/* ==========================================================================
   樱花动漫 · 全站样式表
   音乐杂志风：强标题节奏、粗细分隔线、封面墙错落排布
   ========================================================================== */

/* ==========================================================================
   base · 变量与基础重置
   ========================================================================== */

:root {
  --color-primary: #e4739a;
  --color-primary-dark: #c9557c;
  --color-ink: #23212b;
  --color-ink-soft: #4d4a58;
  --color-ink-mute: #7d7989;
  --color-bg: #fbf9fa;
  --color-surface: #ffffff;
  --color-line: #e6e2e6;
  --color-line-strong: #d3ccd4;
  --color-accent: #4a7f9e;
  --color-accent-soft: #eef4f7;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-num: "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;

  --width-content: 1180px;
  --radius-card: 8px;
  --radius-sm: 4px;

  --space-xs: 6px;
  --space-sm: 10px;
  --space-md: 16px;
  --space-lg: 26px;
  --space-xl: 40px;
  --space-2xl: 60px;
}

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

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

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

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

ol,
ul {
  list-style: none;
}

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

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

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

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

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

time {
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   layout · 骨架：页头 / 导航 / 主容器 / 页脚
   ========================================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

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

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--color-ink);
}

.brand-mark {
  width: 12px;
  height: 26px;
  border-radius: 2px;
  background-color: var(--color-primary);
  flex: 0 0 auto;
}

.brand-text {
  font-size: 21px;
  font-weight: 800;
  line-height: 1.2;
}

.brand:hover .brand-text,
.brand:focus-visible .brand-text {
  color: var(--color-primary-dark);
}

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

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-ink);
  border-radius: 1px;
}

.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

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

.nav-link {
  display: block;
  padding: 8px 14px;
  min-height: 40px;
  line-height: 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink-soft);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-primary-dark);
  background-color: #fdf1f6;
}

.nav-link.is-current {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
  background-color: #fdf1f6;
}

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

.inner-main {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 0 24px 72px;
}

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

.breadcrumb a {
  color: var(--color-ink-mute);
  border-bottom: 1px solid transparent;
}

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

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

.breadcrumb-current {
  color: var(--color-ink);
  font-weight: 600;
}

.page-header {
  padding: 26px 0 30px;
  border-bottom: 3px solid var(--color-ink);
  margin-bottom: 40px;
}

.page-title {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.28;
  color: var(--color-ink);
}

.page-description {
  margin-top: 14px;
  max-width: 76ch;
  font-size: 16px;
  color: var(--color-ink-soft);
}

.page-description a {
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
}

.page-description a:hover,
.page-description a:focus-visible {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary-dark);
}

.site-footer {
  margin-top: auto;
  background-color: #f4f1f3;
  border-top: 1px solid var(--color-line-strong);
  color: var(--color-ink-soft);
}

.footer-inner {
  width: 100%;
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 42px 24px 26px;
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(3, minmax(150px, 1fr));
  gap: 30px 34px;
}

.footer-brand-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--color-ink);
}

.footer-brand-desc {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-ink-mute);
  max-width: 34ch;
}

.footer-group-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-ink);
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--color-line-strong);
}

.footer-links li + li {
  margin-top: 6px;
}

.footer-links a {
  display: inline-block;
  padding: 3px 0;
  font-size: 14px;
  color: var(--color-ink-soft);
}

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

.footer-copy {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 0 24px 30px;
  font-size: 13px;
  color: var(--color-ink-mute);
}

/* ==========================================================================
   components · 通用栏目标题与索引模块
   ========================================================================== */

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 24px;
  padding-bottom: 14px;
  margin-bottom: 26px;
  border-bottom: 2px solid var(--color-ink);
}

.section-title {
  font-size: 24px;
  font-weight: 800;
  line-height: 1.35;
  color: var(--color-ink);
}

.section-desc,
.section-lead,
.section-note,
.section-intro {
  font-size: 15px;
  color: var(--color-ink-mute);
  max-width: 86ch;
}

.section-desc a,
.section-note a,
.updates-footnote a,
.rule-note a,
.figure-caption a {
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
}

.section-desc a:hover,
.section-note a:hover,
.updates-footnote a:hover,
.rule-note a:hover,
.figure-caption a:hover,
.section-desc a:focus-visible,
.section-note a:focus-visible,
.updates-footnote a:focus-visible,
.rule-note a:focus-visible,
.figure-caption a:focus-visible {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary-dark);
}

.section-lead,
.section-intro {
  margin-bottom: 26px;
}

.site-index .section-title {
  margin-bottom: 20px;
}

/* 站内栏目索引 · 首页卡片式 */
.index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.index-cell {
  padding: 18px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius-card);
}

.index-link {
  display: block;
  font-size: 17px;
  font-weight: 700;
  color: var(--color-ink);
}

.index-link:hover,
.index-link:focus-visible {
  color: var(--color-primary-dark);
}

.index-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--color-ink-mute);
}

/* ==========================================================================
   pages · 首页
   ========================================================================== */

.fact-bar {
  background-color: var(--color-ink);
  color: #f2eef1;
}

.fact-bar-text {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 9px 24px;
  font-size: 13.5px;
  line-height: 1.6;
}

.hero {
  border-bottom: 1px solid var(--color-line);
  background-color: var(--color-surface);
}

.hero-inner {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 46px 24px 52px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 44px;
  align-items: start;
}

.hero-kicker {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.hero-title {
  margin-top: 16px;
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-ink);
}

.hero-summary {
  margin-top: 16px;
  font-size: 16px;
  color: var(--color-ink-soft);
  max-width: 52ch;
}

.hero-paths {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.hero-path {
  border-top: 2px solid var(--color-line-strong);
  padding-top: 10px;
}

.hero-path-link {
  display: block;
  min-height: 44px;
  font-size: 15px;
}

.hero-path-label {
  display: block;
  font-weight: 700;
  color: var(--color-ink);
}

.hero-path-desc {
  display: block;
  margin-top: 4px;
  font-size: 13.5px;
  color: var(--color-ink-mute);
}

.hero-path-link:hover .hero-path-label,
.hero-path-link:focus-visible .hero-path-label {
  color: var(--color-primary-dark);
}

.hero-media {
  display: grid;
  gap: 14px;
}

.hero-figure {
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: #efe9ec;
}

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

.hero-caption {
  padding: 10px 14px;
  font-size: 13.5px;
  color: var(--color-ink-mute);
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

.hero-covers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.hero-cover {
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: #efe9ec;
}

.hero-cover img {
  width: 100%;
  height: 148px;
  object-fit: cover;
}

.hero-cover:first-child {
  transform: translateY(0);
}

.hero-cover:last-child {
  transform: translateY(14px);
}

.section {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 56px 24px 0;
}

.section:last-of-type {
  padding-bottom: 64px;
}

/* 题材方向总览 */
.topic-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 26px;
  border-top: 1px solid var(--color-line);
}

.topic-cell {
  padding: 22px 0 4px;
  border-bottom: 1px solid var(--color-line);
}

.topic-index {
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
}

.topic-name {
  margin-top: 6px;
  font-size: 18px;
  font-weight: 800;
  color: var(--color-ink);
}

.topic-trait {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-ink-mute);
}

.topic-items {
  margin-top: 12px;
  padding-bottom: 16px;
}

.topic-items li + li {
  margin-top: 6px;
}

.topic-items a {
  font-size: 14px;
  color: var(--color-ink-soft);
  border-bottom: 1px dashed var(--color-line-strong);
}

.topic-items a:hover,
.topic-items a:focus-visible {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
}

/* 并列区：封面速览 + 更新清单 */
.split-section {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.split-col-main {
  min-width: 0;
}

.split-col-side {
  min-width: 0;
  padding-left: 32px;
  border-left: 1px solid var(--color-line);
}

.cover-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px 18px;
}

.cover-card {
  border-radius: var(--radius-card);
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  overflow: hidden;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

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

.cover-figure {
  background-color: #efe9ec;
}

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

.cover-name {
  padding: 10px 12px 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--color-ink);
}

.cover-meta {
  padding: 6px 12px 12px;
  font-size: 13px;
  color: var(--color-ink-mute);
}

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

.update-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--color-line);
}

.update-date {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--color-accent);
  padding-top: 1px;
}

.update-body {
  flex: 1 1 200px;
  min-width: 0;
  font-size: 14px;
}

.update-name {
  font-weight: 700;
  color: var(--color-ink);
  border-bottom: 1px solid transparent;
}

.update-name:hover,
.update-name:focus-visible {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary);
}

.update-tag {
  margin-left: 8px;
  padding: 1px 7px;
  font-size: 12px;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  border-radius: var(--radius-sm);
}

.update-note {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  color: var(--color-ink-mute);
}

/* 人气位次 + 字段口径 */
.rank-list {
  border-top: 1px solid var(--color-line);
}

.rank-row {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--color-line);
}

.rank-num {
  flex: 0 0 34px;
  font-family: var(--font-num);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-accent);
}

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

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

.rank-name a {
  border-bottom: 1px solid transparent;
}

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

.rank-tag {
  margin-left: 8px;
  font-size: 12.5px;
  font-weight: 400;
  color: var(--color-ink-mute);
}

.rank-note {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  color: var(--color-ink-mute);
}

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

.field-row {
  display: grid;
  grid-template-columns: minmax(96px, 0.5fr) minmax(0, 1.5fr);
  gap: 6px 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--color-line);
}

.field-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-ink);
}

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

.field-more {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
}

.field-more:hover,
.field-more:focus-visible {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-primary-dark);
}

/* ==========================================================================
   pages · 题材分类
   ========================================================================== */

.topic-directory {
  margin-bottom: 52px;
}

.topic-index-list {
  border-top: 2px solid var(--color-ink);
}

.topic-index-item {
  border-bottom: 1px solid var(--color-line);
}

.topic-index-link {
  display: grid;
  grid-template-columns: 56px minmax(120px, 0.4fr) minmax(0, 1fr);
  gap: 8px 20px;
  align-items: baseline;
  padding: 14px 4px;
  min-height: 44px;
  transition: background-color 0.18s ease;
}

.topic-index-link:hover,
.topic-index-link:focus-visible {
  background-color: #fdf1f6;
}

.topic-index-no {
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-accent);
}

.topic-index-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-ink);
}

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

.topic-groups {
  margin-bottom: 52px;
}

.topic-group {
  display: grid;
  grid-template-columns: minmax(240px, 0.85fr) minmax(0, 1.6fr);
  gap: 34px;
  padding: 30px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.topic-group-desc {
  min-width: 0;
}

.topic-group-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 22px;
  font-weight: 800;
  color: var(--color-ink);
}

.topic-group-no {
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
}

.topic-group-text {
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.topic-group-items {
  min-width: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.work-card {
  border-radius: var(--radius-card);
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  overflow: hidden;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

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

.work-cover {
  background-color: #efe9ec;
}

.work-cover img {
  width: 100%;
  height: 152px;
  object-fit: cover;
}

.work-name {
  padding: 10px 12px 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--color-ink);
}

.work-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  padding: 6px 12px 12px;
  font-size: 12.5px;
}

.work-topic {
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  padding: 1px 7px;
  border-radius: var(--radius-sm);
}

.work-state {
  color: var(--color-ink-mute);
}

/* 题材分类页 · 站内栏目索引（五列文字） */
.site-index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 20px;
}

.site-index-col {
  min-width: 0;
  padding-top: 14px;
  border-top: 2px solid var(--color-line-strong);
}

.site-index-name {
  font-size: 16px;
  font-weight: 700;
}

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

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

.site-index-note {
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--color-ink-mute);
}

/* ==========================================================================
   pages · 最近更新
   ========================================================================== */

.updates-board {
  margin-bottom: 52px;
}

.update-group {
  padding: 20px 0 6px;
  border-bottom: 1px solid var(--color-line);
}

.update-group .update-date {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-primary);
}

.update-group .update-list {
  margin-top: 14px;
  border-top: 0;
}

.update-group .update-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 6px 18px;
  padding: 12px 0;
  align-items: start;
}

.update-thumb {
  width: 92px;
  height: 62px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: #efe9ec;
}

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

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

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

.update-topic {
  display: inline-block;
  margin-top: 4px;
  padding: 1px 7px;
  font-size: 12.5px;
  color: var(--color-accent);
  background-color: var(--color-accent-soft);
  border-radius: var(--radius-sm);
}

.update-change {
  margin-top: 5px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--color-ink-mute);
}

.updates-footnote {
  margin-top: 18px;
  font-size: 14px;
  color: var(--color-ink-mute);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}

.updates-rule {
  margin-bottom: 52px;
}

.rule-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 30px;
  border-top: 1px solid var(--color-line);
  padding-top: 24px;
}

.rule-item {
  min-width: 0;
  padding-left: 16px;
  border-left: 3px solid var(--color-line-strong);
}

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

.rule-text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.rule-note {
  margin-top: 20px;
  font-size: 14px;
  color: var(--color-ink-mute);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}

/* 最近更新页 · 站内栏目索引（横排列表） */
.index-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

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

.index-list .index-item a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-card);
}

.index-list .index-item a:hover,
.index-list .index-item a:focus-visible {
  color: var(--color-primary-dark);
  border-color: var(--color-primary);
}

/* ==========================================================================
   pages · 人气榜单
   ========================================================================== */

.ranking-section {
  margin-bottom: 52px;
}

.ranking-list {
  border-top: 2px solid var(--color-ink);
}

.ranking-row {
  display: grid;
  grid-template-columns: 56px 96px minmax(0, 1fr);
  gap: 8px 20px;
  align-items: start;
  padding: 16px 4px;
  border-bottom: 1px solid var(--color-line);
  transition: background-color 0.18s ease;
}

.ranking-row:hover {
  background-color: #fdf1f6;
}

.rank-no {
  font-family: var(--font-num);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-accent);
}

.rank-thumb {
  width: 96px;
  height: 66px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: #efe9ec;
}

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

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

.ranking-row .rank-name {
  font-size: 18px;
  font-weight: 800;
}

.rank-meta {
  margin-top: 5px;
  font-size: 13px;
  color: var(--color-accent);
}

.ranking-row .rank-note {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.criteria-section {
  margin-bottom: 52px;
}

.criteria-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}

.criteria-card {
  min-width: 0;
  padding: 18px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius-card);
}

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

.criteria-text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

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

.criteria-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.figure-caption {
  padding: 11px 16px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--color-ink-mute);
  border-top: 1px solid var(--color-line);
}

.index-section {
  margin-bottom: 20px;
}

.index-section .index-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.index-section .index-item {
  padding: 14px 14px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
}

.index-section .index-item a {
  display: block;
  min-height: 26px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
}

.index-section .index-item a:hover,
.index-section .index-item a:focus-visible {
  color: var(--color-primary-dark);
}

.index-note {
  display: block;
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--color-ink-mute);
}

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

.field-figure {
  margin-bottom: 48px;
}

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

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

.field-figure-caption {
  padding: 11px 16px;
  font-size: 13.5px;
  color: var(--color-ink-mute);
  border-top: 1px solid var(--color-line);
}

.field-explain {
  margin-bottom: 52px;
}

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

.field-item {
  border-bottom: 1px solid var(--color-line);
}

.field-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  min-height: 44px;
  padding: 15px 4px;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.18s ease;
}

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

.field-summary:hover {
  background-color: #fdf1f6;
}

.field-summary .field-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-ink);
}

.field-hint {
  font-size: 13.5px;
  color: var(--color-ink-mute);
}

.field-item[open] .field-summary {
  background-color: #fdf1f6;
}

.field-item[open] .field-summary .field-name {
  color: var(--color-primary-dark);
}

.field-body {
  padding: 0 4px 18px;
}

.field-body p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--color-ink-soft);
  max-width: 88ch;
}

.scope-note {
  margin-bottom: 52px;
}

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

.scope-col {
  min-width: 0;
  padding: 20px 20px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
}

.scope-col-in {
  border-top: 3px solid var(--color-accent);
}

.scope-col-out {
  border-top: 3px solid var(--color-primary);
}

.scope-col-title {
  font-size: 17px;
  font-weight: 800;
  color: var(--color-ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-line);
}

.scope-list {
  margin-top: 14px;
}

.scope-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.scope-list li + li {
  margin-top: 9px;
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-line-strong);
}

.scope-col-in .scope-list li::before {
  background-color: var(--color-accent);
}

.scope-col-out .scope-list li::before {
  background-color: var(--color-primary);
}

/* 字段说明页 · 站内栏目索引（多列） */
.index-columns {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}

.index-columns .index-item {
  padding-top: 14px;
  border-top: 2px solid var(--color-line-strong);
}

.index-columns .index-item a {
  display: block;
  min-height: 26px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-ink);
}

.index-columns .index-item a:hover,
.index-columns .index-item a:focus-visible {
  color: var(--color-primary-dark);
}

/* ==========================================================================
   pages · 404
   ========================================================================== */

.error-main {
  max-width: var(--width-content);
  margin: 0 auto;
  padding: 0 24px 80px;
  width: 100%;
}

.error-block {
  padding: 72px 0 0;
}

.error-code {
  font-family: var(--font-num);
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}

.error-block h1 {
  margin-top: 16px;
  font-size: 34px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-ink);
}

.error-text {
  margin-top: 14px;
  font-size: 16px;
  color: var(--color-ink-soft);
  max-width: 62ch;
}

.error-hints {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px 24px;
}

.error-hints li {
  position: relative;
  padding-left: 16px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.error-hints li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.error-action {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 30px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  background-color: var(--color-primary);
  border-radius: var(--radius-card);
}

.error-action:hover,
.error-action:focus-visible {
  color: #ffffff;
  background-color: var(--color-primary-dark);
}

/* ==========================================================================
   responsive · 1024px
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding: 38px 24px 44px;
  }

  .hero-image {
    height: 260px;
  }

  .topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 26px;
  }

  .split-section {
    grid-template-columns: minmax(0, 1fr);
    gap: 44px;
  }

  .split-col-side {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--color-line);
    padding-top: 30px;
  }

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

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

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

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

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

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

/* ==========================================================================
   responsive · 768px
   ========================================================================== */

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

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 1 100%;
    justify-content: flex-start;
  }

  .nav-list {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 14px;
  }

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

  .nav-link {
    padding: 11px 8px;
    border-bottom: 1px solid var(--color-line);
    border-radius: 0;
  }

  .nav-link.is-current {
    border-bottom-color: var(--color-line);
    border-left: 3px solid var(--color-primary);
    padding-left: 12px;
  }

  .fact-bar-text {
    padding: 9px 18px;
    font-size: 13px;
  }

  .hero-inner {
    padding: 30px 18px 36px;
    gap: 26px;
  }

  .hero-title {
    font-size: 27px;
  }

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

  .hero-image {
    height: 210px;
  }

  .hero-cover img {
    height: 120px;
  }

  .hero-cover:last-child {
    transform: none;
  }

  .section {
    padding: 40px 18px 0;
  }

  .section:last-of-type {
    padding-bottom: 48px;
  }

  .section-title {
    font-size: 21px;
  }

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

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

  .cover-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 14px;
  }

  .cover-figure img {
    height: 146px;
  }

  .inner-main {
    padding: 0 18px 52px;
  }

  .breadcrumb {
    padding-top: 16px;
    font-size: 13px;
  }

  .page-header {
    padding: 20px 0 22px;
    margin-bottom: 30px;
  }

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

  .page-description {
    margin-top: 12px;
    font-size: 15px;
  }

  .topic-index-link {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 4px 14px;
    padding: 13px 2px;
  }

  .topic-index-note {
    grid-column: 2 / -1;
  }

  .topic-group {
    padding: 24px 0;
  }

  .topic-group-items {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

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

  .update-group .update-row {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 6px 14px;
  }

  .update-thumb {
    width: 76px;
    height: 54px;
  }

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

  .ranking-row {
    grid-template-columns: 40px 76px minmax(0, 1fr);
    gap: 8px 14px;
    padding: 14px 2px;
  }

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

  .rank-thumb {
    width: 76px;
    height: 56px;
  }

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

  .criteria-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

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

  .field-figure-media img {
    height: 210px;
  }

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

  .index-grid,
  .index-section .index-grid,
  .index-list,
  .index-columns,
  .site-index-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .error-main {
    padding: 0 18px 60px;
  }

  .error-block {
    padding-top: 48px;
  }

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

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

  .error-hints {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

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

  .footer-brand {
    grid-column: auto;
  }

  .footer-copy {
    padding: 0 18px 24px;
  }
}

/* ==========================================================================
   responsive · 480px
   ========================================================================== */

@media (max-width: 480px) {
  .brand-text {
    font-size: 19px;
  }

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

  .hero-summary {
    font-size: 15px;
  }

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

  .cover-figure img {
    height: 176px;
  }

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

  .work-cover img {
    height: 168px;
  }

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

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

  .ranking-row {
    grid-template-columns: 34px minmax(0, 1fr);
  }

  .rank-thumb {
    width: 100%;
    height: 150px;
    grid-column: 2 / -1;
  }

  .ranking-row .rank-body {
    grid-column: 2 / -1;
  }

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

  .update-thumb {
    width: 100%;
    height: 132px;
  }
}

/* ==========================================================================
   motion · 增强动效（不影响初始可见性）
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .cover-card,
  .work-card,
  .ranking-row,
  .cover-card:hover,
  .work-card:hover {
    will-change: transform;
  }

  .field-body {
    animation: field-reveal 0.22s ease-out;
  }
}

@keyframes field-reveal {
  from {
    opacity: 0.4;
  }
  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}