:root {
  --color-primary: #1F3A34;
  --color-primary-soft: #2E524A;
  --color-bg: #F5F2ED;
  --color-surface: #FFFFFF;
  --color-accent: #B5533C;
  --color-text: #232323;
  --color-text-soft: #5C5C5C;
  --color-border: #D8D2C8;
  --color-border-strong: #B9B1A4;
  --container: 1120px;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-soft: 0 1px 2px rgba(31, 58, 52, 0.06);
  --shadow-lift: 0 6px 18px rgba(31, 58, 52, 0.12);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", 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: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
figure,
ul,
ol,
table {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

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

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

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

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

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

time {
  font-style: normal;
}

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

.site-body {
  display: block;
  min-height: 100vh;
  background-color: var(--color-bg);
}

.site-main {
  display: block;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px 64px;
}

.inner-main {
  padding-top: 20px;
}

.home-main {
  padding-top: 0;
}

/* 顶部事实说明条 */

.site-notice {
  background-color: var(--color-primary);
  color: #E7E2D8;
}

.site-notice p {
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px 24px;
  font-size: 14px;
  line-height: 1.6;
}

/* 页头与主导航 */

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-primary);
  font-weight: 700;
}

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

.brand-mark {
  font-size: 20px;
  line-height: 1.2;
}

.brand-sub {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-text-soft);
  padding-left: 10px;
  border-left: 1px solid var(--color-border);
}

.site-nav {
  display: block;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.4;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  background-color: rgba(31, 58, 52, 0.07);
  color: var(--color-primary);
}

.nav-link.is-current {
  color: var(--color-primary);
  font-weight: 700;
  box-shadow: inset 0 -2px 0 var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

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

/* 面包屑 */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 4px 0 14px;
  font-size: 14px;
  color: var(--color-text-soft);
}

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

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

/* 页面标题区 */

.page-header {
  padding: 4px 0 22px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-primary);
}

.page-description {
  max-width: 860px;
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

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

/* 通用 section 与标题 */

.section {
  margin-top: 56px;
}

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

.section-title {
  font-size: 24px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--color-primary);
}

.section-desc {
  max-width: 820px;
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.section-desc a,
.section-intro a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.section-intro {
  max-width: 820px;
  margin-bottom: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.section-more {
  margin-top: 20px;
  font-size: 15px;
}

.section-more a + a {
  margin-left: 18px;
}

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.link-more::after {
  content: "→";
  font-weight: 400;
}

/* 按钮 */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background-color: rgba(31, 58, 52, 0.08);
  color: var(--color-primary);
}

/* 图片容器通用约束 */

.hero-figure,
.topic-figure,
.topic-cover,
.page-figure,
.guide-figure,
.media-figure,
.records-figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background-color: #E6E1D7;
}

.hero-figure img,
.topic-figure img,
.topic-cover img,
.page-figure img,
.guide-figure img,
.media-figure img,
.records-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-figure figcaption,
.page-figure figcaption,
.guide-figure figcaption,
.media-figure figcaption,
.records-figure figcaption,
.topic-cover-caption {
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-soft);
  background-color: var(--color-surface);
}

.topic-cover-caption {
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   components — 通用列表 / 表格 / 卡片
   ========================================================================== */

/* 频道行（首页 + 频道分类页） */

.channel-rows {
  display: block;
  border-top: 1px solid var(--color-border);
}

.channel-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 18px 4px;
  border-bottom: 1px solid var(--color-border);
}

.channel-code,
.channel-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 2px 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
  background-color: rgba(31, 58, 52, 0.08);
  border-radius: var(--radius-sm);
}

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

.channel-name {
  font-size: 18px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-text);
}

.channel-scope {
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

/* 字段表格 */

.field-table {
  width: 100%;
  font-size: 15px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.table-caption,
.field-table-caption {
  padding: 12px 14px;
  text-align: left;
  font-size: 14px;
  color: var(--color-text-soft);
  border-bottom: 1px solid var(--color-border);
}

.field-table th,
.field-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-border);
}

.field-table thead th {
  background-color: rgba(31, 58, 52, 0.06);
  color: var(--color-primary);
  font-weight: 700;
}

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

.field-name {
  width: 32%;
  font-weight: 700;
  color: var(--color-text);
}

.field-desc {
  color: var(--color-text-soft);
  line-height: 1.75;
}

/* 边界 / 说明列表 */

.boundary-list {
  display: block;
}

.boundary-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

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

.boundary-item {
  padding: 16px 18px;
  margin-bottom: 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.boundary-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
}

.boundary-text {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
}

.boundary-basis {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

/* 说明卡片通用 */

.note-item {
  padding: 16px 18px;
  margin-bottom: 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.note-name,
.note-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
}

.note-text {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
}

.note-scene {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

/* 相关入口列表 */

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.related-item a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.related-item a:hover,
.related-item a:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-accent);
  transform: translateY(-2px);
}

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

/* 首屏 */

.hero {
  padding: 40px 0 8px;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 32px;
  align-items: start;
}

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

.hero-eyebrow {
  display: inline-block;
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: rgba(181, 83, 60, 0.1);
  border-radius: var(--radius-sm);
}

.hero-title {
  margin-top: 16px;
  font-size: 34px;
  line-height: 1.3;
  font-weight: 700;
  color: var(--color-primary);
}

.hero-text {
  margin-top: 16px;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

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

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

.hero-figure {
  border: 1px solid var(--color-border);
}

.hero-figure img {
  aspect-ratio: 16 / 10;
}

/* 频道索引速览面板 */

.hero-panel {
  margin-top: 32px;
  padding: 22px 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}

.panel-title {
  font-size: 18px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.panel-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px 20px;
  margin-top: 16px;
}

.panel-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 32px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--color-border);
}

.panel-code {
  flex: none;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  background-color: rgba(31, 58, 52, 0.08);
  border-radius: var(--radius-sm);
}

.panel-name {
  min-width: 0;
  font-size: 14px;
  color: var(--color-text);
}

.panel-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

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

/* 专题片单入口 */

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

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

.topic-card:hover,
.topic-card:focus-within {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.topic-figure {
  border-radius: 0;
}

.topic-figure img {
  aspect-ratio: 16 / 9;
}

.topic-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 18px 20px 20px;
}

.topic-name {
  font-size: 18px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.topic-theme {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.topic-link {
  margin-top: 14px;
  align-self: flex-start;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* 浏览顺序四步 */

.step-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.step-item {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius);
}

.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.step-name {
  margin-top: 12px;
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.step-cond {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

/* 字段口径与收录边界摘要 */

.fields-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: 24px;
  align-items: start;
}

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

.col-title {
  margin-bottom: 14px;
  font-size: 18px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.col-note {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

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

/* 整理记录速览 */

.record-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

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

.record-month {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.record-list {
  margin-top: 12px;
}

.record-item {
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-border);
}

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

.record-date {
  display: block;
  font-size: 13px;
  color: var(--color-text-soft);
}

.record-text {
  margin-top: 4px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
}

.record-tag {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 8px;
  font-size: 12px;
  color: var(--color-primary);
  background-color: rgba(31, 58, 52, 0.08);
  border-radius: var(--radius-sm);
}

/* 站内栏目索引 */

.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.index-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 88px;
  padding: 16px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.index-cell:hover,
.index-cell:focus-visible {
  border-color: var(--color-accent);
  border-left-color: var(--color-accent);
  transform: translateY(-2px);
}

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

.index-desc {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

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

.page-figure {
  margin-top: 24px;
  border: 1px solid var(--color-border);
}

.page-figure img {
  aspect-ratio: 21 / 9;
}

.channel-index {
  margin-top: 40px;
}

.channel-blocks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
}

.channel-block {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.block-title {
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.entry-list {
  margin-top: 12px;
}

.entry-item {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
}

.entry-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background-color: var(--color-primary);
  border-radius: 50%;
}

.block-scene {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.channel-tips {
  margin-top: 56px;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.tip-card {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius);
}

.tip-title {
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.tip-text {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
}

.tip-scene {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

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

.topic-list-section {
  margin-top: 40px;
}

.topic-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 18px;
}

.topic-cover {
  border-radius: 0;
}

.topic-cover img {
  aspect-ratio: 16 / 9;
}

.topic-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 18px 20px 20px;
}

.topic-card-body .topic-name a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.topic-meta {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.topic-detail-section {
  margin-top: 56px;
}

.topic-detail {
  padding: 20px 22px;
  margin-bottom: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius);
}

.topic-detail-name {
  font-size: 18px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.topic-detail-theme {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-accent);
}

.topic-detail-body {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
}

.topic-detail-list {
  margin-top: 12px;
}

.topic-detail-list li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.topic-detail-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background-color: var(--color-border-strong);
  border-radius: 50%;
}

.topic-logic-section {
  margin-top: 56px;
}

.topic-logic-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.logic-item {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.logic-name {
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.logic-body {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
}

.logic-fit {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

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

.guide-steps {
  margin-top: 40px;
}

.step-track {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.guide-prepare {
  margin-top: 56px;
}

.guide-figure {
  margin-bottom: 22px;
  border: 1px solid var(--color-border);
}

.guide-figure img {
  aspect-ratio: 21 / 9;
}

.prepare-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.prepare-item {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.prepare-name {
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.prepare-label {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
}

.prepare-text {
  margin-top: 4px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text-soft);
}

.guide-faq {
  margin-top: 56px;
}

.faq-item {
  margin-bottom: 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.faq-question {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 14px 18px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::before {
  content: "+";
  flex: none;
  width: 20px;
  margin-right: 10px;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-accent);
}

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

.faq-answer {
  padding: 0 18px 16px 48px;
  border-top: 1px solid var(--color-border);
}

.faq-answer p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

.guide-related {
  margin-top: 56px;
}

/* ==========================================================================
   pages — 字段口径
   ========================================================================== */

.page-layout {
  display: block;
}

.section-field-table,
.section-boundary,
.section-field-notes,
.section-related {
  margin-top: 48px;
}

.field-figure {
  margin-bottom: 20px;
  border: 1px solid var(--color-border);
}

.field-figure img {
  aspect-ratio: 21 / 9;
}

.field-table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.notes-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.section-related .related-list {
  margin-top: 4px;
}

/* ==========================================================================
   pages — 整理记录
   ========================================================================== */

.records-figure {
  margin-top: 24px;
  border: 1px solid var(--color-border);
}

.records-figure img {
  aspect-ratio: 21 / 9;
}

.records-months {
  margin-top: 40px;
}

.month-group {
  padding: 20px 22px;
  margin-bottom: 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.month-title {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  font-size: 18px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.month-list {
  margin-top: 6px;
}

.month-item {
  padding: 14px 0;
  border-bottom: 1px dashed var(--color-border);
}

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

.month-item .record-date {
  display: inline-block;
  padding: 2px 8px;
  font-size: 13px;
  color: var(--color-primary);
  background-color: rgba(31, 58, 52, 0.08);
  border-radius: var(--radius-sm);
}

.month-item .record-text {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
}

.record-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.record-type,
.record-channel {
  padding: 2px 8px;
  font-size: 12px;
  line-height: 1.6;
  border-radius: var(--radius-sm);
}

.record-type {
  color: var(--color-accent);
  background-color: rgba(181, 83, 60, 0.1);
}

.record-channel {
  color: var(--color-text-soft);
  background-color: rgba(31, 58, 52, 0.06);
}

.records-types {
  margin-top: 56px;
}

.types-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.type-card {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius);
}

.type-name {
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

.type-desc {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-text);
}

.type-scene {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

.records-notes {
  margin-top: 56px;
}

.related-links {
  margin-top: 26px;
}

.related-title {
  margin-bottom: 12px;
  font-size: 17px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--color-primary);
}

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

.error-main {
  padding-top: 40px;
}

.error-block {
  padding: 32px 28px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
}

.error-code {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
}

.error-title {
  margin-top: 10px;
  font-size: 28px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--color-primary);
}

.error-text {
  max-width: 720px;
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-soft);
}

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

.error-paths {
  margin-top: 48px;
}

.error-path-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.error-path-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.error-path-list a:hover,
.error-path-list a:focus-visible {
  border-color: var(--color-primary);
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* ==========================================================================
   layout — 页脚
   ========================================================================== */

.site-footer {
  margin-top: 72px;
  background-color: var(--color-primary);
  color: #E7E2D8;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 32px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 24px 28px;
}

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

.footer-name {
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
}

.footer-text {
  margin-top: 10px;
  max-width: 520px;
  font-size: 14px;
  line-height: 1.8;
  color: #CFC9BD;
}

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

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

.footer-group-title {
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
}

.footer-list {
  margin-top: 12px;
}

.footer-list li + li {
  margin-top: 6px;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 14px;
  color: #CFC9BD;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: #FFFFFF;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.16);
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px;
  font-size: 13px;
  line-height: 1.7;
  color: #B6AFA2;
}

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

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .hero-title {
    font-size: 30px;
  }

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

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

@media (max-width: 768px) {
  .site-main {
    padding: 0 16px 48px;
  }

  .site-notice p {
    padding: 8px 16px;
    font-size: 13px;
  }

  .header-inner {
    flex-wrap: wrap;
    padding: 12px 16px;
  }

  .brand-sub {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

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

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

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

  .nav-link {
    width: 100%;
    padding: 0 10px;
    border-radius: 0;
  }

  .nav-link.is-current {
    box-shadow: inset 3px 0 0 var(--color-accent);
  }

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

  .section {
    margin-top: 40px;
  }

  .section-title {
    font-size: 21px;
  }

  .hero {
    padding-top: 28px;
  }

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

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

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

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

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

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

  .step-list,
  .step-track,
  .channel-blocks,
  .tips-grid,
  .topic-logic-list,
  .prepare-list,
  .notes-list,
  .types-grid,
  .record-groups,
  .error-path-list {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .field-table th,
  .field-table td {
    padding: 10px 12px;
  }

  .field-name {
    width: 38%;
  }

  .faq-answer {
    padding-left: 18px;
  }

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

  .footer-inner {
    padding: 32px 16px 24px;
  }

  .footer-copy {
    padding: 14px 16px;
  }

  .error-block {
    padding: 24px 18px;
  }

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

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

  .hero-actions .btn,
  .error-actions .btn {
    width: 100%;
  }
}

/* 滚动进入视口的轻量淡入，默认可见，不依赖 JS 显示正文 */

@media (prefers-reduced-motion: no-preference) {
  .section,
  .hero-panel {
    animation: rise-in 0.4s ease-out both;
  }
}

@keyframes rise-in {
  from {
    transform: translateY(8px);
  }
  to {
    transform: translateY(0);
  }
}