:root {
  --color-primary: #2F7D6E;
  --color-primary-dark: #245F54;
  --color-primary-soft: #E3EFEC;
  --color-sand: #F5EFE3;
  --color-sand-deep: #EDE4D3;
  --color-accent: #C4622D;
  --color-accent-soft: #F6E4D8;
  --color-ink: #22302E;
  --color-ink-soft: #47534F;
  --color-muted: #6B7A76;
  --color-line: #E4E0D6;
  --color-surface: #FFFFFF;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-soft: 0 1px 2px rgba(34, 48, 46, 0.06), 0 6px 18px rgba(34, 48, 46, 0.05);
  --container: 1120px;
  --gutter: 24px;
  --header-height: 68px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
}

/* ==========================================================================
   base —— 全站基础重置与排版
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-ink);
  background-color: var(--color-sand);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

p {
  margin: 0;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

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

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

figure {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
}

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

/* ==========================================================================
   layout —— 站点头部 / 导航 / 主容器 / 页脚骨架
   ========================================================================== */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-sand);
  color: var(--color-ink);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
  padding: 6px 0;
  white-space: nowrap;
}

.brand::before {
  content: "";
  width: 12px;
  height: 22px;
  border-radius: 3px;
  background-color: var(--color-primary);
  flex: none;
}

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

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li {
  display: block;
}

.nav-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: var(--radius-md);
  font-size: 15px;
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.nav-list a:hover {
  color: var(--color-primary-dark);
  background-color: var(--color-primary-soft);
}

.nav-list a.is-current {
  color: var(--color-primary-dark);
  font-weight: 700;
  background-color: var(--color-primary-soft);
}

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

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--color-ink);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.home-main,
.inner-main,
.error-main {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter) 64px;
}

.site-factbar {
  max-width: var(--container);
  margin: 0 auto;
  padding: 10px var(--gutter);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-line);
}

.site-footer {
  background-color: var(--color-ink);
  color: #D8DFDC;
  margin-top: auto;
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px var(--gutter) 24px;
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 32px;
}

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

.footer-name {
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.footer-slogan {
  font-size: 14px;
  line-height: 1.7;
  color: #A8B4B0;
}

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

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 12px;
}

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

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  font-size: 14px;
  color: #B7C2BE;
}

.footer-list a:hover {
  color: #FFFFFF;
}

.footer-copy {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gutter) 28px;
  font-size: 13px;
  color: #8D9A96;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

/* 内页统一骨架 */

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

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

.breadcrumb a {
  color: var(--color-primary);
  min-height: 28px;
  display: inline-flex;
  align-items: center;
}

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

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

.page-header {
  padding: 20px 0 28px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.page-description {
  max-width: 760px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-ink-soft);
}

/* 通用 section */

.section {
  margin-bottom: 48px;
}

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

.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
  position: relative;
  padding-left: 14px;
  margin-bottom: 10px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  border-radius: 2px;
  background-color: var(--color-primary);
}

.section-desc,
.section-intro,
.section-note {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-muted);
  max-width: 820px;
}

.section-more {
  margin-top: 18px;
  font-size: 15px;
}

.section-more a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  font-weight: 600;
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
}

.section-more a::after {
  content: "→";
  font-size: 14px;
}

.section-more a:hover {
  border-bottom-color: var(--color-primary);
}

.tip-bar {
  margin-top: 20px;
  padding: 12px 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
  background-color: var(--color-primary-soft);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.tip-bar a {
  font-weight: 600;
}

/* 相关入口条 */

.related-bar {
  margin: 40px 0 8px;
  padding: 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.related-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.related-list li {
  display: block;
}

.related-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-md);
}

.related-list a:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

/* ==========================================================================
   components —— 通用按钮 / 卡片 / 标签 / 步骤
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
}

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

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

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

.btn-ghost:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.tag {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 8px;
  font-size: 12px;
  line-height: 1;
  border-radius: var(--radius-sm);
  background-color: var(--color-sand-deep);
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.tag-topic {
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

.tag-status {
  background-color: var(--color-accent-soft);
  color: var(--color-accent);
}

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

/* 首屏 */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  grid-template-areas:
    "text figure"
    "quick quick";
  gap: 32px 40px;
  padding: 40px 0 8px;
}

.hero-text {
  grid-area: text;
  min-width: 0;
}

.hero-title {
  font-size: 36px;
  line-height: 1.3;
  color: var(--color-ink);
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-ink-soft);
  max-width: 520px;
  margin-bottom: 24px;
}

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

.hero-figure {
  grid-area: figure;
  min-width: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-sand-deep);
  border: 1px solid var(--color-line);
}

.hero-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.hero-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-muted);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

.topic-quick {
  grid-area: quick;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 20px;
  border-top: 1px dashed var(--color-line);
}

.topic-quick li {
  display: block;
}

.topic-chip {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 999px;
}

.topic-chip:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-primary-dark);
}

/* 章节导航说明条 */

.nav-strip {
  padding: 24px 26px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-lg);
}

.nav-strip-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
}

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

.nav-strip-item {
  min-width: 0;
  padding: 12px 14px;
  background-color: var(--color-sand);
  border-radius: var(--radius-md);
}

.nav-strip-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 4px;
}

.nav-strip-desc {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.nav-strip-more {
  margin-top: 14px;
  font-size: 14px;
}

.nav-strip-more a {
  font-weight: 600;
}

/* 题材频道对照表 */

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

.channel-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 220px) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 220px);
  align-items: start;
  gap: 16px;
  padding: 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.channel-row:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-soft);
}

.channel-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 32px;
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
}

.channel-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-ink);
  padding-top: 4px;
}

.channel-cover,
.channel-audience,
.channel-field {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
  min-width: 0;
}

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

/* 最近更新速览 */

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

.update-group {
  min-width: 0;
  padding: 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.update-group-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary-dark);
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

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

.update-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  min-width: 0;
}

.update-item:hover {
  background-color: var(--color-sand);
}

.update-thumb {
  width: 44px;
  height: 58px;
  flex: none;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: var(--color-sand-deep);
}

.update-name {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.update-topic {
  flex: none;
  font-size: 13px;
  color: var(--color-muted);
}

.update-status {
  flex: none;
  font-size: 13px;
  color: var(--color-primary-dark);
}

.update-progress {
  flex: none;
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 600;
}

/* 人气榜单与专题合辑双栏 */

.duo-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 24px;
  margin-top: 20px;
}

.duo-col {
  min-width: 0;
  padding: 22px 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.col-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-ink);
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--color-line);
}

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

.rank-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 8px;
  border-radius: var(--radius-md);
  min-width: 0;
}

.rank-item:hover {
  background-color: var(--color-sand);
}

.rank-no {
  flex: none;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--color-accent);
  border-radius: var(--radius-sm);
}

.rank-item:nth-child(n + 4) .rank-no {
  background-color: var(--color-muted);
}

.rank-name {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rank-topic {
  flex: none;
  font-size: 13px;
  color: var(--color-muted);
}

.rank-status {
  flex: none;
  font-size: 13px;
  color: var(--color-primary-dark);
}

.collection-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.collection-item {
  display: flex;
  gap: 14px;
  padding: 12px;
  background-color: var(--color-sand);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  min-width: 0;
}

.collection-item:hover {
  border-color: var(--color-primary);
  background-color: var(--color-surface);
}

.collection-thumb {
  width: 84px;
  height: 108px;
  flex: none;
  object-fit: cover;
  border-radius: var(--radius-md);
  background-color: var(--color-sand-deep);
}

.collection-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

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

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

/* 章节阅读四步说明（首页） */

.steps .step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.step-item {
  min-width: 0;
  padding: 20px 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
}

.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--color-primary);
  border-radius: 50%;
}

.step-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.step-action,
.step-result {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.step-result {
  margin-top: 6px;
  color: var(--color-muted);
}

/* 字段口径与收录边界摘要（首页） */

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

.boundary-col {
  min-width: 0;
  padding: 22px 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

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

.boundary-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  border-left: 2px solid var(--color-primary-soft);
}

.boundary-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.boundary-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

/* 站内栏目索引 */

.index-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.index-item {
  min-width: 0;
  padding: 18px 18px 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.index-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-soft);
}

.index-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.index-link:hover {
  color: var(--color-primary-dark);
}

.index-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ==========================================================================
   pages —— 题材频道页
   ========================================================================== */

.topic-table {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.topic-row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) 180px;
  gap: 20px;
  align-items: start;
  padding: 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.topic-row:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-soft);
}

.topic-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 36px;
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
}

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

.topic-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.topic-cover,
.topic-reader,
.topic-field {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
  margin-bottom: 4px;
}

.topic-field {
  color: var(--color-muted);
  margin-bottom: 0;
}

.topic-thumb {
  min-width: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-sand-deep);
  border: 1px solid var(--color-line);
}

.topic-thumb img {
  width: 100%;
  height: 120px;
  object-fit: cover;
}

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

.topic-step {
  min-width: 0;
  padding: 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
}

.topic-step .step-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.topic-step .step-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

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

.confusion-item {
  min-width: 0;
  padding: 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.confusion-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.confusion-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

/* ==========================================================================
   pages —— 最近更新页
   ========================================================================== */

.update-list-section .update-group {
  padding: 22px 24px;
  margin-bottom: 20px;
}

.update-list-section .group-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary-dark);
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--color-line);
}

.update-list-section .update-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) minmax(0, 160px);
  align-items: center;
  gap: 16px;
  padding: 12px 10px;
  border-bottom: 1px dashed var(--color-line);
  border-radius: 0;
}

.update-list-section .update-item:last-child {
  border-bottom: none;
}

.update-list-section .update-thumb {
  width: 56px;
  height: 74px;
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-sand-deep);
}

.update-list-section .update-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.update-list-section .update-info {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.update-list-section .update-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  white-space: normal;
  overflow: visible;
  text-overflow: clip;
}

.update-list-section .update-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.update-list-section .update-progress {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  text-align: right;
}

.field-read-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.field-read-row {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 20px;
  padding: 16px 22px;
  border-bottom: 1px solid var(--color-line);
}

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

.field-read-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.field-read-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

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

.tip-item {
  min-width: 0;
  padding: 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius-lg);
}

.tip-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.tip-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

/* ==========================================================================
   pages —— 阅读说明页
   ========================================================================== */

.entry-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.entry-card {
  min-width: 0;
  padding: 22px 22px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.entry-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.entry-figure {
  margin-top: auto;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-sand-deep);
  border: 1px solid var(--color-line);
}

.entry-figure img {
  width: 100%;
  height: 150px;
  object-fit: cover;
}

.entry-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-muted);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

.section-reading-steps .step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.section-reading-steps .step-item {
  min-width: 0;
  padding: 20px 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
}

.section-reading-steps .step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: var(--color-primary);
  border-radius: 50%;
}

.section-reading-steps .step-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.section-reading-steps .step-action,
.section-reading-steps .step-result {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.section-reading-steps .step-result {
  margin-top: 6px;
  color: var(--color-muted);
}

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

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 52px;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  flex: none;
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 400;
  color: var(--color-primary-dark);
  background-color: var(--color-primary-soft);
  border-radius: 50%;
}

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

.faq-question:hover {
  color: var(--color-primary-dark);
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--color-ink-soft);
  border-top: 1px solid var(--color-line);
  padding-top: 14px;
}

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

.note-item {
  padding: 16px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-ink-soft);
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

/* ==========================================================================
   pages —— 字段与边界页
   ========================================================================== */

.field-figure {
  margin-bottom: 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-sand-deep);
  border: 1px solid var(--color-line);
}

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

.field-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-muted);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

.field-table {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.field-row {
  display: grid;
  grid-template-columns: minmax(0, 140px) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  padding: 16px 22px;
  border-bottom: 1px solid var(--color-line);
}

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

.field-row-head {
  background-color: var(--color-primary-soft);
}

.field-row-head .field-cell {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.field-cell {
  min-width: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.field-name {
  font-weight: 700;
  color: var(--color-ink);
}

.field-misread {
  color: var(--color-muted);
}

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

.scope-col {
  min-width: 0;
  padding: 22px 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.scope-col-title {
  font-size: 17px;
  font-weight: 700;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--color-line);
}

.scope-in .scope-col-title {
  color: var(--color-primary-dark);
}

.scope-out .scope-col-title {
  color: var(--color-accent);
}

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

.scope-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: var(--color-primary);
}

.scope-out .scope-list li::before {
  background-color: var(--color-accent);
}

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

.feedback-item {
  min-width: 0;
  padding: 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-lg);
}

.feedback-item-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.feedback-item-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

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

.error-main {
  display: flex;
  flex-direction: column;
  gap: 32px;
  padding-top: 48px;
}

.error-panel {
  padding: 36px 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.error-code {
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.error-panel h1 {
  font-size: 26px;
  margin-bottom: 14px;
}

.error-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-ink-soft);
  max-width: 640px;
  margin-bottom: 8px;
}

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

.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary-dark);
  background-color: var(--color-sand);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.error-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
}

.error-btn-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
}

.error-btn-primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #FFFFFF;
}

.error-hint {
  padding: 26px 28px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.error-hint h2 {
  font-size: 18px;
  margin-bottom: 14px;
}

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

.error-hint-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-dark);
  background-color: var(--color-primary-soft);
  border-radius: var(--radius-md);
}

.error-hint-list a:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

/* ==========================================================================
   responsive —— 1024px 与 768px 断点
   ========================================================================== */

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

  .hero-figure img {
    height: 280px;
  }

  .channel-row {
    grid-template-columns: 56px minmax(0, 200px) minmax(0, 1fr);
    grid-template-areas:
      "no name name"
      ". cover audience"
      ". field field";
    row-gap: 8px;
  }

  .channel-no {
    grid-area: no;
  }

  .channel-name {
    grid-area: name;
  }

  .channel-cover {
    grid-area: cover;
  }

  .channel-audience {
    grid-area: audience;
  }

  .channel-field {
    grid-area: field;
  }

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

  .topic-row {
    grid-template-columns: 64px minmax(0, 1fr);
    grid-template-areas:
      "index body"
      "thumb thumb";
  }

  .topic-index {
    grid-area: index;
  }

  .topic-body {
    grid-area: body;
  }

  .topic-thumb {
    grid-area: thumb;
  }

  .topic-thumb img {
    height: 180px;
  }

  .field-row {
    grid-template-columns: minmax(0, 120px) minmax(0, 1fr) minmax(0, 1fr);
  }

  .field-misread {
    grid-column: 2 / -1;
  }

  .field-row-head .field-misread {
    grid-column: auto;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 16px;
    --header-height: 60px;
  }

  body {
    font-size: 15px;
  }

  .header-inner {
    gap: 12px;
  }

  .brand {
    font-size: 18px;
  }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
    box-shadow: var(--shadow-soft);
    padding: 0 var(--gutter);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.22s ease;
  }

  .nav-list.is-open {
    max-height: 420px;
    padding: 8px 0 14px;
  }

  .nav-list a {
    min-height: 48px;
    padding: 0 12px;
    border-radius: var(--radius-md);
    font-size: 16px;
  }

  .site-main {
    padding-bottom: 40px;
  }

  .home-main,
  .inner-main,
  .error-main {
    padding-bottom: 40px;
  }

  .site-factbar {
    font-size: 12px;
  }

  .page-header {
    padding: 16px 0 20px;
    margin-bottom: 28px;
  }

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

  .hero {
    padding-top: 24px;
  }

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

  .hero-desc {
    font-size: 15px;
    margin-bottom: 18px;
  }

  .hero-figure img {
    height: 200px;
  }

  .hero-actions {
    gap: 10px;
  }

  .btn {
    flex: 1 1 auto;
  }

  .section {
    margin-bottom: 36px;
  }

  .section-title {
    font-size: 19px;
  }

  .nav-strip {
    padding: 20px 18px;
  }

  .nav-strip-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .channel-row {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "no"
      "name"
      "cover"
      "audience"
      "field";
    gap: 8px;
    padding: 16px;
  }

  .channel-no {
    width: 40px;
    height: 28px;
  }

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

  .update-item {
    flex-wrap: wrap;
    gap: 8px 10px;
  }

  .update-name {
    flex: 1 1 100%;
    white-space: normal;
  }

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

  .duo-col {
    padding: 18px 16px;
  }

  .rank-item {
    flex-wrap: wrap;
    gap: 6px 10px;
  }

  .rank-name {
    flex: 1 1 100%;
    white-space: normal;
  }

  .collection-item {
    flex-direction: row;
  }

  .steps .step-list,
  .section-reading-steps .step-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

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

  .index-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .topic-row {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "index"
      "body"
      "thumb";
    gap: 12px;
    padding: 16px;
  }

  .topic-thumb img {
    height: 160px;
  }

  .topic-steps,
  .confusion-list,
  .tips-list,
  .entry-columns,
  .feedback-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

  .update-list-section .update-item {
    grid-template-columns: 56px minmax(0, 1fr);
    grid-template-areas:
      "thumb info"
      "progress progress";
    row-gap: 8px;
    padding: 12px 6px;
  }

  .update-list-section .update-thumb {
    grid-area: thumb;
  }

  .update-list-section .update-info {
    grid-area: info;
  }

  .update-list-section .update-progress {
    grid-area: progress;
    text-align: left;
  }

  .field-read-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
    padding: 14px 16px;
  }

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

  .field-table {
    border: none;
    background-color: transparent;
    border-radius: 0;
    overflow: visible;
    gap: 12px;
  }

  .field-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
    padding: 16px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
  }

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

  .field-name {
    font-size: 16px;
    color: var(--color-primary-dark);
  }

  .field-cell::before {
    content: attr(data-label);
  }

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

  .related-bar {
    padding: 16px;
  }

  .related-list a {
    flex: 1 1 auto;
    justify-content: center;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px var(--gutter) 20px;
  }

  .footer-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px 20px;
  }

  .footer-list a {
    min-height: 44px;
  }

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

  .error-code {
    font-size: 40px;
  }

  .error-panel h1 {
    font-size: 22px;
  }

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

@media (max-width: 400px) {
  .index-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-figure img {
    height: 170px;
  }
}

/* 尊重系统减弱动效偏好 */

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

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