:root {
  --color-primary: #2f5d8a;
  --color-primary-dark: #24486b;
  --color-accent-sakura: #d96b8a;
  --color-accent-green: #5a9e7a;
  --color-accent-orange: #c98a3c;
  --color-bg: #f7f6f3;
  --color-surface: #ffffff;
  --color-text: #2b2b2b;
  --color-muted: #6b6b6b;
  --color-border: #e2e0db;
  --color-border-strong: #c9c6bf;
  --container-max: 1080px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-soft: 0 1px 2px rgba(43, 43, 43, 0.04);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

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

p {
  margin: 0;
}

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

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

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

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

figure {
  margin: 0;
}

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

details summary {
  cursor: pointer;
}

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

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

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
}

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

.home-main,
.inner-main {
  display: block;
}

.inner-main {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 24px 24px 64px;
}

.error-main {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 64px 24px 80px;
}

.site-notice {
  background-color: var(--color-primary);
  color: #f3f6f9;
  font-size: 14px;
  line-height: 1.6;
  padding: 9px 24px;
  text-align: center;
}

.site-notice p {
  max-width: var(--container-max);
  margin: 0 auto;
}

/* ==========================================================================
   components — header / nav
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 12px 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: none;
}

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

.brand-mark {
  display: inline-block;
  flex: 0 0 auto;
  width: 12px;
  height: 24px;
  border-radius: 3px;
  background-color: var(--color-accent-sakura);
}

.brand-name {
  font-size: 19px;
  line-height: 1.3;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.nav-toggle::before {
  content: "菜单";
}

.nav-toggle[aria-expanded="true"]::before {
  content: "收起";
}

.nav-toggle:hover {
  border-color: var(--color-border-strong);
  background-color: #f1f0ec;
}

.site-nav {
  display: block;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 15px;
  text-decoration: none;
  border: 1px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-primary);
  background-color: #f1f0ec;
  border-color: var(--color-border);
  text-decoration: none;
}

.nav-link.is-current {
  color: var(--color-primary);
  font-weight: 700;
  border-color: var(--color-border-strong);
  background-color: #f4f6f8;
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
  font-size: 14px;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-muted);
  text-decoration: none;
}

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

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

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 600;
}

.page-header {
  padding: 0 0 24px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.page-description {
  max-width: 780px;
  font-size: 16px;
  color: var(--color-text);
}

.page-meta {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

/* ==========================================================================
   components — section base
   ========================================================================== */

.section {
  margin-bottom: 56px;
}

.section-head {
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-border);
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
}

.section-desc,
.section-intro,
.section-lead {
  margin-top: 8px;
  max-width: 820px;
  font-size: 15px;
  color: var(--color-muted);
}

.section-more {
  margin-top: 20px;
  font-size: 15px;
}

.section-more a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: none;
  background-color: var(--color-surface);
}

.section-more a:hover,
.section-more a:focus-visible {
  background-color: #f1f0ec;
  border-color: var(--color-primary);
  text-decoration: none;
}

/* ==========================================================================
   components — tags
   ========================================================================== */

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background-color: #eef2f6;
  border: 1px solid #d7e0e8;
  color: var(--color-primary);
  font-size: 13px;
  line-height: 1.6;
}

.tag-genre {
  background-color: #fbeef2;
  border-color: #f0d3dd;
  color: #a84361;
}

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

.hero {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 48px 24px 40px;
}

.hero-kicker {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background-color: #fbeef2;
  color: #a84361;
  font-size: 13px;
  font-weight: 600;
}

.hero-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

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

.hero-note {
  margin-top: 14px;
  max-width: 620px;
  padding-left: 12px;
  border-left: 3px solid var(--color-accent-sakura);
  font-size: 14px;
  color: var(--color-muted);
}

.hero-panel {
  padding: 20px;
  background-color: #fbfaf7;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.hero-panel-title {
  margin-bottom: 14px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
}

.hero-entries {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.hero-entry a {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 10px 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

.hero-entry a:hover,
.hero-entry a:focus-visible {
  border-color: var(--color-primary);
  background-color: #f4f6f8;
  color: var(--color-primary);
  text-decoration: none;
}

.hero-media {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px 44px;
}

.hero-media img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.hero-media figcaption {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

.genre-overview,
.collection-entry,
.viewing-steps,
.field-summary,
.notes-preview,
.site-index {
  max-width: var(--container-max);
  margin: 0 auto 56px;
  padding: 0 24px;
}

.genre-table {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-surface);
}

.genre-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 0.9fr) minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 0;
  border-bottom: 1px solid var(--color-border);
}

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

.genre-head {
  background-color: #f1f0ec;
}

.genre-cell {
  padding: 14px 16px;
  font-size: 15px;
  border-right: 1px solid var(--color-border);
}

.genre-cell:last-child {
  border-right: 0;
}

.genre-head .genre-cell {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 14px;
}

.genre-no {
  color: var(--color-accent-sakura);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.genre-name {
  font-weight: 600;
  color: var(--color-text);
}

.genre-bound,
.genre-ref {
  color: var(--color-muted);
  font-size: 14px;
}

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

.collection-card {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.collection-card:hover {
  border-color: var(--color-border-strong);
  background-color: #fdfcfa;
}

.collection-cover,
.collection-figure {
  overflow: hidden;
  border-radius: var(--radius-md);
  margin-bottom: 14px;
}

.collection-cover img,
.collection-figure img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.collection-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.collection-desc {
  font-size: 15px;
  color: var(--color-text);
}

.collection-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

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

.viewing-steps .step-item {
  position: relative;
  padding: 18px 16px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent-green);
  border-radius: var(--radius-md);
}

.viewing-steps .step-item:hover {
  border-color: var(--color-accent-green);
  background-color: #fdfcfa;
}

.viewing-steps .step-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.viewing-steps .step-check {
  font-size: 14px;
  color: var(--color-muted);
}

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

.field-col {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.field-col-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.field-list {
  margin: 0;
}

.field-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  margin-top: 12px;
}

.field-name:first-of-type {
  margin-top: 0;
}

.field-value {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--color-muted);
}

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

.notes-group {
  padding: 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.notes-month {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent-orange);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

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

.note-item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 4px 10px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--color-border);
}

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

.note-date {
  font-size: 13px;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
}

.note-col {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent-orange);
}

.note-text {
  grid-column: 1 / -1;
  font-size: 14px;
  color: var(--color-text);
}

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

.index-item a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60px;
  padding: 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
}

.index-item a:hover,
.index-item a:focus-visible {
  border-color: var(--color-primary);
  background-color: #f4f6f8;
  text-decoration: none;
}

/* ==========================================================================
   pages — inner shared modules
   ========================================================================== */

.catalog-section,
.boundary-section,
.order-section,
.collections-section,
.rationale-section,
.mapping-section,
.guide-figure,
.field-table-section,
.scope-section,
.guide-steps-section,
.guide-faq-section,
.notes-intro,
.notes-archive,
.notes-reasons,
.notes-mapping {
  margin-bottom: 56px;
}

.catalog-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.catalog-row {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 20px;
  padding: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.catalog-row:hover {
  border-color: var(--color-border-strong);
}

.catalog-media {
  overflow: hidden;
  border-radius: var(--radius-md);
}

.catalog-media img {
  width: 100%;
  height: 150px;
  object-fit: cover;
}

.catalog-media figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-muted);
}

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

.catalog-code {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: #fbeef2;
  color: #a84361;
  font-size: 13px;
  font-weight: 700;
}

.catalog-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.catalog-direction {
  font-size: 15px;
  color: var(--color-text);
}

.catalog-boundary {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

.catalog-samples {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-accent-green);
}

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

.boundary-item {
  padding: 16px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent-sakura);
  border-radius: var(--radius-md);
}

.boundary-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.boundary-text {
  font-size: 14px;
  color: var(--color-muted);
}

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

.order-step {
  padding: 18px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent-green);
  border-radius: var(--radius-md);
}

.order-index {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent-green);
  margin-bottom: 6px;
}

.order-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.order-text {
  font-size: 14px;
  color: var(--color-muted);
}

.order-note {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 20px;
  font-size: 15px;
}

.order-note a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  font-weight: 600;
  text-decoration: none;
}

.order-note a:hover,
.order-note a:focus-visible {
  border-color: var(--color-primary);
  background-color: #f1f0ec;
  text-decoration: none;
}

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

.collection-link {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  min-height: 44px;
  margin-top: 14px;
  padding: 0 16px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.collection-link:hover,
.collection-link:focus-visible {
  border-color: var(--color-accent-green);
  background-color: #f0f6f2;
  text-decoration: none;
}

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

.rationale-item {
  padding: 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.rationale-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.rationale-idea {
  font-size: 15px;
  color: var(--color-text);
}

.rationale-rule {
  margin-top: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

.mapping-table-wrap {
  overflow-x: auto;
}

.mapping-table,
.field-table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.mapping-caption,
.field-table-caption {
  caption-side: top;
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
  color: var(--color-muted);
  background-color: #f1f0ec;
  border-bottom: 1px solid var(--color-border);
}

.mapping-table th,
.mapping-table td,
.field-table th,
.field-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
  text-align: left;
  vertical-align: top;
}

.mapping-table thead th,
.field-table thead th {
  background-color: #f4f6f8;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 14px;
}

.mapping-table tbody th,
.field-table tbody th {
  width: 32%;
  color: var(--color-text);
  font-weight: 600;
}

.mapping-table tbody tr:last-child th,
.mapping-table tbody tr:last-child td,
.field-table tbody tr:last-child th,
.field-table tbody tr:last-child td {
  border-bottom: 0;
}

.mapping-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--color-muted);
}

.media-figure {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

.media-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.media-figure figcaption {
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
}

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

.scope-item {
  padding: 16px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.scope-item-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.scope-item p {
  font-size: 14px;
  color: var(--color-muted);
}

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

.guide-steps-section .step-item {
  padding: 18px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent-orange);
  border-radius: var(--radius-md);
}

.guide-steps-section .step-index {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: #faf1e4;
  color: var(--color-accent-orange);
  font-size: 13px;
  font-weight: 700;
}

.guide-steps-section .step-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.guide-steps-section .step-note {
  font-size: 14px;
  color: var(--color-muted);
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
}

.faq-question {
  padding: 14px 18px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
}

.faq-answer {
  padding: 0 18px 16px;
  font-size: 15px;
  color: var(--color-text);
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
}

.notes-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: 24px;
  align-items: start;
}

.notes-intro-media {
  min-width: 0;
}

.notes-intro-body {
  min-width: 0;
}

.notes-intro-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.notes-intro-body p {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 10px;
}

.notes-month-group {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  margin-bottom: 16px;
  overflow: hidden;
}

.notes-month-toggle {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 48px;
  padding: 12px 18px;
  background-color: #f4f6f8;
  border: 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-accent-orange);
  font-size: 16px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.notes-month-toggle::after {
  content: "收起";
  margin-left: auto;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
}

.notes-month-toggle[aria-expanded="false"]::after {
  content: "展开";
}

.notes-month-toggle:hover {
  background-color: #eceff2;
}

.notes-month-toggle[aria-expanded="false"] + .notes-list {
  display: none;
}

.notes-archive .notes-list {
  padding: 6px 18px 14px;
}

.notes-item {
  display: grid;
  grid-template-columns: 120px 140px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--color-border);
}

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

.notes-date {
  font-size: 14px;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
}

.notes-channel {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent-orange);
}

.notes-summary {
  font-size: 15px;
  color: var(--color-text);
  min-width: 0;
}

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

.reason-card {
  padding: 18px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
}

.reason-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.reason-text {
  font-size: 14px;
  color: var(--color-muted);
}

.reason-text a {
  text-decoration: underline;
}

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

.error-main {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.error-panel {
  width: 100%;
  max-width: 720px;
  padding: 40px 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.error-code {
  font-size: 48px;
  font-weight: 700;
  color: var(--color-accent-sakura);
  line-height: 1.1;
  margin-bottom: 12px;
}

.error-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.error-text {
  font-size: 16px;
  color: var(--color-text);
  margin-bottom: 10px;
}

.error-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.error-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 10px 14px;
  background-color: #fbfaf7;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

.error-links a:hover,
.error-links a:focus-visible {
  border-color: var(--color-primary);
  background-color: #f4f6f8;
  text-decoration: none;
}

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

.site-footer {
  flex-shrink: 0;
  background-color: #2b3a48;
  color: #d8dde2;
  font-size: 14px;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 36px 24px 28px;
}

.footer-back {
  padding-bottom: 20px;
  margin-bottom: 24px;
  border-bottom: 1px solid #3d4d5c;
}

.footer-back-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-back-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: #e6ebef;
  font-weight: 600;
  text-decoration: none;
}

.footer-back-list a:hover,
.footer-back-list a:focus-visible {
  color: #ffffff;
  text-decoration: underline;
}

.footer-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

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

.footer-text {
  font-size: 13px;
  color: #a9b4bd;
  margin-bottom: 10px;
}

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

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: #cdd5db;
  font-size: 14px;
  text-decoration: none;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: #ffffff;
  text-decoration: underline;
}

.footer-copy {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid #3d4d5c;
  font-size: 13px;
  color: #97a2ab;
}

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

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .hero-media img {
    height: 260px;
  }

  .genre-row {
    grid-template-columns: 60px minmax(0, 1fr) minmax(0, 1.2fr);
  }

  .genre-ref {
    grid-column: 2 / -1;
  }

  .genre-head .genre-ref {
    display: none;
  }

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

  .order-list,
  .step-list,
  .steps-list,
  .reason-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (max-width: 768px) {
  .site-notice {
    padding: 8px 16px;
    font-size: 13px;
  }

  .header-inner {
    padding: 10px 16px;
  }

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

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 6px 14px rgba(43, 43, 43, 0.08);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 14px;
    display: none;
  }

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

  .nav-link {
    justify-content: flex-start;
    min-height: 48px;
    padding: 0 12px;
    border-radius: var(--radius-sm);
    font-size: 16px;
  }

  .inner-main {
    padding: 18px 16px 48px;
  }

  .error-main {
    padding: 40px 16px 56px;
  }

  .page-header {
    margin-bottom: 24px;
    padding-bottom: 18px;
  }

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

  .section-title {
    font-size: 20px;
  }

  .section {
    margin-bottom: 40px;
  }

  .genre-overview,
  .collection-entry,
  .viewing-steps,
  .field-summary,
  .notes-preview,
  .site-index {
    margin-bottom: 40px;
    padding: 0 16px;
  }

  .hero-inner {
    padding: 32px 16px 28px;
  }

  .hero-title {
    font-size: 24px;
  }

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

  .hero-media {
    padding: 0 16px 32px;
  }

  .hero-media img {
    height: 200px;
  }

  .genre-row {
    grid-template-columns: 52px minmax(0, 1fr);
  }

  .genre-bound,
  .genre-ref {
    grid-column: 2 / -1;
  }

  .genre-cell {
    padding: 12px;
    font-size: 14px;
  }

  .genre-head .genre-bound,
  .genre-head .genre-ref {
    display: none;
  }

  .collection-grid,
  .collections-section .collection-grid,
  .field-columns,
  .notes-groups,
  .boundary-list,
  .rationale-list,
  .scope-list,
  .order-list,
  .step-list,
  .steps-list,
  .reason-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .catalog-media img {
    height: 180px;
  }

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

  .media-figure img {
    height: 200px;
  }

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

  .notes-item .notes-date,
  .notes-item .notes-channel {
    display: inline-block;
  }

  .error-panel {
    padding: 28px 20px;
  }

  .error-code {
    font-size: 36px;
  }

  .error-title {
    font-size: 24px;
  }

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

  .footer-inner {
    padding: 28px 16px 22px;
  }

  .footer-groups {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .footer-back-list {
    gap: 4px 16px;
  }

  .mapping-table th,
  .mapping-table td,
  .field-table th,
  .field-table td {
    padding: 10px 12px;
    font-size: 14px;
  }

  .mapping-table tbody th,
  .field-table tbody th {
    width: 40%;
  }
}

@media (max-width: 420px) {
  .brand-name {
    font-size: 16px;
  }

  .hero-title,
  .page-title {
    font-size: 22px;
  }

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