/* ============================================================
   base：变量、重置、字体、通用元素
   ============================================================ */
:root {
  --color-accent: #b3341f;
  --color-accent-dark: #8f2817;
  --color-ink: #1c1a17;
  --color-paper: #f7f3ec;
  --color-surface: #ffffff;
  --color-text: #5c554d;
  --color-muted: #8a8177;
  --color-line: #dcd3c6;
  --color-line-soft: #e8e1d6;
  --color-tint: #f2ece2;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --container: 1160px;
  --gutter: 24px;
  --font-base: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
  --shadow-soft: 0 1px 2px rgba(28, 26, 23, 0.06);
}

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

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

body {
  margin: 0;
  background-color: var(--color-paper);
  color: var(--color-text);
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--color-ink);
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1.35;
}

p {
  margin: 0 0 1em;
}

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

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

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

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

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

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 0;
}

figure {
  margin: 0;
}

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

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

time {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
}

strong {
  color: var(--color-ink);
  font-weight: 700;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 200;
  padding: 10px 18px;
  background-color: var(--color-ink);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top 0.18s ease;
}

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

/* ============================================================
   layout：页面骨架、页头、导航、页脚、容器
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-paper);
  color: var(--color-text);
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.75;
}

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 68px;
}

.brand {
  flex: 0 0 auto;
  color: var(--color-ink);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.3;
  white-space: nowrap;
}

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

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

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2px;
}

.nav-list li {
  flex: 0 0 auto;
}

.nav-list a {
  display: block;
  padding: 8px 11px;
  color: var(--color-ink);
  font-size: 15px;
  line-height: 1.5;
  border-radius: var(--radius-sm);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  background-color: var(--color-tint);
  color: var(--color-accent);
}

.nav-list a.is-current {
  color: var(--color-accent);
  font-weight: 700;
  background-color: var(--color-tint);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-ink);
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 主内容 */
.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  width: 100%;
  padding-bottom: 56px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* 面包屑 */
.breadcrumb {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--gutter) 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-muted);
}

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

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

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-line);
}

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

/* 页标题区 */
.page-header {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gutter) 22px;
}

.page-title {
  color: var(--color-ink);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0;
}

/* 页脚 */
.site-footer {
  flex: 0 0 auto;
  margin-top: auto;
  background-color: var(--color-ink);
  color: #cfc7bc;
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px var(--gutter) 24px;
}

.footer-brand {
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-logo {
  margin: 0 0 8px;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.footer-note {
  margin: 0;
  max-width: 640px;
  color: #a89e92;
  font-size: 14px;
  line-height: 1.75;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  padding: 26px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-col-title {
  margin: 0 0 12px;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.5;
}

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

.footer-col a {
  color: #b8afa3;
  font-size: 14px;
  line-height: 1.6;
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: #fff;
}

.footer-meta {
  margin: 0;
  padding: 18px 0;
  color: #968c80;
  font-size: 13px;
  line-height: 1.7;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.footer-bottom {
  padding-top: 18px;
}

.footer-bottom p {
  margin: 0;
  color: #8b8175;
  font-size: 13px;
  line-height: 1.7;
}

/* ============================================================
   components：表格、按钮、步骤、标签、note、aside 等通用件
   ============================================================ */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.data-table {
  width: 100%;
  min-width: 560px;
  font-size: 15px;
  line-height: 1.65;
}

.data-table caption {
  text-align: left;
}

.data-table thead th {
  padding: 12px 14px;
  background-color: var(--color-tint);
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 700;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--color-line);
}

.data-table tbody td {
  padding: 13px 14px;
  color: var(--color-text);
  vertical-align: top;
  border-bottom: 1px solid var(--color-line-soft);
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr:hover {
  background-color: #fbf8f2;
}

.data-table tbody td:first-child {
  color: var(--color-ink);
  font-weight: 700;
}

.table-caption {
  padding: 12px 14px;
  color: var(--color-muted);
  font-size: 13px;
  text-align: left;
  border-bottom: 1px solid var(--color-line-soft);
}

.table-note {
  margin: 12px 0 0;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.7;
}

.btn-primary {
  display: inline-block;
  padding: 10px 22px;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  border-radius: var(--radius-sm);
}

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

/* 边界提示框 */
.boundary-box {
  padding-left: 16px;
  border-left: 3px solid var(--color-accent);
}

/* 步骤条（首页与指引页共用结构，作用域分开） */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.step-item {
  position: relative;
  padding: 16px 18px 16px 60px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.step-num {
  position: absolute;
  left: 16px;
  top: 16px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
}

/* 通用 note 列表 */
.note-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.note-item {
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.note-item h3 {
  margin: 0 0 8px;
  color: var(--color-ink);
  font-size: 17px;
  line-height: 1.5;
}

.note-item p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.75;
}

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

.note-boundary {
  padding-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
  border-top: 1px dashed var(--color-line);
}

/* 相关入口 */
.related-entry {
  padding-top: 8px;
}

.entry-list,
.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.entry-list a,
.related-list a {
  display: block;
  padding: 14px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  font-size: 15px;
  line-height: 1.6;
}

.entry-list a:hover,
.entry-list a:focus-visible,
.related-list a:hover,
.related-list a:focus-visible {
  background-color: var(--color-tint);
  color: var(--color-accent);
}

/* 图片容器通用约束 */
.media-figure,
.channels-figure,
.guide-figure,
.archive-figure,
.hero-figure,
.headline-figure,
.headline-media,
.topic-figure,
.note-media {
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-line);
  background-color: var(--color-tint);
}

.media-figure img,
.channels-figure img,
.guide-figure img,
.archive-figure img,
.hero-figure img,
.headline-figure img,
.headline-media img,
.topic-figure img,
.note-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================================================
   pages：首页
   ============================================================ */
.home-main {
  width: 100%;
}

/* 首屏焦点区 */
.hero {
  border-bottom: 1px solid var(--color-line);
  background-color: var(--color-surface);
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 40px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px var(--gutter) 44px;
}

.hero-lead {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.hero-kicker {
  margin: 0 0 12px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.6;
}

.hero-lead h1 {
  margin: 0 0 16px;
  color: var(--color-ink);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.28;
}

.hero-intro {
  margin: 0 0 22px;
  max-width: 620px;
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.8;
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.channel-tags a {
  display: block;
  padding: 7px 14px;
  background-color: var(--color-tint);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  font-size: 14px;
  line-height: 1.5;
}

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

.hero-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.hero-figure {
  margin: 0;
  aspect-ratio: 16 / 10;
}

.continue-browse {
  padding: 16px 18px;
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.continue-title {
  margin: 0 0 10px;
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.continue-list {
  counter-reset: continue;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.continue-list li {
  counter-increment: continue;
  position: relative;
  padding-left: 26px;
  font-size: 14px;
  line-height: 1.65;
}

.continue-list li::before {
  content: counter(continue);
  position: absolute;
  left: 0;
  top: 3px;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-ink);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 11px;
  border-radius: 50%;
}

.continue-list a {
  color: var(--color-ink);
}

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

/* 通用 section */
.section {
  padding: 44px 0;
  border-bottom: 1px solid var(--color-line);
}

.section-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section-head {
  margin-bottom: 22px;
}

.section-head h2 {
  margin: 0 0 8px;
  color: var(--color-ink);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
}

.section-desc {
  margin: 0;
  max-width: 760px;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.75;
}

.section-note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
}

.section-note a {
  color: var(--color-accent);
  font-weight: 700;
}

/* 频道差异对照表 */
.channel-table {
  min-width: 620px;
}

/* 近期头条与最新更新 */
.news-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 36px;
  align-items: start;
}

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

.headline-card {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--color-line);
}

.headline-card:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.headline-figure {
  margin: 0;
  aspect-ratio: 4 / 3;
}

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

.headline-meta {
  margin: 0 0 6px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.6;
}

.headline-body h3 {
  margin: 0 0 8px;
  color: var(--color-ink);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
}

.headline-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

.news-aside {
  min-width: 0;
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.news-aside h2 {
  margin: 0 0 14px;
  color: var(--color-ink);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

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

.update-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  padding: 10px 0;
  border-top: 1px solid var(--color-line-soft);
  font-size: 14px;
  line-height: 1.65;
}

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

.update-list a {
  color: var(--color-ink);
}

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

/* 专题片单条 */
.topic-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.topic-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.topic-figure {
  margin: 0;
  border: 0;
  border-radius: 0;
  aspect-ratio: 16 / 10;
  border-bottom: 1px solid var(--color-line);
}

.topic-card h3 {
  margin: 0;
  padding: 14px 16px 6px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
}

.topic-card h3 a {
  color: inherit;
}

.topic-card h3 a:hover,
.topic-card h3 a:focus-visible {
  color: var(--color-accent);
}

.topic-card p {
  margin: 0;
  padding: 0 16px 16px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.7;
}

/* 观看准备与入口核验 */
.guide-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.72fr);
  gap: 32px;
  align-items: start;
}

.guide-grid .step-list {
  min-width: 0;
}

.guide-grid .step-item {
  min-width: 0;
}

.guide-grid .step-action {
  margin: 0 0 6px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.guide-grid .step-criteria {
  margin: 0;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.7;
}

.guide-figure {
  margin: 0;
  aspect-ratio: 4 / 3;
}

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

/* 按月批次归档条 */
.archive-strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}

.archive-chip {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 14px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
}

.archive-chip:hover,
.archive-chip:focus-visible {
  background-color: var(--color-tint);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.archive-month {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.archive-range {
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.5;
}

.section-archive .archive-figure {
  margin-top: 20px;
  aspect-ratio: 21 / 6;
}

/* 反馈与内容边界 */
.feedback-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  align-items: start;
}

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

.feedback-col h2 {
  margin: 0 0 10px;
  color: var(--color-ink);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
}

.feedback-col p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
}

.feedback-col p:last-child {
  margin-bottom: 0;
}

/* ============================================================
   pages：内页通用
   ============================================================ */
.page-lead {
  margin: 0 0 10px;
  max-width: 820px;
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.8;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.6;
}

.meta-item {
  position: relative;
  padding-right: 18px;
}

.meta-item:last-child {
  padding-right: 0;
}

.meta-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: 1px;
  height: 12px;
  margin-top: -6px;
  background-color: var(--color-line);
}

.page-title,
.page-title-block {
  border-bottom: 1px solid var(--color-line);
}

.page-title-block {
  background-color: var(--color-tint);
}

.page-title-block .container {
  padding-top: 16px;
  padding-bottom: 22px;
}

.page-title-block .page-lead {
  margin-bottom: 8px;
}

/* 页头下方的浅色导语区（部分内页） */
.page-title {
  padding-bottom: 18px;
}

.page-hero {
  background-color: var(--color-tint);
  border-bottom: 1px solid var(--color-line);
}

.page-hero-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px var(--gutter) 22px;
}

.page-hero-lead {
  margin: 0 0 10px;
  max-width: 820px;
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.8;
}

.page-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 0;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.6;
}

/* 内页通用 section 间距 */
.inner-main .section {
  padding: 36px 0;
}

.inner-main .section:last-child {
  border-bottom: 0;
}

.section-title {
  margin: 0 0 10px;
  color: var(--color-ink);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
}

.section-intro,
.section-lead {
  margin: 0 0 20px;
  max-width: 820px;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.8;
}

/* 内页两栏布局：主内容在前，aside 在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 36px;
  align-items: start;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 36px var(--gutter) 0;
}

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

.side-column,
.content-aside,
.topics-aside,
.page-aside {
  min-width: 0;
}

/* ============================================================
   pages：头条 headlines
   ============================================================ */
.headline-stream {
  min-width: 0;
}

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

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

.headline-item--featured {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding-bottom: 22px;
}

.headline-media {
  margin: 0;
  aspect-ratio: 16 / 9;
}

.headline-item .headline-body {
  min-width: 0;
}

.headline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin: 0 0 8px;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.6;
}

.headline-channel {
  color: var(--color-ink);
  font-weight: 700;
}

.headline-badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 2px;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.7;
  border: 1px solid var(--color-line);
  color: var(--color-muted);
  background-color: var(--color-tint);
}

.headline-badge--new {
  color: var(--color-accent);
  border-color: rgba(179, 52, 31, 0.35);
  background-color: rgba(179, 52, 31, 0.08);
}

.headline-badge--adjust {
  color: #7a5a1f;
  border-color: #e0cfab;
  background-color: #faf3e4;
}

.headline-badge--supplement {
  color: #2f5b46;
  border-color: #c3d9cc;
  background-color: #eef5f0;
}

.headline-title {
  margin: 0 0 6px;
  color: var(--color-ink);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
}

.headline-summary {
  margin: 0 0 6px;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.75;
}

.headline-batch {
  margin: 0;
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.6;
}

.change-notes {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--color-line);
}

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

.change-col {
  min-width: 0;
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.change-col-title {
  margin: 0 0 10px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

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

.change-list li {
  position: relative;
  padding-left: 16px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.7;
}

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

/* 头条侧栏 */
.side-block {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.side-block + .side-block {
  margin-top: 20px;
}

.side-title {
  margin: 0 0 12px;
  color: var(--color-ink);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.criteria-list {
  counter-reset: criteria;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.criteria-list li {
  counter-increment: criteria;
  min-width: 0;
}

.criteria-item-title {
  position: relative;
  margin: 0 0 4px;
  padding-left: 26px;
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.criteria-item-title::before {
  content: counter(criteria);
  position: absolute;
  left: 0;
  top: 2px;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-tint);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  border-radius: 50%;
}

.criteria-list p {
  margin: 0;
  padding-left: 26px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.7;
}

.side-block--note {
  background-color: var(--color-tint);
}

.side-block--note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
}

/* ============================================================
   pages：频道 channels
   ============================================================ */
.channels-table-section .channels-figure {
  margin: 0 0 20px;
  aspect-ratio: 21 / 7;
}

.channel-compare {
  min-width: 720px;
}

.channel-naming .note-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

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

.question-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 32px;
}

.question-col {
  min-width: 0;
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.question-col h3 {
  margin: 0 0 6px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.question-col p {
  margin: 0 0 16px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
}

.question-col p:last-child {
  margin-bottom: 0;
}

/* ============================================================
   pages：专题 topics
   ============================================================ */
.topics-layout {
  grid-template-columns: minmax(0, 1fr) 320px;
}

.topics-layout .topics-main {
  min-width: 0;
}

.topics-main .topic-card {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 0;
  margin-bottom: 18px;
}

.topics-main .topic-card:last-child {
  margin-bottom: 0;
}

.topics-main .topic-figure {
  border: 0;
  border-right: 1px solid var(--color-line);
  border-radius: 0;
  aspect-ratio: 4 / 3;
  height: 100%;
}

.topic-body {
  min-width: 0;
  padding: 16px 20px 18px;
}

.topic-name {
  margin: 0 0 8px;
  color: var(--color-ink);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
}

.topic-order {
  margin: 0 0 8px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
}

.topic-reason {
  margin: 0 0 10px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
}

.topic-count {
  margin: 0;
  padding-top: 10px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  border-top: 1px dashed var(--color-line);
}

.count-label,
.order-label {
  color: var(--color-muted);
  font-family: var(--font-base);
  font-weight: 400;
}

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

.aside-title {
  margin: 0 0 12px;
  color: var(--color-ink);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.principle-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.principle-item {
  min-width: 0;
  padding-top: 14px;
  border-top: 1px solid var(--color-line-soft);
}

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

.principle-name {
  margin: 0 0 4px;
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.principle-item p {
  margin: 0;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.7;
}

.topic-channel-map {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 36px var(--gutter) 0;
}

/* ============================================================
   pages：深度 deep
   ============================================================ */
.layout-shell {
  grid-template-columns: minmax(0, 1fr) 300px;
}

.content-main .breadcrumb {
  max-width: none;
  padding: 0;
  margin: 0 0 14px;
}

.content-main .page-header {
  max-width: none;
  padding: 0 0 20px;
  margin: 0 0 26px;
  border-bottom: 1px solid var(--color-line);
}

.deep-notes {
  min-width: 0;
}

.note-title {
  margin: 0 0 12px;
  color: var(--color-ink);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
}

.deep-notes .note-item {
  padding: 0;
  margin-bottom: 30px;
  background-color: transparent;
  border: 0;
  border-radius: 0;
}

.deep-notes .note-item:last-child {
  margin-bottom: 0;
}

.note-media {
  margin: 0 0 14px;
  aspect-ratio: 16 / 9;
}

.deep-notes .note-item p {
  font-size: 16px;
  line-height: 1.9;
}

.deep-criteria {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--color-line);
}

.deep-criteria h2 {
  margin: 0 0 12px;
  font-size: 22px;
  line-height: 1.4;
}

.deep-criteria p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
}

.criteria-table {
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.7;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
}

.criteria-table caption {
  padding: 10px 14px;
  color: var(--color-muted);
  font-size: 13px;
  text-align: left;
  border-bottom: 1px solid var(--color-line-soft);
}

.criteria-table thead th {
  padding: 10px 14px;
  background-color: var(--color-tint);
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 700;
  text-align: left;
  border-bottom: 1px solid var(--color-line);
}

.criteria-table tbody td {
  padding: 11px 14px;
  vertical-align: top;
  border-bottom: 1px solid var(--color-line-soft);
}

.criteria-table tbody tr:last-child td {
  border-bottom: 0;
}

.deep-faq {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--color-line);
}

.deep-faq h2 {
  margin: 0 0 16px;
  font-size: 22px;
  line-height: 1.4;
}

.faq-block {
  padding: 16px 0;
  border-top: 1px solid var(--color-line-soft);
}

.faq-block:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.faq-block h3 {
  margin: 0 0 6px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.55;
}

.faq-block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
}

.content-aside {
  padding-top: 4px;
}

.aside-block {
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.aside-block + .aside-block {
  margin-top: 20px;
}

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

.aside-toc li {
  min-width: 0;
}

.aside-toc a {
  display: block;
  padding: 4px 0 4px 12px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.6;
  border-left: 2px solid var(--color-line);
}

.aside-toc a:hover,
.aside-toc a:focus-visible {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
}

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

.aside-links a {
  display: block;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.6;
}

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

/* ============================================================
   pages：时间归档 archive
   ============================================================ */
.archive-index {
  padding-top: 32px;
}

.archive-index .archive-figure {
  margin: 0 0 20px;
  aspect-ratio: 21 / 7;
}

.archive-table {
  min-width: 640px;
}

.archive-fields {
  padding-top: 32px;
  margin-top: 32px;
  border-top: 1px solid var(--color-line);
}

.fields-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.field-card {
  min-width: 0;
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.field-card h3 {
  margin: 0 0 8px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.field-card p {
  margin: 0 0 8px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
}

.field-example {
  padding-top: 8px;
  color: var(--color-muted);
  font-size: 13px;
  border-top: 1px dashed var(--color-line);
}

.archive-link {
  padding-top: 32px;
  margin-top: 32px;
  border-top: 1px solid var(--color-line);
}

.archive-link .link-notes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.archive-hint {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
}

.archive-hint a {
  margin-right: 16px;
  color: var(--color-accent);
  font-weight: 700;
}

/* ============================================================
   pages：观看指引 guide
   ============================================================ */
.guide-check {
  padding-top: 32px;
}

.guide-check .guide-figure {
  margin: 0 0 22px;
  aspect-ratio: 21 / 7;
}

.guide-check .step-list {
  gap: 14px;
}

.guide-check .step-item {
  padding: 18px 20px 18px 64px;
}

.guide-check .step-item .step-num {
  left: 18px;
  top: 18px;
  width: 32px;
  height: 32px;
  margin: 0;
  font-size: 14px;
}

.guide-check .step-title {
  margin: 0 0 6px;
  color: var(--color-ink);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.guide-check .step-action {
  margin: 0 0 6px;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.75;
}

.guide-check .step-rule {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.7;
}

.guide-prep {
  padding-top: 32px;
  margin-top: 32px;
  border-top: 1px solid var(--color-line);
}

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

.prep-col {
  min-width: 0;
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.prep-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.prep-item {
  min-width: 0;
  padding-top: 14px;
  border-top: 1px solid var(--color-line-soft);
}

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

.prep-title {
  margin: 0 0 4px;
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.prep-desc {
  margin: 0;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
}

.guide-faq {
  padding-top: 32px;
  margin-top: 32px;
  border-top: 1px solid var(--color-line);
}

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

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  position: relative;
  padding: 14px 44px 14px 18px;
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  text-align: center;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  line-height: 1;
}

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

.faq-item[open] .faq-question {
  background-color: var(--color-tint);
  border-bottom: 1px solid var(--color-line);
}

.faq-answer {
  padding: 14px 18px 16px;
}

.faq-answer p {
  margin: 0;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.8;
}

/* ============================================================
   pages：意见反馈 feedback
   ============================================================ */
.feedback-layout {
  grid-template-columns: minmax(0, 1fr) 320px;
}

.content-section {
  min-width: 0;
  padding: 0 0 30px;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--color-line);
}

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

.content-section h2 {
  margin: 0 0 10px;
  color: var(--color-ink);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
}

.content-section > p {
  margin: 0 0 16px;
  max-width: 760px;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.8;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.info-card {
  min-width: 0;
  padding: 16px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.info-card h3 {
  margin: 0 0 6px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.info-card p {
  margin: 0 0 8px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
  overflow-wrap: break-word;
}

.info-example {
  padding-top: 8px;
  color: var(--color-muted);
  font-size: 13px;
  border-top: 1px dashed var(--color-line);
}

.feedback-layout .step-list {
  gap: 14px;
}

.feedback-layout .step-item {
  padding: 16px 18px 16px 58px;
}

.feedback-layout .step-item .step-num {
  left: 16px;
  top: 16px;
  width: 28px;
  height: 28px;
  font-size: 13px;
}

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

.step-body h3 {
  margin: 0 0 4px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
}

.step-body p {
  margin: 0;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
}

.feedback-layout .note-list {
  gap: 12px;
}

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

.page-aside h2 {
  margin: 0 0 8px;
  color: var(--color-ink);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.page-aside > p {
  margin: 0 0 14px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
}

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

.link-list a {
  display: block;
  padding: 10px 12px;
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  font-size: 14px;
  line-height: 1.6;
}

.link-list a:hover,
.link-list a:focus-visible {
  background-color: var(--color-tint);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================================
   pages：404
   ============================================================ */
.error-main {
  width: 100%;
}

.error-hero {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px var(--gutter) 40px;
}

.error-code {
  margin: 0 0 10px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
}

.error-main h1 {
  margin: 0 0 14px;
  color: var(--color-ink);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
}

.error-lead {
  margin: 0 0 22px;
  max-width: 640px;
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.8;
}

.error-home {
  display: inline-block;
  padding: 10px 22px;
  background-color: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  border-radius: var(--radius-sm);
}

.error-home:hover,
.error-home:focus-visible {
  background-color: var(--color-accent-dark);
  color: #fff;
}

.error-hints {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter) 72px;
}

.error-hints h2 {
  margin: 0 0 10px;
  color: var(--color-ink);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
}

.error-hints > p {
  margin: 0 0 16px;
  max-width: 680px;
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.8;
}

.error-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.error-list a {
  display: block;
  padding: 14px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-ink);
  font-size: 15px;
  line-height: 1.6;
}

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

.error-tip {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.8;
}

.error-tip a {
  margin-right: 14px;
  color: var(--color-accent);
  font-weight: 700;
}

/* ============================================================
   responsive：1024px
   ============================================================ */
@media (max-width: 1024px) {
  :root {
    --gutter: 20px;
  }

  .header-inner {
    min-height: 62px;
  }

  .nav-list a {
    padding: 8px 8px;
    font-size: 14px;
  }

  .hero-inner {
    gap: 28px;
    padding-top: 32px;
    padding-bottom: 36px;
  }

  .hero-lead h1 {
    font-size: 30px;
  }

  .news-grid {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 26px;
  }

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

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

  .guide-grid .guide-figure {
    aspect-ratio: 21 / 8;
  }

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 28px;
  }

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

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

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

  .topics-main .topic-card {
    grid-template-columns: 220px minmax(0, 1fr);
  }
}

/* ============================================================
   responsive：760px —— 移动导航与单列布局
   ============================================================ */
@media (max-width: 760px) {
  :root {
    --gutter: 16px;
  }

  body {
    font-size: 15px;
  }

  /* 页头与移动导航 */
  .header-inner {
    flex-wrap: wrap;
    min-height: 58px;
    padding-top: 7px;
    padding-bottom: 7px;
    gap: 0;
  }

  .brand {
    font-size: 17px;
    max-width: calc(100% - 62px);
    white-space: normal;
    line-height: 1.35;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 0 0 100%;
    display: block;
    order: 3;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 8px 0 10px;
    border-top: 1px solid var(--color-line);
    margin-top: 7px;
  }

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

  .nav-list li {
    width: 100%;
  }

  .nav-list a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 10px 12px;
    font-size: 15px;
    border-radius: var(--radius-sm);
  }

  /* 页标题 */
  .page-title {
    font-size: 24px;
    padding-bottom: 14px;
  }

  .page-header {
    padding: 14px var(--gutter) 16px;
  }

  .breadcrumb {
    padding-top: 14px;
    font-size: 12px;
  }

  .page-title-block .container,
  .page-hero-inner {
    padding-top: 14px;
    padding-bottom: 18px;
  }

  .page-lead,
  .page-hero-lead,
  .page-intro {
    font-size: 15px;
    line-height: 1.75;
  }

  /* 首页 hero */
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding-top: 26px;
    padding-bottom: 30px;
  }

  .hero-lead h1 {
    font-size: 25px;
    line-height: 1.32;
  }

  .hero-intro {
    margin-bottom: 18px;
    font-size: 15px;
  }

  .channel-tags {
    gap: 8px;
  }

  .channel-tags a {
    padding: 8px 12px;
    font-size: 13px;
    min-height: 38px;
    display: inline-flex;
    align-items: center;
  }

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

  .section {
    padding: 30px 0;
  }

  .section-head {
    margin-bottom: 16px;
  }

  .section-head h2,
  .section-title {
    font-size: 20px;
  }

  .section-desc,
  .section-intro,
  .section-lead {
    font-size: 14px;
    line-height: 1.75;
  }

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

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

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

  .headline-body h3 {
    font-size: 17px;
  }

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

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

  .archive-chip {
    min-height: 44px;
  }

  .section-archive .archive-figure {
    aspect-ratio: 16 / 9;
  }

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

  .feedback-col h2 {
    font-size: 17px;
  }

  /* 内页两栏收单列，主内容在前 */
  .page-layout,
  .topics-layout,
  .layout-shell,
  .feedback-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding-top: 26px;
  }

  .content-main .breadcrumb {
    margin-bottom: 12px;
  }

  .content-main .page-header {
    padding-bottom: 16px;
    margin-bottom: 22px;
  }

  .topic-channel-map {
    padding-top: 28px;
  }

  .channels-table-section .channels-figure,
  .archive-index .archive-figure,
  .guide-check .guide-figure {
    aspect-ratio: 16 / 9;
  }

  .channel-naming .note-list,
  .archive-link .link-notes {
    grid-template-columns: minmax(0, 1fr);
  }

  .question-columns,
  .change-columns,
  .prep-columns,
  .fields-grid,
  .info-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .topics-main .topic-card {
    grid-template-columns: minmax(0, 1fr);
  }

  .topics-main .topic-figure {
    border-right: 0;
    border-bottom: 1px solid var(--color-line);
    aspect-ratio: 16 / 9;
    height: auto;
  }

  .topic-body {
    padding: 14px 16px 16px;
  }

  .topic-name {
    font-size: 17px;
  }

  .note-title {
    font-size: 18px;
  }

  .deep-notes .note-item p,
  .deep-criteria p {
    font-size: 15px;
    line-height: 1.85;
  }

  .deep-criteria h2,
  .deep-faq h2,
  .content-section h2 {
    font-size: 19px;
  }

  .content-section {
    padding-bottom: 24px;
    margin-bottom: 24px;
  }

  .guide-check,
  .archive-index {
    padding-top: 26px;
  }

  .guide-prep,
  .guide-faq,
  .archive-fields,
  .archive-link,
  .deep-criteria,
  .deep-faq {
    padding-top: 26px;
    margin-top: 26px;
  }

  .guide-check .step-item {
    padding: 16px 16px 16px 56px;
  }

  .guide-check .step-item .step-num {
    left: 14px;
    top: 16px;
    width: 28px;
    height: 28px;
    font-size: 13px;
  }

  .step-item {
    padding: 14px 16px 14px 54px;
  }

  .step-num {
    left: 14px;
    top: 14px;
    width: 28px;
    height: 28px;
    font-size: 13px;
  }

  .guide-grid .step-action,
  .guide-check .step-title {
    font-size: 15px;
  }

  .guide-grid .step-criteria,
  .guide-check .step-action,
  .guide-check .step-rule {
    font-size: 13.5px;
  }

  .faq-question {
    padding: 13px 42px 13px 16px;
    font-size: 14.5px;
  }

  .faq-answer {
    padding: 12px 16px 14px;
  }

  .faq-answer p {
    font-size: 14px;
  }

  /* 表格横向滚动，不撑破页面 */
  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

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

  .channel-table,
  .channel-compare,
  .archive-table {
    min-width: 600px;
  }

  .data-table thead th,
  .data-table tbody td {
    padding: 10px 12px;
  }

  /* 页脚 */
  .footer-inner {
    padding: 32px var(--gutter) 20px;
  }

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

  .footer-col a {
    display: inline-flex;
    align-items: center;
    min-height: 32px;
  }

  .footer-logo {
    font-size: 17px;
  }

  .footer-note,
  .footer-col a {
    font-size: 13.5px;
  }

  .error-hero {
    padding: 44px var(--gutter) 30px;
  }

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

  .error-hints {
    padding-bottom: 48px;
  }

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

/* ============================================================
   responsive：480px
   ============================================================ */
@media (max-width: 480px) {
  .hero-lead h1 {
    font-size: 22px;
  }

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

  .section-head h2,
  .section-title {
    font-size: 18px;
  }

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

  .archive-chip {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 10px;
    padding: 12px 14px;
  }

  .footer-nav {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

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

  .btn-primary,
  .error-home {
    display: block;
    width: 100%;
    text-align: center;
    min-height: 44px;
    padding: 11px 18px;
  }

  .headline-body h3 {
    font-size: 16px;
  }

  .topic-card h3 {
    font-size: 15.5px;
  }

  .news-aside {
    padding: 16px;
  }

  .side-block,
  .asides-block,
  .page-aside,
  .topics-aside,
  .aside-block {
    padding: 16px;
  }

  .archive-hint a {
    display: inline-block;
    margin: 0 14px 8px 0;
  }
}

/* ============================================================
   动效增强：遵循减少动效偏好
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}