:root {
  --bg: #FAF7F2;
  --ink: #1B1B1B;
  --accent: #B23A2E;
  --line: #C9C4BC;
  --muted: #5A5550;
  --panel: #EFEBE4;
  --container: 1080px;
  --radius: 6px;
  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", "SimHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

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

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

p {
  margin: 0 0 1em;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.2em;
}

li {
  margin-bottom: 0.4em;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line);
  background-color: var(--panel);
}

figure {
  margin: 0;
}

figcaption {
  margin-top: 0.5em;
  font-size: 14px;
  color: var(--muted);
}

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

caption {
  padding: 0 0 0.75em;
  font-size: 15px;
  color: var(--muted);
  text-align: left;
}

th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  font-size: 15px;
}

thead th {
  background-color: var(--panel);
  font-weight: 700;
}

tbody th {
  background-color: var(--panel);
  font-weight: 700;
  width: 32%;
}

dl {
  margin: 0;
}

dt {
  font-weight: 700;
  font-size: 14px;
  color: var(--muted);
}

dd {
  margin: 0 0 0.5em;
  font-size: 15px;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 10px 16px;
  background-color: var(--accent);
  color: #fff;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

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

.site-header {
  border-bottom: 2px solid var(--ink);
  background-color: var(--bg);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
  border: 2px solid var(--ink);
  padding: 4px 12px;
  background-color: var(--bg);
  flex: 0 0 auto;
}

.brand:hover,
.brand:focus-visible {
  background-color: var(--accent);
  color: #fff;
  border-color: var(--accent);
  text-decoration: none;
}

.site-nav {
  margin-left: auto;
}

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

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: block;
  padding: 8px 12px;
  color: var(--ink);
  font-size: 15px;
  border-bottom: 2px solid transparent;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--accent);
  text-decoration: none;
}

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

.nav-toggle {
  display: none;
  margin-left: auto;
  padding: 10px 14px;
  font-size: 15px;
  font-family: var(--font-body);
  color: var(--ink);
  background-color: var(--bg);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  cursor: pointer;
  min-height: 44px;
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  background-color: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

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

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

.inner-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 64px;
  width: 100%;
}

.page-layout {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 64px;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.page-layout .inner-main {
  max-width: none;
  margin: 0;
  padding: 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 14px;
  color: var(--muted);
}

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

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

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

.breadcrumb-current {
  color: var(--ink);
  font-weight: 700;
}

.page-header {
  padding: 20px 0 22px;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 36px;
}

.page-title {
  font-size: 34px;
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  color: var(--muted);
  max-width: 72ch;
  margin: 0;
}

.section {
  margin-bottom: 52px;
}

.content-section {
  margin-bottom: 52px;
}

.section-title,
.content-section h2 {
  font-size: 24px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
}

.section-intro,
.section-lead {
  font-size: 16px;
  color: var(--muted);
  max-width: 72ch;
  margin-bottom: 24px;
}

.section-body {
  max-width: 72ch;
}

.section-body p {
  margin-bottom: 1em;
}

/* ==========================================================
   components
   ========================================================== */
.btn {
  display: inline-block;
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font-head);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--bg);
  color: var(--ink);
  min-height: 44px;
  line-height: 1.3;
  text-align: center;
}

.btn:hover,
.btn:focus-visible {
  text-decoration: none;
}

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

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

.btn-outline {
  background-color: var(--bg);
  border-color: var(--ink);
  color: var(--ink);
}

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

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

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

.back-to-top {
  display: inline-block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 700;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  color: var(--ink);
  background-color: var(--bg);
  min-height: 44px;
  line-height: 1.6;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-decoration: none;
}

/* 通用图片容器 */
.hero-figure,
.content-media,
.section-media,
.media-figure,
.content-figure,
.section-figure {
  overflow: hidden;
  border-radius: var(--radius);
  background-color: var(--panel);
}

.hero-figure img,
.content-media img,
.section-media img,
.media-figure img,
.content-figure img,
.section-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: none;
}

/* 语义表格统一观感 */
.field-table,
.data-table {
  margin-bottom: 12px;
}

/* ==========================================================
   pages : index
   ========================================================== */
.site-home .hero-section {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 36px;
  align-items: start;
  padding: 44px 0 48px;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 52px;
}

.hero-text {
  max-width: 620px;
}

.hero-title {
  font-size: 34px;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 17px;
  margin-bottom: 14px;
}

.hero-note {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 26px;
}

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

.hero-figure {
  margin-bottom: 20px;
}

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

.content-media-primary img {
  aspect-ratio: 16 / 7;
}

/* 题材频道方向总览 */
.channel-overview .section-intro {
  margin-bottom: 28px;
}

.channel-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--ink);
}

.channel-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
}

.channel-main {
  flex: 1 1 320px;
  min-width: 0;
}

.channel-name {
  font-size: 18px;
  margin-bottom: 6px;
}

.channel-desc {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 6px;
}

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

.channel-orient {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 6px;
}

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

.channel-link,
.playlist-link,
.card-link {
  flex: 0 0 auto;
  display: inline-block;
  padding: 9px 18px;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font-head);
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  color: var(--ink);
  background-color: var(--bg);
  min-height: 44px;
  line-height: 1.5;
}

.channel-link:hover,
.channel-link:focus-visible,
.playlist-link:hover,
.playlist-link:focus-visible,
.card-link:hover,
.card-link:focus-visible {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-decoration: none;
}

/* 本期专题片单速览 */
.playlist-overview .section-intro {
  margin-bottom: 28px;
}

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

.playlist-card {
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--bg);
  box-shadow: 4px 4px 0 var(--line);
}

.playlist-name {
  font-size: 18px;
  margin-bottom: 10px;
}

.playlist-scope {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 10px;
}

.playlist-channel {
  font-size: 14px;
  margin-bottom: 20px;
}

.playlist-link {
  margin-top: auto;
  align-self: flex-start;
}

/* 条目字段与收录边界摘要 */
.field-summary .section-intro {
  margin-bottom: 24px;
}

.field-footnote {
  font-size: 15px;
  color: var(--muted);
  margin-top: 14px;
}

/* 查阅路径三步概览 */
.path-overview .section-intro {
  margin-bottom: 24px;
}

.path-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: path;
  border-top: 2px solid var(--ink);
}

.path-step {
  counter-increment: path;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
}

.path-step::before {
  content: counter(path, decimal-leading-zero);
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.path-name {
  font-size: 18px;
  margin-bottom: 6px;
}

.path-desc {
  font-size: 15px;
  color: var(--muted);
  margin: 0;
}

.path-footnote {
  font-size: 15px;
  margin-top: 16px;
}

/* 收录边界与站内反馈入口 */
.boundary-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.boundary-col {
  padding: 22px 20px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--panel);
}

.boundary-subtitle {
  font-size: 18px;
  margin-bottom: 12px;
}

.boundary-list {
  margin: 0;
  padding-left: 1.1em;
}

.boundary-list li {
  font-size: 15px;
}

.boundary-desc {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 14px;
}

/* ==========================================================
   pages : inner shared
   ========================================================== */
.page-aside {
  position: sticky;
  top: 96px;
  padding: 20px 18px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--panel);
}

.aside-title {
  font-size: 17px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
}

.aside-index {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
}

.aside-index li {
  margin-bottom: 2px;
}

.aside-index a {
  display: block;
  padding: 8px 6px;
  font-size: 15px;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
}

.aside-index a:hover,
.aside-index a:focus-visible {
  color: var(--accent);
  text-decoration: none;
}

.aside-note {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}

/* 频道逐行详情 */
.section-channels .section-lead {
  margin-bottom: 24px;
}

.section-channels .channel-row {
  border-bottom: 1px solid var(--line);
}

.section-channels .channel-row:first-of-type {
  border-top: 2px solid var(--ink);
}

/* 典型条目示例 */
.sample-group {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.sample-group:first-of-type {
  border-top: 2px solid var(--ink);
}

.sample-group-title {
  font-size: 18px;
  margin-bottom: 12px;
}

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

.sample-item {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  padding: 8px 0;
  font-size: 15px;
  border-bottom: 1px dashed var(--line);
}

.sample-item:last-child {
  border-bottom: none;
}

.sample-name {
  font-weight: 700;
}

.sample-fields {
  color: var(--muted);
}

/* 步骤清单（频道页 / 片单页） */
.step-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  border-top: 2px solid var(--ink);
}

.step-item {
  counter-increment: step;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
}

.step-item::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.step-name,
.step-title {
  font-size: 18px;
  margin-bottom: 6px;
}

.step-desc,
.step-text {
  font-size: 15px;
  color: var(--muted);
  margin: 0;
}

/* ==========================================================
   pages : zhuan-ti-pian-dan
   ========================================================== */
.list-grid {
  display: grid;
  gap: 20px;
}

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

.card {
  display: flex;
  flex-direction: column;
  padding: 22px 20px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--bg);
  box-shadow: 4px 4px 0 var(--line);
}

.card-title {
  font-size: 18px;
  margin-bottom: 10px;
}

.card-text {
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 14px;
}

.card-meta {
  margin-bottom: 20px;
}

.card-meta dt {
  margin-top: 8px;
}

.card-meta dd {
  margin-bottom: 0;
}

.card-link {
  margin-top: auto;
  align-self: flex-start;
}

.section-foot {
  font-size: 15px;
  margin-top: 16px;
}

/* ==========================================================
   pages : tiao-mu-zi-duan
   ========================================================== */
.section-field-table p {
  color: var(--muted);
  margin-bottom: 20px;
}

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

.misread-item {
  padding: 22px 20px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--panel);
}

.misread-item h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.misread-item p {
  font-size: 15px;
  color: var(--muted);
  margin: 0;
}

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

.related-links li {
  margin: 0;
}

.related-links a {
  display: block;
  padding: 12px 16px;
  font-size: 15px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background-color: var(--bg);
  min-height: 44px;
}

.related-links a:hover,
.related-links a:focus-visible {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-decoration: none;
}

/* ==========================================================
   pages : shou-lu-bian-jie
   ========================================================== */
.section-scope .section-body {
  margin-bottom: 24px;
}

.section-figure img {
  aspect-ratio: 16 / 6;
}

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

.exclude-col {
  padding: 22px 20px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--panel);
}

.exclude-col h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.exclude-col-no h3 {
  color: var(--accent);
}

.exclude-list {
  margin: 0;
  padding-left: 1.1em;
}

.exclude-list li {
  font-size: 15px;
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: check;
  border-top: 2px solid var(--ink);
}

.checklist-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
}

.checklist-num {
  display: block;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.checklist-item h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.checklist-item p {
  font-size: 15px;
  color: var(--muted);
  margin: 0;
}

.section-path .path-list {
  counter-reset: none;
}

.section-path .path-step {
  grid-template-columns: 56px minmax(0, 1fr);
}

.section-path .path-step::before {
  content: none;
}

.section-path .path-num {
  display: block;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.section-path .path-step h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.section-path .path-step p {
  font-size: 15px;
  color: var(--muted);
  margin: 0;
}

/* FAQ 展开块 */
.faq-list {
  border-top: 2px solid var(--ink);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-question {
  cursor: pointer;
  padding: 16px 32px 16px 4px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  position: relative;
  list-style: none;
  min-height: 44px;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--accent);
}

.faq-item[open] .faq-question::after {
  content: "\2212";
}

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

.faq-answer {
  padding: 0 4px 18px;
  font-size: 15px;
  color: var(--muted);
  max-width: 72ch;
  margin: 0;
}

/* ==========================================================
   pages : 404
   ========================================================== */
.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 24px 64px;
}

.error-block {
  padding: 36px 28px;
  border: 2px solid var(--ink);
  border-radius: var(--radius);
  background-color: var(--panel);
  margin-bottom: 40px;
}

.error-block h1 {
  font-size: 34px;
  margin-bottom: 16px;
}

.error-text {
  font-size: 16px;
  color: var(--muted);
  max-width: 72ch;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.error-help h2 {
  font-size: 24px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
  margin-bottom: 16px;
}

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

.error-list li {
  margin: 0;
}

.error-list a {
  display: block;
  padding: 12px 16px;
  font-size: 15px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background-color: var(--bg);
  min-height: 44px;
}

.error-list a:hover,
.error-list a:focus-visible {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #fff;
  text-decoration: none;
}

/* ==========================================================
   footer
   ========================================================== */
.site-footer {
  border-top: 2px solid var(--ink);
  background-color: var(--panel);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}

.footer-title {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
}

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

.footer-links li {
  margin-bottom: 6px;
}

.footer-links a {
  font-size: 14px;
  color: var(--muted);
}

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

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

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px 28px;
  font-size: 13px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ==========================================================
   responsive
   ========================================================== */
@media (max-width: 900px) {
  .playlist-grid,
  .pian-dan-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 768px) {
  .header-inner {
    padding: 12px 16px;
    gap: 12px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    flex: 1 1 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    gap: 0;
    width: 100%;
    border-top: 2px solid var(--line);
    padding-top: 6px;
  }

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

  .nav-list a {
    padding: 12px 6px;
    font-size: 16px;
    min-height: 48px;
    border-bottom: 1px solid var(--line);
  }

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

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

  .page-title,
  .hero-title,
  .error-block h1 {
    font-size: 24px;
  }

  .section-title,
  .content-section h2,
  .error-help h2 {
    font-size: 20px;
  }

  .channel-name,
  .playlist-name,
  .card-title,
  .sample-group-title,
  .step-name,
  .step-title,
  .path-name,
  .misread-item h3,
  .exclude-col h3,
  .checklist-item h3,
  .section-path .path-step h3,
  .boundary-subtitle {
    font-size: 17px;
  }

  .site-home .hero-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 28px 0 32px;
    margin-bottom: 40px;
  }

  .hero-text {
    order: 2;
    max-width: none;
  }

  .hero-figure {
    order: 1;
  }

  .playlist-grid,
  .pian-dan-grid,
  .boundary-columns,
  .misread-grid,
  .exclude-columns,
  .related-links,
  .error-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-layout {
    display: block;
  }

  .page-aside {
    position: static;
    margin-bottom: 32px;
  }

  .aside-index {
    display: flex;
    flex-wrap: nowrap;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
  }

  .aside-index li {
    flex: 0 0 auto;
    margin: 0;
  }

  .aside-index a {
    white-space: nowrap;
    border: 2px solid var(--line);
    border-radius: var(--radius);
    padding: 10px 14px;
    min-height: 44px;
  }

  .channel-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .channel-link,
  .playlist-link,
  .card-link {
    align-self: flex-start;
  }

  .path-step,
  .step-item,
  .checklist-item,
  .section-path .path-step {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 16px 20px;
  }

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

@media (max-width: 420px) {
  body {
    font-size: 15px;
  }

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

  .btn {
    width: 100%;
  }

  .playlist-card,
  .card,
  .boundary-col,
  .misread-item,
  .exclude-col,
  .error-block {
    padding: 18px 16px;
    box-shadow: none;
  }
}

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