/* ==========================================================================
   武汉天美传媒 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */

:root {
  --paper: #F7F4EE;
  --ink: #191817;
  --graphite: #6A645A;
  --cinnabar: #C4482F;
  --line: #DED6C8;
  --paper-deep: #F0EBE1;
  --max-width: 1180px;
  --read-width: 68ch;
  --font-serif: "Songti SC", "SimSun", "Noto Serif CJK SC", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
}

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

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
}

p {
  margin: 0;
}

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

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

figure {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 3px;
}

figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--graphite);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  padding: 10px 18px;
  background-color: var(--ink);
  color: var(--paper);
  border-radius: 4px;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
  color: var(--paper);
}

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background-color: var(--paper);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 32px;
}

.brand {
  flex: none;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

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

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 22px;
}

.nav-list li {
  flex: none;
}

.nav-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.nav-num {
  font-family: var(--font-serif);
  font-size: 11px;
  color: var(--graphite);
  letter-spacing: 0.04em;
}

.nav-list a:hover .nav-num,
.nav-list a.is-current .nav-num {
  color: var(--cinnabar);
}

.nav-list a.is-current {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
}

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

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 32px 72px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--graphite);
  margin-bottom: 22px;
}

.breadcrumb a {
  color: var(--graphite);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

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

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

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

.page-title {
  font-size: clamp(2.1rem, 4.4vw, 3.5rem);
  font-weight: 700;
  line-height: 1.22;
  color: var(--ink);
  max-width: 22ch;
}

.page-lead {
  max-width: var(--read-width);
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
}

.page-index,
.page-num {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.page-title-wrap {
  max-width: var(--read-width);
  margin-bottom: 36px;
}

.page-heading .page-lead {
  margin-top: 14px;
}

.section-num {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.section-head {
  max-width: 72ch;
  margin-bottom: 32px;
}

.section-head h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.2rem);
  line-height: 1.3;
}

.section-head p {
  margin-top: 12px;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.8;
}

.section-note,
.section-intro {
  max-width: 72ch;
  margin-bottom: 28px;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.8;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.section-block {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}

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

/* 页脚 */

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  background-color: var(--paper-deep);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr 1fr;
  gap: 40px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 32px 36px;
}

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

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink);
}

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

.footer-desc {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--graphite);
}

.footer-title {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 14px;
}

.footer-nav ul,
.footer-more ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav a,
.footer-more a {
  font-size: 13px;
  color: var(--graphite);
  border-bottom: 1px solid transparent;
}

.footer-nav a:hover,
.footer-more a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.footer-boundary p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--graphite);
}

.footer-bottom {
  border-top: 1px solid var(--line);
  background-color: var(--paper-deep);
}

.footer-bottom p {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 32px;
  font-size: 12px;
  color: var(--graphite);
}

/* --------------------------------------------------------------------------
   components · 通用组件
   -------------------------------------------------------------------------- */

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.text-link::after {
  content: "\2192";
  font-size: 13px;
  transition: transform 0.2s ease;
}

.text-link:hover,
.text-link:focus-visible {
  border-bottom-color: var(--cinnabar);
}

.text-link:hover::after {
  transform: translateX(3px);
}

.section-more {
  margin-top: 28px;
}

/* 图片容器 */

.hero-figure,
.channel-figure,
.precheck-figure,
.guide-figure,
.qa-intro-figure,
.feature-figure,
.record-figure,
.scope-figure {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--paper-deep);
}

.hero-figure img,
.channel-figure img,
.precheck-figure img,
.guide-figure img,
.qa-intro-figure img,
.feature-figure img,
.record-figure img,
.scope-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 标签 */

.label {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-serif);
  font-size: 12px;
  color: var(--graphite);
  letter-spacing: 0.04em;
}

.scope-label {
  display: inline-block;
  margin-right: 6px;
  font-family: var(--font-serif);
  font-size: 12px;
  color: var(--cinnabar);
  letter-spacing: 0.04em;
}

/* 按钮（404） */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 14px;
  border-radius: 4px;
  border: 1px solid var(--ink);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background-color: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background-color: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper);
}

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

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

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

.home-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  padding: 56px 0 72px;
  border-bottom: 1px solid var(--line);
}

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

.hero-figure {
  aspect-ratio: 4 / 3;
}

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

.eyebrow {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.hero-text h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.5rem);
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero-lead {
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
  margin-bottom: 28px;
}

.hero-entries {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.hero-entries li {
  min-width: 0;
}

.hero-entries a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 52px;
  padding: 12px 18px;
  font-size: 14px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  background-color: transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.hero-entries a::after {
  content: "\2192";
  font-size: 13px;
  color: var(--graphite);
  transition: transform 0.2s ease, color 0.2s ease;
}

.hero-entries a:hover,
.hero-entries a:focus-visible {
  color: var(--cinnabar);
  border-color: var(--cinnabar);
}

.hero-entries a:hover::after {
  color: var(--cinnabar);
  transform: translateX(3px);
}

/* 频道交错媒体 */

.channel-overview {
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
}

.channel-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  padding: 40px 0;
  border-top: 1px solid var(--line);
}

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

.channel-block.media-right .channel-text {
  order: 1;
}

.channel-block.media-right .channel-figure {
  order: 2;
}

.channel-block.media-left .channel-text {
  order: 2;
}

.channel-block.media-left .channel-figure {
  order: 1;
}

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

.channel-index {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.channel-text h3 {
  font-size: 1.35rem;
  margin-bottom: 14px;
}

.channel-text p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
  margin-bottom: 12px;
}

.channel-text .channel-scene {
  color: var(--ink);
}

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

.channel-figure {
  aspect-ratio: 4 / 3;
}

/* 主题索引速览 */

.topic-glance {
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
}

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

.topic-item {
  min-width: 0;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: transparent;
  display: flex;
  flex-direction: column;
}

.topic-letter {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--cinnabar);
  line-height: 1.1;
  margin-bottom: 12px;
}

.topic-item h3 {
  font-size: 1.15rem;
  margin-bottom: 14px;
}

.topic-entries {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
  flex: 1 1 auto;
}

.topic-entries li {
  font-size: 14px;
  color: var(--graphite);
  padding-left: 14px;
  position: relative;
}

.topic-entries li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 6px;
  height: 1px;
  background-color: var(--line);
}

/* 专题片单摘要 */

.feature-summary {
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
}

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

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

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

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

.feature-body h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.feature-summary .feature-body p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
  margin-bottom: 8px;
  max-width: var(--read-width);
}

.feature-summary .feature-body .feature-order {
  font-family: var(--font-serif);
  color: var(--ink);
}

.feature-summary .feature-body .feature-channel {
  font-size: 13px;
  color: var(--graphite);
}

.feature-item > .text-link {
  align-self: center;
  white-space: nowrap;
}

/* 观看前确认 */

.precheck {
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
}

.precheck-body {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

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

.precheck-step {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: transparent;
}

.precheck-step h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.precheck-step h3::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--cinnabar);
  border-radius: 50%;
  flex: none;
  transform: translateY(-2px);
}

.precheck-step p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 8px;
}

.precheck-step .precheck-check {
  font-size: 13px;
  color: var(--ink);
  padding-top: 8px;
  border-top: 1px dashed var(--line);
}

.precheck-figure {
  aspect-ratio: 4 / 3;
  min-width: 0;
}

/* 维护说明预览 */

.maintenance-preview {
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
}

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

.maintenance-item {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  min-width: 0;
}

.maintenance-item h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.maintenance-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 10px;
}

.maintenance-status {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  color: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  border-radius: 3px;
}

/* 合作与反馈入口 */

.feedback-entry {
  padding: 72px 0;
}

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

.feedback-col {
  min-width: 0;
  padding: 26px 26px 28px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.feedback-col h3 {
  font-size: 1.15rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

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

.feedback-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.feedback-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background-color: var(--cinnabar);
}

/* --------------------------------------------------------------------------
   pages · 频道与栏目
   -------------------------------------------------------------------------- */

.page-hero {
  max-width: var(--read-width);
  margin-bottom: 40px;
}

.channel-anchor {
  margin-bottom: 56px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.anchor-title {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--graphite);
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.anchor-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.anchor-list a {
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.anchor-list a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.channel-section {
  margin-bottom: 56px;
}

.channel-section h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.2rem);
  margin-bottom: 12px;
}

.channel-section .section-note {
  margin-bottom: 32px;
}

.channel-section .channel-block {
  padding: 40px 0;
  border-top: 1px solid var(--line);
}

.channel-section .channel-block:first-of-type {
  border-top: 1px solid var(--line);
  padding-top: 40px;
}

.channel-num {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.channel-name {
  font-size: 1.35rem;
  margin-bottom: 16px;
}

.channel-scope,
.channel-scene,
.channel-prereq,
.channel-feature {
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
  margin-bottom: 12px;
}

.channel-text .channel-scene {
  color: var(--ink);
}

.channel-feature a {
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
}

.channel-feature a:hover {
  border-bottom-color: var(--cinnabar);
}

.channel-links {
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.channel-links h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.2rem);
  margin-bottom: 12px;
}

.link-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
  margin-top: 28px;
}

.link-col {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.link-col-title {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.link-col p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 14px;
}

/* --------------------------------------------------------------------------
   pages · 主题索引
   -------------------------------------------------------------------------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 56px;
  align-items: start;
}

.page-layout.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

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

.topics-aside {
  min-width: 0;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--paper-deep);
  position: sticky;
  top: 24px;
}

.aside-block {
  margin-bottom: 24px;
}

.aside-block:last-child {
  margin-bottom: 0;
}

.aside-title {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--graphite);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.index-anchor-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.index-anchor-list a {
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.index-anchor-list a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.aside-note p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--graphite);
  margin-bottom: 12px;
}

.aside-back {
  display: inline-block;
  font-size: 13px;
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
}

.aside-back:hover {
  border-bottom-color: var(--cinnabar);
}

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

.topics-main .breadcrumb {
  margin-bottom: 18px;
}

.index-guide {
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.index-guide h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.2rem);
  margin-bottom: 20px;
}

.guide-figure {
  aspect-ratio: 16 / 9;
  margin-bottom: 20px;
}

.index-guide p {
  max-width: var(--read-width);
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
}

.topic-group {
  padding: 36px 0;
  border-top: 1px solid var(--line);
}

.topic-group:first-of-type {
  border-top: 0;
  padding-top: 0;
}

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

.group-letter {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.group-header h2 {
  font-size: 1.55rem;
  margin-bottom: 10px;
}

.group-scope {
  max-width: var(--read-width);
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

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

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

.topic-entry:first-child {
  border-top: 0;
  padding-top: 0;
}

.topic-entry h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.entry-meta {
  font-size: 13px;
  color: var(--graphite);
  margin-bottom: 8px;
}

.entry-meta a,
.entry-desc a {
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
}

.entry-meta a:hover,
.entry-desc a:hover {
  border-bottom-color: var(--cinnabar);
}

.entry-desc {
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
  max-width: var(--read-width);
}

.entry-guide {
  margin-top: 48px;
  padding: 32px 28px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--paper-deep);
}

.entry-guide h2 {
  font-size: 1.35rem;
  margin-bottom: 14px;
}

.entry-guide > p {
  font-size: 14px;
  line-height: 1.85;
  color: var(--graphite);
  margin-bottom: 18px;
  max-width: var(--read-width);
}

.entry-guide > p a {
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
}

.entry-guide > p a:hover {
  border-bottom-color: var(--cinnabar);
}

.entry-guide-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
}

.entry-guide-list a {
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.entry-guide-list a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* --------------------------------------------------------------------------
   pages · 专题片单
   -------------------------------------------------------------------------- */

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

.method-item {
  min-width: 0;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.method-index {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.method-item h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.method-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.feature-article {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr) minmax(0, 0.9fr);
  gap: 40px;
  align-items: start;
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.feature-article:first-of-type {
  border-top: 0;
  padding-top: 0;
}

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

.feature-num {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cinnabar);
  line-height: 1.1;
  margin-bottom: 18px;
}

.feature-fields {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
}

.feature-fields dt {
  font-size: 12px;
  color: var(--graphite);
  letter-spacing: 0.04em;
  margin-top: 8px;
}

.feature-fields dd {
  margin: 0 0 4px;
  font-size: 14px;
  color: var(--ink);
  line-height: 1.7;
}

.feature-fields dd a {
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
}

.feature-fields dd a:hover {
  border-bottom-color: var(--cinnabar);
}

.feature-article .feature-body h3 {
  font-size: 1.35rem;
  margin-bottom: 14px;
}

.feature-article .feature-summary {
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
  margin-bottom: 18px;
  max-width: var(--read-width);
}

.feature-article .feature-order {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--paper-deep);
  margin-bottom: 16px;
}

.feature-article .feature-order h4 {
  font-family: var(--font-serif);
  font-size: 14px;
  margin-bottom: 10px;
  color: var(--ink);
}

.feature-article .feature-order ol {
  list-style: decimal;
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.feature-article .feature-order li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.feature-article .feature-note {
  font-size: 13px;
  line-height: 1.75;
  color: var(--graphite);
}

.feature-article .feature-figure {
  aspect-ratio: 4 / 3;
  min-width: 0;
}

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

.viewing-bar-item {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.viewing-bar-item h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.viewing-bar-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 14px;
}

.viewing-bar-item a {
  font-size: 14px;
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
}

.viewing-bar-item a:hover {
  border-bottom-color: var(--cinnabar);
}

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

.related-item {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.related-item h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.related-item h3 a {
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.related-item h3 a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.related-item p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.related-more {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.related-more a {
  font-size: 14px;
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
}

.related-more a:hover {
  border-bottom-color: var(--cinnabar);
}

/* --------------------------------------------------------------------------
   pages · 观看说明
   -------------------------------------------------------------------------- */

.page-head {
  padding-top: 28px;
}

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

.qa-intro {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--line);
}

.qa-intro h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.2rem);
  margin-bottom: 20px;
}

.qa-intro-figure {
  aspect-ratio: 16 / 9;
  margin-bottom: 20px;
}

.qa-intro p {
  max-width: var(--read-width);
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
}

.qa-group {
  padding: 32px 0;
  border-top: 1px solid var(--line);
}

.qa-group:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.qa-group h2 {
  font-size: 1.35rem;
  margin-bottom: 10px;
}

.qa-group-desc {
  max-width: var(--read-width);
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 18px;
}

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

.qa-item:first-of-type {
  border-top: 1px solid var(--line);
}

.qa-item summary {
  position: relative;
  padding: 16px 40px 16px 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  line-height: 1.5;
}

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

.qa-item summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  color: var(--graphite);
  transition: color 0.2s ease;
}

.qa-item[open] summary::after {
  content: "\2212";
  color: var(--cinnabar);
}

.qa-item summary:hover {
  color: var(--cinnabar);
}

.qa-body {
  padding: 0 0 18px;
}

.qa-body p {
  max-width: var(--read-width);
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
}

.content-aside {
  min-width: 0;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--paper-deep);
  position: sticky;
  top: 24px;
}

.aside-toc ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aside-toc a {
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px solid transparent;
}

.aside-toc a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.content-aside .aside-note {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.content-aside .aside-note h3 {
  font-size: 14px;
  margin-bottom: 10px;
}

.content-aside .aside-note p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--graphite);
}

.aside-links {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.aside-links h3 {
  font-size: 14px;
  margin-bottom: 12px;
}

.aside-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aside-links a {
  font-size: 13px;
  color: var(--graphite);
  border-bottom: 1px solid transparent;
}

.aside-links a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* --------------------------------------------------------------------------
   pages · 维护说明
   -------------------------------------------------------------------------- */

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

.scope-item {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.scope-num {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.scope-item h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.scope-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 12px;
}

.scope-trigger {
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink);
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.record-figure {
  aspect-ratio: 16 / 9;
  margin-bottom: 28px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: transparent;
}

.field-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 640px;
}

.field-table caption {
  padding: 14px 18px;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--graphite);
  border-bottom: 1px solid var(--line);
}

.field-table thead th {
  padding: 14px 18px;
  text-align: left;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--ink);
  background-color: var(--paper-deep);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.field-table tbody th {
  padding: 14px 18px;
  text-align: left;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.field-table tbody td {
  padding: 14px 18px;
  color: var(--graphite);
  line-height: 1.7;
  border-bottom: 1px solid var(--line);
}

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

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

.flow-list .flow-step {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.flow-num {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--cinnabar);
  line-height: 1.1;
  margin-bottom: 12px;
}

.flow-list .flow-step h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.flow-list .flow-step p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 10px;
}

.flow-list .flow-step .flow-duty {
  font-size: 13px;
  color: var(--ink);
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.status-legend {
  margin-top: 32px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background-color: var(--paper-deep);
}

.status-legend h3 {
  font-size: 1.05rem;
  margin-bottom: 14px;
}

.status-legend dl {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 10px 20px;
}

.status-legend dt {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}

.status-legend dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
}

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

.related-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  transition: border-color 0.2s ease;
}

.related-card:hover {
  border-color: var(--cinnabar);
}

.related-tag {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
}

.related-card:hover .related-tag {
  color: var(--cinnabar);
}

.related-desc {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

/* --------------------------------------------------------------------------
   pages · 合作与反馈
   -------------------------------------------------------------------------- */

.scope-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  margin-bottom: 40px;
}

.scope-col {
  min-width: 0;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.scope-col h3 {
  font-size: 1.15rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.scope-col ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.scope-col li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.scope-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 8px;
  height: 1px;
  background-color: var(--line);
}

.scope-col strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
}

.scope-accept {
  border-left: 3px solid var(--cinnabar);
}

.scope-reject {
  border-left: 3px solid var(--line);
}

.scope-accept li::before {
  background-color: var(--cinnabar);
}

.scope-figure {
  aspect-ratio: 21 / 9;
  margin-bottom: 48px;
}

.prepare-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-bottom: 48px;
  padding: 0;
}

.prepare-list li {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.prepare-num {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.prepare-list h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.prepare-list p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.flow-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-bottom: 48px;
}

.feedback-flow .flow-step {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.flow-step-num {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--cinnabar);
  line-height: 1.1;
  margin-bottom: 12px;
}

.feedback-flow .flow-step h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.feedback-flow .flow-step p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

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

.related-col {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.related-col h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.related-col p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
  margin-bottom: 14px;
}

.related-col a {
  font-size: 14px;
  color: var(--cinnabar);
  border-bottom: 1px solid transparent;
}

.related-col a:hover {
  border-bottom-color: var(--cinnabar);
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */

.error-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 32px 80px;
}

.error-hero {
  padding: 40px 0 56px;
  border-bottom: 1px solid var(--line);
}

.error-code {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--cinnabar);
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}

.error-hero h1 {
  font-size: clamp(2.1rem, 4.4vw, 3.5rem);
  line-height: 1.2;
  margin-bottom: 18px;
  max-width: 20ch;
}

.error-lead {
  max-width: var(--read-width);
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
  margin-bottom: 28px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.error-paths {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

.error-paths h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.2rem);
  margin-bottom: 24px;
}

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

.error-path-list li {
  min-width: 0;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.error-path-list a {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
  border-bottom: 1px solid transparent;
  margin-bottom: 8px;
}

.error-path-list a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

.error-path-list p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.error-note {
  padding: 40px 0 0;
}

.error-note h2 {
  font-size: 1.35rem;
  margin-bottom: 14px;
}

.error-note p {
  max-width: var(--read-width);
  font-size: 15px;
  line-height: 1.85;
  color: var(--graphite);
}

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

@media (max-width: 1024px) {
  .header-inner {
    padding: 16px 24px;
  }

  .nav-list {
    gap: 16px;
  }

  .nav-list a {
    font-size: 13px;
  }

  .inner-main,
  .home-main,
  .container,
  .error-main {
    padding-left: 24px;
    padding-right: 24px;
  }

  .hero {
    gap: 36px;
    padding: 44px 0 56px;
  }

  .channel-block {
    gap: 32px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: 36px;
  }

  .page-layout.sidebar-left {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .feature-article {
    grid-template-columns: 170px minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 28px;
  }

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

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

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

@media (max-width: 720px) {
  .header-inner {
    position: relative;
    padding: 14px 20px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 30;
    display: block;
    background-color: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 0 20px;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 16px;
  }

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

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

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

  .nav-list a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 12px 0;
    font-size: 15px;
    border-bottom: 0;
  }

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

  .inner-main,
  .home-main,
  .container,
  .error-main {
    padding-left: 20px;
    padding-right: 20px;
  }

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

  .page-title {
    font-size: clamp(1.75rem, 7vw, 2.4rem);
    max-width: none;
  }

  .page-lead {
    font-size: 15px;
  }

  .section-head {
    margin-bottom: 24px;
  }

  .section-block {
    padding: 40px 0;
  }

  /* 首页移动排序 */
  .hero {
    display: flex;
    flex-direction: column;
    gap: 28px;
    padding: 32px 0 48px;
    align-items: stretch;
  }

  .hero-text {
    order: 1;
  }

  .hero-media {
    order: 2;
  }

  .hero-text h1 {
    font-size: clamp(1.9rem, 8vw, 2.6rem);
  }

  .hero-lead {
    font-size: 15px;
  }

  .hero-entries {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .hero-entries a {
    min-height: 48px;
    padding: 12px 16px;
  }

  .channel-overview,
  .topic-glance,
  .feature-summary,
  .precheck,
  .maintenance-preview,
  .feedback-entry {
    padding: 48px 0;
  }

  .channel-block {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: stretch;
    padding: 32px 0;
  }

  .channel-block .channel-text,
  .channel-block .channel-figure {
    order: initial;
  }

  .channel-block.media-left .channel-text,
  .channel-block.media-right .channel-text {
    order: 1;
  }

  .channel-block.media-left .channel-figure,
  .channel-block.media-right .channel-figure {
    order: 2;
  }

  .channel-section .channel-block {
    padding: 32px 0;
  }

  .channel-section .channel-block:first-of-type {
    padding-top: 32px;
  }

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

  .feature-item {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 24px 0;
  }

  .feature-item > .text-link {
    align-self: flex-start;
  }

  .precheck-body {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  .precheck-figure {
    order: 2;
  }

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

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

  /* 内页 */
  .channel-anchor {
    padding: 18px;
    margin-bottom: 36px;
  }

  .anchor-list {
    gap: 8px 18px;
  }

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

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

  /* 主题索引：主内容在前，侧栏在后 */
  .page-layout,
  .page-layout.sidebar-left {
    display: flex;
    flex-direction: column;
    gap: 32px;
  }

  .topics-main {
    order: 1;
  }

  .topics-aside {
    order: 2;
    position: static;
    padding: 20px;
  }

  .topics-aside .aside-block {
    margin-bottom: 20px;
  }

  .index-anchor-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px 16px;
  }

  .index-guide {
    margin-bottom: 32px;
    padding-bottom: 28px;
  }

  .topic-group {
    padding: 28px 0;
  }

  .entry-guide {
    padding: 24px 20px;
    margin-top: 32px;
  }

  /* 观看说明：主内容在前，侧栏在后 */
  .page-head {
    padding-top: 20px;
  }

  .content-main {
    order: 1;
  }

  .content-aside {
    order: 2;
    position: static;
    padding: 20px;
  }

  .qa-item summary {
    font-size: 1rem;
    padding: 14px 36px 14px 0;
  }

  /* 专题片单 */
  .feature-method .method-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .feature-article {
    display: flex;
    flex-direction: column;
    gap: 20px;
    padding: 32px 0;
  }

  .feature-article .feature-meta,
  .feature-article .feature-body,
  .feature-article .feature-figure {
    order: initial;
  }

  .feature-article .feature-meta {
    order: 1;
  }

  .feature-article .feature-body {
    order: 2;
  }

  .feature-article .feature-figure {
    order: 3;
  }

  .feature-fields {
    grid-template-columns: max-content minmax(0, 1fr);
    gap: 4px 14px;
  }

  .feature-fields dt {
    margin-top: 0;
  }

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

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

  /* 维护说明 */
  .scope-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .table-wrap {
    overflow-x: visible;
    border: 0;
    border-radius: 0;
  }

  .field-table {
    min-width: 0;
    display: block;
  }

  .field-table caption {
    display: block;
    padding: 0 0 14px;
    border-bottom: 0;
  }

  .field-table thead {
    display: none;
  }

  .field-table tbody {
    display: block;
  }

  .field-table tbody tr {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    gap: 6px 16px;
    padding: 16px 18px;
    border: 1px solid var(--line);
    border-radius: 6px;
    margin-bottom: 12px;
  }

  .field-table tbody tr:last-child {
    margin-bottom: 0;
  }

  .field-table tbody th {
    display: block;
    grid-column: 1 / -1;
    padding: 0 0 8px;
    border-bottom: 1px solid var(--line);
    font-size: 14px;
  }

  .field-table tbody td {
    display: block;
    padding: 0;
    border-bottom: 0;
    font-size: 14px;
  }

  .field-table tbody td::before {
    content: attr(data-label);
    display: block;
    font-size: 12px;
    color: var(--graphite);
    letter-spacing: 0.04em;
    margin-bottom: 2px;
  }

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

  .status-legend dl {
    grid-template-columns: 1fr;
    gap: 4px 0;
  }

  .status-legend dd {
    margin-bottom: 10px;
  }

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

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

  /* 合作与反馈 */
  .scope-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    margin-bottom: 32px;
  }

  .scope-figure {
    aspect-ratio: 16 / 9;
    margin-bottom: 36px;
  }

  .prepare-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    margin-bottom: 36px;
  }

  .flow-steps {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    margin-bottom: 36px;
  }

  /* 404 */
  .error-hero {
    padding: 28px 0 40px;
  }

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

  .error-paths {
    padding: 32px 0;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 36px 20px 24px;
  }

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

@media (max-width: 480px) {
  .header-inner {
    padding: 12px 16px;
    gap: 12px;
  }

  .brand {
    font-size: 1.15rem;
  }

  .inner-main,
  .home-main,
  .container,
  .error-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-title {
    font-size: clamp(1.6rem, 7.4vw, 2.1rem);
  }

  .section-head h2,
  .channel-section h2,
  .channel-links h2,
  .index-guide h2,
  .qa-intro h2,
  .error-paths h2 {
    font-size: 1.4rem;
  }

  .hero-text h1 {
    font-size: clamp(1.7rem, 8.4vw, 2.2rem);
  }

  .topic-item,
  .precheck-step,
  .maintenance-item,
  .feedback-col,
  .link-col,
  .related-item,
  .related-col,
  .viewing-bar-item,
  .method-item,
  .scope-item,
  .scope-col,
  .prepare-list li,
  .flow-list .flow-step,
  .feedback-flow .flow-step,
  .related-card,
  .error-path-list li {
    padding: 18px;
  }

  .footer-inner {
    padding: 32px 16px 20px;
  }

  .footer-bottom p {
    padding: 14px 16px;
    font-size: 11px;
  }
}

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

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

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