:root {
  --paper: #F7F5F1;
  --ink: #14110F;
  --ink-soft: #4A4540;
  --vermillion: #C8332B;
  --line: #D8D3CB;
  --tone: #EFEBE4;
  --deep: #1B1815;
  --serif: 'Noto Serif SC', 'Songti SC', 'STSong', serif;
  --sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --mono: 'SFMono-Regular', Consolas, 'Courier New', monospace;
  --shell: 1120px;
  --gutter: 24px;
}

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

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

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

body.site-body {
  margin: 0;
  padding: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  text-align: left;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

p {
  margin: 0;
}

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

figure {
  margin: 0;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

a {
  color: var(--ink);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}

a:hover,
a:focus-visible {
  color: var(--vermillion);
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--vermillion);
  outline-offset: 3px;
}

.mono-index,
.update-time,
.cover-vol,
.curation-row-no,
.method-no,
.month-code,
.step-num,
.step-number,
.year-suffix,
.term-spell,
.page-meta,
.brand-slogan,
.footer-copy,
.marker-line,
.pair-key {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.eyebrow,
.section-kicker,
.page-kicker {
  display: block;
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--vermillion);
}

.eyebrow-red {
  color: var(--vermillion);
}

.visually-plain {
  margin: 0;
  font-family: var(--serif);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 16px;
  z-index: 60;
  padding: 10px 18px;
  background-color: var(--ink);
  color: var(--paper);
  border-radius: 4px;
}

.skip-link:focus {
  top: 12px;
  color: var(--paper);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--paper);
  border-bottom: 1px solid var(--ink);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 64px;
}

.brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 6px 0;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
}

.brand-slogan {
  font-size: 11px;
  line-height: 1.4;
  color: var(--ink-soft);
}

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

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

.nav-item > a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 11px;
  font-size: 14.5px;
  color: var(--ink);
  border-bottom: 2px solid transparent;
}

.nav-item > a:hover,
.nav-item > a:focus-visible {
  color: var(--vermillion);
  border-bottom-color: var(--vermillion);
}

.nav-item.is-current > a,
.nav-item > a.is-current {
  color: var(--vermillion);
  border-bottom-color: var(--vermillion);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--ink);
}

.site-main {
  display: block;
  width: 100%;
}

.home-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 40px var(--gutter) 64px;
}

.inner-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter) 64px;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

.layout-main {
  min-width: 0;
}

.layout-aside {
  min-width: 0;
}

.section-title {
  font-size: clamp(21px, 2.4vw, 26px);
  margin: 0 0 8px;
}

.section-lead {
  margin: 0 0 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 760px;
}

.text-link {
  display: inline-block;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--vermillion);
  border-bottom: 1px solid var(--vermillion);
  padding-bottom: 1px;
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* breadcrumb + page header, shared by all inner pages */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 24px 0 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

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

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

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

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

.page-header {
  padding: 22px 0 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 34px;
}

.page-title {
  font-family: var(--serif);
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  margin: 0;
  max-width: 820px;
}

.page-description {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.page-lead {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 760px;
}

.page-meta {
  margin: 0;
  color: var(--ink-soft);
}

.page-intro,
.page-head {
  margin: 0 0 34px;
  max-width: 760px;
}

/* ==========================================================================
   components
   ========================================================================== */

/* homepage editorial lead */

.editorial-lead {
  margin: 0 0 48px;
}

.lead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  margin-top: 14px;
}

.lead-primary {
  min-width: 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.lead-figure {
  margin: 0 0 18px;
  border: 1px solid var(--ink);
  overflow: hidden;
  border-radius: 2px;
  aspect-ratio: 16 / 9;
  background-color: var(--tone);
}

.lead-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.lead-title {
  font-size: clamp(22px, 2.6vw, 30px);
  margin: 0 0 12px;
}

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

.lead-title a:hover,
.lead-title a:focus-visible {
  color: var(--vermillion);
}

.lead-desc {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 640px;
}

.lead-secondary {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.lead-item {
  padding: 4px 0 20px;
  border-bottom: 1px solid var(--line);
}

.lead-item + .lead-item {
  padding-top: 22px;
}

.lead-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.lead-item .mono-index {
  margin: 0 0 8px;
  color: var(--vermillion);
}

.lead-item-title {
  font-size: 19px;
  margin: 0 0 8px;
}

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

.lead-item-title a:hover,
.lead-item-title a:focus-visible {
  color: var(--vermillion);
}

.lead-item-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* genre band */

.genre-band {
  margin: 0 0 52px;
  padding: 26px 0 4px;
  border-top: 1px solid var(--ink);
}

.genre-list {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 16px;
}

.genre-list li {
  min-width: 0;
}

.genre-chip {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 6px 8px;
  font-size: 13.5px;
  text-align: center;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper);
  transition: transform 160ms ease, border-color 160ms ease, color 160ms ease;
}

.genre-chip:hover,
.genre-chip:focus-visible {
  transform: translateY(-2px);
  border-color: var(--vermillion);
  color: var(--vermillion);
}

.genre-intro {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 760px;
}

/* cover wall */

.cover-wall {
  margin: 0 0 52px;
}

.cover-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 26px 22px;
}

.cover-card {
  min-width: 0;
}

.cover-card > a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper);
  transition: transform 160ms ease, border-color 160ms ease;
}

.cover-card > a:hover,
.cover-card > a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--vermillion);
}

.cover-card img {
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background-color: var(--tone);
}

.cover-vol {
  margin: 0;
  color: var(--vermillion);
}

.cover-title {
  font-size: 16px;
  margin: 0;
  color: var(--ink);
}

.cover-genre {
  margin: 0;
  font-size: 12.5px;
  color: var(--ink-soft);
}

.cover-desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* home split: updates + rank aside */

.home-split {
  margin: 0 0 52px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

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

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

.update-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.update-item:first-child {
  padding-top: 0;
}

.update-time {
  margin: 0 0 4px;
  color: var(--vermillion);
}

.update-title {
  font-size: 17px;
  margin: 0 0 4px;
}

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

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

.update-meta {
  margin: 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.rank-aside {
  min-width: 0;
  padding: 20px;
  background-color: var(--tone);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.rank-group + .rank-group {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.rank-group-title {
  font-size: 16px;
  margin: 0 0 10px;
}

.rank-list {
  counter-reset: rank;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rank-list li {
  counter-increment: rank;
  display: flex;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
}

.rank-list li::before {
  content: counter(rank, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--vermillion);
  flex-shrink: 0;
  padding-top: 2px;
}

.rank-list a {
  color: var(--ink);
}

.rank-list a:hover,
.rank-list a:focus-visible {
  color: var(--vermillion);
}

/* chronology summary nodes */

.chrono-summary {
  margin: 0 0 52px;
  padding-top: 26px;
  border-top: 1px solid var(--ink);
}

.chrono-nodes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.chrono-node {
  min-width: 0;
  padding: 22px 20px;
  background-color: var(--deep);
  color: var(--paper);
  border-radius: 4px;
}

.chrono-year {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: clamp(38px, 4.6vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--paper);
}

.chrono-desc {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: #D8D3CB;
}

.chrono-node .text-link {
  color: #F0B7B2;
  border-bottom-color: #F0B7B2;
}

.chrono-node .text-link:hover,
.chrono-node .text-link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* home pair: glossary + guide */

.home-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
  margin: 0 0 52px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.glossary-preview,
.guide-preview {
  min-width: 0;
}

.gloss-rows {
  margin: 0 0 16px;
  border-top: 1px solid var(--line);
}

.gloss-row {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.gloss-row dt {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 2px;
}

.gloss-row dt a {
  color: var(--ink);
}

.gloss-row dt a:hover,
.gloss-row dt a:focus-visible {
  color: var(--vermillion);
}

.gloss-row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0 0 16px;
}

.guide-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: start;
}

.guide-step .mono-index {
  grid-row: span 2;
  color: var(--vermillion);
  padding-top: 3px;
}

.guide-step-title {
  font-size: 16px;
  margin: 0;
}

.guide-step-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* boundary band */

.boundary-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px 32px;
  padding: 26px 28px;
  background-color: var(--deep);
  border-radius: 4px;
  color: var(--paper);
}

.boundary-title {
  font-size: 18px;
  margin: 0 0 6px;
  color: var(--paper);
  flex-basis: 100%;
}

.boundary-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  flex: 1 1 420px;
}

.boundary-list li {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: #D8D3CB;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background-color: var(--vermillion);
}

.boundary-link {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper);
  border: 1px solid #6B645C;
  border-radius: 4px;
}

.boundary-link:hover,
.boundary-link:focus-visible {
  color: var(--paper);
  border-color: var(--paper);
}

/* next-step bands shared by inner pages */

.next-steps,
.next-step,
.next-links,
.next-band {
  margin: 44px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--ink);
}

.next-steps-title,
.next-step-text,
.next-links-title,
.next-title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--vermillion);
}

.next-title {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 0;
  color: var(--ink);
}

.next-desc {
  margin: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 720px;
}

.next-steps-list,
.next-links-list,
.next-links,
.next-step-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.next-steps-list li,
.next-links-list li,
.next-links li,
.next-link-item {
  min-width: 0;
}

.next-steps-list a,
.next-links-list a,
.next-links a,
.next-step-link,
.next-link-item a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 18px;
  font-size: 14px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper);
  transition: transform 160ms ease, border-color 160ms ease, color 160ms ease;
}

.next-steps-list a:hover,
.next-links-list a:hover,
.next-links a:hover,
.next-step-link:hover,
.next-link-item a:hover,
.next-steps-list a:focus-visible,
.next-links-list a:focus-visible,
.next-links a:focus-visible,
.next-step-link:focus-visible,
.next-link-item a:focus-visible {
  transform: translateY(-2px);
  border-color: var(--vermillion);
  color: var(--vermillion);
}

.next-links-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.next-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper);
  transition: transform 160ms ease, border-color 160ms ease;
}

.next-link:hover,
.next-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--vermillion);
}

.next-link-label {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.next-link-desc {
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* footer */

.site-footer {
  margin-top: 8px;
  background-color: var(--paper);
  border-top: 1px solid var(--ink);
}

.footer-strip {
  background-color: var(--deep);
  color: var(--paper);
  padding: 26px 0;
}

.footer-strip {
  padding-left: max(var(--gutter), calc((100% - var(--shell)) / 2));
  padding-right: max(var(--gutter), calc((100% - var(--shell)) / 2));
}

.footer-slogan {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.footer-position {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: #D8D3CB;
}

.footer-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 40px var(--gutter) 32px;
}

.footer-col {
  min-width: 0;
}

.footer-brand {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.footer-brand-desc {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 380px;
}

.footer-col-title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--vermillion);
}

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

.footer-links a {
  display: inline-block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--vermillion);
}

.footer-notes {
  margin: 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.footer-bottom {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px var(--gutter) 26px;
  border-top: 1px solid var(--line);
}

.footer-copy {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ==========================================================================
   pages
   ========================================================================== */

/* curation */

.feature-curation {
  margin: 0 0 48px;
}

.feature-media {
  margin: 0 0 22px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  overflow: hidden;
  aspect-ratio: 21 / 9;
  background-color: var(--tone);
}

.feature-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.feature-body {
  max-width: 820px;
}

.feature-body h2 {
  font-size: clamp(23px, 2.8vw, 30px);
  margin: 0 0 12px;
}

.feature-body > p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.feature-order-label {
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--vermillion);
  margin-top: 20px;
}

.feature-order {
  counter-reset: order;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
}

.feature-order li {
  counter-increment: order;
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14.5px;
  line-height: 1.7;
}

.feature-order li::before {
  content: counter(order, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-soft);
  flex-shrink: 0;
}

.curation-list {
  margin: 0 0 48px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.curation-row {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 26px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

.curation-row:first-of-type {
  padding-top: 8px;
}

.curation-row-media {
  margin: 0;
  border: 1px solid var(--ink);
  border-radius: 2px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background-color: var(--tone);
}

.curation-row-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.curation-row-body {
  min-width: 0;
}

.curation-row-no {
  margin: 0 0 6px;
  color: var(--vermillion);
}

.curation-row-body h3 {
  font-size: 20px;
  margin: 0 0 8px;
}

.curation-row-body h3 a {
  color: var(--ink);
}

.curation-row-body h3 a:hover,
.curation-row-body h3 a:focus-visible {
  color: var(--vermillion);
}

.curation-row-tags {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.curation-row-body > p {
  margin: 0 0 10px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.curation-row-link {
  margin: 0;
}

.curation-row-link a {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--vermillion);
  border-bottom: 1px solid var(--vermillion);
}

.curation-row-link a:hover,
.curation-row-link a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.curation-method {
  margin: 0 0 48px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.method-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 32px;
}

.method-item {
  min-width: 0;
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

.method-no {
  margin: 0 0 6px;
  color: var(--vermillion);
}

.method-item h3 {
  font-size: 17px;
  margin: 0 0 6px;
}

.method-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.curation-usage {
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.usage-body {
  max-width: 720px;
}

.usage-body p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.usage-link {
  margin: 8px 0 0;
}

.usage-link a {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--vermillion);
  border-bottom: 1px solid var(--vermillion);
}

.usage-link a:hover,
.usage-link a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* shelf */

.shelf-index {
  margin: 0 0 34px;
  padding: 16px 18px;
  background-color: var(--tone);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.shelf-index-title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.shelf-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.shelf-index-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 4px 14px;
  font-size: 13.5px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper);
}

.shelf-index-list a:hover,
.shelf-index-list a:focus-visible {
  border-color: var(--vermillion);
  color: var(--vermillion);
}

.shelf-group {
  margin: 0 0 40px;
  scroll-margin-top: 84px;
}

.shelf-group-head {
  padding: 0 0 12px;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 20px;
}

.shelf-group-head h2 {
  font-size: clamp(19px, 2.2vw, 23px);
  margin: 0 0 4px;
}

.shelf-group-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.shelf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px 20px;
}

.shelf-card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper);
  transition: transform 160ms ease, border-color 160ms ease;
}

.shelf-card:hover {
  transform: translateY(-2px);
  border-color: var(--vermillion);
}

.shelf-cover {
  margin: 0 0 4px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  overflow: hidden;
  aspect-ratio: 2 / 3;
  background-color: var(--tone);
}

.shelf-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.shelf-vol {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--vermillion);
}

.shelf-title {
  font-size: 16px;
  margin: 0;
}

.shelf-genre {
  margin: 0;
  font-size: 12.5px;
  color: var(--ink-soft);
}

.shelf-item,
.shelf-length {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--ink-soft);
}

.shelf-notes {
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.shelf-notes h2 {
  font-size: 20px;
  margin: 0 0 12px;
}

.shelf-notes > p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 720px;
}

.shelf-pair-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 4px 0 0;
  max-width: 720px;
}

.shelf-pair-list li {
  display: flex;
  gap: 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.pair-key {
  flex-shrink: 0;
  color: var(--vermillion);
}

.shelf-filter {
  padding: 20px;
  background-color: var(--tone);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.filter-title {
  font-size: 18px;
  margin: 0 0 14px;
}

.filter-block {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.filter-label {
  margin: 0 0 4px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--vermillion);
}

.filter-value {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.filter-tips {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.filter-reset {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 14px;
  padding: 0 16px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper);
}

.filter-reset:hover,
.filter-reset:focus-visible {
  border-color: var(--vermillion);
  color: var(--vermillion);
}

/* chronology */

.page-figure {
  margin: 0 0 30px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  overflow: hidden;
  background-color: var(--tone);
}

.page-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.figure-caption {
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  background-color: var(--paper);
}

.year-jump {
  position: sticky;
  top: 64px;
  z-index: 20;
  margin: 0 0 34px;
  background-color: var(--paper);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.year-jump-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.year-jump-item {
  min-width: 0;
}

.year-jump-item a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}

.year-jump-item a:hover,
.year-jump-item a:focus-visible {
  color: var(--vermillion);
  border-bottom-color: var(--vermillion);
}

.year-jump-item.is-current a {
  color: var(--vermillion);
  border-bottom-color: var(--vermillion);
}

.year-section {
  margin: 0 0 46px;
  scroll-margin-top: 120px;
}

.year-head {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  gap: 8px 32px;
  align-items: end;
  padding: 0 0 16px;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 22px;
}

.year-big {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(48px, 7vw, 72px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.year-suffix {
  margin-left: 6px;
  font-size: 13px;
  color: var(--ink-soft);
}

.year-summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 720px;
  padding-bottom: 6px;
}

.year-figure {
  margin: 0 0 22px;
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
  background-color: var(--tone);
}

.year-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.month-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.month-card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: var(--paper);
}

.month-code {
  margin: 0 0 2px;
  color: var(--vermillion);
}

.month-point {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.month-link {
  margin-top: 6px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  align-self: flex-start;
}

.month-link:hover,
.month-link:focus-visible {
  color: var(--vermillion);
  border-bottom-color: var(--vermillion);
}

.archive-note {
  margin: 0 0 8px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.archive-note h2 {
  font-size: 20px;
  margin: 0 0 12px;
}

.archive-note-body p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 720px;
}

/* glossary */

.glossary-body {
  display: flex;
  flex-direction: column;
  gap: 34px;
}

.glossary-group {
  min-width: 0;
}

.group-title {
  font-size: clamp(20px, 2.2vw, 24px);
  margin: 0 0 6px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ink);
}

.group-desc {
  margin: 12px 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 720px;
}

.term-list {
  max-width: 820px;
  margin: 0;
}

.term-name {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.term-list > .term-name:first-of-type {
  padding-top: 0;
  border-top: 0;
}

.term-spell {
  margin-left: 8px;
  font-weight: 400;
  color: var(--ink-soft);
}

.term-def {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.term-example {
  margin: 6px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--line);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.03em;
  line-height: 1.8;
  color: var(--ink-soft);
}

.glossary-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
  background-color: var(--tone);
}

.glossary-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.glossary-figure figcaption {
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  background-color: var(--paper);
}

.glossary-usage {
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.usage-item {
  max-width: 720px;
  margin: 0 0 16px;
}

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

.usage-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* reading guide */

.guide-steps > .section-title {
  margin-bottom: 20px;
}

.step-block {
  max-width: 760px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.step-block:first-of-type {
  border-top: 1px solid var(--ink);
}

.step-num {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--vermillion);
  letter-spacing: 0;
}

.step-title {
  font-size: 20px;
  margin: 0 0 8px;
}

.step-block > p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.step-block > p a {
  color: var(--vermillion);
  border-bottom: 1px solid var(--vermillion);
}

.step-block > p a:hover,
.step-block > p a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.step-figure {
  margin: 0 0 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
  background-color: var(--tone);
}

.step-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.step-figure figcaption {
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  background-color: var(--paper);
}

.step-check {
  margin: 0;
  padding: 10px 14px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  background-color: var(--tone);
  border-left: 2px solid var(--vermillion);
  border-radius: 0 4px 4px 0;
}

.field-guide {
  margin: 40px 0 0;
  padding-top: 26px;
  border-top: 1px solid var(--ink);
}

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

.section-intro {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 720px;
}

.field-list {
  max-width: 820px;
  margin: 0;
}

.field-row {
  display: grid;
  grid-template-columns: minmax(120px, 160px) minmax(0, 1fr);
  gap: 6px 20px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.field-row:last-child {
  border-bottom: 1px solid var(--line);
}

.field-row dt {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--vermillion);
}

.field-row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.reading-list {
  margin: 40px 0 0;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.reading-list > .section-title {
  margin-bottom: 12px;
}

.reading-list > p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 720px;
}

.faq {
  margin: 40px 0 0;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.faq > .section-title {
  margin-bottom: 16px;
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 48px;
  padding: 12px 0;
  font-family: var(--serif);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 400;
  color: var(--vermillion);
}

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

.faq-item summary:hover {
  color: var(--vermillion);
}

.faq-item > p {
  margin: 0 0 16px;
  max-width: 720px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* colophon */

.doc-figure {
  margin: 0 0 30px;
  border: 1px solid var(--line);
  border-radius: 2px;
  overflow: hidden;
  background-color: var(--tone);
}

.doc-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.doc-figure-caption {
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  background-color: var(--paper);
}

.doc-section {
  max-width: 720px;
  margin: 0 0 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.doc-section h2 {
  font-size: clamp(20px, 2.2vw, 24px);
  margin: 0 0 12px;
}

.doc-section > p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.doc-section .boundary-list {
  flex-direction: column;
  gap: 6px;
  margin: 4px 0 0;
}

.doc-section .boundary-list li {
  color: var(--ink-soft);
}

.marker-sample {
  margin: 16px 0 0;
  padding: 14px 16px;
  background-color: var(--tone);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.marker-sample-title {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--vermillion);
}

.marker-line {
  margin: 0 0 4px;
  color: var(--ink-soft);
  word-break: break-word;
}

.step-list {
  counter-reset: docstep;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 16px 0 0;
}

.step-item {
  counter-increment: docstep;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: start;
}

.step-number {
  grid-row: span 2;
  color: var(--vermillion);
  padding-top: 3px;
}

.step-item .step-title {
  font-size: 16px;
  margin: 0;
}

.step-desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.doc-note {
  margin: 16px 0 0;
  padding: 10px 14px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-soft);
  background-color: var(--tone);
  border-left: 2px solid var(--vermillion);
  border-radius: 0 4px 4px 0;
}

.next-band {
  max-width: 720px;
}

.next-band .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 404 */

.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 60px var(--gutter) 80px;
}

.error-block {
  max-width: 640px;
}

.error-code {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--vermillion);
}

.error-block h1 {
  font-size: clamp(26px, 3.4vw, 38px);
  margin: 0 0 12px;
}

.error-desc {
  margin: 0 0 22px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.error-paths {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 24px;
}

.error-paths a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 16px;
  font-size: 14px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
}

.error-paths a:hover,
.error-paths a:focus-visible {
  border-color: var(--vermillion);
  color: var(--vermillion);
}

.error-actions {
  margin: 0;
}

.error-home {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--paper);
  background-color: var(--ink);
  border-radius: 4px;
}

.error-home:hover,
.error-home:focus-visible {
  color: var(--paper);
  background-color: var(--vermillion);
}

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

@media (max-width: 1024px) {
  .header-inner {
    gap: 14px;
  }

  .nav-item > a {
    padding: 0 8px;
    font-size: 14px;
  }

  .lead-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 30px;
  }

  .genre-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 30px;
  }

  .curation-row {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 20px;
  }

  .footer-columns {
    gap: 30px;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    padding: 0 var(--gutter);
    background-color: var(--paper);
    border-bottom: 1px solid var(--ink);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 16px;
  }

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

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

  .nav-item > a {
    min-height: 48px;
    padding: 0 4px;
    font-size: 15.5px;
    border-bottom: 2px solid transparent;
  }

  .nav-item.is-current > a,
  .nav-item > a.is-current {
    border-bottom-color: transparent;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .layout-aside {
    order: 2;
  }

  .year-head {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .year-jump {
    top: 56px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    min-height: 56px;
  }

  .brand-name {
    font-size: 19px;
  }

  .brand-slogan {
    font-size: 10.5px;
  }

  .home-main {
    padding: 28px var(--gutter) 48px;
  }

  .inner-main {
    padding-bottom: 48px;
  }

  .breadcrumb {
    padding-top: 18px;
  }

  .page-header {
    padding: 18px 0 20px;
    margin-bottom: 26px;
  }

  .lead-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .lead-figure {
    aspect-ratio: 4 / 3;
  }

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

  .cover-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 16px;
  }

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

  .home-pair {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .boundary-band {
    flex-direction: column;
    align-items: flex-start;
    padding: 22px 20px;
  }

  .boundary-list {
    flex-direction: column;
    gap: 6px;
  }

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

  .curation-row-media {
    aspect-ratio: 16 / 9;
  }

  .method-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .feature-media {
    aspect-ratio: 16 / 9;
  }

  .shelf-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }

  .month-grid {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  }

  .footer-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding-top: 30px;
  }

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

  .field-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .step-block {
    padding: 20px 0;
  }

  .page-figure img,
  .year-figure img,
  .doc-figure img,
  .glossary-figure img,
  .step-figure img {
    aspect-ratio: 16 / 10;
  }
}

@media (max-width: 480px) {
  body.site-body {
    font-size: 15px;
  }

  .home-main,
  .inner-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .header-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .primary-nav {
    padding-left: 16px;
    padding-right: 16px;
  }

  .footer-strip {
    padding-left: 16px;
    padding-right: 16px;
  }

  .footer-columns,
  .footer-bottom {
    padding-left: 16px;
    padding-right: 16px;
  }

  .lead-figure {
    aspect-ratio: 3 / 2;
  }

  .cover-grid {
    gap: 16px 12px;
  }

  .cover-card > a {
    padding: 8px;
    gap: 6px;
  }

  .cover-title {
    font-size: 15px;
  }

  .cover-desc {
    font-size: 12.5px;
  }

  .shelf-grid {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 18px 12px;
  }

  .shelf-card {
    padding: 8px;
  }

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

  .year-big {
    font-size: 46px;
  }

  .step-num {
    font-size: 30px;
  }

  .term-name {
    font-size: 17px;
  }

  .term-spell {
    display: block;
    margin: 2px 0 0;
  }

  .guide-step {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 2px 10px;
  }

  .step-item {
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .next-steps-list,
  .next-links-list,
  .next-links,
  .next-step-links,
  .next-band .next-links {
    flex-direction: column;
    align-items: stretch;
  }

  .next-steps-list a,
  .next-links-list a,
  .next-links a,
  .next-step-link,
  .next-link-item a {
    justify-content: flex-start;
    width: 100%;
  }

  .shelf-index-list a {
    font-size: 13px;
    padding: 4px 12px;
  }

  .year-jump-item a {
    padding: 0 12px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* 程序验收反馈：修复网格孤项 */
@media (min-width: 769px) {
  .cover-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}