:root {
  --bg-page: #f7faf9;
  --bg-card: #ffffff;
  --bg-soft: #e3f2f0;
  --text-main: #1f2d2b;
  --text-sub: #5a6b68;
  --primary: #1f7a6b;
  --primary-dark: #175c51;
  --primary-soft: #e3f2f0;
  --warn: #c94f4f;
  --line: #d9e4e2;
  --radius: 8px;
  --radius-sm: 6px;
  --content-width: 1120px;
  --read-width: 760px;
  --shadow-soft: 0 1px 2px rgba(31, 45, 43, 0.05), 0 4px 12px rgba(31, 45, 43, 0.04);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

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

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

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

.site-body {
  margin: 0;
  background-color: var(--bg-page);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-main);
}

p {
  margin: 0;
}

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

figure {
  margin: 0;
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

/* =========================================================
   layout
   ========================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(247, 250, 249, 0.94);
  backdrop-filter: saturate(140%) blur(6px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
  font-weight: 700;
  font-size: 17px;
  flex: 0 0 auto;
}

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

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background-color: var(--primary);
  position: relative;
  flex: 0 0 auto;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 8px;
  border-radius: 2px;
  background-color: #ffffff;
}

.brand-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

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

.nav-link {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 14px;
  color: var(--text-sub);
  font-size: 15px;
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--primary);
  border-bottom-color: var(--primary-soft);
}

.nav-link.is-current {
  color: var(--primary);
  font-weight: 600;
  border-bottom-color: var(--primary);
}

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

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
}

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 24px 24px 56px;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

.layout-main-aside {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 40px;
  align-items: start;
}

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

.layout-aside {
  min-width: 0;
}

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

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

.sidebar-left .page-layout,
.sidebar-left .layout-main-aside {
  grid-template-columns: 300px minmax(0, 1fr);
}

.sidebar-left .layout-aside,
.sidebar-left .content-aside {
  order: -1;
}

.site-footer {
  background-color: #ffffff;
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 44px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
}

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

.footer-title {
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
}

.footer-brand {
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
}

.footer-desc {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

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

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

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

.footer-scope p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

.footer-help p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
}

.footer-bottom {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 16px 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line);
}

.copyright {
  font-size: 13px;
  color: var(--text-sub);
}

.back-to-top {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--bg-page);
  color: var(--text-sub);
  font-size: 13px;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.back-to-top::before {
  content: "↑";
  font-size: 16px;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  color: var(--primary);
  border-color: var(--primary);
  background-color: var(--primary-soft);
}

/* =========================================================
   components
   ========================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

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

.btn-outline {
  background-color: #ffffff;
  color: var(--primary);
  border-color: var(--primary);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background-color: var(--primary-soft);
  color: var(--primary-dark);
}

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

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

.tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border-radius: 999px;
  background-color: var(--bg-soft);
  color: var(--primary-dark);
  font-size: 12px;
  line-height: 1;
  white-space: nowrap;
}

.status-tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 1;
  white-space: nowrap;
}

.status-tag-info {
  background-color: var(--bg-soft);
  color: var(--primary-dark);
}

.status-tag-warn {
  background-color: #fbeaea;
  color: var(--warn);
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: #ffffff;
}

.field-table,
.data-table {
  min-width: 560px;
  font-size: 15px;
}

.field-table caption,
.data-table caption,
.table-caption {
  padding: 14px 16px 0;
  text-align: left;
  font-size: 14px;
  color: var(--text-sub);
}

.field-table th,
.field-table td,
.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.field-table thead th,
.data-table thead th {
  background-color: var(--bg-soft);
  color: var(--text-main);
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
}

.field-table tbody tr:last-child th,
.field-table tbody tr:last-child td,
.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td {
  border-bottom: none;
}

.field-table tbody th,
.data-table tbody th {
  font-weight: 600;
  color: var(--text-main);
}

.field-table tbody td,
.data-table tbody td {
  color: var(--text-sub);
}

.field-key {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-main);
  white-space: nowrap;
}

.field-name {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-main);
  white-space: nowrap;
}

.field-sample {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-sub);
}

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

.step-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.step-num,
.step-index,
.step-no {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: var(--primary-soft);
  color: var(--primary-dark);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.step-body {
  min-width: 220px;
}

.step-body p {
  margin-top: 6px;
  font-size: 15px;
  color: var(--text-sub);
}

.step-title {
  font-size: 16px;
  font-weight: 600;
}

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

.scope-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scope-item p {
  min-width: 220px;
  font-size: 15px;
  color: var(--text-sub);
}

.scope-tag {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 10px;
  border-radius: 999px;
  background-color: var(--bg-soft);
  color: var(--primary-dark);
  font-size: 12px;
  line-height: 1;
  white-space: nowrap;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: #ffffff;
  color: var(--text-main);
  font-size: 15px;
}

.related-links a:hover,
.related-links a:focus-visible {
  color: var(--primary);
  border-color: var(--primary);
  background-color: var(--primary-soft);
}

.inline-link {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.inline-link:hover,
.inline-link:focus-visible {
  color: var(--primary-dark);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 14px;
  color: var(--text-sub);
}

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

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

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

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

.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-main);
}

.page-description {
  margin-top: 10px;
  max-width: var(--read-width);
  font-size: 15px;
  color: var(--text-sub);
}

.section {
  margin-bottom: 48px;
}

.section:last-child {
  margin-bottom: 0;
}

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

.section-head h2,
.section-title {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-main);
}

.section-desc,
.section-intro {
  margin-top: 8px;
  max-width: var(--read-width);
  font-size: 15px;
  color: var(--text-sub);
}

.section-foot {
  margin-top: 18px;
  font-size: 15px;
}

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

.section > h2 {
  font-size: 22px;
  font-weight: 700;
}

.section > h2 + p {
  margin-top: 8px;
  max-width: var(--read-width);
  font-size: 15px;
  color: var(--text-sub);
}

/* =========================================================
   pages
   ========================================================= */

/* ---------- 首页 ---------- */

.home-main {
  display: block;
}

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

.hero-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 24px 44px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 480px);
  gap: 44px;
  align-items: center;
}

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

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  height: 26px;
  padding: 0 12px;
  border-radius: 999px;
  background-color: var(--bg-soft);
  color: var(--primary-dark);
  font-size: 13px;
}

.hero-title {
  margin-top: 16px;
  font-size: 32px;
  font-weight: 700;
  line-height: 1.32;
  color: var(--text-main);
}

.hero-lead {
  margin-top: 14px;
  max-width: 560px;
  font-size: 16px;
  color: var(--text-sub);
}

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

.hero-note {
  margin-top: 18px;
  padding-left: 12px;
  border-left: 3px solid var(--primary-soft);
  font-size: 14px;
  color: var(--text-sub);
}

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

.hero-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--bg-soft);
}

.hero-media figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-sub);
}

.section-genres,
.section-topics,
.section-fields,
.section-prepare,
.section-boundary {
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

.section-genres {
  padding-top: 48px;
}

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

.genre-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.genre-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-soft);
}

.genre-name {
  font-size: 18px;
  font-weight: 600;
}

.genre-scope {
  font-size: 15px;
  color: var(--text-sub);
}

.genre-flag,
.genre-tags {
  font-size: 13px;
  color: var(--text-sub);
}

.genre-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.genre-link,
.genre-more {
  margin-top: auto;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
}

.genre-link::after,
.genre-more::after {
  content: " →";
}

.genre-link:hover,
.genre-more:hover,
.genre-link:focus-visible,
.genre-more:focus-visible {
  color: var(--primary-dark);
}

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

.topic-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.topic-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-soft);
}

.topic-name {
  font-size: 18px;
  font-weight: 600;
}

.topic-scope,
.topic-desc {
  font-size: 15px;
  color: var(--text-sub);
}

.topic-flag {
  font-size: 13px;
  color: var(--text-sub);
}

.topic-link {
  margin-top: auto;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary);
}

.topic-link::after {
  content: " →";
}

.topic-link:hover,
.topic-link:focus-visible {
  color: var(--primary-dark);
}

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

.boundary-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.boundary-item p {
  font-size: 15px;
  color: var(--text-sub);
}

.boundary-media {
  margin-top: 24px;
}

.boundary-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--bg-soft);
}

.boundary-media figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-sub);
}

/* ---------- 题材频道 ---------- */

.page-genre-channels .genre-overview .genre-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.genre-visual-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
}

.genre-figure {
  min-width: 0;
}

.genre-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--bg-soft);
}

.genre-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-sub);
}

.genre-visual-text {
  min-width: 0;
  display: grid;
  gap: 12px;
}

.genre-visual-text p {
  font-size: 15px;
  color: var(--text-sub);
}

.genre-notes .step-list {
  max-width: var(--read-width);
}

.related-entry p {
  max-width: var(--read-width);
  font-size: 15px;
  color: var(--text-sub);
}

.related-entry .related-links {
  margin-top: 16px;
}

.aside-block {
  padding: 18px 20px;
  margin-bottom: 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.aside-block h2 {
  font-size: 16px;
  font-weight: 600;
}

.aside-block > p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-sub);
}

.aside-links {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aside-links a {
  font-size: 14px;
}

.status-list {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.status-item {
  display: flex;
  gap: 8px;
  font-size: 14px;
  color: var(--text-sub);
}

.status-item::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-top: 8px;
  border-radius: 50%;
  background-color: var(--primary);
}

.update-list {
  margin-top: 12px;
  display: grid;
  gap: 10px;
  font-size: 14px;
  color: var(--text-sub);
}

/* ---------- 专题片单 ---------- */

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

.section-topic-list .topic-card {
  padding: 0;
  overflow: hidden;
}

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

.topic-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background-color: var(--bg-soft);
}

.topic-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px;
}

.topic-direction {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-sub);
}

.topic-scope {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 14px;
  color: var(--text-sub);
}

.section-topic-order .step-list {
  max-width: var(--read-width);
}

.section-related .related-links {
  margin-top: 16px;
}

/* ---------- 剧集索引 ---------- */

.index-fields > p,
.index-structure > p,
.index-locate > p,
.index-limits > p {
  margin-top: 8px;
  max-width: var(--read-width);
  font-size: 15px;
  color: var(--text-sub);
}

.index-figure {
  margin: 20px 0;
}

.index-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--bg-soft);
}

.index-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-sub);
}

.index-structure,
.index-locate,
.index-limits {
  margin-top: 40px;
}

.index-structure .step-list,
.index-locate .step-list {
  margin-top: 18px;
}

.index-limits .scope-list {
  margin-top: 18px;
}

.inline-note {
  margin-top: 16px;
  font-size: 15px;
}

.aside-title {
  font-size: 16px;
  font-weight: 600;
}

.aside-fields {
  margin-top: 12px;
  display: grid;
  gap: 8px;
  font-size: 14px;
  color: var(--text-sub);
}

/* ---------- 观看指引 ---------- */

.guide-section {
  margin-bottom: 44px;
}

.guide-section:last-child {
  margin-bottom: 0;
}

.guide-section h2 {
  font-size: 22px;
  font-weight: 700;
}

.guide-section .section-intro {
  margin-top: 8px;
}

.guide-figure {
  margin: 20px 0;
}

.guide-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--bg-soft);
}

.guide-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-sub);
}

.guide-steps {
  display: grid;
  gap: 18px;
  max-width: var(--read-width);
  counter-reset: guide-step;
}

.guide-step {
  padding: 18px 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.guide-step h3 {
  font-size: 16px;
  font-weight: 600;
}

.guide-step h3::before {
  counter-increment: guide-step;
  content: counter(guide-step) ". ";
  font-family: var(--font-mono);
  color: var(--primary);
}

.guide-step p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--text-sub);
}

.guide-notes {
  display: grid;
  gap: 14px;
  max-width: var(--read-width);
}

.guide-note {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--text-sub);
}

.guide-section .scope-list {
  max-width: var(--read-width);
}

.faq-list {
  margin-top: 18px;
  max-width: var(--read-width);
  display: grid;
  gap: 12px;
}

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

.faq-item summary {
  padding: 16px 48px 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  color: var(--primary);
}

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

.faq-item summary:hover {
  color: var(--primary);
}

.faq-item p {
  padding: 0 20px 18px;
  font-size: 15px;
  color: var(--text-sub);
}

/* ---------- 404 ---------- */

.error-main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 64px 24px 72px;
}

.error-hero {
  max-width: var(--read-width);
}

.error-hero h1 {
  font-size: 28px;
  font-weight: 700;
}

.error-lead {
  margin-top: 12px;
  font-size: 16px;
  color: var(--text-sub);
}

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

.error-paths {
  margin-top: 52px;
}

.error-paths h2 {
  font-size: 22px;
  font-weight: 700;
}

.error-path-list {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.error-path-item {
  padding: 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-path-item h3 {
  font-size: 16px;
  font-weight: 600;
}

.error-path-item p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--text-sub);
}

.error-note {
  margin-top: 44px;
  padding: 20px;
  background-color: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  max-width: var(--read-width);
}

.error-note h2 {
  font-size: 18px;
  font-weight: 600;
}

.error-note p {
  margin-top: 8px;
  font-size: 15px;
  color: var(--text-sub);
}

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

@media (max-width: 960px) {
  .header-inner {
    padding: 0 20px;
    gap: 16px;
  }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 64px;
    margin-left: 0;
    background-color: #ffffff;
    border-bottom: 1px solid var(--line);
    padding: 8px 20px 16px;
  }

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

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

  .nav-link {
    height: 48px;
    padding: 0 4px;
    border-bottom: 1px solid var(--line);
    justify-content: flex-start;
  }

  .nav-list li:last-child .nav-link {
    border-bottom: none;
  }

  .nav-link.is-current {
    border-bottom-color: var(--line);
  }

  .inner-main {
    padding: 20px 20px 48px;
  }

  .page-layout,
  .layout-main-aside,
  .sidebar-left .page-layout,
  .sidebar-left .layout-main-aside {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .sidebar-left .layout-aside,
  .sidebar-left .content-aside {
    order: 0;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 40px 20px 36px;
  }

  .hero-media img {
    height: 260px;
  }

  .hero-title {
    font-size: 28px;
  }

  .section-genres,
  .section-topics,
  .section-fields,
  .section-prepare,
  .section-boundary {
    padding-left: 20px;
    padding-right: 20px;
  }

  .section-genres {
    padding-top: 40px;
  }

  .genre-grid,
  .page-genre-channels .genre-overview .genre-grid,
  .boundary-list,
  .error-path-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
    padding: 36px 20px 24px;
  }

  .footer-bottom {
    padding: 16px 20px 24px;
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 0 16px;
  }

  .brand-text {
    font-size: 15px;
  }

  .site-nav {
    padding-left: 16px;
    padding-right: 16px;
  }

  .inner-main {
    padding: 16px 16px 40px;
  }

  .page-header {
    margin-bottom: 24px;
    padding-bottom: 16px;
  }

  .page-title {
    font-size: 24px;
  }

  .hero-inner {
    padding: 32px 16px 28px;
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-media img {
    height: 200px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
  }

  .section-genres,
  .section-topics,
  .section-fields,
  .section-prepare,
  .section-boundary {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section {
    margin-bottom: 36px;
  }

  .section-head h2,
  .section-title,
  .section > h2,
  .guide-section h2,
  .error-paths h2 {
    font-size: 20px;
  }

  .genre-grid,
  .page-genre-channels .genre-overview .genre-grid,
  .topic-list,
  .topic-grid,
  .boundary-list,
  .error-path-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .genre-card,
  .topic-card,
  .boundary-item,
  .aside-block,
  .guide-step,
  .error-path-item,
  .scope-item {
    padding: 16px;
  }

  .section-topic-list .topic-card {
    padding: 0;
  }

  .topic-body {
    padding: 16px;
  }

  .topic-media img,
  .genre-figure img,
  .index-figure img,
  .guide-figure img,
  .boundary-media img {
    height: 180px;
  }

  .step-item {
    gap: 12px;
  }

  .step-body,
  .scope-item p {
    min-width: 0;
  }

  .related-links a {
    flex: 1 1 auto;
    justify-content: center;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 28px 16px 20px;
  }

  .footer-bottom {
    padding: 14px 16px 22px;
    flex-wrap: wrap;
  }

  .error-main {
    padding: 40px 16px 56px;
  }

  .error-actions .btn {
    flex: 1 1 auto;
  }
}