:root {
  --ink: #1c1a17;
  --ink-soft: #4a453d;
  --ink-mute: #8a8377;
  --paper: #f4f1ea;
  --panel: #ffffff;
  --accent: #7a6a4f;
  --accent-deep: #5f5238;
  --green: #2f4a3d;
  --line: #ddd6c8;
  --line-soft: #e8e2d6;
  --serif: Georgia, "Songti SC", "SimSun", "Times New Roman", serif;
  --sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --radius: 6px;
  --shell: 1120px;
  --header-h: 64px;
  --gap: 28px;
}

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

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}

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

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

a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}

h1,
h2,
h3,
h4 {
  font-family: var(--serif);
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 12px;
  line-height: 1.4;
}

p {
  margin: 0 0 14px;
  color: var(--ink-soft);
}

ul,
ol {
  margin: 0 0 14px;
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
  color: var(--ink-soft);
}

strong {
  color: var(--ink);
  font-weight: 600;
}

figure {
  margin: 0;
}

figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--ink-mute);
  line-height: 1.6;
}

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

caption {
  caption-side: top;
  text-align: left;
  font-size: 14px;
  color: var(--ink-mute);
  padding-bottom: 10px;
}

th,
td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 15px;
  color: var(--ink-soft);
  vertical-align: top;
}

th {
  color: var(--ink);
  font-weight: 600;
  background: #faf8f3;
  white-space: nowrap;
}

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

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

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

.brand {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
  white-space: nowrap;
  flex: 0 0 auto;
}

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

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

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--ink-soft);
  border-radius: var(--radius);
  border-bottom: 2px solid transparent;
  line-height: 1.4;
}

.nav-list a:hover {
  color: var(--ink);
  background: #f7f4ec;
  text-decoration: none;
}

.nav-list a.is-current {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

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

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

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

.site-footer {
  flex: 0 0 auto;
  background: #241f19;
  color: #cfc7b8;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: minmax(240px, 1.4fr) repeat(4, minmax(140px, 1fr));
  gap: 32px 28px;
}

.footer-name {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 700;
  color: #f3efe6;
  margin-bottom: 6px;
}

.footer-slogan {
  font-size: 14px;
  color: #b3a992;
  margin-bottom: 10px;
}

.footer-desc {
  font-size: 13px;
  line-height: 1.7;
  color: #a49a89;
  margin: 0;
}

.footer-title {
  font-size: 14px;
  font-family: var(--sans);
  font-weight: 600;
  color: #f3efe6;
  margin: 0 0 12px;
}

.footer-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-group li {
  margin-bottom: 8px;
}

.footer-group a {
  font-size: 14px;
  color: #c2b9a8;
}

.footer-group a:hover {
  color: #ffffff;
}

.footer-copy {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid #3a332a;
  font-size: 13px;
  color: #8d8375;
}

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

.top-notice {
  background: #ece6d8;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 18px;
  margin: 24px 0 0;
}

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

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 20px;
  margin-bottom: 22px;
}

.section-head h2 {
  margin: 0;
  font-size: 22px;
}

.section-head p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-mute);
}

.section-title {
  font-size: 22px;
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.section-lead {
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 74ch;
  margin-bottom: 22px;
}

.section-note {
  font-size: 14px;
  color: var(--ink-mute);
  margin-top: 18px;
}

.section-note a {
  margin-right: 16px;
}

.section {
  padding: 44px 0 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-mute);
  padding: 20px 0 4px;
}

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

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

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

.page-header {
  padding: 10px 0 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}

.page-title {
  font-size: 28px;
  margin: 0 0 10px;
}

.page-description,
.page-intro {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 72ch;
  margin: 0;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 40px;
  align-items: start;
  padding-top: 28px;
}

.sidebar-left .page-layout {
  grid-template-columns: 220px minmax(0, 1fr);
}

.page-content,
.layout-content {
  min-width: 0;
}

.page-toc,
.page-aside,
.layout-aside {
  min-width: 0;
}

.page-toc,
.layout-aside {
  position: sticky;
  top: calc(var(--header-h) + 20px);
}

.page-aside {
  align-self: start;
}

.toc-title,
.aside-title {
  font-size: 13px;
  font-family: var(--sans);
  font-weight: 600;
  color: var(--ink-mute);
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.toc-list,
.aside-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-list li,
.aside-nav li {
  margin-bottom: 4px;
}

.toc-list a,
.aside-nav a {
  display: block;
  padding: 7px 0 7px 10px;
  font-size: 14px;
  color: var(--ink-soft);
  border-left: 2px solid transparent;
}

.toc-list a:hover,
.aside-nav a:hover {
  color: var(--ink);
  border-left-color: var(--accent);
  text-decoration: none;
}

.toc-list a.is-active,
.aside-nav a.is-active {
  color: var(--ink);
  font-weight: 600;
  border-left-color: var(--green);
}

.aside-inner {
  padding-right: 4px;
}

.aside-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--ink-mute);
  line-height: 1.7;
}

.field-table {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.field-table th:last-child,
.field-table td:last-child {
  border-right: 0;
}

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

.table-scroll .field-table {
  border: 0;
  border-radius: 0;
  min-width: 620px;
}

.boundary-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.boundary-col {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  min-width: 0;
}

.boundary-title {
  font-size: 17px;
  margin: 0 0 12px;
}

.boundary-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.boundary-list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 10px;
  font-size: 15px;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

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

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

.hero-archive {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 44px;
  align-items: center;
  padding: 40px 0 8px;
}

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

.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 0;
  color: var(--accent);
  margin: 0 0 12px;
}

.hero-title {
  font-size: 32px;
  line-height: 1.35;
  margin: 0 0 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.hero-note {
  font-size: 14px;
  color: var(--ink-mute);
  border-left: 3px solid var(--line);
  padding-left: 12px;
  margin-bottom: 24px;
}

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

.entry-link {
  display: block;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  border-top: 3px solid var(--accent);
}

.entry-link:hover {
  text-decoration: none;
  border-color: var(--accent);
  background: #fbf9f4;
}

.entry-channel {
  border-top-color: var(--green);
}

.entry-special {
  border-top-color: #a8874f;
}

.entry-guide {
  border-top-color: #6b6f5c;
}

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

.entry-desc {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-mute);
}

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

.hero-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e0d3;
}

.channel-glance {
  padding: 56px 0 0;
}

.channel-rows {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.channel-row {
  display: grid;
  grid-template-columns: 88px minmax(140px, 0.8fr) minmax(0, 2fr) auto;
  gap: 18px;
  align-items: baseline;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line-soft);
}

.channel-code {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
}

.channel-topic {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.channel-focus {
  font-size: 15px;
  color: var(--ink-soft);
  min-width: 0;
}

.channel-link {
  font-size: 14px;
  white-space: nowrap;
}

.special-picks {
  padding: 56px 0 0;
}

.pick-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

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

.pick-media {
  margin: 0 0 14px;
}

.pick-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e0d3;
}

.pick-name {
  font-size: 18px;
  margin: 0 0 8px;
}

.pick-theme {
  font-size: 15px;
  margin-bottom: 6px;
}

.pick-reason {
  font-size: 14px;
  color: var(--ink-mute);
  margin: 0;
}

.view-flow {
  padding: 56px 0 0;
}

.flow-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.flow-step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
  margin: 0;
  min-width: 0;
}

.flow-step .step-index {
  display: inline-block;
  font-family: var(--serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-deep);
  border: 1px solid var(--line);
  border-radius: 50%;
  width: 28px;
  height: 28px;
  line-height: 26px;
  text-align: center;
  margin-bottom: 12px;
}

.flow-step .step-name {
  font-size: 17px;
  margin: 0 0 8px;
}

.flow-step .step-check {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.flow-step .step-link {
  font-size: 14px;
}

.record-boundary {
  padding: 56px 0 0;
}

.record-boundary > h2 {
  font-size: 22px;
  margin: 0 0 22px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

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

.record-col .col-title,
.boundary-col .col-title {
  font-size: 17px;
  margin: 0 0 14px;
}

.record-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}

.record-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 15px;
}

.record-more,
.boundary-more {
  font-size: 14px;
  margin: 0;
}

.site-index {
  padding: 56px 0 0;
}

.site-index > h2 {
  font-size: 22px;
  margin: 0 0 22px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.index-columns {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}

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

.index-link {
  display: block;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.index-desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-mute);
  margin: 0;
}

/* ============ pages: channels ============ */

.channel-table {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}

.channel-table .channel-row {
  display: grid;
  grid-template-columns: 96px minmax(150px, 1fr) minmax(0, 2fr) minmax(150px, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-soft);
}

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

.channel-table .channel-row-head {
  background: #faf8f3;
}

.channel-table .channel-row-head .channel-cell {
  font-weight: 600;
  color: var(--ink);
  font-size: 14px;
}

.channel-table .channel-cell {
  min-width: 0;
  font-size: 15px;
  color: var(--ink-soft);
}

.channel-table .col-code {
  font-family: var(--serif);
  font-weight: 700;
  color: var(--accent);
}

.channel-table .col-topic {
  color: var(--ink);
  font-weight: 600;
}

.channel-directions {
  padding-top: 44px;
}

.channel-detail {
  display: grid;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
}

.channel-detail:last-child {
  border-bottom: 0;
}

.channel-figure {
  min-width: 0;
}

.channel-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e0d3;
}

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

.channel-name {
  font-size: 19px;
  margin: 0 0 10px;
}

.channel-body p {
  font-size: 15px;
}

.channel-fields {
  padding-top: 44px;
}

.channel-boundary {
  padding-top: 44px;
}

.channel-mapping {
  padding-top: 44px;
}

.mapping-table {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

/* ============ pages: specials ============ */

.special-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.special-row {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  gap: 26px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
  margin: 0;
}

.special-media {
  min-width: 0;
}

.special-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e0d3;
}

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

.special-name {
  font-size: 19px;
  margin: 0 0 8px;
}

.special-theme {
  font-size: 15px;
  margin-bottom: 6px;
}

.special-meta {
  font-size: 14px;
  color: var(--ink-mute);
  margin: 0;
}

.section-theme {
  padding-top: 44px;
}

.theme-block {
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.theme-block:last-child {
  border-bottom: 0;
}

.theme-name {
  font-size: 18px;
  margin: 0 0 8px;
}

.theme-block p {
  font-size: 15px;
  margin: 0;
  max-width: 74ch;
}

.section-reason {
  padding-top: 44px;
}

.reason-block {
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
}

.reason-block:last-child {
  border-bottom: 0;
}

.reason-media {
  min-width: 0;
}

.reason-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e0d3;
}

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

.reason-name {
  font-size: 19px;
  margin: 0 0 10px;
}

.reason-order {
  margin: 0;
  padding-left: 22px;
}

.reason-order li {
  font-size: 15px;
  margin-bottom: 8px;
}

.section-relation {
  padding-top: 44px;
}

.relation-table {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.section-maintain {
  padding-top: 44px;
}

.maintain-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.maintain-col {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.maintain-title {
  font-size: 17px;
  margin: 0 0 12px;
}

.maintain-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.maintain-list li {
  font-size: 15px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
}

.maintain-list li:last-child {
  border-bottom: 0;
}

.section-next {
  padding-top: 44px;
}

.next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.next-links li {
  margin: 0;
}

.next-links a {
  display: block;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--ink);
}

.next-links a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

/* ============ pages: guide ============ */

.guide-section {
  padding: 44px 0 0;
}

.guide-section h2 {
  font-size: 22px;
  margin: 0 0 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.guide-section > p {
  font-size: 15px;
  max-width: 74ch;
}

.guide-figure {
  margin: 20px 0 24px;
}

.guide-figure img {
  width: 100%;
  max-width: 720px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e0d3;
}

.prepare-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 24px;
}

.prepare-list li {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 15px;
  margin: 0;
}

.prepare-list strong {
  display: block;
  margin-bottom: 4px;
}

.verify-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: verify;
}

.verify-step {
  position: relative;
  padding: 20px 0 20px 56px;
  border-bottom: 1px solid var(--line-soft);
  margin: 0;
  counter-increment: verify;
}

.verify-step::before {
  content: counter(verify, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 22px;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--panel);
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-deep);
  text-align: center;
  line-height: 34px;
}

.verify-step h3 {
  font-size: 18px;
  margin: 0 0 8px;
}

.verify-step .step-check {
  font-size: 15px;
  margin-bottom: 6px;
}

.verify-step .step-result {
  font-size: 14px;
  color: var(--ink-mute);
  margin: 0;
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 18px;
}

.faq-item summary {
  cursor: pointer;
  padding: 14px 28px 14px 0;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  list-style: none;
  position: relative;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 12px;
  font-size: 20px;
  color: var(--accent);
  line-height: 1;
}

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

.faq-item p {
  font-size: 15px;
  margin: 0 0 16px;
  padding-top: 4px;
  border-top: 1px dashed var(--line);
}

.limits-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.limits-list li {
  padding: 14px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  border-radius: var(--radius);
  margin-bottom: 12px;
  font-size: 15px;
}

.limits-list strong {
  display: block;
  margin-bottom: 4px;
}

.guide-back {
  margin-top: 20px;
  font-size: 14px;
}

.guide-back a {
  margin-right: 18px;
}

/* ============ pages: notes ============ */

.page-header-text {
  min-width: 0;
}

.record-block {
  padding: 44px 0 0;
}

.record-block:first-child {
  padding-top: 0;
}

.record-figure {
  margin: 0 0 26px;
}

.record-figure img {
  width: 100%;
  max-width: 760px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  background: #e6e0d3;
}

.stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.stage-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
  margin: 0;
}

.stage-code {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

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

.stage-body p {
  font-size: 15px;
  margin-bottom: 8px;
}

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

.summary-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.summary-item h3 {
  font-size: 17px;
  margin: 0 0 10px;
}

.summary-meta {
  margin: 0;
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 6px 12px;
  font-size: 14px;
}

.summary-meta dt {
  color: var(--ink-mute);
}

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

.next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 24px;
}

.next-list li {
  padding: 12px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
  margin: 0;
}

.record-footnote {
  margin-top: 20px;
  font-size: 14px;
}

.record-footnote a {
  margin-right: 18px;
}

.feedback-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.feedback-list li {
  font-size: 15px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
}

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

.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 72px 24px 96px;
}

.error-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 48px 40px;
  max-width: 720px;
}

.error-code {
  font-family: var(--serif);
  font-size: 44px;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 8px;
  line-height: 1;
}

.error-title {
  font-size: 26px;
  margin: 0 0 12px;
}

.error-text {
  font-size: 16px;
  margin-bottom: 22px;
}

.error-links {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.error-links li {
  margin: 0;
}

.error-links a {
  display: block;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--ink);
}

.error-links a:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.error-note {
  font-size: 14px;
  color: var(--ink-mute);
  margin: 0;
}

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

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

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

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

@media (max-width: 900px) {
  .page-layout,
  .sidebar-left .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-top: 20px;
  }

  .page-toc,
  .page-aside,
  .layout-aside {
    position: static;
    order: 2;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--panel);
    padding: 14px 18px;
  }

  .page-content,
  .layout-content {
    order: 1;
  }

  .page-toc .toc-list,
  .page-aside .toc-list,
  .layout-aside .aside-nav ul {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
  }

  .page-toc .toc-list a,
  .page-aside .toc-list a,
  .layout-aside .aside-nav a {
    border-left: 0;
    padding: 6px 0;
  }
}

@media (max-width: 768px) {
  :root {
    --gap: 20px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    padding: 0 16px;
    position: relative;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 8px 18px rgba(28, 26, 23, 0.08);
  }

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

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

  .nav-list a {
    padding: 12px 10px;
    min-height: 44px;
    display: flex;
    align-items: center;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .nav-list a.is-current {
    border-left-color: var(--accent);
    background: #f7f4ec;
  }

  .home-main,
  .inner-main {
    padding: 0 16px 48px;
  }

  .hero-archive {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding-top: 28px;
  }

  .hero-media {
    order: 2;
  }

  .hero-text {
    order: 1;
  }

  .hero-title {
    font-size: 26px;
  }

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

  .channel-row {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 6px 14px;
    align-items: start;
  }

  .channel-rows .channel-focus,
  .channel-rows .channel-link {
    grid-column: 2 / 3;
  }

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

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

  .record-columns,
  .boundary-columns,
  .maintain-grid,
  .summary-list,
  .prepare-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .channel-table .channel-row {
    grid-template-columns: 80px minmax(0, 1fr);
    gap: 6px 14px;
  }

  .channel-table .channel-row-head {
    display: none;
  }

  .channel-table .col-focus,
  .channel-table .col-scale {
    grid-column: 2 / 3;
  }

  .channel-detail,
  .special-row,
  .reason-block {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

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

  .stage-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .error-panel {
    padding: 32px 22px;
  }

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 20px;
    padding: 36px 16px 20px;
  }

  .footer-copy {
    padding: 14px 16px 24px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 23px;
  }

  .page-title {
    font-size: 23px;
  }

  .section-title,
  .section-head h2,
  .record-boundary > h2,
  .site-index > h2,
  .guide-section h2 {
    font-size: 19px;
  }

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

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

  .record-list li,
  .boundary-list li,
  .maintain-list li {
    font-size: 14px;
  }
}

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