/* =========================================================
   虫虫漫画 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================= */

/* ---------------------------------------------------------
   1. base —— 变量、重置、排版、通用元素
   --------------------------------------------------------- */
:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --ink: #16202b;
  --ink-soft: #5b6b7a;
  --line: #dfe4ea;
  --primary: #2f6f8f;
  --primary-soft: #e8f1f5;
  --accent: #e08a3c;
  --accent-soft: #fdf2e6;
  --radius: 6px;
  --radius-lg: 8px;
  --wrap: 1120px;
  --read: 760px;
  --shadow: 0 1px 2px rgba(22, 32, 43, .05);
  --shadow-hover: 0 6px 16px rgba(22, 32, 43, .09);
}

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

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

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  font-variant-numeric: tabular-nums;
}

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

p {
  margin: 0;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color .18s ease;
}

a:hover,
a:focus-visible {
  color: #1f5570;
  text-decoration: underline;
  text-underline-offset: 3px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 0;
}

figure {
  margin: 0;
}

dl,
dt,
dd {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
}

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

/* ---------------------------------------------------------
   2. layout —— 骨架：事实条、页头、导航、主容器、页脚
   --------------------------------------------------------- */

/* 顶部事实条 */
.fact-bar {
  background: var(--primary);
  color: #f2f7fa;
}

.fact-bar p {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 8px 24px;
  font-size: 13.5px;
  line-height: 1.6;
}

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

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1px;
  padding: 10px 0;
  text-decoration: none;
  color: var(--ink);
}

.brand:hover,
.brand:focus-visible {
  text-decoration: none;
  color: var(--ink);
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
}

.brand-tag {
  font-size: 12.5px;
  color: var(--ink-soft);
  line-height: 1.4;
}

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

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

.nav-list > li > a {
  display: inline-block;
  padding: 9px 12px;
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--ink);
  white-space: nowrap;
}

.nav-list > li > a:hover,
.nav-list > li > a:focus-visible {
  background: var(--primary-soft);
  color: var(--primary);
  text-decoration: none;
}

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

/* 汉堡按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

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

/* 主内容 */
.site-main {
  display: block;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
}

.inner-main {
  padding-top: 18px;
  padding-bottom: 56px;
}

.home-main {
  padding-bottom: 56px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 4px 0 14px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

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

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

.breadcrumb-sep {
  color: #b6bfc9;
}

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

/* 页脚 */
.site-footer {
  margin-top: 8px;
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 40px 24px 28px;
  display: grid;
  grid-template-columns: minmax(240px, 1.4fr) repeat(3, minmax(150px, 1fr)) minmax(200px, 1.2fr);
  gap: 28px 26px;
}

.footer-brand .footer-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 6px;
}

.footer-desc {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.footer-col ul a {
  font-size: 13.5px;
  color: var(--ink-soft);
}

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

.footer-note p {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.7;
}

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

.footer-bottom p {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 16px 24px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* ---------------------------------------------------------
   3. components —— 全站复用组件
   --------------------------------------------------------- */

/* 区块标题系统 */
.section-head {
  margin-bottom: 20px;
}

.section-head h2,
.section-title,
.section-plain-title {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-desc,
.section-lead,
.section-intro {
  max-width: var(--read);
  font-size: 15px;
  color: var(--ink-soft);
}

.section-head .section-desc,
.section-lead {
  margin-top: 6px;
}

.section-foot {
  margin-top: 16px;
  font-size: 14px;
}

.section-note {
  margin-top: 14px;
  font-size: 14px;
  color: var(--ink-soft);
}

.col-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.col-desc {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

.sub-title,
.subsection-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 4px;
  font-size: 12.5px;
  line-height: 1.7;
  white-space: nowrap;
}

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

.tag-state,
.tag-status {
  background: var(--accent-soft);
  color: #a9621f;
}

/* 封面条目卡 */
.cover-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.cover-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.cover-card img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: var(--primary-soft);
}

.cover-name {
  font-size: 15px;
  font-weight: 700;
  padding: 10px 12px 6px;
  line-height: 1.5;
}

.cover-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 12px 12px;
}

/* 更新记录行（首页 / 内页共用基类，父级限定区分） */
.update-group {
  margin-bottom: 16px;
}

.update-date {
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 8px;
}

.update-list,
.update-rows {
  display: flex;
  flex-direction: column;
}

.update-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 2px;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
}

.update-list .update-row:last-child,
.update-rows .update-row:last-child {
  border-bottom: 0;
}

.update-name {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--ink);
}

.update-row a {
  color: var(--ink);
}

.update-row a:hover,
.update-row a:focus-visible {
  color: var(--primary);
}

/* 更新页内的条目行结构 */
.update-row-link {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px 2px;
  color: var(--ink);
}

.update-row-link:hover,
.update-row-link:focus-visible {
  text-decoration: none;
}

.update-thumb {
  flex: 0 0 auto;
  width: 46px;
  height: 62px;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.update-row-main {
  flex: 1 1 auto;
  min-width: 0;
}

.update-row-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}

.update-row-link:hover .update-row-name {
  color: var(--primary);
}

.update-row-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* 位次条目 */
.rank-list {
  display: flex;
  flex-direction: column;
}

.rank-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 2px;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
}

.rank-list .rank-row:last-child {
  border-bottom: 0;
}

.rank-no {
  flex: 0 0 auto;
  min-width: 26px;
  height: 24px;
  padding: 0 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 700;
}

.rank-name {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--ink);
}

/* 字段口径 / 依据对照 */
.field-cols,
.boundary-layout {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2fr);
  gap: 22px;
  align-items: start;
}

.field-name-list,
.field-def-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.field-name-list li,
.field-def-list li {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
  line-height: 1.7;
}

.field-name-list li {
  font-weight: 700;
  background: var(--surface);
}

.field-def-list li {
  background: var(--surface);
}

.field-name-list li:first-child,
.field-def-list li:first-child {
  border-top: 1px solid var(--line);
}

.field-names,
.field-defs {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

.field-names .col-title,
.field-defs .col-title {
  padding: 12px 12px 0;
  margin-bottom: 6px;
}

/* 步骤清单 */
.step-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.step-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.step-no,
.step-index {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 4px;
  padding: 1px 9px;
  margin-bottom: 10px;
}

.step-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.step-text,
.step-desc {
  font-size: 14.5px;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.step-check,
.step-point {
  font-size: 14px;
  color: var(--ink);
  padding-left: 12px;
  border-left: 3px solid var(--accent);
}

/* 提示框 */
.notice,
.feedback-note,
.topic-tip {
  margin-top: 18px;
  padding: 12px 16px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14px;
  color: #7d4a15;
}

.tip-box {
  margin-top: 18px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.tip-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 6px;
}

.tip-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--ink-soft);
}

.tip-list li {
  padding-left: 14px;
  position: relative;
}

.tip-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
}

/* 站内栏目索引 */
.index-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.index-card {
  display: block;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  color: var(--ink);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.index-card:hover,
.index-card:focus-visible {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
  text-decoration: none;
  color: var(--ink);
}

.index-name {
  font-size: 16px;
  margin-bottom: 6px;
}

.index-card:hover .index-name {
  color: var(--primary);
}

.index-desc {
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.7;
}

/* 相关推荐条 */
.related-strip,
.related-section,
.related-links,
.related-bar {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.related-title {
  font-size: 17px;
  margin-bottom: 12px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
}

.related-item a {
  display: block;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14.5px;
  color: var(--ink);
  transition: border-color .18s ease, color .18s ease;
}

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

.related-name {
  display: block;
  font-weight: 700;
}

.related-desc {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* 锚点索引 */
.anchor-index,
.anchor-bar {
  margin-bottom: 26px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.anchor-index-label,
.anchor-title {
  display: block;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.anchor-index-list,
.anchor-list,
.anchor-bar ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.anchor-index-list a,
.anchor-list a,
.anchor-bar ul a {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--ink);
}

.anchor-index-list a:hover,
.anchor-list a:hover,
.anchor-bar ul a:hover,
.anchor-index-list a:focus-visible,
.anchor-list a:focus-visible,
.anchor-bar ul a:focus-visible {
  border-color: var(--primary);
  color: var(--primary);
  text-decoration: none;
}

/* 编号清单 */
.checklist {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.checklist-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}

.checklist-name,
.checklist-title {
  font-size: 15.5px;
  margin-bottom: 6px;
}

.checklist-desc,
.checklist-body p {
  font-size: 14px;
  color: var(--ink-soft);
}

.checklist-num {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 4px;
  padding: 1px 9px;
  margin-bottom: 8px;
}

/* 通用容器 */
.container {
  max-width: 100%;
}

/* ---------------------------------------------------------
   4. pages —— 各页面业务模块
   --------------------------------------------------------- */

/* ---------- 首页 ---------- */
.home-main .hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 34px;
  padding: 30px 0 34px;
  border-bottom: 1px solid var(--line);
}

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

.hero-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 4px;
  padding: 2px 10px;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 30px;
  line-height: 1.35;
  margin-bottom: 12px;
}

.hero-summary {
  max-width: 46ch;
  font-size: 15.5px;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.hero-paths {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hero-paths a {
  display: block;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14.5px;
  color: var(--ink);
}

.hero-paths a:hover,
.hero-paths a:focus-visible {
  border-color: var(--primary);
  color: var(--primary);
  text-decoration: none;
}

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

.hero-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  margin-bottom: 16px;
}

.hero-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--primary-soft);
}

.hero-figure figcaption {
  padding: 9px 14px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

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

/* 题材方向总览 */
.topics-overview {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

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

.topic-col {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.topic-no {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 4px;
  padding: 1px 9px;
  display: inline-block;
  margin-bottom: 10px;
}

.topic-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.topic-scope {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.topic-feature {
  font-size: 14px;
  color: var(--ink-soft);
  margin-bottom: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
}

.topic-rep {
  font-size: 13.5px;
}

.topic-index {
  margin-top: 16px;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.topic-index ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.topic-index a {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--ink);
}

.topic-index a:hover,
.topic-index a:focus-visible {
  border-color: var(--primary);
  color: var(--primary);
  text-decoration: none;
}

/* 封面条目速览 */
.cover-stream {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

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

/* 最近更新与位次参考 */
.update-rank {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.update-rank-cols {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 30px;
  margin-top: 18px;
}

.update-col,
.rank-col {
  min-width: 0;
}

/* 条目字段口径摘要 */
.field-brief {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

/* 查阅路径 */
.path-guide {
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.path-guide .step-list {
  margin-top: 18px;
}

/* 站内栏目索引 */
.site-index {
  padding: 34px 0 0;
}

.site-index .index-grid {
  margin-top: 18px;
}

/* ---------- 内页公共标题区 ---------- */
.page-header {
  padding: 6px 0 22px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}

.page-description {
  max-width: var(--read);
  font-size: 15.5px;
  color: var(--ink-soft);
}

.page-note,
.page-notice {
  max-width: var(--read);
  margin-top: 10px;
  padding: 9px 14px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 13.5px;
  color: #7d4a15;
}

/* ---------- 题材分类页 ---------- */
.topic-groups {
  margin-bottom: 34px;
}

.topic-groups .section-title,
.topic-samples .section-title,
.topic-checklist .section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

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

.topic-group {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 16px;
}

.topic-figure {
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 12px;
}

.topic-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--primary-soft);
}

.topic-group .topic-index {
  margin: 0 0 8px;
  padding: 0;
  background: none;
  border: 0;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
}

.topic-group .topic-name {
  font-size: 17px;
  margin-bottom: 10px;
}

.topic-fields {
  display: grid;
  grid-template-columns: minmax(88px, auto) minmax(0, 1fr);
  gap: 8px 14px;
  font-size: 14px;
}

.topic-fields dt {
  font-weight: 700;
  color: var(--ink);
}

.topic-fields dd {
  color: var(--ink-soft);
}

.topic-samples {
  margin-bottom: 34px;
}

.sample-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.sample-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}

.sample-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.sample-cover {
  overflow: hidden;
}

.sample-cover img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  background: var(--primary-soft);
}

.sample-name {
  font-size: 15px;
  padding: 10px 12px 6px;
  line-height: 1.5;
}

.sample-name a {
  color: var(--ink);
}

.sample-name a:hover,
.sample-name a:focus-visible {
  color: var(--primary);
}

.sample-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 12px 12px;
}

.topic-checklist {
  margin-bottom: 10px;
}

/* ---------- 最近更新页 ---------- */
.update-visual {
  margin-bottom: 30px;
}

.update-figure {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
}

.update-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  background: var(--primary-soft);
}

.update-figure figcaption {
  padding: 9px 14px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.page-layout {
  margin-bottom: 10px;
}

.update-records,
.update-tags,
.update-scope {
  margin-bottom: 34px;
}

.update-records .section-intro,
.update-tags .section-intro,
.update-scope .section-intro {
  margin-bottom: 18px;
}

.update-records .update-group {
  margin-bottom: 20px;
}

.update-records .section-foot {
  margin-top: 10px;
}

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

.tag-legend-col {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}

.legend-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-soft);
}

.legend-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.scope-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.scope-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}

.scope-card p {
  font-size: 14px;
  color: var(--ink-soft);
}

/* ---------- 人气位次页 ---------- */
.rank-section {
  margin-bottom: 34px;
}

.rank-section .section-lead {
  margin-bottom: 18px;
}

.rank-section .rank-row {
  align-items: flex-start;
  gap: 14px;
  padding: 14px 2px;
}

.rank-cover {
  flex: 0 0 auto;
  width: 56px;
  height: 76px;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--line);
}

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

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

.rank-body .rank-name {
  font-size: 16px;
  margin-bottom: 6px;
}

.rank-body .rank-name a {
  color: var(--ink);
}

.rank-body .rank-name a:hover,
.rank-body .rank-name a:focus-visible {
  color: var(--primary);
}

.rank-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.rank-desc {
  font-size: 14px;
  color: var(--ink-soft);
}

.basis-section {
  margin-bottom: 34px;
}

.basis-section .section-lead {
  margin-bottom: 18px;
}

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

.basis-row {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(0, 2.2fr);
  border-bottom: 1px solid var(--line);
}

.basis-row:last-child {
  border-bottom: 0;
}

.basis-key {
  padding: 12px 16px;
  font-weight: 700;
  font-size: 14.5px;
  background: #fbfcfd;
  border-right: 1px solid var(--line);
}

.basis-value {
  padding: 12px 16px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.pick-section {
  margin-bottom: 10px;
}

.pick-section .section-lead {
  margin-bottom: 18px;
}

.pick-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.pick-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}

.pick-name {
  font-size: 15.5px;
  margin-bottom: 6px;
}

.pick-text {
  font-size: 14px;
  color: var(--ink-soft);
}

/* ---------- 条目字段说明页 ---------- */
.field-section {
  margin-bottom: 34px;
}

.field-section .section-lead,
.boundary-section .section-lead,
.checklist-section .section-lead {
  margin-bottom: 18px;
}

.field-layout {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(0, 1.9fr);
  gap: 24px;
  align-items: start;
}

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

.field-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: var(--primary-soft);
}

.field-figure figcaption {
  padding: 9px 14px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.field-list {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
}

.field-row {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(0, 2fr);
  border-bottom: 1px solid var(--line);
}

.field-row:last-child {
  border-bottom: 0;
}

.field-name {
  padding: 11px 14px;
  font-weight: 700;
  font-size: 14.5px;
  background: #fbfcfd;
  border-right: 1px solid var(--line);
}

.field-desc {
  padding: 11px 14px;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.boundary-section {
  margin-bottom: 34px;
}

.boundary-col {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 14px;
  color: var(--ink-soft);
}

.boundary-list li {
  padding-left: 16px;
  position: relative;
}

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

.checklist-section {
  margin-bottom: 10px;
}

/* ---------- 查阅路径指引页 ---------- */
.section-steps,
.section-checkpoints,
.section-feedback,
.section-faq {
  margin-bottom: 34px;
}

.section-steps > h2,
.section-checkpoints > h2,
.section-feedback > h2,
.section-faq > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-media {
  margin: 16px 0 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
}

.section-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  background: var(--primary-soft);
}

.section-media figcaption {
  padding: 9px 14px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.checkpoint-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.checkpoint-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}

.checkpoint-name {
  font-size: 15.5px;
  margin-bottom: 10px;
}

.field-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 10px;
}

.field-tags li {
  font-size: 12.5px;
  color: var(--primary);
  background: var(--primary-soft);
  border-radius: 4px;
  padding: 1px 8px;
}

.checkpoint-note {
  font-size: 14px;
  color: var(--ink-soft);
}

.feedback-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.feedback-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
}

.feedback-name {
  font-size: 15.5px;
  margin-bottom: 6px;
}

.feedback-item p {
  font-size: 14px;
  color: var(--ink-soft);
}

.notice-box {
  padding: 14px 16px;
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.notice-title {
  font-size: 15px;
  font-weight: 700;
  color: #7d4a15;
  margin-bottom: 6px;
}

.notice-box p {
  font-size: 14px;
  color: #7d4a15;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 12px 16px;
  margin-bottom: 10px;
}

.faq-item summary {
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 700;
  list-style: none;
  position: relative;
  padding-right: 26px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-size: 18px;
  line-height: 1.4;
  color: var(--primary);
}

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

.faq-item summary:hover {
  color: var(--primary);
}

.faq-item p {
  margin-top: 10px;
  font-size: 14.5px;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}

/* ---------- 404 ---------- */
.error-main {
  padding-top: 40px;
  padding-bottom: 56px;
}

.error-panel {
  max-width: var(--read);
  padding: 26px 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.error-code {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 2px 10px;
  display: inline-block;
  margin-bottom: 12px;
}

.error-title {
  font-size: 30px;
  margin-bottom: 12px;
}

.error-text {
  font-size: 15px;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.error-home {
  display: inline-block;
  margin-top: 14px;
  padding: 10px 20px;
  background: var(--primary);
  color: #ffffff;
  border-radius: var(--radius);
  font-size: 15px;
}

.error-home:hover,
.error-home:focus-visible {
  background: #1f5570;
  color: #ffffff;
  text-decoration: none;
}

.error-links {
  margin-top: 30px;
}

.error-subtitle {
  font-size: 18px;
  margin-bottom: 12px;
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 10px;
}

.error-link-list a {
  display: block;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14.5px;
  color: var(--ink);
}

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

/* ---------------------------------------------------------
   5. responsive —— 900px / 600px 两档
   --------------------------------------------------------- */
@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 0;
    padding: 0 18px;
  }

  .brand {
    flex: 1 1 auto;
    min-width: 0;
  }

  .nav-toggle {
    display: flex;
    flex: 0 0 auto;
  }

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 12px;
    border-top: 1px solid var(--line);
  }

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

  .nav-list > li > a {
    display: block;
    padding: 12px 6px;
    border-radius: 0;
    border-bottom: 1px solid var(--line);
    font-size: 15.5px;
  }

  .nav-list > li:last-child > a {
    border-bottom: 0;
  }

  .site-main {
    padding: 0 18px;
  }

  .fact-bar p {
    padding: 8px 18px;
  }

  .home-main .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 22px 0 26px;
  }

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

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

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

  .update-rank-cols {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .field-cols,
  .boundary-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 32px 18px 24px;
    gap: 24px 20px;
  }

  .footer-brand,
  .footer-note {
    grid-column: 1 / -1;
  }

  .footer-bottom p {
    padding: 14px 18px;
  }

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

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

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

  .tag-legend,
  .scope-grid,
  .checkpoint-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .field-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

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

@media (max-width: 600px) {
  body {
    font-size: 15.5px;
  }

  .header-inner,
  .site-main,
  .fact-bar p,
  .footer-inner,
  .footer-bottom p {
    padding-left: 14px;
    padding-right: 14px;
  }

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

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

  .section-head h2,
  .section-title,
  .section-plain-title,
  .topic-groups .section-title,
  .topic-samples .section-title,
  .topic-checklist .section-title,
  .section-steps > h2,
  .section-checkpoints > h2,
  .section-feedback > h2,
  .section-faq > h2 {
    font-size: 19px;
  }

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

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

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

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

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

  .step-list,
  .checklist,
  .pick-list,
  .feedback-list,
  .related-list,
  .error-link-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 22px;
  }

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

  .topic-fields dt {
    margin-top: 8px;
  }

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

  .field-name,
  .basis-key {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding-bottom: 6px;
  }

  .field-desc,
  .basis-value {
    padding-top: 8px;
  }

  .error-panel {
    padding: 20px 18px;
  }

  .update-row-link {
    gap: 10px;
  }

  .update-thumb {
    width: 40px;
    height: 54px;
  }

  .rank-cover {
    width: 48px;
    height: 64px;
  }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}