:root {
  --color-primary: #2f4b7c;
  --color-primary-soft: #6a7fb5;
  --color-accent: #c4553b;
  --color-bg: #f7f8fb;
  --color-surface: #ffffff;
  --color-text: #2b2f36;
  --color-muted: #5a6270;
  --color-border: #dfe3ec;
  --container: 1120px;
  --container-narrow: 760px;
  --radius: 6px;
  --shadow-sm: 0 1px 2px rgba(47, 75, 124, 0.06);
  --shadow-md: 0 4px 14px rgba(47, 75, 124, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

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

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

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

body.site-body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

figure {
  margin: 0;
}

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

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

a:hover,
a:focus-visible {
  color: var(--color-accent);
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 12px;
  letter-spacing: 0;
}

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

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin: 0 0 14px;
}

ul,
ol {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
}

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

button {
  font-family: inherit;
}

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

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

.site-main {
  display: block;
  width: 100%;
}

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

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  margin-bottom: 48px;
}

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

.section__title,
.section-title {
  font-size: 22px;
  margin-bottom: 10px;
}

.section__intro,
.section-intro {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 20px;
  max-width: 760px;
}

.page-layout {
  display: block;
}

.page-layout--single > .section {
  margin-bottom: 48px;
}

/* ==========================================================================
   fact-bar
   ========================================================================== */

.fact-bar {
  background: var(--color-primary);
  color: #eef1f8;
}

.fact-bar__text {
  max-width: var(--container);
  margin: 0 auto;
  padding: 10px 24px;
  font-size: 13px;
  line-height: 1.6;
  color: #eef1f8;
}

.fact-bar__text a {
  color: #ffffff;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   site-header & nav
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.site-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
  text-decoration: none;
}

.site-brand:hover {
  text-decoration: none;
}

.site-brand__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.site-brand__slogan {
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.4;
}

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

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s 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);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
}

.nav-list__item {
  margin: 0;
}

.nav-list__link {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background 0.18s ease, color 0.18s ease;
}

.nav-list__link:hover {
  background: #eef1f8;
  color: var(--color-primary);
  text-decoration: none;
}

.nav-list__link.is-current {
  color: var(--color-primary);
  font-weight: 600;
  background: #eef1f8;
}

/* ==========================================================================
   breadcrumb & page-header
   ========================================================================== */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

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

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

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

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

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

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

.page-description {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 760px;
  margin: 0;
}

.page-description a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ==========================================================================
   buttons & links
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-size: 15px;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
  cursor: pointer;
}

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

.btn--primary:hover {
  background: #24395f;
  color: #ffffff;
  text-decoration: none;
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary-soft);
}

.btn--ghost:hover {
  background: #eef1f8;
  color: var(--color-primary);
  text-decoration: none;
}

.text-link {
  display: inline-block;
  font-size: 14px;
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--color-primary-soft);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

.inline-link {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-primary-soft);
}

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

.table-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.table-link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ==========================================================================
   hero (index)
   ========================================================================== */

.hero {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 32px;
  margin: 24px 0 40px;
  box-shadow: var(--shadow-sm);
}

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.hero__copy {
  min-width: 0;
}

.hero__eyebrow {
  display: inline-block;
  font-size: 13px;
  color: var(--color-accent);
  background: #fdf1ee;
  padding: 4px 10px;
  border-radius: var(--radius);
  margin: 0 0 14px;
  letter-spacing: 0.3px;
}

.hero__title {
  font-size: 32px;
  line-height: 1.3;
  margin: 0 0 14px;
  color: var(--color-primary);
}

.hero__lead {
  font-size: 15px;
  color: var(--color-muted);
  margin: 0 0 18px;
}

.hero__points {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0 0 22px;
}

.hero__point {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  color: var(--color-text);
}

.hero__point::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary-soft);
}

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

.hero__media {
  min-width: 0;
}

.hero__figure {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: #eef1f8;
}

.hero__figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.hero__caption {
  padding: 10px 14px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: 13px;
}

.hero__quick {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px dashed var(--color-border);
}

.hero__quick-title {
  font-size: 18px;
  margin: 0 0 14px;
  color: var(--color-primary);
}

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

.quick-list__item {
  margin: 0;
}

.quick-list__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 14px;
  background: #f7f8fb;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.18s ease, background 0.18s ease;
  min-height: 44px;
}

.quick-list__link:hover {
  background: #eef1f8;
  border-color: var(--color-primary-soft);
  text-decoration: none;
}

.quick-list__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
}

.quick-list__desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* ==========================================================================
   section-head / section-foot
   ========================================================================== */

.section-head {
  margin-bottom: 20px;
}

.section-head__title {
  font-size: 22px;
  margin: 0 0 6px;
  color: var(--color-primary);
}

.section-head__desc {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
  max-width: 760px;
}

.section-foot {
  margin: 16px 0 0;
}

/* ==========================================================================
   data-table
   ========================================================================== */

.table-wrap {
  overflow-x: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.data-table {
  width: 100%;
  min-width: 640px;
  font-size: 14px;
}

.data-table__caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background: #f7f8fb;
  border-bottom: 1px solid var(--color-border);
}

.data-table__head th {
  position: sticky;
  top: 0;
  background: #eef1f8;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 13px;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.data-table__head th.is-sortable {
  cursor: pointer;
  user-select: none;
}

.data-table__head th.is-sortable::after {
  content: " ⇅";
  color: var(--color-primary-soft);
  font-weight: 400;
}

.data-table__row {
  border-bottom: 1px solid var(--color-border);
}

.data-table__row:last-child {
  border-bottom: none;
}

.data-table__row:hover {
  background: #f7f8fb;
}

.data-table__cell {
  padding: 14px 16px;
  color: var(--color-text);
  vertical-align: top;
  line-height: 1.7;
}

.data-table__cell--num {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  width: 84px;
}

.data-table--compact {
  min-width: 0;
}

.data-table--compact .data-table__cell {
  padding: 10px 14px;
  font-size: 14px;
}

/* ==========================================================================
   topic grid / cards
   ========================================================================== */

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

.topic-card {
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

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

.topic-card__media {
  width: 100%;
  background: #eef1f8;
  overflow: hidden;
}

.topic-card__media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.topic-card:hover .topic-card__media img {
  transform: scale(1.03);
}

.topic-card__body {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.topic-card__title,
.topic-card__name {
  font-size: 17px;
  margin: 0;
  color: var(--color-primary);
}

.topic-card__link {
  color: var(--color-primary);
  text-decoration: none;
}

.topic-card__link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.topic-card__desc {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.7;
}

.topic-card__meta {
  font-size: 13px;
  color: var(--color-primary-soft);
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--color-border);
}

/* ==========================================================================
   step list (index & guide)
   ========================================================================== */

.step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  counter-reset: step;
}

.step-item {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  min-width: 0;
}

.step-item__num,
.step-item__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: #ffffff;
  background: var(--color-primary);
  padding: 2px 10px;
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.step-item__title,
.step-item__name {
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--color-primary);
}

.step-item__desc,
.step-item__text {
  font-size: 14px;
  color: var(--color-text);
  margin: 0 0 8px;
  line-height: 1.7;
}

.step-item__check {
  font-size: 13px;
  color: var(--color-accent);
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed var(--color-border);
}

/* ==========================================================================
   scope summary (index) & scope list (guide)
   ========================================================================== */

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

.scope-summary__col {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  min-width: 0;
}

.scope-summary__subtitle {
  font-size: 16px;
  margin: 0 0 12px;
  color: var(--color-primary);
}

.notice-box {
  background: #fdf1ee;
  border: 1px solid #f0d6cf;
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 16px 0 0;
}

.notice-box__text {
  font-size: 14px;
  color: #7a3a2a;
  margin: 0;
  line-height: 1.7;
}

.scope-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: scope;
}

.scope-list__item {
  position: relative;
  padding: 12px 0 12px 34px;
  border-bottom: 1px dashed var(--color-border);
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.75;
  counter-increment: scope;
}

.scope-list__item::before {
  content: counter(scope);
  position: absolute;
  left: 0;
  top: 14px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #eef1f8;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: center;
}

.scope-list__item:last-child {
  border-bottom: none;
}

.scope-figure {
  margin: 20px 0 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: #eef1f8;
}

.scope-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.scope-figure__caption {
  padding: 10px 14px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: 13px;
}

/* ==========================================================================
   archive glance (index) & archive section (archive)
   ========================================================================== */

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

.archive-group {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  min-width: 0;
}

.archive-group__month,
.archive-group__title {
  font-size: 16px;
  margin: 0 0 12px;
  color: var(--color-primary);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.archive-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.archive-list__item,
.archive-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 14px;
}

.archive-list__item:last-child,
.archive-item:last-child {
  border-bottom: none;
}

.archive-list__date,
.archive-item__date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-primary-soft);
}

.archive-list__channel,
.archive-item__meta {
  font-size: 12px;
  color: var(--color-accent);
}

.archive-list__text,
.archive-item__text {
  margin: 0;
  color: var(--color-text);
  line-height: 1.7;
}

.archive-section {
  margin-bottom: 40px;
}

.archive-item {
  flex-direction: row;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.archive-item__media {
  flex: 0 0 140px;
  width: 140px;
  border-radius: var(--radius);
  overflow: hidden;
  background: #eef1f8;
}

.archive-item__media img {
  width: 100%;
  height: 90px;
  object-fit: cover;
}

.archive-item__body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.archive-item__link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
}

.archive-item__link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

.archive-tags,
.archive-rule {
  margin-bottom: 40px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
}

.tag-list__item {
  margin: 0;
}

.tag-list__link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-primary);
  text-decoration: none;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.tag-list__link:hover {
  background: #eef1f8;
  border-color: var(--color-primary-soft);
  color: var(--color-primary);
  text-decoration: none;
}

.rule-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.rule-list__item {
  position: relative;
  padding: 10px 0 10px 22px;
  border-bottom: 1px dashed var(--color-border);
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.75;
}

.rule-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary-soft);
}

.rule-list__item:last-child {
  border-bottom: none;
}

.rule-list__link {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-primary-soft);
}

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

/* ==========================================================================
   site index / column index / related links
   ========================================================================== */

.site-index {
  margin-bottom: 40px;
}

.index-list,
.site-index__list,
.column-index__list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.index-list__item,
.site-index__item,
.column-index__item {
  margin: 0;
}

.index-list__link,
.site-index__link,
.column-index__link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  min-height: 44px;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.index-list__link:hover,
.site-index__link:hover,
.column-index__link:hover {
  background: #eef1f8;
  border-color: var(--color-primary-soft);
  text-decoration: none;
}

.index-list__name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
}

.index-list__desc,
.site-index__desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.related-links__item {
  margin: 0;
}

.related-links__link {
  display: block;
  padding: 12px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-primary);
  text-decoration: none;
  min-height: 44px;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.related-links__link:hover {
  background: #eef1f8;
  border-color: var(--color-primary-soft);
  text-decoration: none;
}

/* ==========================================================================
   pages: channels
   ========================================================================== */

.channel-table {
  min-width: 720px;
}

.channel-table__id {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.table-sort {
  background: transparent;
  border: none;
  padding: 0;
  font: inherit;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
}

.table-sort:hover {
  color: var(--color-accent);
}

.channel-block {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

.channel-block:last-child {
  border-bottom: none;
}

.channel-block__media {
  border-radius: 8px;
  overflow: hidden;
  background: #eef1f8;
  border: 1px solid var(--color-border);
}

.channel-block__media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.channel-block__body {
  min-width: 0;
}

.channel-block__title {
  font-size: 18px;
  margin: 0 0 10px;
  color: var(--color-primary);
}

.channel-block__text {
  font-size: 15px;
  color: var(--color-text);
  margin: 0 0 12px;
  line-height: 1.8;
}

.channel-block__list {
  margin: 0 0 12px;
  padding: 0;
  list-style: none;
}

.channel-block__item {
  position: relative;
  padding: 6px 0 6px 20px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.channel-block__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary-soft);
}

.channel-block__meta {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
  padding-top: 10px;
  border-top: 1px dashed var(--color-border);
}

.channel-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.channel-map__item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  min-width: 0;
}

.channel-map__code {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--color-primary);
  background: #eef1f8;
  padding: 2px 8px;
  border-radius: var(--radius);
  font-size: 13px;
}

.channel-map__name {
  font-weight: 600;
  color: var(--color-text);
}

.channel-map__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   pages: topics
   ========================================================================== */

.topics-entry {
  margin-bottom: 48px;
}

.topics-plan {
  margin-bottom: 48px;
}

.plan-block {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
}

.plan-block:last-child {
  border-bottom: none;
}

.plan-block__name {
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--color-primary);
}

.plan-block__text {
  font-size: 15px;
  color: var(--color-text);
  margin: 0 0 8px;
  line-height: 1.8;
}

.topics-mapping {
  margin-bottom: 48px;
}

.mapping-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.mapping-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 18px;
  min-width: 0;
}

.mapping-item__name {
  font-size: 15px;
  margin: 0 0 6px;
  color: var(--color-primary);
}

.mapping-item__text {
  font-size: 14px;
  color: var(--color-muted);
  margin: 0;
  line-height: 1.7;
}

.mapping-item__text a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-primary-soft);
}

.mapping-item__text a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.section__note {
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--color-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

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

.section--fields,
.section--scope,
.section--faq,
.section--related,
.section--index {
  margin-bottom: 48px;
}

.field-table-wrap {
  overflow-x: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.field-table {
  width: 100%;
  min-width: 520px;
  font-size: 14px;
}

.field-table__caption {
  caption-side: top;
  text-align: left;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background: #f7f8fb;
  border-bottom: 1px solid var(--color-border);
}

.field-table thead th {
  position: sticky;
  top: 0;
  background: #eef1f8;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 13px;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

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

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

.field-table tbody td:first-child {
  font-weight: 600;
  color: var(--color-primary);
  width: 140px;
  white-space: nowrap;
}

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

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0;
  overflow: hidden;
}

.faq-item[open] {
  border-color: var(--color-primary-soft);
}

.faq-item__question {
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
}

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

.faq-item__question::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-primary-soft);
  font-weight: 400;
  transition: transform 0.2s ease;
}

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

.faq-item__question:hover {
  color: var(--color-accent);
}

.faq-item__answer {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.8;
  border-top: 1px dashed var(--color-border);
  padding-top: 14px;
}

/* ==========================================================================
   pages: 404
   ========================================================================== */

.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 60px 24px 80px;
}

.error-hero {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.error-hero__code {
  font-family: var(--font-mono);
  font-size: 64px;
  font-weight: 700;
  color: var(--color-primary-soft);
  margin: 0 0 8px;
  line-height: 1;
}

.error-hero__title {
  font-size: 28px;
  margin: 0 0 12px;
  color: var(--color-primary);
}

.error-hero__text {
  font-size: 15px;
  color: var(--color-muted);
  margin: 0 0 22px;
}

.error-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin: 0;
}

.error-links {
  max-width: 640px;
  margin: 0 auto;
}

.error-links__title {
  font-size: 18px;
  margin: 0 0 14px;
  color: var(--color-primary);
  text-align: center;
}

.error-links__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.error-links__item {
  margin: 0;
}

.error-links__link {
  display: block;
  padding: 12px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-primary);
  text-decoration: none;
  min-height: 44px;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.error-links__link:hover {
  background: #eef1f8;
  border-color: var(--color-primary-soft);
  text-decoration: none;
}

/* ==========================================================================
   site-footer
   ========================================================================== */

.site-footer {
  background: #1f2a44;
  color: #c8d0e2;
  margin-top: 40px;
}

.site-footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr repeat(4, minmax(0, 1fr));
  gap: 32px;
}

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

.footer-col__title {
  font-size: 15px;
  color: #ffffff;
  margin: 0 0 12px;
  font-weight: 600;
}

.footer-col__text {
  font-size: 13px;
  line-height: 1.8;
  color: #a4aec7;
  margin: 0;
}

.footer-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-list__item {
  margin: 0;
}

.footer-list__link {
  display: inline-block;
  font-size: 13px;
  color: #c8d0e2;
  text-decoration: none;
  transition: color 0.18s ease;
  padding: 2px 0;
}

.footer-list__link:hover {
  color: #ffffff;
  text-decoration: underline;
}

.site-footer__bottom {
  border-top: 1px solid rgba(200, 208, 226, 0.15);
}

.copyright {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px;
  font-size: 12px;
  color: #8a94ac;
  line-height: 1.7;
}

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

@media (max-width: 1024px) {
  .hero__inner {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

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

  .index-list,
  .site-index__list,
  .column-index__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (max-width: 768px) {
  .site-header__inner {
    padding: 10px 16px;
    gap: 12px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .nav-list.is-open {
    max-height: 400px;
    padding: 8px 0;
    border-top: 1px solid var(--color-border);
    margin-top: 8px;
  }

  .nav-list__link {
    padding: 12px 14px;
    font-size: 16px;
  }

  .inner-main,
  .home-main,
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-title,
  .hero__title,
  h1 {
    font-size: 26px;
  }

  .hero {
    padding: 22px 18px;
  }

  .hero__figure img {
    height: 200px;
  }

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

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

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

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

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

  .index-list,
  .site-index__list,
  .column-index__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .related-links,
  .mapping-list,
  .channel-map,
  .error-links__list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .channel-block__media img {
    height: 200px;
  }

  .archive-item {
    flex-direction: column;
  }

  .archive-item__media {
    flex: none;
    width: 100%;
  }

  .archive-item__media img {
    height: 160px;
  }

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

  .copyright {
    padding: 14px 16px;
  }

  .error-hero__code {
    font-size: 48px;
  }

  .error-hero__title {
    font-size: 22px;
  }
}

@media (max-width: 420px) {
  .index-list,
  .site-index__list,
  .column-index__list {
    grid-template-columns: minmax(0, 1fr);
  }

  .fact-bar__text {
    padding: 10px 16px;
    font-size: 12px;
  }
}

/* ==========================================================================
   motion enhancement
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .topic-card,
  .channel-block,
  .step-item,
  .faq-item,
  .archive-group,
  .mapping-item {
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  }
}