:root {
  --color-ink: #111111;
  --color-ink-soft: #2b2b2b;
  --color-muted: #6b6b6b;
  --color-line: #dcdcd8;
  --color-line-soft: #e8e8e4;
  --color-bg: #f5f5f3;
  --color-surface: #ffffff;
  --color-surface-alt: #efefec;
  --color-invert: #f5f5f3;
  --font-serif: "Songti SC", "SimSun", "Noto Serif CJK SC", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --container: 1180px;
  --radius: 6px;
  --radius-sm: 4px;
  --gap-lg: 40px;
  --gap-md: 24px;
  --gap-sm: 14px;
  --shadow-soft: 0 1px 2px rgba(17, 17, 17, 0.05);
  --transition: 180ms ease;
}

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

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

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

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

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-ink);
}

p {
  margin: 0;
}

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

dl,
dd {
  margin: 0;
}

dt {
  margin: 0;
}

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

figure {
  margin: 0;
}

a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color var(--transition), background-color var(--transition), border-color var(--transition);
}

a:hover {
  color: var(--color-muted);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible {
  outline: 2px solid var(--color-ink);
  outline-offset: 3px;
  border-radius: 2px;
}

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

button {
  font: inherit;
  color: inherit;
}

/* ============================================================
   layout
   ============================================================ */

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

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

.header-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: var(--gap-md);
}

.brand {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-ink);
  white-space: nowrap;
  padding: 10px 0;
}

.brand:hover {
  color: var(--color-ink);
  text-decoration: underline;
  text-underline-offset: 6px;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  display: inline-block;
  padding: 10px 0;
  font-size: 15px;
  color: var(--color-ink-soft);
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-line);
}

.nav-link.is-current {
  color: var(--color-ink);
  font-weight: 600;
  border-bottom-color: var(--color-ink);
}

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

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

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

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

.site-footer {
  margin-top: 72px;
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 40px 24px 32px;
}

.footer-back {
  margin-bottom: 28px;
}

.footer-back-link {
  font-size: 14px;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 2px;
}

.footer-back-link:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-ink);
}

.footer-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-lg);
  padding-bottom: 28px;
  border-bottom: 1px solid var(--color-line-soft);
}

.footer-group-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
}

.footer-links li + li {
  margin-top: 8px;
}

.footer-links a {
  font-size: 14px;
  color: var(--color-muted);
}

.footer-links a:hover {
  color: var(--color-ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-brand {
  margin-top: 24px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
}

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

/* ============================================================
   components
   ============================================================ */

.section {
  padding: 56px 0;
}

.section + .section {
  border-top: 1px solid var(--color-line);
}

.section-head {
  margin-bottom: 28px;
}

.section-title {
  font-size: 24px;
  margin-bottom: 10px;
}

.section-desc,
.section-lead,
.section-intro {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 760px;
}

.section-lead,
.section-intro {
  margin-bottom: 24px;
}

.status-tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  line-height: 1.6;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  background-color: var(--color-surface-alt);
  white-space: nowrap;
}

.status-ongoing,
.status-tag--ongoing {
  color: var(--color-ink);
  border-color: var(--color-ink);
  background-color: transparent;
}

.status-done,
.status-tag--done {
  color: var(--color-muted);
  border-color: var(--color-line);
  background-color: var(--color-surface-alt);
}

.status-new,
.status-tag--new {
  color: var(--color-invert);
  background-color: var(--color-ink);
  border-color: var(--color-ink);
}

.tag {
  display: inline-block;
  padding: 1px 7px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--color-muted);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
}

.panel-title {
  font-size: 18px;
  margin-bottom: 12px;
}

.panel-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-ink);
  padding-bottom: 2px;
}

.panel-more:hover {
  color: var(--color-muted);
  border-bottom-color: var(--color-muted);
}

.btn {
  display: inline-block;
  padding: 11px 22px;
  font-size: 15px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-ink);
  text-align: center;
}

.btn-primary {
  background-color: var(--color-ink);
  color: var(--color-invert);
}

.btn-primary:hover {
  background-color: var(--color-surface);
  color: var(--color-ink);
}

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

.btn-ghost:hover {
  background-color: var(--color-ink);
  color: var(--color-invert);
}

/* ============================================================
   pages - 首页
   ============================================================ */

.fact-bar {
  background-color: var(--color-ink);
  color: var(--color-invert);
}

.fact-bar-text {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 9px 24px;
  font-size: 13px;
  line-height: 1.6;
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--gap-lg);
  padding: 48px 0 8px;
  align-items: start;
}

.hero-info {
  max-width: 520px;
}

.hero-title {
  font-size: 32px;
  margin-bottom: 16px;
}

.hero-summary {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.hero-paths {
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--color-line);
  padding-top: 18px;
}

.hero-path-item {
  font-size: 15px;
}

.path-link {
  display: inline-block;
  padding: 4px 0;
  border-bottom: 1px solid var(--color-line);
}

.path-link:hover {
  border-bottom-color: var(--color-ink);
}

.hero-panels {
  display: grid;
  gap: var(--gap-md);
}

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

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

.hero-visual-caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line-soft);
}

.hero-updates {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 18px 20px 20px;
}

.hero-update-item {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

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

.update-date {
  font-size: 13px;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
}

.update-name {
  font-size: 15px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.topic-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.topic-name {
  font-size: 18px;
  margin-bottom: 10px;
}

.topic-feature {
  font-size: 14px;
  color: var(--color-muted);
  flex: 1 1 auto;
  margin-bottom: 16px;
}

.topic-entry {
  font-size: 14px;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 2px;
  align-self: flex-start;
}

.topic-entry:hover {
  border-bottom-color: var(--color-ink);
}

.shelf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: var(--gap-md);
}

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

.cover-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--color-surface-alt);
}

.cover-name {
  font-size: 16px;
  padding: 12px 14px 6px;
}

.cover-tags {
  padding: 0 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cover-card .status-tag {
  margin: 12px 14px 16px;
  align-self: flex-start;
}

.rank-and-fields {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--gap-lg);
  align-items: start;
}

.rank-column .section-head {
  margin-bottom: 20px;
}

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

.rank-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) minmax(0, 1.2fr);
  align-items: center;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

.rank-no {
  font-family: var(--font-serif);
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  color: var(--color-muted);
}

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

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

.fields-column {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 22px 24px 24px;
}

.fields-column .section-desc {
  margin-bottom: 16px;
}

.field-summary {
  border-top: 1px solid var(--color-line-soft);
}

.field-summary .field-name {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  padding-top: 12px;
}

.field-summary .field-desc {
  font-size: 14px;
  color: var(--color-muted);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line-soft);
}

.field-summary .field-desc:last-of-type {
  border-bottom: none;
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-md);
}

.guide-step {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 22px;
}

.guide-step .step-no {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 10px;
}

.guide-step .step-title {
  font-size: 17px;
  margin-bottom: 10px;
}

.guide-step .step-desc {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.guide-step .step-check {
  font-size: 13px;
  color: var(--color-ink-soft);
  border-top: 1px solid var(--color-line-soft);
  padding-top: 12px;
}

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

.index-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  min-height: 92px;
  padding: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
}

.index-card:hover {
  background-color: var(--color-ink);
  color: var(--color-invert);
  border-color: var(--color-ink);
}

.index-note {
  font-size: 13px;
  font-weight: 400;
  color: var(--color-muted);
}

.index-card:hover .index-note {
  color: var(--color-invert);
}

/* ============================================================
   pages - 内页通用骨架
   ============================================================ */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--color-muted);
}

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

.breadcrumb a:hover {
  color: var(--color-ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

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

.page-header {
  padding: 18px 0 28px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 36px;
}

.page-title {
  font-size: 32px;
  margin-bottom: 12px;
}

.page-description {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 780px;
}

.page-header-wrap {
  display: none;
}

/* ============================================================
   pages - 题材分类
   ============================================================ */

.page-layout {
  display: grid;
  grid-template-columns: minmax(520px, 7fr) minmax(0, 5fr);
  gap: var(--gap-lg);
  align-items: start;
}

.sidebar-left .page-layout {
  grid-template-columns: minmax(0, 4fr) minmax(560px, 8fr);
}

.filter-panel {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 22px 22px 24px;
}

.filter-title {
  font-size: 20px;
  margin-bottom: 10px;
}

.filter-intro {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 18px;
}

.filter-group {
  margin: 0 0 18px;
  padding: 0 0 16px;
  border: none;
  border-bottom: 1px solid var(--color-line-soft);
}

.filter-group:last-of-type {
  border-bottom: none;
}

.filter-group-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  padding: 0;
  margin-bottom: 6px;
}

.filter-group-desc {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 10px;
}

.filter-option {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 4px 0;
  cursor: pointer;
  font-size: 15px;
}

.filter-check {
  width: 17px;
  height: 17px;
  accent-color: var(--color-ink);
  flex: 0 0 auto;
}

.filter-represent {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 4px;
}

.filter-represent a {
  color: var(--color-ink-soft);
  border-bottom: 1px solid var(--color-line);
}

.filter-represent a:hover {
  border-bottom-color: var(--color-ink);
}

.filter-note {
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line-soft);
  padding-top: 14px;
  margin-top: 6px;
}

.filter-cross {
  font-size: 13px;
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.filter-cross a {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
}

.filter-cross a:hover {
  border-bottom-color: var(--color-ink);
}

.result-panel {
  min-width: 0;
}

.result-title {
  font-size: 24px;
  margin-bottom: 10px;
}

.result-intro {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 22px;
}

.result-figure {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

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

.result-figure-caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line-soft);
}

.result-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

.result-item:first-of-type {
  border-top: 1px solid var(--color-line);
}

.result-item-title {
  font-size: 18px;
  margin-bottom: 8px;
}

.result-item-title a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

.tag-state {
  border-color: var(--color-ink);
  color: var(--color-ink);
}

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

.result-more {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
}

.result-more a {
  font-size: 14px;
  border-bottom: 1px solid var(--color-ink);
  padding-bottom: 2px;
}

.result-more a:hover {
  color: var(--color-muted);
  border-bottom-color: var(--color-muted);
}

.guide-section {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--color-line);
}

.guide-title {
  font-size: 24px;
  margin-bottom: 10px;
}

.guide-intro {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
  max-width: 780px;
}

.guide-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-md);
}

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

.guide-item-title {
  font-size: 17px;
  margin-bottom: 10px;
}

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

/* ============================================================
   pages - 最近更新
   ============================================================ */

.update-batch-section,
.update-list-section,
.update-path-section {
  margin-bottom: 52px;
}

.update-batch-section .section-title,
.update-list-section .section-title,
.update-path-section .section-title {
  margin-bottom: 10px;
}

.batch-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-md);
  margin-top: 24px;
}

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

.batch-name {
  font-size: 17px;
  margin-bottom: 8px;
}

.batch-count {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.batch-card .status-tag {
  margin-bottom: 12px;
}

.batch-note {
  font-size: 14px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line-soft);
  padding-top: 12px;
}

.update-timeline {
  margin-top: 24px;
  border-left: 2px solid var(--color-line);
  padding-left: 24px;
}

.update-day {
  padding-bottom: 28px;
}

.update-day:last-child {
  padding-bottom: 0;
}

.update-day .update-date {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 12px;
  position: relative;
}

.update-day .update-date::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 9px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-ink);
}

.update-entry-list {
  display: grid;
  gap: 14px;
}

.update-entry {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 14px;
}

.update-thumb img {
  width: 84px;
  height: 84px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
}

.update-entry-body {
  min-width: 0;
  font-size: 14px;
  color: var(--color-muted);
}

.update-entry-name {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.update-entry-meta {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.path-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-md);
  margin-top: 24px;
}

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

.path-step-no {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 10px;
}

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

.path-step-text a {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
}

.path-step-text a:hover {
  border-bottom-color: var(--color-ink);
}

/* ============================================================
   pages - 人气榜单
   ============================================================ */

.rank-list-section {
  min-width: 0;
}

.rank-list-section .section-desc {
  margin-bottom: 22px;
}

.rank-list-section .rank-item {
  grid-template-columns: 46px 68px minmax(0, 1fr);
  align-items: start;
  padding: 16px 0;
}

.rank-cover img {
  width: 68px;
  height: 68px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
}

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

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

.rank-footnote {
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-muted);
}

.rank-footnote a {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
}

.rank-footnote a:hover {
  border-bottom-color: var(--color-ink);
}

.rank-aside {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 22px 24px 24px;
}

.rank-aside .section-title {
  margin-bottom: 16px;
}

.note-block {
  padding: 14px 0;
  border-top: 1px solid var(--color-line-soft);
}

.note-title {
  font-size: 16px;
  margin-bottom: 8px;
}

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

.note-more {
  display: inline-block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
}

.note-more:hover {
  border-bottom-color: var(--color-ink);
}

.rank-guide {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--color-line);
}

.rank-guide .section-desc {
  margin-bottom: 24px;
}

.rank-guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap-md);
}

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

.guide-card-title {
  font-size: 17px;
  margin-bottom: 10px;
}

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

/* ============================================================
   pages - 条目字段说明
   ============================================================ */

.field-figure {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 44px;
}

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

.field-figure-caption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-line-soft);
}

.field-section,
.boundary-section,
.quick-section,
.faq-section {
  margin-bottom: 52px;
}

.field-list {
  margin-top: 24px;
  border-top: 1px solid var(--color-line);
}

.field-item {
  display: grid;
  grid-template-columns: minmax(150px, 3fr) minmax(0, 9fr);
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line-soft);
}

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

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

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--gap-md);
  margin-top: 24px;
}

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

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

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

.quick-layout {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--gap-lg);
  align-items: start;
  margin-top: 24px;
}

.quick-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-surface);
}

.quick-table {
  min-width: 460px;
  font-size: 14px;
}

.quick-caption {
  caption-side: top;
  text-align: left;
  padding: 14px 16px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
}

.quick-table th,
.quick-table td {
  padding: 11px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-line-soft);
  vertical-align: top;
}

.quick-table thead th {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 600;
  background-color: var(--color-surface-alt);
  white-space: nowrap;
}

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

.quick-table tbody th {
  font-weight: 600;
  color: var(--color-ink);
  white-space: nowrap;
}

.quick-table tbody td {
  color: var(--color-muted);
}

.quick-steps {
  display: grid;
  gap: 12px;
  counter-reset: quick-step;
}

.quick-step {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 16px 18px;
  font-size: 14px;
  color: var(--color-muted);
  counter-increment: quick-step;
}

.quick-step::before {
  content: counter(quick-step, decimal-leading-zero);
  display: block;
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--color-ink);
  margin-bottom: 6px;
}

.quick-step a {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
}

.quick-step a:hover {
  border-bottom-color: var(--color-ink);
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-top: 12px;
}

.faq-question {
  padding: 16px 48px 16px 20px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  color: var(--color-muted);
}

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

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

/* ============================================================
   pages - 404
   ============================================================ */

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

.error-block {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--color-line);
  max-width: 700px;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 64px;
  line-height: 1;
  color: var(--color-line);
  margin-bottom: 16px;
}

.error-title {
  font-size: 32px;
  margin-bottom: 14px;
}

.error-text {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 26px;
}

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

.error-hints {
  padding: 40px 0 0;
}

.error-hints-title {
  font-size: 20px;
  margin-bottom: 16px;
}

.error-hint-list {
  display: grid;
  gap: 10px;
  max-width: 700px;
}

.error-hint-list a {
  display: block;
  padding: 12px 16px;
  min-height: 44px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  font-size: 15px;
}

.error-hint-list a:hover {
  background-color: var(--color-ink);
  color: var(--color-invert);
  border-color: var(--color-ink);
}

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

@media (max-width: 1024px) {
  .home-hero {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap-md);
    padding-top: 36px;
  }

  .hero-info {
    max-width: none;
  }

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

  .rank-and-fields {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap-md);
  }

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

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

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

  .quick-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap-md);
  }

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

@media (max-width: 768px) {
  .header-inner {
    padding: 0 18px;
    min-height: 60px;
    flex-wrap: wrap;
    gap: 12px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 0 100%;
    margin-left: 0;
    order: 3;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 12px;
    border-top: 1px solid var(--color-line);
  }

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

  .nav-list li {
    border-bottom: 1px solid var(--color-line-soft);
  }

  .nav-list li:last-child {
    border-bottom: none;
  }

  .nav-link {
    display: block;
    padding: 13px 2px;
    min-height: 44px;
    border-bottom: none;
  }

  .nav-link.is-current {
    border-bottom: none;
    text-decoration: underline;
    text-underline-offset: 6px;
  }

  .home-main,
  .inner-main,
  .error-main {
    padding: 0 18px;
  }

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

  .home-hero {
    padding-top: 28px;
  }

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

  .section {
    padding: 40px 0;
  }

  .section-title,
  .result-title,
  .guide-title {
    font-size: 20px;
  }

  .hero-visual img {
    height: 220px;
  }

  .hero-update-item {
    grid-template-columns: 82px minmax(0, 1fr);
    row-gap: 4px;
  }

  .hero-update-item .status-tag {
    grid-column: 2;
    justify-self: start;
  }

  .topic-grid,
  .guide-steps,
  .guide-list,
  .path-steps,
  .rank-guide-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .shelf-grid {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--gap-sm);
  }

  .cover-img {
    height: 170px;
  }

  .rank-and-fields .rank-item {
    grid-template-columns: 34px minmax(0, 1fr);
    row-gap: 4px;
  }

  .rank-and-fields .rank-note {
    grid-column: 2;
  }

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

  .page-header {
    padding: 14px 0 22px;
    margin-bottom: 28px;
  }

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

  .update-timeline {
    padding-left: 18px;
  }

  .update-day .update-date::before {
    left: -25px;
  }

  .update-entry {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 12px;
  }

  .update-thumb img {
    width: 64px;
    height: 64px;
  }

  .rank-list-section .rank-item {
    grid-template-columns: 34px 56px minmax(0, 1fr);
    gap: 10px;
  }

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

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

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

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

  .error-block {
    padding: 48px 0 36px;
  }

  .error-code {
    font-size: 48px;
  }

  .footer-inner {
    padding: 32px 18px 26px;
  }

  .footer-groups {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap-md);
  }
}

@media (max-width: 480px) {
  .shelf-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .result-figure img {
    height: 190px;
  }

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