:root {
  --color-primary: #1f3a5f;
  --color-primary-soft: #2c4f7c;
  --color-accent: #2e7d6f;
  --color-mark: #c05621;
  --color-bg: #f5f7fa;
  --color-card: #ffffff;
  --color-text: #2d3748;
  --color-muted: #5b6878;
  --color-border: #dde3ea;
  --color-border-strong: #c3ccd7;
  --container: 1200px;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-sm: 0 1px 2px rgba(31, 58, 95, 0.06);
  --shadow-md: 0 2px 8px rgba(31, 58, 95, 0.08);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", Arial, sans-serif;
  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", Arial, sans-serif;
}

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

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-head);
  color: var(--color-primary);
  font-weight: 700;
  line-height: 1.35;
}

p {
  margin: 0;
}

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

a {
  color: var(--color-primary-soft);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover,
a:focus-visible {
  color: var(--color-mark);
}

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

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

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

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

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

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
}

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

.header-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 12px 24px;
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 40px;
}

.inner-main {
  padding-top: 18px;
}

.site-footer {
  flex: 0 0 auto;
  margin-top: 32px;
  background-color: var(--color-primary);
  color: #d7e0ea;
  font-size: 14px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1.2fr;
  gap: 24px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 32px 24px 20px;
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  color: #a9b8c9;
  font-size: 13px;
}

/* 顶部线索说明条 */
.site-lead,
.top-hint {
  background-color: var(--color-primary);
  color: #d7e0ea;
  font-size: 13px;
}

.site-lead {
  padding: 8px 24px;
  text-align: center;
}

.top-hint {
  padding: 8px 24px;
}

.top-hint p {
  max-width: var(--container);
  margin: 0 auto;
}

/* ===================================================
   components — 页头 / 导航
   =================================================== */

.site-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
  color: var(--color-primary);
}

.site-brand:hover,
.site-brand:focus-visible {
  color: var(--color-primary);
}

.brand-name {
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-slogan {
  color: var(--color-muted);
  font-size: 12px;
  line-height: 1.2;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

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

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

.nav-link {
  display: block;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-size: 15px;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  background-color: #eef2f7;
  color: var(--color-primary);
}

.nav-link.is-current {
  background-color: var(--color-primary);
  color: #ffffff;
}

/* ===================================================
   components — 通用按钮 / 链接
   =================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-primary-soft);
  color: #ffffff;
}

.btn-ghost {
  border: 1px solid var(--color-border-strong);
  background-color: var(--color-card);
  color: var(--color-primary);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--color-mark);
  color: var(--color-mark);
}

.text-link {
  color: var(--color-primary-soft);
  font-weight: 600;
  border-bottom: 1px solid var(--color-border-strong);
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--color-mark);
  border-bottom-color: var(--color-mark);
}

/* ===================================================
   components — 区块标题
   =================================================== */

.section-head {
  margin-bottom: 18px;
}

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

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

.section-foot {
  margin-top: 16px;
  font-size: 14px;
}

.section {
  margin-bottom: 36px;
}

.section-media,
.section-figure,
.content-figure {
  margin: 0 0 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--color-card);
}

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

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

/* ===================================================
   components — 面包屑 / 页面标题区
   =================================================== */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--color-muted);
  font-size: 13px;
}

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

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

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

.page-header {
  margin-bottom: 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 28px;
  line-height: 1.3;
}

.page-description {
  margin-top: 10px;
  max-width: 860px;
  color: var(--color-muted);
}

/* ===================================================
   components — 内页两栏布局
   =================================================== */

.page-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.page-sidebar,
.page-aside,
.layout-sidebar {
  position: sticky;
  top: 84px;
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
}

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

.sidebar-title,
.aside-title {
  margin-bottom: 10px;
  font-size: 15px;
  color: var(--color-primary);
}

.sidebar-title + .sidebar-nav + .sidebar-title {
  margin-top: 18px;
}

.sidebar-nav,
.aside-nav {
  margin-bottom: 14px;
}

.sidebar-list,
.aside-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-list a,
.aside-list a {
  display: block;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 14px;
}

.sidebar-list a:hover,
.sidebar-list a:focus-visible,
.aside-list a:hover,
.aside-list a:focus-visible {
  background-color: #eef2f7;
  color: var(--color-primary);
}

.sidebar-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 14px;
}

.sidebar-tags a {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  font-size: 13px;
}

.sidebar-tags a:hover,
.sidebar-tags a:focus-visible {
  border-color: var(--color-accent);
}

.sidebar-note {
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}

.sidebar-note-title,
.sidebar-subtitle {
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--color-primary);
}

.sidebar-block {
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

/* ===================================================
   components — 频道行 / 专题卡 / 步骤 / 表格
   =================================================== */

.channel-rows {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.channel-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.channel-no,
.channel-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: start;
  min-height: 28px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background-color: #eef2f7;
  color: var(--color-primary);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.channel-name {
  font-size: 18px;
}

.channel-scope {
  margin-top: 6px;
  color: var(--color-text);
}

.channel-sample {
  margin-top: 6px;
  color: var(--color-muted);
  font-size: 13px;
}

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

.channel-body p {
  margin-top: 6px;
  color: var(--color-text);
}

.channel-body p + p {
  color: var(--color-muted);
  font-size: 13px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.topic-card {
  display: flex;
  flex-direction: column;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.topic-media {
  margin: 0;
  background-color: #eef2f7;
}

.topic-media img {
  width: 100%;
  height: 168px;
  object-fit: cover;
}

.topic-name {
  margin: 14px 16px 0;
  font-size: 18px;
}

.topic-brief {
  margin: 8px 16px 0;
  color: var(--color-text);
}

.topic-meta {
  margin: 10px 16px 16px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
}

.topic-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 16px 16px;
}

.topic-body .topic-name {
  margin: 0;
}

.topic-body .topic-brief {
  margin: 0;
}

.topic-body .topic-meta {
  margin: 0;
}

.topic-tag {
  align-self: flex-start;
  padding: 3px 9px;
  border-radius: var(--radius-sm);
  background-color: #e8f3f0;
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 600;
}

.topic-desc {
  color: var(--color-muted);
  font-size: 13px;
}

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

.flow-step {
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius);
}

.step-no,
.step-index {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 9px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: #ffffff;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
}

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

.step-note {
  margin-top: 8px;
  color: var(--color-mark);
  font-size: 13px;
  font-weight: 600;
}

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

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

.facts-col {
  min-width: 0;
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.col-title {
  margin-bottom: 12px;
  font-size: 17px;
}

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

.field-table caption {
  padding-bottom: 10px;
  color: var(--color-muted);
  font-size: 13px;
  text-align: left;
}

.field-table th,
.field-table td {
  padding: 9px 12px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.field-table thead th {
  background-color: #eef2f7;
  color: var(--color-primary);
  font-weight: 700;
  white-space: nowrap;
}

.field-table tbody tr:nth-child(even) {
  background-color: #fafbfd;
}

.table-wrap {
  overflow-x: auto;
}

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

.log-group {
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.log-month {
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
  font-size: 16px;
}

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

.log-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.log-date {
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
}

.log-text {
  color: var(--color-text);
  font-size: 14px;
}

/* ===================================================
   components — 站内索引 / 相关任务带
   =================================================== */

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

.index-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 14px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

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

.index-name {
  color: var(--color-primary);
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
}

.index-desc {
  color: var(--color-muted);
  font-size: 13px;
}

.task-band,
.section-related,
.related-band {
  margin-top: 8px;
  padding: 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
}

.task-band-title {
  margin-bottom: 12px;
  font-size: 18px;
}

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

.task-link,
.related-list a,
.related-item a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 44px;
  padding: 12px 14px;
  background-color: #f7f9fc;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-primary);
  font-size: 14px;
  font-weight: 600;
}

.task-link:hover,
.task-link:focus-visible,
.related-list a:hover,
.related-list a:focus-visible,
.related-item a:hover,
.related-item a:focus-visible {
  border-color: var(--color-mark);
  color: var(--color-mark);
}

.related-list li {
  display: flex;
}

.related-list a {
  width: 100%;
}

/* ===================================================
   components — 页脚
   =================================================== */

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

.footer-name {
  margin-bottom: 8px;
  color: #ffffff;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
}

.footer-desc {
  color: #a9b8c9;
  font-size: 13px;
}

.footer-title {
  margin-bottom: 10px;
  color: #ffffff;
  font-size: 14px;
}

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

.footer-list a {
  color: #c8d4e0;
  font-size: 13px;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: #ffffff;
}

.footer-note {
  color: #a9b8c9;
  font-size: 13px;
}

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

.hero-section {
  margin-bottom: 40px;
  padding: 28px 0 0;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

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

.hero-eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background-color: #e8f3f0;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
}

.hero-title {
  font-size: 28px;
  line-height: 1.35;
}

.hero-text {
  margin-top: 12px;
  color: var(--color-text);
}

.hero-text + .hero-text {
  color: var(--color-muted);
  font-size: 14px;
}

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

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

.hero-media img {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.hero-media figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}

.hero-panels {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.hero-panel {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.panel-title {
  margin-bottom: 10px;
  font-size: 17px;
}

.panel-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.panel-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--color-border);
  font-size: 14px;
}

.panel-key {
  flex: 0 0 auto;
  min-width: 76px;
  color: var(--color-accent);
  font-weight: 600;
}

.panel-more {
  margin-top: auto;
  align-self: flex-start;
  color: var(--color-primary-soft);
  font-size: 14px;
  font-weight: 600;
  border-bottom: 1px solid var(--color-border-strong);
}

.panel-more:hover,
.panel-more:focus-visible {
  color: var(--color-mark);
  border-bottom-color: var(--color-mark);
}

.channels-section,
.topics-section,
.flow-section,
.facts-section,
.log-section,
.index-section {
  margin-bottom: 40px;
}

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

.channel-overview .channel-rows {
  margin-top: 4px;
}

.channel-detail {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.channel-detail .section-title,
.channel-detail .section-desc {
  grid-column: 1 / -1;
}

.channel-note {
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.channel-note-title {
  margin-bottom: 8px;
  font-size: 17px;
}

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

.advice-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.advice-col {
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.advice-title {
  margin-bottom: 10px;
  font-size: 16px;
}

.advice-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.advice-list li {
  position: relative;
  padding-left: 14px;
  color: var(--color-text);
  font-size: 14px;
}

.advice-list li::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

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

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

.sequence-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sequence-item {
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
}

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

.sequence-order {
  margin-top: 8px;
  color: var(--color-mark);
  font-size: 13px;
  font-weight: 600;
}

.sequence-advice {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
}

.relation-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.relation-col {
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.relation-title {
  margin-bottom: 10px;
  font-size: 16px;
}

.relation-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.relation-list li {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  background-color: #f7f9fc;
  color: var(--color-text);
  font-size: 14px;
}

/* ===================================================
   pages — 浏览指引
   =================================================== */

.step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.step-item {
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius);
}

.step-text {
  margin-top: 8px;
  color: var(--color-muted);
  font-size: 14px;
}

.confirm-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.confirm-item {
  padding: 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

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

.confirm-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.confirm-list li {
  position: relative;
  padding-left: 14px;
  color: var(--color-text);
  font-size: 14px;
}

.confirm-list li::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-mark);
}

.faq-group {
  margin-bottom: 18px;
}

.faq-group-title {
  margin-bottom: 10px;
  padding-left: 10px;
  border-left: 3px solid var(--color-primary);
  font-size: 17px;
}

.faq-item {
  margin-bottom: 8px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

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

.faq-question {
  padding: 13px 16px;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "＋";
  float: right;
  color: var(--color-mark);
  font-weight: 700;
}

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

.faq-answer {
  padding: 0 16px 14px;
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
  color: var(--color-muted);
  font-size: 14px;
}

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

.content-section {
  margin-bottom: 32px;
}

.content-section h2 {
  margin-bottom: 10px;
  font-size: 22px;
}

.content-section > p {
  margin-bottom: 14px;
  color: var(--color-text);
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.boundary-item {
  padding: 14px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-mark);
  border-radius: var(--radius);
}

.boundary-name {
  margin-bottom: 6px;
  font-size: 16px;
}

.boundary-item p {
  color: var(--color-muted);
  font-size: 14px;
}

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

.note-item {
  padding: 14px 16px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

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

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

.section-tail {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 14px;
}

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

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

.error-panel {
  width: 100%;
  max-width: 720px;
  padding: 32px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.error-code {
  margin-bottom: 12px;
  color: var(--color-mark);
  font-family: var(--font-head);
  font-size: 44px;
  font-weight: 700;
  line-height: 1;
}

.error-panel h1 {
  font-size: 26px;
}

.error-lead {
  margin-top: 12px;
  color: var(--color-muted);
}

.error-hint-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 20px;
}

.error-hint-list li {
  position: relative;
  padding-left: 16px;
  color: var(--color-text);
  font-size: 14px;
}

.error-hint-list li::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

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

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

  .hero-media img {
    height: 240px;
  }

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

  .page-sidebar,
  .page-aside,
  .layout-sidebar {
    position: static;
    order: 2;
  }

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

  .sidebar-list,
  .aside-list {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 8px;
    padding-bottom: 6px;
  }

  .sidebar-list li,
  .aside-list li {
    flex: 0 0 auto;
  }

  .sidebar-list a,
  .aside-list a {
    white-space: nowrap;
    border: 1px solid var(--color-border);
  }
}

@media (max-width: 768px) {
  .site-main {
    padding: 0 16px 32px;
  }

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

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    order: 3;
    flex: 0 0 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 8px 0 4px;
    border-top: 1px solid var(--color-border);
  }

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

  .nav-link {
    padding: 12px 10px;
    font-size: 16px;
  }

  .site-lead,
  .top-hint {
    padding: 8px 16px;
  }

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

  .footer-copy {
    padding: 12px 16px 20px;
  }

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

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

  .hero-panels,
  .topic-grid,
  .facts-columns,
  .log-groups,
  .channel-detail,
  .relation-columns,
  .confirm-grid,
  .note-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .flow-steps,
  .step-list,
  .advice-columns,
  .task-list,
  .related-list,
  .index-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .channel-no,
  .channel-code {
    justify-self: start;
  }

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

  .section-media img,
  .section-figure img,
  .content-figure img {
    height: 200px;
  }

  .error-panel {
    padding: 22px 18px;
  }

  .error-code {
    font-size: 36px;
  }

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

  .content-section h2 {
    font-size: 20px;
  }
}

@media (max-width: 420px) {
  .hero-actions .btn,
  .error-actions .btn {
    width: 100%;
  }

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

  .brand-slogan {
    font-size: 11px;
  }
}