:root {
  --bg-page: #f3f5f7;
  --bg-card: #ffffff;
  --bg-soft: #eaf2f9;
  --ink-title: #1f4e79;
  --ink-link: #2f6fb3;
  --ink-body: #202936;
  --ink-muted: #66717e;
  --line: #d8dee6;
  --accent-time: #b7791f;
  --radius: 6px;
  --shell: 1120px;
  --reading: 760px;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-title: "Songti SC", "SimSun", "STSong", "Noto Serif SC", serif;
}

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

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

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

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

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

a:hover,
a:focus-visible {
  color: var(--ink-title);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

h1,
h2,
h3,
h4 {
  color: var(--ink-title);
  font-family: var(--font-title);
  font-weight: 600;
  margin: 0;
  line-height: 1.45;
}

p {
  margin: 0 0 14px;
}

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

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

dl,
dd,
dt {
  margin: 0;
}

figure {
  margin: 0;
}

figcaption {
  color: var(--ink-muted);
  font-size: 13.5px;
  line-height: 1.7;
  margin-top: 8px;
}

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

.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  padding: 8px 14px;
  background: var(--ink-title);
  color: #ffffff;
  border-radius: 0 0 var(--radius) 0;
  transform: translateY(-120%);
  transition: transform 0.18s ease;
  z-index: 60;
}

.skip-link:focus {
  transform: translateY(0);
  color: #ffffff;
  text-decoration: none;
}

/* --------------------------------- layout -------------------------------- */

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

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main,
.home-main,
.shell,
.page-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 56px;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: start;
}

.layout-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 56px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 40px;
  align-items: start;
}

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

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

.page-aside {
  min-width: 0;
  font-size: 14.5px;
  line-height: 1.75;
}

/* -------------------------------- header --------------------------------- */

.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--ink-title);
  flex-shrink: 0;
  line-height: 1.25;
}

.brand:hover,
.brand:focus-visible {
  text-decoration: none;
  color: var(--ink-link);
}

.brand-mark {
  font-family: var(--font-title);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink-title);
}

.brand-tagline {
  font-size: 12px;
  color: var(--ink-muted);
  letter-spacing: 0;
}

.site-nav {
  margin-left: auto;
  min-width: 0;
}

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

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 11px;
  color: var(--ink-body);
  font-size: 15px;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink-link);
  border-bottom-color: var(--ink-link);
  text-decoration: none;
}

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

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

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink-title);
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ------------------------------- breadcrumb ------------------------------ */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 14px;
  color: var(--ink-muted);
  padding: 20px 0 0;
  line-height: 1.6;
}

.breadcrumb ol {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

.breadcrumb-sep {
  color: #a8b2be;
}

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

/* ------------------------------- page header ----------------------------- */

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

.page-title {
  font-size: 32px;
  line-height: 1.35;
  margin: 0;
}

.page-title .page-lead,
.page-title .page-subtitle {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-body);
  margin: 12px 0 0;
  max-width: 840px;
}

.page-lead {
  margin: 12px 0 0;
  color: var(--ink-body);
  max-width: 840px;
}

.page-subtitle {
  margin: 12px 0 0;
  color: var(--ink-body);
  max-width: 840px;
}

.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink-muted);
}

.page-meta > div {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

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

.page-meta dd {
  color: var(--ink-body);
}

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

.page-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink-muted);
}

.page-fields li {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.field-label {
  color: var(--ink-muted);
}

.field-value {
  color: var(--ink-body);
}

.field-row {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 6px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

.field-row:last-child {
  border-bottom: 0;
}

.field-row dt {
  flex: 0 0 84px;
  color: var(--ink-muted);
}

.field-row dd {
  color: var(--ink-body);
  min-width: 0;
}

/* -------------------------------- sections ------------------------------- */

section {
  margin-top: 40px;
}

section h2 {
  font-size: 22px;
  line-height: 1.45;
  margin: 0 0 8px;
}

section h3 {
  font-size: 18px;
  line-height: 1.55;
  margin: 0 0 6px;
}

.section-lead,
.section-intro {
  color: var(--ink-muted);
  font-size: 15px;
  line-height: 1.8;
  margin: 0 0 18px;
  max-width: 820px;
}

/* --------------------------------- home hero ----------------------------- */

.archive-hero {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 40px;
  align-items: start;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 32px 34px;
}

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

.hero-eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 10px;
  background: var(--bg-soft);
  border-left: 3px solid var(--ink-link);
  color: var(--ink-title);
  font-size: 13px;
  line-height: 1.6;
}

.archive-hero h1 {
  font-size: 36px;
  line-height: 1.3;
  margin: 0 0 14px;
}

.hero-lead {
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 8px;
  color: var(--ink-body);
}

.hero-sub {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-muted);
  margin: 0 0 20px;
}

.hero-entries {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.hero-entry {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: var(--bg-soft);
  border: 1px solid #cfe0ef;
  border-radius: var(--radius);
  min-height: 44px;
  color: var(--ink-body);
}

.hero-entry:hover,
.hero-entry:focus-visible {
  background: #dfeaf5;
  border-color: var(--ink-link);
  text-decoration: none;
}

.entry-label {
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-title);
}

.entry-desc {
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-muted);
}

.archive-hero-visual {
  min-width: 0;
}

.archive-hero-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

/* ------------------------------- channel index --------------------------- */

.index-list {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.index-entry a {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) 24px;
  align-items: center;
  gap: 18px;
  padding: 14px 20px;
  color: var(--ink-body);
  min-height: 44px;
}

.index-entry a:hover,
.index-entry a:focus-visible {
  background: #f7fafd;
  text-decoration: none;
}

.index-name {
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-title);
}

.index-desc {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-muted);
  min-width: 0;
}

.index-arrow {
  color: var(--ink-link);
  font-size: 15px;
  text-align: right;
}

/* ------------------------------ archive overview ------------------------- */

.archive-overview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.stage-rail {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  min-width: 0;
}

.stage-rail h3 {
  margin-bottom: 12px;
}

.stage-list {
  position: relative;
  border-left: 2px solid #cfdce8;
  padding-left: 18px;
}

.stage-item {
  position: relative;
  padding: 10px 0 14px;
}

.stage-item + .stage-item {
  border-top: 1px dashed var(--line);
}

.stage-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 20px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-link);
}

.stage-name {
  display: block;
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-title);
  margin-bottom: 2px;
}

.stage-range {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-muted);
  margin: 0 0 6px;
}

.stage-item a {
  font-size: 14px;
}

.stage-note {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  min-width: 0;
}

.stage-note h3 {
  margin-bottom: 10px;
}

.stage-note > p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-body);
}

.stage-note-list {
  margin: 12px 0 0;
  display: grid;
  gap: 8px;
}

.stage-note-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-body);
}

.stage-note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-time);
}

.stage-note-link {
  margin-top: 14px;
  font-size: 14.5px;
}

/* ------------------------------ field explainer -------------------------- */

.field-explainer-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 32px;
  align-items: start;
}

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

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

.field-list {
  min-width: 0;
}

.field-definitions {
  margin-top: 10px;
  border-top: 1px solid var(--line);
}

.field-definitions .field-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
}

.field-definitions .field-row dt {
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-title);
}

.field-definitions .field-row dd {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-body);
}

.field-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
}

/* ------------------------------ catalog sample --------------------------- */

.catalog-table {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.catalog-row {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) 92px 96px 104px 84px;
  align-items: center;
  gap: 12px;
  padding: 11px 18px;
  font-size: 14.5px;
  line-height: 1.65;
  border-top: 1px solid var(--line);
}

.catalog-row:first-child {
  border-top: 0;
}

.catalog-row > span {
  min-width: 0;
  overflow-wrap: anywhere;
}

.catalog-head {
  background: #f5f8fb;
  color: var(--ink-muted);
  font-size: 13.5px;
  font-weight: 600;
}

.catalog-row:not(.catalog-head):hover {
  background: #f7fafd;
}

.catalog-sample-more {
  margin-top: 14px;
  font-size: 14.5px;
}

/* ------------------------------- theme entry ----------------------------- */

.theme-columns {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.theme-column {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  min-width: 0;
}

.theme-column h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.theme-column p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
  margin-bottom: 10px;
}

.theme-column a {
  display: block;
  font-size: 14px;
  padding: 4px 0;
  min-height: 28px;
}

.theme-column a + a {
  border-top: 1px dashed var(--line);
}

/* ------------------------------ reading path ----------------------------- */

.path-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.path-step {
  display: flex;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.path-num {
  flex: 0 0 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-soft);
  color: var(--ink-title);
  border-radius: 50%;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 600;
}

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

.path-body h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.path-body p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
  margin-bottom: 8px;
}

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

/* --------------------------------- faq ----------------------------------- */

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 44px 14px 18px;
  position: relative;
  font-family: var(--font-title);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-title);
  line-height: 1.6;
  min-height: 44px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--ink-link);
  line-height: 1;
}

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

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

.faq-item > p,
.faq-answer {
  padding: 0 18px 16px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-body);
}

.faq-answer p {
  margin: 0 0 10px;
}

.faq-related {
  font-size: 14px;
  color: var(--ink-muted);
}

.faq-related a + a {
  margin-left: 12px;
}

.faq-preview-more {
  margin-top: 6px;
  font-size: 14.5px;
}

/* ------------------------------ boundary note ---------------------------- */

.boundary-note {
  background: var(--bg-soft);
  border: 1px solid #cfe0ef;
  border-left: 3px solid var(--ink-link);
  border-radius: var(--radius);
  padding: 18px 22px;
}

.boundary-note h2 {
  font-size: 18px;
  margin-bottom: 6px;
}

.boundary-note p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-body);
  margin: 0;
}

/* --------------------------------- footer -------------------------------- */

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

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 34px 24px 26px;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr));
  gap: 28px 32px;
  align-items: start;
}

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

.footer-brand-name {
  font-family: var(--font-title);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-title);
  margin: 0 0 4px;
}

.footer-brand-line {
  font-size: 14px;
  color: var(--ink-muted);
  margin: 0 0 12px;
}

.copy-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink-title);
  font-size: 14px;
  line-height: 1.4;
}

.copy-link:hover,
.copy-link:focus-visible {
  border-color: var(--ink-link);
  color: var(--ink-link);
}

.copy-status {
  display: inline-block;
  margin-left: 10px;
  font-size: 13px;
  color: var(--ink-muted);
  vertical-align: middle;
}

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

.footer-col h2 {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-title);
  margin: 0 0 10px;
  line-height: 1.5;
}

.footer-col ul {
  display: grid;
  gap: 2px;
}

.footer-col a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: 14px;
  color: var(--ink-body);
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--ink-link);
}

.footer-bottom {
  border-top: 1px solid var(--line);
}

.footer-bottom p {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 14px 24px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-muted);
}

/* ------------------------------- aside blocks ---------------------------- */

.aside-block {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 18px;
}

.aside-block h2 {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-title);
  margin: 0 0 8px;
  line-height: 1.5;
}

.aside-block ul {
  display: grid;
  gap: 2px;
}

.aside-block a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: 14px;
  color: var(--ink-body);
}

.aside-block a:hover,
.aside-block a:focus-visible {
  color: var(--ink-link);
}

.aside-note p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-muted);
  margin: 0;
}

.aside-toc {
  counter-reset: toc;
}

/* --------------------------- serial archive page ------------------------- */

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

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

.stage-cell h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.stage-cell p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
  margin-bottom: 12px;
}

.stage-cell a {
  margin-top: auto;
  font-size: 14px;
}

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

.timeline-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.timeline-list {
  position: relative;
  border-left: 2px solid #cfdce8;
  padding-left: 22px;
  display: grid;
  gap: 14px;
}

.timeline-item {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 18px;
  min-width: 0;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-link);
}

.timeline-stage {
  display: inline-block;
  margin-bottom: 4px;
  padding: 1px 8px;
  background: var(--bg-soft);
  border-radius: 3px;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-title);
}

.timeline-desc {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-body);
  margin: 4px 0 8px;
}

.timeline-item a {
  font-size: 14px;
}

.field-table,
.quality-table,
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14.5px;
  line-height: 1.65;
}

.field-table caption,
.quality-table caption,
.data-table caption {
  text-align: left;
  font-size: 13.5px;
  color: var(--ink-muted);
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: #f8fafc;
}

.field-table th,
.field-table td,
.quality-table th,
.quality-table td,
.data-table th,
.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}

.field-table thead th,
.quality-table thead th,
.data-table thead th {
  background: #f5f8fb;
  color: var(--ink-title);
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
}

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

.quality-table tbody th {
  background: #fbfcfd;
  color: var(--ink-title);
  font-weight: 600;
  white-space: nowrap;
}

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

.compare-time,
.compare-chapter {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.compare-time h3,
.compare-chapter h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.compare-time p,
.compare-chapter p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-body);
  margin-bottom: 10px;
}

.compare-time ul,
.compare-chapter ul {
  display: grid;
  gap: 6px;
}

.compare-time li,
.compare-chapter li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
}

.compare-time li::before,
.compare-chapter li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-link);
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 32px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.related-links-label {
  color: var(--ink-muted);
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink-link);
}

.related-links-item:hover,
.related-links-item:focus-visible {
  border-color: var(--ink-link);
  text-decoration: none;
}

/* ------------------------------ catalog page ----------------------------- */

.catalog-scene figure {
  margin-bottom: 14px;
}

.catalog-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.catalog-scene > p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-body);
}

.table-scroll {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius);
}

.catalog-table-section .catalog-table {
  min-width: 640px;
}

.catalog-table-section .catalog-table th,
.catalog-table-section .catalog-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 14.5px;
  line-height: 1.65;
}

.catalog-table-section .catalog-table thead th {
  background: #f5f8fb;
  color: var(--ink-title);
  font-weight: 600;
  font-size: 14px;
  white-space: nowrap;
}

.catalog-table-section .catalog-table tbody tr:last-child td {
  border-bottom: 0;
}

.catalog-fields .field-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  margin-top: 14px;
}

.catalog-fields .field-item {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--ink-link);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 0;
}

.catalog-fields .field-item dt {
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-title);
  margin-bottom: 4px;
}

.catalog-fields .field-item dd {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-body);
}

.relation-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 14px;
}

.relation-item {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.relation-item h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.relation-item p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
  margin-bottom: 10px;
}

.relation-item a {
  margin-top: auto;
  font-size: 14px;
}

/* ------------------------------- themes page ----------------------------- */

.theme-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 28px;
  align-items: start;
  margin-top: 26px;
}

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

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

.theme-intro-text {
  min-width: 0;
}

.theme-intro-text h2 {
  margin-bottom: 10px;
}

.theme-intro-text p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-body);
  margin-bottom: 12px;
}

.theme-intro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  font-size: 14.5px;
}

.theme-categories .theme-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

.theme-col-left,
.theme-col-right {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.theme-group {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  min-width: 0;
}

.theme-group h3 {
  font-size: 17px;
  margin-bottom: 4px;
}

.theme-group p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
  margin-bottom: 8px;
}

.theme-group-links {
  display: grid;
  gap: 2px;
}

.theme-group-links li a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: 14px;
}

.context-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.context-tags a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--ink-link);
}

.context-tags a:hover,
.context-tags a:focus-visible {
  border-color: var(--ink-link);
  background: #f7fafd;
  text-decoration: none;
}

.theme-note p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-body);
  margin-bottom: 10px;
}

.theme-note-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  font-size: 14.5px;
}

/* ---------------------------- reading guide page ------------------------- */

.guide-figure {
  margin-top: 26px;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

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

.guide-paths h2,
.guide-paths .section-intro {
  grid-column: 1 / -1;
}

.guide-path {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.guide-path .path-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-bottom: 8px;
  background: var(--bg-soft);
  color: var(--ink-title);
  border-radius: 50%;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 600;
}

.guide-path h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.guide-path > p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-body);
  margin-bottom: 8px;
}

.guide-path .path-landing {
  font-size: 14px;
  color: var(--ink-muted);
  margin: 0;
}

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

.guide-pairing h2,
.guide-pairing .section-intro {
  grid-column: 1 / -1;
}

.guide-time,
.guide-catalog {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.guide-time h3,
.guide-catalog h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.guide-time p,
.guide-catalog p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-body);
  margin-bottom: 10px;
}

.guide-time ul,
.guide-catalog ul {
  display: grid;
  gap: 6px;
}

.guide-time li,
.guide-catalog li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
}

.guide-time li::before,
.guide-catalog li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-link);
}

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

.revisit-step {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.revisit-step .step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-bottom: 8px;
  background: var(--bg-soft);
  color: var(--ink-title);
  border-radius: 50%;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 600;
}

.revisit-step h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

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

.correction-list {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.correction-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-body);
}

.correction-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-time);
}

.correction-list strong {
  color: var(--ink-title);
}

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

/* ------------------------------ about site page -------------------------- */

.position-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 14px;
}

.position-text,
.audience-text {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.position-text h3,
.audience-text h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.position-text p,
.audience-text p {
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-body);
  margin-bottom: 10px;
}

.audience-text ul {
  display: grid;
  gap: 6px;
  margin-bottom: 10px;
}

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

.audience-text li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-link);
}

.about-figure {
  margin-top: 24px;
}

.about-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.method-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-top: 14px;
}

.method-step {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  min-width: 0;
}

.method-step .step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-bottom: 8px;
  background: var(--bg-soft);
  color: var(--ink-title);
  border-radius: 50%;
  font-family: var(--font-title);
  font-size: 14px;
  font-weight: 600;
}

.method-step h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.method-step p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
  margin-bottom: 6px;
}

.method-step .step-output {
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px;
  color: var(--ink-title);
}

.about-quality .quality-table {
  margin-top: 14px;
}

.about-boundaries .boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.about-boundaries .boundary-list li {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent-time);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-width: 0;
}

.about-boundaries .boundary-list li:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.about-boundaries .boundary-list h3 {
  font-size: 15.5px;
  margin-bottom: 4px;
}

.about-boundaries .boundary-list p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
  margin: 0;
}

.about-privacy .privacy-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 14px;
}

.about-privacy .privacy-list li {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  min-width: 0;
}

.about-privacy .privacy-list h3 {
  font-size: 15.5px;
  margin-bottom: 4px;
}

.about-privacy .privacy-list p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-muted);
  margin: 0;
}

.about-feedback .feedback-list {
  display: grid;
  gap: 4px;
  margin: 10px 0 14px;
}

.about-feedback .feedback-list a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: 14.5px;
}

.about-feedback .feedback-note {
  font-size: 14px;
  color: var(--ink-muted);
}

.about-links .link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 12px;
}

.about-links .link-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
}

.about-links .link-list a:hover,
.about-links .link-list a:focus-visible {
  border-color: var(--ink-link);
  text-decoration: none;
}

/* --------------------------------- faq page ------------------------------ */

.faq-figure {
  margin-top: 26px;
}

.faq-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.faq-section {
  margin-top: 34px;
}

.faq-more {
  margin-top: 34px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.faq-more h2 {
  font-family: var(--font-body);
  font-size: 15px;
  margin-bottom: 8px;
}

.faq-more ul {
  display: grid;
  gap: 2px;
}

.faq-more a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: 14.5px;
}

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

.error-main {
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.error-inner {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 64px;
}

.error-code {
  font-family: var(--font-title);
  font-size: 15px;
  color: var(--accent-time);
  margin: 0 0 8px;
  letter-spacing: 0;
}

.error-inner h1 {
  font-size: 32px;
  line-height: 1.35;
  margin: 0 0 12px;
}

.error-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-body);
  margin: 0 0 16px;
}

.error-list {
  display: grid;
  gap: 6px;
  margin: 0 0 22px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-body);
}

.error-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-link);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.error-actions a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14.5px;
}

.error-actions a:hover,
.error-actions a:focus-visible {
  border-color: var(--ink-link);
  text-decoration: none;
}

.error-actions .error-home-link {
  background: var(--ink-title);
  border-color: var(--ink-title);
  color: #ffffff;
}

.error-actions .error-home-link:hover,
.error-actions .error-home-link:focus-visible {
  background: #173d5e;
  border-color: #173d5e;
  color: #ffffff;
}

.error-note {
  font-size: 14px;
  color: var(--ink-muted);
}

/* ------------------------------- responsive ------------------------------ */

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

  .site-nav a {
    padding: 0 8px;
    font-size: 14px;
  }

  .archive-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 26px 24px 28px;
  }

  .archive-hero h1 {
    font-size: 32px;
  }

  .archive-overview-grid,
  .field-explainer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

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

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

  .page-layout,
  .layout-shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .page-aside {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    align-items: start;
  }

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

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

  .stage-cell:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }

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

  .relation-item:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }

  .theme-categories .theme-columns {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .about-privacy .privacy-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .about-privacy .privacy-list li:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }

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

@media (max-width: 720px) {
  .header-inner {
    height: 64px;
    padding: 0 16px;
    flex-wrap: wrap;
    align-content: center;
  }

  .brand-mark {
    font-size: 18px;
  }

  .brand-tagline {
    font-size: 11.5px;
  }

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

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

  .site-nav ul {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 10px;
    border-top: 1px solid var(--line);
  }

  .site-nav ul.is-open {
    display: flex;
  }

  .site-nav a {
    display: flex;
    width: 100%;
    min-height: 44px;
    padding: 0 4px;
    font-size: 15px;
    border-bottom: 1px solid var(--line);
  }

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

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

  .site-nav a.is-current::before {
    content: "";
    display: inline-block;
    width: 3px;
    height: 16px;
    margin-right: 8px;
    background: var(--ink-link);
    border-radius: 2px;
  }

  .home-main,
  .inner-main,
  .shell,
  .page-shell,
  .layout-shell {
    padding-left: 16px;
    padding-right: 16px;
    padding-bottom: 40px;
  }

  .breadcrumb {
    padding-top: 14px;
    font-size: 13.5px;
  }

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

  .page-title,
  .error-inner h1 {
    font-size: 30px;
    line-height: 1.35;
  }

  .page-title .page-lead,
  .page-title .page-subtitle,
  .page-lead,
  .page-subtitle {
    font-size: 15px;
  }

  section {
    margin-top: 30px;
  }

  section h2 {
    font-size: 20px;
  }

  .archive-hero {
    margin-top: 18px;
    padding: 22px 18px 24px;
  }

  .archive-hero h1 {
    font-size: 30px;
  }

  .hero-entries {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .hero-entry {
    padding: 12px 14px;
  }

  .index-entry a {
    grid-template-columns: minmax(0, 1fr) 20px;
    grid-template-areas:
      "name arrow"
      "desc arrow";
    gap: 2px 12px;
    padding: 12px 16px;
  }

  .index-name {
    grid-area: name;
    font-size: 16px;
  }

  .index-desc {
    grid-area: desc;
    font-size: 14px;
  }

  .index-arrow {
    grid-area: arrow;
    align-self: center;
  }

  .stage-rail,
  .stage-note {
    padding: 18px 16px;
  }

  .field-definitions .field-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .catalog-row {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 4px 12px;
    padding: 12px 16px;
  }

  .catalog-row > span:nth-child(1) {
    grid-column: 1 / -1;
    font-weight: 600;
    color: var(--ink-title);
  }

  .catalog-head {
    display: none;
  }

  .theme-columns,
  .path-steps,
  .stage-grid,
  .compare-grid,
  .theme-intro,
  .catalog-fields .field-list,
  .relation-list,
  .guide-paths,
  .guide-pairing,
  .revisit-steps,
  .position-grid,
  .method-steps,
  .about-boundaries .boundary-list,
  .about-privacy .privacy-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .about-boundaries .boundary-list li:last-child:nth-child(odd),
  .stage-cell:last-child:nth-child(odd),
  .relation-item:last-child:nth-child(odd),
  .about-privacy .privacy-list li:last-child:nth-child(odd) {
    grid-column: auto;
  }

  .timeline-list {
    padding-left: 16px;
  }

  .timeline-item::before {
    left: -22px;
  }

  .timeline-figure img,
  .catalog-figure img,
  .guide-figure img,
  .about-figure img,
  .faq-figure img {
    aspect-ratio: 16 / 10;
  }

  .page-aside {
    grid-template-columns: minmax(0, 1fr);
  }

  .faq-item summary {
    font-size: 15.5px;
    padding: 13px 40px 13px 16px;
  }

  .faq-item > p,
  .faq-answer {
    padding: 0 16px 14px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
    padding: 26px 16px 20px;
  }

  .footer-bottom p {
    padding: 12px 16px 16px;
  }

  .error-inner {
    padding: 40px 16px 48px;
  }

  .error-actions a {
    flex: 1 1 auto;
    justify-content: center;
  }
}

@media (max-width: 420px) {
  .archive-hero h1,
  .page-title,
  .error-inner h1 {
    font-size: 27px;
  }

  .catalog-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .catalog-row > span:nth-child(1) {
    grid-column: auto;
  }
}

/* 程序验收反馈：移动端防溢出 */
@media (max-width: 768px) {
  .site-main,
  .site-main * {
    min-width: 0;
    max-width: 100%;
  }

  .site-main :is(h1, h2, h3, h4, p, a, span) {
    overflow-wrap: anywhere;
  }
}