:root {
  --bg: #F7F5F1;
  --surface: #FFFFFF;
  --ink: #1F2328;
  --ink-soft: #5C636B;
  --metal: #A98B5F;
  --tag: #3E6B7A;
  --line: #E4E0D9;
  --update: #7A5C3E;
  --radius: 6px;
  --radius-sm: 4px;
  --font-head: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
  --wrap: 1120px;
  --gutter: 20px;
  --shadow-sm: 0 1px 3px rgba(31, 35, 40, 0.06);
  --shadow-md: 0 4px 14px rgba(31, 35, 40, 0.09);
}

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

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

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover,
a:focus-visible {
  color: var(--metal);
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-head);
  color: var(--ink);
  line-height: 1.35;
  margin: 0 0 12px;
}

p {
  margin: 0 0 12px;
}

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

figure {
  margin: 0;
}

button {
  font: inherit;
}

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

/* ===== layout: shell ===== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background-color: var(--surface);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px var(--gutter);
}

.brand {
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
  white-space: nowrap;
}

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

.brand-slogan {
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
  padding-left: 14px;
  border-left: 1px solid var(--line);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  padding: 10px 14px;
  min-height: 44px;
  background-color: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-list li {
  display: block;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--ink-soft);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--ink);
  background-color: var(--bg);
  text-decoration: none;
}

.nav-list a.is-current {
  color: var(--metal);
  font-weight: 700;
  background-color: var(--bg);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.home-main,
.inner-main,
.error-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 28px var(--gutter) 56px;
}

.site-footer {
  background-color: var(--surface);
  border-top: 1px solid var(--line);
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px var(--gutter) 24px;
}

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

.footer-name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 13.5px;
  color: var(--ink-soft);
  max-width: 320px;
}

.footer-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 10px;
}

.footer-list li {
  margin-bottom: 6px;
}

.footer-list a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--ink-soft);
}

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

.footer-note,
.footer-copy {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
  font-size: 13px;
  color: var(--ink-soft);
}

.footer-note {
  padding-bottom: 8px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.footer-copy {
  padding-bottom: 28px;
}

/* ===== layout: inner pages ===== */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 16px;
}

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

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

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

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

.page-header {
  padding-bottom: 20px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 10px;
}

.page-description {
  max-width: 760px;
  font-size: 15.5px;
  color: var(--ink-soft);
  margin: 0;
}

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

.page-layout > .article-main,
.page-layout > .section {
  min-width: 0;
}

.article-aside {
  min-width: 0;
  position: sticky;
  top: 88px;
}

/* ===== components: shared ===== */

.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-lead,
.section-intro,
.section-desc {
  max-width: 760px;
  font-size: 15px;
  color: var(--ink-soft);
  margin-bottom: 20px;
}

.section-more {
  margin: 18px 0 0;
  font-size: 14px;
}

.section-more a {
  font-weight: 600;
}

.entry-card {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.entry-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.entry-card figure,
.entry-figure,
.entry-cover {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background-color: var(--bg);
}

.entry-card img,
.entry-figure img,
.entry-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.entry-name,
.entry-title {
  font-size: 16px;
  font-weight: 700;
  margin: 12px 12px 6px;
}

.entry-genre,
.entry-field {
  margin: 0 12px 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

.entry-genre {
  color: var(--tag);
}

.update-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

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

.update-item:last-child {
  border-bottom: none;
}

.update-batch {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--update);
  background-color: #F2EDE4;
  border-radius: var(--radius-sm);
  padding: 2px 8px;
  margin-bottom: 6px;
}

.update-name {
  font-size: 15.5px;
  font-weight: 700;
  margin-bottom: 4px;
}

.update-note {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin-bottom: 4px;
}

.update-date {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-soft);
}

.field-list {
  margin: 0;
  border-top: 1px solid var(--line);
}

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

.field-name {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}

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

.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

.related-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--ink);
}

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

/* ===== components: buttons ===== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  background-color: var(--ink);
  color: #FFFFFF;
  border: 1px solid var(--ink);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--metal);
  border-color: var(--metal);
  color: #FFFFFF;
  text-decoration: none;
}

.btn-ghost {
  background-color: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--metal);
  color: var(--metal);
  text-decoration: none;
}

/* ===== pages: home ===== */

.fact-bar {
  font-size: 13px;
  color: var(--ink-soft);
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  margin-bottom: 28px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 40px;
  align-items: start;
  margin-bottom: 56px;
}

.hero-copy {
  min-width: 0;
}

.hero-title {
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 14px;
}

.hero-summary {
  max-width: 560px;
  font-size: 16px;
  color: var(--ink-soft);
  margin-bottom: 24px;
}

.hero-paths {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero-path {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--metal);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
}

.hero-path-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.hero-path p {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.hero-path a {
  font-size: 14px;
  font-weight: 600;
}

.hero-visual {
  min-width: 0;
}

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

.hero-visual figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--ink-soft);
}

.cover-stream {
  margin-bottom: 56px;
}

.cover-grid {
  display: grid;
  gap: 18px;
}

.cover-grid-large {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-bottom: 18px;
}

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

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

.cover-card {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.cover-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cover-figure {
  overflow: hidden;
  background-color: var(--bg);
}

.cover-card-large .cover-figure {
  aspect-ratio: 16 / 10;
}

.cover-card-medium .cover-figure {
  aspect-ratio: 3 / 4;
}

.cover-card-small .cover-figure {
  aspect-ratio: 3 / 4;
}

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

.cover-name {
  font-size: 16px;
  font-weight: 700;
  margin: 12px 14px 6px;
}

.cover-card-large .cover-name {
  font-size: 18px;
}

.cover-card-small .cover-name {
  font-size: 15px;
}

.cover-genre {
  margin: 0 14px 6px;
  font-size: 13px;
  color: var(--tag);
}

.cover-field {
  margin: 0 14px 14px;
  font-size: 13px;
  color: var(--ink-soft);
}

.genre-overview {
  margin-bottom: 56px;
}

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

.genre-column {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.genre-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.genre-scope {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.genre-samples {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.genre-samples li {
  font-size: 13.5px;
  color: var(--ink);
  padding: 4px 0 4px 14px;
  position: relative;
}

.genre-samples li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--metal);
}

.home-split {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  margin-bottom: 56px;
}

.split-main,
.split-aside {
  min-width: 0;
}

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

.column-index {
  margin-bottom: 24px;
}

.column-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.column-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 0;
}

.column-item a {
  display: block;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.column-note {
  display: block;
  font-size: 12.5px;
  color: var(--ink-soft);
}

/* ===== pages: genres ===== */

.page-genres .genre-index {
  margin-bottom: 48px;
}

.genre-index-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.genre-block {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.genre-traits {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.genre-traits li {
  position: relative;
  padding: 4px 0 4px 14px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

.genre-traits li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 13px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--tag);
}

.page-genres .genre-entries {
  margin-bottom: 48px;
}

.genre-entries-group {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.genre-entries-column {
  min-width: 0;
}

.genre-entries-name {
  font-size: 18px;
  font-weight: 700;
  padding-bottom: 8px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

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

.page-genres .classification-note {
  margin-bottom: 48px;
}

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

.note-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.note-item dt {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

/* ===== pages: updates ===== */

.page-updates .section {
  margin-bottom: 48px;
}

.batch-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.batch-item {
  min-width: 0;
}

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

.batch-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 8px;
}

.batch-no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--update);
  background-color: #F2EDE4;
  border-radius: var(--radius-sm);
  padding: 2px 10px;
}

.batch-genre {
  font-size: 12.5px;
  color: var(--tag);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 2px 10px;
  background-color: var(--bg);
}

.batch-meta {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-left: auto;
}

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

.batch-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

.section-media {
  margin-top: 20px;
}

.section-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.section-media figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

.section-fields .field-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  border-top: none;
}

.section-fields .field-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

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

.rhythm-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.rhythm-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

.section-related .related-list {
  margin-top: 4px;
}

/* ===== pages: ranking ===== */

.page-ranking .ranking-section,
.page-ranking .criteria-section,
.page-ranking .advice-section,
.page-ranking .related-section {
  margin-bottom: 48px;
}

.section-head {
  margin-bottom: 20px;
}

.section-head h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

.ranking-visual {
  margin-bottom: 24px;
}

.ranking-visual img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.ranking-visual figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

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

.ranking-item {
  display: grid;
  grid-template-columns: 56px 88px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 16px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.ranking-item:hover {
  border-color: var(--metal);
  box-shadow: var(--shadow-sm);
}

.rank-number {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--metal);
  text-align: center;
}

.rank-cover {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--bg);
}

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

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

.rank-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.rank-genre {
  display: inline-block;
  font-size: 12.5px;
  color: var(--tag);
  background-color: var(--bg);
  border-radius: var(--radius-sm);
  padding: 2px 10px;
  margin: 0 0 6px;
}

.rank-field {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin: 0;
}

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

.criteria-card {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.criteria-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.criteria-card p {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0;
}

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

.advice-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.advice-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

/* ===== pages: fields ===== */

.page-fields .field-section,
.page-fields .boundary-section,
.page-fields .path-section,
.page-fields .related-section {
  margin-bottom: 44px;
}

.page-fields .section-title {
  font-size: 24px;
  font-weight: 700;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.field-figure {
  margin-bottom: 22px;
}

.field-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.field-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

.page-fields .field-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: none;
}

.page-fields .field-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--tag);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.page-fields .field-name {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.field-meaning {
  font-size: 14.5px;
  color: var(--ink);
  margin-bottom: 6px;
}

.field-scope {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin: 0;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.boundary-col {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.boundary-heading {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
}

.boundary-in .boundary-heading {
  color: var(--tag);
}

.boundary-out .boundary-heading {
  color: var(--update);
}

.boundary-list li {
  position: relative;
  padding: 5px 0 5px 16px;
  font-size: 14px;
  color: var(--ink-soft);
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--line);
}

.boundary-in .boundary-list li::before {
  background-color: var(--tag);
}

.boundary-out .boundary-list li::before {
  background-color: var(--update);
}

.boundary-note {
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

.path-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  counter-reset: none;
}

.path-step {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.path-step .step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: var(--metal);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 10px;
}

.path-step .step-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

.aside-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.toc {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 20px;
}

.toc-list li {
  margin-bottom: 6px;
}

.toc-list a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--ink-soft);
}

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

.aside-block {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 20px;
}

.aside-heading {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 10px;
}

.aside-terms {
  margin: 0;
}

.aside-terms dt {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--update);
  margin-top: 8px;
}

.aside-terms dt:first-child {
  margin-top: 0;
}

.aside-terms dd {
  margin: 2px 0 0;
  font-size: 13.5px;
  color: var(--ink-soft);
}

.aside-text {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin: 0;
}

/* ===== pages: 404 ===== */

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

.error-hero {
  max-width: 640px;
  margin-bottom: 48px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--metal);
  margin-bottom: 10px;
}

.error-hero h1 {
  font-size: 34px;
  font-weight: 700;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--ink-soft);
  margin-bottom: 22px;
}

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

.error-paths h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 16px;
}

.error-path-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.error-path-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.error-path-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

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

@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    order: 3;
    flex-basis: 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: 1px solid var(--line);
    padding-top: 8px;
  }

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

  .nav-list a {
    display: flex;
    width: 100%;
    min-height: 46px;
    padding: 0 10px;
  }

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

  .article-aside {
    position: static;
  }

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

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

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

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

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

  .note-list,
  .section-fields .field-list,
  .rhythm-list,
  .criteria-grid,
  .advice-list,
  .path-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 12px 16px;
  }

  .brand {
    font-size: 19px;
  }

  .brand-slogan {
    display: none;
  }

  .home-main,
  .inner-main,
  .error-main {
    padding: 20px 16px 44px;
  }

  .hero-title,
  .page-title,
  .error-hero h1 {
    font-size: 26px;
  }

  .section-title,
  .section-head h2,
  .error-paths h2 {
    font-size: 21px;
  }

  .page-header {
    margin-bottom: 22px;
  }

  .cover-grid-large,
  .cover-grid-medium,
  .cover-grid-small,
  .entry-grid,
  .entry-card-grid,
  .genre-columns,
  .column-list,
  .note-list,
  .section-fields .field-list,
  .rhythm-list,
  .criteria-grid,
  .advice-list,
  .path-steps,
  .boundary-grid,
  .error-path-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .cover-grid-large,
  .cover-grid-medium {
    margin-bottom: 16px;
  }

  .cover-card-large .cover-figure {
    aspect-ratio: 16 / 9;
  }

  .ranking-item {
    grid-template-columns: 44px 72px minmax(0, 1fr);
    gap: 12px;
    padding: 12px;
  }

  .rank-number {
    font-size: 18px;
  }

  .batch-meta {
    margin-left: 0;
    flex-basis: 100%;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 32px 16px 20px;
  }

  .footer-note,
  .footer-copy {
    padding-left: 16px;
    padding-right: 16px;
  }

  .related-list a {
    width: 100%;
  }

  .related-list li {
    flex: 1 1 100%;
  }
}