/* ==========================================================================
   泥巴影视 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base — 变量、重置、排版基础
   -------------------------------------------------------------------------- */
:root {
  --c-ink: #14161a;
  --c-ink-soft: #5a6068;
  --c-paper: #f6f5f2;
  --c-white: #ffffff;
  --c-accent: #3f5c66;
  --c-warm: #8c6a4a;
  --c-line: #dfe3e1;
  --c-hover: #b9c2c0;

  --font-serif: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;

  --w-wide: 1160px;
  --w-narrow: 960px;
  --w-read: 760px;
  --pad-x: 24px;

  --radius: 3px;
  --line: 1px solid var(--c-line);
}

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

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

body {
  margin: 0;
  background-color: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.78;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.35;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

p {
  margin: 0 0 1em;
}

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

a {
  color: var(--c-accent);
  text-decoration: none;
  transition: color 0.18s ease;
}

a:hover {
  color: var(--c-ink);
}

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

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

figure {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

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

time {
  font-variant-numeric: tabular-nums;
}

/* 屏幕阅读器专用 */
.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;
}

/* --------------------------------------------------------------------------
   2. layout — 页头、导航、主容器、页脚骨架
   -------------------------------------------------------------------------- */

/* 页头 */
.site-header {
  background-color: var(--c-paper);
  border-bottom: var(--line);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--w-wide);
  height: 64px;
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-ink);
  white-space: nowrap;
}

.brand:hover {
  color: var(--c-accent);
}

/* 主导航 */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

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

.nav-list > li > a {
  position: relative;
  display: block;
  padding: 8px 12px;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
  white-space: nowrap;
}

.nav-list > li > a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background-color: var(--c-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
}

.nav-list > li > a:hover {
  color: var(--c-ink);
}

.nav-list > li > a:hover::after,
.nav-list > li > a.is-current::after {
  transform: scaleX(1);
}

.nav-list > li > a.is-current {
  color: var(--c-ink);
}

/* 汉堡按钮与抽屉 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: 0;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  margin: 0 auto;
  background-color: var(--c-ink);
}

.mobile-drawer {
  display: none;
}

/* 主内容 */
.site-main {
  display: block;
}

.home-main {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 0 var(--pad-x) 72px;
}

.inner-main {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 0 var(--pad-x) 72px;
}

.page-container {
  max-width: var(--w-wide);
  margin: 0 auto;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 24px 0 0;
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

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

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

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

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

/* 页面标题区（内页统一） */
.page-header {
  padding: 20px 0 24px;
}

.page-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.4vw, 2.75rem);
  font-weight: 600;
  line-height: 1.28;
  color: var(--c-ink);
}

.rule {
  height: 0;
  margin: 0 0 40px;
  border: 0;
  border-top: var(--line);
}

/* 页脚 */
.site-footer {
  background-color: var(--c-paper);
  border-top: var(--line);
}

.footer-inner {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 48px var(--pad-x) 32px;
}

.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: var(--line);
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--c-ink);
}

.footer-slogan {
  margin: 0;
  font-size: 0.875rem;
  color: var(--c-ink-soft);
}

.footer-nav {
  padding: 24px 0;
  border-bottom: var(--line);
}

.footer-nav-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px 24px;
}

.footer-nav-list > li > a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--c-ink-soft);
}

.footer-nav-list > li > a:hover {
  color: var(--c-accent);
}

.footer-nav-list > li > a.is-current {
  font-weight: 600;
  color: var(--c-accent);
}

.current-mark {
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

.footer-guide {
  padding: 24px 0;
  border-bottom: var(--line);
}

.footer-guide-title {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

.footer-guide-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px 24px;
}

.footer-guide-list > li {
  font-size: 0.875rem;
  color: var(--c-ink-soft);
  line-height: 1.7;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
}

.footer-copy {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

.footer-bottom-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-bottom-links a {
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

.footer-bottom-links a:hover {
  color: var(--c-accent);
}

/* --------------------------------------------------------------------------
   3. components — 通用按钮、标签、提示条、表格、图片、入口带、相关内容
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  font-size: 0.9375rem;
  line-height: 1.2;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.btn-primary {
  background-color: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-white);
}

.btn-primary:hover {
  background-color: #35505a;
  border-color: #35505a;
  color: var(--c-white);
}

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

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

/* 标签胶囊 */
.tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  white-space: nowrap;
}

.tag-channel {
  background-color: var(--c-white);
  border: 1px solid var(--c-line);
  color: var(--c-warm);
}

/* 提示条 */
.notice-bar {
  padding: 16px 20px;
  background-color: var(--c-white);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--radius);
}

.notice-bar p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

/* 图片容器 */
.hero-figure,
.card-figure,
.media-figure,
.channel-visual,
.compare-figure,
.verify-media,
.year-figure,
.glossary-figure {
  overflow: hidden;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.hero-figure img,
.card-figure img,
.media-figure img,
.channel-visual img,
.compare-figure img,
.verify-media img,
.year-figure img,
.glossary-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

figcaption {
  padding: 10px 14px;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--c-ink-soft);
  border-top: var(--line);
}

/* 数据表通用 */
.data-table,
.diff-table,
.dimension-table,
.misjudge-table,
.channel-table {
  font-size: 0.9375rem;
}

.data-table th,
.data-table td,
.diff-table th,
.diff-table td,
.dimension-table th,
.dimension-table td,
.misjudge-table th,
.misjudge-table td,
.channel-table th,
.channel-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--line);
}

.data-table thead th,
.diff-table thead th,
.dimension-table thead th,
.misjudge-table thead th,
.channel-table thead th {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
  background-color: var(--c-white);
  border-top: var(--line);
}

.data-table tbody th,
.diff-table tbody th,
.dimension-table tbody th {
  font-weight: 600;
  color: var(--c-ink);
}

.table-caption {
  padding: 12px 16px 0;
  font-size: 0.8125rem;
  text-align: left;
  color: var(--c-ink-soft);
}

/* 入口带 */
.entry-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 48px;
  padding: 28px 32px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.entry-band-text h2,
.entry-band-text p {
  margin: 0 0 6px;
}

.entry-band-text h2 {
  font-size: 1.25rem;
}

.entry-band-text p {
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.entry-band-links,
.entry-band-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-entry,
.entry-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 0.9375rem;
  color: var(--c-ink);
  background-color: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, color 0.18s ease;
}

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

/* 相关内容条 */
.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  max-width: var(--w-wide);
  margin: 48px auto 0;
  padding: 20px 0 0;
  border-top: var(--line);
}

.related-links-label {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

.related-links-item {
  font-size: 0.9375rem;
  color: var(--c-accent);
}

.related-links-item:hover {
  color: var(--c-ink);
}

/* 通用小标题与说明 */
.section-note,
.section-intro {
  margin: 8px 0 24px;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.side-title {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--c-ink-soft);
}

.side-note {
  margin: 0 0 16px;
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

.link-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.875rem;
  color: var(--c-accent);
}

.link-more:hover {
  color: var(--c-ink);
}

/* --------------------------------------------------------------------------
   4. pages — 首页
   -------------------------------------------------------------------------- */

/* 首屏三栏 */
.hero-grid {
  display: grid;
  grid-template-columns: 5fr 3fr 4fr;
  gap: 40px;
  padding: 48px 0 56px;
  border-bottom: var(--line);
}

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

.brand-line {
  margin: 0 0 14px;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-warm);
}

.hero-focus h1 {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.4vw, 2.75rem);
  font-weight: 600;
  line-height: 1.28;
  color: var(--c-ink);
}

.hero-lead {
  margin: 0 0 22px;
  font-size: 1rem;
  color: var(--c-ink-soft);
}

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

.hero-figure {
  margin: 0;
}

.hero-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.hero-channels,
.hero-latest {
  min-width: 0;
  padding-left: 32px;
  border-left: var(--line);
}

.channel-filter {
  display: grid;
  gap: 8px;
}

.channel-filter a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 0.9375rem;
  color: var(--c-ink);
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.channel-filter a:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

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

.latest-list > li {
  display: grid;
  gap: 6px;
  padding-bottom: 14px;
  border-bottom: var(--line);
}

.latest-list > li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.latest-list a {
  font-size: 0.9375rem;
  color: var(--c-ink);
}

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

.latest-list time {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--c-ink-soft);
}

/* 角色分流 */
.role-split {
  padding: 56px 0;
  border-bottom: var(--line);
}

.role-split h2 {
  margin: 0;
}

.role-list {
  border-top: var(--line);
}

.role-row {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(320px, 2fr);
  gap: 32px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: var(--line);
}

.role-who {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.role-name {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--c-ink);
}

.role-signal {
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

.role-advice {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
}

.role-advice p {
  flex: 1 1 320px;
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.role-advice a {
  font-size: 0.875rem;
  white-space: nowrap;
}

/* 频道索引 */
.channel-index {
  padding: 56px 0;
  border-bottom: var(--line);
}

.channel-index h2 {
  margin: 0;
}

.channel-rows {
  border-top: var(--line);
}

.channel-row {
  display: grid;
  grid-template-columns: 56px minmax(120px, 1fr) minmax(240px, 2fr) minmax(200px, 1.6fr) 32px;
  gap: 20px;
  align-items: center;
  padding: 18px 12px;
  border-bottom: var(--line);
  transition: background-color 0.18s ease, transform 0.18s ease;
}

.channel-row:hover {
  background-color: var(--c-white);
  transform: translateX(2px);
}

.ch-no {
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  color: var(--c-warm);
}

.ch-name {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--c-ink);
}

.ch-desc,
.ch-when {
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.ch-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--c-accent);
  border: var(--line);
  border-radius: var(--radius);
}

.ch-arrow::before {
  content: "→";
  font-size: 0.9375rem;
}

.ch-arrow:hover {
  border-color: var(--c-accent);
}

/* 专题年表片段 */
.timeline-snippet {
  padding: 56px 0;
  border-bottom: var(--line);
}

.timeline-snippet h2 {
  margin: 0;
}

.year-block {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 32px;
  padding: 28px 0;
  border-top: var(--line);
}

.year-mark {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 600;
  line-height: 1;
  color: var(--c-warm);
}

.year-body {
  display: grid;
  gap: 12px;
}

.year-topics {
  display: grid;
  gap: 8px;
}

.year-topics a {
  font-size: 1rem;
  color: var(--c-ink);
}

.year-topics a:hover {
  color: var(--c-accent);
}

.year-scope {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

/* 视频卡片样本 */
.video-samples {
  padding: 56px 0;
  border-bottom: var(--line);
}

.video-samples h2 {
  margin: 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.video-card {
  min-width: 0;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease;
}

.video-card:hover {
  border-color: var(--c-hover);
}

.video-card > a {
  display: block;
  padding: 0 0 18px;
  color: inherit;
}

.card-figure {
  margin: 0 0 14px;
  border: 0;
  border-bottom: var(--line);
  border-radius: 0;
}

.card-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.video-card .tag-channel {
  margin: 0 18px 8px;
}

.card-title {
  margin: 0 18px 8px;
  font-size: 1.0625rem;
  color: var(--c-ink);
}

.card-desc {
  margin: 0 18px;
  font-size: 0.875rem;
  color: var(--c-ink-soft);
}

/* 起步三步 */
.start-steps {
  padding: 56px 0;
  border-bottom: var(--line);
}

.start-steps h2 {
  margin: 0;
}

.step-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.step-item {
  padding: 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.step-item .step-no {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  color: var(--c-warm);
}

.step-detail {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 8px 12px;
  margin: 0;
  font-size: 0.9375rem;
}

.step-detail dt {
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--c-ink-soft);
}

.step-detail dd {
  margin: 0;
  color: var(--c-ink);
}

/* 页面识别三列 */
.verify-cols {
  padding: 56px 0;
  border-bottom: var(--line);
}

.verify-cols h2 {
  margin: 0;
}

.verify-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.verify-item {
  padding: 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.verify-item h3 {
  margin: 0 0 10px;
}

.verify-item > p {
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.verify-do {
  padding-top: 10px;
  border-top: var(--line);
  color: var(--c-ink);
}

/* 边界与反馈 */
.boundary-feedback {
  padding: 56px 0;
  border-bottom: var(--line);
}

.boundary-feedback h2 {
  margin: 0 0 24px;
}

.boundary-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 48px;
}

.boundary-col h3 {
  margin: 0 0 10px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

.boundary-list {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}

.boundary-list > li {
  position: relative;
  padding-left: 18px;
  font-size: 0.9375rem;
  color: var(--c-ink);
}

.boundary-list > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 8px;
  height: 1px;
  background-color: var(--c-accent);
}

.boundary-list-no > li::before {
  background-color: var(--c-hover);
}

.boundary-list-no > li {
  color: var(--c-ink-soft);
}

.feedback-col {
  padding: 28px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.feedback-col > p {
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.feedback-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

/* 常见问题 */
.faq-section {
  padding: 56px 0 0;
}

.faq-section h2 {
  margin: 0;
}

.faq-list {
  border-top: var(--line);
}

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 14px 0;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--c-ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--c-accent);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 0 18px;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

/* --------------------------------------------------------------------------
   5. pages — 内页通用栏式布局
   -------------------------------------------------------------------------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px;
  align-items: start;
}

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

.page-aside {
  min-width: 0;
  padding: 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.page-aside h2 {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

.aside-lead {
  margin: 0 0 16px;
  font-size: 0.875rem;
  color: var(--c-ink-soft);
}

.aside-list {
  display: grid;
  gap: 18px;
}

.aside-item {
  padding-top: 16px;
  border-top: var(--line);
}

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

.aside-item h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.aside-item p {
  margin: 0 0 8px;
  font-size: 0.875rem;
  color: var(--c-ink-soft);
}

.aside-link {
  font-size: 0.875rem;
}

/* --------------------------------------------------------------------------
   6. pages — 初访路径
   -------------------------------------------------------------------------- */
.page-viewing-paths .page-title {
  margin: 0;
}

.page-kicker {
  margin: 0 0 10px;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-warm);
}

.page-lead {
  margin: 16px 0 0;
  font-size: 1rem;
  color: var(--c-ink-soft);
}

.path-map {
  margin-bottom: 48px;
}

.path-map h2 {
  margin: 0 0 8px;
}

.path-map > p {
  color: var(--c-ink-soft);
}

.media-figure {
  margin-top: 20px;
}

.media-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

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

.steps-section h2 {
  margin: 0 0 8px;
}

.steps-section > p {
  color: var(--c-ink-soft);
}

.step-block {
  margin-top: 28px;
  padding: 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.step-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: var(--line);
}

.step-head h3 {
  margin: 0;
}

.step-head .step-no {
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  color: var(--c-warm);
}

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

.step-cell {
  min-width: 0;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.signal-summary {
  margin-bottom: 48px;
}

.signal-summary h2 {
  margin: 0 0 8px;
}

.signal-summary > p {
  color: var(--c-ink-soft);
}

.signal-summary .data-table {
  background-color: var(--c-white);
  border: var(--line);
}

/* --------------------------------------------------------------------------
   7. pages — 题材频道
   -------------------------------------------------------------------------- */
.page-genres .page-header {
  padding-top: 20px;
}

.page-intro {
  margin-bottom: 40px;
}

.intro-label {
  margin: 0 0 8px;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-warm);
}

.intro-lead {
  margin: 0;
  font-size: 1rem;
  color: var(--c-ink-soft);
}

.channel-table-section {
  margin-bottom: 48px;
}

.channel-table-section h2 {
  margin: 0;
}

.channel-table-wrap {
  overflow-x: auto;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.channel-table {
  min-width: 860px;
}

.channel-table tbody tr:hover {
  background-color: var(--c-paper);
}

.channel-no {
  font-family: var(--font-serif);
  color: var(--c-warm);
  white-space: nowrap;
}

.channel-name {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--c-ink);
  white-space: nowrap;
}

.channel-desc,
.channel-when,
.channel-who {
  color: var(--c-ink-soft);
}

.channel-enter a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  color: var(--c-accent);
  border: var(--line);
  border-radius: var(--radius);
}

.channel-enter a:hover {
  border-color: var(--c-accent);
}

.channel-visual-section {
  margin-bottom: 48px;
}

.channel-visual-section h2 {
  margin: 0;
}

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

.channel-visual img {
  aspect-ratio: 4 / 3;
  height: auto;
}

.channel-signal-section {
  margin-bottom: 8px;
}

.channel-signal-section h2 {
  margin: 0;
}

.channel-signal-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.signal-card {
  padding: 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.signal-card h3 {
  margin: 0 0 10px;
}

.signal-card p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

/* --------------------------------------------------------------------------
   8. pages — 专题年表
   -------------------------------------------------------------------------- */
.page-head {
  padding: 24px 0 0;
}

.page-timeline .page-head .page-kicker {
  margin: 0 0 10px;
}

.timeline-intro {
  margin-bottom: 40px;
}

.timeline-intro h2 {
  margin: 0 0 12px;
}

.timeline-intro p {
  color: var(--c-ink-soft);
}

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

.timeline-section > h2 {
  margin: 0 0 24px;
}

.year-cluster {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 40px;
  padding: 32px 0;
  border-top: var(--line);
}

.year-badge {
  display: grid;
  gap: 6px;
  align-content: start;
}

.year-num {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 600;
  line-height: 1;
  color: var(--c-warm);
}

.year-note {
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

.year-entries {
  display: grid;
  gap: 20px;
  min-width: 0;
}

.year-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

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

.year-entry {
  padding-bottom: 16px;
  border-bottom: var(--line);
}

.year-entry:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.year-entry-link {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--c-ink);
}

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

.year-entry-desc {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.neighbor-diff {
  margin-bottom: 8px;
}

.neighbor-diff h2 {
  margin: 0 0 8px;
}

.neighbor-diff > p {
  color: var(--c-ink-soft);
}

.diff-table {
  margin-top: 20px;
  background-color: var(--c-white);
  border: var(--line);
}

.diff-table caption {
  padding: 14px 16px 0;
  font-size: 0.8125rem;
  text-align: left;
  color: var(--c-ink-soft);
}

/* --------------------------------------------------------------------------
   9. pages — 片单对读
   -------------------------------------------------------------------------- */
.page-title-block {
  padding: 24px 0 0;
}

.page-eyebrow {
  margin: 0 0 10px;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-warm);
}

.compare-stage {
  margin-bottom: 48px;
}

.section-title {
  margin: 0;
  font-size: 1.5rem;
}

.compare-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 160px minmax(0, 1fr);
  gap: 24px;
  align-items: stretch;
}

.compare-item {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 20px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.compare-figure {
  margin-bottom: 14px;
}

.compare-figure img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.compare-item .tag-channel {
  align-self: flex-start;
  margin-bottom: 10px;
}

.compare-name {
  margin: 0 0 12px;
  font-size: 1.125rem;
}

.compare-points {
  display: grid;
  gap: 8px;
  margin-top: auto;
}

.compare-points > li {
  position: relative;
  padding-left: 16px;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.compare-points > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 6px;
  height: 1px;
  background-color: var(--c-accent);
}

.compare-axis {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  padding: 20px 0;
  text-align: center;
}

.axis-label {
  margin: 0;
  padding: 10px 0;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
  border-bottom: var(--line);
}

.axis-label:last-child {
  border-bottom: 0;
}

.compare-dimensions {
  margin-bottom: 48px;
}

.compare-dimensions h2 {
  margin: 0;
}

.dimension-table {
  margin-top: 20px;
  background-color: var(--c-white);
  border: var(--line);
}

.dimension-table thead th:first-child {
  width: 160px;
}

.compare-limit {
  margin-bottom: 48px;
}

.compare-limit h2 {
  margin: 0 0 16px;
}

.compare-options {
  margin-bottom: 48px;
}

.compare-options h2 {
  margin: 0;
}

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

.option-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  padding: 20px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.option-item .tag-channel {
  margin: 0;
}

.option-name {
  flex: 1 1 160px;
  margin: 0;
  font-size: 1rem;
}

.option-pick {
  min-height: 44px;
  padding: 8px 18px;
  font-size: 0.875rem;
  color: var(--c-ink);
  background-color: var(--c-paper);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.option-pick:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.option-pick:disabled {
  color: var(--c-ink-soft);
  background-color: var(--c-paper);
  border-color: var(--c-line);
  cursor: not-allowed;
  opacity: 0.7;
}

.compare-next h2 {
  margin: 0;
}

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

.next-links > li > a {
  display: flex;
  align-items: center;
  min-height: 52px;
  padding: 12px 18px;
  font-size: 0.9375rem;
  color: var(--c-ink);
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.next-links > li > a:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

/* --------------------------------------------------------------------------
   10. pages — 页面识别
   -------------------------------------------------------------------------- */
.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px;
  align-items: start;
}

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

.content-aside {
  min-width: 0;
  padding: 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.aside-title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-ink-soft);
}

.aside-intro {
  margin: 0 0 16px;
  font-size: 0.875rem;
  color: var(--c-ink-soft);
}

.aside-steps {
  display: grid;
  gap: 14px;
  counter-reset: aside-step;
}

.aside-steps > li {
  display: grid;
  gap: 4px;
  padding-top: 14px;
  border-top: var(--line);
}

.aside-steps > li:first-child {
  padding-top: 0;
  border-top: 0;
}

.aside-step-name {
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-ink);
}

.aside-step-note {
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

.aside-note {
  margin-top: 20px;
  padding-top: 16px;
  border-top: var(--line);
}

.aside-note p {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

.page-description {
  margin: 0 0 8px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--c-warm);
}

.page-divider {
  display: none;
}

.verify-checks {
  margin-bottom: 48px;
}

.verify-checks h2 {
  margin: 0;
}

.check-block {
  margin-top: 28px;
  padding: 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

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

.check-head h3 {
  margin: 0;
}

.check-index {
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  color: var(--c-warm);
}

.check-desc {
  margin: 0 0 18px;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.check-columns {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 24px;
  padding-top: 18px;
  border-top: var(--line);
}

.check-do,
.check-anti {
  min-width: 0;
  font-size: 0.9375rem;
}

.check-anti {
  padding-left: 20px;
  border-left: var(--line);
  color: var(--c-ink-soft);
}

.check-list {
  display: grid;
  gap: 8px;
}

.check-list > li {
  position: relative;
  padding-left: 16px;
}

.check-list > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 6px;
  height: 1px;
  background-color: var(--c-accent);
}

.check-anti-text {
  margin: 0;
}

.verify-figure {
  margin-bottom: 48px;
}

.verify-figure h2 {
  margin: 0;
}

.verify-media {
  margin-top: 20px;
}

.verify-media img {
  aspect-ratio: 16 / 9;
  height: auto;
}

.verify-misjudge {
  margin-bottom: 48px;
}

.verify-misjudge h2 {
  margin: 0;
}

.misjudge-table {
  margin-top: 20px;
  background-color: var(--c-white);
  border: var(--line);
}

.verify-next {
  margin-bottom: 48px;
}

.verify-next h2 {
  margin: 0;
}

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

.next-card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.next-card h3 {
  margin: 0 0 10px;
}

.next-card p {
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.next-link {
  align-self: flex-start;
  margin-top: auto;
  font-size: 0.875rem;
}

.verify-related h2 {
  margin: 0;
}

.related-list {
  display: grid;
  gap: 14px;
}

.related-list > li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 14px 0;
  border-top: var(--line);
}

.related-list > li > a {
  font-size: 0.9375rem;
}

.related-list > li > span {
  font-size: 0.8125rem;
  color: var(--c-ink-soft);
}

/* --------------------------------------------------------------------------
   11. pages — 站内术语
   -------------------------------------------------------------------------- */
.page-glossary .page-head {
  max-width: var(--w-narrow);
  margin: 0 auto;
}

.page-tag {
  margin: 0 0 10px;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--c-warm);
}

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

.glossary-table-section {
  margin-bottom: 48px;
}

.glossary-table-section h2 {
  margin: 0;
}

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

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

.glossary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 40px;
  margin: 0;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.glossary-item {
  padding: 18px 22px;
  border-bottom: var(--line);
}

.glossary-item:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.glossary-term {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-ink);
}

.glossary-cat {
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--c-warm);
}

.glossary-item dd {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

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

.confusable-section h2 {
  margin: 0;
}

.confusable-group {
  margin-top: 24px;
  padding: 22px 24px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.confusable-group h3 {
  margin: 0 0 14px;
  font-size: 1rem;
}

.confusable-pair {
  display: grid;
  gap: 12px;
  margin: 0;
}

.confusable-row {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(0, 2.4fr);
  gap: 16px;
  padding-top: 12px;
  border-top: var(--line);
}

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

.confusable-row dt {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-ink);
}

.confusable-row dd {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-ink-soft);
}

.related-entry-section h2 {
  margin: 0;
}

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

.related-entry-card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.related-entry-card h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.related-entry-card p {
  font-size: 0.875rem;
  color: var(--c-ink-soft);
}

.related-entry-card .entry-link {
  align-self: flex-start;
  margin-top: auto;
  min-height: 40px;
  padding: 8px 16px;
  font-size: 0.875rem;
}

.glossary-aside .aside-list {
  gap: 12px;
}

.glossary-aside .aside-list > li {
  font-size: 0.875rem;
  color: var(--c-ink-soft);
}

/* --------------------------------------------------------------------------
   12. pages — 404
   -------------------------------------------------------------------------- */
.error-main {
  max-width: var(--w-narrow);
  margin: 0 auto;
  padding: 64px var(--pad-x) 72px;
}

.error-block {
  padding-bottom: 40px;
  border-bottom: var(--line);
}

.error-code {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 0.9375rem;
  letter-spacing: 0.08em;
  color: var(--c-warm);
}

.error-title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.4vw, 2.75rem);
  font-weight: 600;
  line-height: 1.28;
}

.error-text {
  margin: 0 0 24px;
  color: var(--c-ink-soft);
}

.error-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.error-home {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 12px 18px;
  font-size: 0.9375rem;
  color: var(--c-ink);
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, color 0.18s ease;
}

.error-home:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.error-guide {
  padding-top: 40px;
}

.error-guide-title {
  margin: 0 0 8px;
  font-size: 1.25rem;
}

.error-guide-text {
  margin: 0 0 20px;
  color: var(--c-ink-soft);
}

.error-guide-list {
  display: grid;
  gap: 12px;
}

.error-guide-list > li > a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 18px;
  font-size: 0.9375rem;
  color: var(--c-ink);
  background-color: var(--c-white);
  border: var(--line);
  border-radius: var(--radius);
}

.error-guide-list > li > a:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

/* --------------------------------------------------------------------------
   13. responsive
   -------------------------------------------------------------------------- */

/* 1024px 断点 */
@media (max-width: 1024px) {
  .header-inner {
    height: 60px;
  }

  .nav-list > li > a {
    padding: 8px 9px;
    font-size: 0.875rem;
  }

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

  .hero-focus {
    grid-column: 1 / -1;
  }

  .hero-channels {
    padding-left: 0;
    border-left: 0;
    border-top: var(--line);
    padding-top: 24px;
  }

  .hero-latest {
    padding-left: 0;
    border-left: 0;
    border-top: var(--line);
    padding-top: 24px;
  }

  .channel-row {
    grid-template-columns: 44px minmax(100px, 1fr) minmax(200px, 2fr) minmax(160px, 1.4fr) 32px;
    gap: 14px;
  }

  .boundary-grid {
    gap: 32px;
  }

  .page-layout,
  .layout-shell {
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 40px;
  }

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

  .compare-grid {
    grid-template-columns: minmax(0, 1fr) 120px minmax(0, 1fr);
    gap: 18px;
  }
}

/* 760px 断点 */
@media (max-width: 760px) {
  :root {
    --pad-x: 18px;
  }

  body {
    font-size: 15px;
  }

  /* 页头与移动抽屉 */
  .header-inner {
    height: 56px;
  }

  .brand {
    font-size: 1.125rem;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: static;
    flex: 0 0 auto;
  }

  .nav-list {
    display: none;
  }

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

  .mobile-drawer {
    position: fixed;
    inset: 0;
    z-index: 70;
    display: none;
    flex-direction: column;
    padding: 20px var(--pad-x) 32px;
    background-color: var(--c-paper);
    overflow-y: auto;
  }

  .mobile-drawer.is-open {
    display: flex;
  }

  .drawer-close {
    align-self: flex-end;
    width: 44px;
    height: 44px;
    padding: 0;
    font-size: 1.5rem;
    line-height: 1;
    color: var(--c-ink);
    background: none;
    border: 1px solid var(--c-line);
    border-radius: var(--radius);
  }

  .drawer-list {
    display: grid;
    margin-top: 24px;
  }

  .drawer-list > li > a {
    display: flex;
    align-items: center;
    min-height: 52px;
    padding: 0 4px;
    font-size: 1rem;
    color: var(--c-ink);
    border-bottom: var(--line);
  }

  .drawer-list > li > a.is-current {
    color: var(--c-accent);
    font-weight: 600;
  }

  /* 主容器 */
  .home-main,
  .inner-main {
    padding-bottom: 48px;
  }

  .page-header {
    padding: 16px 0 20px;
  }

  .rule {
    margin-bottom: 28px;
  }

  /* 首页首屏 */
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 32px 0 40px;
  }

  .hero-focus {
    grid-column: auto;
  }

  .hero-actions .btn {
    flex: 1 1 140px;
  }

  .hero-channels {
    order: 3;
    padding-top: 20px;
  }

  .hero-latest {
    order: 2;
    padding-top: 20px;
  }

  .channel-filter {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 6px;
  }

  .channel-filter a {
    min-height: 44px;
    padding: 0 16px;
    white-space: nowrap;
  }

  /* 角色分流 */
  .role-split {
    padding: 40px 0;
  }

  .role-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    padding: 18px 0;
  }

  .role-advice {
    display: block;
  }

  .role-advice p {
    margin-bottom: 8px;
  }

  /* 频道索引 */
  .channel-index {
    padding: 40px 0;
  }

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

  .channel-row {
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr) 28px;
    grid-template-areas:
      "no name arrow"
      "desc desc desc"
      "when when when";
    gap: 6px 10px;
    align-items: center;
    padding: 16px 0;
    border-top: var(--line);
  }

  .channel-row:hover {
    transform: none;
    background-color: transparent;
  }

  .ch-no {
    grid-area: no;
  }

  .ch-name {
    grid-area: name;
  }

  .ch-desc {
    grid-area: desc;
  }

  .ch-when {
    grid-area: when;
    font-size: 0.875rem;
  }

  .ch-arrow {
    grid-area: arrow;
    width: 28px;
    height: 28px;
  }

  /* 专题年表片段 */
  .timeline-snippet {
    padding: 40px 0;
  }

  .year-block {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    padding: 22px 0;
  }

  .year-mark {
    font-size: 2.2rem;
  }

  /* 视频卡片 */
  .video-samples {
    padding: 40px 0;
  }

  .card-grid {
    grid-auto-flow: column;
    grid-auto-columns: 78%;
    gap: 16px;
    overflow-x: auto;
    padding-bottom: 8px;
  }

  /* 起步三步 */
  .start-steps {
    padding: 40px 0;
  }

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

  /* 页面识别 */
  .verify-cols {
    padding: 40px 0;
  }

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

  /* 边界与反馈 */
  .boundary-feedback {
    padding: 40px 0;
  }

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

  .feedback-col {
    padding: 22px;
  }

  /* 常见问题 */
  .faq-section {
    padding: 40px 0 0;
  }

  /* 内页栏式布局 */
  .page-layout,
  .layout-shell,
  .glossary-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .page-aside,
  .content-aside {
    padding: 20px;
  }

  /* 初访路径 */
  .path-map,
  .steps-section,
  .signal-summary {
    margin-bottom: 32px;
  }

  .step-block {
    padding: 20px;
  }

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

  .step-cell {
    padding-top: 12px;
    border-top: var(--line);
  }

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

  .signal-summary .data-table th,
  .signal-summary .data-table td {
    padding: 10px 12px;
  }

  /* 题材频道 */
  .page-intro {
    margin-bottom: 28px;
  }

  .channel-table-section,
  .channel-visual-section,
  .channel-signal-section {
    margin-bottom: 32px;
  }

  .channel-table-wrap {
    overflow-x: visible;
    border: 0;
    background-color: transparent;
  }

  .channel-table {
    min-width: 0;
    display: block;
    background-color: transparent;
  }

  .channel-table thead {
    display: none;
  }

  .channel-table tbody,
  .channel-table tr,
  .channel-table td {
    display: block;
  }

  .channel-table tr {
    margin-bottom: 16px;
    padding: 16px 18px;
    background-color: var(--c-white);
    border: var(--line);
    border-radius: var(--radius);
  }

  .channel-table td {
    padding: 0 0 8px;
    border-bottom: 0;
  }

  .channel-table td:last-child {
    padding-bottom: 0;
  }

  .channel-table td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    color: var(--c-ink-soft);
  }

  .channel-table .channel-enter a {
    margin-top: 6px;
  }

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

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

  /* 专题年表 */
  .timeline-intro {
    margin-bottom: 28px;
  }

  .timeline-section {
    margin-bottom: 32px;
  }

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

  .year-badge {
    display: flex;
    align-items: baseline;
    gap: 12px;
  }

  .year-num {
    font-size: 2.2rem;
  }

  .diff-table {
    display: block;
  }

  .diff-table thead {
    display: none;
  }

  .diff-table tbody,
  .diff-table tr {
    display: block;
  }

  .diff-table tr {
    margin-bottom: 14px;
    padding: 14px 16px;
    background-color: var(--c-white);
    border: var(--line);
    border-radius: var(--radius);
  }

  .diff-table th,
  .diff-table td {
    display: block;
    padding: 0 0 8px;
    border-bottom: 0;
  }

  .diff-table td:last-child {
    padding-bottom: 0;
  }

  .diff-table th {
    font-size: 0.9375rem;
  }

  /* 片单对读 */
  .compare-stage,
  .compare-dimensions,
  .compare-limit,
  .compare-options {
    margin-bottom: 32px;
  }

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

  .compare-axis {
    display: none;
  }

  .dimension-table thead {
    display: none;
  }

  .dimension-table,
  .dimension-table tbody,
  .dimension-table tr,
  .dimension-table th,
  .dimension-table td {
    display: block;
  }

  .dimension-table {
    border: 0;
    background-color: transparent;
  }

  .dimension-table tr {
    margin-bottom: 14px;
    padding: 14px 16px;
    background-color: var(--c-white);
    border: var(--line);
    border-radius: var(--radius);
  }

  .dimension-table th,
  .dimension-table td {
    padding: 0 0 8px;
    border-bottom: 0;
  }

  .dimension-table th {
    font-size: 0.9375rem;
  }

  .dimension-table td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    color: var(--c-ink-soft);
  }

  .option-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .option-item {
    padding: 16px;
  }

  .next-links {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  /* 页面识别 */
  .verify-checks,
  .verify-figure,
  .verify-misjudge,
  .verify-next {
    margin-bottom: 32px;
  }

  .check-block {
    padding: 20px;
  }

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

  .check-anti {
    padding-left: 0;
    padding-top: 14px;
    border-left: 0;
    border-top: var(--line);
  }

  .misjudge-table,
  .misjudge-table tbody,
  .misjudge-table tr,
  .misjudge-table th,
  .misjudge-table td {
    display: block;
  }

  .misjudge-table {
    border: 0;
    background-color: transparent;
  }

  .misjudge-table thead {
    display: none;
  }

  .misjudge-table tr {
    margin-bottom: 14px;
    padding: 14px 16px;
    background-color: var(--c-white);
    border: var(--line);
    border-radius: var(--radius);
  }

  .misjudge-table th,
  .misjudge-table td {
    padding: 0 0 8px;
    border-bottom: 0;
  }

  .misjudge-table td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    color: var(--c-ink-soft);
  }

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

  /* 站内术语 */
  .glossary-table-section,
  .confusable-section {
    margin-bottom: 32px;
  }

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

  .glossary-item {
    padding: 16px 18px;
    border-bottom: var(--line);
  }

  .glossary-item:last-child {
    border-bottom: 0;
  }

  .confusable-group {
    padding: 18px;
  }

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

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

  /* 入口带 */
  .entry-band {
    flex-direction: column;
    align-items: stretch;
    gap: 18px;
    margin-top: 32px;
    padding: 22px;
  }

  .entry-band-links,
  .entry-band-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .btn-entry,
  .entry-link {
    justify-content: center;
  }

  /* 相关内容 */
  .related-links {
    margin-top: 32px;
    gap: 10px 16px;
  }

  /* 页脚 */
  .footer-inner {
    padding: 36px var(--pad-x) 28px;
  }

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

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

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

  .footer-bottom-links {
    gap: 16px;
  }

  /* 404 */
  .error-main {
    padding: 48px var(--pad-x) 56px;
  }

  .error-actions {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }
}

/* 480px 断点 */
@media (max-width: 480px) {
  h2 {
    font-size: 1.3125rem;
  }

  .hero-focus h1,
  .page-title,
  .error-title {
    font-size: 1.75rem;
    line-height: 1.3;
  }

  .hero-lead,
  .page-lead,
  .intro-lead {
    font-size: 0.9375rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    flex: none;
  }

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

  .card-grid {
    grid-auto-columns: 88%;
  }

  .step-detail {
    grid-template-columns: 64px minmax(0, 1fr);
  }

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

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

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

  .related-list > li {
    flex-direction: column;
    gap: 4px;
  }
}

/* 动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}