:root {
  --text: #1f2429;
  --text-soft: #5a636b;
  --accent: #0f5c62;
  --accent-soft: #e2ecec;
  --line: #e7e9ea;
  --bg-soft: #f6f7f7;
  --bg: #ffffff;
  --radius: 6px;
  --radius-sm: 4px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --container: 1180px;
  --reading: 720px;
  --aside: 260px;
  --gap: 40px;
}

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

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

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

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

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

a {
  color: var(--accent);
  text-decoration: none;
}

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

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

h1 {
  font-size: 32px;
  line-height: 1.3;
}

h2 {
  font-size: 22px;
  line-height: 1.4;
}

h3 {
  font-size: 18px;
  line-height: 1.4;
}

p {
  margin: 0 0 16px;
}

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

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

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

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

/* ============================================================
   layout — shell
   ============================================================ */

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

.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.inner-main {
  padding-top: 24px;
  padding-bottom: 64px;
}

.home-main {
  padding-bottom: 72px;
}

/* ============================================================
   header
   ============================================================ */

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

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

.brand {
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0;
}

.brand:hover {
  color: var(--accent);
  text-decoration: none;
}

.header-shortcuts {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
}

.header-shortcuts a {
  color: var(--text-soft);
  padding: 6px 0;
}

.header-shortcuts a:hover,
.header-shortcuts a.is-current {
  color: var(--accent);
}

.site-nav {
  border-top: 1px solid var(--line);
  background: var(--bg);
}

.nav-list {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-list li {
  display: block;
}

.nav-list a {
  display: block;
  padding: 13px 14px;
  font-size: 15px;
  color: var(--text);
  border-bottom: 2px solid transparent;
}

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

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

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  min-height: 44px;
}

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  position: relative;
}

.nav-toggle-bar + .nav-toggle-bar {
  margin-top: 4px;
}

.nav-toggle-text {
  font-size: 14px;
  color: var(--text-soft);
}

/* ============================================================
   footer
   ============================================================ */

.site-footer {
  margin-top: 64px;
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(4, minmax(140px, 1fr));
  gap: 32px;
}

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

.footer-name {
  font-size: 17px;
  font-weight: 600;
  margin: 0 0 10px;
}

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

.footer-title {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--text);
}

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

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

.footer-group a:hover {
  color: var(--accent);
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px 24px 32px;
  font-size: 13px;
  color: var(--text-soft);
  border-top: 1px solid var(--line);
}

/* ============================================================
   components — shared
   ============================================================ */

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

.section-head h2 {
  margin-bottom: 8px;
}

.section-note {
  font-size: 14px;
  color: var(--text-soft);
  margin: 0;
}

.section-note a {
  margin-right: 14px;
}

.section-lead,
.section-intro {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0 0 20px;
}

.section-lead strong {
  color: var(--text);
}

.btn-primary,
.btn-ghost {
  display: inline-block;
  padding: 11px 22px;
  font-size: 15px;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  min-height: 44px;
  line-height: 1.5;
}

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

.btn-primary:hover {
  background: #0c4a4f;
  border-color: #0c4a4f;
  color: #fff;
  text-decoration: none;
}

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

.btn-ghost:hover {
  background: var(--accent-soft);
  text-decoration: none;
}

.table-wrap,
.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
}

.field-table,
.data-table {
  min-width: 620px;
  font-size: 14px;
}

.field-table caption,
.data-table caption {
  text-align: left;
  padding: 14px 16px;
  font-size: 14px;
  color: var(--text-soft);
  border-bottom: 1px solid var(--line);
}

.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);
  line-height: 1.7;
}

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

.field-table tbody th,
.data-table tbody th {
  font-weight: 600;
  color: var(--text);
  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: 0;
}

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

/* ============================================================
   breadcrumb & page header (inner pages)
   ============================================================ */

.breadcrumb {
  font-size: 14px;
  color: var(--text-soft);
  padding: 4px 0 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumb-sep {
  color: #b8bec2;
}

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

.page-header {
  padding: 20px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 12px;
}

.page-description {
  font-size: 16px;
  color: var(--text-soft);
  margin: 0;
  max-width: 780px;
}

/* ============================================================
   layout — inner two column
   ============================================================ */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--reading)) minmax(220px, var(--aside));
  gap: var(--gap);
  align-items: start;
}

.layout-shell {
  grid-template-columns: minmax(0, 1fr) minmax(220px, var(--aside));
}

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

.page-aside,
.sidebar {
  min-width: 0;
  position: sticky;
  top: 24px;
  font-size: 14px;
}

.aside-title,
.sidebar-title {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--text);
}

.aside-toc,
.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-left: 2px solid var(--line);
  padding-left: 14px;
  margin-bottom: 24px;
}

.aside-toc a,
.sidebar-list a {
  color: var(--text-soft);
  display: block;
  line-height: 1.6;
}

.aside-toc a:hover,
.sidebar-list a:hover {
  color: var(--accent);
}

.aside-note {
  font-size: 13px;
  color: var(--text-soft);
  margin: 0;
  line-height: 1.75;
}

.sidebar-note {
  margin-top: 24px;
}

/* ============================================================
   pages — home
   ============================================================ */

.hero {
  display: grid;
  grid-template-columns: 58% 42%;
  gap: 40px;
  align-items: center;
  padding: 48px 0 56px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 56px;
}

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

.hero-eyebrow {
  font-size: 14px;
  color: var(--accent);
  margin: 0 0 14px;
}

.hero-text h1 {
  font-size: 32px;
  line-height: 1.3;
  margin: 0 0 18px;
}

.hero-desc {
  font-size: 16px;
  color: var(--text-soft);
  margin: 0 0 26px;
  max-width: 560px;
}

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

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

.hero-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.hero-media figcaption {
  font-size: 13px;
  color: var(--text-soft);
  margin-top: 10px;
  line-height: 1.7;
}

/* home — channels */

.channels {
  margin-bottom: 56px;
}

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

.channel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.channel-name h3 {
  margin: 0 0 6px;
}

.channel-tone {
  font-size: 14px;
  color: var(--text-soft);
  margin: 0;
}

.channel-focus p {
  font-size: 15px;
  color: var(--text);
  margin: 0 0 8px;
}

.channel-focus a {
  font-size: 14px;
}

/* home — playlists */

.playlists {
  margin-bottom: 56px;
}

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

.playlist-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.playlist-media {
  margin: 0;
}

.playlist-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.playlist-card h3,
.playlist-name {
  font-size: 17px;
  margin: 0;
}

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

.playlist-count {
  font-size: 13px;
  color: var(--text-soft);
  margin: 0;
  font-family: var(--font-mono);
}

.playlist-tag {
  align-self: flex-start;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 10px;
  border-radius: 999px;
}

/* home — field summary */

.field-summary {
  margin-bottom: 56px;
}

/* home — path overview */

.path-overview {
  margin-bottom: 56px;
}

.path-steps {
  border-top: 1px solid var(--line);
}

.path-step {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.path-step .step-index {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--accent);
  line-height: 1.4;
}

.path-step h3 {
  margin: 0 0 6px;
}

.path-step p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0 0 8px;
}

.path-step a {
  font-size: 14px;
}

/* home — updates */

.updates {
  margin-bottom: 24px;
}

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

.update-item {
  display: grid;
  grid-template-columns: 110px 140px minmax(0, 1fr);
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.update-item time {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-soft);
}

.update-scope {
  font-size: 14px;
  color: var(--accent);
}

.update-item p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
}

.updates-feedback {
  margin: 20px 0 0;
  font-size: 14px;
}

/* ============================================================
   pages — 题材频道
   ============================================================ */

.channel-overview,
.channel-sheet-map,
.tag-filter,
.channel-boundary {
  margin-bottom: 48px;
}

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

.channel-list .channel-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.channel-main h3 {
  margin: 0 0 6px;
}

.channel-tendency {
  font-size: 14px;
  color: var(--text-soft);
  margin: 0;
}

.channel-side p {
  font-size: 15px;
  color: var(--text);
  margin: 0 0 8px;
}

.channel-form {
  font-size: 14px;
  color: var(--text-soft);
  margin: 0;
}

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

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

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

.sheet-map-item p {
  font-size: 14px;
  color: var(--text-soft);
  margin: 0 0 8px;
  line-height: 1.75;
}

.sheet-map-link {
  margin: 0;
  font-size: 14px;
}

.tag-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.tag-chip {
  padding: 8px 16px;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
  color: var(--text);
  min-height: 44px;
  line-height: 1.5;
}

.tag-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tag-chip.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.tag-notes {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tag-notes li {
  font-size: 14px;
  color: var(--text-soft);
  padding-left: 16px;
  position: relative;
  line-height: 1.75;
}

.tag-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

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

.boundary-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  color: var(--text-soft);
  line-height: 1.75;
}

.boundary-more {
  margin: 18px 0 0;
  font-size: 14px;
}

.boundary-more a {
  margin-right: 16px;
}

.channel-figure {
  margin: 0 auto 48px;
  max-width: var(--container);
}

.channel-figure h2 {
  margin-bottom: 16px;
}

.channel-figure-item {
  margin: 0;
}

.channel-figure-item img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

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

/* ============================================================
   pages — 专题片单
   ============================================================ */

.playlist-overview,
.playlist-schedule,
.playlist-filter,
.playlist-updates,
.playlist-next {
  margin-bottom: 48px;
}

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

.playlist-channel {
  font-size: 13px;
  color: var(--text-soft);
  margin: 0;
}

.playlist-channel a {
  margin-right: 10px;
}

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

.schedule-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

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

.schedule-item p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
}

.tag-filter .tag-button {
  padding: 8px 16px;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
  color: var(--text);
  min-height: 44px;
  line-height: 1.5;
}

.tag-filter .tag-button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.tag-filter .tag-button.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.filter-note {
  font-size: 14px;
  color: var(--text-soft);
  margin: 16px 0 0;
}

.playlist-updates .update-item {
  display: block;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.playlist-updates .update-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.playlist-updates .update-item p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
}

.playlist-next p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
}

.playlist-next a {
  margin-right: 16px;
}

/* ============================================================
   pages — 条目字段说明
   ============================================================ */

.field-figure {
  margin: 0 0 40px;
}

.field-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

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

.section-field-table,
.section-writing-rules,
.section-missing,
.section-field-channel {
  margin-bottom: 48px;
}

.section-field-table p,
.section-writing-rules p,
.section-missing p,
.section-field-channel p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0 0 18px;
}

.rule-list,
.missing-list {
  border-top: 1px solid var(--line);
}

.rule-item,
.missing-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.rule-item h3,
.missing-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.rule-item p,
.missing-item p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
}

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

.channel-map-row {
  display: grid;
  grid-template-columns: minmax(120px, 180px) minmax(0, 1fr);
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.channel-map-key {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
}

.channel-map-row a {
  font-size: 15px;
}

/* ============================================================
   pages — 查阅路径
   ============================================================ */

.path-steps,
.path-roles,
.path-obstacles,
.path-feedback {
  margin-bottom: 48px;
}

.step-list {
  border-top: 1px solid var(--line);
  counter-reset: step;
}

.step-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.step-name {
  margin: 0 0 8px;
  font-size: 17px;
}

.step-do,
.step-basis {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0 0 8px;
}

.step-link {
  font-size: 14px;
}

.path-figure {
  margin: 28px 0 0;
}

.path-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

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

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

.role-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.role-name {
  margin: 0;
  font-size: 16px;
}

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

.role-link {
  font-size: 14px;
  margin-top: auto;
}

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

.obstacle-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.obstacle-name {
  margin: 0 0 6px;
  font-size: 16px;
}

.obstacle-fix {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
}

.path-feedback p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0 0 14px;
}

.feedback-link {
  font-size: 15px;
}

/* ============================================================
   pages — 收录边界与反馈
   ============================================================ */

.page-figure {
  margin: 0 0 40px;
}

.page-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

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

.section-included,
.section-excluded,
.section-misconception,
.section-correction {
  margin-bottom: 48px;
}

.section-included > p,
.section-excluded > p,
.section-misconception > p,
.section-correction > p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0 0 18px;
}

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

.scope-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

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

.scope-item p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
}

.scope-list-included .scope-item h3::before {
  content: "收录";
  display: inline-block;
  font-size: 12px;
  font-weight: 400;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 1px 8px;
  border-radius: 999px;
  margin-right: 10px;
  vertical-align: middle;
}

.scope-list-excluded .scope-item h3::before {
  content: "不收";
  display: inline-block;
  font-size: 12px;
  font-weight: 400;
  color: var(--text-soft);
  background: var(--bg-soft);
  padding: 1px 8px;
  border-radius: 999px;
  margin-right: 10px;
  vertical-align: middle;
}

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

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

.faq-item summary {
  padding: 16px 30px 16px 0;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  list-style: none;
  min-height: 44px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--accent);
  line-height: 1;
}

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

.faq-item p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
  padding: 0 0 18px;
  line-height: 1.85;
}

.correction-steps {
  border-top: 1px solid var(--line);
  counter-reset: correction;
  margin-bottom: 28px;
}

.correction-step {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.correction-step::before {
  counter-increment: correction;
  content: counter(correction);
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--accent);
  line-height: 1.6;
}

.correction-step h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.correction-step p {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0;
}

.correction-notes {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: var(--bg-soft);
}

.correction-notes h3 {
  margin: 0 0 12px;
  font-size: 16px;
}

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

.note-list li {
  font-size: 14px;
  color: var(--text-soft);
  padding-left: 16px;
  position: relative;
  line-height: 1.75;
}

.note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

.section-tail {
  margin: 24px 0 0;
  font-size: 14px;
}

.section-tail a {
  margin-right: 16px;
}

/* ============================================================
   pages — 404
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
}

.error-inner {
  max-width: 620px;
  text-align: center;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 64px;
  line-height: 1;
  color: var(--accent);
  margin: 0 0 16px;
}

.error-title {
  font-size: 28px;
  margin: 0 0 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--text-soft);
  margin: 0 0 12px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin: 28px 0 20px;
}

.error-btn {
  display: inline-block;
  padding: 11px 22px;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  min-height: 44px;
  line-height: 1.5;
}

.error-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

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

.error-btn-primary:hover {
  background: #0c4a4f;
  border-color: #0c4a4f;
  color: #fff;
}

.error-note {
  font-size: 14px;
  color: var(--text-soft);
  margin: 0;
}

/* ============================================================
   responsive — 1024px
   ============================================================ */

@media (max-width: 1024px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 32px;
    padding: 40px 0 48px;
    margin-bottom: 48px;
  }

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

  .page-aside,
  .sidebar {
    position: static;
    border-top: 1px solid var(--line);
    padding-top: 24px;
  }

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

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

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* ============================================================
   responsive — 768px
   ============================================================ */

@media (max-width: 768px) {
  body {
    font-size: 16px;
  }

  .site-main {
    padding: 0 18px;
  }

  .header-top {
    padding: 12px 18px;
    gap: 12px;
  }

  .header-shortcuts {
    display: none;
  }

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

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 18px 16px;
  }

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

  .nav-list a {
    padding: 13px 4px;
    border-bottom: 1px solid var(--line);
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .nav-list li:last-child a {
    border-bottom: 0;
  }

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

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

  .hero-text h1 {
    font-size: 26px;
  }

  .hero-media {
    order: 2;
  }

  .hero-text {
    order: 1;
  }

  .channel-row,
  .channel-list .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .playlist-grid,
  .playlist-overview .playlist-grid,
  .sheet-map-grid,
  .role-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .path-step {
    grid-template-columns: 36px minmax(0, 1fr);
    gap: 14px;
  }

  .update-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .update-item time {
    display: block;
  }

  .channel-map-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .correction-step {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 12px;
  }

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

  .page-header {
    padding: 16px 0 22px;
    margin-bottom: 32px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    padding: 36px 18px 24px;
  }

  .footer-copy {
    padding: 18px 18px 28px;
  }

  .error-main {
    padding: 56px 18px;
  }

  .error-code {
    font-size: 52px;
  }

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

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

/* ============================================================
   responsive — 480px
   ============================================================ */

@media (max-width: 480px) {
  .site-main {
    padding: 0 14px;
  }

  .header-top {
    padding: 10px 14px;
  }

  .brand {
    font-size: 17px;
  }

  .nav-list {
    padding: 6px 14px 14px;
  }

  .hero-text h1 {
    font-size: 23px;
  }

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

  .btn-primary,
  .btn-ghost {
    text-align: center;
  }

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

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 32px 14px 20px;
  }

  .footer-copy {
    padding: 16px 14px 26px;
  }

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

  .error-btn {
    text-align: center;
  }

  .error-code {
    font-size: 46px;
  }
}