:root {
  --ink: #1b1917;
  --paper: #f6f1e6;
  --paper-deep: #e8dfcc;
  --paper-line: #d8cdb6;
  --seal: #a8352a;
  --pine: #2f4a45;
  --muted: #8c8272;
  --page-width: 1120px;
  --read-width: 760px;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", Arial, sans-serif;
  --mono: "SFMono-Regular", "Menlo", "Consolas", "Courier New", monospace;
}

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

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

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

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

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

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

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

p {
  margin: 0;
}

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

figure {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============ layout ============ */
.site-header {
  border-bottom: 1px solid var(--paper-line);
  background-color: var(--paper);
}

.header-top {
  border-bottom: 1px solid var(--paper-line);
  background-color: var(--paper-deep);
}

.header-top-inner {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.header-main {
  position: sticky;
  top: 0;
  z-index: 30;
  background-color: var(--paper);
  box-shadow: 0 1px 0 rgba(27, 25, 23, 0.06);
}

.header-main-inner {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 60px;
}

.nav-note {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 24px 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.site-main {
  display: block;
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--muted);
}

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

.breadcrumb a:hover {
  color: var(--seal);
}

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

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

.page-header {
  padding: 14px 0 18px;
  border-bottom: 1px solid var(--paper-line);
}

.page-title {
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--ink);
  max-width: var(--read-width);
}

.site-footer {
  background-color: var(--paper-deep);
  border-top: 1px solid var(--paper-line);
  margin-top: 40px;
}

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

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-intro {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 34em;
}

.footer-group {
  display: block;
}

.footer-title {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  font-weight: 700;
  margin-bottom: 12px;
  text-transform: uppercase;
}

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

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

.footer-group li a:hover {
  color: var(--seal);
}

.footer-bottom {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid var(--paper-line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}

.footer-copy {
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.footer-scope a {
  color: var(--muted);
}

.footer-scope a:hover {
  color: var(--seal);
}

/* ============ components ============ */
.brand {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.brand:hover {
  color: var(--seal);
  text-decoration: none;
}

.brand-small {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

.brand-small:hover {
  color: var(--seal);
  text-decoration: none;
}

.brand-tagline {
  font-size: 13px;
  color: var(--muted);
  font-family: var(--sans);
  flex: 1 1 auto;
  min-width: 0;
}

.header-quick.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-shrink: 0;
}

.header-quick a {
  font-size: 13px;
  color: var(--pine);
  font-family: var(--sans);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.header-quick a:hover {
  color: var(--seal);
  text-decoration: none;
  border-bottom-color: var(--seal);
}

.header-quick a.is-current {
  color: var(--seal);
  border-bottom-color: var(--seal);
}

.main-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

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

.nav-list li a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 2px solid transparent;
}

.nav-list li a:hover {
  color: var(--seal);
  text-decoration: none;
  border-bottom-color: var(--seal);
}

.desk-entry {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  padding: 6px 12px;
  border: 1px solid var(--seal);
  border-radius: 3px;
  white-space: nowrap;
  flex-shrink: 0;
}

.desk-entry:hover {
  background-color: var(--seal);
  color: var(--paper);
  text-decoration: none;
}

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

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--ink);
}

.mobile-drawer {
  border-top: 1px solid var(--paper-line);
  background-color: var(--paper);
  padding: 8px 24px 20px;
}

.mobile-drawer[hidden] {
  display: none;
}

.drawer-nav {
  display: flex;
  flex-direction: column;
}

.drawer-nav li a {
  display: flex;
  align-items: center;
  min-height: 48px;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 1px solid var(--paper-line);
}

.drawer-quick {
  display: flex;
  flex-direction: column;
  margin-top: 8px;
}

.drawer-quick li a {
  display: flex;
  align-items: center;
  min-height: 48px;
  font-size: 14px;
  color: var(--seal);
}

.tag,
.tag-chip,
.index-tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 2px 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  border: 1px solid var(--seal);
  border-radius: 3px;
  background-color: transparent;
  white-space: nowrap;
}

.tag-chip:hover,
.tag:hover,
.index-tag:hover {
  background-color: var(--seal);
  color: var(--paper);
  text-decoration: none;
}

.code-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  border: 1px solid var(--seal);
  border-radius: 3px;
  padding: 2px 8px;
  white-space: nowrap;
}

.action-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  background-color: var(--seal);
  color: var(--paper);
  font-size: 15px;
  border: 1px solid var(--seal);
  border-radius: 4px;
}

.action-primary:hover {
  background-color: #8f2b22;
  color: var(--paper);
  text-decoration: none;
}

.action-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  background-color: transparent;
  color: var(--pine);
  font-size: 15px;
  border: 1px solid var(--pine);
  border-radius: 4px;
}

.action-secondary:hover {
  background-color: var(--pine);
  color: var(--paper);
  text-decoration: none;
}

.section-more {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--seal);
  border-bottom: 1px solid var(--seal);
  margin-top: 8px;
}

.section-more:hover {
  color: var(--pine);
  border-bottom-color: var(--pine);
  text-decoration: none;
}

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

.section-head h2 {
  font-size: 22px;
  margin-bottom: 6px;
}

.section-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 62em;
}

.section-title {
  font-size: 22px;
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.section-num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--seal);
  font-weight: 400;
}

.section-intro {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 18px;
  max-width: 62em;
}

.section-lead {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 18px;
  max-width: 62em;
}

.related-band {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--paper-line);
}

.related-title {
  font-size: 18px;
  margin-bottom: 14px;
}

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

.related-item {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background-color: var(--paper-deep);
}

.related-item:hover {
  border-color: var(--seal);
  text-decoration: none;
}

.related-item a {
  display: block;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.related-item a:hover {
  color: var(--seal);
  text-decoration: none;
}

.related-item p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.7;
}

.related-links {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
  font-size: 13px;
}

.related-links-label {
  font-family: var(--mono);
  letter-spacing: 0.08em;
  color: var(--muted);
}

.related-links-item {
  color: var(--pine);
}

/* ============ pages: index ============ */
.home-main {
  padding-bottom: 8px;
}

.desk-hero {
  border-bottom: 1px solid var(--paper-line);
  padding: 32px 0 36px;
}

.desk-hero-inner {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

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

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 12px;
}

.hero-content h1 {
  font-size: 34px;
  line-height: 1.3;
  margin-bottom: 14px;
  max-width: 22em;
}

.hero-lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 40em;
  margin-bottom: 20px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.desk-panel {
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  background-color: var(--paper-deep);
  padding: 20px 22px 22px;
  min-width: 0;
}

.panel-title {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--seal);
  font-weight: 700;
  margin-bottom: 14px;
}

.panel-status {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--paper-line);
  font-size: 13px;
}

.status-label {
  font-family: var(--mono);
  letter-spacing: 0.04em;
  color: var(--muted);
  flex-shrink: 0;
}

.status-value {
  color: var(--ink);
  text-align: right;
}

.panel-subtitle {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  font-weight: 700;
  margin: 18px 0 10px;
}

.panel-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
  padding: 8px 10px;
  border-left: 3px solid transparent;
  background-color: var(--paper);
  border-radius: 3px;
}

.step-item.is-current {
  border-left-color: var(--seal);
}

.step-num {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--seal);
  flex-shrink: 0;
  padding-top: 2px;
}

.hero-figure {
  max-width: var(--page-width);
  margin: 28px auto 0;
  padding: 0 24px;
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
}

.hero-figure figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.section-inner {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 0 24px;
}

.channel-strip {
  padding: 44px 0;
  border-bottom: 1px solid var(--paper-line);
}

.channel-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--paper-line);
}

.channel-row {
  border-bottom: 1px solid var(--paper-line);
}

.channel-row > a {
  display: grid;
  grid-template-columns: 84px minmax(0, 1.1fr) minmax(0, 1.4fr) minmax(0, 1.4fr);
  align-items: center;
  gap: 16px;
  padding: 14px 8px;
  min-height: 56px;
  color: var(--ink);
}

.channel-row > a:hover {
  background-color: var(--paper-deep);
  text-decoration: none;
}

.channel-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
}

.channel-name {
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.channel-form,
.channel-scene {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.topic-preview {
  padding: 44px 0;
  border-bottom: 1px solid var(--paper-line);
}

.topic-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.topic-feature {
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  overflow: hidden;
  background-color: var(--paper-deep);
}

.topic-cover {
  margin: 0;
}

.topic-cover img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.topic-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  padding: 16px 20px 0;
}

.topic-name {
  font-size: 19px;
  padding: 6px 20px 0;
}

.topic-summary {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  padding: 8px 20px 0;
}

.topic-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin: 10px 20px 16px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--seal);
  border-bottom: 1px solid var(--seal);
}

.topic-link:hover {
  color: var(--pine);
  border-bottom-color: var(--pine);
  text-decoration: none;
}

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

.topic-item {
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  padding: 16px 18px;
  background-color: var(--paper);
}

.topic-item .topic-code {
  padding: 0;
  margin-bottom: 4px;
}

.topic-item .topic-name {
  padding: 0;
  font-size: 17px;
}

.topic-item .topic-summary {
  padding: 6px 0 0;
}

.topic-item .topic-link {
  margin: 8px 0 0;
}

.volume-preview {
  padding: 44px 0;
  border-bottom: 1px solid var(--paper-line);
}

.volume-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--paper-line);
}

.volume-row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 14px 8px;
  border-bottom: 1px solid var(--paper-line);
}

.volume-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  padding-top: 4px;
}

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

.volume-name {
  font-size: 17px;
  margin-bottom: 4px;
}

.volume-summary {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.checklist-brief {
  padding: 44px 0;
  border-bottom: 1px solid var(--paper-line);
}

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

.brief-step {
  border-left: 2px solid var(--paper-line);
  padding: 4px 0 4px 16px;
}

.brief-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  display: block;
  margin-bottom: 6px;
}

.brief-name {
  font-size: 16px;
  margin-bottom: 6px;
}

.brief-rule {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.scope-brief {
  padding: 44px 0;
  border-bottom: 1px solid var(--paper-line);
}

.scope-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.scope-col {
  border-top: 2px solid var(--seal);
  padding-top: 14px;
  min-width: 0;
}

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

.scope-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.help-band {
  padding: 44px 0 56px;
}

.help-band-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.help-list-wrap h2 {
  font-size: 22px;
  margin-bottom: 14px;
}

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

.help-list li a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--ink);
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background-color: var(--paper-deep);
}

.help-list li a:hover {
  border-color: var(--seal);
  color: var(--seal);
  text-decoration: none;
}

.help-note-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.help-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ pages: channel-archive ============ */
.page-title-section {
  padding: 20px 0 24px;
  border-bottom: 1px solid var(--paper-line);
}

.section-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 8px;
}

.page-lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: var(--read-width);
  margin-bottom: 14px;
}

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

.numbering-guide {
  padding: 32px 0 8px;
}

.numbering-guide h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.tag-explain-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.tag-explain {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 14px 16px;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background-color: var(--paper-deep);
  min-width: 0;
}

.tag-explain p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.channel-figure {
  margin: 28px 0 8px;
}

.channel-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
}

.channel-figure figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.channel-list-section {
  padding: 28px 0 8px;
}

.channel-list-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.channel-list-section .channel-row {
  display: grid;
  grid-template-columns: minmax(180px, 1.1fr) minmax(0, 1.5fr) minmax(0, 1.5fr);
  gap: 24px;
  align-items: start;
  padding: 18px 8px;
  border-bottom: 1px solid var(--paper-line);
}

.channel-list-section .channel-row:first-of-type {
  border-top: 1px solid var(--paper-line);
}

.channel-row-code {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  min-width: 0;
}

.channel-row-name {
  font-size: 17px;
}

.channel-row-form,
.channel-row-scene {
  min-width: 0;
}

.row-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 4px;
}

.channel-row-form p:not(.row-label),
.channel-row-scene p:not(.row-label) {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.related-entry-band {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--paper-line);
}

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

.related-entry a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background-color: var(--paper-deep);
}

.related-entry a:hover {
  border-color: var(--seal);
  text-decoration: none;
}

.related-entry-title {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.related-entry-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ============ pages: topic-archive ============ */
.page-title {
  padding-bottom: 4px;
}

.page-title-section .page-code,
.page-title .page-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 8px;
}

.page-layout {
  display: grid;
  gap: 32px;
  align-items: start;
  padding-top: 28px;
}

.layout-shell.sidebar-right {
  grid-template-columns: minmax(0, 1fr) 300px;
}

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

.layout-aside {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.topic-list h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.topic-entry {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 22px;
  padding: 20px 0;
  border-bottom: 1px solid var(--paper-line);
  align-items: start;
}

.topic-entry:first-of-type {
  border-top: 1px solid var(--paper-line);
}

.topic-cover {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
  min-width: 0;
}

.topic-figure {
  margin: 0;
  width: 100%;
}

.topic-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
}

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

.topic-body h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.topic-body .topic-summary {
  padding: 0;
  margin-bottom: 10px;
}

.topic-items {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}

.topic-items li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

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

.topic-plan {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  border-left: 2px solid var(--paper-line);
  padding-left: 12px;
}

.aside-block {
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  background-color: var(--paper-deep);
  padding: 18px 20px;
  min-width: 0;
}

.aside-title {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  font-weight: 700;
  margin-bottom: 12px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-list li a {
  display: flex;
  align-items: center;
  min-height: 40px;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px dashed var(--paper-line);
}

.toc-list li:last-child a {
  border-bottom: none;
}

.toc-list li a:hover {
  color: var(--seal);
  text-decoration: none;
}

.arrange-notes {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--paper-line);
}

.arrange-notes h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

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

.arrange-item {
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  padding: 14px 16px;
  background-color: var(--paper);
  min-width: 0;
}

.arrange-item h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.arrange-item p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

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

.arrange-note a {
  color: var(--seal);
}

/* ============ pages: viewing-checklist ============ */
.page-head {
  padding: 20px 0 24px;
  border-bottom: 1px solid var(--paper-line);
}

.page-head .page-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 8px;
}

.prep-intro {
  padding: 32px 0 8px;
  max-width: var(--read-width);
}

.prep-intro-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  margin-bottom: 20px;
}

.prep-figure {
  margin: 0;
}

.prep-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
}

.prep-figure figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.checklist {
  padding: 32px 0 8px;
}

.checklist-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--paper-line);
  margin-top: 8px;
}

.checklist-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--paper-line);
  align-items: start;
}

.checklist-num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--seal);
  padding-top: 4px;
}

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

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

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

.checklist-col {
  min-width: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  padding-left: 12px;
  border-left: 2px solid var(--paper-line);
}

.checklist-label {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 4px;
}

.order-tips {
  padding: 32px 0 8px;
}

.order-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 8px;
}

.order-step {
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  padding: 16px 18px;
  background-color: var(--paper-deep);
  min-width: 0;
}

.order-step-num {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 8px;
}

.order-step-name {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.order-step-desc {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ pages: volume-archive ============ */
.sidebar-left {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  padding-top: 28px;
}

.side-panel {
  min-width: 0;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
  background-color: var(--paper-deep);
  padding: 18px 20px;
  position: sticky;
  top: 76px;
}

.side-title {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  font-weight: 700;
  margin-bottom: 12px;
}

.volume-index {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.volume-index li a {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px dashed var(--paper-line);
}

.volume-index li:last-child a {
  border-bottom: none;
}

.volume-index li a:hover {
  color: var(--seal);
  text-decoration: none;
}

.side-note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--paper-line);
}

.volume-list h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

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

.volume-item:first-of-type {
  border-top: 1px solid var(--paper-line);
}

.volume-head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.volume-head h3 {
  font-size: 18px;
}

.volume-figure {
  margin: 0 0 14px;
}

.volume-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
}

.volume-figure figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.volume-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 12px;
}

.meta-row {
  min-width: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  border-left: 2px solid var(--paper-line);
  padding-left: 12px;
}

.meta-row dt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 2px;
}

.meta-row dd {
  margin: 0;
}

.volume-summary {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 10px;
}

.volume-summary li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

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

.volume-link {
  font-size: 14px;
}

.volume-link a {
  color: var(--seal);
  border-bottom: 1px solid var(--seal);
  padding-bottom: 1px;
}

.volume-link a:hover {
  color: var(--pine);
  border-bottom-color: var(--pine);
  text-decoration: none;
}

.volume-notes {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--paper-line);
}

.volume-notes h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

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

.note-item {
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  padding: 14px 16px;
  background-color: var(--paper);
  min-width: 0;
}

.note-item h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.note-item p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ pages: scope-notes ============ */
.page-hero {
  padding: 20px 0 24px;
  border-bottom: 1px solid var(--paper-line);
}

.page-hero .page-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 8px;
}

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

.section-anchor-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--paper-line);
}

.section-anchor-bar a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  font-size: 13px;
  color: var(--pine);
  border: 1px solid var(--paper-line);
  border-radius: 3px;
  background-color: var(--paper-deep);
}

.section-anchor-bar a:hover {
  border-color: var(--seal);
  color: var(--seal);
  text-decoration: none;
}

.content-section {
  padding: 32px 0 8px;
  max-width: var(--read-width);
}

.content-section h2 {
  font-size: 22px;
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  scroll-margin-top: 80px;
}

.content-section .section-desc {
  margin-bottom: 16px;
}

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

.note-list li {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  padding: 12px 16px;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background-color: var(--paper);
}

.note-list li strong {
  display: block;
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink);
  margin-bottom: 4px;
}

.numbering-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.numbering-item {
  border: 1px solid var(--paper-line);
  border-top: 2px solid var(--seal);
  border-radius: 4px;
  padding: 14px 16px;
  background-color: var(--paper-deep);
  min-width: 0;
}

.numbering-sample {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 6px;
}

.numbering-name {
  font-size: 15px;
  margin-bottom: 6px;
}

.numbering-text {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.content-figure {
  margin: 20px 0;
}

.content-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 8;
  object-fit: cover;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
}

.content-figure figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

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

.section-foot a {
  color: var(--seal);
  margin-right: 12px;
  border-bottom: 1px solid var(--seal);
}

.section-foot a:hover {
  color: var(--pine);
  border-bottom-color: var(--pine);
  text-decoration: none;
}

.content-section .related-band {
  margin-top: 32px;
}

/* ============ pages: help-desk ============ */
.page-title-block {
  padding: 20px 0 24px;
  border-bottom: 1px solid var(--paper-line);
}

.page-title-block .page-code {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--seal);
  margin-bottom: 8px;
}

.help-categories {
  padding: 32px 0 8px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 8px;
}

.category-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background-color: var(--paper-deep);
  padding: 16px 18px;
  min-width: 0;
}

.category-item h3 {
  font-size: 16px;
}

.category-criterion {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  flex: 1 1 auto;
}

.category-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--seal);
  border-bottom: 1px solid var(--seal);
}

.category-link:hover {
  color: var(--pine);
  border-bottom-color: var(--pine);
  text-decoration: none;
}

.media-figure {
  margin: 24px 0 0;
}

.media-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--paper-line);
  border-radius: 6px;
}

.media-figure figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.help-steps {
  padding: 32px 0 8px;
}

.step-group {
  border-top: 1px solid var(--paper-line);
  padding: 20px 0;
}

.step-group h3 {
  font-size: 17px;
  margin-bottom: 12px;
}

.step-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  counter-reset: helpstep;
}

.step-list li {
  position: relative;
  border-left: 2px solid var(--paper-line);
  padding-left: 14px;
  min-width: 0;
}

.step-name {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}

.step-detail {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

.feedback-notes {
  padding: 32px 0 8px;
}

.notes-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 8px;
}

.notes-list li {
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background-color: var(--paper-deep);
  padding: 14px 16px;
  min-width: 0;
}

.notes-list li h3 {
  font-size: 15px;
  margin-bottom: 6px;
}

.notes-list li p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ pages: 404 ============ */
.error-main {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 48px 24px 64px;
}

.error-hero {
  max-width: var(--read-width);
  padding-bottom: 32px;
  border-bottom: 1px solid var(--paper-line);
}

.error-code {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--seal);
  margin-bottom: 10px;
}

.error-hero h1 {
  font-size: 30px;
  margin-bottom: 12px;
}

.error-lead {
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  margin-bottom: 20px;
}

.error-home {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 22px;
  background-color: var(--seal);
  color: var(--paper);
  font-size: 15px;
  border-radius: 4px;
}

.error-home:hover {
  background-color: #8f2b22;
  color: var(--paper);
  text-decoration: none;
}

.error-paths {
  padding: 32px 0 0;
}

.error-paths h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.error-paths-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 18px;
  max-width: 62em;
}

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

.error-path-list li {
  border: 1px solid var(--paper-line);
  border-radius: 4px;
  background-color: var(--paper-deep);
  padding: 16px 18px;
  min-width: 0;
}

.error-path-list li a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.error-path-list li a:hover {
  color: var(--seal);
  text-decoration: none;
}

.error-path-list li p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ responsive ============ */
@media (max-width: 1024px) {
  .desk-hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .hero-content h1 {
    font-size: 30px;
  }

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

  .layout-shell.sidebar-right {
    grid-template-columns: minmax(0, 1fr);
  }

  .layout-aside {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .layout-aside .aside-block {
    flex: 1 1 260px;
  }

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

  .side-panel {
    position: static;
  }

  .volume-index {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .volume-index li a {
    border: 1px solid var(--paper-line);
    border-radius: 3px;
    padding: 0 12px;
    background-color: var(--paper);
  }

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

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

  .channel-list-section .channel-row {
    grid-template-columns: minmax(160px, 1fr) minmax(0, 1fr) minmax(0, 1fr);
    gap: 18px;
  }
}

@media (max-width: 768px) {
  .header-main-inner {
    min-height: 56px;
    gap: 12px;
  }

  .main-nav {
    display: none;
  }

  .main-nav .nav-list {
    display: none;
  }

  .desk-entry {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .nav-note {
    display: none;
  }

  .header-top-inner {
    gap: 12px;
    padding: 10px 18px;
  }

  .brand {
    font-size: 19px;
  }

  .brand-tagline {
    font-size: 12px;
    flex-basis: 100%;
    order: 3;
  }

  .header-quick.site-nav {
    gap: 12px;
  }

  .header-quick a {
    font-size: 12px;
  }

  .inner-main {
    padding: 0 18px 48px;
  }

  .section-inner,
  .desk-hero-inner,
  .hero-figure,
  .error-main {
    padding-left: 18px;
    padding-right: 18px;
  }

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

  .hero-content h1 {
    font-size: 24px;
  }

  .desk-hero {
    padding: 24px 0 28px;
  }

  .hero-lead {
    font-size: 14px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .action-primary,
  .hero-actions .action-secondary {
    width: 100%;
  }

  .hero-figure img {
    aspect-ratio: 16 / 9;
  }

  .channel-row > a {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 14px 4px;
  }

  .channel-code {
    margin-bottom: 2px;
  }

  .channel-name {
    font-size: 16px;
  }

  .topic-layout {
    gap: 18px;
  }

  .topic-feature {
    border-radius: 4px;
  }

  .volume-row {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 12px;
  }

  .brief-steps,
  .scope-columns,
  .tag-explain-list,
  .numbering-grid,
  .order-steps,
  .step-list,
  .notes-list,
  .error-path-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .channel-list-section .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    padding: 16px 4px;
  }

  .channel-row-form,
  .channel-row-scene {
    border-left: 2px solid var(--paper-line);
    padding-left: 12px;
  }

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

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

  .topic-figure img {
    aspect-ratio: 16 / 9;
  }

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

  .checklist-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
  }

  .checklist-cols {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .checklist-col {
    border-left: none;
    border-top: 1px solid var(--paper-line);
    padding-left: 0;
    padding-top: 8px;
  }

  .checklist-col:first-child {
    border-top: none;
    padding-top: 0;
  }

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

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

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

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 18px 20px;
  }

  .footer-bottom {
    padding: 14px 18px 24px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .breadcrumb {
    padding-top: 16px;
    font-size: 12px;
  }

  .page-header {
    padding: 12px 0 14px;
  }

  .error-hero h1 {
    font-size: 24px;
  }

  .section-anchor-bar {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 14px;
    -webkit-overflow-scrolling: touch;
  }

  .section-anchor-bar a {
    flex-shrink: 0;
  }
}

@media (max-width: 480px) {
  .header-quick a,
  .tag,
  .tag-chip,
  .index-tag,
  .category-link,
  .section-anchor-bar a {
    min-height: 44px;
  }

  .tag,
  .tag-chip,
  .index-tag {
    padding: 4px 10px;
  }

  .section-anchor-bar a {
    padding: 0 14px;
  }

  .hero-tags {
    gap: 6px;
  }

  .desk-panel {
    padding: 16px 16px 18px;
  }

  .status-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
  }

  .status-value {
    text-align: left;
  }

  .hero-content h1 {
    font-size: 22px;
  }

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

  .topic-feature .topic-code,
  .topic-feature .topic-name,
  .topic-feature .topic-summary,
  .topic-feature .topic-link {
    padding-left: 16px;
    padding-right: 16px;
  }

  .topic-feature .topic-link {
    margin-left: 16px;
    margin-right: 16px;
  }
}