/* ==========================================================================
   喵趣漫画 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base：变量、重置、排版基准
   -------------------------------------------------------------------------- */
:root {
  --color-primary: #1f3a68;
  --color-primary-soft: #2c4f85;
  --color-muted: #5b6b82;
  --color-bg: #f5f6f8;
  --color-card: #ffffff;
  --color-accent: #a8792b;
  --color-line: #d8dde5;
  --color-line-soft: #e6eaf0;
  --color-text: #23303f;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-card: 0 1px 2px rgba(31, 58, 104, 0.06);
  --container: 1120px;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

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

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

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-primary);
}

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

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

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

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

button {
  font: inherit;
  color: inherit;
}

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

/* --------------------------------------------------------------------------
   layout：全站骨架（顶部信息条、页头、导航、主容器、页脚）
   -------------------------------------------------------------------------- */
.top-notice {
  background-color: #e9edf3;
  border-bottom: 1px solid var(--color-line);
}

.top-notice p {
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px 20px;
  font-size: 13px;
  color: var(--color-muted);
}

.site-header {
  background-color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  min-height: 64px;
}

.brand {
  font-size: 20px;
  font-weight: 600;
  color: #ffffff;
  letter-spacing: 0;
  padding: 8px 0;
}

.brand:hover,
.brand:focus-visible {
  color: #ffffff;
  text-decoration: none;
  opacity: 0.86;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: #ffffff;
}

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

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

.nav-link {
  display: block;
  padding: 10px 14px;
  font-size: 15px;
  color: #e3e9f2;
  border-radius: var(--radius-sm);
  min-height: 44px;
  line-height: 24px;
}

.nav-link:hover,
.nav-link:focus-visible {
  background-color: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  text-decoration: none;
}

.nav-link.is-current {
  background-color: rgba(168, 121, 43, 0.9);
  color: #ffffff;
}

.site-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 28px 20px 48px;
}

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 16px;
}

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

.breadcrumb-sep {
  color: #9aa7b8;
}

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

/* 内页页面标题区 */
.page-header {
  padding-bottom: 18px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--color-line);
}

.page-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.page-description {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 900px;
}

.page-lead {
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-muted);
}

.page-lead a {
  margin-right: 14px;
}

/* 通用 section */
.section {
  margin-bottom: 36px;
}

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

.section-title {
  font-size: 21px;
  font-weight: 600;
  color: var(--color-primary);
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
  line-height: 1.3;
}

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

.section-desc a {
  margin-right: 12px;
}

.section-note {
  margin: 8px 0 16px;
  font-size: 14px;
  color: var(--color-muted);
}

.section-intro {
  margin: 8px 0 16px;
  font-size: 14px;
  color: var(--color-muted);
}

/* 页脚 */
.site-footer {
  background-color: #1a2c4d;
  color: #c8d3e3;
  margin-top: 24px;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 32px 20px 20px;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 2fr;
  gap: 28px 40px;
}

.footer-brand {
  font-size: 18px;
  font-weight: 600;
  color: #ffffff;
}

.footer-slogan {
  margin-top: 6px;
  font-size: 13px;
  color: #9fb0c8;
}

.footer-back {
  margin-top: 10px;
  font-size: 13px;
}

.footer-back a {
  color: #d6c08a;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.footer-group-title {
  font-size: 14px;
  color: #ffffff;
  margin-bottom: 8px;
}

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

.footer-group a {
  font-size: 13px;
  color: #b7c5d9;
}

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

.footer-copy {
  grid-column: 1 / -1;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 12px;
  color: #8d9db5;
}

/* --------------------------------------------------------------------------
   components：卡片、表格、列表、图组等通用部件
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--color-primary-soft);
  color: #ffffff;
  text-decoration: none;
}

.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, 104, 0.08);
  color: var(--color-primary);
  text-decoration: none;
}

/* 封面墙 */
.cover-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.cover-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.cover-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 3px 10px rgba(31, 58, 104, 0.1);
}

.cover-figure {
  margin: 0 0 10px;
}

.cover-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: #eef1f5;
}

.cover-name {
  font-size: 15px;
  color: var(--color-primary);
}

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

.cover-tag a {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 12px;
  color: var(--color-primary-soft);
}

.cover-tag a:hover,
.cover-tag a:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* 表格：字段表 / 数据表 */
.field-table,
.data-table {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  font-size: 14px;
}

.field-table caption,
.data-table caption,
.table-caption,
.field-table-caption {
  padding: 10px 14px;
  text-align: left;
  font-size: 13px;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-line-soft);
}

.field-table th,
.field-table td,
.data-table th,
.data-table td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-line-soft);
}

.field-table thead th,
.data-table thead th {
  background-color: #eef1f6;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.field-table tbody th,
.data-table tbody th {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

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

/* 更新条目（首页摘要） */
.update-months {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.month-title,
.update-month-title {
  font-size: 15px;
  color: var(--color-primary);
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--color-line-soft);
}

.update-items,
.update-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.update-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
}

.update-name {
  font-weight: 600;
  color: var(--color-text);
}

.update-topic {
  font-size: 12px;
  color: var(--color-primary-soft);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  padding: 1px 8px;
}

.update-entry {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
}

/* 榜单条目（首页速览） */
.ranking-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.ranking-name {
  font-size: 16px;
  color: var(--color-primary);
  padding-left: 10px;
  border-left: 3px solid var(--color-accent);
}

.ranking-basis {
  margin: 8px 0 12px;
  font-size: 13px;
  color: var(--color-muted);
}

.ranking-items {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.ranking-items li {
  font-size: 14px;
  padding-left: 22px;
  position: relative;
}

.ranking-items li::before {
  content: counter(list-item);
  position: absolute;
  left: 0;
  top: 0;
  width: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
}

/* 站内页面索引（首页四列入口） */
.index-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

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

.index-name {
  font-size: 16px;
}

.index-desc {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-muted);
}

/* 图片容器 */
.section-media,
.guide-figure,
.rank-coverage-figure {
  margin: 0 0 18px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 10px;
}

.section-media img,
.guide-figure img,
.rank-coverage-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: #eef1f5;
}

.section-media figcaption,
.guide-figure figcaption,
.rank-coverage-caption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-muted);
}

/* --------------------------------------------------------------------------
   pages：各页专属模块
   -------------------------------------------------------------------------- */

/* 首页 · 首屏目录区 */
.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 460px);
  gap: 32px;
  align-items: center;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 36px;
}

.hero-kicker {
  display: inline-block;
  font-size: 13px;
  color: var(--color-accent);
  border: 1px solid rgba(168, 121, 43, 0.4);
  border-radius: 999px;
  padding: 2px 12px;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 30px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.hero-desc {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 620px;
}

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

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--color-line-soft);
}

.hero-fact dt {
  font-size: 12px;
  color: var(--color-muted);
}

.hero-fact dd {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.hero-media {
  margin: 0;
}

.hero-media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  background-color: #eef1f5;
}

.hero-media figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-muted);
}

/* 首页 · 题材分类方向总览 */
.topic-list {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-card);
  overflow: hidden;
}

.topic-row {
  display: grid;
  grid-template-columns: 160px minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 16px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-line-soft);
  font-size: 14px;
}

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

.topic-name {
  font-weight: 600;
  color: var(--color-primary);
}

.topic-trait {
  color: var(--color-text);
}

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

/* 首页 · 阅读说明与收录边界摘要 */
.guide-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

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

.guide-subtitle {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 12px;
}

/* 题材分类页 */
.topics-table-section .data-table {
  margin-top: 4px;
}

.topics-cover-grid {
  margin-top: 18px;
}

.cover-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.topics-detail-section .topic-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

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

.topic-note-title {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

.topic-note-hint {
  margin-top: 8px;
  font-size: 13px;
  color: var(--color-muted);
}

.topics-index-section .index-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.index-group-title {
  font-size: 15px;
  color: var(--color-primary);
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--color-line-soft);
}

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

.index-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  font-size: 14px;
}

.index-item .index-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.index-state {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
}

.topics-scope-section .scope-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.scope-column-title {
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

/* 最近更新页 */
.updates-section .update-month {
  margin-bottom: 18px;
  padding: 16px;
}

.updates-section .update-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

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

.update-thumb {
  margin: 0;
}

.update-thumb img {
  display: block;
  width: 96px;
  height: 128px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: #eef1f5;
}

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

.update-body .update-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.update-meta {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-primary-soft);
}

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

.updates-fields-section .field-table {
  margin-top: 4px;
}

.updates-howto-section .howto-list {
  counter-reset: howto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.howto-item {
  counter-increment: howto;
  position: relative;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px 16px 16px 52px;
}

.howto-item::before {
  content: counter(howto);
  position: absolute;
  left: 16px;
  top: 16px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 13px;
  text-align: center;
  line-height: 24px;
}

.howto-title {
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 6px;
}

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

.updates-related-section {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 20px;
}

.related-item a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  min-height: 44px;
  line-height: 26px;
}

.related-item a:hover,
.related-item a:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* 榜单排行页 */
.rank-list-section .rank-board-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.rank-board {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.rank-board-title {
  font-size: 16px;
  color: var(--color-primary);
  padding-left: 10px;
  border-left: 3px solid var(--color-accent);
}

.rank-board-basis {
  margin: 8px 0 12px;
  font-size: 13px;
  color: var(--color-muted);
}

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

.rank-board-item {
  display: grid;
  grid-template-columns: 22px 64px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.rank-item-index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1.6;
}

.rank-item-cover {
  margin: 0;
}

.rank-item-cover img {
  display: block;
  width: 64px;
  height: 86px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: #eef1f5;
}

.rank-item-body {
  min-width: 0;
}

.rank-item-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
}

.rank-item-tag {
  margin-top: 2px;
  font-size: 12px;
  color: var(--color-primary-soft);
}

.rank-item-reason {
  margin-top: 4px;
  font-size: 13px;
  color: var(--color-muted);
}

.rank-basis-section .rank-basis-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.rank-basis-name {
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

.rank-coverage-section .rank-coverage-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.rank-coverage-name {
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 8px;
}

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

.rank-next-section .rank-next-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.rank-next-item a {
  display: block;
  padding: 12px 14px;
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  min-height: 44px;
  line-height: 20px;
}

.rank-next-item a:hover,
.rank-next-item a:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* 阅读说明页 */
.guide-section {
  margin-bottom: 36px;
}

.guide-section .field-table {
  margin-top: 4px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 4px;
}

.boundary-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.boundary-title {
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 6px;
}

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

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

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 0 16px;
}

.faq-item summary {
  cursor: pointer;
  padding: 14px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  list-style: none;
  min-height: 44px;
}

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

.faq-item summary::after {
  content: "＋";
  float: right;
  font-family: var(--font-mono);
  color: var(--color-accent);
}

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

.faq-item p {
  padding: 0 0 14px;
  font-size: 14px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line-soft);
  padding-top: 12px;
}

.feedback-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feedback-step {
  background-color: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px;
}

.feedback-title {
  font-size: 15px;
  color: var(--color-primary);
  margin-bottom: 6px;
}

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

.feedback-note {
  margin-top: 14px;
  padding: 12px 16px;
  background-color: #eef1f6;
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--color-muted);
}

/* 404 */
.error-main {
  padding-top: 48px;
  padding-bottom: 64px;
}

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

.error-code {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1.2;
}

.error-title {
  font-size: 24px;
  color: var(--color-primary);
  margin: 8px 0 12px;
}

.error-text {
  font-size: 15px;
  color: var(--color-muted);
}

.error-home-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 20px;
  padding: 10px 20px;
  background-color: var(--color-primary);
  color: #ffffff;
  border-radius: var(--radius-sm);
}

.error-home-link:hover,
.error-home-link:focus-visible {
  background-color: var(--color-primary-soft);
  color: #ffffff;
  text-decoration: none;
}

.error-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line-soft);
}

.error-links a {
  display: block;
  padding: 8px 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: 14px;
  min-height: 44px;
  line-height: 26px;
}

.error-links a:hover,
.error-links a:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   responsive：平板与手机
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .hero-section {
    grid-template-columns: minmax(0, 1fr);
    padding: 22px;
  }

  .hero-media {
    order: -1;
  }

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

  .cover-grid,
  .update-months,
  .ranking-board,
  .index-grid,
  .topics-index-section .index-groups,
  .topics-scope-section .scope-columns,
  .updates-howto-section .howto-list,
  .rank-list-section .rank-board-grid,
  .rank-basis-section .rank-basis-list,
  .rank-coverage-section .rank-coverage-list,
  .feedback-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .brand {
    font-size: 18px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    padding-bottom: 12px;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

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

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

  .site-main {
    padding: 20px 16px 36px;
  }

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

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

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

  .hero-section {
    padding: 20px 16px;
  }

  .hero-facts {
    gap: 18px;
  }

  .cover-grid,
  .update-months,
  .ranking-board,
  .index-grid,
  .guide-columns,
  .topics-detail-section .topic-notes,
  .topics-index-section .index-groups,
  .topics-scope-section .scope-columns,
  .updates-howto-section .howto-list,
  .rank-list-section .rank-board-grid,
  .rank-basis-section .rank-basis-list,
  .rank-coverage-section .rank-coverage-list,
  .rank-next-section .rank-next-list,
  .related-list,
  .boundary-list,
  .feedback-steps,
  .error-links {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .updates-section .update-item {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 12px;
  }

  .update-thumb img {
    width: 76px;
    height: 101px;
  }

  .rank-board-item {
    grid-template-columns: 20px 56px minmax(0, 1fr);
    gap: 8px;
  }

  .rank-item-cover img {
    width: 56px;
    height: 75px;
  }

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

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

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

  .error-code {
    font-size: 32px;
  }
}

@media (max-width: 420px) {
  .hero-actions .btn {
    flex: 1 1 100%;
  }

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

/* 动效增强：仅在支持时启用，不影响初始可见性 */
@media (prefers-reduced-motion: no-preference) {
  .cover-card,
  .index-card,
  .ranking-card,
  .rank-board,
  .topic-note,
  .howto-item,
  .feedback-step {
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  }

  .index-card:hover,
  .ranking-card:hover,
  .rank-board:hover,
  .topic-note:hover,
  .howto-item:hover,
  .feedback-step:hover {
    border-color: var(--color-accent);
    box-shadow: 0 3px 10px rgba(31, 58, 104, 0.1);
  }
}