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--ink-soft);
  font-weight: 600;
}

.entry-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.entry-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px;
  background: var(--surface-warm);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.entry-name {
  font-size: 15px;
  font-weight: 600;
}

.entry-tag,
.entry-status {
  align-self: flex-start;
  font-size: 12px;
  color: var(--ink-soft);
}

.entry-tag {
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface);
}

.topic-scope {
  margin-bottom: 48px;
}

.scope-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

.scope-col {
  padding: 18px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scope-name {
  margin-bottom: 8px;
  font-size: 16px;
}

.scope-text {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.scope-note {
  font-size: 14px;
  color: var(--ink-soft);
}

.scope-note a {
  margin-right: 14px;
}

.field-summary {
  margin-bottom: 24px;
}

.field-table {
  margin-bottom: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.field-table th {
  padding: 12px 16px;
  background: var(--surface-warm);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.field-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink-soft);
}

.field-table tr:last-child td {
  border-bottom: 0;
}

.field-table td:first-child {
  color: var(--ink);
  font-weight: 600;
}

.field-note {
  font-size: 14px;
  color: var(--ink-soft);
}

/* ============================================================
   pages — updates
   ============================================================ */

.update-batches {
  margin-bottom: 48px;
}

.batch-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.batch-card {
  padding: 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.batch-no {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-deep);
}

.batch-name {
  margin-bottom: 10px;
  font-size: 17px;
}

.batch-desc {
  margin: 0 0 12px;
  font-size: 14px;
  color: var(--ink-soft);
}

.batch-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

.batch-meta li {
  padding: 2px 10px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface-warm);
}

.update-list-section {
  margin-bottom: 48px;
}

.update-list-section .update-list {
  gap: 0;
}

.update-list-section .update-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 0 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.update-list-section .update-row:first-child {
  border-top: 1px solid var(--line);
}

.update-thumb {
  grid-row: span 1;
}

.update-thumb img {
  width: 96px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface-warm);
}

.update-body {
  min-width: 0;
}

.update-date {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--ink-soft);
}

.update-title {
  margin: 0 0 6px;
  font-size: 17px;
}

.update-title a {
  color: var(--ink);
}

.update-title a:hover,
.update-title a:focus-visible {
  color: var(--accent-deep);
}

.update-list-section .update-change {
  margin: 0 0 6px;
  font-size: 14px;
  color: var(--ink-soft);
}

.update-list-section .update-tag {
  display: inline-block;
}

.follow-tips {
  margin-bottom: 24px;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.tip-card {
  padding: 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.tip-name {
  margin-bottom: 10px;
  font-size: 17px;
}

.tip-desc {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

/* ============================================================
   pages — ranking
   ============================================================ */

.ranking-list-section,
.rank-rule-section,
.rank-cross-section {
  margin-bottom: 48px;
}

.ranking-list {
  border-top: 1px solid var(--line);
}

.ranking-item {
  display: grid;
  grid-template-columns: 46px 84px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.rank-no {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--accent-deep);
}

.rank-cover {
  margin: 0;
}

.rank-cover img {
  width: 84px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface-warm);
}

.rank-body {
  min-width: 0;
}

.rank-name {
  margin: 0 0 6px;
  font-size: 17px;
}

.rank-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 6px;
}

.rank-tags .tag {
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface-warm);
  font-size: 12px;
  color: var(--ink-soft);
}

.rank-note {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.rank-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 14px;
  color: var(--ink);
  white-space: nowrap;
}

.rank-link:hover,
.rank-link:focus-visible {
  border-color: var(--accent);
  color: var(--accent-deep);
  text-decoration: none;
}

.rule-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.rule-block {
  padding: 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.rule-name {
  margin-bottom: 10px;
  font-size: 17px;
}

.rule-text {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.cross-layout {
  display: grid;
  grid-template-columns: minmax(520px, 1.6fr) minmax(280px, 1fr);
  gap: 32px;
  align-items: start;
}

.cross-table {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.cross-table caption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--ink-soft);
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.cross-table th {
  padding: 11px 16px;
  background: var(--surface-warm);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  font-weight: 600;
}

.cross-table td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink-soft);
}

.cross-table tr:last-child td {
  border-bottom: 0;
}

.cross-side {
  padding: 22px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.cross-side-title {
  margin-bottom: 10px;
  font-size: 17px;
}

.cross-side-text {
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--ink-soft);
}

.cross-side-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cross-side-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-warm);
  font-size: 14px;
  color: var(--ink);
}

.cross-side-list a:hover,
.cross-side-list a:focus-visible {
  border-color: var(--accent);
  color: var(--accent-deep);
  text-decoration: none;
}

/* ============================================================
   pages — fields
   ============================================================ */

.page-hero-media {
  margin-top: 18px;
}

.page-hero-media img {
  width: 100%;
  max-height: 260px;
  aspect-ratio: 16 / 6;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.fields-list,
.fields-faq,
.fields-path {
  margin-bottom: 48px;
}

.field-table[role="table"] {
  display: block;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.field-row {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) minmax(220px, 1.6fr) minmax(160px, 1fr);
  border-bottom: 1px solid var(--line);
}

.field-row:last-child {
  border-bottom: 0;
}

.field-row-head {
  background: var(--surface-warm);
}

.field-cell {
  padding: 12px 16px;
  font-size: 14px;
  color: var(--ink-soft);
}

.field-row-head .field-cell {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.field-name {
  font-weight: 600;
  color: var(--ink);
}

.field-sample {
  font-family: var(--font-mono);
  font-size: 13px;
}

.fields-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--ink-soft);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.faq-item summary {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::before {
  content: "＋";
  display: inline-block;
  width: 20px;
  font-family: var(--font-mono);
  color: var(--accent-deep);
}

.faq-item[open] summary::before {
  content: "－";
}

.faq-item summary:hover,
.faq-item summary:focus-visible {
  color: var(--accent-deep);
}

.faq-item p {
  margin: 12px 0 0;
  padding-left: 20px;
  font-size: 14px;
  color: var(--ink-soft);
}

.path-map {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.path-map-item {
  padding: 18px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.path-map-item h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

.path-map-item p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.fields-back {
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-soft);
}

/* ============================================================
   pages — guide
   ============================================================ */

.guide-steps,
.guide-collect,
.guide-feedback,
.guide-related {
  margin-bottom: 48px;
}

.guide-figure {
  margin-bottom: 24px;
}

.guide-figure img {
  width: 100%;
  max-height: 280px;
  aspect-ratio: 16 / 6;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.step-item {
  padding: 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-no {
  display: inline-block;
  margin-bottom: 10px;
  padding: 1px 10px;
  border: 1px solid var(--accent);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-deep);
}

.step-name {
  margin-bottom: 8px;
  font-size: 17px;
}

.step-desc {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.collect-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.collect-card {
  padding: 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.collect-name {
  margin-bottom: 10px;
  font-size: 17px;
}

.collect-text {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.feedback-note {
  margin-top: 18px;
  font-size: 14px;
  color: var(--ink-soft);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.related-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--ink);
}

.related-list a:hover,
.related-list a:focus-visible {
  border-color: var(--accent);
  color: var(--accent-deep);
  text-decoration: none;
}

/* ============================================================
   pages — 404
   ============================================================ */

.error-main {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 48px;
  padding-bottom: 72px;
}

.error-hero {
  max-width: 640px;
  margin-bottom: 40px;
}

.error-code {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent-deep);
}

.error-text {
  margin: 0 0 20px;
  font-size: 15px;
  color: var(--ink-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.error-btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
}

.error-btn:hover,
.error-btn:focus-visible {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
  color: #FBF7F0;
  text-decoration: none;
}

.error-btn-plain {
  background: var(--surface);
  border-color: var(--line);
  font-weight: 400;
}

.error-btn-plain:hover,
.error-btn-plain:focus-visible {
  background: var(--surface-warm);
  border-color: var(--accent);
  color: var(--accent-deep);
}

.error-paths {
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.error-paths-desc {
  max-width: 640px;
  font-size: 15px;
  color: var(--ink-soft);
}

.error-path-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.error-path-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--ink);
}

.error-path-list a:hover,
.error-path-list a:focus-visible {
  border-color: var(--accent);
  color: var(--accent-deep);
  text-decoration: none;
}

/* ============================================================
   responsive
   ============================================================ */

@media (max-width: 1024px) {
  .hero,
  .home-pair,
  .cross-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .topic-columns,
  .scope-columns,
  .path-map,
  .related-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .index-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .rule-grid,
  .step-list,
  .collect-grid,
  .batch-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .site-header,
  .site-main,
  .site-footer,
  .fact-bar p,
  .top-fact-bar p {
    padding-left: 16px;
    padding-right: 16px;
  }

  .site-main {
    padding-top: 24px;
    padding-bottom: 48px;
  }

  .inner-main {
    padding-top: 16px;
  }

  .site-header {
    flex-wrap: nowrap;
    justify-content: space-between;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: relative;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    z-index: 20;
    width: min(280px, calc(100vw - 32px));
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(42, 38, 34, 0.12);
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-list li {
    border-bottom: 1px solid var(--line);
  }

  .nav-list li:last-child {
    border-bottom: 0;
  }

  .nav-list a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 0 16px;
    border-bottom: 0;
  }

  .nav-list a.is-current {
    background: var(--surface-warm);
    border-bottom-color: transparent;
  }

  .page-title,
  .inner-main .page-title {
    font-size: 24px;
  }

  h2 {
    font-size: 21px;
  }

  .hero,
  .home-pair {
    gap: 28px;
    padding-bottom: 28px;
    margin-bottom: 32px;
  }

  .topics-overview,
  .topic-groups,
  .topic-scope,
  .update-batches,
  .update-list-section,
  .ranking-list-section,
  .rank-rule-section,
  .rank-cross-section,
  .fields-list,
  .fields-faq,
  .fields-path,
  .guide-steps,
  .guide-collect,
  .guide-feedback,
  .guide-related,
  .site-index {
    margin-bottom: 36px;
  }

  .topic-columns,
  .scope-columns,
  .path-map,
  .related-list,
  .index-grid,
  .rule-grid,
  .step-list,
  .collect-grid,
  .batch-grid,
  .tips-grid,
  .cover-grid,
  .entry-list,
  .error-path-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .topic-points {
    grid-template-columns: minmax(0, 1fr);
  }

  .topic-group {
    padding: 18px 16px;
  }

  .topic-media img,
  .page-hero-media img,
  .guide-figure img {
    max-height: none;
    aspect-ratio: 16 / 9;
  }

  .update-list-section .update-row {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 0 14px;
  }

  .update-thumb img {
    width: 72px;
  }

  .ranking-item {
    grid-template-columns: 34px 64px minmax(0, 1fr);
    gap: 12px;
    align-items: start;
  }

  .rank-cover img {
    width: 64px;
  }

  .rank-link {
    grid-column: 2 / -1;
    justify-self: start;
  }

  .field-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .field-cell {
    padding: 10px 14px;
  }

  .field-row .field-cell + .field-cell {
    padding-top: 0;
  }

  .field-table th,
  .field-table td,
  .cross-table th,
  .cross-table td {
    padding: 10px 12px;
  }

  .site-footer {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .footer-brand {
    grid-column: 1;
  }

  .error-main {
    padding-top: 32px;
    padding-bottom: 48px;
  }
}

@media (max-width: 480px) {
  .brand-sub {
    display: none;
  }

  .hero-paths a,
  .rank-link,
  .cross-side-list a,
  .related-list a,
  .error-path-list a {
    width: 100%;
    justify-content: center;
  }
}