:root {
  --bg-deep: #101A2B;
  --bg-panel: #16223A;
  --card-bg: #F5F7FA;
  --text-body: #1F2733;
  --text-soft: #5A6879;
  --text-invert: #E8EDF4;
  --text-invert-soft: #9DAEC4;
  --accent: #E08A3C;
  --accent-soft: #F0A860;
  --steel: #4C6A8A;
  --line: #D8DEE7;
  --line-dark: #2A3A55;
  --radius: 6px;
  --shell: 1160px;
  --reading: 1080px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --font-narrow: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
}

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

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

body {
  margin: 0;
  background-color: var(--bg-deep);
  color: var(--text-invert);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
}

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

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

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

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

p {
  margin: 0;
}

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

button {
  font-family: inherit;
}

/* ============ base: shell skeleton ============ */

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

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

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  min-height: 44px;
}

.brand-mark {
  display: inline-block;
  width: 10px;
  height: 22px;
  background-color: var(--accent);
  border-radius: 2px;
}

.brand-tag {
  font-family: var(--font-narrow);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-invert);
  line-height: 1.2;
}

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

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

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

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

.nav-item {
  display: block;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 15px;
  color: var(--text-invert-soft);
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.nav-link:hover {
  color: var(--text-invert);
}

.nav-link.is-current {
  color: var(--accent);
  font-weight: 700;
  border-bottom-color: var(--accent);
}

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

.site-footer {
  margin-top: 56px;
  background-color: #0B1320;
  border-top: 1px solid var(--line-dark);
  color: var(--text-invert-soft);
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 40px 24px 28px;
}

.footer-about {
  font-size: 14px;
  color: var(--text-invert-soft);
  max-width: 760px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line-dark);
}

.footer-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
  padding: 28px 0;
}

.footer-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-invert);
  margin-bottom: 12px;
}

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

.footer-link {
  font-size: 14px;
  color: var(--text-invert-soft);
  transition: color 0.18s ease;
}

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

.footer-copy {
  padding-top: 20px;
  border-top: 1px solid var(--line-dark);
  font-size: 13px;
  color: #7E8FA6;
}

/* ============ layout: inner page shell ============ */

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

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-invert-soft);
  padding: 4px 0 0;
}

.breadcrumb a {
  color: var(--text-invert-soft);
  transition: color 0.18s ease;
}

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

.breadcrumb-sep {
  color: #55647E;
}

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

.page-header {
  padding: 20px 0 28px;
  border-bottom: 1px solid var(--line-dark);
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-invert);
}

.page-description {
  margin-top: 12px;
  font-size: 15px;
  color: var(--text-invert-soft);
  max-width: 760px;
}

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

.page-layout.sidebar-left {
  grid-template-columns: 240px minmax(0, 1fr);
}

.page-layout.layout-shell {
  grid-template-columns: minmax(0, 1fr) 280px;
}

.page-layout.layout-single {
  grid-template-columns: minmax(0, 1fr);
  max-width: 860px;
}

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

/* ============ components: section + card base ============ */

.section {
  margin-bottom: 40px;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 20px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-dark);
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-invert);
}

.section-desc,
.section-intro {
  font-size: 14px;
  color: var(--text-invert-soft);
  max-width: 760px;
}

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

.section-more {
  margin-top: 16px;
  font-size: 14px;
}

.text-link {
  color: var(--accent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease;
}

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

.inline-link {
  color: var(--accent);
  border-bottom: 1px solid rgba(224, 138, 60, 0.4);
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  background-color: var(--accent);
  color: #1A1206;
}

.btn-primary:hover {
  background-color: var(--accent-soft);
}

.btn-ghost {
  border-color: var(--line-dark);
  color: var(--text-invert);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* fields table shared */

.field-table {
  width: 100%;
  font-size: 14px;
}

.field-table-caption {
  caption-side: top;
  text-align: left;
  font-size: 13px;
  color: var(--text-invert-soft);
  padding-bottom: 10px;
}

.field-table th {
  text-align: left;
  font-weight: 700;
  font-size: 13px;
  color: var(--text-invert-soft);
  padding: 10px 12px;
  border-bottom: 1px solid var(--line-dark);
}

.field-table td {
  padding: 12px;
  border-bottom: 1px solid var(--line-dark);
  color: var(--text-invert-soft);
  vertical-align: top;
}

.field-name {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  white-space: nowrap;
}

/* related entry list shared */

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

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

.related-link {
  display: block;
  padding: 12px 16px;
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-invert);
  transition: border-color 0.18s ease, color 0.18s ease;
}

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

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

.top-bar {
  background-color: #0B1320;
  border-bottom: 1px solid var(--line-dark);
}

.top-bar-text {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 10px 24px;
  font-size: 13px;
  color: var(--text-invert-soft);
}

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

.hero {
  padding: 48px 0 44px;
  border-bottom: 1px solid var(--line-dark);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 480px);
  gap: 40px;
  align-items: center;
}

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

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 14px;
}

.hero-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--text-invert);
  max-width: 520px;
}

.hero-lead {
  margin-top: 16px;
  font-size: 15px;
  color: var(--text-invert-soft);
  max-width: 540px;
}

.hero-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-dark);
  background-color: var(--bg-panel);
}

.hero-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.hero-caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-invert-soft);
}

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

.channel-list {
  border-top: 1px solid var(--line-dark);
}

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

.channel-row-link {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  padding: 16px 8px;
  transition: background-color 0.18s ease;
}

.channel-row-link:hover {
  background-color: rgba(224, 138, 60, 0.06);
}

.channel-name {
  font-family: var(--font-narrow);
  font-size: 17px;
  font-weight: 700;
  color: var(--text-invert);
}

.channel-row-link:hover .channel-name {
  color: var(--accent);
}

.channel-feature,
.channel-org {
  font-size: 14px;
  color: var(--text-invert-soft);
}

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

.collection-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.collection-card {
  display: flex;
  flex-direction: column;
  background-color: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}

.collection-media {
  margin: 0;
}

.collection-media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.collection-name {
  font-size: 17px;
  color: var(--text-body);
  padding: 14px 16px 0;
}

.collection-desc {
  padding: 8px 16px 0;
  font-size: 14px;
  color: var(--text-soft);
}

.collection-scope {
  padding: 10px 16px 16px;
  margin-top: auto;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--steel);
}

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

.updates-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

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

.update-group {
  margin-bottom: 24px;
}

.update-date {
  font-size: 15px;
  font-family: var(--font-mono);
  color: var(--accent);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-dark);
  margin-bottom: 4px;
}

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

.update-item {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-dark);
  font-size: 14px;
}

.update-name {
  color: var(--text-invert);
}

.update-channel,
.update-collection {
  color: var(--text-invert-soft);
  font-size: 13px;
}

.updates-index {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  padding: 20px;
}

.index-title {
  font-size: 16px;
  color: var(--text-invert);
  margin-bottom: 14px;
}

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

.index-item {
  font-size: 14px;
  min-width: 0;
}

.index-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line-dark);
  font-size: 13px;
  color: var(--text-invert-soft);
}

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

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.guide-fields,
.guide-boundary {
  min-width: 0;
}

.guide-subtitle {
  font-size: 17px;
  color: var(--text-invert);
  margin-bottom: 14px;
}

.boundary-block {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 14px;
  background-color: var(--bg-panel);
}

.boundary-title {
  font-size: 15px;
  margin-bottom: 10px;
  color: var(--text-invert);
}

.boundary-in .boundary-title {
  color: var(--accent);
}

.boundary-out .boundary-title {
  color: var(--steel);
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.boundary-item {
  font-size: 14px;
  color: var(--text-invert-soft);
  padding-left: 14px;
  position: relative;
}

.boundary-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  background-color: var(--accent);
  border-radius: 50%;
}

.boundary-out .boundary-item::before {
  background-color: var(--steel);
}

.section-sitemap {
  padding-top: 44px;
  padding-bottom: 8px;
}

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

.sitemap-col {
  min-width: 0;
  padding-top: 14px;
  border-top: 1px solid var(--accent);
}

.sitemap-title {
  font-size: 16px;
  color: var(--text-invert);
  margin-bottom: 8px;
}

.sitemap-desc {
  font-size: 13px;
  color: var(--text-invert-soft);
  margin-bottom: 12px;
}

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

.channel-index {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  padding: 20px;
  align-self: start;
  position: sticky;
  top: 88px;
}

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

.aside-note {
  font-size: 13px;
  color: var(--text-invert-soft);
  margin-bottom: 14px;
}

.channel-index-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.channel-index-item {
  min-width: 0;
}

.channel-index-link {
  display: block;
  font-size: 14px;
  color: var(--text-invert-soft);
  padding: 6px 0 6px 12px;
  border-left: 2px solid var(--line-dark);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.channel-index-link:hover {
  color: var(--accent);
  border-left-color: var(--accent);
}

.channel-rows {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.channel-catalog .channel-row {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 18px;
  background-color: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.channel-media {
  margin: 0;
}

.channel-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 4px;
}

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

.channel-body .channel-name {
  color: var(--text-body);
  font-size: 18px;
  margin-bottom: 10px;
}

.channel-fields {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.channel-fields .field-name {
  display: block;
  margin-bottom: 2px;
}

.field-value {
  font-size: 14px;
  color: var(--text-soft);
}

.channel-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  color: var(--accent);
  border-bottom: 1px solid transparent;
}

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

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

.choose-block {
  min-width: 0;
  padding: 18px;
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
}

.choose-title {
  font-size: 17px;
  color: var(--text-invert);
  margin-bottom: 10px;
}

.choose-text {
  font-size: 14px;
  color: var(--text-invert-soft);
}

.bridge-table {
  font-size: 14px;
  margin-bottom: 14px;
}

.bridge-caption {
  caption-side: top;
  text-align: left;
  font-size: 13px;
  color: var(--text-invert-soft);
  padding-bottom: 10px;
}

.bridge-table th {
  text-align: left;
  font-size: 13px;
  color: var(--text-invert-soft);
  padding: 10px 12px;
  border-bottom: 1px solid var(--line-dark);
}

.bridge-table td {
  padding: 12px;
  border-bottom: 1px solid var(--line-dark);
  color: var(--text-invert-soft);
  vertical-align: top;
}

.bridge-note {
  font-size: 14px;
  color: var(--text-invert-soft);
}

/* ============ pages: collections ============ */

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

.collection-figure {
  margin: 0;
}

.collection-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.collection-reason {
  padding: 8px 16px 0;
  font-size: 14px;
  color: var(--text-soft);
}

.collection-relations {
  margin-top: 36px;
}

.collection-relations p {
  font-size: 14px;
  color: var(--text-invert-soft);
  margin-bottom: 12px;
  max-width: 760px;
}

.collection-channel-map {
  margin-top: 36px;
}

.map-list {
  border-top: 1px solid var(--line-dark);
}

.map-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 12px 4px;
  border-bottom: 1px solid var(--line-dark);
  font-size: 14px;
}

.map-name {
  color: var(--text-invert);
}

.map-link {
  color: var(--accent);
  border-bottom: 1px solid transparent;
}

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

.collections-entry {
  margin-top: 36px;
}

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

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

.entry-link {
  display: block;
  padding: 12px 16px;
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-invert);
  transition: border-color 0.18s ease, color 0.18s ease;
}

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

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

.updates-main .update-group {
  margin-bottom: 26px;
}

.update-figure {
  margin: 28px 0 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--bg-panel);
}

.update-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.figure-caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-invert-soft);
}

.updates-aside {
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  padding: 20px;
  align-self: start;
}

.aside-intro {
  font-size: 13px;
  color: var(--text-invert-soft);
  margin-bottom: 16px;
}

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

.aside-column {
  min-width: 0;
}

.aside-subtitle {
  font-size: 14px;
  color: var(--text-invert);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line-dark);
}

.aside-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

.aside-link {
  display: block;
  font-size: 13px;
  color: var(--text-invert-soft);
  transition: color 0.18s ease;
}

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

.updates-method {
  margin-top: 40px;
}

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

.method-block {
  min-width: 0;
  padding: 18px;
  background-color: var(--bg-panel);
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
}

.method-title {
  font-size: 16px;
  color: var(--text-invert);
  margin-bottom: 12px;
}

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

.method-item {
  font-size: 14px;
  color: var(--text-invert-soft);
}

.method-item .field-name {
  display: inline-block;
  margin-right: 8px;
}

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

.guide-figure {
  margin: 20px 0 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--bg-panel);
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-invert-soft);
}

.content-section {
  margin-bottom: 40px;
}

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

.scope-column {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
}

.subsection-title {
  font-size: 16px;
  margin-bottom: 12px;
  color: var(--text-invert);
}

.scope-covered .subsection-title {
  color: var(--accent);
}

.scope-excluded .subsection-title {
  color: var(--steel);
}

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

.scope-list li {
  font-size: 14px;
  color: var(--text-invert-soft);
  padding-left: 14px;
  position: relative;
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  background-color: var(--steel);
  border-radius: 50%;
}

.scope-covered .scope-list li::before {
  background-color: var(--accent);
}

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

.faq-item {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
}

.faq-question {
  cursor: pointer;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-invert);
  list-style: none;
  position: relative;
  padding-right: 44px;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 18px;
}

.faq-item[open] .faq-question::after {
  content: "–";
}

.faq-answer {
  padding: 0 18px 16px;
  font-size: 14px;
  color: var(--text-invert-soft);
  border-top: 1px solid var(--line-dark);
  padding-top: 14px;
}

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

.error-main {
  max-width: 960px;
  margin: 0 auto;
  padding: 64px 24px 0;
}

.error-panel {
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background-color: var(--bg-panel);
  padding: 40px 32px;
  text-align: center;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 44px;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 28px;
  color: var(--text-invert);
  margin-bottom: 14px;
}

.error-text {
  font-size: 15px;
  color: var(--text-invert-soft);
  max-width: 560px;
  margin: 0 auto 8px;
}

.error-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-top: 22px;
  padding: 0 24px;
  background-color: var(--accent);
  color: #1A1206;
  font-weight: 700;
  border-radius: var(--radius);
}

.error-action:hover {
  background-color: var(--accent-soft);
}

.error-routes {
  margin-top: 40px;
}

.error-route-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.error-route-item {
  min-width: 0;
}

.error-route-link {
  display: block;
  padding: 12px 16px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-invert);
  transition: border-color 0.18s ease, color 0.18s ease;
}

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

/* ============ components: motion enhancement ============ */

@media (prefers-reduced-motion: no-preference) {
  .collection-card,
  .choose-block,
  .method-block,
  .scope-column {
    transition: transform 0.18s ease, border-color 0.18s ease;
  }

  .collection-card:hover,
  .choose-block:hover,
  .method-block:hover,
  .scope-column:hover {
    transform: translateY(-2px);
  }
}

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

@media (max-width: 1080px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-media {
    max-width: 640px;
  }

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

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

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

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

  .updates-aside {
    order: 2;
  }

  .updates-main {
    order: 1;
  }
}

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

  .channel-index {
    position: static;
    order: 2;
  }

  .page-layout.sidebar-left .content-column {
    order: 1;
  }

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

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    min-height: 58px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 0 100%;
    margin-left: 0;
  }

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

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

  .nav-link {
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 1px solid var(--line-dark);
    border-left: 2px solid transparent;
  }

  .nav-link.is-current {
    border-bottom-color: var(--line-dark);
    border-left-color: var(--accent);
  }

  .top-bar-text {
    padding: 10px 16px;
  }

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

  .hero {
    padding: 32px 0 30px;
  }

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

  .hero-lead {
    font-size: 15px;
  }

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

  .channel-row-link {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 14px 4px;
  }

  .channel-feature,
  .channel-org {
    font-size: 13px;
  }

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

  .update-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

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

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

  .inner-main {
    padding: 18px 16px 0;
  }

  .page-header {
    padding: 16px 0 22px;
    margin-bottom: 26px;
  }

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

  .channel-catalog .channel-row {
    grid-template-columns: minmax(0, 1fr);
    padding: 16px;
  }

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

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

  .map-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

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

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

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

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

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

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

  .error-main {
    padding: 40px 16px 0;
  }

  .error-panel {
    padding: 32px 20px;
  }

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

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

  .footer-inner {
    padding: 32px 16px 24px;
  }

  .footer-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .field-table th,
  .field-table td,
  .bridge-table th,
  .bridge-table td {
    padding: 10px 8px;
  }
}

@media (max-width: 420px) {
  .hero-actions {
    gap: 10px;
  }

  .btn {
    flex: 1 1 100%;
  }

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

  .update-name {
    font-size: 14px;
  }
}