/* ==========================================================================
   天美影院入口 · 全站样式
   base → layout → components → pages → responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base
   -------------------------------------------------------------------------- */

:root {
  --canvas: #f4f1ea;
  --ink: #17352f;
  --ink-soft: #2c4a43;
  --accent: #c4553b;
  --accent-dark: #a4412a;
  --sand: #d9b26f;
  --muted: #6b746e;
  --surface: #ffffff;
  --line: #dcd5c8;
  --line-soft: #e8e2d6;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-card: 0 1px 0 rgba(23, 53, 47, 0.06), 0 6px 18px -12px rgba(23, 53, 47, 0.35);
  --font-serif: "Songti SC", "Noto Serif SC", "SimSun", serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --shell: 1120px;
  --read: 720px;
  --aside: 300px;
  --gap: 32px;
}

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

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

body.site-body {
  margin: 0;
  background-color: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  margin: 0 0 0.5em;
}

h1 {
  font-size: 36px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

h4 {
  font-size: 16px;
}

p {
  margin: 0 0 1em;
}

ul,
ol {
  margin: 0 0 1em;
  padding-left: 1.25em;
}

li {
  margin-bottom: 0.35em;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

a:hover,
a:focus-visible {
  color: var(--accent-dark);
}

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

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

figure {
  margin: 0;
}

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

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

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

.visually-plain {
  font-size: 13px;
  color: var(--muted);
  font-weight: 400;
  letter-spacing: 0;
  margin: 0 0 12px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 60;
  padding: 10px 18px;
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top 0.18s ease;
}

.skip-link:focus {
  top: 12px;
  color: #fff;
}


/* --------------------------------------------------------------------------
   2. layout · 全站骨架（页头 / 导航 / 主容器 / 面包屑 / 页标题 / 页脚）
   -------------------------------------------------------------------------- */

.site-header {
  background-color: var(--ink);
  color: #f4f1ea;
  border-bottom: 3px solid var(--sand);
}

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

.brand-mark {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  color: #f4f1ea;
  text-decoration: none;
  white-space: nowrap;
  padding: 8px 0;
}

.brand-mark:hover,
.brand-mark:focus-visible {
  color: var(--sand);
}

.primary-nav.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 2px;
  justify-content: flex-end;
}

.nav-list li {
  margin: 0;
}

.nav-link {
  display: block;
  padding: 9px 11px;
  font-size: 14px;
  color: #e6e2d8;
  text-decoration: none;
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: #ffffff;
  background-color: rgba(217, 178, 111, 0.14);
}

.nav-link.is-current {
  color: #ffffff;
  border-bottom-color: var(--sand);
  font-weight: 600;
}

.mobile-nav {
  display: none;
  position: relative;
}

.mobile-nav-toggle {
  list-style: none;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  border: 1px solid rgba(244, 241, 234, 0.4);
  border-radius: var(--radius-sm);
  color: #f4f1ea;
  font-size: 14px;
}

.mobile-nav-toggle::-webkit-details-marker {
  display: none;
}

.mobile-nav-toggle::after {
  content: "栏目目录";
  margin-left: 8px;
}

.mobile-nav[open] .mobile-nav-toggle {
  background-color: rgba(217, 178, 111, 0.16);
}

.mobile-nav-list {
  list-style: none;
  margin: 0;
  padding: 8px;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  z-index: 40;
  min-width: 208px;
  background-color: var(--ink);
  border: 1px solid rgba(217, 178, 111, 0.4);
  border-radius: var(--radius);
  box-shadow: 0 12px 28px -14px rgba(0, 0, 0, 0.6);
}

.mobile-nav-list li {
  margin: 0;
}

.mobile-nav-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: #e6e2d8;
  font-size: 14px;
  text-decoration: none;
  border-radius: var(--radius-sm);
}

.mobile-nav-list a:hover,
.mobile-nav-list a:focus-visible {
  background-color: rgba(217, 178, 111, 0.16);
  color: #fff;
}

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 28px 24px 72px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 18px;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  padding: 4px 0;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

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

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

.page-header {
  margin: 0 0 18px;
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
  margin: 0;
}

.page-title-block,
.page-title-area,
.page-title-zone {
  margin: 0 0 36px;
  padding: 0 0 22px;
  border-bottom: 1px solid var(--line);
}

.page-kicker,
.page-tag,
.section-label,
.section-tag {
  display: inline-block;
  font-size: 13px;
  color: var(--accent);
  margin: 0 0 8px;
  padding: 2px 10px;
  border: 1px solid rgba(196, 85, 59, 0.4);
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.6);
}

.page-lead,
.page-lede {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 780px;
  margin: 0;
}

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

.container {
  max-width: var(--shell);
  margin: 0 auto;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--aside);
  gap: 48px;
  align-items: start;
}

.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--aside);
  gap: 48px;
  align-items: start;
}

.content-with-aside,
.content-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--aside);
  gap: 48px;
  align-items: start;
}

.page-content,
.layout-main,
.main-content,
.reading-article,
.entry-article,
.viewing-article,
.corrections-article {
  min-width: 0;
}

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

/* 页脚 */

.site-footer {
  background-color: var(--ink);
  color: #ded9cd;
  border-top: 3px solid var(--sand);
  margin-top: 24px;
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.6fr repeat(4, minmax(0, 1fr));
  gap: 32px;
}

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

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  color: #ffffff;
  margin: 0 0 10px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #b9b3a6;
  margin: 0;
  max-width: 260px;
}

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

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

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

.footer-col li {
  margin: 0 0 4px;
}

.footer-col a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 14px;
  color: #d6d1c5;
  text-decoration: none;
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: #ffffff;
  text-decoration: underline;
}

.footer-bottom {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid rgba(217, 178, 111, 0.28);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.footer-copy {
  margin: 0;
  font-size: 13px;
  color: #a8a294;
}

.back-to-top {
  font-size: 13px;
  color: var(--sand);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 6px;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  color: #ffffff;
  text-decoration: underline;
}


/* --------------------------------------------------------------------------
   3. components · 通用按钮 / 标签 / 文本链接 / 卡片 / 侧栏 / 区块标题
   -------------------------------------------------------------------------- */

.btn,
.button-primary,
.button-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  font-family: var(--font-sans);
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.btn-primary:hover,
.btn-primary:focus-visible,
.button-primary:hover,
.button-primary:focus-visible {
  background-color: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #ffffff;
}

.btn-ghost,
.button-secondary {
  background-color: transparent;
  color: var(--ink);
  border-color: var(--ink);
}

.btn-ghost:hover,
.btn-ghost:focus-visible,
.button-secondary:hover,
.button-secondary:focus-visible {
  background-color: var(--ink);
  color: #f4f1ea;
}

.btn-small {
  min-height: 40px;
  padding: 0 16px;
  font-size: 14px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 14px;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.text-link::after {
  content: "›";
  margin-left: 6px;
  font-size: 16px;
  line-height: 1;
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--accent-dark);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  margin: 0 0 20px;
}

.section-desc {
  font-size: 14px;
  color: var(--muted);
  margin: 0;
  max-width: 560px;
}

.section-heading {
  font-size: 22px;
  margin: 0 0 12px;
}

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

.section-intro {
  color: var(--ink-soft);
  margin: 0 0 18px;
  max-width: 680px;
}

.aside-card {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px;
  margin: 0 0 24px;
}

.aside-card-title,
.aside-title,
.aside-links-title {
  font-size: 17px;
  margin: 0 0 10px;
}

.aside-card p,
.aside-text {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0 0 12px;
}

.aside-link,
.aside-card-link {
  font-size: 14px;
  margin: 0;
}

.aside-links {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

.aside-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.aside-links li {
  margin: 0;
  border-top: 1px solid var(--line-soft);
}

.aside-links li:first-child {
  border-top: 0;
}

.aside-links a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
}

.aside-links a:hover,
.aside-links a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}


/* --------------------------------------------------------------------------
   4. pages · 首页
   -------------------------------------------------------------------------- */

.home-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 36px 24px 64px;
}

/* 4.1 首屏媒体焦点区 */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  gap: 40px;
  align-items: start;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  min-width: 0;
  padding-top: 4px;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  color: var(--accent);
  margin: 0 0 14px;
  padding: 2px 10px;
  border: 1px solid rgba(196, 85, 59, 0.4);
  border-radius: var(--radius-sm);
  background-color: rgba(255, 255, 255, 0.6);
}

.hero-copy h1 {
  font-size: 36px;
  line-height: 1.28;
  margin: 0 0 16px;
  max-width: 15em;
}

.hero-lead {
  font-size: 16px;
  color: var(--ink-soft);
  margin: 0 0 24px;
  max-width: 34em;
}

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

.hero-media {
  min-width: 0;
  display: grid;
  gap: 18px;
}

.hero-figure {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.hero-caption {
  padding: 0 2px;
}

.focus-index {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--sand);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.focus-index-title {
  font-size: 15px;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--muted);
  margin: 0 0 8px;
}

.focus-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.focus-index-list li {
  margin: 0;
}

.focus-index-list a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 6px 8px;
  font-size: 14px;
  color: var(--ink);
  text-align: center;
  text-decoration: none;
  background-color: var(--canvas);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.focus-index-list a:hover,
.focus-index-list a:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  background-color: #fff;
}

/* 4.2 频道轨道 */

.channel-section {
  padding: 44px 0 8px;
}

.channel-rail {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 4px 4px 16px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.channel-rail:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.channel-rail .channel-card {
  flex: 0 0 208px;
  scroll-snap-align: start;
}

.channel-card {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.channel-card:hover,
.channel-card:focus-within {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.channel-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.channel-media {
  margin: 0;
  background-color: var(--line-soft);
}

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

.channel-body {
  padding: 12px 14px 16px;
}

.channel-name {
  font-size: 17px;
  margin: 0 0 6px;
}

.channel-note,
.channel-scope,
.channel-scene {
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  margin: 0 0 6px;
}

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

.channel-rail-hint {
  font-size: 13px;
  color: var(--muted);
  margin: 4px 0 0;
  padding-left: 4px;
  border-left: 2px solid var(--sand);
}

/* 4.3 专题条目列表 */

.feature-section {
  padding: 40px 0 8px;
}

.feature-list {
  display: grid;
  gap: 16px;
}

.feature-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 28px;
  align-items: start;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-card);
}

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

.feature-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 8px;
  padding: 1px 8px;
  border: 1px solid rgba(196, 85, 59, 0.35);
  border-radius: var(--radius-sm);
}

.feature-name {
  font-size: 20px;
  margin: 0 0 8px;
}

.feature-summary {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.feature-order {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 12px;
  padding: 10px 12px;
  background-color: var(--canvas);
  border-left: 2px solid var(--sand);
  border-radius: var(--radius-sm);
}

.feature-thumb {
  margin: 0;
  background-color: var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.feature-thumb img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* 4.4 双栏阅读区 */

.reading-grid {
  margin-top: 44px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.reading-article h2 {
  font-size: 24px;
  margin: 0 0 12px;
}

.reading-article > p {
  max-width: 660px;
  color: var(--ink-soft);
}

.prep-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  counter-reset: prep;
}

.prep-item {
  position: relative;
  padding: 14px 0 14px 48px;
  border-top: 1px solid var(--line-soft);
  counter-increment: prep;
}

.prep-item::before {
  content: counter(prep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 16px;
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--sand);
}

.prep-name {
  font-size: 17px;
  margin: 0 0 6px;
}

.prep-item p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 600px;
}

/* 4.5 术语与内容边界摘要 */

.summary-section {
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

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

.term-summary,
.scope-summary {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
}

.term-summary h3,
.scope-summary h3 {
  font-size: 18px;
  margin: 0 0 10px;
}

.term-summary p,
.scope-summary p {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

/* 4.6 更正说明条 */

.correction-strip {
  margin-top: 32px;
  padding: 18px 24px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}

.correction-text {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
  max-width: 620px;
}

.correction-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}


/* --------------------------------------------------------------------------
   5. pages · 内页通用模块
   -------------------------------------------------------------------------- */

/* 5.1 频道目录 */

.channel-directory {
  padding: 0 0 8px;
}

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

.channel-grid .channel-card {
  display: flex;
  flex-direction: column;
}

.channel-grid .channel-media {
  margin: 0;
}

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

.channel-grid .channel-body {
  padding: 16px 20px 20px;
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
}

.channel-tag {
  display: inline-block;
  align-self: flex-start;
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 8px;
  padding: 1px 8px;
  border: 1px solid rgba(196, 85, 59, 0.35);
  border-radius: var(--radius-sm);
}

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

.channel-grid .channel-scope,
.channel-grid .channel-scene {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.channel-link {
  margin-top: auto;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 14px;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.channel-link::after {
  content: "›";
  margin-left: 6px;
  font-size: 16px;
}

.channel-method {
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.method-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.method-step {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

.method-num {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--accent);
  margin-bottom: 8px;
}

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

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

.related-links {
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.related-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.related-item {
  margin: 0;
  padding: 14px 18px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.related-link {
  font-size: 16px;
  font-family: var(--font-serif);
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  min-height: 32px;
}

.related-link:hover,
.related-link:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

.related-desc {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--muted);
}

/* 5.2 专题片单 */

.feature-index {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 0 0 36px;
}

.feature-index .section-heading {
  font-size: 17px;
  font-family: var(--font-sans);
  color: var(--muted);
  margin: 0 0 12px;
}

.feature-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.feature-index-list li {
  margin: 0;
}

.feature-index-list a {
  display: block;
  min-height: 44px;
  padding: 10px 12px;
  background-color: var(--canvas);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--ink);
}

.feature-index-list a:hover,
.feature-index-list a:focus-visible {
  border-color: var(--accent);
}

.feature-index-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 2px;
}

.feature-index-desc {
  display: block;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
}

.feature-long-list {
  display: grid;
  gap: 28px;
}

.feature-entry {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-card);
  scroll-margin-top: 96px;
}

.feature-cover {
  margin: 0;
  background-color: var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.feature-cover img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

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

.feature-meta {
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 6px;
  padding: 1px 8px;
  display: inline-block;
  border: 1px solid rgba(196, 85, 59, 0.35);
  border-radius: var(--radius-sm);
}

.feature-text h3 {
  font-size: 21px;
  margin: 0 0 8px;
}

.feature-text > p {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0 0 12px;
}

.feature-subheading {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  margin: 0 0 6px;
}

.feature-order {
  margin: 0 0 12px;
  padding-left: 1.4em;
  font-size: 14px;
  color: var(--ink-soft);
}

.feature-order li {
  margin-bottom: 4px;
}

.feature-channel {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.feature-mapping {
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.mapping-lede {
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 680px;
  margin: 0 0 16px;
}

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

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

.mapping-table th,
.mapping-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: top;
}

.mapping-table thead th {
  background-color: #eeeadf;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--ink);
  white-space: nowrap;
}

.mapping-table tbody th {
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--ink);
  white-space: nowrap;
}

.mapping-table tbody tr:last-child th,
.mapping-table tbody tr:last-child td {
  border-bottom: 0;
}

.mapping-table a {
  color: var(--accent);
}

.related-guide-links {
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

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

.related-guide-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.related-guide-item h3 {
  font-size: 17px;
  margin: 0 0 8px;
}

.related-guide-item p {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0 0 10px;
}

.related-guide-item a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 14px;
}

/* 5.3 观看指南 */

.guide-section {
  margin: 0 0 36px;
}

.guide-section h2 {
  font-size: 22px;
  margin: 0 0 10px;
}

.guide-section > p {
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.guide-figure {
  margin: 0 0 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
}

.guide-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.guide-figure figcaption {
  padding: 0 2px;
}

.prep-list {
  margin: 0;
}

dl.prep-list {
  display: grid;
  gap: 0;
}

.viewing-article .prep-item {
  padding: 14px 0 14px 48px;
  border-top: 1px solid var(--line-soft);
}

.viewing-article .prep-item:first-child {
  border-top: 0;
}

.viewing-article .prep-item dt {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 4px;
}

.viewing-article .prep-item dd {
  margin: 0;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 600px;
}

.order-steps {
  margin: 0 0 16px;
  padding-left: 1.4em;
  color: var(--ink-soft);
}

.order-step {
  margin-bottom: 10px;
  font-size: 15px;
}

.tips-accordion {
  display: grid;
  gap: 8px;
  margin: 0;
}

.tip-item {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 16px;
}

.tip-item summary {
  cursor: pointer;
  min-height: 48px;
  display: flex;
  align-items: center;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

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

.tip-item summary::before {
  content: "+";
  display: inline-block;
  width: 18px;
  margin-right: 8px;
  color: var(--accent);
  font-family: var(--font-sans);
}

.tip-item[open] summary::before {
  content: "–";
}

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

/* 5.4 入口核验 */

.scope-summary {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin: 0 0 36px;
}

.scope-title,
.scope-summary-title {
  font-size: 19px;
  margin: 0 0 10px;
}

.scope-text {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0 0 12px;
  max-width: 760px;
}

.scope-tags {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.scope-tag {
  font-size: 13px;
  color: var(--ink-soft);
  padding: 3px 12px;
  background-color: var(--canvas);
  border: 1px solid var(--line);
  border-radius: 999px;
  margin: 0;
}

.scope-link,
.scope-summary-link {
  margin: 0;
  font-size: 14px;
}

.entry-article .check-section,
.entry-article .anomaly-section,
.entry-article .boundary-section {
  margin: 0 0 36px;
}

.entry-article h2 {
  font-size: 22px;
  margin: 0 0 10px;
}

.check-figure {
  margin: 0 0 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
}

.check-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

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

.check-row {
  position: relative;
  counter-increment: check;
  padding: 16px 0 16px 52px;
  border-top: 1px solid var(--line-soft);
}

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

.check-index {
  position: absolute;
  left: 0;
  top: 18px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--ink);
  background-color: var(--canvas);
  border: 1px solid var(--sand);
  border-radius: 50%;
}

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

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

.check-observe {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0 0 6px;
  max-width: 620px;
}

.check-hint {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  padding-left: 10px;
  border-left: 2px solid var(--sand);
}

.anomaly-table {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
  overflow: hidden;
}

.anomaly-row {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

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

.anomaly-sign {
  margin: 0;
  padding: 14px 16px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  background-color: #f7f4ed;
  border-right: 1px solid var(--line-soft);
}

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

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

.boundary-item {
  position: relative;
  padding: 10px 0 10px 22px;
  font-size: 15px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line-soft);
}

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

.boundary-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 20px;
  width: 8px;
  height: 2px;
  background-color: var(--sand);
}

.entry-check .layout-aside .aside-card {
  margin-bottom: 20px;
}

.entry-check .aside-link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.entry-check .aside-link-list li {
  margin: 0;
  border-top: 1px solid var(--line-soft);
}

.entry-check .aside-link-list li:first-child {
  border-top: 0;
}

.entry-check .aside-link-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
}

.entry-check .aside-link-list a:hover,
.entry-check .aside-link-list a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

/* 5.5 术语说明 */

.glossary-figure {
  margin: 0 0 32px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
}

.glossary-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.glossary-section {
  margin: 0 0 40px;
}

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

.term-column {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 22px;
}

.term-list {
  margin: 0;
}

.term-row {
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

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

.term-row dt {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--ink);
}

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

.term-row dd.term-meta {
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

.term-meta a {
  color: var(--accent);
}

.usage-note {
  margin: 0 0 40px;
  padding: 24px 26px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.usage-note-body p {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0 0 12px;
  max-width: 780px;
}

.usage-note-body p:last-child {
  margin-bottom: 0;
}

.related-reading {
  margin: 0;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

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

.related-reading .related-list li {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.related-reading .related-list a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-serif);
}

.related-reading .related-list a:hover,
.related-reading .related-list a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

.related-note {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
  line-height: 1.6;
}

/* 5.6 内容说明 */

.policy-section {
  margin: 0 0 36px;
}

.policy-section h2 {
  font-size: 22px;
  margin: 0 0 10px;
}

.policy-section > p {
  color: var(--ink-soft);
  margin: 0 0 16px;
  max-width: 680px;
}

.policy-figure {
  margin: 0 0 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
}

.policy-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.policy-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.policy-list li {
  margin: 0;
  padding: 14px 18px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
  border-radius: var(--radius);
}

.policy-list h3 {
  font-size: 16px;
  margin: 0 0 6px;
}

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

.boundary-note {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 14px;
  max-width: 680px;
}

.update-note {
  margin: 0 0 16px;
  padding: 14px 18px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--ink-soft);
  max-width: 680px;
}

.update-steps {
  margin: 0 0 16px;
  padding-left: 1.4em;
  color: var(--ink-soft);
  font-size: 15px;
}

.update-steps li {
  margin-bottom: 8px;
}

/* 5.7 更正与反馈 */

.content-block {
  margin: 0 0 36px;
}

.content-block h2 {
  font-size: 22px;
  margin: 0 0 10px;
}

.block-intro {
  color: var(--ink-soft);
  margin: 0 0 16px;
  max-width: 680px;
}

.article-media {
  margin: 0 0 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px;
}

.article-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.correctable-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.correctable-item {
  margin: 0;
  padding: 14px 18px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.correctable-item h3 {
  font-size: 16px;
  margin: 0 0 6px;
}

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

.prepare-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.prepare-item {
  margin: 0;
  padding: 16px 18px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--sand);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--ink-soft);
}

.principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.principle-item {
  margin: 0;
  padding: 14px 18px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--ink-soft);
}

.sidebar-title {
  font-size: 19px;
  margin: 0 0 8px;
}

.sidebar-note {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.sidebar-links {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 18px;
  margin: 0 0 20px;
}

.sidebar-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-links li {
  margin: 0;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
}

.sidebar-links li:first-child {
  border-top: 0;
}

.sidebar-links a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-serif);
}

.sidebar-links a:hover,
.sidebar-links a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

.link-note {
  display: block;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
  margin-top: 2px;
}

.sidebar-card {
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--sand);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.sidebar-card h3 {
  font-size: 16px;
  margin: 0 0 10px;
}

.sidebar-mini-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-mini-links li {
  margin: 0;
  border-top: 1px solid var(--line-soft);
}

.sidebar-mini-links li:first-child {
  border-top: 0;
}

.sidebar-mini-links a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  color: var(--ink-soft);
  text-decoration: none;
}

.sidebar-mini-links a:hover,
.sidebar-mini-links a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

/* 5.8 404 */

.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 24px 72px;
}

.error-panel {
  max-width: 720px;
  padding: 32px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
}

.error-code {
  font-family: var(--font-serif);
  font-size: 40px;
  color: var(--sand);
  margin: 0 0 6px;
  line-height: 1;
}

.error-panel h1 {
  font-size: 30px;
  margin: 0 0 12px;
}

.error-lead {
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.error-reasons {
  margin: 0 0 22px;
  padding-left: 1.3em;
  font-size: 15px;
  color: var(--ink-soft);
}

.error-reasons li {
  margin-bottom: 6px;
}

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

.error-guides {
  max-width: 720px;
  margin-top: 40px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.error-guides h2 {
  font-size: 20px;
  margin: 0 0 14px;
}

.error-guide-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.error-guide-list li {
  margin: 0;
}

.error-guide-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--ink);
  text-decoration: none;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-guide-list a:hover,
.error-guide-list a:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}


/* --------------------------------------------------------------------------
   6. responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1080px) {
  .nav-link {
    padding: 9px 8px;
    font-size: 13px;
  }

  .hero {
    gap: 28px;
  }

  .feature-row {
    grid-template-columns: minmax(0, 1fr) 200px;
  }

  .feature-entry {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 22px;
  }
}

@media (max-width: 960px) {
  .header-inner {
    height: 64px;
  }

  .primary-nav.site-nav {
    display: none;
  }

  .mobile-nav {
    display: block;
  }

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

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

  .footer-brand-desc {
    max-width: none;
  }

  .inner-main {
    padding: 24px 20px 56px;
  }

  .home-main {
    padding: 28px 20px 52px;
  }

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

  .hero-copy h1 {
    max-width: none;
    font-size: 32px;
  }

  .hero-media {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: start;
    gap: 16px;
  }

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

  .reading-aside,
  .page-aside,
  .layout-aside,
  .sidebar {
    max-width: none;
  }

  .feature-entry {
    grid-template-columns: 220px minmax(0, 1fr);
  }

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

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

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

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

@media (max-width: 720px) {
  body.site-body {
    font-size: 15px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 21px;
  }

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

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

  .inner-main {
    padding: 20px 16px 48px;
  }

  .home-main {
    padding: 22px 16px 44px;
  }

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

  .page-title-block,
  .page-title-area,
  .page-title-zone {
    margin-bottom: 28px;
    padding-bottom: 18px;
  }

  .page-title-inner {
    padding: 0 16px;
  }

  .breadcrumb {
    font-size: 12px;
    margin-bottom: 14px;
  }

  .hero-copy h1 {
    font-size: 27px;
  }

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

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

  .channel-rail .channel-card {
    flex: 0 0 172px;
  }

  .channel-section {
    padding-top: 32px;
  }

  .feature-section {
    padding-top: 30px;
  }

  .feature-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 18px;
  }

  .feature-thumb {
    order: -1;
  }

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

  .reading-grid {
    margin-top: 32px;
    padding-top: 26px;
  }

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

  .correction-strip {
    padding: 16px 18px;
    flex-direction: column;
    align-items: flex-start;
  }

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

  .channel-method,
  .related-links,
  .feature-mapping,
  .related-guide-links {
    margin-top: 32px;
    padding-top: 26px;
  }

  .method-steps {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .feature-index {
    padding: 16px;
    margin-bottom: 28px;
  }

  .feature-index-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .feature-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 18px;
  }

  .feature-cover img {
    aspect-ratio: 16 / 9;
  }

  .related-guide-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .scope-summary {
    padding: 18px;
    margin-bottom: 28px;
  }

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

  .anomaly-sign {
    border-right: 0;
    border-bottom: 1px solid var(--line-soft);
  }

  .check-row {
    padding-left: 46px;
  }

  .check-index {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }

  .glossary-figure {
    margin-bottom: 24px;
  }

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

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

  .term-column {
    padding: 6px 18px;
  }

  .usage-note {
    padding: 18px;
    margin-bottom: 30px;
  }

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

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

  .policy-list li,
  .correctable-item,
  .principle-item {
    padding: 12px 14px;
  }

  .sidebar-links {
    padding: 6px 16px;
  }

  .error-main {
    padding: 36px 16px 52px;
  }

  .error-panel {
    padding: 24px 20px;
  }

  .error-code {
    font-size: 32px;
  }

  .error-panel h1 {
    font-size: 24px;
  }

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

  .footer-inner {
    padding: 36px 16px 24px;
    gap: 24px;
  }

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

  .footer-col a {
    min-height: 40px;
  }
}

@media (max-width: 420px) {
  .hero-copy h1 {
    font-size: 25px;
  }

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

  .channel-rail .channel-card {
    flex: 0 0 158px;
  }

  .channel-grid .channel-body {
    padding: 14px 16px 18px;
  }

  .feature-index-name {
    font-size: 14px;
  }

  .term-summary,
  .scope-summary {
    padding: 18px;
  }

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

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

  .channel-card,
  .skip-link,
  .btn,
  .button-primary,
  .button-secondary {
    transition: none;
  }

  .channel-card:hover,
  .channel-card:focus-within {
    transform: none;
  }
}