:root {
  --ink: #111111;
  --paper: #ffffff;
  --accent: #e8452c;
  --accent-soft: #fbe9e5;
  --band: #f4f4f1;
  --muted: #666662;
  --line: #deded8;
  --radius: 4px;
  --shell: 1180px;
  --font: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  font-variant-numeric: tabular-nums;
}

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

figure {
  margin: 0;
}

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

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

a:hover {
  text-decoration: underline;
}

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

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
}

h1 {
  font-size: 36px;
  line-height: 1.25;
  font-weight: 700;
}

h2 {
  font-size: 26px;
  line-height: 1.35;
  font-weight: 700;
}

h3 {
  font-size: 20px;
  line-height: 1.45;
  font-weight: 600;
}

p {
  margin: 0 0 12px;
}

p:last-child {
  margin-bottom: 0;
}

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

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

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

/* ---------- layout ---------- */

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

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 68px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--ink);
  text-decoration: none;
  flex-shrink: 0;
}

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

.brand-name {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-sub {
  font-size: 11px;
  line-height: 1.3;
  color: var(--muted);
  letter-spacing: 0;
}

.main-nav {
  flex: 1 1 auto;
  min-width: 0;
}

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

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-item > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 10px;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.nav-item > a:hover {
  color: var(--accent);
  text-decoration: none;
}

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

.nav-panel-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 11px;
  line-height: 1;
}

.nav-panel-toggle::before {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translate(-1px, -1px);
}

.nav-panel-toggle[aria-expanded="true"]::before {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.nav-panel {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  width: 460px;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(17, 17, 17, 0.08);
}

.nav-panel[hidden] {
  display: none;
}

.nav-panel-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.nav-panel-title {
  margin: 0 0 4px;
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  text-transform: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 6px;
}

.nav-panel-group a {
  display: flex;
  align-items: center;
  min-height: 38px;
  padding: 0 6px;
  font-size: 14px;
  color: var(--ink);
  border-left: 2px solid transparent;
}

.nav-panel-group a:hover {
  color: var(--accent);
  border-left-color: var(--accent);
  text-decoration: none;
}

.header-cta {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 16px;
  font-size: 14px;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 2px;
  background: var(--paper);
}

.header-cta:hover {
  background: var(--accent-soft);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--paper);
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
}

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

.home-main {
  padding-bottom: 0;
}

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

.site-footer {
  margin-top: 64px;
  background: var(--band);
  border-top: 4px solid var(--accent);
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 40px 24px 28px;
  display: grid;
  grid-template-columns: 1.4fr 1.6fr 1fr;
  gap: 40px;
}

.footer-brand-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.footer-slogan {
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 8px;
}

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

.footer-nav {
  display: flex;
  gap: 40px;
}

.footer-nav-group {
  min-width: 0;
}

.footer-nav-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}

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

.footer-nav-group a {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  font-size: 13px;
  color: var(--muted);
}

.footer-nav-group a:hover {
  color: var(--accent);
}

.footer-tips p:last-child {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.footer-bottom {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 14px 24px 20px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-copy {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
}

.back-top {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 12px;
  color: var(--muted);
}

.back-top:hover {
  color: var(--accent);
}

/* ---------- components ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 2px;
  border: 1px solid transparent;
  text-decoration: none;
}

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

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: #cf3a22;
  border-color: #cf3a22;
}

.btn-ghost {
  background: var(--paper);
  border-color: var(--line);
  color: var(--ink);
}

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

.btn-line {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}

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

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

.link-arrow::after {
  content: "\2192";
  font-size: 13px;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 22px;
}

.section-head h2 {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.section-head p {
  font-size: 14px;
  color: var(--muted);
  max-width: 72ch;
}

.section-desc {
  font-size: 14px;
  color: var(--muted);
  max-width: 72ch;
}

.section-intro {
  font-size: 14px;
  color: var(--muted);
  max-width: 72ch;
  margin-bottom: 18px;
}

.tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 2px;
  margin-bottom: 8px;
}

/* ---------- homepage ---------- */

.hero {
  padding: 40px 0 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 48px;
  align-items: start;
}

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

.hero-kicker {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 14px;
}

.hero-copy h1 {
  margin-bottom: 18px;
  max-width: 20ch;
}

.hero-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.hero-meta-item {
  padding: 14px 16px 0 0;
  min-width: 0;
}

.hero-meta-item dt {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.hero-meta-item dd {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

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

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

.channel-strip {
  margin-top: 32px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.channel-strip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.channel-strip-list li {
  flex: 1 1 0;
  min-width: 120px;
}

.channel-strip-list a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 2px solid transparent;
  text-align: center;
}

.channel-strip-list a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.featured-topic,
.channel-directory,
.watch-steps,
.entry-check,
.update-digest {
  padding: 56px 0 0;
}

.featured-layout {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 32px;
  align-items: start;
}

.featured-main {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper);
}

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

.featured-body {
  padding: 18px 20px 22px;
}

.featured-body h3 {
  margin-bottom: 8px;
}

.featured-body p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 12px;
}

.featured-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-width: 0;
}

.featured-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.featured-item:first-child {
  padding-top: 0;
}

.featured-item h3 {
  margin-bottom: 6px;
}

.featured-item p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

.directory-layout {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 32px;
  align-items: start;
}

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

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

.directory-table-wrap {
  min-width: 0;
  overflow-x: auto;
}

.directory-table {
  font-size: 14px;
}

.directory-table caption {
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  padding-bottom: 10px;
}

.directory-table th,
.directory-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.directory-table thead th {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  background: var(--band);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.directory-table tbody th {
  font-weight: 600;
  white-space: nowrap;
}

.directory-table tbody tr:hover {
  background: #fafaf8;
}

.steps-layout {
  display: grid;
  grid-template-columns: 8fr 4fr;
  gap: 40px;
  align-items: start;
}

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

.step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: step;
}

.step-item {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.step-item:last-child {
  border-bottom: 1px solid var(--line);
}

.step-num {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 50%;
}

.step-body {
  min-width: 0;
  flex: 1 1 auto;
}

.step-body h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

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

.steps-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.side-block {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--paper);
  min-width: 0;
}

.side-block h3 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

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

.check-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border: 1px solid var(--accent);
  border-radius: 2px;
}

.check-rows {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.check-row {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.check-index {
  flex-shrink: 0;
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--accent);
  width: 40px;
}

.check-content {
  min-width: 0;
  flex: 1 1 auto;
}

.check-content h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.check-content p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 8px;
}

.update-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--line);
}

.update-column {
  padding: 20px 24px 20px 0;
  min-width: 0;
}

.update-column + .update-column {
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

.update-column h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.update-column p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

.feedback-callout {
  margin-top: 56px;
  padding: 32px;
  background: var(--band);
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
}

.feedback-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.feedback-copy {
  min-width: 0;
  flex: 1 1 320px;
}

.feedback-copy h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

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

.feedback-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  flex-shrink: 0;
}

/* ---------- inner page shell ---------- */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  padding: 20px 0 0;
}

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

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

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

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

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
}

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

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

.breadcrumb-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 20px 24px 0;
}

.page-header {
  padding: 8px 0 0;
}

.page-title {
  font-size: 36px;
  line-height: 1.25;
  font-weight: 700;
  color: var(--ink);
  padding: 0;
  margin: 8px 0 0;
}

section.page-title,
div.page-title {
  padding: 14px 0 0;
  margin: 0;
  border-bottom: 1px solid var(--line);
  padding-bottom: 22px;
}

.page-title-inner {
  min-width: 0;
}

.page-kicker,
.page-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 10px;
}

.page-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 72ch;
  margin-bottom: 14px;
}

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

.page-tag,
.page-tags li {
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 2px;
  line-height: 1.5;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  gap: 40px;
  align-items: start;
  padding: 32px 0 0;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

.page-aside,
.content-aside {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-aside > section,
.page-aside > nav,
.content-aside > section {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--paper);
  min-width: 0;
}

.aside-title,
.page-aside h2,
.content-aside h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.page-aside p,
.content-aside p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.related-links {
  max-width: var(--shell);
  margin: 40px auto 0;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.related-links-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
}

.related-links-item {
  font-size: 14px;
  font-weight: 600;
}

/* ---------- channels page ---------- */

.page-channels .page-main > section,
.page-topics .content-main > section,
.page-entry-check .inner-main > section,
.page-changelog .inner-main > section,
.page-feedback .inner-main > section,
.page-viewing-guide .inner-main > section {
  padding: 32px 0 0;
}

.page-channels .page-main > section:first-child,
.page-topics .content-main > section:first-child,
.page-entry-check .inner-main > section:first-child,
.page-changelog .inner-main > section:first-child,
.page-feedback .inner-main > section:first-child,
.page-viewing-guide .inner-main > section:first-child {
  padding-top: 0;
}

.channel-overview-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: 32px;
  align-items: start;
}

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

.channel-column {
  min-width: 0;
  border-top: 2px solid var(--accent);
  padding-top: 12px;
}

.channel-column h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.channel-column p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

.channel-column-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.channel-column-list li {
  font-size: 13px;
  color: var(--muted);
  padding-left: 12px;
  position: relative;
}

.channel-column-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  background: var(--accent);
  border-radius: 50%;
}

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

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

.table-wrap {
  overflow-x: auto;
  min-width: 0;
}

.data-table {
  font-size: 14px;
  min-width: 520px;
}

.table-caption {
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  padding-bottom: 10px;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.data-table thead th {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  background: var(--band);
  white-space: nowrap;
}

.data-table tbody th {
  font-weight: 600;
  white-space: nowrap;
}

.table-note {
  font-size: 13px;
  color: var(--muted);
  margin-top: 12px;
}

.selection-steps {
  display: flex;
  flex-direction: column;
}

.selection-step {
  display: flex;
  gap: 16px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.selection-step:last-child {
  border-bottom: 1px solid var(--line);
}

.selection-num {
  flex-shrink: 0;
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  width: 32px;
  line-height: 1.3;
}

.selection-body {
  min-width: 0;
  flex: 1 1 auto;
}

.selection-body h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

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

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

.compare-channel,
.compare-topic {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.compare-channel h3,
.compare-topic h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.compare-channel p,
.compare-topic p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

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

.compare-list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  color: var(--muted);
}

.compare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  border: 1px solid var(--accent);
  border-radius: 50%;
}

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

.aside-anchor-list a {
  display: flex;
  align-items: center;
  min-height: 38px;
  font-size: 14px;
  color: var(--ink);
  border-left: 2px solid transparent;
  padding-left: 10px;
}

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

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

.aside-related-list li {
  min-width: 0;
}

.aside-related-list a {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  font-size: 14px;
  font-weight: 600;
}

.aside-related-list p {
  margin: 2px 0 0;
}

/* ---------- topics page ---------- */

.topic-curation {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
  gap: 32px;
  align-items: start;
}

.topic-curation h2 {
  grid-column: 1 / -1;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 4px;
}

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

.curation-copy p {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 12px;
}

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

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

.topic-list h2,
.curation-principles h2,
.topic-channel-relation h2,
.path-overview h2,
.step-tasks h2,
.common-blocks h2,
.scope-grid h2,
.check-table h2,
.result-judgement h2,
.exception-handling h2,
.update-note h2,
.log-group h2,
.history-note h2,
.before-feedback h2,
.faq-section h2,
.issue-types h2,
.handling-path h2 {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}

.topic-items {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.topic-item {
  display: flex;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.topic-thumb {
  flex-shrink: 0;
  width: 148px;
  min-width: 0;
}

.topic-thumb img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.topic-body {
  min-width: 0;
  flex: 1 1 auto;
}

.topic-body h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.topic-body p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 8px;
}

.topic-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
}

.topic-meta span {
  background: var(--band);
  padding: 2px 8px;
  border-radius: 2px;
}

.topic-desc {
  font-size: 14px;
  color: var(--muted);
}

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

.principle-item {
  min-width: 0;
  border-top: 2px solid var(--accent);
  padding-top: 12px;
}

.principle-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.principle-item p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

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

.relation-col {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.relation-col h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

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

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

.aside-link-list a {
  display: flex;
  align-items: center;
  min-height: 38px;
  font-size: 14px;
  color: var(--ink);
  border-left: 2px solid transparent;
  padding-left: 10px;
}

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

.aside-next-item {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.aside-next-item:first-of-type {
  border-top: 0;
  padding-top: 0;
}

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

.aside-next-item p {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

.aside-next-item a {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  font-size: 13px;
  font-weight: 600;
}

/* ---------- viewing guide page ---------- */

.path-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}

.path-step {
  flex: 1 1 0;
  min-width: 130px;
}

.path-step a {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 52px;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 2px solid transparent;
}

.path-step a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.path-num {
  flex-shrink: 0;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 50%;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.path-figure {
  min-width: 0;
  margin-bottom: 8px;
}

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

.step-task {
  padding: 22px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.step-task:last-child {
  border-bottom: 1px solid var(--line);
}

.step-index {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}

.step-task h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step-task > p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

.step-points {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.step-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--muted);
}

.step-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border: 1px solid var(--accent);
  border-radius: 50%;
}

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

.block-item {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
}

.block-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

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

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

.materials-list li {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
}

.materials-list strong {
  display: block;
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 2px;
}

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

.completion-list li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

.completion-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 13px;
  height: 13px;
  border: 1px solid var(--accent);
  border-radius: 2px;
}

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

.related-list a {
  display: flex;
  align-items: center;
  min-height: 38px;
  font-size: 14px;
  color: var(--ink);
  border-left: 2px solid transparent;
  padding-left: 10px;
}

.related-list a:hover {
  color: var(--accent);
  border-left-color: var(--accent);
  text-decoration: none;
}

/* ---------- entry check page ---------- */

.scope-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.scope-column {
  min-width: 0;
  border-top: 2px solid var(--accent);
  padding-top: 12px;
}

.scope-column h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.scope-column p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

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

.scope-column li {
  position: relative;
  padding-left: 14px;
  font-size: 13px;
  color: var(--muted);
}

.scope-column li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  background: var(--accent);
  border-radius: 50%;
}

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

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

.check-table table {
  min-width: 560px;
  font-size: 14px;
}

.check-table {
  overflow-x: auto;
}

.check-table caption {
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  padding-bottom: 10px;
}

.check-table th,
.check-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.check-table thead th {
  font-size: 12px;
  font-weight: 700;
  color: var(--muted);
  background: var(--band);
  white-space: nowrap;
}

.check-table tbody th {
  font-weight: 600;
  white-space: nowrap;
}

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

.result-block {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  border-top-width: 3px;
}

.result-ok {
  border-top-color: #2f7a4d;
}

.result-partial {
  border-top-color: #b8791f;
}

.result-bad {
  border-top-color: var(--accent);
}

.result-block h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.result-block p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 10px;
}

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

.exception-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.exception-index {
  grid-row: 1 / span 2;
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.3;
}

.exception-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.exception-item p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 6px;
}

.exception-item a {
  grid-column: 2;
  justify-self: start;
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  font-size: 13px;
  font-weight: 600;
}

.aside-intro {
  margin-bottom: 12px;
}

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

.quick-check-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
  font-size: 13px;
  line-height: 1.6;
}

.quick-check-label {
  flex-shrink: 0;
  color: var(--muted);
}

/* ---------- changelog page ---------- */

.update-note {
  min-width: 0;
}

.update-note p {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 12px;
  max-width: 72ch;
}

.update-figure {
  min-width: 0;
  margin-top: 8px;
}

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

.section-note {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 14px;
}

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

.log-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.log-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 6px;
}

.log-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 2px;
  line-height: 1.6;
}

.log-tag-add {
  color: #2f7a4d;
  background: #e9f3ed;
}

.log-tag-adjust {
  color: #b8791f;
  background: #fbf1e3;
}

.log-tag-fix {
  color: var(--accent);
  background: var(--accent-soft);
}

.log-meta time {
  font-size: 12px;
  color: var(--muted);
}

.log-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

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

.history-note {
  min-width: 0;
}

.history-tips {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-tips li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
}

.history-tips li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border: 1px solid var(--accent);
  border-radius: 50%;
}

.history-tips strong {
  color: var(--ink);
}

.legend-item {
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.legend-item:first-of-type {
  border-top: 0;
  padding-top: 0;
}

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

.legend-item p {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- feedback page ---------- */

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

.before-item {
  min-width: 0;
  border-top: 2px solid var(--accent);
  padding-top: 12px;
}

.before-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.before-item p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 8px;
}

.before-link a,
.issue-link a,
.path-link a,
.aside-check-link a {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  font-size: 13px;
  font-weight: 600;
}

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

.faq-item {
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 12px 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  flex-shrink: 0;
  font-size: 20px;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
}

.faq-item[open] .faq-question::after {
  content: "\2212";
}

.faq-item[open] .faq-question {
  color: var(--accent);
}

.faq-answer {
  padding: 0 0 16px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 8px;
  max-width: 72ch;
}

.issue-media {
  min-width: 0;
  margin-bottom: 20px;
}

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

.issue-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

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

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

.issue-item p {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
}

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

.path-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.path-item .path-num {
  grid-row: 1 / span 2;
  width: 32px;
  height: 32px;
  font-size: 13px;
}

.path-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.path-item p {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 6px;
}

.path-item .path-link {
  grid-column: 2;
  justify-self: start;
  margin: 0;
}

.aside-check-item {
  padding: 12px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.aside-check-item:first-of-type {
  border-top: 0;
  padding-top: 0;
}

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

.aside-check-item p {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

.aside-check-link {
  margin: 0;
}

/* ---------- 404 page ---------- */

.error-main {
  padding-top: 64px;
  padding-bottom: 64px;
}

.error-inner {
  max-width: 620px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 16px;
}

.error-lead {
  font-size: 16px;
  color: var(--muted);
  margin: 14px 0 24px;
}

.error-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.error-hints {
  text-align: left;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.error-hints h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.error-hints ul {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.error-hints a {
  display: flex;
  align-items: center;
  min-height: 40px;
  font-size: 14px;
  color: var(--ink);
  border-left: 2px solid transparent;
  padding-left: 10px;
}

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

/* ---------- responsive ---------- */

@media (max-width: 1024px) {
  .header-inner {
    gap: 16px;
  }

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

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 8px 24px 16px;
    box-shadow: 0 8px 16px rgba(17, 17, 17, 0.06);
  }

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

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

  .nav-item {
    flex-wrap: wrap;
    border-bottom: 1px solid var(--line);
  }

  .nav-item > a {
    flex: 1 1 auto;
    min-height: 48px;
    padding: 0 4px;
    font-size: 15px;
    border-bottom: 0;
  }

  .nav-item.is-current > a {
    border-bottom: 0;
  }

  .nav-panel-toggle {
    width: 44px;
    height: 48px;
  }

  .nav-panel {
    position: static;
    width: 100%;
    grid-template-columns: 1fr;
    gap: 16px;
    box-shadow: none;
    border: 0;
    border-top: 1px solid var(--line);
    border-radius: 0;
    padding: 12px 0 16px;
  }

  .nav-panel-group a {
    min-height: 44px;
  }

  .header-cta {
    margin-left: auto;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero-copy h1 {
    max-width: none;
  }

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

  .featured-layout,
  .directory-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .steps-layout {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .channel-overview-body {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .topic-curation {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .update-columns {
    grid-template-columns: 1fr;
  }

  .update-column {
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
  }

  .update-column + .update-column {
    padding-left: 0;
    border-left: 0;
  }

  .update-column:last-child {
    border-bottom: 0;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

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

@media (max-width: 720px) {
  body {
    font-size: 15.5px;
    line-height: 1.8;
  }

  h1,
  .page-title {
    font-size: 28px;
    line-height: 1.3;
  }

  h2 {
    font-size: 22px;
    line-height: 1.4;
  }

  h3 {
    font-size: 18px;
    line-height: 1.5;
  }

  .header-inner {
    padding: 0 16px;
    min-height: 60px;
    gap: 10px;
  }

  .brand-sub {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .main-nav {
    padding: 8px 16px 16px;
  }

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

  .breadcrumb {
    padding-top: 14px;
  }

  .breadcrumb-inner {
    padding: 14px 16px 0;
  }

  .page-layout {
    padding-left: 16px;
    padding-right: 16px;
    padding-top: 24px;
    gap: 28px;
  }

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

  section.page-title,
  div.page-title {
    padding-bottom: 18px;
  }

  .hero {
    padding-top: 28px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
  }

  .hero-meta {
    grid-template-columns: 1fr;
  }

  .hero-meta-item {
    padding: 12px 0 0;
    border-top: 1px solid var(--line);
  }

  .hero-meta-item:first-child {
    border-top: 0;
    padding-top: 0;
  }

  .channel-strip-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .channel-strip-list li {
    flex: 0 0 auto;
    min-width: 0;
  }

  .channel-strip-list a {
    min-height: 48px;
    padding: 0 14px;
    white-space: nowrap;
  }

  .featured-topic,
  .channel-directory,
  .watch-steps,
  .entry-check,
  .update-digest {
    padding-top: 40px;
  }

  .featured-body {
    padding: 16px;
  }

  .channel-columns,
  .principle-columns,
  .scope-columns,
  .result-blocks,
  .before-grid,
  .block-list {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .compare-columns,
  .relation-columns {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .topic-item {
    flex-direction: column;
    gap: 12px;
  }

  .topic-thumb {
    width: 100%;
  }

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

  .check-row {
    gap: 14px;
  }

  .check-index {
    width: 32px;
    font-size: 18px;
  }

  .feedback-callout {
    padding: 22px 18px;
    margin-top: 40px;
  }

  .feedback-actions {
    width: 100%;
  }

  .feedback-actions .btn {
    flex: 1 1 auto;
  }

  .issue-grid {
    grid-template-columns: 1fr;
  }

  .path-strip {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .path-step {
    flex: 0 0 auto;
  }

  .path-step a {
    min-height: 48px;
    white-space: nowrap;
  }

  .exception-item,
  .path-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 4px 12px;
  }

  .related-links {
    padding: 16px;
    margin-top: 32px;
    gap: 12px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 32px 16px 24px;
  }

  .footer-tips {
    grid-column: auto;
  }

  .footer-nav {
    gap: 28px;
  }

  .footer-bottom {
    padding: 14px 16px 20px;
  }

  .error-main {
    padding-top: 40px;
    padding-bottom: 40px;
  }

  .error-inner {
    padding: 0 16px;
  }

  .error-code {
    font-size: 52px;
  }

  .error-actions .btn {
    flex: 1 1 auto;
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 14px;
  }

  .site-main {
    padding: 0 14px;
  }

  .page-layout {
    padding-left: 14px;
    padding-right: 14px;
  }

  .breadcrumb-inner {
    padding-left: 14px;
    padding-right: 14px;
  }

  .hero-meta-item dd {
    font-size: 13px;
  }

  .footer-inner {
    padding-left: 14px;
    padding-right: 14px;
  }

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

  .table-wrap,
  .directory-table-wrap,
  .check-table {
    overflow-x: auto;
  }

  .data-table,
  .directory-table,
  .check-table table {
    min-width: 480px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 程序验收反馈：移动端防溢出 */
@media (max-width: 768px) {
  .site-main,
  .site-main * {
    min-width: 0;
    max-width: 100%;
  }

  .site-main :is(h1, h2, h3, h4, p, a, span) {
    overflow-wrap: anywhere;
  }
}