/* ==========================================================================
   泥视频 · 92yichu.com 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base
   ========================================================================== */

:root {
  --paper: #faf7f2;
  --surface: #fffdf9;
  --ink: #241f1c;
  --muted: #7a6f66;
  --terracotta: #c2643c;
  --olive: #5d6b4a;
  --line: #e6dcd0;
  --sand: #f2e9de;
  --radius: 8px;
  --radius-sm: 6px;
  --shell: 1120px;
  --gutter: 24px;
  --shadow-soft: 0 1px 2px rgba(36, 31, 28, 0.04);
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.78;
  font-weight: 400;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
  line-height: 1.4;
}

p {
  margin: 0 0 14px;
}

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

ul,
ol {
  margin: 0 0 14px;
  padding-left: 20px;
}

li {
  margin-bottom: 6px;
}

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

a {
  color: var(--terracotta);
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease;
}

a:hover,
a:focus-visible {
  color: #a04e2c;
}

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

figure {
  margin: 0;
}

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

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

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top 180ms ease;
}

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

/* ==========================================================================
   layout · 全站骨架
   ========================================================================== */

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

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

.site-main {
  flex: 1 0 auto;
  padding-bottom: 64px;
}

.inner-main {
  padding-top: 0;
}

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(250, 247, 242, 0.94);
  border-bottom: 1px solid transparent;
  backdrop-filter: saturate(140%) blur(6px);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.site-header.is-stuck {
  border-bottom-color: var(--line);
  box-shadow: 0 1px 0 rgba(36, 31, 28, 0.03);
}

.header-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
  flex: 0 0 auto;
}

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

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

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav li {
  margin: 0;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 12px;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 2px solid transparent;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.site-nav a:hover {
  color: var(--terracotta);
}

.site-nav a.is-current {
  color: var(--terracotta);
  border-bottom-color: var(--terracotta);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--surface);
  position: relative;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  border-radius: 1px;
  transition: transform 180ms ease, opacity 180ms 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);
}

/* ---------- 面包屑 ---------- */

.breadcrumb {
  padding: 18px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.breadcrumb .container {
  padding: 0 var(--gutter);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--line);
}

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

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

.breadcrumb-sep {
  color: var(--line);
  padding: 0 4px;
}

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

/* ---------- 页面标题区 ---------- */

.page-header {
  padding: 20px 0 22px;
}

.page-title {
  font-size: 36px;
  line-height: 1.28;
  font-weight: 700;
  color: var(--ink);
  margin: 0;
}

.page-description {
  margin: 12px 0 0;
  font-size: 17px;
  line-height: 1.7;
  color: var(--muted);
}

/* 内页统一页面标题区（channels / pitfalls / feedback 的 page-head） */

.page-head {
  padding: 22px 0 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 32px;
}

.page-head .container {
  padding: 0 var(--gutter);
}

.page-lead {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 760px;
}

/* ---------- 元信息字段行 ---------- */

.field-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px 24px;
  margin: 0;
}

.field-row--inline {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 12px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin: 12px 0 16px;
}

.field,
.field-item {
  margin: 0;
  min-width: 0;
}

.field dt,
.field-item dt {
  font-size: 12px;
  letter-spacing: 0.4px;
  color: var(--muted);
  margin-bottom: 2px;
}

.field dd,
.field-item dd {
  margin: 0;
  font-size: 14px;
  color: var(--ink);
  word-break: break-word;
}

.meta-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px 24px;
  margin: 0;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.meta-item {
  margin: 0;
  min-width: 0;
}

.meta-item dt {
  font-size: 12px;
  letter-spacing: 0.4px;
  color: var(--muted);
  margin-bottom: 2px;
}

.meta-item dd {
  margin: 0;
  font-size: 14px;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* ---------- 两列阅读布局 ---------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 720px) 300px;
  gap: 48px;
  align-items: start;
  padding-top: 28px;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.content-main,
.content-column,
.page-main {
  min-width: 0;
  max-width: 100%;
}

.content-aside,
.side-column,
.page-aside {
  min-width: 0;
  position: sticky;
  top: 96px;
  align-self: start;
}

/* ---------- 页脚 ---------- */

.site-footer {
  flex: 0 0 auto;
  background: var(--sand);
  border-top: 1px solid var(--line);
  padding: 44px 0 0;
  color: var(--ink);
}

.footer-brand {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.footer-name {
  margin: 0 0 6px;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}

.footer-slogan {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 640px;
}

.footer-nav {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.footer-nav ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-nav li {
  margin: 0;
}

.footer-nav a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--ink);
}

.footer-nav a:hover {
  color: var(--terracotta);
}

.footer-about,
.footer-boundary {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.footer-about p,
.footer-boundary p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 880px;
}

.footer-bottom {
  padding: 18px 0 22px;
}

.footer-bottom p {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

/* ==========================================================================
   components · 通用组件
   ========================================================================== */

/* ---------- 图片容器 ---------- */

.media-figure,
.content-figure,
.figure-main,
.card-figure,
.channel-figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--sand);
  border: 1px solid var(--line);
}

.media-figure img,
.content-figure img,
.figure-main img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.media-figure figcaption,
.content-figure figcaption,
.figure-main figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--surface);
  border-top: 1px solid var(--line);
}

/* ---------- 摘要说明框 ---------- */

.note-box {
  background: var(--sand);
  border-left: 3px solid var(--terracotta);
  border-radius: var(--radius-sm);
  padding: 20px 22px;
  margin: 24px 0;
}

.note-box h2 {
  font-size: 22px;
  margin-bottom: 10px;
}

.note-box p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.note-title {
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
  font-size: 15px;
}

.note-link {
  margin-top: 12px;
}

.note-link a {
  font-size: 14px;
  font-weight: 600;
  border-bottom: 1px solid var(--terracotta);
  padding-bottom: 1px;
}

/* ---------- 折叠说明块（FAQ） ---------- */

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

.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0;
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  min-height: 48px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--terracotta);
  transition: transform 180ms ease;
  line-height: 1;
}

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

.faq-item summary:hover {
  background: var(--paper);
}

.faq-body {
  padding: 0 18px 16px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.faq-body p {
  margin: 0 0 10px;
}

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

/* ---------- 侧栏 ---------- */

.aside-title,
.side-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.aside-links,
.aside-list,
.side-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aside-links li,
.aside-list li,
.side-links li {
  margin: 0;
}

.aside-links a,
.aside-list a,
.side-links a {
  display: block;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink);
  transition: border-color 180ms ease, transform 180ms ease;
}

.aside-links a:hover,
.aside-list a:hover,
.side-links a:hover {
  border-color: var(--terracotta);
  transform: translateY(-1px);
  color: var(--ink);
}

.aside-link-title,
.side-link-title {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

.aside-link-desc,
.side-link-desc,
.aside-desc {
  display: block;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 相关支持入口带 ---------- */

.support-band,
.support-strip {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 26px 0;
  margin-top: 40px;
}

.support-list,
.support-band-inner,
.support-strip ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.support-band-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.support-list li,
.support-band-inner a,
.support-strip li {
  margin: 0;
}

.support-item,
.support-band-inner a,
.support-strip a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink);
  min-height: 76px;
  transition: border-color 180ms ease, transform 180ms ease;
}

.support-item:hover,
.support-band-inner a:hover,
.support-strip a:hover {
  border-color: var(--terracotta);
  transform: translateY(-2px);
  color: var(--ink);
}

.support-icon {
  display: inline-block;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  background: var(--olive);
  margin-bottom: 2px;
  font-size: 0;
  line-height: 0;
}

.support-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.support-desc {
  font-size: 12px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 返回顶部 ---------- */

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 80;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
  box-shadow: 0 4px 14px rgba(36, 31, 28, 0.18);
}

.back-to-top::before {
  content: "↑";
  font-size: 20px;
  line-height: 1;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--terracotta);
}

/* ---------- 通用 section ---------- */

.section {
  padding: 48px 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section-block {
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

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

.section-head {
  margin-bottom: 26px;
}

.section-head h2 {
  font-size: 26px;
  line-height: 1.4;
  font-weight: 650;
  color: var(--ink);
  margin: 0 0 8px;
}

.section-lead {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
  max-width: 720px;
}

.section-more {
  margin: 22px 0 0;
  text-align: right;
}

.section-more a {
  font-size: 14px;
  font-weight: 600;
  border-bottom: 1px solid var(--terracotta);
  padding-bottom: 1px;
}

.section-note,
.section-footnote,
.section-boundary,
.boundary-note {
  margin: 24px 0 0;
  padding: 14px 18px;
  background: var(--sand);
  border-left: 3px solid var(--olive);
  border-radius: var(--radius-sm);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* 内页正文 H2 / H3 统一 */

.content-main h2,
.content-column h2,
.page-main h2,
.page-article h2,
.content-body h2 {
  font-size: 26px;
  line-height: 1.4;
  font-weight: 650;
  margin: 0 0 12px;
}

.content-main h3,
.content-column h3,
.page-main h3,
.page-article h3,
.content-body h3 {
  font-size: 19px;
  line-height: 1.45;
  font-weight: 600;
  margin: 20px 0 8px;
}

.content-main p,
.content-column p,
.page-main p,
.page-article p,
.content-body p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink);
}

.content-main > section > p:first-of-type,
.content-column > section > p:first-of-type,
.page-article > section > p:first-of-type,
.content-body > section > p:first-of-type {
  color: var(--muted);
}

/* ==========================================================================
   pages · 首页
   ========================================================================== */

.hero {
  position: relative;
  width: 100%;
  min-height: 460px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  background: var(--sand);
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: relative;
  z-index: 1;
  width: 100%;
  background: linear-gradient(180deg, rgba(250, 247, 242, 0.12) 0%, rgba(250, 247, 242, 0.88) 62%, rgba(250, 247, 242, 0.97) 100%);
  padding: 90px 0 32px;
}

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

.hero-title {
  font-size: 40px;
  line-height: 1.22;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 12px;
  max-width: 720px;
}

.hero-lead {
  font-size: 17px;
  line-height: 1.7;
  color: var(--ink);
  margin: 0 0 22px;
  max-width: 640px;
}

.quick-entry {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.quick-entry-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  transition: border-color 180ms ease, transform 180ms ease, color 180ms ease;
}

.quick-entry-item::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--terracotta);
  flex: 0 0 auto;
}

.quick-entry-item:hover {
  border-color: var(--terracotta);
  color: var(--terracotta);
  transform: translateY(-2px);
}

.quick-entry-name {
  white-space: nowrap;
}

/* 频道速览 */

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

.channel-item {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 18px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 180ms ease, border-color 180ms ease;
}

.channel-item:hover {
  transform: translateY(-2px);
  border-color: rgba(194, 100, 60, 0.55);
}

.channel-figure {
  border-radius: var(--radius-sm);
  margin: 0;
  align-self: start;
}

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

.channel-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.channel-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin: 0;
}

.channel-field {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.4px;
  color: var(--olive);
}

.channel-desc {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 专题速览 */

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

.topic-item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 180ms ease, border-color 180ms ease;
}

.topic-item:hover {
  transform: translateY(-2px);
  border-color: rgba(194, 100, 60, 0.55);
}

.topic-index {
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  color: var(--terracotta);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

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

.topic-name {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 4px;
}

.topic-badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 4px;
  background: var(--sand);
  color: var(--olive);
  font-size: 12px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.topic-meta {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.topic-channel {
  color: var(--olive);
}

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

/* 视频卡片 */

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

.video-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease;
}

.video-card:hover {
  transform: translateY(-2px);
  border-color: rgba(194, 100, 60, 0.55);
}

.card-figure {
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  margin: 0;
}

.card-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.card-tag {
  align-self: flex-start;
  margin: 14px 16px 6px;
  padding: 2px 8px;
  background: rgba(93, 107, 74, 0.12);
  color: var(--olive);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

.card-title {
  margin: 0 16px 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.45;
}

.card-meta {
  margin: 0 16px 8px;
  font-size: 13px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.card-duration {
  display: inline-block;
  padding: 1px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper);
  font-size: 12px;
}

.card-desc {
  margin: 0 16px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* 四步流程 */

.step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.flow-section .step-item {
  position: relative;
  margin: 0;
  padding: 22px 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.flow-section .step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--terracotta);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  margin-bottom: 4px;
}

.flow-section .step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin: 0;
}

.flow-section .step-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* 误区对照（首页） */

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

.contrast-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.contrast-col {
  padding: 16px 20px;
  min-width: 0;
}

.contrast-wrong {
  border-right: 1px solid var(--line);
}

.contrast-label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.4px;
  color: var(--muted);
  margin-bottom: 4px;
}

.contrast-wrong .contrast-label {
  color: var(--muted);
}

.contrast-right .contrast-label {
  color: var(--olive);
}

.contrast-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.contrast-wrong .contrast-text {
  color: var(--muted);
}

.contrast-right .contrast-text {
  color: var(--ink);
  font-weight: 500;
}

/* 内容边界与反馈 */

.boundary-section .note-box h2 {
  font-size: 22px;
}

/* ==========================================================================
   pages · 频道分类
   ========================================================================== */

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

.channel-block:first-of-type {
  border-top: 0;
  padding-top: 8px;
}

.channel-block h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 0 0 8px;
}

.channel-block p {
  margin: 0 0 10px;
}

.point-list {
  margin: 8px 0 0;
  padding-left: 20px;
}

.point-list li {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
  margin-bottom: 6px;
}

.fit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 18px 0 0;
}

.fit-col {
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.fit-col--yes {
  border-left: 3px solid var(--olive);
}

.fit-col--no {
  border-left: 3px solid var(--terracotta);
}

.fit-col h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.fit-col ul {
  margin: 0;
  padding-left: 18px;
}

.fit-col li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 4px;
}

.boundary-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.boundary-item {
  margin: 0;
  padding: 14px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.boundary-pair {
  display: inline-block;
  margin-right: 8px;
  font-weight: 600;
  color: var(--terracotta);
}

/* 三步判断（channels 复用 step-list 纵向） */

.channels-page .step-list,
.content-main .step-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
}

.content-main .step-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.content-main .step-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin: 0;
  min-width: 0;
}

.content-main .step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--sand);
  color: var(--terracotta);
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.content-main .step-item > h3 {
  margin: 0 0 4px;
  font-size: 16px;
}

.content-main .step-item > p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  grid-column: 2;
}

/* 相关内容带（channels） */

.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin: 32px 0 0;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.related-links-label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.4px;
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  transition: border-color 180ms ease, color 180ms ease;
}

.related-links-item:hover {
  border-color: var(--terracotta);
  color: var(--terracotta);
}

/* ==========================================================================
   pages · 专题片单
   ========================================================================== */

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

.method-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 18px 0 0;
}

.method-item {
  padding: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.method-item h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.method-item p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.method-limit {
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  color: var(--terracotta);
}

.playlist {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: playlist;
}

.playlist-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin: 0;
  min-width: 0;
}

.playlist-index {
  font-size: 24px;
  line-height: 1;
  font-weight: 700;
  color: var(--terracotta);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

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

.playlist-body h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.playlist-body p {
  margin: 0 0 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

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

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 6px;
}

.tag {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border-radius: 4px;
  background: rgba(93, 107, 74, 0.12);
  color: var(--olive);
  font-size: 12px;
  font-weight: 600;
}

.tag-meta {
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.advice-list {
  margin: 16px 0 0;
  padding-left: 20px;
}

.advice-list li {
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
  margin-bottom: 8px;
}

/* ==========================================================================
   pages · 观看指南
   ========================================================================== */

.guide-steps > h2 {
  margin-bottom: 8px;
}

.step-block {
  padding: 22px 22px 20px;
  margin: 16px 0 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--terracotta);
  border-radius: var(--radius);
}

.step-block .step-index {
  display: inline-block;
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.4px;
  font-weight: 700;
  color: var(--terracotta);
  font-variant-numeric: tabular-nums;
}

.step-block > h2 {
  font-size: 21px;
  margin: 0 0 8px;
}

.step-block > p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.step-block > h3 {
  margin: 12px 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.2px;
}

.step-criteria {
  margin: 0;
  padding-left: 20px;
}

.step-criteria li {
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
  margin-bottom: 6px;
}

.stuck-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stuck-item {
  margin: 0;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  min-width: 0;
}

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

.stuck-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.skip-item {
  padding: 14px 18px;
  margin: 12px 0 0;
  background: var(--sand);
  border-radius: var(--radius-sm);
}

.skip-item h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

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

/* ==========================================================================
   pages · 入口核验
   ========================================================================== */

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0 0;
}

.check-item {
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.check-item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--ink);
}

.check-where {
  margin: 0 0 6px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.check-where::before {
  content: "观察位置 · ";
  color: var(--olive);
  font-weight: 600;
}

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

.check-verdict::before {
  content: "判断 · ";
  color: var(--terracotta);
  font-weight: 600;
}

.type-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.type-item {
  margin: 0;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  min-width: 0;
}

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

.type-features {
  margin: 0 0 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.type-verdict {
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  font-weight: 500;
}

/* ==========================================================================
   pages · 常见误区
   ========================================================================== */

.compare-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 18px 0 0;
}

.compare-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
}

.compare-say,
.compare-real {
  padding: 16px 18px;
  min-width: 0;
}

.compare-say {
  border-right: 1px solid var(--line);
  background: var(--paper);
}

.compare-say::before {
  content: "常见说法";
  display: block;
  font-size: 12px;
  letter-spacing: 0.4px;
  color: var(--muted);
  margin-bottom: 4px;
}

.compare-real::before {
  content: "实际情况";
  display: block;
  font-size: 12px;
  letter-spacing: 0.4px;
  color: var(--olive);
  margin-bottom: 4px;
}

.compare-label {
  display: none;
}

.compare-say p,
.compare-real p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.compare-say p {
  color: var(--muted);
}

.compare-real p {
  color: var(--ink);
  font-weight: 500;
}

.cause-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 18px 0 0;
}

.cause-item {
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--olive);
  border-radius: var(--radius-sm);
  min-width: 0;
}

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

.cause-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.check-question-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: question;
}

.check-question-list li {
  margin: 0;
  padding: 14px 18px 14px 46px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  position: relative;
  counter-increment: question;
  min-width: 0;
}

.check-question-list li::before {
  content: counter(question);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--sand);
  color: var(--terracotta);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.question-text {
  margin: 0 0 4px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  font-weight: 600;
}

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

/* ==========================================================================
   pages · 反馈说明
   ========================================================================== */

.scope-block {
  padding: 18px 20px;
  margin: 14px 0 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scope-block h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.scope-block p {
  margin: 0 0 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.scope-examples {
  margin: 0;
  padding: 10px 14px;
  background: var(--paper);
  border-left: 2px solid var(--olive);
  border-radius: 4px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink);
}

.element-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  counter-reset: element;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.element-list li {
  margin: 0;
  padding: 12px 16px 12px 46px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  position: relative;
  counter-increment: element;
  min-width: 0;
}

.element-list li::before {
  content: counter(element);
  position: absolute;
  left: 14px;
  top: 12px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--terracotta);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.element-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 2px;
}

.element-tip {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.note-line {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.boundary-box {
  margin: 16px 0 0;
  padding: 18px 20px;
  background: var(--sand);
  border-left: 3px solid var(--terracotta);
  border-radius: var(--radius-sm);
}

.boundary-box p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

.boundary-box p:last-child {
  margin-bottom: 0;
}

.reject-list {
  margin: 14px 0 0;
  padding-left: 20px;
}

.reject-list li {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: 6px;
}

/* ==========================================================================
   pages · 404
   ========================================================================== */

.site-error .error-main {
  padding: 60px 0 40px;
}

.error-wrap {
  max-width: 760px;
}

.error-code {
  margin: 0 0 8px;
  font-size: 14px;
  letter-spacing: 0.6px;
  color: var(--terracotta);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.error-title {
  font-size: 36px;
  line-height: 1.28;
  font-weight: 700;
  margin: 0 0 12px;
}

.error-lead {
  font-size: 17px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0 0 32px;
}

.error-paths,
.error-tips {
  margin-bottom: 32px;
}

.error-paths h2,
.error-tips h2 {
  font-size: 22px;
  margin: 0 0 12px;
}

.error-path-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.error-path-list li {
  margin: 0;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  min-width: 0;
}

.error-path-list h3 {
  margin: 0 0 4px;
  font-size: 15px;
}

.error-path-list p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.error-tips ul {
  margin: 0;
  padding-left: 20px;
}

.error-tips li {
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
  margin-bottom: 6px;
}

.error-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.btn-primary {
  background: var(--terracotta);
  color: #fff;
  border: 1px solid var(--terracotta);
}

.btn-primary:hover {
  background: #a04e2c;
  border-color: #a04e2c;
  color: #fff;
}

.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
}

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

/* ==========================================================================
   responsive
   ========================================================================== */

@media (max-width: 960px) {
  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .content-aside,
  .side-column,
  .page-aside {
    position: static;
    top: auto;
  }

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

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

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

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

  .support-list,
  .support-band-inner,
  .support-strip ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-title {
    font-size: 32px;
  }

  .hero {
    min-height: 400px;
  }

  .hero-overlay {
    padding-top: 70px;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 8px 20px rgba(36, 31, 28, 0.08);
    display: block;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 220ms ease;
    z-index: 95;
  }

  .site-nav.is-open {
    max-height: 520px;
  }

  .site-nav ul {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
  }

  .site-nav a {
    display: flex;
    height: 48px;
    padding: 0 24px;
    border-bottom: 0;
    border-left: 3px solid transparent;
    border-radius: 0;
    font-size: 15px;
  }

  .site-nav a.is-current {
    border-left-color: var(--terracotta);
    border-bottom: 0;
    background: var(--sand);
  }

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

  .header-inner {
    position: relative;
  }
}

@media (max-width: 720px) {
  :root {
    --gutter: 18px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    height: 64px;
  }

  .brand {
    font-size: 18px;
  }

  .page-title {
    font-size: 26px;
    line-height: 1.32;
  }

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

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

  .page-head {
    padding: 18px 0 20px;
    margin-bottom: 24px;
  }

  .field-row,
  .field-row--inline,
  .meta-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 16px;
  }

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

  .section {
    padding: 36px 0;
  }

  .section-head h2 {
    font-size: 21px;
  }

  .content-main h2,
  .content-column h2,
  .page-main h2,
  .page-article h2,
  .content-body h2 {
    font-size: 21px;
    line-height: 1.45;
  }

  .content-main h3,
  .content-column h3,
  .page-main h3,
  .page-article h3,
  .content-body h3 {
    font-size: 17px;
  }

  .hero {
    min-height: 0;
    align-items: stretch;
  }

  .hero-media img {
    aspect-ratio: 4 / 3;
    height: auto;
  }

  .hero-overlay {
    background: linear-gradient(180deg, rgba(250, 247, 242, 0.05) 0%, rgba(250, 247, 242, 0.9) 42%, rgba(250, 247, 242, 0.98) 100%);
    padding: 140px 0 24px;
  }

  .hero-title {
    font-size: 26px;
    line-height: 1.3;
  }

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

  .quick-entry {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .quick-entry-item {
    justify-content: center;
    padding: 0 12px;
    font-size: 13px;
  }

  .quick-entry-name {
    white-space: normal;
    text-align: center;
  }

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

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

  .topic-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .topic-index {
    font-size: 24px;
  }

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

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

  .flow-section .step-item {
    position: relative;
    padding-left: 56px;
  }

  .flow-section .step-item::before {
    content: "";
    position: absolute;
    left: 27px;
    top: 54px;
    bottom: -18px;
    width: 2px;
    background: var(--line);
  }

  .flow-section .step-item:last-child::before {
    display: none;
  }

  .flow-section .step-index {
    position: absolute;
    left: 14px;
    top: 18px;
    margin: 0;
  }

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

  .contrast-wrong {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

  .compare-say {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

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

  .playlist-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 14px;
  }

  .playlist-index {
    font-size: 20px;
  }

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

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

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

  .support-list,
  .support-band-inner,
  .support-strip ul {
    grid-template-columns: minmax(0, 1fr);
  }

  .support-item,
  .support-band-inner a,
  .support-strip a {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    min-height: 56px;
    padding: 12px 14px;
  }

  .support-icon {
    margin-bottom: 0;
    flex: 0 0 auto;
  }

  .support-title {
    flex: 0 0 auto;
  }

  .support-desc {
    flex: 1 1 auto;
  }

  .content-main .step-item {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 10px;
    padding: 14px;
  }

  .content-main .step-index {
    width: 28px;
    height: 28px;
    font-size: 13px;
  }

  .step-block {
    padding: 18px 16px;
  }

  .step-block > h2 {
    font-size: 19px;
  }

  .footer-nav ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 16px;
  }

  .footer-nav a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .note-box {
    padding: 16px 18px;
  }

  .note-box h2 {
    font-size: 19px;
  }

  .back-to-top {
    right: 14px;
    bottom: 14px;
  }

  .site-footer {
    padding-top: 32px;
  }

  .footer-name {
    font-size: 18px;
  }

  .related-links {
    flex-direction: column;
    align-items: flex-start;
  }

  .related-links-item {
    width: 100%;
    justify-content: center;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}