:root {
  --bg-page: #F3F5F6;
  --bg-panel: #FFFFFF;
  --bg-subtle: #EAEEF0;
  --text-main: #18242B;
  --text-sub: #5A6B75;
  --text-faint: #7C8B94;
  --accent: #0F7B6C;
  --accent-soft: #E2F0ED;
  --warn: #B66A12;
  --warn-soft: #F8EEDF;
  --danger: #A33D3D;
  --danger-soft: #F7E6E6;
  --link: #1B5E88;
  --line: #D7DFE3;
  --line-strong: #BFCBD1;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-panel: 0 1px 2px rgba(24, 36, 43, 0.05);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
  --header-h: 56px;
  --rail-w: 216px;
  --toc-w: 200px;
  --wrap-max: 1240px;
}

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

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

body {
  margin: 0;
  background: var(--bg-page);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

p {
  margin: 0;
}

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

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

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

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

figure {
  margin: 0;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

.mono,
.batch-badge,
.step-index,
.step-num,
.meta-item,
.status-tag,
.channel-status,
.page-status,
.tag,
.cell-code {
  font-family: var(--font-mono);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 60;
  padding: 8px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--link);
  font-size: 13px;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 8px;
}

/* ==========================================================================
   layout — 页头、侧栏、主区、页脚骨架
   ========================================================================== */

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

.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: var(--wrap-max);
  min-height: var(--header-h);
  margin: 0 auto;
  padding: 0 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
  flex: 0 0 auto;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--text-main);
}

.brand-mark::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  vertical-align: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.brand-tagline {
  font-size: 12px;
  color: var(--text-sub);
  padding-left: 10px;
  border-left: 1px solid var(--line);
  white-space: nowrap;
}

.header-nav {
  display: none;
}

.batch-badge {
  display: inline-flex;
  align-items: center;
  margin-left: auto;
  padding: 3px 8px;
  font-size: 12px;
  color: var(--text-sub);
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: 4px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-panel);
}

.menu-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-main);
  border-radius: 1px;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 24px 20px 48px;
  align-items: start;
}

.page-layout.sidebar-left,
.sidebar-left .page-layout {
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
}

.page-layout.sidebar-left > .site-main,
.sidebar-left .page-layout > .site-main {
  grid-column: 2;
  grid-row: 1;
}

.page-layout.sidebar-left > aside,
.sidebar-left .page-layout > aside {
  grid-column: 1;
  grid-row: 1;
}

.sidebar,
.side-nav,
.side-rail,
.page-sidebar,
.page-aside {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  align-self: start;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 12px;
  box-shadow: var(--shadow-panel);
  font-size: 13px;
  min-width: 0;
}

.sidebar-title,
.side-nav-title,
.rail-title,
.toc-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-faint);
  letter-spacing: 0;
}

.sidebar-list,
.side-nav-list,
.rail-list,
.toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-link,
.side-link,
.rail-link,
.toc-list a {
  display: block;
  padding: 6px 8px;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.sidebar-link:hover,
.side-link:hover,
.rail-link:hover,
.toc-list a:hover {
  background: var(--bg-subtle);
  text-decoration: none;
}

.sidebar-link.is-current,
.side-link.is-current,
.rail-link.is-current,
.nav-link.is-current,
.nav-link.is-active {
  color: var(--accent);
  font-weight: 600;
  background: var(--accent-soft);
}

.sidebar-note,
.side-nav-note,
.rail-meta-note,
.nav-note {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
}

.sidebar-foot,
.side-nav-foot,
.rail-meta {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.sidebar-batch,
.side-nav-batch,
.rail-meta-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  margin-bottom: 2px;
}

.sidebar-boundary,
.side-nav-boundary,
.rail-meta-note {
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
}

.site-main {
  min-width: 0;
  max-width: 100%;
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-sub);
}

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

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

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

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

.page-header {
  margin: 0;
}

.page-title {
  font-size: 28px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-main);
}

.site-footer {
  background: var(--bg-panel);
  border-top: 1px solid var(--line);
  margin-top: 8px;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(0, 2fr);
  gap: 32px;
  max-width: var(--wrap-max);
  margin: 0 auto;
  padding: 28px 20px 16px;
}

.footer-brand-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 6px;
}

.footer-boundary {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
  max-width: 34em;
}

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

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-faint);
  margin-bottom: 8px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-col a {
  color: var(--text-sub);
  font-size: 13px;
  line-height: 1.6;
}

.footer-col a:hover {
  color: var(--link);
}

.footer-note {
  max-width: var(--wrap-max);
  margin: 8px auto 0;
  padding: 12px 20px 20px;
  font-size: 12px;
  color: var(--text-faint);
  border-top: 1px solid var(--line);
}

/* ==========================================================================
   components — 通用组件：链接、步骤、表格、标签、卡片、折叠
   ========================================================================== */

.text-link,
.text-link-primary {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  line-height: 1.5;
  padding: 2px 0;
}

.text-link-primary {
  color: var(--accent);
  font-weight: 600;
}

.text-link::after,
.text-link-primary::after {
  content: "→";
  font-size: 12px;
  transition: transform 0.15s ease;
}

.text-link:hover::after,
.text-link-primary:hover::after {
  transform: translateX(2px);
}

.text-link:hover,
.text-link-primary:hover {
  text-decoration: underline;
}

.status-tag,
.channel-status,
.page-status,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  font-size: 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  white-space: nowrap;
  line-height: 1.6;
}

.status-verified,
.status-checked,
.status-ok,
.tag-ok {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: #C3E0DA;
}

.status-pending,
.tag-warn {
  color: var(--warn);
  background: var(--warn-soft);
  border-color: #EBD3B4;
}

.status-review,
.status-error,
.tag-check {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: #E6C6C6;
}

.status-check {
  color: var(--warn);
  background: var(--warn-soft);
  border-color: #EBD3B4;
}

.page-title-block,
.page-head,
.page-title {
  display: block;
}

.page-summary {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.75;
  max-width: 46em;
}

.page-meta,
.page-title-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-sub);
}

.meta-item {
  font-size: 12px;
  color: var(--text-sub);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-panel);
}

.data-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 13px;
  line-height: 1.6;
}

.data-table caption {
  caption-side: top;
  padding: 10px 14px;
  text-align: left;
  font-size: 12px;
  color: var(--text-faint);
  border-bottom: 1px solid var(--line);
}

.data-table thead th {
  padding: 9px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 12px;
  color: var(--text-sub);
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.data-table tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  color: var(--text-main);
}

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

.data-table tbody tr:hover td {
  background: #FAFCFC;
}

.data-table td a {
  color: var(--link);
}

.data-table .cell-code {
  font-size: 12px;
  color: var(--text-sub);
}

.table-caption {
  caption-side: top;
  text-align: left;
  padding: 8px 0;
  font-size: 12px;
  color: var(--text-faint);
}

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

.step-item {
  position: relative;
  padding: 12px 14px 12px 46px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-index,
.step-num {
  position: absolute;
  left: 12px;
  top: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 50%;
}

.step-item h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.step-item p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

.step-body {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

.content-figure,
.channel-figure,
.article-figure,
.article-media,
.media-figure {
  margin: 0;
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.content-figure img,
.channel-figure img,
.article-figure img,
.article-media img,
.media-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--bg-subtle);
}

.content-figure figcaption,
.channel-figure figcaption,
.article-figure figcaption,
.article-media figcaption,
.media-figure figcaption {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
  border-top: 1px solid var(--line);
  background: var(--bg-panel);
}

.rule-list,
.checklist,
.boundary-list,
.compare-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-sub);
}

.rule-list li,
.checklist li,
.boundary-list li,
.compare-list li {
  position: relative;
  padding-left: 16px;
}

.rule-list li::before,
.checklist li::before,
.boundary-list li::before,
.compare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--line-strong);
}

.rule-list-covered li::before,
.rule-ok li::before,
.checklist li::before {
  background: var(--accent);
}

.rule-list-excluded li::before,
.rule-no li::before,
.boundary-list li::before {
  background: var(--danger);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 14px;
}

.section-head h2,
.section-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
}

.section-desc {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
  max-width: 52em;
}

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

.panel-columns,
.rule-columns,
.two-col,
.compare-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.panel-col,
.rule-col,
.col,
.compare-col {
  min-width: 0;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.panel-col h3,
.rule-col h3,
.col h3,
.compare-col h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.panel-col .text-link,
.rule-col .text-link {
  margin-top: 12px;
}

.mini-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
  counter-reset: mini;
}

.mini-steps li {
  position: relative;
  padding-left: 26px;
  counter-increment: mini;
}

.mini-steps li::before {
  content: counter(mini);
  position: absolute;
  left: 0;
  top: 2px;
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 50%;
}

.faq-item {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 8px;
  overflow: hidden;
}

.faq-item summary {
  padding: 12px 40px 12px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text-faint);
}

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

.faq-item summary:hover {
  background: var(--bg-subtle);
}

.faq-item p {
  padding: 12px 16px 14px;
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.75;
  border-top: 1px solid var(--line);
}

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

.info-item {
  padding: 12px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.info-item h3 {
  font-size: 14px;
  margin-bottom: 4px;
}

.info-item p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

.info-note {
  margin-top: 4px;
  font-size: 12px;
  color: var(--text-faint);
}

.toc {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 12px;
  font-size: 13px;
}

.toc-related {
  margin-top: 4px;
}

.toc-block {
  margin-bottom: 18px;
}

.toc-block:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   pages — 首页
   ========================================================================== */

.home-main {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.hero-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-panel);
}

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 8px;
}

.hero-task h1 {
  font-size: 28px;
  line-height: 1.3;
  margin-bottom: 10px;
}

.hero-lead {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 16px;
  max-width: 40em;
}

.task-steps {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.task-step {
  position: relative;
  padding: 8px 12px 8px 40px;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.65;
}

.task-step .step-index {
  top: 9px;
  left: 10px;
  width: 22px;
  height: 22px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

.hero-figure {
  margin: 0;
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--bg-subtle);
}

.hero-figure figcaption {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
  border-top: 1px solid var(--line);
  background: var(--bg-panel);
}

.status-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.status-cell {
  background: var(--bg-panel);
  padding: 12px 14px;
  min-width: 0;
}

.status-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  margin-bottom: 4px;
}

.status-value {
  display: block;
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.6;
}

.channel-matrix,
.collection-preview,
.dual-panels,
.content-rules,
.update-ledger,
.feedback-strip {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

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

.collection-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.collection-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-panel);
}

.collection-cover {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-subtle);
}

.collection-cover img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--bg-subtle);
}

.collection-card h3 {
  font-size: 15px;
}

.collection-desc {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
  flex: 1 1 auto;
}

.collection-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.6;
}

.dual-panels .panel-col {
  border: 1px solid var(--line);
  background: #FBFCFC;
}

.content-rules > .text-link,
.update-ledger > .text-link {
  margin-top: 14px;
}

.feedback-strip h2 {
  font-size: 18px;
  margin-bottom: 14px;
}

.feedback-cells {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.feedback-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-main);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.feedback-cell:hover {
  background: var(--bg-panel);
  border-color: var(--accent);
  text-decoration: none;
}

.feedback-type {
  font-size: 14px;
  font-weight: 600;
}

.feedback-desc {
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ==========================================================================
   pages — 内页通用文章
   ========================================================================== */

.prose,
.article-body,
.channel-article {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.content-section,
.section-block,
.section,
.content-block {
  display: block;
  min-width: 0;
}

.content-section h2,
.section-block h2,
.section h2,
.content-block h2,
.guide-summary h2,
.guide-steps h2,
.guide-status h2,
.guide-faq h2,
.guide-next h2 {
  font-size: 18px;
  margin-bottom: 10px;
}

.content-section > p,
.section-block > p,
.section > p,
.content-block > p,
.guide-summary > p,
.guide-steps > p,
.guide-status > p,
.guide-faq > p,
.guide-next > p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 12px;
}

.section-lead,
.block-lead {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 14px;
}

.block-tail {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-sub);
}

.section-link {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.two-col .col h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.principle-item {
  padding: 14px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.principle-item h3 {
  font-size: 15px;
  margin-bottom: 4px;
}

.principle-item p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

.principle-item p + p {
  margin-top: 6px;
}

.glossary-table {
  min-width: 480px;
}

.channel-item {
  padding: 14px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
}

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

.channel-scope,
.channel-scene,
.channel-link {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 4px;
}

.channel-link {
  margin-bottom: 0;
}

.field-legend {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 4px 16px;
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
}

.field-legend dt {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
}

.field-legend dd {
  margin: 0;
  color: var(--text-sub);
}

.entry-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 16px;
}

.content-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--toc-w);
  gap: 28px;
  align-items: start;
}

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

.collection-list .collection-card {
  display: grid;
  grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 14px;
}

.collection-figure {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-subtle);
}

.collection-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--bg-subtle);
}

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

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

.collection-fields {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  line-height: 1.7;
}

.collection-link {
  margin-top: 10px;
  display: inline-flex;
  font-size: 13px;
  color: var(--link);
}

.rule-item {
  padding: 14px 16px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.rule-title {
  font-size: 15px;
  margin-bottom: 4px;
}

.rule-summary {
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.7;
  margin-bottom: 4px;
}

.rule-reason,
.rule-example {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

.rule-example {
  margin-top: 4px;
  padding-top: 6px;
  border-top: 1px dashed var(--line);
}

.path-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 14px;
}

.path-link {
  font-size: 13px;
  color: var(--link);
}

.toc-nav {
  margin-bottom: 16px;
}

.toc-nav:last-child {
  margin-bottom: 0;
}

.toc-link {
  display: block;
  padding: 6px 8px;
  color: var(--text-main);
  border-radius: var(--radius-sm);
}

.toc-link:hover {
  background: var(--bg-subtle);
  text-decoration: none;
}

.guide-summary,
.guide-steps,
.guide-status,
.guide-faq,
.guide-next {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.checklist {
  margin: 10px 0 14px;
}

.step-line {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 12px;
}

.step-line .step-item {
  padding-left: 16px;
}

.step-action {
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.7;
}

.step-target,
.step-done {
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.7;
  margin-top: 3px;
}

.step-done {
  color: var(--accent);
}

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

.next-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-main);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.next-card:hover {
  background: var(--bg-panel);
  border-color: var(--accent);
  text-decoration: none;
}

.next-card-title {
  font-size: 14px;
  font-weight: 600;
}

.next-card-desc {
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
}

.guide-related {
  margin-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}

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

.summary-cell {
  padding: 12px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.summary-cell h3 {
  font-size: 14px;
  margin-bottom: 4px;
}

.summary-cell p {
  font-size: 13px;
  color: var(--text-sub);
  line-height: 1.7;
}

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

.link-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s ease;
}

.link-card:hover {
  border-color: var(--accent);
}

.link-card a {
  display: block;
  padding: 12px 14px;
  font-size: 13px;
  color: var(--text-main);
  line-height: 1.6;
}

.link-card a:hover {
  text-decoration: none;
  color: var(--link);
}

.boundary-list {
  margin: 10px 0 14px;
  padding: 12px 14px;
  background: var(--warn-soft);
  border: 1px solid #EBD3B4;
  border-radius: var(--radius);
}

.compare-grid {
  margin-top: 12px;
}

.compare-col h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.entry-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.entry-card {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.15s ease;
}

.entry-card:hover {
  border-color: var(--accent);
}

.entry-card a {
  display: block;
  padding: 12px 14px;
  color: var(--text-main);
}

.entry-card a:hover {
  text-decoration: none;
}

.entry-card-title {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 2px;
}

.entry-card-desc {
  display: block;
  font-size: 12px;
  color: var(--text-sub);
  line-height: 1.6;
}

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

.error-main {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 64px;
}

.error-panel {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--danger);
  margin-bottom: 8px;
}

.error-panel h1 {
  font-size: 26px;
  margin-bottom: 10px;
}

.error-summary {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 8px;
}

.error-hint {
  font-size: 13px;
  color: var(--text-faint);
  line-height: 1.7;
  margin-bottom: 18px;
}

.error-home-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--accent);
  border-radius: var(--radius-sm);
}

.error-home-link:hover {
  background: #0C6659;
  text-decoration: none;
}

.error-paths {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.error-paths h2 {
  font-size: 16px;
  margin-bottom: 10px;
}

.error-path-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
}

.error-path-list a {
  color: var(--link);
}

/* ==========================================================================
   responsive — 1024 / 768 / 480
   ========================================================================== */

@media (max-width: 1024px) {
  :root {
    --rail-w: 200px;
    --toc-w: 180px;
  }

  .page-layout {
    gap: 20px;
    padding: 20px 16px 40px;
  }

  .page-layout.sidebar-left,
  .sidebar-left .page-layout {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
  }

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

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

  .collection-cards .collection-card:last-child {
    grid-column: 1 / -1;
  }

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

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

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

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

@media (max-width: 768px) {
  :root {
    --header-h: 56px;
  }

  body {
    font-size: 16px;
  }

  .header-inner {
    padding: 0 14px;
    gap: 10px;
  }

  .brand-tagline {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
    order: 3;
  }

  .batch-badge {
    margin-left: auto;
    font-size: 11px;
    padding: 2px 6px;
  }

  .header-nav {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 8px 16px rgba(24, 36, 43, 0.08);
    z-index: 45;
  }

  .header-nav .nav-list {
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 8px 12px 14px;
  }

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

  .header-nav .nav-link {
    display: block;
    padding: 11px 10px;
    font-size: 15px;
    border-radius: var(--radius-sm);
    min-height: 44px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding: 16px 14px 36px;
  }

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

  .page-layout.sidebar-left > .site-main,
  .sidebar-left .page-layout > .site-main {
    grid-column: 1;
    grid-row: 1;
  }

  .page-layout.sidebar-left > aside,
  .sidebar-left .page-layout > aside {
    grid-column: 1;
    grid-row: 2;
  }

  .sidebar,
  .side-nav,
  .side-rail,
  .page-sidebar,
  .page-aside {
    position: static;
    top: auto;
  }

  .page-title,
  .hero-task h1 {
    font-size: 24px;
  }

  .page-summary {
    font-size: 15px;
  }

  .hero-workbench,
  .channel-matrix,
  .collection-preview,
  .dual-panels,
  .content-rules,
  .update-ledger,
  .feedback-strip,
  .guide-summary,
  .guide-steps,
  .guide-status,
  .guide-faq,
  .guide-next {
    padding: 16px;
  }

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

  .table-wrap {
    border: 0;
    background: transparent;
    overflow-x: visible;
  }

  .data-table {
    min-width: 0;
    display: block;
  }

  .data-table caption {
    display: block;
    padding: 0 0 8px;
    border-bottom: 0;
  }

  .data-table thead {
    display: none;
  }

  .data-table tbody,
  .data-table tr,
  .data-table td {
    display: block;
    width: 100%;
  }

  .data-table tbody tr {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    margin-bottom: 10px;
    padding: 6px 0;
  }

  .data-table tbody tr:hover td {
    background: transparent;
  }

  .data-table tbody td {
    padding: 6px 14px;
    border-bottom: 0;
  }

  .data-table tbody td + td {
    border-top: 1px dashed var(--line);
  }

  .panel-columns,
  .rule-columns,
  .two-col,
  .compare-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .collection-cards,
  .feedback-cells,
  .entry-cards,
  .next-links,
  .link-cards,
  .summary-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .collection-cards .collection-card:last-child {
    grid-column: auto;
  }

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

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

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

  .field-legend dd {
    margin-bottom: 8px;
  }

  .footer-inner {
    padding: 22px 14px 14px;
  }

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

  .footer-col a {
    display: inline-block;
    padding: 6px 0;
    min-height: 32px;
  }

  .footer-note {
    padding: 12px 14px 20px;
  }

  .error-main {
    padding: 32px 14px 48px;
  }

  .error-panel h1 {
    font-size: 22px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    gap: 14px;
  }

  .hero-actions .text-link-primary,
  .hero-actions .text-link {
    padding: 6px 0;
    min-height: 32px;
  }

  .step-item {
    padding: 12px 12px 12px 42px;
  }

  .step-line .step-item {
    padding-left: 14px;
  }

  .footer-brand-name {
    font-size: 14px;
  }
}