:root {
  --ink: #0B0B0C;
  --paper: #FFFFFF;
  --paper-alt: #F3F3F0;
  --signal: #FF5A1F;
  --muted: #6B6B70;
  --line: #D9D9D4;
  --radius: 2px;
  --shell: 1180px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

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

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

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

body.site-body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-wrap: break-word;
}

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

a {
  color: var(--ink);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease;
}

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

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

p {
  margin: 0 0 14px;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.02em;
}

figure {
  margin: 0;
}

figcaption {
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
}

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

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

/* ============================================================
   layout · shell
   ============================================================ */

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

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand-mark {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--ink);
  white-space: nowrap;
  flex-shrink: 0;
}

.brand-mark:hover {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 6px;
  text-decoration-thickness: 1px;
}

.site-nav {
  flex: 1;
  min-width: 0;
}

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

.nav-item {
  position: relative;
}

.nav-item > a {
  display: inline-flex;
  align-items: center;
  height: 72px;
  padding: 0 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  border-bottom: 2px solid transparent;
  transition: border-color 160ms ease, color 160ms ease;
}

.nav-item > a:hover {
  border-bottom-color: var(--line);
}

.nav-item.is-current > a,
.nav-item > a.is-current {
  font-weight: 700;
  border-bottom-color: var(--signal);
}

.header-helper {
  flex-shrink: 0;
  font-size: 13px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  white-space: nowrap;
}

.header-helper:hover {
  border-color: var(--signal);
  color: var(--signal);
}

.menu-toggle {
  display: none;
  width: 48px;
  height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  position: relative;
  flex-shrink: 0;
}

.menu-toggle::before,
.menu-toggle::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  height: 2px;
  background: var(--ink);
}

.menu-toggle::before {
  top: 19px;
  box-shadow: 0 8px 0 var(--ink);
}

.menu-toggle::after {
  bottom: 19px;
  opacity: 0;
}

.menu-toggle[aria-expanded="true"]::before {
  top: 23px;
  box-shadow: none;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"]::after {
  bottom: 23px;
  opacity: 1;
  transform: rotate(-45deg);
}

.nav-panel {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 460px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: none;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 24px;
  z-index: 40;
}

.nav-item.has-panel:hover .nav-panel,
.nav-item.has-panel:focus-within .nav-panel {
  display: grid;
}

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

.panel-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.panel-col a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--ink);
}

.panel-col a:hover {
  color: var(--signal);
}

.mobile-nav {
  display: none;
}

.site-main {
  display: block;
}

.inner-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 72px;
}

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

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr) 1.4fr;
  gap: 32px;
}

.footer-brand-name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}

.footer-brand-desc {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.footer-group-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

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

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

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

.footer-note p {
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0 0 8px;
}

.footer-note p:last-child {
  margin-bottom: 0;
}

.footer-bottom {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ============================================================
   layout · inner page shell
   ============================================================ */

.page-head {
  padding: 40px 0 24px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.page-summary {
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 860px;
  margin: 0 0 16px;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0;
}

.page-meta .meta-label {
  color: var(--muted);
}

.page-meta .meta-value,
.page-meta .meta-item,
.page-meta time {
  color: var(--ink);
}

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

.page-header {
  margin-bottom: 28px;
}

.page-title {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 20px;
}

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

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

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

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

.page-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

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

.page-layout .toc {
  grid-column: 1;
  grid-row: 1;
}

.page-layout .main-content,
.page-layout .page-body,
.page-layout .main {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
}

.toc {
  position: sticky;
  top: 24px;
  align-self: start;
  font-size: 14px;
  border-left: 1px solid var(--line);
  padding-left: 20px;
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}

.toc-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc-list a {
  display: block;
  padding: 6px 8px;
  margin-left: -8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  border-left: 2px solid transparent;
}

.toc-list a:hover {
  color: var(--ink);
  border-left-color: var(--line);
}

.toc-list a.is-active {
  color: var(--ink);
  font-weight: 600;
  border-left-color: var(--signal);
}

.toc-progress {
  height: 2px;
  background: var(--line);
  margin-bottom: 16px;
  overflow: hidden;
}

.toc-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--signal);
  transition: width 120ms linear;
}

.toc-toggle {
  display: none;
}

.toc-note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.toc-note a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
}

.main-content,
.page-body,
.main {
  min-width: 0;
  max-width: 72ch;
}

/* ============================================================
   components · shared
   ============================================================ */

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--signal);
  padding-bottom: 2px;
  transition: color 160ms ease;
}

.text-link::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
}

.text-link:hover {
  color: var(--signal);
}

.link-arrow {
  font-family: var(--font-mono);
  color: var(--signal);
  margin-right: 4px;
}

.data-table {
  width: 100%;
  font-size: 14px;
  line-height: 1.7;
  border-top: 1px solid var(--ink);
  margin: 20px 0 8px;
}

.data-table caption {
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  padding-bottom: 10px;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.data-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--muted);
  background: var(--paper-alt);
  border-bottom: 1px solid var(--line);
}

.data-table tbody tr:nth-child(even) {
  background: var(--paper-alt);
}

.data-table tbody tr:hover {
  background: #EDEDE8;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin: 20px 0;
  counter-reset: step;
}

.step-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--signal);
  font-weight: 600;
}

.step-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

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

.step-body p {
  margin: 0 0 6px;
  font-size: 15px;
  line-height: 1.75;
}

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

.step-action {
  font-size: 15px;
  line-height: 1.75;
  margin: 0 0 6px;
}

.step-standard,
.step-check {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.related-links {
  margin: 48px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
}

.related-links-label,
.related-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}

.related-links h2.related-title {
  flex-basis: 100%;
  margin-bottom: 4px;
}

.related-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
}

.related-links-item,
.related-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  position: relative;
  padding-left: 16px;
}

.related-links-item::before,
.related-links li > a::before {
  content: "→";
  position: absolute;
  left: 0;
  font-family: var(--font-mono);
  color: var(--signal);
}

.related-links a:hover {
  color: var(--signal);
}

.media-figure,
.channel-figure,
.field-figure,
.content-figure,
.editorial-figure {
  margin: 20px 0;
}

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

.media-figure figcaption,
.channel-figure figcaption,
.field-figure figcaption,
.content-figure figcaption,
.editorial-figure figcaption {
  margin-top: 8px;
}

.inline-note {
  font-size: 14px;
  color: var(--muted);
  margin-top: 12px;
}

.inline-note a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
}

.status-live,
.sr-status {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ============================================================
   pages · home
   ============================================================ */

.home-main {
  display: block;
}

.scene-hero {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px 24px 48px;
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 48px;
  align-items: start;
}

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

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 16px;
}

.scene-hero h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.01em;
  margin: 0 0 20px;
}

.hero-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 14px;
  max-width: 34em;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 12px 24px;
  background: var(--ink);
  color: var(--paper);
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background 160ms ease;
}

.hero-cta:hover {
  background: var(--signal);
  color: var(--paper);
}

.hero-cta::after {
  content: "→";
  font-family: var(--font-mono);
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scene-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 24px 22px;
  background: var(--paper);
  min-height: 132px;
  position: relative;
  transition: background 160ms ease, transform 160ms ease;
}

.scene-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  transition: background 160ms ease;
}

.scene-card:hover {
  background: var(--paper-alt);
  transform: translateY(-2px);
}

.scene-card:hover::before {
  background: var(--signal);
}

.scene-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.scene-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.scene-desc {
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.cover-band {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.cover-figure {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.cover-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 20px 28px 22px;
  background: rgba(11, 11, 12, 0.82);
  color: var(--paper);
}

.cover-issue {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #FFB79B;
  margin: 0 0 10px;
}

.cover-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 12px;
}

.cover-tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 12px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius);
  color: var(--paper);
}

.cover-tag:hover {
  border-color: var(--signal);
  color: var(--signal);
}

.cover-title {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
  margin: 0;
}

.three-panel {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: 4fr 5fr 3fr;
  gap: 40px;
  border-top: 1px solid var(--line);
}

.panel-cover,
.panel-tracks,
.panel-editorial {
  min-width: 0;
}

.panel-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 10px;
}

.panel-heading {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 18px;
}

.panel-cover-figure {
  margin: 0 0 14px;
}

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

.panel-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0 0 16px;
}

.track-list {
  border-top: 1px solid var(--ink);
}

.track-row {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) auto auto auto;
  gap: 10px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  transition: background 160ms ease;
}

.track-row:hover {
  background: var(--paper-alt);
}

.track-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.track-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.track-channel {
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
}

.track-duration {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
}

.track-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 6px;
  border: 1px solid var(--signal);
  border-radius: var(--radius);
  color: var(--signal);
  white-space: nowrap;
}

.track-foot {
  font-size: 13px;
  color: var(--muted);
  margin: 14px 0 0;
}

.editorial-body p {
  font-size: 15px;
  line-height: 1.85;
  margin: 0 0 14px;
}

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

.editorial-figure {
  margin-top: 18px;
}

.channel-tags {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px;
  border-top: 1px solid var(--line);
}

.section-heading {
  font-size: 26px;
  font-weight: 800;
  line-height: 1.3;
  margin: 0 0 10px;
}

.section-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 24px;
  max-width: 62em;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.channel-pill {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  transition: border-color 160ms ease, color 160ms ease;
}

.channel-pill:hover {
  border-color: var(--signal);
  color: var(--signal);
}

.collection-preview {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px;
  border-top: 1px solid var(--line);
}

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

.preview-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 160ms ease, border-color 160ms ease;
}

.preview-card:hover {
  transform: translateY(-2px);
  border-color: var(--ink);
}

.preview-group {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0;
}

.preview-title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  margin: 0;
}

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

.preview-hint {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  margin: 0 0 8px;
}

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

.label-brief {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px;
  border-top: 1px solid var(--line);
}

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

.brief-fields,
.brief-verify {
  min-width: 0;
}

.brief-subtitle {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 16px;
  padding-left: 12px;
  border-left: 2px solid var(--signal);
}

.field-list {
  border-top: 1px solid var(--line);
  margin-bottom: 16px;
}

.field-list li {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr);
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.field-name {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink);
  font-weight: 600;
}

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

.upkeep-bar {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-alt);
}

.upkeep-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
  flex: 1 1 320px;
}

/* ============================================================
   pages · channels
   ============================================================ */

.channel-overview,
.channel-detail,
.channel-mapping,
.channel-picking {
  margin-bottom: 48px;
  scroll-margin-top: 24px;
}

.channel-overview > h2,
.channel-detail > h2,
.channel-mapping > h2,
.channel-picking > h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 12px;
  padding-left: 12px;
  border-left: 2px solid var(--signal);
}

.channel-overview > p,
.channel-detail > p,
.channel-mapping > p,
.channel-picking > p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 20px;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.channel-card {
  background: var(--paper);
  padding: 22px 20px;
  min-width: 0;
  transition: background 160ms ease;
}

.channel-card:hover {
  background: var(--paper-alt);
}

.channel-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 12px;
}

.channel-card-field {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 8px;
  padding: 6px 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.65;
}

.channel-card-field .field-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding-top: 2px;
}

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

.detail-group > h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--ink);
}

.detail-item {
  padding: 16px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 24px;
}

.detail-item h4 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
}

.detail-item p {
  font-size: 14.5px;
  line-height: 1.8;
  margin: 0 0 8px;
}

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

.detail-link a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
}

.channel-table {
  font-size: 13.5px;
}

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

.picking-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 18px;
  min-width: 0;
}

.picking-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 10px;
}

.picking-method {
  font-size: 14px;
  line-height: 1.75;
  margin: 0 0 10px;
}

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

/* ============================================================
   pages · collections
   ============================================================ */

.section {
  margin-bottom: 48px;
  scroll-margin-top: 24px;
}

.section > h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 12px;
  padding-left: 12px;
  border-left: 2px solid var(--signal);
}

.section > p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 20px;
}

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

.catalog-group {
  min-width: 0;
}

.catalog-group h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 6px;
}

.group-note {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 12px;
}

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

.catalog-list li {
  border-bottom: 1px solid var(--line);
  padding: 9px 0;
}

.catalog-list a {
  font-size: 14px;
  color: var(--ink);
}

.catalog-list a:hover {
  color: var(--signal);
}

.catalog-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-top: 2px;
}

.sheet-card {
  border-top: 1px solid var(--ink);
  padding: 28px 0;
  scroll-margin-top: 24px;
}

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

.sheet-cover {
  margin: 0 0 18px;
}

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

.sheet-cover figcaption {
  margin-top: 8px;
}

.sheet-card > h3 {
  font-size: 21px;
  font-weight: 700;
  margin: 0 0 10px;
}

.sheet-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin: 0 0 20px;
}

.sheet-meta .meta-value {
  color: var(--ink);
}

.sheet-columns {
  display: grid;
  grid-template-columns: 4fr 5fr 3fr;
  gap: 28px;
}

.sheet-col {
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.8;
}

.sheet-col h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 10px;
}

.sheet-reason p,
.sheet-advice p {
  margin: 0 0 10px;
}

.sheet-ordered {
  counter-reset: sheet-order;
}

.sheet-ordered li {
  position: relative;
  padding: 8px 0 8px 26px;
  border-bottom: 1px solid var(--line);
  counter-increment: sheet-order;
  font-size: 14px;
  line-height: 1.7;
}

.sheet-ordered li::before {
  content: counter(sheet-order, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.method-item {
  background: var(--paper);
  padding: 22px 20px;
  min-width: 0;
}

.method-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 10px;
}

.method-item p {
  font-size: 14px;
  line-height: 1.75;
  margin: 0 0 8px;
}

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

.section-schedule p {
  font-size: 15px;
  line-height: 1.85;
  margin: 0 0 14px;
}

.section-schedule a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
}

/* ============================================================
   pages · labeling
   ============================================================ */

.content-block {
  margin-bottom: 48px;
  scroll-margin-top: 24px;
}

.content-block > h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 12px;
  padding-left: 12px;
  border-left: 2px solid var(--signal);
}

.content-block > p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 20px;
}

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

.value-group {
  min-width: 0;
}

.value-group h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 8px;
}

.value-group > p {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 12px;
}

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

.value-list li {
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
}

.misread-list {
  border-top: 1px solid var(--ink);
}

.misread-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.misread-case {
  font-size: 14.5px;
  line-height: 1.8;
}

.misread-case .fix-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 4px;
}

.misread-fix {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.misread-fix .fix-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 4px;
}

/* ============================================================
   pages · help
   ============================================================ */

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

.step-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  min-width: 0;
}

.step-card .step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--signal);
  margin-bottom: 10px;
}

.step-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 10px;
}

.step-action {
  font-size: 14px;
  line-height: 1.75;
  margin: 0 0 8px;
}

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

.path-list {
  border-top: 1px solid var(--line);
  margin: 20px 0 0;
}

.path-list li {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.path-node {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink);
  font-weight: 600;
}

.path-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

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

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--signal);
  flex-shrink: 0;
  transition: transform 160ms ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

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

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

.faq-body p {
  font-size: 14.5px;
  line-height: 1.85;
  margin: 0 0 12px;
}

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

.tip-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.tip-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
}

.tip-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--signal);
  font-weight: 600;
}

.tip-list p {
  font-size: 14.5px;
  line-height: 1.75;
  margin: 0;
}

/* ============================================================
   pages · upkeep
   ============================================================ */

.section-lead {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 20px;
}

.format-block {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px;
  background: var(--paper-alt);
}

.format-list {
  margin: 0 0 18px;
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 0;
}

.format-list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink);
  font-weight: 600;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.format-list dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.format-list dt:first-of-type,
.format-list dt:first-of-type + dd {
  border-top: none;
}

.format-sample {
  font-size: 14px;
  line-height: 1.8;
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.format-sample .meta-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--signal);
  margin-right: 8px;
}

.log-list {
  border-top: 1px solid var(--ink);
}

.log-item {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.log-date {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.log-text {
  font-size: 14.5px;
  line-height: 1.75;
}

/* ============================================================
   pages · about
   ============================================================ */

.content-section {
  margin-bottom: 48px;
  scroll-margin-top: 24px;
}

.content-section > h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 0 0 12px;
  padding-left: 12px;
  border-left: 2px solid var(--signal);
}

.content-section > p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 20px;
}

.point-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.point-list li {
  font-size: 14.5px;
  line-height: 1.8;
  padding-left: 16px;
  position: relative;
}

.point-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--signal);
}

.point-list strong {
  font-weight: 700;
  color: var(--ink);
}

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

.scope-col {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  min-width: 0;
}

.scope-col-yes {
  border-top: 2px solid var(--signal);
}

.scope-col-no {
  border-top: 2px solid var(--ink);
  background: var(--paper-alt);
}

.scope-col h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 12px;
}

.scope-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scope-col li {
  font-size: 14px;
  line-height: 1.75;
  padding-left: 16px;
  position: relative;
}

.scope-col li::before {
  content: "·";
  position: absolute;
  left: 2px;
  top: 0;
  color: var(--muted);
  font-weight: 700;
}

.scope-col-yes li::before {
  color: var(--signal);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.principle-item {
  background: var(--paper);
  padding: 22px 20px;
  min-width: 0;
}

.principle-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 10px;
}

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

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

.entry-group {
  min-width: 0;
}

.entry-group h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 12px;
}

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

.entry-list li {
  border-bottom: 1px solid var(--line);
  padding: 10px 0;
}

.entry-list a {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
}

.entry-list a:hover {
  color: var(--signal);
}

.entry-desc {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  margin-top: 2px;
}

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

.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 96px 24px 120px;
}

.error-block {
  max-width: 640px;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--signal);
  margin: 0 0 16px;
}

.error-block h1 {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 16px;
}

.error-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 28px;
}

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

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
}

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

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

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

.btn-secondary:hover {
  border-color: var(--signal);
  color: var(--signal);
}

.error-hint {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
}

.error-hint a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--signal);
  text-underline-offset: 3px;
  margin-right: 12px;
}

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

@media (max-width: 1024px) {
  .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 32px;
  }

  .scene-hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 40px;
  }

  .scene-hero h1 {
    font-size: 38px;
  }

  .three-panel {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .panel-editorial {
    grid-column: 1 / -1;
  }

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

  .footer-brand,
  .footer-note {
    grid-column: span 3;
  }

  .sheet-columns {
    grid-template-columns: 1fr 1fr;
  }

  .sheet-advice {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .nav-panel {
    min-width: 420px;
    padding: 16px 18px;
    gap: 18px;
  }

  .preview-grid,
  .catalog-groups,
  .value-groups,
  .picking-list,
  .step-cards {
    grid-template-columns: 1fr;
  }

  .method-grid,
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .channel-grid {
    grid-template-columns: 1fr;
  }

  .brief-grid,
  .scope-compare,
  .entry-groups {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .misread-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
    gap: 16px;
    padding: 0 16px;
  }

  .site-nav {
    display: none;
  }

  .header-helper {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .mobile-nav {
    display: block;
    border-top: 1px solid var(--line);
    background: var(--paper);
    padding: 8px 16px 20px;
    max-height: calc(100vh - 64px);
    overflow-y: auto;
  }

  .mobile-nav[hidden] {
    display: none;
  }

  .mobile-nav ul {
    display: flex;
    flex-direction: column;
  }

  .mobile-nav li a {
    display: flex;
    align-items: center;
    min-height: 48px;
    font-size: 15px;
    color: var(--ink);
    border-left: 2px solid transparent;
    padding-left: 12px;
  }

  .mobile-nav li a:hover {
    color: var(--signal);
  }

  .mobile-nav li a.is-current,
  .mobile-nav li a[aria-current="page"] {
    border-left-color: var(--signal);
    font-weight: 700;
  }

  .mobile-group-title {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    padding: 16px 0 6px 12px;
  }

  .inner-main {
    padding: 0 16px 56px;
  }

  .page-head {
    padding: 28px 0 20px;
    margin-bottom: 24px;
  }

  .page-summary {
    font-size: 15.5px;
    line-height: 1.75;
  }

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

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

  .page-layout,
  .page-layout.sidebar-left {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  .page-layout .main-content,
  .page-layout .page-body,
  .page-layout .main {
    order: 1;
    width: 100%;
    max-width: none;
  }

  .page-layout .toc {
    order: 2;
    position: static;
    width: 100%;
    border-left: none;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px 16px;
    background: var(--paper-alt);
  }

  .toc-title {
    margin-bottom: 10px;
  }

  .toc-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .toc-list a {
    margin-left: 0;
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--paper);
    font-size: 13px;
  }

  .toc-list a.is-active {
    border-color: var(--signal);
    border-left-color: var(--signal);
  }

  .toc-toggle {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    margin-bottom: 10px;
    padding: 0 14px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--paper);
    font-size: 13px;
    font-weight: 600;
  }

  .toc-toggle::after {
    content: "▾";
    margin-left: 8px;
    font-size: 11px;
    color: var(--signal);
  }

  .toc-toggle[aria-expanded="false"]::after {
    content: "▸";
  }

  .toc-progress {
    margin-bottom: 12px;
  }

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

  .data-table {
    font-size: 13px;
  }

  .data-table th,
  .data-table td {
    padding: 10px 10px;
  }

  .table-wrap .data-table {
    min-width: 520px;
  }

  .scene-hero {
    padding: 32px 16px 36px;
    gap: 28px;
  }

  .scene-hero h1 {
    font-size: 28px;
    line-height: 1.3;
  }

  .hero-lead {
    font-size: 15.5px;
  }

  .scene-grid {
    grid-template-columns: 1fr;
  }

  .scene-card {
    min-height: 0;
    padding: 18px 18px;
  }

  .cover-band {
    padding: 0 16px 36px;
  }

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

  .cover-caption {
    position: static;
    background: var(--ink);
    padding: 16px 18px 18px;
  }

  .cover-title {
    font-size: 17px;
  }

  .three-panel {
    grid-template-columns: 1fr;
    padding: 36px 16px;
    gap: 36px;
  }

  .panel-editorial {
    grid-column: auto;
  }

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

  .track-row {
    grid-template-columns: 28px minmax(0, 1fr) auto;
    grid-template-areas:
      "num title badge"
      "num meta meta";
    gap: 2px 10px;
    padding: 12px 0;
  }

  .track-num {
    grid-area: num;
    align-self: start;
    padding-top: 3px;
  }

  .track-title {
    grid-area: title;
    white-space: normal;
  }

  .track-channel {
    grid-area: meta;
    font-size: 12px;
  }

  .track-duration {
    grid-area: meta;
    justify-self: end;
  }

  .track-badge {
    grid-area: badge;
    align-self: start;
  }

  .channel-tags,
  .collection-preview,
  .label-brief {
    padding: 36px 16px;
  }

  .section-heading {
    font-size: 22px;
  }

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

  .channel-pill {
    flex-shrink: 0;
  }

  .preview-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .field-list li {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 10px;
  }

  .upkeep-bar {
    padding: 20px 16px;
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 36px 16px 24px;
    gap: 24px;
  }

  .footer-brand,
  .footer-note {
    grid-column: span 2;
  }

  .footer-bottom {
    padding: 14px 16px 20px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .channel-overview > h2,
  .channel-detail > h2,
  .channel-mapping > h2,
  .channel-picking > h2,
  .section > h2,
  .content-block > h2,
  .content-section > h2 {
    font-size: 20px;
  }

  .channel-card-field {
    grid-template-columns: 68px minmax(0, 1fr);
  }

  .picking-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .sheet-columns {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .sheet-advice {
    grid-column: auto;
  }

  .sheet-cover img {
    aspect-ratio: 4 / 3;
  }

  .method-grid,
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .step-cards {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .path-list li,
  .log-item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 12px;
  }

  .format-list {
    grid-template-columns: 108px minmax(0, 1fr);
  }

  .format-block {
    padding: 20px 16px;
  }

  .scope-compare,
  .entry-groups {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .misread-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .related-links {
    margin-top: 36px;
    gap: 10px 20px;
  }

  .error-main {
    padding: 64px 16px 80px;
  }

  .error-block h1 {
    font-size: 30px;
  }
}

@media (max-width: 480px) {
  body.site-body {
    font-size: 15.5px;
    line-height: 1.75;
  }

  .header-inner {
    height: 60px;
  }

  .brand-mark {
    font-size: 17px;
  }

  .scene-hero h1 {
    font-size: 25px;
  }

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

  .track-row {
    grid-template-columns: 26px minmax(0, 1fr) auto;
  }

  .data-table th,
  .data-table td {
    padding: 9px 8px;
  }

  .table-wrap .data-table {
    min-width: 460px;
  }

  .field-list li {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .path-list li,
  .log-item,
  .format-list {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .format-list dt {
    border-top: none;
    padding-bottom: 0;
  }

  .format-list dd {
    padding-top: 2px;
  }

  .step-item {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 10px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-brand,
  .footer-note {
    grid-column: auto;
  }

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

  .btn-primary,
  .btn-secondary {
    justify-content: center;
  }
}

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

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

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

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