/* ==========================================================================
   海角禁区 · 整站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base
   -------------------------------------------------------------------------- */

:root {
  --color-bamboo: #2F7A63;
  --color-bamboo-dark: #235B4A;
  --color-ink: #16303C;
  --color-ink-soft: #2B444E;
  --color-orange: #E0813F;
  --color-mist: #EEF4F1;
  --color-paper: #FBFAF7;
  --color-gray-blue: #4A5A60;
  --color-line: #D7E2DD;

  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
  --font-mono: "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;

  --radius-card: 8px;
  --radius-tag: 6px;
  --radius-pill: 4px;

  --container: 1160px;
  --container-narrow: 760px;

  --shadow-card: 0 1px 2px rgba(22, 48, 60, 0.05);
  --shadow-raise: 0 6px 16px rgba(22, 48, 60, 0.1);

  --header-height: 68px;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-ink-soft);
  background-color: var(--color-mist);
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  color: var(--color-ink);
  font-weight: 600;
  line-height: 1.35;
}

a {
  color: var(--color-bamboo);
  text-decoration: none;
  transition: color 0.18s ease;
}

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

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

figure {
  margin: 0;
}

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

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

/* 等宽数字字段标签，用于年份、月份、章节区间 */
.tag-mono,
.year-strip-list,
.digest-year-list,
.year-list,
.record-fields,
.log-range,
.log-month,
.note-meta,
.note-range,
.cover-tags,
.shelf-meta,
.log-status,
.year-count {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */

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

.container.narrow {
  max-width: var(--container-narrow);
}

.site-main {
  display: block;
  padding-bottom: 72px;
}

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
  transition: box-shadow 0.2s ease;
}

.site-header.is-scrolled {
  box-shadow: 0 2px 10px rgba(22, 48, 60, 0.08);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  font-size: 21px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0;
}

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

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li {
  display: block;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  color: var(--color-ink-soft);
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--color-bamboo);
  background-color: var(--color-mist);
}

.nav-list a.is-current {
  color: #fff;
  background-color: var(--color-bamboo);
}

.nav-list a.is-current:hover,
.nav-list a.is-current:focus-visible {
  color: #fff;
  background-color: var(--color-bamboo-dark);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-tag);
  background-color: var(--color-paper);
}

.menu-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-ink);
  border-radius: 1px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 22px 24px 0;
  font-size: 13px;
  color: var(--color-gray-blue);
}

.breadcrumb a {
  color: var(--color-gray-blue);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-bamboo);
}

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

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

/* 内页标题区 */
.page-header {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px 0;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-ink);
  line-height: 1.4;
}

.page-header + .container,
.page-header + .page-head,
.page-header + .page-title,
.page-header + .page-title-block,
.page-header + .page-title-section {
  margin-top: 18px;
}

.inner-main .container {
  padding-top: 8px;
}

/* 内页侧栏布局：默认主内容在前，.sidebar-left 时侧栏在前 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 40px;
  align-items: start;
  padding-top: 28px;
}

.page-layout.sidebar-left,
.sidebar-left .page-layout {
  grid-template-columns: 260px minmax(0, 1fr);
}

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

/* 页脚 */
.site-footer {
  margin-top: 32px;
  padding-top: 48px;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(4, minmax(0, 1fr));
  gap: 32px;
  padding-bottom: 36px;
}

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

.footer-logo {
  font-size: 19px;
  font-weight: 700;
  color: var(--color-ink);
}

.footer-desc {
  margin-top: 10px;
  max-width: 300px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-gray-blue);
}

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

.footer-title {
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
}

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

.footer-col li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-gray-blue);
}

.footer-col a {
  color: var(--color-gray-blue);
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--color-bamboo);
}

.footer-bottom {
  padding-top: 18px;
  padding-bottom: 26px;
  border-top: 1px solid var(--color-line);
}

.copyright {
  font-size: 13px;
  color: var(--color-gray-blue);
}

/* --------------------------------------------------------------------------
   components · 通用组件
   -------------------------------------------------------------------------- */

/* 区块标题 */
.section-title {
  font-size: 21px;
  font-weight: 700;
  color: var(--color-ink);
}

.section-desc,
.section-intro,
.section-lead,
.faq-group-lead,
.faq-related-lead {
  margin-top: 10px;
  max-width: var(--container-narrow);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.section-title + .section-desc,
.section-title + .section-intro,
.section-title + .section-lead {
  margin-top: 10px;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border-radius: var(--radius-tag);
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  color: #fff;
  background-color: var(--color-bamboo);
  border-color: var(--color-bamboo);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  color: #fff;
  background-color: var(--color-bamboo-dark);
  border-color: var(--color-bamboo-dark);
}

.btn-ghost {
  color: var(--color-bamboo);
  background-color: var(--color-paper);
  border-color: var(--color-line);
}

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

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-bamboo);
}

.text-link::after {
  content: "→";
  font-size: 14px;
}

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

/* 卡片链接（铺满整卡） */
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-bamboo);
}

.card-link::after {
  content: "→";
  font-size: 13px;
}

.card-link:hover,
.card-link:focus-visible {
  color: var(--color-orange);
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-bamboo-dark);
  background-color: var(--color-mist);
  border: 1px solid var(--color-line);
}

.tag-status {
  color: var(--color-orange);
  background-color: #FDF2E8;
  border-color: #F3D9C4;
}

/* 折叠问答 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 22px;
}

.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  box-shadow: var(--shadow-card);
}

.faq-question {
  position: relative;
  display: block;
  padding: 16px 48px 16px 18px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 20px;
  width: 9px;
  height: 9px;
  margin-top: -6px;
  border-right: 2px solid var(--color-bamboo);
  border-bottom: 2px solid var(--color-bamboo);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question {
  color: var(--color-bamboo);
}

.faq-item[open] .faq-question::after {
  transform: rotate(-135deg);
  margin-top: -2px;
}

.faq-answer {
  padding: 0 18px 18px;
  border-top: 1px solid var(--color-line);
  margin-top: 2px;
}

.faq-answer p {
  padding-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

/* 记录行通用 */
.record-row,
.log-item {
  padding: 14px 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

/* 图片容器通用约束 */
.hero-visual,
.cover-thumb,
.block-figure,
.shelf-card-media,
.page-head-figure,
.log-divider,
.path-overview-figure,
.path-table-figure,
.note-media,
.page-hero-figure,
.boundary-figure {
  overflow: hidden;
  border-radius: var(--radius-card);
  background-color: var(--color-mist);
}

.hero-visual img,
.cover-thumb img,
.block-figure img,
.shelf-card-media img,
.page-head-figure img,
.log-divider img,
.path-overview-figure img,
.path-table-figure img,
.note-media img,
.page-hero-figure img,
.boundary-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

figcaption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-gray-blue);
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

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

/* 首屏 */
.hero {
  padding: 48px 0 56px;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 48px;
  align-items: start;
}

.hero-intro {
  min-width: 0;
  padding-top: 8px;
}

.hero-eyebrow {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--color-bamboo-dark);
  background-color: var(--color-mist);
  border: 1px solid var(--color-line);
}

.hero-intro h1 {
  margin-top: 16px;
  font-size: 34px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-ink);
}

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

.hero-sub {
  margin-top: 10px;
  max-width: 520px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.hero-visual {
  aspect-ratio: 16 / 9;
  border: 1px solid var(--color-line);
}

.cover-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.cover-card {
  display: flex;
  flex-direction: column;
  padding: 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  box-shadow: var(--shadow-card);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.cover-card:hover,
.cover-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--color-bamboo);
  box-shadow: var(--shadow-raise);
}

.cover-thumb {
  aspect-ratio: 4 / 5;
  border: 1px solid var(--color-line);
}

.cover-name {
  margin-top: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
}

.cover-tags {
  margin-top: 6px;
  font-size: 13px;
  color: var(--color-gray-blue);
}

.year-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  margin-top: 18px;
  padding: 12px 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-mist);
}

.year-strip-label {
  font-size: 13px;
  color: var(--color-gray-blue);
}

.year-strip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.year-strip-list li {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--color-ink-soft);
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
}

/* 主推三块 */
.feature-main {
  padding: 56px 0;
}

.feature-main .section-desc {
  margin-bottom: 28px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  align-items: start;
}

.feature-block {
  padding: 22px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  min-width: 0;
}

.block-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
}

.block-figure {
  aspect-ratio: 3 / 2;
  margin-top: 16px;
  border: 1px solid var(--color-line);
}

.block-text {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.feature-notes .block-text:first-of-type {
  margin-top: 16px;
}

.chapter-list {
  margin-top: 16px;
  border-top: 1px solid var(--color-line);
}

.chapter-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 15px;
  line-height: 1.7;
}

.chapter-no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-gray-blue);
}

.chapter-name {
  color: var(--color-ink-soft);
  overflow-wrap: anywhere;
}

.chapter-mark {
  font-size: 13px;
  color: var(--color-orange);
  white-space: nowrap;
}

/* 书库分区入口 */
.shelves-entry {
  padding: 56px 0;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.shelves-entry .section-desc {
  margin-bottom: 28px;
}

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

.shelf-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-mist);
  min-width: 0;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.shelf-card:hover,
.shelf-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--color-bamboo);
  box-shadow: var(--shadow-raise);
}

.shelf-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
}

.shelf-hint {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.shelf-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

/* 发行记年摘录 */
.release-digest {
  padding: 56px 0;
}

.release-digest .section-desc {
  margin-bottom: 28px;
}

.digest-grid {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.digest-years {
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

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

.digest-year {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--color-ink-soft);
  border: 1px solid var(--color-line);
  background-color: var(--color-mist);
}

.digest-year.is-active {
  color: #fff;
  background-color: var(--color-bamboo);
  border-color: var(--color-bamboo);
}

.digest-records {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.record-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.record-fields {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-gray-blue);
}

/* 分区关注刻度 */
.focus-scale {
  padding: 56px 0;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.focus-scale .section-desc {
  margin-bottom: 28px;
}

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

.focus-item {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-bamboo);
  border-radius: var(--radius-card);
  background-color: var(--color-mist);
  min-width: 0;
}

.focus-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.focus-text {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

/* 阅读路径三卡 */
.reading-paths {
  padding: 56px 0;
}

.reading-paths .section-desc {
  margin-bottom: 28px;
}

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

.path-card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  box-shadow: var(--shadow-card);
  min-width: 0;
}

.path-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
}

.path-audience,
.path-start,
.path-next {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.path-card .card-link {
  margin-top: auto;
  padding-top: 14px;
}

/* 编辑说明条 */
.editorial-strip {
  padding: 40px 0;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.editorial-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px 40px;
  align-items: center;
}

.editorial-points {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 28px;
  margin-top: 14px;
}

.editorial-point {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.editorial-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 首页折叠问答 */
.faq-fold {
  padding: 56px 0 64px;
}

/* --------------------------------------------------------------------------
   pages · 书库分区
   -------------------------------------------------------------------------- */

.page-title .page-lede,
.page-title-block .page-lead,
.page-title-section .page-lead {
  margin-top: 12px;
  max-width: var(--container-narrow);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

/* 侧栏 */
.shelf-index,
.year-index {
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

.aside-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.shelf-index-list,
.year-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 14px;
}

.shelf-index-list li,
.year-list li {
  min-width: 0;
}

.shelf-index-list a,
.year-list a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-ink-soft);
  border: 1px solid transparent;
}

.shelf-index-list a:hover,
.shelf-index-list a:focus-visible,
.year-list a:hover,
.year-list a:focus-visible {
  color: var(--color-bamboo);
  background-color: var(--color-mist);
  border-color: var(--color-line);
}

.shelf-index-list li.is-current a,
.year-list a.is-current {
  color: #fff;
  background-color: var(--color-bamboo);
  border-color: var(--color-bamboo);
}

.year-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.year-count {
  font-size: 13px;
  color: var(--color-gray-blue);
}

.aside-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-gray-blue);
}

/* 分区标签行 */
.shelf-tags {
  margin-bottom: 32px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tag-row li {
  display: inline-flex;
}

.tag-row a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--color-bamboo-dark);
  background-color: var(--color-mist);
  border: 1px solid var(--color-line);
}

.tag-row a:hover,
.tag-row a:focus-visible {
  color: #fff;
  background-color: var(--color-bamboo);
  border-color: var(--color-bamboo);
}

/* 分区卡列表 */
.shelf-cards .section-desc {
  margin-bottom: 24px;
}

.shelf-cards .shelf-card {
  flex-direction: row;
  align-items: flex-start;
  gap: 20px;
  padding: 22px;
  background-color: var(--color-paper);
  margin-bottom: 16px;
}

.shelf-card-body {
  flex: 1 1 auto;
  min-width: 0;
}

.shelf-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
}

.shelf-card-clue {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.shelf-card-fields {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.shelf-card-media {
  flex: 0 0 180px;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-line);
}

.shelf-card-wide .shelf-card-body {
  max-width: 100%;
}

/* 跨区阅读入口 */
.cross-shelf-entry {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-line);
}

.cross-shelf-entry .section-desc {
  margin-bottom: 20px;
}

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

.entry-item {
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
  min-width: 0;
}

/* --------------------------------------------------------------------------
   pages · 发行记年
   -------------------------------------------------------------------------- */

.page-head {
  margin-top: 18px;
}

.page-head .page-lead {
  max-width: var(--container-narrow);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.page-head-figure {
  margin-top: 20px;
  aspect-ratio: 21 / 9;
  border: 1px solid var(--color-line);
}

.page-head-figure figcaption {
  padding: 10px 14px;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
}

.page-head-figure img + figcaption {
  margin-top: 0;
}

.log-group {
  padding-bottom: 28px;
}

.group-title {
  padding-bottom: 10px;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-orange);
}

.month-title {
  margin-top: 22px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-bamboo-dark);
}

.log-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

.log-item {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) auto;
  gap: 8px 16px;
  align-items: center;
  font-size: 15px;
  line-height: 1.7;
}

.log-name {
  font-weight: 600;
  color: var(--color-ink);
  overflow-wrap: anywhere;
}

.log-shelf {
  font-size: 14px;
  color: var(--color-gray-blue);
}

.log-range,
.log-month {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-gray-blue);
}

.log-status {
  justify-self: end;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  white-space: nowrap;
  border: 1px solid var(--color-line);
  background-color: var(--color-mist);
  color: var(--color-gray-blue);
}

.log-status.status-ongoing {
  color: var(--color-bamboo-dark);
  background-color: #E4F0EA;
  border-color: #C4DDD2;
}

.log-status.status-marked {
  color: #A85A1E;
  background-color: #FDF2E8;
  border-color: #F3D9C4;
}

.log-status.status-pending {
  color: var(--color-gray-blue);
  background-color: var(--color-mist);
  border-color: var(--color-line);
}

.log-divider {
  margin: 8px 0 28px;
  aspect-ratio: 21 / 9;
  border: 1px solid var(--color-line);
}

.log-divider figcaption {
  padding: 10px 14px;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
}

.status-legend {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--color-line);
}

.status-legend .section-lead {
  margin-bottom: 20px;
}

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

.legend-item {
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  min-width: 0;
}

.legend-term {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.legend-desc {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.legend-note {
  margin-top: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

/* --------------------------------------------------------------------------
   pages · 阅读路径
   -------------------------------------------------------------------------- */

.path-overview {
  padding: 36px 0 8px;
}

.path-overview-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 36px;
  align-items: center;
}

.path-overview-figure {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-line);
}

.path-overview-figure figcaption {
  padding: 10px 14px;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
}

.path-overview-text {
  min-width: 0;
}

.path-overview-text h2 {
  font-size: 21px;
  font-weight: 700;
  color: var(--color-ink);
}

.path-overview-text p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.path-overview-points {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.path-overview-points li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.path-overview-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-orange);
}

.path-cards {
  padding: 44px 0;
}

.path-cards .section-intro {
  margin-bottom: 26px;
}

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

.path-cards .path-card {
  padding: 24px;
  background-color: var(--color-mist);
}

.path-card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
}

.path-card-fields {
  margin-top: 16px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 14px;
  font-size: 15px;
  line-height: 1.8;
}

.path-card-fields dt {
  color: var(--color-gray-blue);
  white-space: nowrap;
}

.path-card-fields dd {
  color: var(--color-ink-soft);
  min-width: 0;
}

.path-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-bamboo);
}

.path-card-link::after {
  content: "→";
  font-size: 13px;
}

.path-card-link:hover,
.path-card-link:focus-visible {
  color: var(--color-orange);
}

.path-steps {
  padding: 44px 0;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.path-steps .section-intro {
  margin-bottom: 24px;
}

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

.step-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-mist);
  min-width: 0;
}

.step-item .step-number {
  grid-row: span 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 14px;
  color: #fff;
  background-color: var(--color-bamboo);
}

.step-item .step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  align-self: center;
}

.step-item p {
  grid-column: 2;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.step-footnote {
  margin-top: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.step-footnote a {
  margin-right: 14px;
}

.path-table-section {
  padding: 44px 0;
}

.path-table-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 32px;
  align-items: start;
}

.path-table-main {
  min-width: 0;
}

.path-table-main .section-intro {
  margin-bottom: 20px;
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

.path-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 15px;
}

.path-table caption {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  color: var(--color-gray-blue);
  border-bottom: 1px solid var(--color-line);
}

.path-table th,
.path-table td {
  padding: 12px 16px;
  text-align: left;
  line-height: 1.7;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.path-table thead th {
  font-weight: 600;
  color: var(--color-ink);
  background-color: var(--color-mist);
}

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

.path-table tbody th {
  font-weight: 600;
  color: var(--color-bamboo-dark);
  white-space: nowrap;
}

.path-table-aside {
  min-width: 0;
}

.path-table-figure {
  aspect-ratio: 3 / 4;
  border: 1px solid var(--color-line);
}

.path-table-figure figcaption {
  padding: 10px 14px;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
}

.path-cautions {
  padding: 44px 0;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
}

.path-cautions .section-intro {
  margin-bottom: 24px;
}

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

.caution-item {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-orange);
  border-radius: var(--radius-card);
  background-color: var(--color-mist);
  min-width: 0;
}

.caution-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.caution-item p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.path-related {
  padding: 44px 0 8px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.related-links li {
  min-width: 0;
}

.related-links a {
  display: block;
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-ink-soft);
}

.related-links a:hover,
.related-links a:focus-visible {
  color: var(--color-bamboo);
  border-color: var(--color-bamboo);
}

/* --------------------------------------------------------------------------
   pages · 章节导读
   -------------------------------------------------------------------------- */

.note-fields {
  padding: 36px 0 8px;
}

.note-fields .section-intro {
  margin-bottom: 22px;
}

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

.field-card {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-mist);
  min-width: 0;
}

.field-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.field-card p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.note-list {
  padding: 40px 0 8px;
}

.note-list .section-intro {
  margin-bottom: 26px;
}

.note-item {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 26px;
  padding: 26px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: start;
}

.note-item:first-of-type {
  padding-top: 8px;
}

.note-media {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-line);
}

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

.note-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
}

.note-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
}

.note-meta {
  font-size: 13px;
  color: var(--color-gray-blue);
}

.note-fields-list {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px 16px;
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
}

.note-fields-list dt {
  color: var(--color-bamboo-dark);
  font-weight: 500;
  white-space: nowrap;
}

.note-fields-list dd {
  color: var(--color-gray-blue);
  min-width: 0;
}

.note-shelf,
.note-range {
  display: inline-block;
  margin-right: 10px;
  font-size: 13px;
  color: var(--color-gray-blue);
}

.log-coordination {
  padding: 40px 0 8px;
}

.log-coordination .section-intro {
  margin-bottom: 22px;
}

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

.coord-item {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  min-width: 0;
}

.coord-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.coord-item p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.note-related {
  padding: 44px 0 8px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.related-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  min-width: 0;
}

.related-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.related-card p {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.related-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding-top: 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-bamboo);
}

.related-link::after {
  content: "→";
  font-size: 13px;
}

.related-link:hover,
.related-link:focus-visible {
  color: var(--color-orange);
}

/* --------------------------------------------------------------------------
   pages · 编辑说明
   -------------------------------------------------------------------------- */

.page-hero-figure {
  margin-top: 24px;
  aspect-ratio: 21 / 9;
  border: 1px solid var(--color-line);
}

.page-hero-caption {
  padding: 10px 14px;
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
}

.editorial .section,
.scope-section,
.method-section,
.verify-section,
.boundary-section,
.feedback-section {
  padding: 36px 0 8px;
}

.body-text {
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-ink-soft);
}

.method-section .section-intro,
.verify-section .section-intro,
.boundary-section .section-intro {
  margin-bottom: 22px;
}

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

.method-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-mist);
  min-width: 0;
}

.method-step .step-number {
  grid-row: span 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-bamboo-dark);
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
}

.method-step .step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  align-self: center;
}

.step-text {
  grid-column: 2;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

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

.verify-item {
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  min-width: 0;
}

.verify-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.verify-text {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.boundary-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 36px;
  align-items: start;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
}

.boundary-text {
  min-width: 0;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 18px;
}

.boundary-item {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.boundary-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 2px;
  background-color: var(--color-orange);
}

.boundary-figure {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--color-line);
}

.boundary-caption {
  padding: 10px 14px;
  background-color: var(--color-mist);
  border-top: 1px solid var(--color-line);
}

.feedback-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.link-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  min-width: 0;
}

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

.link-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.link-card:hover .link-card-title,
.link-card:focus-visible .link-card-title {
  color: var(--color-bamboo);
}

.link-card-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-gray-blue);
}

/* --------------------------------------------------------------------------
   pages · 常见疑问
   -------------------------------------------------------------------------- */

.faq-group {
  padding: 32px 0 8px;
}

.faq-group h2 {
  font-size: 21px;
  font-weight: 700;
  color: var(--color-ink);
}

.faq-visual {
  margin-top: 20px;
  aspect-ratio: 21 / 9;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.faq-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.faq-related {
  padding: 36px 0 8px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.related-item {
  padding: 18px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background-color: var(--color-paper);
  min-width: 0;
}

.related-item a {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.related-item a:hover,
.related-item a:focus-visible {
  color: var(--color-bamboo);
}

.related-item p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-gray-blue);
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */

.error-main {
  padding: 72px 0 88px;
}

.error-inner {
  max-width: 720px;
  text-align: center;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 44px;
  font-weight: 700;
  color: var(--color-bamboo);
  line-height: 1.2;
}

.error-title {
  margin-top: 12px;
  font-size: 26px;
  font-weight: 700;
  color: var(--color-ink);
}

.error-desc {
  margin: 16px auto 0;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-gray-blue);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.error-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: var(--radius-tag);
  font-size: 15px;
  color: var(--color-bamboo);
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
}

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

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

.error-btn-primary:hover,
.error-btn-primary:focus-visible {
  color: #fff;
  background-color: var(--color-bamboo-dark);
  border-color: var(--color-bamboo-dark);
}

.error-note {
  margin-top: 26px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-gray-blue);
}

.error-note a {
  margin: 0 8px;
}

/* --------------------------------------------------------------------------
   responsive · 960px
   -------------------------------------------------------------------------- */

@media (max-width: 960px) {
  .container {
    padding: 0 20px;
  }

  .header-inner {
    padding: 0 20px;
  }

  .breadcrumb,
  .page-header {
    padding-left: 20px;
    padding-right: 20px;
  }

  .hero {
    padding: 36px 0 44px;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .hero-intro h1 {
    font-size: 30px;
  }

  .feature-main,
  .shelves-entry,
  .release-digest,
  .focus-scale,
  .reading-paths,
  .faq-fold {
    padding-top: 44px;
    padding-bottom: 44px;
  }

  .feature-grid,
  .shelf-grid,
  .path-grid,
  .focus-list,
  .entry-list,
  .legend-list,
  .field-grid,
  .coord-list,
  .related-grid,
  .related-links,
  .related-list,
  .verify-list,
  .feedback-links,
  .path-card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .digest-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .digest-year-list {
    flex-direction: row;
    flex-wrap: wrap;
  }

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

  /* 侧栏折叠到主内容之后 */
  .page-layout,
  .page-layout.sidebar-left,
  .sidebar-left .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .page-layout > aside,
  .page-layout > .content {
    grid-column: 1;
  }

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

  .page-layout > aside {
    order: 2;
  }

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

  .log-status {
    justify-self: start;
  }

  .path-overview-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .path-table-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .path-table-figure {
    aspect-ratio: 16 / 9;
  }

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

  .note-item {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 20px;
  }
}

/* --------------------------------------------------------------------------
   responsive · 640px
   -------------------------------------------------------------------------- */

@media (max-width: 640px) {
  body {
    font-size: 15px;
  }

  .container {
    padding: 0 16px;
  }

  .header-inner {
    padding: 0 16px;
    min-height: 60px;
  }

  .menu-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    padding: 0 16px 12px;
    background-color: var(--color-paper);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 8px 18px rgba(22, 48, 60, 0.1);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding-top: 8px;
  }

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

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

  .breadcrumb,
  .page-header {
    padding-left: 16px;
    padding-right: 16px;
  }

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

  .hero {
    padding: 28px 0 36px;
  }

  .hero-grid {
    gap: 26px;
  }

  .hero-intro h1 {
    font-size: 26px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
  }

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

  .year-strip {
    flex-wrap: nowrap;
    overflow-x: auto;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
  }

  .year-strip-label {
    flex: 0 0 auto;
  }

  .year-strip-list {
    flex: 0 0 auto;
    flex-wrap: nowrap;
  }

  .feature-main,
  .shelves-entry,
  .release-digest,
  .focus-scale,
  .reading-paths,
  .faq-fold {
    padding-top: 36px;
    padding-bottom: 36px;
  }

  .feature-grid,
  .shelf-grid,
  .path-grid,
  .focus-list,
  .entry-list,
  .legend-list,
  .field-grid,
  .coord-list,
  .related-grid,
  .related-links,
  .related-list,
  .verify-list,
  .feedback-links,
  .path-card-grid,
  .step-list,
  .caution-list,
  .method-steps {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .shelf-cards .shelf-card {
    flex-direction: column;
    gap: 16px;
  }

  .shelf-card-media {
    flex: 0 0 auto;
    width: 100%;
    aspect-ratio: 16 / 9;
  }

  .shelf-tags {
    margin-bottom: 26px;
  }

  .tag-row {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .tag-row li {
    flex: 0 0 auto;
  }

  .page-head-figure,
  .log-divider,
  .page-hero-figure,
  .faq-visual {
    aspect-ratio: 16 / 9;
  }

  .log-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .log-status {
    justify-self: start;
  }

  .note-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    padding: 22px 0;
  }

  .note-media {
    aspect-ratio: 16 / 9;
  }

  .note-fields-list,
  .path-card-fields {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .note-fields-list dt,
  .path-card-fields dt {
    margin-top: 8px;
  }

  .step-item,
  .method-step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 4px 12px;
  }

  .step-item .step-number,
  .method-step .step-number {
    width: 30px;
    height: 30px;
    font-size: 13px;
  }

  .error-main {
    padding: 48px 0 64px;
  }

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

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

  .error-actions .error-btn {
    flex: 1 1 auto;
  }
}

/* --------------------------------------------------------------------------
   responsive · 390px
   -------------------------------------------------------------------------- */

@media (max-width: 420px) {
  .container {
    padding: 0 14px;
  }

  .header-inner {
    padding: 0 14px;
  }

  .breadcrumb,
  .page-header {
    padding-left: 14px;
    padding-right: 14px;
  }

  .brand {
    font-size: 19px;
  }

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

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

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

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

  .feature-block,
  .shelf-card,
  .path-card,
  .focus-item,
  .field-card,
  .coord-item,
  .related-card,
  .verify-item,
  .caution-item,
  .legend-item {
    padding: 16px;
  }

  .boundary-inner {
    padding: 18px;
  }

  .hero-actions .btn {
    flex: 1 1 100%;
  }
}