/* =========================================================
   樱桃视频APP · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================= */

/* ---------- base ---------- */
:root {
  --paper: #f5f3ee;
  --sand: #eae5da;
  --ink: #1b1917;
  --ink-soft: #6c665d;
  --cherry: #8a2b3a;
  --line: #d6d0c3;
  --night: #211d1a;
  --serif: "Noto Serif SC", "Songti SC", Georgia, serif;
  --sans: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --wrap: 1200px;
  --read: 820px;
  --gap: 40px;
}

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

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

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

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.25;
  letter-spacing: 0.01em;
}

p {
  margin: 0 0 1em;
}

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

dl,
dd {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.18s ease;
}

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

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

figure {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

strong {
  font-weight: 600;
}

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

/* ---------- layout ---------- */
.site-header {
  position: relative;
  z-index: 40;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-wordmark {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

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

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: stretch;
  gap: 0;
}

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

.nav-item + .nav-item {
  border-left: 1px solid var(--line);
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  font-size: 15px;
  color: var(--ink-soft);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--cherry);
  text-decoration: none;
}

.nav-item.is-current a {
  color: var(--cherry);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  position: relative;
}

.nav-toggle::before,
.nav-toggle::after,
.nav-toggle span {
  content: "";
}

.nav-toggle::before,
.nav-toggle::after {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 1.5px;
  background: var(--ink);
}

.nav-toggle::before {
  top: 15px;
}

.nav-toggle::after {
  bottom: 15px;
}

.mobile-drawer {
  display: none;
}

.site-main {
  display: block;
}

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

.inner-main {
  padding-top: 28px;
  padding-bottom: 72px;
}

.site-footer {
  background: var(--night);
  color: #e8e2d6;
  margin-top: 0;
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 56px 24px 40px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--gap);
}

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

.footer-brand {
  font-family: var(--serif);
  font-size: 18px;
  color: #f5f3ee;
  margin-bottom: 12px;
  letter-spacing: 0.04em;
}

.footer-intro {
  font-size: 14px;
  line-height: 1.8;
  color: #b6ad9d;
  margin: 0;
}

.footer-title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: #b6ad9d;
  margin: 0 0 14px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 22px;
}

.footer-links a {
  font-size: 14px;
  color: #e8e2d6;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: #f0b9c0;
}

.footer-note {
  font-size: 13px;
  line-height: 1.7;
  color: #b6ad9d;
  margin: 0;
}

.footer-bottom {
  border-top: 1px solid #3a332d;
}

.footer-bottom {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 20px 24px 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.footer-wordmark {
  font-family: var(--serif);
  font-size: 15px;
  color: #f5f3ee;
  margin: 0;
  letter-spacing: 0.04em;
}

.footer-claim {
  font-size: 13px;
  color: #b6ad9d;
  margin: 0;
}

/* ---------- components ---------- */
.section {
  padding: 64px 0;
  border-top: 1px solid var(--line);
}

.section:first-of-type {
  border-top: 0;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
  align-items: end;
  gap: 16px 40px;
  margin-bottom: 36px;
}

.section-head h2 {
  font-size: 26px;
  grid-column: 1;
}

.section-head .section-note {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: end;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.section-index {
  grid-column: 1;
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.section-note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.section-tail {
  margin: 28px 0 0;
  font-size: 14px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--cherry);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.text-link::after {
  content: "→";
  font-size: 13px;
}

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

.section-title {
  font-size: 24px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.section-title .section-num {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--cherry);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 20px;
}

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

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

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

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

.page-header {
  margin-bottom: 24px;
}

.page-title {
  font-size: 36px;
  color: var(--ink);
  margin: 0;
}

.page-heading,
.page-head {
  margin-bottom: 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.page-heading .section-index,
.page-head .section-index,
.page-head .page-kicker,
.page-hero .section-index,
.page-hero .section-number {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.page-lead,
.page-lede {
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 46em;
  margin: 0 0 12px;
}

.page-meta {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin: 0;
}

.page-hero {
  padding: 8px 0 36px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) minmax(0, 320px);
  gap: var(--gap);
  align-items: start;
}

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

.side-column,
.page-aside {
  min-width: 0;
  position: sticky;
  top: 24px;
  font-size: 14px;
}

.side-block,
.aside-block {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.side-block:first-child,
.aside-block:first-child {
  border-top: 0;
  padding-top: 0;
}

.side-title,
.aside-title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.side-list,
.aside-link-list,
.side-terms {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.side-list a,
.aside-link-list a,
.side-terms a,
.side-more a {
  font-size: 14px;
  color: var(--ink);
  line-height: 1.6;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.side-list a:hover,
.aside-link-list a:hover,
.side-terms a:hover,
.side-more a:hover {
  color: var(--cherry);
}

.side-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
}

.aside-count {
  font-size: 12px;
  color: var(--ink-soft);
  white-space: nowrap;
}

.aside-note-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* table base */
.map-table,
.compare-table,
.data-table {
  font-size: 14px;
  margin: 0 0 8px;
}

.map-table th,
.map-table td,
.compare-table th,
.compare-table td,
.data-table th,
.data-table td {
  text-align: left;
  vertical-align: top;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  line-height: 1.7;
}

.map-table thead th,
.compare-table thead th,
.data-table thead th {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  background: var(--sand);
  border-bottom: 1px solid var(--line);
}

.map-table tbody th,
.compare-table tbody th,
.data-table tbody th {
  font-weight: 600;
  color: var(--ink);
}

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

/* steps shared */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

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

.step-item:first-child {
  border-top: 0;
}

/* related nav */
.related-nav {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.related-title {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.related-list,
.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: 14px;
}

.related-list a,
.related-links a {
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.related-list a:hover,
.related-links a:hover {
  color: var(--cherry);
  text-decoration: none;
  border-bottom-color: var(--cherry);
}

/* faq shared (details) */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

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

.faq-question {
  cursor: pointer;
  padding: 18px 32px 18px 0;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  position: relative;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--cherry);
}

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

.faq-answer {
  margin: 0;
  padding: 0 32px 20px 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- pages ---------- */

/* ---- index ---- */
.hero {
  margin: 0 -24px;
}

.hero-figure {
  position: relative;
  overflow: hidden;
  background: var(--night);
}

.hero-image {
  width: 100%;
  height: 520px;
  object-fit: cover;
  display: block;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 56px 48px;
  background: linear-gradient(180deg, rgba(27, 25, 23, 0.15) 0%, rgba(27, 25, 23, 0.72) 100%);
  color: var(--paper);
}

.hero-kicker {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: #e8d9d5;
  margin: 0 0 14px;
}

.hero-overlay h1 {
  font-size: 44px;
  color: #f5f3ee;
  max-width: 22em;
  margin: 0 0 18px;
}

.hero-quote {
  font-size: 16px;
  line-height: 1.75;
  color: #e8e2d6;
  max-width: 36em;
  margin: 0 0 26px;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 15px;
  border-radius: 4px;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn:hover,
.btn:focus-visible {
  text-decoration: none;
}

.btn-primary {
  background: var(--cherry);
  color: #f5f3ee;
  border-color: var(--cherry);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #6f2230;
  border-color: #6f2230;
  color: #f5f3ee;
}

.btn-ghost {
  background: transparent;
  color: #f5f3ee;
  border-color: rgba(245, 243, 238, 0.6);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(245, 243, 238, 0.12);
  border-color: #f5f3ee;
  color: #f5f3ee;
}

.channel-tagline {
  background: var(--sand);
  border-bottom: 1px solid var(--line);
  padding: 0 24px;
}

.tagline-list {
  max-width: var(--wrap);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.tagline-list li {
  flex: 1 1 auto;
  border-right: 1px solid var(--line);
}

.tagline-list li:last-child {
  border-right: 0;
}

.tagline-list a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 12px;
  font-size: 14px;
  color: var(--ink);
  white-space: nowrap;
}

.tagline-list a:hover {
  color: var(--cherry);
  text-decoration: none;
}

.focus-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.focus-item {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 32px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  align-items: start;
}

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

.focus-media {
  overflow: hidden;
  border-radius: 4px;
  background: var(--sand);
}

.focus-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

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

.focus-number {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cherry);
  margin: 0 0 8px;
}

.focus-title {
  font-size: 22px;
  margin: 0 0 12px;
}

.focus-comment {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 8px;
  max-width: 42em;
}

.focus-body .text-link {
  margin-top: 6px;
}

.directory-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 48px;
}

.directory-item {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 2px 12px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.directory-item:nth-child(1),
.directory-item:nth-child(2) {
  border-top: 0;
  padding-top: 0;
}

.directory-number {
  grid-row: 1 / span 2;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  padding-top: 4px;
}

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

.directory-name a:hover {
  color: var(--cherry);
}

.directory-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
}

.path-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.path-item {
  min-width: 0;
  padding: 24px;
  background: var(--sand);
  border-radius: 4px;
}

.path-name {
  font-size: 18px;
  margin: 0 0 14px;
}

.path-steps {
  list-style: decimal;
  padding-left: 20px;
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink);
}

.path-steps li {
  padding-left: 4px;
}

.path-steps a {
  color: var(--ink);
}

.path-steps a:hover {
  color: var(--cherry);
}

.path-scene {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.feature-strip-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.feature-strip {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr) 200px 100px;
  align-items: center;
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.feature-strip:first-child {
  border-top: 0;
  padding-top: 0;
}

.feature-number {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cherry);
  margin: 0;
}

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

.feature-name a:hover {
  color: var(--cherry);
}

.feature-note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
}

.feature-count {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0;
  text-align: right;
}

.steps-media {
  margin-bottom: 28px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--sand);
}

.steps-media img {
  width: 100%;
  height: auto;
  max-height: 360px;
  object-fit: cover;
  display: block;
}

.steps-caption {
  font-size: 13px;
  color: var(--ink-soft);
  padding: 10px 14px;
  background: var(--sand);
}

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

.steps-section .step-item {
  border-top: 2px solid var(--ink);
  padding: 18px 0 0;
  min-width: 0;
}

.step-number {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cherry);
  margin: 0 0 10px;
}

.step-title {
  font-size: 18px;
  margin: 0 0 10px;
}

.step-result {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.glossary-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.glossary-row {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 24px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.glossary-row:first-child {
  border-top: 0;
}

.glossary-term {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.glossary-def {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.boundary-item {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.boundary-item:first-child {
  border-top: 0;
}

.boundary-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
  max-width: 60em;
}

.update-brief-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.update-brief {
  display: grid;
  grid-template-columns: 100px minmax(0, 1fr);
  gap: 24px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.update-brief:first-child {
  border-top: 0;
}

.update-version {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cherry);
  margin: 0;
}

.update-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

/* ---- channels ---- */
.filter-bar {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.filter-help {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.filter-tag {
  min-height: 40px;
  padding: 0 16px;
  font-size: 14px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.filter-tag:hover,
.filter-tag:focus-visible {
  border-color: var(--cherry);
  color: var(--cherry);
}

.filter-tag.is-active {
  background: var(--cherry);
  border-color: var(--cherry);
  color: #f5f3ee;
}

.filter-count {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0;
}

.channel-list {
  margin-bottom: 48px;
}

.channel-figure {
  margin-bottom: 28px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--sand);
}

.channel-figure img {
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  display: block;
}

.channel-figure figcaption {
  font-size: 13px;
  color: var(--ink-soft);
  padding: 10px 14px;
  background: var(--sand);
}

.channel-item {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

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

.channel-head {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.channel-num {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cherry);
  margin: 0;
}

.channel-name {
  font-size: 21px;
  margin: 0;
}

.channel-count {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0;
  white-space: nowrap;
}

.channel-scope {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 14px;
  max-width: 46em;
}

.entry-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 56px;
}

.entry-item {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink);
  padding-left: 14px;
  position: relative;
}

.entry-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--cherry);
}

.channel-map {
  margin-bottom: 40px;
}

.channel-map .map-table {
  margin-top: 16px;
}

.channel-rules .rule-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.rule-item {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.rule-item:first-child {
  border-top: 0;
}

.rule-title {
  font-size: 17px;
  margin: 0 0 8px;
}

.rule-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.section-foot {
  margin-top: 24px;
  font-size: 14px;
}

/* ---- features ---- */
.page-layout.sidebar-left,
.sidebar-left .page-layout {
  grid-template-columns: minmax(0, 320px) minmax(0, 760px);
}

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

.sidebar-left .page-content {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}

.page-content .breadcrumb {
  margin-bottom: 20px;
}

.topic-section {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.topic-section:last-of-type {
  border-bottom: 0;
}

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

.topic-cover {
  margin-bottom: 24px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--sand);
}

.topic-cover img {
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
  display: block;
}

.topic-caption {
  font-size: 13px;
  color: var(--ink-soft);
  padding: 10px 14px;
  background: var(--sand);
}

.topic-header {
  margin-bottom: 20px;
}

.topic-title {
  font-size: 24px;
  margin: 6px 0 12px;
}

.topic-lede {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 10px;
  max-width: 42em;
}

.topic-meta {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin: 0;
}

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

.playlist-item {
  counter-increment: playlist;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.playlist-item::before {
  content: counter(playlist, decimal-leading-zero);
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.playlist-text {
  min-width: 0;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.playlist-name {
  font-weight: 600;
  font-family: var(--serif);
  display: block;
  margin-bottom: 2px;
}

.playlist-desc {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0;
}

.playlist-actions {
  display: flex;
  gap: 6px;
}

.move-btn {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  font-size: 14px;
  color: var(--ink);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.move-btn:hover:not(:disabled),
.move-btn:focus-visible:not(:disabled) {
  border-color: var(--cherry);
  color: var(--cherry);
}

.move-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.section-block {
  margin-bottom: 48px;
}

.section-block .step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.section-block .step-item {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 24px;
  align-items: baseline;
}

.step-name {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cherry);
  margin: 0;
}

.step-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

/* ---- guide ---- */
.page-guide .text-column {
  max-width: var(--read);
}

.text-column {
  max-width: var(--read);
}

.guide-steps,
.guide-levels,
.guide-verify,
.guide-troubleshoot,
.guide-faq {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.guide-faq {
  border-bottom: 0;
}

.guide-figure {
  margin-bottom: 28px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--sand);
}

.guide-figure img {
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
  display: block;
}

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

.guide-steps .step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.guide-steps .step-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
}

.step-head {
  margin: 0;
}

.step-num {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cherry);
}

.step-body {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
}

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

.level-card {
  min-width: 0;
  padding: 22px;
  background: var(--sand);
  border-radius: 4px;
}

.level-title {
  font-size: 18px;
  margin: 0 0 6px;
}

.level-audience {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.level-list {
  list-style: disc;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  margin-bottom: 12px;
}

.level-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.check-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.check-item {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.check-item:first-child {
  border-top: 0;
}

.check-title {
  font-size: 17px;
  margin: 0 0 6px;
}

.check-body {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.trouble-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.trouble-item {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 24px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.trouble-item:first-child {
  border-top: 0;
}

.trouble-head {
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0;
}

.trouble-body {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

/* ---- terms ---- */
.text-wrap {
  max-width: var(--read);
}

.term-index-bar {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}

.section-heading {
  font-size: 22px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.heading-num {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--cherry);
}

.index-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.index-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 16px;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink);
}

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

.index-count {
  font-size: 12px;
  color: var(--ink-soft);
}

.term-group {
  margin-bottom: 44px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.term-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 16px;
}

.term-item {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 24px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.term-item:first-child {
  border-top: 0;
}

.term-name {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.term-def {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.term-def a {
  color: var(--cherry);
}

.term-compare {
  margin-bottom: 44px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.term-figure {
  margin: 20px 0 24px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--sand);
}

.term-figure img {
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  display: block;
}

.term-figure figcaption {
  font-size: 13px;
  color: var(--ink-soft);
  padding: 10px 14px;
  background: var(--sand);
}

.term-conventions {
  margin-bottom: 44px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.convention-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 16px;
}

.convention-item {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.convention-item:first-child {
  border-top: 0;
}

.convention-item h3 {
  font-size: 17px;
  margin: 0 0 6px;
}

.convention-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.related-reading {
  padding-top: 8px;
}

/* ---- pitfalls ---- */
.pitfalls-list {
  margin-bottom: 56px;
}

.pitfall-item {
  border-top: 1px solid var(--line);
}

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

.pitfall-heading {
  margin: 0;
}

.pitfall-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding: 16px 32px 16px 0;
  text-align: left;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  position: relative;
}

.pitfall-toggle::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--cherry);
}

.pitfall-toggle[aria-expanded="true"]::after {
  content: "−";
}

.pitfall-toggle:hover {
  color: var(--cherry);
}

.pitfall-panel {
  padding: 0 0 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

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

.pitfall-misread,
.pitfall-fact,
.pitfall-judge {
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--line);
}

.pitfall-misread {
  color: var(--ink-soft);
}

.pitfall-fact {
  color: var(--ink);
  border-left-color: var(--cherry);
}

.pitfall-judge {
  color: var(--ink-soft);
}

.identify-points {
  margin-bottom: 56px;
}

.identify-figure {
  margin-bottom: 28px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--sand);
}

.identify-figure img {
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
  display: block;
}

.identify-figure figcaption {
  font-size: 13px;
  color: var(--ink-soft);
  padding: 10px 14px;
  background: var(--sand);
}

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

.identify-item {
  min-width: 0;
  padding: 20px;
  background: var(--sand);
  border-radius: 4px;
}

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

.identify-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 8px;
}

.identify-item p:last-child {
  margin-bottom: 0;
}

.feedback-path {
  margin-bottom: 24px;
}

.feedback-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.feedback-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.feedback-step:first-child {
  border-top: 0;
}

.feedback-step .step-number {
  margin: 0;
}

.feedback-step h3 {
  font-size: 17px;
  margin: 0 0 6px;
}

.feedback-step p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.feedback-step > p:last-child {
  grid-column: 2;
}

/* ---- updates ---- */
.version-log {
  margin-bottom: 56px;
}

.version-figure {
  margin-bottom: 28px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--sand);
}

.version-figure img {
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  display: block;
}

.version-figure figcaption {
  font-size: 13px;
  color: var(--ink-soft);
  padding: 10px 14px;
  background: var(--sand);
}

.version-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: 24px;
  border-left: 1px solid var(--line);
  margin-left: 8px;
}

.version-item {
  position: relative;
  padding: 0 0 32px;
}

.version-item:last-child {
  padding-bottom: 0;
}

.version-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cherry);
  border: 2px solid var(--paper);
}

.version-card {
  min-width: 0;
}

.version-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 12px;
}

.version-no {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cherry);
  margin: 0;
  white-space: nowrap;
}

.version-title {
  font-size: 19px;
  margin: 0;
}

.version-changes {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.version-changes li {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  padding-left: 16px;
  position: relative;
}

.version-changes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--line);
}

.adjust-table {
  margin-bottom: 56px;
}

.change-loc a {
  color: var(--cherry);
}

.feedback {
  margin-bottom: 24px;
}

.feedback-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-bottom: 28px;
}

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

.sub-title {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

.feedback-list li {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.feedback-list strong {
  display: block;
  color: var(--ink);
  margin-bottom: 2px;
}

.feedback-note {
  padding: 22px;
  background: var(--sand);
  border-radius: 4px;
}

.feedback-note p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 12px;
}

.feedback-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
}

.feedback-links a {
  font-size: 14px;
  color: var(--cherry);
}

.process-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 16px;
}

.process-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.process-step:first-child {
  border-top: 0;
}

.process-step .step-number {
  margin: 0;
}

.process-step p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

/* ---- 404 ---- */
.error-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 72px 24px 96px;
}

.error-inner {
  max-width: 640px;
}

.error-code {
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cherry);
  margin: 0 0 12px;
}

.error-title {
  font-size: 36px;
  margin: 0 0 16px;
}

.error-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 32px;
}

.error-block {
  padding: 24px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}

.error-subtitle {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

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

.error-list a {
  font-size: 15px;
  color: var(--ink);
}

.error-list a:hover {
  color: var(--cherry);
}

.error-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0 0 24px;
}

.error-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  background: var(--cherry);
  color: #f5f3ee;
  border-radius: 4px;
  font-size: 15px;
}

.error-action:hover,
.error-action:focus-visible {
  background: #6f2230;
  color: #f5f3ee;
  text-decoration: none;
}

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  :root {
    --gap: 32px;
  }

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

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

  .hero-image {
    height: 440px;
  }

  .hero-overlay {
    padding: 40px 32px;
  }

  .hero-overlay h1 {
    font-size: 36px;
  }

  .focus-item {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 24px;
  }

  .feature-strip {
    grid-template-columns: 48px minmax(0, 1fr) 160px 80px;
    gap: 16px;
  }

  .footer-inner {
    grid-template-columns: 1.2fr 1fr 1fr 1.2fr;
    gap: 28px;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
    line-height: 1.7;
  }

  .header-inner {
    height: 60px;
    padding: 0 16px;
    gap: 12px;
  }

  .brand-wordmark {
    font-size: 18px;
  }

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

  .site-nav {
    display: block;
    position: static;
  }

  .nav-list {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 60px;
    flex-direction: column;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 8px 16px 16px;
    z-index: 50;
  }

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

  .nav-item {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .nav-item:first-child {
    border-top: 0;
  }

  .nav-list a {
    min-height: 48px;
    padding: 0 4px;
    font-size: 16px;
    width: 100%;
  }

  .mobile-drawer {
    display: block;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 8px 16px 16px;
  }

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

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

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

  .drawer-list li:first-child {
    border-top: 0;
  }

  .drawer-list a {
    display: flex;
    align-items: center;
    min-height: 48px;
    font-size: 16px;
    color: var(--ink);
  }

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

  .inner-main {
    padding-top: 20px;
    padding-bottom: 56px;
  }

  .hero {
    margin: 0 -16px;
  }

  .hero-image {
    height: 400px;
  }

  .hero-overlay {
    padding: 28px 20px;
  }

  .hero-overlay h1 {
    font-size: 28px;
    margin-bottom: 14px;
  }

  .hero-kicker {
    margin-bottom: 10px;
  }

  .hero-quote {
    font-size: 15px;
    margin-bottom: 20px;
  }

  .channel-tagline {
    padding: 0 16px;
  }

  .tagline-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .tagline-list::-webkit-scrollbar {
    display: none;
  }

  .tagline-list li {
    flex: 0 0 auto;
    border-right: 1px solid var(--line);
  }

  .tagline-list a {
    min-height: 44px;
    padding: 0 14px;
  }

  .section {
    padding: 44px 0;
  }

  .section-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    margin-bottom: 24px;
  }

  .section-head h2 {
    grid-column: 1;
    font-size: 22px;
  }

  .section-head .section-note {
    grid-column: 1;
    grid-row: auto;
  }

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

  .page-heading,
  .page-head {
    margin-bottom: 28px;
    padding-bottom: 20px;
  }

  .page-lead,
  .page-lede {
    font-size: 16px;
  }

  .focus-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 24px 0;
  }

  .focus-media img {
    height: 200px;
  }

  .focus-title {
    font-size: 19px;
  }

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

  .directory-item:nth-child(2) {
    border-top: 1px solid var(--line);
    padding-top: 18px;
  }

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

  .feature-strip {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 6px 12px;
    padding: 18px 0;
  }

  .feature-number {
    grid-row: 1 / span 3;
    padding-top: 4px;
  }

  .feature-name {
    grid-column: 2;
  }

  .feature-note {
    grid-column: 2;
  }

  .feature-count {
    grid-column: 2;
    text-align: left;
  }

  .steps-section .step-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .steps-section .step-item {
    padding: 18px 0;
  }

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

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

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

  .sidebar-left .page-aside,
  .sidebar-left .page-content {
    grid-column: 1;
    grid-row: auto;
  }

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

  .sidebar-left .page-aside {
    order: 2;
  }

  .side-column,
  .page-aside {
    position: static;
    padding-top: 24px;
    border-top: 1px solid var(--line);
  }

  .filter-tags {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .filter-tags::-webkit-scrollbar {
    display: none;
  }

  .filter-tag {
    flex: 0 0 auto;
  }

  .channel-head {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 4px 10px;
  }

  .channel-count {
    grid-column: 2;
  }

  .entry-list {
    padding-left: 0;
  }

  .map-table,
  .compare-table,
  .data-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .map-table thead,
  .map-table tbody,
  .compare-table thead,
  .compare-table tbody,
  .data-table thead,
  .data-table tbody {
    display: table;
    width: 100%;
  }

  .topic-title {
    font-size: 21px;
  }

  .playlist-item {
    grid-template-columns: 28px minmax(0, 1fr) auto;
    gap: 10px;
  }

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

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

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

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

  .index-links {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }

  .index-links::-webkit-scrollbar {
    display: none;
  }

  .index-links a {
    flex: 0 0 auto;
  }

  .identify-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .feedback-step {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 10px;
  }

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

  .version-head {
    flex-wrap: wrap;
    gap: 4px 12px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 24px;
    padding: 40px 16px 32px;
  }

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

  .footer-bottom {
    padding: 18px 16px 28px;
  }
}

@media (max-width: 520px) {
  .hero-image {
    height: 360px;
  }

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

  .hero-actions {
    gap: 10px;
  }

  .btn {
    padding: 0 18px;
    font-size: 14px;
  }

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

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

  .error-main {
    padding: 48px 16px 72px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}