:root {
  --paper: #f7f4ef;
  --ink: #1f2430;
  --ink-soft: #4a5160;
  --ink-mute: #6b7280;
  --line: #e2ddd4;
  --line-strong: #cdc6ba;
  --accent: #c8452f;
  --accent-dark: #a6361f;
  --ongoing: #2f7d5c;
  --finished: #8a8f98;
  --paused: #b8862b;
  --surface: #fffdfa;
  --surface-alt: #f1ece4;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-sm: 0 1px 2px rgba(31, 36, 48, 0.06);
  --shadow-md: 0 6px 18px rgba(31, 36, 48, 0.1);
  --container: 1120px;
  --gutter: 24px;
  --font: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
}

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

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

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

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

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

p {
  margin: 0;
}

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

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

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

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

figure {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

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

/* ===== layout：站点骨架 ===== */

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

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

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  padding: 6px 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

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

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

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

.nav-list li {
  display: block;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}

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

.nav-list a.is-current {
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-left: auto;
  padding: 0 10px;
  background-color: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

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

.home-main {
  display: block;
}

.inner-main {
  display: block;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter) 72px;
}

.section {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  margin-bottom: 28px;
}

.section-title {
  font-size: 20px;
  font-weight: 700;
}

.section-desc {
  flex: 1 1 320px;
  font-size: 15px;
  color: var(--ink-mute);
}

.section-desc a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 69, 47, 0.35);
}

.section-desc a:hover,
.section-desc a:focus-visible {
  border-bottom-color: var(--accent);
}

.section-intro {
  margin-bottom: 24px;
  font-size: 15px;
  color: var(--ink-mute);
}

.section-intro a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 69, 47, 0.35);
}

.column-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  font-size: 16px;
  font-weight: 700;
  border-bottom: 1px solid var(--line-strong);
}

.subsection-title {
  margin-bottom: 12px;
  font-size: 15px;
  font-weight: 700;
}

/* ===== components：按钮与状态 ===== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 700;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

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

.btn-ghost {
  background-color: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}

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

.status-dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 8px;
  border-radius: 50%;
  background-color: var(--finished);
  vertical-align: middle;
}

.status-dot.status-ongoing {
  background-color: var(--ongoing);
}

.status-dot.status-finished {
  background-color: var(--finished);
}

.status-dot.status-paused {
  background-color: var(--paused);
}

.update-status,
.work-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--ink-mute);
}

.update-status::before,
.work-status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--finished);
}

.update-status.status-ongoing::before,
.work-status.status-ongoing::before {
  background-color: var(--ongoing);
}

.update-status.status-finished::before,
.work-status.status-finished::before {
  background-color: var(--finished);
}

.update-status.status-paused::before,
.work-status.status-paused::before {
  background-color: var(--paused);
}

.work-status.status-done::before {
  background-color: var(--finished);
}

/* ===== pages：首页 ===== */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 44px var(--gutter) 52px;
}

.hero-lead {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  min-width: 0;
}

.hero-eyebrow {
  display: inline-block;
  padding: 4px 10px;
  font-size: 13px;
  color: var(--accent);
  background-color: rgba(200, 69, 47, 0.08);
  border-radius: var(--radius-sm);
}

.hero-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
}

.hero-text {
  max-width: 30em;
  font-size: 16px;
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.hero-figure {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background-color: var(--surface-alt);
}

.hero-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.cover-wall {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.cover-wall-item {
  min-width: 0;
}

.cover-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 8px;
  color: var(--ink);
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.cover-card:hover,
.cover-card:focus-visible {
  color: var(--ink);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.cover-card img {
  width: 100%;
  height: 118px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: var(--surface-alt);
}

.cover-name {
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
}

.cover-tag {
  font-size: 13px;
  color: var(--ink-mute);
}

/* 首页：题材分类总表 */

.section-topics .topic-table {
  display: block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
  overflow: hidden;
}

.topic-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 200px) minmax(0, 1fr) 108px;
  align-items: center;
  gap: 16px;
  padding: 14px 18px;
  border-top: 1px solid var(--line);
}

.topic-row:first-child {
  border-top: 0;
}

.topic-row-head {
  background-color: var(--surface-alt);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-mute);
}

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

.topic-col-no {
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--ink-mute);
}

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

.topic-col-name a:hover,
.topic-col-name a:focus-visible {
  color: var(--accent);
}

.topic-col-scope {
  font-size: 15px;
  color: var(--ink-soft);
}

.topic-col-count {
  font-size: 14px;
  color: var(--ink-mute);
  text-align: right;
}

/* 首页：最近更新速览 */

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

.section-updates .update-group {
  padding: 18px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.update-group-title {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 10px;
  font-size: 15px;
  font-weight: 700;
  border-bottom: 1px solid var(--line);
}

.section-updates .update-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.section-updates .update-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
  padding: 9px 0;
  border-top: 1px dashed var(--line);
}

.section-updates .update-item:first-child {
  border-top: 0;
}

.section-updates .update-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.section-updates .update-topic {
  font-size: 13px;
  color: var(--ink-mute);
}

/* 首页：榜单与合集双栏 */

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

.rank-column,
.collection-column {
  min-width: 0;
}

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

.rank-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.rank-item:first-child {
  border-top: 0;
}

.rank-no {
  font-size: 18px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.rank-link {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.rank-link:hover,
.rank-link:focus-visible {
  color: var(--accent);
}

.rank-topic {
  font-size: 13px;
  color: var(--ink-mute);
}

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

.collection-item {
  min-width: 0;
}

.collection-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 14px;
  color: var(--ink);
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.collection-card:hover,
.collection-card:focus-visible {
  color: var(--ink);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.collection-name {
  font-size: 15px;
  font-weight: 700;
}

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

.collection-logic {
  font-size: 13px;
  color: var(--ink-mute);
}

/* 首页：阅读顺序四步 */

.step-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.step-item {
  padding: 18px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
}

.step-no {
  display: block;
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.step-name {
  margin-bottom: 8px;
  font-size: 16px;
  font-weight: 700;
}

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

/* 首页：字段口径与整理边界 */

.fields-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.fields-column {
  min-width: 0;
}

.fields-column .field-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.fields-column .field-item {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.fields-column .field-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.fields-column .field-name {
  margin-bottom: 4px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

.fields-column .field-text {
  font-size: 15px;
  color: var(--ink-soft);
}

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

.boundary-item {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  color: var(--ink-soft);
}

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

/* 首页：站内栏目索引 */

.column-index {
  display: block;
}

.column-index-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.column-index-item {
  min-width: 0;
}

.column-index-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 16px;
  color: var(--ink);
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.column-index-link:hover,
.column-index-link:focus-visible {
  color: var(--ink);
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.column-index-name {
  font-size: 15px;
  font-weight: 700;
}

.column-index-text {
  font-size: 13px;
  color: var(--ink-mute);
}

/* ===== pages：内页通用 ===== */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 0;
  font-size: 14px;
  color: var(--ink-mute);
}

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

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

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

.breadcrumb-current {
  color: var(--ink);
  font-weight: 700;
}

.page-header {
  padding: 20px 0 28px;
  margin-bottom: 32px;
  border-bottom: 2px solid var(--ink);
}

.page-description {
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--ink-mute);
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
}

.page-lead {
  margin-top: 12px;
  max-width: 46em;
  font-size: 16px;
  color: var(--ink-soft);
}

.page-lead a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 69, 47, 0.35);
}

.page-meta {
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-mute);
}

.page-layout {
  display: block;
}

/* ===== pages：题材分类 ===== */

.page-topics .topic-block {
  margin-bottom: 56px;
}

.page-topics .topic-item {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}

.page-topics .topic-item:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.topic-item-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.topic-code {
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.topic-name {
  font-size: 20px;
  font-weight: 700;
}

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

.topic-item-text {
  min-width: 0;
}

.topic-scope {
  margin-bottom: 16px;
  font-size: 16px;
  color: var(--ink-soft);
}

.topic-subtitle {
  margin-bottom: 10px;
  font-size: 15px;
  font-weight: 700;
}

.topic-settings {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.topic-settings li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--ink-soft);
}

.topic-settings li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--accent);
  border-radius: 50%;
}

.topic-tip {
  padding: 12px 14px;
  font-size: 14px;
  color: var(--ink-soft);
  background-color: var(--surface-alt);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.topic-tip a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 69, 47, 0.35);
}

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

.topic-figure img {
  width: 100%;
  height: 190px;
  object-fit: cover;
}

.topic-figure figcaption {
  padding: 10px 12px;
  font-size: 13px;
  color: var(--ink-mute);
  border-top: 1px solid var(--line);
}

.page-topics .topic-relations {
  margin-bottom: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.relation-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.relation-column {
  min-width: 0;
}

.column-text {
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--ink-soft);
}

.relation-tips {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.relation-tips li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  color: var(--ink-soft);
}

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

.page-topics .topic-works {
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

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

.work-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.work-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.work-cover {
  overflow: hidden;
  background-color: var(--surface-alt);
  border-radius: var(--radius-sm);
}

.work-cover img {
  width: 100%;
  height: 168px;
  object-fit: cover;
}

.work-name {
  font-size: 15px;
  font-weight: 700;
}

.work-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--ink-mute);
}

.work-topic {
  padding: 2px 8px;
  color: var(--accent);
  background-color: rgba(200, 69, 47, 0.08);
  border-radius: var(--radius-sm);
}

.works-more {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
  font-size: 15px;
}

.works-more a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 69, 47, 0.35);
}

/* ===== pages：最近更新 ===== */

.page-updates .updates-section {
  margin-bottom: 56px;
}

.page-updates .update-group {
  margin-bottom: 32px;
  padding: 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.group-title {
  display: flex;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  font-size: 17px;
  font-weight: 700;
  border-bottom: 1px solid var(--line);
}

.page-updates .update-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-updates .update-item {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

.page-updates .update-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.update-cover {
  overflow: hidden;
  background-color: var(--surface-alt);
  border-radius: var(--radius-sm);
}

.update-cover img {
  width: 100%;
  height: 118px;
  object-fit: cover;
}

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

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

.update-meta {
  font-size: 13px;
  color: var(--ink-mute);
}

.update-change {
  margin-top: 6px;
  font-size: 14px;
  color: var(--ink-soft);
}

.page-updates .field-section {
  margin-bottom: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.page-updates .field-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-updates .field-item {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 20px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.page-updates .field-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-updates .field-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
}

.page-updates .field-desc {
  font-size: 15px;
  color: var(--ink-soft);
}

.page-updates .order-section {
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.order-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.order-column {
  min-width: 0;
}

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

.order-item {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  color: var(--ink-soft);
}

.order-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--accent);
  border-radius: 50%;
}

/* ===== pages：人气榜单 ===== */

.page-rankings .page-layout {
  display: flex;
  flex-direction: column;
  gap: 56px;
}

.page-rankings .ranking-section,
.page-rankings .collection-section,
.page-rankings .criteria-section,
.page-rankings .related-section {
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.page-rankings .ranking-section {
  padding-top: 0;
  border-top: 0;
}

.ranking-list {
  display: flex;
  flex-direction: column;
}

.ranking-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.ranking-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.ranking-no {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
  line-height: 1.3;
}

.ranking-entry {
  min-width: 0;
}

.ranking-name {
  margin-bottom: 6px;
  font-size: 17px;
  font-weight: 700;
}

.ranking-topic {
  font-size: 13px;
  color: var(--ink-mute);
}

.ranking-note {
  margin-top: 6px;
  font-size: 15px;
  color: var(--ink-soft);
}

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

.page-rankings .collection-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-rankings .collection-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.collection-media {
  overflow: hidden;
  background-color: var(--surface-alt);
  border-radius: var(--radius-sm);
}

.collection-media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.collection-title {
  font-size: 16px;
  font-weight: 700;
}

.collection-title a {
  color: var(--ink);
}

.collection-title a:hover,
.collection-title a:focus-visible {
  color: var(--accent);
}

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

.criteria-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.criteria-column {
  min-width: 0;
}

.criteria-title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  font-size: 16px;
  font-weight: 700;
  border-bottom: 1px solid var(--line-strong);
}

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

.criteria-item {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--ink-soft);
}

.criteria-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--accent);
}

.criteria-label {
  font-weight: 700;
  color: var(--ink);
}

.criteria-footnote {
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-mute);
}

.criteria-footnote a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 69, 47, 0.35);
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.related-item {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.related-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.related-item a {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

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

/* ===== pages：阅读说明 ===== */

.page-reading-guide .page-layout {
  display: block;
}

.guide-figure {
  overflow: hidden;
  margin-bottom: 40px;
  background-color: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.guide-figure-caption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--ink-mute);
  border-top: 1px solid var(--line);
}

.page-reading-guide .guide-section {
  margin-bottom: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.field-block {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
  margin-bottom: 12px;
}

.field-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
}

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

.field-summary::after {
  content: "展开";
  margin-left: auto;
  font-size: 13px;
  color: var(--accent);
}

.field-block[open] .field-summary::after {
  content: "收起";
}

.field-summary .field-name {
  margin-bottom: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.field-hint {
  font-size: 13px;
  color: var(--ink-mute);
}

.field-body {
  padding: 0 18px 16px;
  border-top: 1px solid var(--line);
}

.field-meaning {
  padding-top: 12px;
  font-size: 15px;
  color: var(--ink-soft);
}

.field-meaning a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 69, 47, 0.35);
}

.field-example {
  margin-top: 8px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--ink-mute);
  background-color: var(--surface-alt);
  border-radius: var(--radius-sm);
}

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

.path-column {
  padding: 20px;
  background-color: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.path-title {
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: 700;
}

.path-scene {
  margin-bottom: 14px;
  font-size: 14px;
  color: var(--ink-mute);
}

.path-steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
  counter-reset: path-step;
}

.path-steps li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  color: var(--ink-soft);
  counter-increment: path-step;
}

.path-steps li::before {
  content: counter(path-step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 18px;
  height: 18px;
  font-size: 12px;
  font-weight: 700;
  line-height: 18px;
  text-align: center;
  color: #fff;
  background-color: var(--accent);
  border-radius: 50%;
}

.path-steps a {
  color: var(--accent);
  border-bottom: 1px solid rgba(200, 69, 47, 0.35);
}

.boundary-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

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

.boundary-text {
  margin-bottom: 12px;
  font-size: 15px;
  color: var(--ink-soft);
}

.boundary-note {
  margin-top: 14px;
  padding: 12px 14px;
  font-size: 14px;
  color: var(--ink-soft);
  background-color: var(--surface-alt);
  border-left: 3px solid var(--line-strong);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.feedback-steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feedback-steps li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--ink-soft);
}

.feedback-steps li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--line-strong);
}

.guide-related .related-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 32px;
}

.guide-related .related-item {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.guide-related .related-desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  font-weight: 400;
  color: var(--ink-mute);
}

/* ===== pages：404 ===== */

.error-main {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px var(--gutter) 72px;
}

.error-block {
  max-width: 640px;
  margin-bottom: 48px;
}

.error-code {
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.error-block h1 {
  margin: 12px 0 16px;
  font-size: 34px;
  font-weight: 700;
}

.error-text {
  margin-bottom: 24px;
  font-size: 16px;
  color: var(--ink-soft);
}

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

.error-links {
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.error-links h2 {
  margin-bottom: 16px;
  font-size: 20px;
  font-weight: 700;
}

.error-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.error-list li {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.error-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.error-list a {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.error-list a:hover,
.error-list a:focus-visible {
  color: var(--accent);
}

/* ===== layout：页脚 ===== */

.site-footer {
  margin-top: auto;
  background-color: var(--ink);
  color: #d8d5cf;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  gap: 40px;
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px var(--gutter) 32px;
}

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

.footer-brand {
  margin-bottom: 12px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.footer-text {
  font-size: 14px;
  line-height: 1.8;
  color: #b6b2ab;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

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

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

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

.footer-list a {
  font-size: 14px;
  color: #b6b2ab;
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: #fff;
}

.footer-bottom {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter) 40px;
}

.copyright {
  padding-top: 20px;
  font-size: 13px;
  color: #8f8b85;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

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

@media (max-width: 900px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 0;
    padding: 8px var(--gutter);
  }

  .brand {
    padding: 8px 0;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 1 100%;
    width: 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding-bottom: 8px;
    border-top: 1px solid var(--line);
  }

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

  .nav-list a {
    min-height: 48px;
    padding: 0 6px;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }

  .nav-list a.is-current {
    border-left-color: var(--accent);
    background-color: var(--surface-alt);
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 32px var(--gutter) 40px;
  }

  .hero-title {
    font-size: 28px;
  }

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

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

  .section {
    padding: 40px var(--gutter);
  }

  .topic-row {
    grid-template-columns: 56px minmax(0, 1fr) 88px;
    gap: 12px;
  }

  .topic-col-scope {
    grid-column: 2 / -1;
    font-size: 14px;
  }

  .topic-row-head .topic-col-scope {
    display: none;
  }

  .topic-row-head {
    grid-template-columns: 56px minmax(0, 1fr) 88px;
  }

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

  .rank-collection-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

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

  .fields-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

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

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

  .page-title {
    font-size: 28px;
  }

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

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

  .relation-columns,
  .order-columns,
  .criteria-columns,
  .boundary-columns {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

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

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

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

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

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding: 40px var(--gutter) 28px;
  }

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

@media (max-width: 600px) {
  :root {
    --gutter: 16px;
  }

  body {
    font-size: 15px;
  }

  .brand {
    font-size: 17px;
  }

  .hero {
    padding: 24px var(--gutter) 32px;
  }

  .hero-title {
    font-size: 26px;
  }

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

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

  .cover-card img {
    height: 132px;
  }

  .section {
    padding: 32px var(--gutter);
  }

  .section-title {
    font-size: 18px;
  }

  .section-topics .topic-table {
    border: 0;
    background-color: transparent;
    overflow: visible;
  }

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

  .topic-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 6px 12px;
    margin-bottom: 12px;
    padding: 14px;
    background-color: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  .topic-row:first-child {
    border-top: 1px solid var(--line);
  }

  .topic-col-no {
    grid-column: 1;
    grid-row: 1;
    font-size: 13px;
  }

  .topic-col-name {
    grid-column: 1;
    grid-row: 2;
  }

  .topic-col-count {
    grid-column: 2;
    grid-row: 1 / span 2;
    align-self: center;
    text-align: right;
  }

  .topic-col-scope {
    grid-column: 1 / -1;
    grid-row: 3;
  }

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

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

  .rank-item {
    grid-template-columns: 34px minmax(0, 1fr);
    row-gap: 2px;
  }

  .rank-topic {
    grid-column: 2;
  }

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

  .page-header {
    padding: 16px 0 20px;
    margin-bottom: 24px;
  }

  .page-title {
    font-size: 26px;
  }

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

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

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

  .update-cover img {
    height: 160px;
  }

  .page-updates .field-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .ranking-item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 12px;
  }

  .ranking-no {
    font-size: 20px;
  }

  .collection-media img {
    height: 180px;
  }

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

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

  .error-main {
    padding: 40px var(--gutter) 56px;
  }

  .error-block h1 {
    font-size: 26px;
  }
}