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

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

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: #2d3136;
  background-color: #f5f6f8;
}

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

a {
  color: #0f766e;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #0b5c56;
}

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

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.35;
}

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

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid #d9e2e8;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #2d3136;
  letter-spacing: 0;
}

.brand-tag {
  font-size: 12px;
  color: #5c6470;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  color: #5c6470;
  border-radius: 6px;
  line-height: 1.5;
  white-space: nowrap;
}

.nav-list li a:hover {
  color: #0f766e;
  background-color: #f0f4f6;
}

.nav-list li a.is-current {
  color: #0f766e;
  font-weight: 700;
  background-color: #ecf3f4;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  align-items: center;
  flex-shrink: 0;
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #2d3136;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-main {
  flex: 1;
  width: 100%;
}

.home-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.inner-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 60px;
  width: 100%;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 0 4px;
  font-size: 13px;
  color: #5c6470;
}

.breadcrumb a {
  color: #5c6470;
}

.breadcrumb a:hover {
  color: #0f766e;
}

.breadcrumb-sep {
  color: #b6c0c7;
  font-size: 12px;
}

.breadcrumb-current {
  color: #2d3136;
  font-weight: 600;
}

.page-header {
  padding: 28px 0 32px;
  border-bottom: 1px solid #d9e2e8;
  margin-bottom: 36px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 12px;
  line-height: 1.3;
}

.page-description {
  font-size: 15px;
  color: #5c6470;
  max-width: 780px;
  line-height: 1.7;
}

.site-footer {
  background-color: #ffffff;
  border-top: 1px solid #d9e2e8;
  margin-top: 60px;
}

.footer-columns {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 20px 36px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
}

.footer-col h2 {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 16px;
}

.footer-col p {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.7;
  max-width: 360px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: #5c6470;
}

.footer-col ul li a:hover {
  color: #0f766e;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  border-top: 1px solid #d9e2e8;
}

.footer-bottom p {
  font-size: 13px;
  color: #7a848e;
  line-height: 1.6;
  text-align: center;
}

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

/* --- 顶部提示条 --- */

.top-notice,
.top-tipbar {
  background-color: #2d3136;
  color: #ffffff;
  padding: 10px 20px;
  text-align: center;
}

.top-notice p,
.top-tipbar p {
  font-size: 13px;
  line-height: 1.5;
  max-width: 1200px;
  margin: 0 auto;
}

/* --- 按钮 --- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 700;
  border-radius: 8px;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  min-height: 44px;
}

.btn-primary {
  background-color: #0f766e;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #0b5c56;
  color: #ffffff;
}

.btn-secondary {
  background-color: #ffffff;
  color: #0f766e;
  border: 1px solid #0f766e;
}

.btn-secondary:hover {
  background-color: #ecf3f4;
  color: #0f766e;
}

/* --- 文本链接 --- */

.text-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.text-link:hover {
  border-bottom-color: #0f766e;
}

/* --- 状态标签 --- */

.status-tag,
.genre-tag,
.tag,
.cat-tag,
.filter-tag,
.myth-label,
.fact-label,
.suggest-label,
.feature-card-tag,
.related-link-name {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
  padding: 3px 10px;
  border-radius: 4px;
  background-color: #ecf3f4;
  color: #0f766e;
  white-space: nowrap;
}

.status-schedule {
  background-color: #eef2f4;
  color: #5c6470;
}

.status-catalog {
  background-color: #ecf3f4;
  color: #0f766e;
}

.status-notice {
  background-color: #fdf3e3;
  color: #a16207;
}

/* --- 首页 hero --- */

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0 48px;
}

.hero-copy h1 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  color: #2d3136;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: #5c6470;
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-figure {
  margin: 0;
}

.hero-figure img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid #d9e2e8;
}

/* --- 首页工具区 --- */

.tools-section {
  padding: 48px 0;
}

.tools-section h2,
.calendar-section h2,
.featured-section h2,
.helper-section h2,
.updates-section h2 {
  font-size: 24px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 20px;
}

.section-desc {
  font-size: 14px;
  color: #5c6470;
  margin-bottom: 24px;
  max-width: 720px;
}

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

.tool-card {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 24px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.tool-card:hover {
  box-shadow: 0 4px 14px rgba(45, 49, 54, 0.08);
  transform: translateY(-2px);
}

.tool-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.tool-card p {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.7;
  margin-bottom: 16px;
}

.tool-card a {
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
}

/* --- 首页内容日历 --- */

.calendar-section {
  padding: 48px 0;
}

.content-calendar {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  overflow: hidden;
  font-size: 13px;
}

.content-calendar thead th {
  background-color: #f0f4f6;
  color: #2d3136;
  font-weight: 700;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid #d9e2e8;
  font-size: 13px;
}

.content-calendar tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid #eef2f4;
  color: #5c6470;
  vertical-align: top;
  line-height: 1.6;
}

.content-calendar tbody tr:last-child td {
  border-bottom: none;
}

.content-calendar tbody tr:hover td {
  background-color: #fafbfc;
}

/* --- 首页篇目封面墙 --- */

.featured-section {
  padding: 48px 0;
}

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

.featured-card {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.featured-card:hover {
  box-shadow: 0 6px 18px rgba(45, 49, 54, 0.1);
  transform: translateY(-4px);
}

.featured-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.featured-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  padding: 16px 16px 8px;
}

.featured-card .genre-tag {
  margin: 0 16px 12px;
}

.featured-card > a {
  display: block;
  padding: 0 16px 16px;
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
}

/* --- 首页阅读辅助入口 --- */

.helper-section {
  padding: 48px 0;
}

.helper-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.helper-card {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 28px;
}

.helper-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.helper-card p {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.7;
  margin-bottom: 16px;
}

.helper-card a {
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
}

/* --- 首页动态摘要 --- */

.updates-section {
  padding: 48px 0;
}

.updates-list {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 0;
  margin-bottom: 20px;
}

.updates-list li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border-bottom: 1px solid #eef2f4;
}

.updates-list li:last-child {
  border-bottom: none;
}

.update-date {
  font-size: 13px;
  color: #5c6470;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.updates-list li a {
  font-size: 14px;
  font-weight: 600;
  color: #2d3136;
}

.updates-list li a:hover {
  color: #0f766e;
}

.more-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
}

/* --- 首页相关链接 --- */

.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 28px 0 40px;
}

.related-links-label {
  font-size: 13px;
  color: #5c6470;
  font-weight: 700;
}

.related-links-item {
  font-size: 13px;
  color: #0f766e;
  padding: 6px 14px;
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 20px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-links-item:hover {
  border-color: #0f766e;
  color: #0f766e;
}

/* --- 题材索引页 --- */

.themes-overview {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 40px;
}

.themes-overview h2 {
  font-size: 22px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 16px;
}

.themes-overview p {
  font-size: 15px;
  color: #5c6470;
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 820px;
}

.themes-overview-media {
  margin: 20px 0;
}

.themes-overview-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: 8px;
}

.themes-overview-media figcaption {
  font-size: 13px;
  color: #7a848e;
  padding-top: 10px;
  text-align: center;
}

.themes-grid-section {
  margin-bottom: 48px;
}

.themes-grid-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 12px;
}

.themes-grid-section > p {
  font-size: 14px;
  color: #5c6470;
  margin-bottom: 24px;
  max-width: 720px;
}

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

.theme-card {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  overflow: hidden;
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 0;
}

.theme-card-media {
  margin: 0;
}

.theme-card-media img {
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
}

.theme-card-body {
  padding: 24px;
}

.theme-card-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.theme-desc {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.7;
  margin-bottom: 14px;
}

.theme-elements {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.theme-elements li {
  font-size: 12px;
  color: #5c6470;
  background-color: #f5f6f8;
  padding: 3px 10px;
  border-radius: 4px;
  line-height: 1.5;
}

.theme-audience {
  font-size: 13px;
  color: #5c6470;
  margin-bottom: 14px;
}

.theme-link a {
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
}

.themes-related {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 28px;
}

.themes-related h2 {
  font-size: 20px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 12px;
}

.themes-related > p {
  font-size: 14px;
  color: #5c6470;
  margin-bottom: 20px;
}

.themes-related .related-links {
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.themes-related .related-links li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.themes-related .related-links a {
  font-size: 14px;
  font-weight: 600;
  color: #0f766e;
}

.themes-related .related-links span {
  font-size: 13px;
  color: #7a848e;
}

/* --- 篇目清单页 --- */

.filter-section {
  margin-bottom: 36px;
}

.section-title {
  font-size: 20px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 16px;
}

.filter-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-tag {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 600;
  color: #5c6470;
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 20px;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.filter-tag:hover {
  border-color: #0f766e;
  color: #0f766e;
}

.filter-tag.is-active {
  background-color: #0f766e;
  border-color: #0f766e;
  color: #ffffff;
}

.catalog-section {
  margin-bottom: 48px;
}

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

.catalog-card {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.catalog-card:hover {
  box-shadow: 0 6px 18px rgba(45, 49, 54, 0.1);
  transform: translateY(-4px);
}

.catalog-figure {
  margin: 0;
}

.catalog-figure img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

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

.catalog-title {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.catalog-tags {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.catalog-desc {
  font-size: 13px;
  color: #5c6470;
  line-height: 1.6;
  margin-bottom: 14px;
  flex: 1;
}

.catalog-meta {
  font-size: 12px;
  color: #7a848e;
  margin-bottom: 12px;
}

.catalog-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
  margin-top: auto;
}

/* --- 专题解读页 --- */

.feature-section {
  margin-bottom: 56px;
}

.feature-editorial {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 32px;
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 32px;
  align-items: center;
}

.feature-media {
  margin: 0;
}

.feature-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: 8px;
}

.feature-editorial-body {
  min-width: 0;
}

.feature-kicker {
  font-size: 13px;
  font-weight: 700;
  color: #0f766e;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.feature-editorial-body h2 {
  font-size: 24px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 14px;
}

.feature-editorial-body p {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.7;
  margin-bottom: 14px;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 22px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.section-heading p {
  font-size: 14px;
  color: #5c6470;
  max-width: 720px;
}

.sequence-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.sequence-item {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 24px;
  display: flex;
  gap: 16px;
}

.sequence-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: #ecf3f4;
  color: #0f766e;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}

.sequence-content h3 {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 8px;
}

.sequence-content p {
  font-size: 13px;
  color: #5c6470;
  line-height: 1.6;
  margin-bottom: 12px;
}

.related-themes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  display: block;
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 20px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-card:hover {
  border-color: #0f766e;
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.08);
}

.related-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: #0f766e;
  margin-bottom: 8px;
}

.related-card p {
  font-size: 13px;
  color: #5c6470;
  line-height: 1.6;
}

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

.feature-card {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.feature-card:hover {
  box-shadow: 0 6px 18px rgba(45, 49, 54, 0.1);
  transform: translateY(-4px);
}

.feature-card-media {
  margin: 0;
}

.feature-card-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.feature-card-body {
  padding: 20px;
}

.feature-card-tag {
  margin-bottom: 10px;
}

.feature-card-body h3 {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.feature-card-body p {
  font-size: 13px;
  color: #5c6470;
  line-height: 1.6;
  margin-bottom: 14px;
}

.feature-help {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 32px;
}

.help-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.help-inner p {
  font-size: 15px;
  color: #2d3136;
  font-weight: 600;
  max-width: 560px;
}

.help-inner .text-link {
  margin-left: 16px;
}

/* --- 阅读指南页 --- */

.guide-section {
  margin-bottom: 48px;
}

.section-intro {
  font-size: 14px;
  color: #5c6470;
  max-width: 760px;
  margin-bottom: 24px;
}

.path-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.path-step {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 24px;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: #0f766e;
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
}

.step-title {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 8px;
}

.step-text {
  font-size: 13px;
  color: #5c6470;
  line-height: 1.6;
}

.column-table-wrap {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  overflow: hidden;
}

.column-table {
  font-size: 13px;
}

.column-table caption {
  text-align: left;
  padding: 16px 20px;
  font-weight: 700;
  color: #2d3136;
  background-color: #fafbfc;
  border-bottom: 1px solid #d9e2e8;
}

.column-table thead th {
  background-color: #f0f4f6;
  color: #2d3136;
  font-weight: 700;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid #d9e2e8;
  font-size: 13px;
}

.column-table tbody th {
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  color: #2d3136;
  border-bottom: 1px solid #eef2f4;
  background-color: #fafbfc;
  white-space: nowrap;
}

.column-table tbody td {
  padding: 12px 16px;
  color: #5c6470;
  border-bottom: 1px solid #eef2f4;
  line-height: 1.6;
}

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

.rule-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.rule-item {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 24px;
}

.rule-title {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.rule-text {
  font-size: 13px;
  color: #5c6470;
  line-height: 1.6;
}

.notice-box {
  background-color: #fdf3e3;
  border: 1px solid #f0d5a8;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
}

.notice-title {
  font-size: 16px;
  font-weight: 700;
  color: #a16207;
  margin-bottom: 8px;
}

.notice-text {
  font-size: 14px;
  color: #7a5a2e;
  line-height: 1.7;
}

.rule-detail-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.rule-detail {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 24px;
}

.rule-detail-title {
  font-size: 15px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.rule-detail-text {
  font-size: 13px;
  color: #5c6470;
  line-height: 1.6;
}

.auxiliary-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.auxiliary-card {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 24px;
}

.auxiliary-card-title {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 10px;
}

.auxiliary-card-text {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.7;
}

.auxiliary-card-text a {
  font-weight: 700;
  color: #0f766e;
}

.guide-figure {
  margin: 40px 0 0;
}

.guide-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: 8px;
}

.guide-figure figcaption {
  font-size: 13px;
  color: #7a848e;
  padding-top: 10px;
  text-align: center;
}

/* --- 术语索引页 --- */

.glossary-cover {
  margin: 0 0 36px;
}

.glossary-cover img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
}

.glossary-cats {
  margin-bottom: 36px;
}

.cat-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.cat-tag {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 600;
  color: #5c6470;
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 20px;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.cat-tag:hover {
  border-color: #0f766e;
  color: #0f766e;
}

.cat-tag.is-active {
  background-color: #0f766e;
  border-color: #0f766e;
  color: #ffffff;
}

.glossary-list {
  margin-bottom: 48px;
}

.term-group-title {
  font-size: 18px;
  font-weight: 700;
  color: #2d3136;
  padding-bottom: 12px;
  border-bottom: 2px solid #0f766e;
  margin-bottom: 20px;
  margin-top: 36px;
}

.term-group-title:first-of-type {
  margin-top: 0;
}

.term-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 24px;
}

.term-item {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 20px;
}

.term-name {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 6px;
}

.term-pinyin {
  font-size: 12px;
  font-weight: 400;
  color: #7a848e;
  margin-left: 8px;
}

.term-def {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.6;
  margin-bottom: 8px;
}

.term-example {
  font-size: 13px;
  color: #7a848e;
  line-height: 1.6;
  border-left: 3px solid #d9e2e8;
  padding-left: 12px;
}

.glossary-related {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 28px;
}

.glossary-related .related-links {
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}

.glossary-related .related-links li a {
  font-size: 14px;
  font-weight: 600;
  color: #0f766e;
}

/* --- 常见误区页 --- */

.myth-section {
  margin-bottom: 48px;
}

.content-media {
  margin: 0 0 24px;
}

.content-media-inline {
  display: block;
}

.content-media-inline img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
}

.content-media-inline figcaption {
  font-size: 13px;
  color: #7a848e;
  padding-top: 10px;
  text-align: center;
}

.myth-list {
  display: grid;
  gap: 16px;
}

.myth-item {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  overflow: hidden;
}

.myth-question {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  transition: background-color 0.2s ease;
}

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

.myth-question:hover {
  background-color: #fafbfc;
}

.myth-label {
  background-color: #fdf3e3;
  color: #a16207;
  flex-shrink: 0;
}

.myth-answer {
  padding: 0 20px 20px;
  border-top: 1px solid #eef2f4;
  padding-top: 20px;
}

.myth-fact {
  margin-bottom: 16px;
}

.fact-label {
  background-color: #ecf3f4;
  color: #0f766e;
  margin-bottom: 8px;
}

.fact-label,
.suggest-label {
  display: inline-block;
  margin-bottom: 8px;
}

.myth-fact p,
.myth-suggest p {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.7;
}

.legal-notice {
  background-color: #fdf3e3;
  border: 1px solid #f0d5a8;
  border-radius: 8px;
  padding: 28px;
  margin-bottom: 48px;
}

.legal-notice .section-title {
  color: #a16207;
}

.legal-notice-content p {
  font-size: 14px;
  color: #7a5a2e;
  line-height: 1.7;
  margin-bottom: 12px;
}

.legal-notice-content p:last-child {
  margin-bottom: 0;
}

.related-link-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-link-card {
  display: block;
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 20px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-link-card:hover {
  border-color: #0f766e;
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.08);
}

.related-link-name {
  display: inline-block;
  margin-bottom: 8px;
}

.related-link-desc {
  display: block;
  font-size: 13px;
  color: #5c6470;
  line-height: 1.6;
}

/* --- 站内动态页 --- */

.update-filter {
  margin-bottom: 36px;
}

.update-timeline {
  position: relative;
  margin-bottom: 48px;
  padding-left: 32px;
}

.update-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: #d9e2e8;
}

.timeline-item {
  position: relative;
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 20px 24px;
  margin-bottom: 20px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 28px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #0f766e;
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 2px #0f766e;
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.timeline-period {
  font-size: 13px;
  font-weight: 600;
  color: #5c6470;
  font-variant-numeric: tabular-nums;
}

.timeline-content h3 {
  font-size: 16px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 8px;
}

.timeline-content p {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.6;
  margin-bottom: 12px;
}

.timeline-content a {
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
}

.update-note {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 28px;
}

.update-note h2 {
  font-size: 20px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 16px;
}

.update-note p {
  font-size: 14px;
  color: #5c6470;
  line-height: 1.7;
  margin-bottom: 12px;
}

.update-note a {
  font-size: 14px;
  font-weight: 700;
  color: #0f766e;
  margin-right: 16px;
}

/* --- 404 页 --- */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
}

.error-panel {
  background-color: #ffffff;
  border: 1px solid #d9e2e8;
  border-radius: 8px;
  padding: 48px;
  text-align: center;
  max-width: 560px;
  width: 100%;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: #0f766e;
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 24px;
  font-weight: 700;
  color: #2d3136;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 15px;
  color: #5c6470;
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-link {
  display: inline-block;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  background-color: #0f766e;
  border-radius: 8px;
  min-height: 44px;
  line-height: 1.5;
}

.error-link:hover {
  background-color: #0b5c56;
  color: #ffffff;
}

.error-suggest {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 24px;
}

.error-suggest a {
  font-size: 14px;
  color: #0f766e;
  padding: 8px 16px;
  border: 1px solid #d9e2e8;
  border-radius: 20px;
  background-color: #ffffff;
}

.error-suggest a:hover {
  border-color: #0f766e;
}

/* ==========================================================================
   pages
   ========================================================================== */

/* 篇目清单页：按题材筛选隐藏逻辑由 JS 控制，此处只提供基础样式 */

/* 专题解读页：三段式结构 */

/* 常见误区页：折叠使用原生 details/summary */

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

@media (max-width: 1024px) {
  .themes-grid {
    grid-template-columns: 1fr;
  }

  .theme-card {
    grid-template-columns: 160px 1fr;
  }

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

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

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

  .path-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .rule-list,
  .rule-detail-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .term-list {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .header-inner {
    height: 56px;
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: #ffffff;
    border-bottom: 1px solid #d9e2e8;
    box-shadow: 0 8px 16px rgba(45, 49, 54, 0.08);
    display: block;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px;
    gap: 2px;
  }

  .nav-list li a {
    padding: 12px 14px;
    font-size: 15px;
    border-radius: 6px;
  }

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

  .site-nav.is-open {
    max-height: 480px;
  }

  .home-main {
    padding: 0 16px;
  }

  .inner-main {
    padding: 0 16px 48px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 0;
  }

  .hero-copy h1 {
    font-size: 28px;
  }

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

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .helper-grid {
    grid-template-columns: 1fr;
  }

  .updates-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-header {
    padding: 20px 0 24px;
    margin-bottom: 28px;
  }

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

  .theme-card {
    grid-template-columns: 1fr;
  }

  .theme-card-media img {
    height: 180px;
  }

  .catalog-grid {
    grid-template-columns: 1fr;
  }

  .feature-editorial {
    grid-template-columns: 1fr;
    padding: 24px;
  }

  .feature-media img {
    height: 200px;
  }

  .sequence-list {
    grid-template-columns: 1fr;
  }

  .related-themes {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .path-steps {
    grid-template-columns: 1fr;
  }

  .rule-list,
  .rule-detail-list {
    grid-template-columns: 1fr;
  }

  .auxiliary-cards {
    grid-template-columns: 1fr;
  }

  .related-link-list {
    grid-template-columns: 1fr;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 36px 16px 28px;
  }

  .footer-bottom {
    padding: 16px;
  }

  .content-calendar {
    overflow-x: auto;
    display: block;
  }

  .content-calendar table {
    min-width: 640px;
  }

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

  .column-table {
    min-width: 560px;
  }

  .help-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .help-inner .text-link {
    margin-left: 0;
    margin-right: 16px;
  }

  .error-main {
    padding: 48px 16px;
  }

  .error-panel {
    padding: 32px 24px;
  }

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

@media (max-width: 480px) {
  body {
    font-size: 14px;
  }

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

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

  .btn {
    padding: 10px 18px;
    font-size: 14px;
    width: 100%;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-copy h1 {
    font-size: 24px;
  }

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

  .tools-section,
  .calendar-section,
  .featured-section,
  .helper-section,
  .updates-section {
    padding: 32px 0;
  }

  .tools-section h2,
  .calendar-section h2,
  .featured-section h2,
  .helper-section h2,
  .updates-section h2 {
    font-size: 20px;
  }

  .featured-card img {
    height: 160px;
  }

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

  .theme-card-body {
    padding: 16px;
  }

  .catalog-body {
    padding: 16px;
  }

  .feature-editorial {
    padding: 16px;
  }

  .feature-editorial-body h2 {
    font-size: 20px;
  }

  .sequence-item {
    padding: 16px;
  }

  .related-card {
    padding: 16px;
  }

  .feature-card-body {
    padding: 16px;
  }

  .path-step {
    padding: 16px;
  }

  .rule-item,
  .rule-detail {
    padding: 16px;
  }

  .auxiliary-card {
    padding: 16px;
  }

  .term-item {
    padding: 16px;
  }

  .myth-question {
    padding: 16px;
    font-size: 14px;
  }

  .myth-answer {
    padding: 0 16px 16px;
    padding-top: 16px;
  }

  .timeline-item {
    padding: 16px;
  }

  .update-timeline {
    padding-left: 24px;
  }

  .timeline-item::before {
    left: -22px;
  }

  .update-note {
    padding: 20px;
  }

  .error-panel {
    padding: 24px 16px;
  }
}