:root {
  --color-ink: #111111;
  --color-body: #2c2c2c;
  --color-muted: #4a4a4a;
  --color-soft: #8a8a8a;
  --color-line: #e6e6e6;
  --color-line-strong: #d2d2d2;
  --color-surface: #f5f5f5;
  --color-page: #ffffff;
  --color-action: #1f1f1f;
  --color-action-hover: #000000;
  --font-head: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --width-shell: 1120px;
  --width-read: 760px;
  --gutter: 24px;
  --radius: 6px;
  --shadow-soft: 0 1px 2px rgba(17, 17, 17, 0.06);
}

* {
  box-sizing: border-box;
}

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

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--color-page);
  color: var(--color-body);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

h1 {
  font-size: 30px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 17px;
}

p {
  margin: 0;
}

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

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

a:hover {
  color: #000000;
}

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

figure {
  margin: 0;
}

time {
  font-style: normal;
}

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

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

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

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

.site-header {
  border-bottom: 1px solid var(--color-line);
  background-color: var(--color-page);
  position: sticky;
  top: 0;
  z-index: 30;
}

.header-inner {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

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

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

.site-footer {
  border-top: 1px solid var(--color-line);
  background-color: var(--color-surface);
  color: var(--color-muted);
  font-size: 14px;
}

.footer-inner {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 44px var(--gutter) 28px;
  display: grid;
  grid-template-columns: minmax(240px, 1.4fr) minmax(140px, 1fr) minmax(140px, 1fr);
  gap: 32px 40px;
}

.footer-boundary {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 0 var(--gutter) 20px;
}

.footer-boundary p {
  padding-top: 18px;
  border-top: 1px solid var(--color-line-strong);
  color: var(--color-soft);
  font-size: 13px;
  line-height: 1.7;
}

.footer-bottom {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 0 var(--gutter) 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-copy {
  color: var(--color-soft);
  font-size: 13px;
}

.back-top {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 4px;
  color: var(--color-muted);
  font-size: 13px;
  border-bottom: 1px solid var(--color-line-strong);
}

.back-top:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-ink);
}

/* ===== components: header / nav ===== */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--color-ink);
}

.brand-mark {
  width: 26px;
  height: 26px;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius);
  background-color: var(--color-ink);
  box-shadow: inset 0 0 0 5px var(--color-page);
  flex: 0 0 auto;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li {
  display: flex;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  color: var(--color-muted);
  font-size: 15px;
  border-radius: var(--radius);
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-line-strong);
}

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

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  background-color: var(--color-page);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle:hover {
  border-color: var(--color-ink);
}

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

/* ===== components: buttons ===== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border-radius: var(--radius);
  border: 1px solid var(--color-action);
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
}

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

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

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

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

/* ===== components: breadcrumb / page header ===== */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 22px 0 0;
  font-size: 13px;
  color: var(--color-soft);
}

.breadcrumb a {
  color: var(--color-muted);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-line-strong);
}

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

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

.page-header {
  padding: 18px 0 30px;
  border-bottom: 1px solid var(--color-line);
}

.page-title {
  font-size: 30px;
  font-weight: 600;
  color: var(--color-ink);
}

.page-description {
  margin-top: 14px;
  max-width: 62ch;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.8;
}

/* ===== components: shared section pieces ===== */

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

.section-title {
  font-size: 22px;
  color: var(--color-ink);
}

.section-desc {
  margin-top: 12px;
  max-width: 64ch;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.section-lead {
  margin-top: 12px;
  max-width: 64ch;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.section-intro {
  margin-top: 12px;
  max-width: 64ch;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.subsection-title {
  margin-top: 26px;
  margin-bottom: 10px;
  font-size: 17px;
  color: var(--color-ink);
}

.section {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.section:last-of-type {
  border-bottom: 0;
}

.section-media,
.scene-figure,
.entry-figure,
.guide-figure,
.about-figure {
  margin-top: 28px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-surface);
}

.section-media img,
.scene-figure img,
.entry-figure img,
.guide-figure img,
.about-figure img {
  width: 100%;
  height: clamp(200px, 34vw, 340px);
  object-fit: cover;
  object-position: center;
}

.section-caption,
.scene-figure figcaption,
.entry-figure figcaption,
.guide-figure figcaption,
.about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--color-line);
  color: var(--color-soft);
  font-size: 13px;
  line-height: 1.7;
}

/* ===== components: footer ===== */

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

.footer-logo {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
}

.footer-desc {
  margin-top: 12px;
  max-width: 40ch;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.8;
}

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

.footer-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--color-muted);
  font-size: 14px;
  border-bottom: 1px solid transparent;
}

.footer-list a:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-line-strong);
}

/* ===== pages: home ===== */

.home-main {
  width: 100%;
}

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

.hero-inner {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 56px var(--gutter) 52px;
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(300px, 0.92fr);
  gap: 44px;
  align-items: center;
}

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

.hero-eyebrow {
  font-size: 13px;
  color: var(--color-soft);
  border-left: 2px solid var(--color-ink);
  padding-left: 10px;
}

.hero-title {
  margin-top: 16px;
  font-size: 34px;
  line-height: 1.3;
  color: var(--color-ink);
}

.hero-lead {
  margin-top: 18px;
  max-width: 46ch;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.85;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-media {
  min-width: 0;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-page);
  box-shadow: var(--shadow-soft);
}

.hero-media img {
  width: 100%;
  height: clamp(240px, 30vw, 360px);
  object-fit: cover;
  object-position: center;
}

.hero-caption {
  padding: 12px 16px;
  border-top: 1px solid var(--color-line);
  color: var(--color-soft);
  font-size: 13px;
  line-height: 1.7;
}

.scene-overview {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 52px var(--gutter) 48px;
  border-bottom: 1px solid var(--color-line);
}

.scene-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0 32px;
  border-top: 1px solid var(--color-line);
}

.scene-item {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.scene-name {
  font-size: 17px;
  color: var(--color-ink);
}

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

.scene-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  color: var(--color-ink);
  font-size: 14px;
  white-space: nowrap;
}

.scene-link:hover {
  border-color: var(--color-ink);
  background-color: var(--color-surface);
}

.scene-footnote {
  margin-top: 20px;
  color: var(--color-soft);
  font-size: 13px;
  line-height: 1.8;
}

.inclusion-summary {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 52px var(--gutter) 48px;
  border-bottom: 1px solid var(--color-line);
}

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

.inclusion-item {
  padding: 18px 0 18px 22px;
  border-bottom: 1px solid var(--color-line);
  position: relative;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.inclusion-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 27px;
  width: 8px;
  height: 1px;
  background-color: var(--color-ink);
}

.inclusion-summary .section-media {
  margin-top: 32px;
}

.browse-path {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 52px var(--gutter) 48px;
  border-bottom: 1px solid var(--color-line);
}

.path-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 22px 30px;
}

.path-item {
  display: flex;
  gap: 14px;
  padding: 20px 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-page);
}

.path-num {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--color-ink);
  color: var(--color-ink);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
}

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

.path-title {
  font-size: 16px;
  color: var(--color-ink);
}

.path-text {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.75;
}

.path-more {
  margin-top: 24px;
  font-size: 15px;
}

.path-more a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-ink);
  font-weight: 600;
  border-bottom: 1px solid var(--color-ink);
}

.update-record {
  max-width: var(--width-shell);
  margin: 0 auto;
  padding: 52px var(--gutter) 56px;
}

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

.record-item {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 8px 28px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

.record-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.record-date {
  color: var(--color-soft);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.record-type {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius);
  color: var(--color-muted);
  font-size: 12px;
}

.record-text {
  min-width: 0;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.record-more {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: 15px;
}

.record-more a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line-strong);
}

.record-more a:hover {
  border-bottom-color: var(--color-ink);
}

/* ===== pages: scenes ===== */

.scene-groups {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.scene-group-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
}

.scene-group {
  padding: 22px 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-page);
}

.scene-group .scene-name {
  font-size: 17px;
}

.scene-group .scene-scope {
  margin-top: 10px;
}

.scene-tip {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line);
  color: var(--color-soft);
  font-size: 13px;
  line-height: 1.75;
}

.scene-entries {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.scene-entry-block {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--color-line);
}

.scene-entry-heading {
  font-size: 17px;
  color: var(--color-ink);
}

.scene-entry-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
}

.scene-entry-item {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) 96px minmax(0, 1.6fr);
  gap: 6px 20px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-line);
}

.entry-link {
  min-width: 0;
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 600;
  border-bottom: 1px solid transparent;
}

.entry-link:hover {
  border-bottom-color: var(--color-ink);
}

.entry-scene {
  color: var(--color-soft);
  font-size: 13px;
}

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

.scene-tips {
  padding: 40px 0 8px;
}

.scene-tip-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-line);
}

.scene-tip-item {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line);
}

.tip-index {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  color: var(--color-ink);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
}

.tip-text {
  min-width: 0;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

/* ===== pages: listing ===== */

.entry-section {
  padding: 40px 0;
}

.entry-list {
  margin-top: 28px;
  border-top: 1px solid var(--color-line);
}

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

.entry-name {
  font-size: 17px;
  color: var(--color-ink);
}

.entry-item .entry-scene {
  margin-top: 8px;
}

.entry-item .entry-note {
  margin-top: 8px;
  max-width: 68ch;
}

.entry-more {
  margin-top: 22px;
  font-size: 15px;
}

.entry-more a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-ink);
  font-weight: 600;
  border-bottom: 1px solid var(--color-ink);
}

.field-section {
  padding: 40px 0;
}

.field-table {
  width: 100%;
  margin-top: 26px;
  border-collapse: collapse;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 15px;
}

.field-caption {
  caption-side: top;
  padding: 0 0 12px;
  text-align: left;
  color: var(--color-soft);
  font-size: 13px;
}

.field-table th,
.field-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
  line-height: 1.75;
}

.field-table thead th {
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-weight: 600;
  font-size: 14px;
}

.field-table tbody th {
  width: 34%;
  color: var(--color-ink);
  font-weight: 600;
  background-color: var(--color-page);
}

.field-table tbody td {
  color: var(--color-muted);
}

.field-table tbody tr:last-child th,
.field-table tbody tr:last-child td {
  border-bottom: 0;
}

.tips-section {
  padding: 40px 0;
}

.tips-list {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.tips-item {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-page);
}

.tips-title {
  font-size: 16px;
  color: var(--color-ink);
}

.tips-text {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.75;
}

.return-path {
  padding: 32px 0 0;
  border-top: 1px solid var(--color-line);
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.return-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-ink);
  font-size: 15px;
  border-bottom: 1px solid var(--color-line-strong);
}

.return-link:hover {
  border-bottom-color: var(--color-ink);
}

/* ===== pages: guide ===== */

.guide-steps {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.step-list {
  margin-top: 28px;
  border-top: 1px solid var(--color-line);
  counter-reset: step;
}

.step-item {
  padding: 22px 0;
  border-bottom: 1px solid var(--color-line);
}

.step-title {
  font-size: 17px;
  color: var(--color-ink);
}

.step-text {
  margin-top: 10px;
  max-width: 66ch;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.step-result {
  margin-top: 10px;
  padding-left: 14px;
  border-left: 2px solid var(--color-line-strong);
  color: var(--color-soft);
  font-size: 14px;
  line-height: 1.75;
}

.scope-notes {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.note-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-line);
}

.note-item {
  padding: 14px 0 14px 20px;
  border-bottom: 1px solid var(--color-line);
  position: relative;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.note-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25px;
  width: 8px;
  height: 1px;
  background-color: var(--color-ink);
}

.note-text {
  margin-top: 12px;
  max-width: 66ch;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.feedback-path {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.faq-list {
  margin-top: 26px;
  border-top: 1px solid var(--color-line);
}

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

.faq-question {
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 12px 34px 12px 0;
  position: relative;
  cursor: pointer;
  color: var(--color-ink);
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  list-style: none;
}

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

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

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

.faq-question:hover {
  color: #000000;
}

.faq-answer {
  padding: 0 0 20px;
  max-width: 66ch;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.85;
}

.feedback-note {
  margin-top: 24px;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.feedback-note a {
  color: var(--color-ink);
  font-weight: 600;
  border-bottom: 1px solid var(--color-line-strong);
}

.feedback-note a:hover {
  border-bottom-color: var(--color-ink);
}

.return-path .return-heading {
  width: 100%;
  font-size: 17px;
  color: var(--color-ink);
}

.return-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.return-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-ink);
  font-size: 15px;
  border-bottom: 1px solid var(--color-line-strong);
}

.return-list a:hover {
  border-bottom-color: var(--color-ink);
}

/* ===== pages: about ===== */

.inner-layout {
  padding-top: 40px;
}

.about-positioning {
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.principle-grid {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.principle-item {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-page);
}

.principle-title {
  font-size: 16px;
  color: var(--color-ink);
}

.principle-item p {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.78;
}

.about-maintenance {
  padding: 40px 0;
  border-bottom: 1px solid var(--color-line);
}

.maintenance-list {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.maintenance-item {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.maintenance-title {
  font-size: 16px;
  color: var(--color-ink);
}

.maintenance-item p {
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.78;
}

.about-boundary {
  padding: 40px 0 8px;
}

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

.boundary-list li {
  padding: 14px 0 14px 20px;
  border-bottom: 1px solid var(--color-line);
  position: relative;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 25px;
  width: 8px;
  height: 1px;
  background-color: var(--color-ink);
}

.feedback-block {
  margin-top: 30px;
}

.feedback-block p {
  margin-top: 10px;
  max-width: 66ch;
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.85;
}

.related-links {
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--color-line);
}

.related-list {
  margin-top: 6px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 4px 24px;
}

.related-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-ink);
  font-size: 15px;
  border-bottom: 1px solid var(--color-line);
}

.related-list a:hover {
  border-bottom-color: var(--color-ink);
}

/* ===== pages: error ===== */

.error-main {
  max-width: var(--width-read);
  margin: 0 auto;
  padding: 0 var(--gutter) 72px;
}

.error-panel {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--color-line);
}

.error-code {
  font-family: var(--font-head);
  font-size: 13px;
  color: var(--color-soft);
  border-left: 2px solid var(--color-ink);
  padding-left: 10px;
}

.error-title {
  margin-top: 16px;
  font-size: 30px;
  color: var(--color-ink);
}

.error-desc {
  margin-top: 16px;
  max-width: 56ch;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.85;
}

.error-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.error-hints {
  padding: 40px 0 8px;
}

.error-list {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-line);
}

.error-list li {
  border-bottom: 1px solid var(--color-line);
}

.error-list a {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  color: var(--color-ink);
  font-size: 15px;
}

.error-list a:hover {
  color: #000000;
}

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

@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding: 40px var(--gutter) 40px;
  }

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

  .hero-media img {
    height: clamp(210px, 46vw, 300px);
  }

  .scene-overview,
  .inclusion-summary,
  .browse-path,
  .update-record {
    padding: 40px var(--gutter) 36px;
  }

  .record-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

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

  .field-table tbody th {
    width: 40%;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 28px 32px;
  }

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

@media (max-width: 600px) {
  .header-inner {
    min-height: 60px;
    padding: 0 16px;
    align-items: center;
  }

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

  .site-nav {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    padding: 0 16px;
    background-color: var(--color-page);
    border-bottom: 1px solid var(--color-line);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 12px;
  }

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

  .nav-list li {
    display: block;
  }

  .nav-link {
    width: 100%;
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 1px solid var(--color-line);
    border-radius: 0;
  }

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

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

  .breadcrumb {
    padding-top: 18px;
  }

  .page-header {
    padding: 14px 0 24px;
  }

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

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

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

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

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

  .scene-overview,
  .inclusion-summary,
  .browse-path,
  .update-record {
    padding: 32px 16px 30px;
  }

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

  .scene-item {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .scene-link {
    justify-content: center;
  }

  .path-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .section-media img,
  .scene-figure img,
  .entry-figure img,
  .guide-figure img,
  .about-figure img {
    height: clamp(180px, 52vw, 240px);
  }

  .field-table {
    font-size: 14px;
  }

  .field-table th,
  .field-table td {
    padding: 12px 12px;
  }

  .field-table tbody th {
    width: 44%;
  }

  .tips-list,
  .principle-grid,
  .maintenance-list,
  .scene-group-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .footer-boundary {
    padding: 0 16px 16px;
  }

  .footer-bottom {
    padding: 0 16px 28px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}