:root {
  --bg-page: #f7f8fa;
  --bg-card: #ffffff;
  --c-title: #1c1f24;
  --c-text: #3a3f47;
  --c-accent: #2f6fd0;
  --c-line: #e3e6ea;
  --c-soft: #eef1f4;
  --c-muted: #6b7280;
  --w-content: 1120px;
  --radius: 6px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

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

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

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

body.site-body {
  margin: 0;
  background: var(--bg-page);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
dd,
figure,
blockquote {
  margin: 0;
}

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

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

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

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

caption {
  text-align: left;
}

/* ==========================================================================
   layout —— 全站骨架
   ========================================================================== */

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

.header-inner {
  max-width: var(--w-content);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-size: 19px;
  font-weight: 700;
  color: var(--c-title);
  letter-spacing: 0;
  white-space: nowrap;
}

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

.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

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

.nav-list > li > a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 15px;
  color: var(--c-text);
  border-bottom: 2px solid transparent;
  line-height: 1.4;
}

.nav-list > li > a:hover,
.nav-list > li > a:focus-visible {
  color: var(--c-accent);
  text-decoration: none;
}

.nav-list > li > a.is-current {
  color: var(--c-title);
  font-weight: 600;
  border-bottom-color: var(--c-accent);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--bg-card);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

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

.site-main {
  display: block;
}

.home-main,
.inner-main {
  max-width: var(--w-content);
  margin: 0 auto;
  padding: 32px 24px 56px;
}

.section {
  margin-top: 40px;
}

.section:first-child {
  margin-top: 0;
}

.section-head {
  margin-bottom: 16px;
}

.section-head h2,
.section-title,
.section h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-title);
  line-height: 1.5;
}

.section-desc,
.section-intro,
.section-lead {
  margin-top: 6px;
  font-size: 15px;
  color: var(--c-text);
  max-width: 760px;
}

.section-media,
.media-figure,
.records-media {
  margin-top: 18px;
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.section-media img,
.media-figure img,
.records-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.section-media figcaption,
.media-figure figcaption,
.records-media figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--c-muted);
  border-top: 1px solid var(--c-line);
}

/* 通用表格 */
.table-scroll {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.data-table,
.field-table {
  min-width: 560px;
  font-size: 14px;
}

.data-table .table-caption,
.field-table caption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--c-muted);
  border-bottom: 1px solid var(--c-line);
}

.data-table th,
.data-table td,
.field-table th,
.field-table td {
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--c-line);
  vertical-align: top;
}

.data-table thead th,
.field-table thead th {
  background: var(--c-soft);
  color: var(--c-title);
  font-weight: 600;
  white-space: nowrap;
}

.data-table tbody th {
  color: var(--c-title);
  font-weight: 600;
}

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

.data-table tbody tr:hover,
.field-table tbody tr:hover {
  background: #fafbfc;
}

/* 页脚 */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--c-line);
  margin-top: 24px;
}

.footer-inner {
  max-width: var(--w-content);
  margin: 0 auto;
  padding: 36px 24px 24px;
  display: grid;
  grid-template-columns: 1.4fr repeat(4, 1fr);
  gap: 28px;
}

.footer-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-title);
}

.footer-desc {
  margin-top: 8px;
  font-size: 14px;
  color: var(--c-muted);
}

.footer-heading {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-title);
  margin-bottom: 10px;
}

.footer-group ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.footer-group a:hover,
.footer-group a:focus-visible {
  color: var(--c-accent);
}

.footer-bottom {
  max-width: var(--w-content);
  margin: 0 auto;
  padding: 14px 24px 28px;
  border-top: 1px solid var(--c-line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

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

.back-to-top {
  font-size: 13px;
  color: var(--c-accent);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

/* ==========================================================================
   components —— 通用组件
   ========================================================================== */

/* 面包屑与页面标题区 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-muted);
  margin-bottom: 16px;
}

.breadcrumb-sep {
  color: #b9c0c8;
}

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

.page-header {
  margin-bottom: 28px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--c-line);
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--c-title);
  line-height: 1.4;
}

.page-description {
  margin-top: 10px;
  font-size: 15px;
  color: var(--c-text);
  max-width: 780px;
}

/* 编号步骤清单 */
.step-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-item {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 14px 18px;
}

.step-index,
.step-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-accent);
  min-width: 26px;
}

.step-body {
  flex: 1 1 auto;
  min-width: 0;
}

.step-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-title);
  line-height: 1.5;
}

.step-body p,
.step-text {
  margin-top: 4px;
  font-size: 15px;
}

/* 条目式列表 */
.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.boundary-list li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
}

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 12px;
  width: 5px;
  height: 5px;
  background: var(--c-accent);
  border-radius: 50%;
}

/* 侧栏通用 */
.aside-block {
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.aside-block + .aside-block {
  margin-top: 20px;
}

.aside-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-title);
  margin-bottom: 10px;
}

.aside-note,
.aside-desc,
.aside-text,
.aside-lead {
  font-size: 14px;
  color: var(--c-text);
}

.aside-note + .index-list,
.aside-desc + .table-scroll {
  margin-top: 10px;
}

.index-list,
.side-links,
.aside-list,
.guide-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.index-list a,
.side-links a,
.aside-list a,
.guide-list a {
  font-size: 14px;
  display: inline-block;
  min-height: 26px;
}

/* 页面双栏骨架：默认主内容在前、aside 在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.layout-main,
.content-main {
  min-width: 0;
}

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

/* 侧栏在左：aside 在 DOM 中位于主内容之前 */
.sidebar-left {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

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

/* ==========================================================================
   pages —— 首页
   ========================================================================== */

.hero-section {
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 28px 28px 24px;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.hero-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--c-title);
  line-height: 1.4;
}

.hero-text {
  margin-top: 12px;
  font-size: 15px;
  max-width: 620px;
}

.hero-actions {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  font-size: 15px;
  border-radius: var(--radius);
  border: 1px solid transparent;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #2860b8;
  color: #ffffff;
  text-decoration: none;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--c-accent);
  border-color: var(--c-line);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--c-accent);
  text-decoration: none;
}

.hero-media {
  margin: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--c-soft);
}

.hero-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.hero-paths {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--c-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.path-heading {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-title);
  margin-bottom: 10px;
}

.path-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  counter-reset: path;
}

.path-list li {
  position: relative;
  padding-left: 26px;
  font-size: 14px;
}

.path-list li::before {
  counter-increment: path;
  content: counter(path);
  position: absolute;
  left: 0;
  top: 3px;
  width: 18px;
  height: 18px;
  line-height: 18px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-accent);
  border: 1px solid var(--c-line);
  border-radius: 4px;
}

/* 频道分类方向总览 */
.channel-table tbody th {
  white-space: nowrap;
}

.channel-table td:last-child {
  min-width: 180px;
}

/* 专题片单速览 */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.feature-item:hover {
  background: #fbfcfd;
}

.feature-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-title);
}

.feature-scope,
.feature-rule,
.feature-count {
  margin-top: 8px;
  font-size: 14px;
}

.feature-count {
  color: var(--c-muted);
}

/* 字段与收录边界摘要 */
.field-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

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

.field-subtitle {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-title);
  margin-bottom: 10px;
}

.field-summary .boundary-list {
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 20px;
}

/* 观影路径三步概览 */
.route-overview .step-item {
  background: var(--bg-card);
}

/* 收录范围调整记录摘要 */
.update-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.update-item {
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 14px 18px;
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 6px 18px;
  align-items: start;
}

.update-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-muted);
  grid-row: span 2;
  padding-top: 2px;
}

.update-text {
  font-size: 15px;
}

.update-scope {
  font-size: 13px;
  color: var(--c-muted);
}

/* 站内页面索引 */
.index-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

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

.index-col:hover {
  background: #fbfcfd;
}

.index-name {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.index-name a {
  color: var(--c-title);
}

.index-name a:hover,
.index-name a:focus-visible {
  color: var(--c-accent);
}

.index-col p {
  font-size: 14px;
  color: var(--c-text);
}

/* ==========================================================================
   pages —— 频道分类
   ========================================================================== */

.page-pindao .channel-overview p {
  font-size: 15px;
  margin-top: 8px;
}

.channel-group {
  margin-top: 32px;
}

.channel-group h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-title);
}

.group-note {
  margin-top: 6px;
  font-size: 14px;
  color: var(--c-muted);
}

.channel-rows {
  margin-top: 12px;
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.channel-row {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  padding: 12px 18px;
  border-bottom: 1px solid var(--c-line);
  font-size: 14px;
}

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

.channel-row:hover {
  background: #fafbfc;
}

.channel-name {
  font-weight: 600;
  color: var(--c-title);
}

.channel-field {
  color: var(--c-text);
}

.channel-path .step-list {
  margin-top: 14px;
}

/* ==========================================================================
   pages —— 专题片单
   ========================================================================== */

.section-plan-list .section-desc {
  margin-bottom: 4px;
}

.plan-row {
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-top: 16px;
}

.plan-row:hover {
  background: #fbfcfd;
}

.plan-row-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
}

.plan-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-title);
}

.plan-range {
  font-size: 14px;
  color: var(--c-muted);
}

.plan-meta {
  margin-top: 12px;
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 6px 16px;
  font-size: 14px;
}

.plan-meta dt {
  color: var(--c-muted);
}

.plan-meta dd {
  color: var(--c-text);
}

.plan-link {
  margin-top: 12px;
  font-size: 14px;
}

.plan-link a + a {
  margin-left: 16px;
}

.section-plan-basis {
  margin-top: 40px;
}

.basis-block {
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-top: 14px;
}

.basis-block h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-title);
}

.basis-block p {
  margin-top: 6px;
  font-size: 14px;
}

.basis-list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.basis-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
}

.basis-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 11px;
  width: 5px;
  height: 5px;
  background: var(--c-accent);
  border-radius: 50%;
}

.section-foot {
  margin-top: 20px;
  font-size: 14px;
}

.plan-map-table {
  min-width: 420px;
}

/* ==========================================================================
   pages —— 条目字段说明
   ========================================================================== */

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

.section-fields p,
.section-boundary p,
.section-path-link p {
  margin-top: 8px;
  font-size: 15px;
}

.section-fields .table-scroll,
.section-boundary .boundary-columns {
  margin-top: 16px;
}

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

.boundary-col {
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 20px;
  min-width: 0;
}

.boundary-col h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-title);
  margin-bottom: 10px;
}

.boundary-out h3 {
  color: #8a5a1f;
}

.section-path-link {
  margin-top: 36px;
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.content-side h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--c-title);
}

.content-side p {
  margin-top: 8px;
  font-size: 14px;
}

.content-side h3 {
  margin-top: 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-title);
}

.content-side .side-links {
  margin-top: 10px;
}

/* ==========================================================================
   pages —— 观影路径指引
   ========================================================================== */

.path-steps .step-list {
  margin-top: 16px;
}

.faq-section {
  margin-top: 40px;
}

.faq-group {
  margin-top: 20px;
}

.faq-group-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-title);
  margin-bottom: 10px;
}

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

.faq-item summary {
  cursor: pointer;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-title);
  min-height: 44px;
  display: flex;
  align-items: center;
}

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

.faq-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-accent);
}

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

.faq-item p {
  padding: 0 18px 14px;
  font-size: 14px;
  color: var(--c-text);
}

.trouble-list {
  counter-reset: trouble;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}

.trouble-list li {
  position: relative;
  padding-left: 26px;
  font-size: 14px;
}

.trouble-list li::before {
  counter-increment: trouble;
  content: counter(trouble);
  position: absolute;
  left: 0;
  top: 3px;
  width: 18px;
  height: 18px;
  line-height: 18px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-accent);
  border: 1px solid var(--c-line);
  border-radius: 4px;
}

.related-guides .guide-list {
  margin-top: 10px;
}

/* ==========================================================================
   pages —— 收录范围调整记录
   ========================================================================== */

.records-section .section-intro,
.records-link-section .section-intro {
  margin-top: 6px;
  font-size: 15px;
}

.records-timeline {
  margin-top: 20px;
  border-left: 2px solid var(--c-line);
  padding-left: 22px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.record-item {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 20px;
}

.record-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--bg-card);
  border: 2px solid var(--c-accent);
  border-radius: 50%;
}

.record-date {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-muted);
}

.record-title {
  margin-top: 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--c-title);
}

.record-body {
  margin-top: 8px;
  font-size: 15px;
}

.record-impact,
.record-reason {
  margin-top: 6px;
  font-size: 13px;
  color: var(--c-muted);
}

.records-link-section {
  margin-top: 40px;
}

.records-link-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.records-link-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
}

.records-link-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 11px;
  width: 5px;
  height: 5px;
  background: var(--c-accent);
  border-radius: 50%;
}

.records-link-more {
  margin-top: 16px;
  font-size: 14px;
}

.records-link-more a + a {
  margin-left: 16px;
}

/* ==========================================================================
   pages —— 404
   ========================================================================== */

.error-main {
  max-width: var(--w-content);
  margin: 0 auto;
  padding: 56px 24px 64px;
}

.error-block {
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 32px 28px;
}

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

.error-title {
  margin-top: 8px;
  font-size: 28px;
  font-weight: 700;
  color: var(--c-title);
  line-height: 1.4;
}

.error-text {
  margin-top: 10px;
  font-size: 15px;
  max-width: 720px;
}

.error-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
}

.error-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  background: var(--c-accent);
  color: #ffffff;
  border-radius: var(--radius);
  font-size: 15px;
}

.error-button:hover,
.error-button:focus-visible {
  background: #2860b8;
  color: #ffffff;
  text-decoration: none;
}

.error-link {
  font-size: 14px;
}

.error-guide {
  margin-top: 32px;
}

.error-guide-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--c-title);
}

.error-guide-list {
  margin-top: 14px;
  background: var(--bg-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.error-guide-list a {
  font-size: 14px;
}

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

@media (max-width: 960px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 10px 20px;
    min-height: 0;
    gap: 12px;
  }

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

  .site-nav {
    flex: 1 1 100%;
    justify-content: flex-start;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
    padding-bottom: 8px;
  }

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

  .nav-list > li > a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 0 4px;
    border-bottom: 1px solid var(--c-line);
  }

  .nav-list > li > a.is-current {
    border-bottom-color: var(--c-line);
    color: var(--c-accent);
  }

  .home-main,
  .inner-main {
    padding: 24px 20px 44px;
  }

  .hero-section {
    padding: 22px 20px;
  }

  .hero-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .hero-media img {
    height: 220px;
  }

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

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

  .field-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

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

  .page-layout,
  .layout-shell,
  .sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .sidebar-left .page-aside {
    order: 2;
  }

  .sidebar-left .page-content {
    order: 1;
  }

  .page-layout .layout-aside,
  .layout-shell .content-side {
    order: 2;
  }

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
    padding: 30px 20px 20px;
  }

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

  .footer-bottom {
    padding: 14px 20px 26px;
  }

  .channel-row {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 4px 16px;
  }

  .channel-row .channel-field:last-child {
    grid-column: 2;
  }

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

  .update-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .update-date {
    grid-row: auto;
  }
}

@media (max-width: 640px) {
  body.site-body {
    font-size: 15px;
  }

  .home-main,
  .inner-main {
    padding: 20px 16px 40px;
  }

  .header-inner {
    padding: 10px 16px;
  }

  .brand {
    font-size: 17px;
  }

  .hero-title,
  .page-title,
  .error-title {
    font-size: 22px;
  }

  .section h2,
  .section-head h2,
  .section-title,
  .error-guide-title {
    font-size: 18px;
  }

  .hero-section {
    padding: 18px 16px;
  }

  .hero-media img {
    height: 180px;
  }

  .section-media img,
  .media-figure img,
  .records-media img {
    height: 180px;
  }

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

  .step-item {
    padding: 12px 14px;
    gap: 10px;
  }

  .plan-row,
  .basis-block,
  .record-item,
  .boundary-col,
  .aside-block,
  .index-col {
    padding: 14px 16px;
  }

  .plan-meta {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px;
  }

  .plan-meta dd {
    margin-bottom: 6px;
  }

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

  .record-item::before {
    left: -23px;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 14px 16px 24px;
  }

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

  .channel-row .channel-field:last-child {
    grid-column: auto;
  }

  .plan-link a + a,
  .records-link-more a + a {
    display: inline-block;
    margin-left: 0;
    margin-right: 16px;
  }

  .error-block {
    padding: 22px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}