:root {
  --ink: #1f2430;
  --ink-soft: #5c6472;
  --line: #e2e5ea;
  --bg: #f6f7f9;
  --card: #ffffff;
  --head: #151a24;
  --head-soft: #232a38;
  --brand: #2f6df6;
  --brand-dark: #1f52c9;
  --accent: #e0533d;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow: 0 1px 2px rgba(21, 26, 36, 0.06), 0 6px 18px rgba(21, 26, 36, 0.05);
  --container: 1180px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

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

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

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

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

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

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

a:hover {
  color: var(--brand-dark);
}

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

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

p {
  margin: 0 0 16px;
}

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

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

figure {
  margin: 0;
}

figcaption {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

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

.site-header {
  background: var(--head);
  color: #eef1f6;
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-brand {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #ffffff;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0;
  padding: 6px 0;
}

.site-brand::before {
  content: "";
  width: 10px;
  height: 20px;
  border-radius: 2px;
  background: var(--accent);
}

.site-brand:hover {
  color: #ffffff;
}

.site-nav {
  flex: 1 1 auto;
  position: relative;
}

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

.nav-list > li {
  flex: 0 0 auto;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  color: #c7cedb;
  font-size: 15px;
}

.nav-list a:hover {
  color: #ffffff;
  background: var(--head-soft);
}

.nav-list a.is-current {
  color: #ffffff;
  background: var(--head-soft);
  box-shadow: inset 0 -2px 0 var(--brand);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  background: var(--head-soft);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: #eef1f6;
}

.header-tools {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  border: 1px solid #384153;
  color: #c7cedb;
  font-size: 14px;
}

.tool-link:hover {
  color: #ffffff;
  border-color: #55617a;
}

.tool-link-strong {
  background: var(--brand);
  border-color: var(--brand);
  color: #ffffff;
}

.tool-link-strong:hover {
  background: var(--brand-dark);
  border-color: var(--brand-dark);
  color: #ffffff;
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.breadcrumb-sep {
  color: #a7aebc;
}

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

.page-header {
  padding: 22px 0 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  margin-bottom: 12px;
}

.page-description {
  max-width: 820px;
  color: var(--ink-soft);
  font-size: 16px;
}

.page-meta {
  margin: 14px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.page-meta span {
  font-family: var(--mono);
}

.section {
  margin-bottom: 48px;
}

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

.section-desc,
.section-intro {
  max-width: 860px;
  color: var(--ink-soft);
  font-size: 15px;
  margin-bottom: 22px;
}

.section-foot,
.section-tail,
.section-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-soft);
}

.section-foot a,
.section-tail a,
.section-note a,
.section-intro a {
  font-weight: 500;
}

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

.back-to-main {
  display: block;
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 24px 0;
  font-size: 14px;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 24px 24px 8px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
  gap: 32px;
}

.footer-brand-name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

.footer-col-title {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--ink);
}

.footer-list li {
  margin-bottom: 8px;
}

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

.footer-list a:hover {
  color: var(--brand);
}

.footer-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 24px 26px;
  font-size: 13px;
  color: #8b93a3;
  border-top: 1px solid var(--line);
}

/* ============ components ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
}

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

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

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

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

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

.topic-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.topic-card:hover {
  border-color: #cfd6e2;
  box-shadow: var(--shadow);
}

.topic-media {
  overflow: hidden;
  background: #e9ecf1;
}

.topic-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  object-fit: cover;
  transition: transform 0.35s ease;
}

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

.topic-body {
  padding: 18px 20px 20px;
}

.topic-name {
  font-size: 18px;
  margin-bottom: 8px;
}

.topic-desc {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.topic-tags,
.topic-channels {
  margin: 0;
  font-size: 13px;
  color: var(--accent);
  font-family: var(--mono);
}

.aside-block {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 20px;
}

.aside-title {
  font-size: 15px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.aside-list li {
  margin-bottom: 8px;
}

.aside-list li:last-child {
  margin-bottom: 0;
}

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

.aside-list a:hover {
  color: var(--brand);
}

/* ============ pages: index ============ */

.site-lead-bar {
  background: var(--head-soft);
  color: #c7cedb;
  font-size: 14px;
  text-align: center;
  padding: 9px 24px;
  margin: 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
  padding: 44px 0 48px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 48px;
}

.hero-kicker {
  display: inline-block;
  margin: 0 0 14px;
  padding: 3px 10px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  color: var(--accent);
  font-size: 13px;
  font-family: var(--mono);
}

.hero-title {
  font-size: 34px;
  margin-bottom: 14px;
}

.hero-desc {
  color: var(--ink-soft);
  font-size: 16px;
  max-width: 560px;
  margin-bottom: 24px;
}

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

.hero-media {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  background: #e9ecf1;
  border: 1px solid var(--line);
}

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

.hero-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  background: #ffffff;
  border-top: 1px solid var(--line);
}

.hero-log {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hero-log-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 14px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.hero-log-item .log-date {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  flex: 0 0 auto;
}

.hero-log-item .log-text {
  color: var(--ink-soft);
}

.section-head {
  margin-bottom: 22px;
}

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

.section-head .section-desc {
  margin-bottom: 0;
}

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

.channel-row {
  display: grid;
  grid-template-columns: 72px 1.1fr 1.6fr 1.4fr;
  gap: 18px;
  align-items: baseline;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  color: var(--ink-soft);
}

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

.channel-row-head {
  background: #eef1f6;
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  padding: 11px 20px;
}

a.channel-row:hover {
  background: #f2f6ff;
}

.channel-row .col-no {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
}

.channel-row .col-name {
  color: var(--ink);
  font-weight: 600;
}

.channel-row .col-field {
  font-size: 14px;
}

.field-boundary-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
}

.field-col,
.boundary-col {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
}

.col-title {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.field-list .field-item {
  display: flex;
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

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

.field-key {
  flex: 0 0 84px;
  font-weight: 600;
  color: var(--ink);
}

.field-val {
  color: var(--ink-soft);
}

.boundary-list .boundary-item {
  position: relative;
  padding: 7px 0 7px 20px;
  font-size: 14px;
  color: var(--ink-soft);
}

.boundary-list .boundary-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 15px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

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

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

.log-month {
  font-size: 16px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
}

.log-list .log-item {
  display: grid;
  grid-template-columns: 68px 1fr;
  gap: 6px 12px;
  align-items: baseline;
  padding: 9px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14px;
}

.log-list .log-item:last-child {
  border-bottom: 0;
}

.log-item .log-date {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
}

.log-item .log-target {
  font-weight: 600;
  color: var(--ink);
}

.log-item .log-text {
  grid-column: 2;
  color: var(--ink-soft);
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}

.index-card {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 20px;
  color: var(--ink);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.index-card:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow);
  color: var(--ink);
}

.index-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.index-desc {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0;
}

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

.section-channels-table .channel-table {
  padding: 0;
}

.section-channels-table .channel-row {
  display: grid;
  grid-template-columns: 72px minmax(140px, 0.9fr) 1.6fr 1.3fr;
  gap: 18px;
  align-items: baseline;
  padding: 16px 22px;
  border-bottom: 1px solid var(--line);
}

.section-channels-table .channel-row:last-child {
  border-bottom: 0;
}

.channel-code {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
}

.channel-name {
  font-size: 17px;
}

.channel-direction,
.channel-fields {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.section-media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #e9ecf1;
  margin-bottom: 26px;
}

.section-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  height: auto;
  object-fit: cover;
}

.section-media figcaption {
  padding: 10px 16px;
  background: #ffffff;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

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

.bound-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.bound-name {
  font-size: 16px;
  margin-bottom: 10px;
}

.bound-in,
.bound-out {
  margin: 0 0 6px;
  font-size: 14px;
  color: var(--ink-soft);
}

.bound-in::before {
  content: "收录 ";
  color: var(--brand);
  font-weight: 600;
}

.bound-out::before {
  content: "不收 ";
  color: var(--accent);
  font-weight: 600;
}

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

.map-item {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius);
  padding: 18px 20px 18px 22px;
}

.map-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.map-desc {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

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

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.page-layout.layout-with-aside {
  grid-template-columns: minmax(0, 1fr) 300px;
}

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

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

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

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

.reason-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.reason-name {
  font-size: 16px;
  margin-bottom: 8px;
}

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

.order-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  counter-reset: order;
}

.order-item {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px 18px 56px;
  counter-increment: order;
}

.order-item::before {
  content: counter(order, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 18px;
  font-family: var(--mono);
  font-size: 16px;
  color: var(--accent);
}

.order-name {
  font-size: 16px;
  margin-bottom: 8px;
}

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

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

.guide-steps,
.guide-verify,
.guide-pitfalls,
.guide-related {
  margin-bottom: 48px;
}

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

.step-item {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 20px 18px;
  border-top: 3px solid var(--brand);
  counter-increment: step;
}

.step-index {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--brand);
  background: #eef3ff;
  border-radius: 4px;
  padding: 2px 8px;
}

.step-index::before {
  content: "步骤 ";
}

.step-name {
  font-size: 16px;
  margin-bottom: 10px;
}

.step-body {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.step-done {
  margin: 0;
  font-size: 13px;
  color: var(--accent);
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}

.guide-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #e9ecf1;
  margin-bottom: 26px;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 21 / 9;
  height: auto;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 10px 16px;
  background: #ffffff;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

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

.verify-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.verify-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.verify-body {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.pitfall-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.pitfall-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0 18px;
}

.pitfall-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 52px;
  padding: 12px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.pitfall-summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--mono);
  font-size: 17px;
  color: var(--accent);
}

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

.pitfall-item[open] .pitfall-summary {
  border-bottom: 1px solid var(--line);
}

.pitfall-body {
  margin: 0;
  padding: 12px 0 16px;
  font-size: 14px;
  color: var(--ink-soft);
}

.related-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.related-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.related-link {
  display: inline-block;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.related-desc {
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ============ pages: fields ============ */

.field-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #e9ecf1;
  margin-bottom: 32px;
}

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

.field-figure figcaption {
  padding: 10px 16px;
  background: #ffffff;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

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

.field-table {
  min-width: 560px;
  font-size: 15px;
}

.table-caption {
  caption-side: top;
  text-align: left;
  padding: 14px 18px;
  font-size: 13px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}

.field-table thead th {
  background: #eef1f6;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.field-table tbody td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  vertical-align: top;
}

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

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

.field-table tbody tr:hover {
  background: #f7f9fd;
}

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

.section-boundary .boundary-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.boundary-title {
  font-size: 16px;
  margin-bottom: 8px;
}

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

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

.channel-field-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.channel-field-title {
  font-size: 16px;
  margin-bottom: 8px;
}

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

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

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding-top: 48px;
  padding-bottom: 64px;
}

.error-panel {
  max-width: 640px;
  width: 100%;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px 32px 32px;
  text-align: left;
}

.error-code {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--accent);
}

.error-panel h1 {
  font-size: 28px;
  margin-bottom: 14px;
}

.error-desc {
  color: var(--ink-soft);
  font-size: 15px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 18px;
}

.error-note {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

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

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1.4fr 1fr 1fr;
    row-gap: 28px;
  }

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

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

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

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

@media (max-width: 900px) {
  .page-layout,
  .page-layout.layout-with-aside {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-layout .page-aside,
  .page-layout .content-aside {
    order: -1;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 12px;
    padding: 10px 16px;
    min-height: 0;
  }

  .site-nav {
    order: 3;
    flex: 1 1 100%;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px 0 4px;
  }

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

  .nav-list a {
    min-height: 46px;
    padding: 0 12px;
    font-size: 15px;
  }

  .nav-list a.is-current {
    box-shadow: inset 3px 0 0 var(--brand);
  }

  .header-tools {
    margin-left: auto;
  }

  .tool-link {
    min-height: 40px;
    padding: 0 10px;
    font-size: 13px;
  }

  .site-main {
    padding: 0 16px 44px;
  }

  .breadcrumb {
    padding-top: 14px;
  }

  .page-header {
    padding: 16px 0 20px;
    margin-bottom: 24px;
  }

  .page-title {
    font-size: 25px;
  }

  .section {
    margin-bottom: 36px;
  }

  .section-title {
    font-size: 20px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding: 28px 0 32px;
    margin-bottom: 36px;
  }

  .hero-title {
    font-size: 27px;
  }

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

  .channel-row,
  .section-channels-table .channel-row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 14px 16px;
  }

  .channel-row-head {
    display: none;
  }

  .channel-row .col-name,
  .section-channels-table .channel-name {
    font-size: 16px;
  }

  .field-boundary-cols,
  .topic-grid,
  .section-topics-overview .topic-grid,
  .bound-list,
  .map-list,
  .reason-list,
  .order-list,
  .verify-list,
  .pitfall-list,
  .channel-field-grid,
  .section-boundary .boundary-list,
  .log-groups,
  .index-grid,
  .step-list,
  .related-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 22px 16px 8px;
  }

  .back-to-main,
  .footer-copy {
    padding-left: 16px;
    padding-right: 16px;
  }

  .error-panel {
    padding: 26px 20px 24px;
  }

  .error-panel h1 {
    font-size: 23px;
  }

  .field-table {
    min-width: 520px;
  }
}

@media (max-width: 420px) {
  .hero-title {
    font-size: 24px;
  }

  .page-title {
    font-size: 23px;
  }

  .log-list .log-item {
    grid-template-columns: 60px 1fr;
  }

  .field-key {
    flex-basis: 72px;
  }
}

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

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