/* ==========================================================================
   动漫天堂 ikgmk.cn — 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base — 变量、重置、排版基础
   -------------------------------------------------------------------------- */
:root {
  --bg: #ffffff;
  --ink: #1f2328;
  --ink-soft: #6b7280;
  --accent: #e0453a;
  --accent-dark: #c2352b;
  --line: #e5e7eb;
  --surface: #f7f7f8;
  --radius: 6px;
  --radius-sm: 4px;
  --content: 1120px;
  --gutter: 24px;
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

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

a {
  color: var(--ink);
  text-decoration: none;
}

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

h1,
h2,
h3,
h4 {
  margin: 0 0 12px;
  line-height: 1.35;
  font-weight: 700;
}

p {
  margin: 0 0 12px;
}

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

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

/* --------------------------------------------------------------------------
   layout — 全站骨架：页头 / 导航 / 主容器 / 面包屑 / 页脚
   -------------------------------------------------------------------------- */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--ink);
}

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

.header-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  flex: 0 0 auto;
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  padding: 8px 0;
}

.brand:hover {
  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-block;
  padding: 10px 14px;
  min-height: 44px;
  line-height: 24px;
  font-size: 15px;
  color: var(--ink);
  border-radius: var(--radius-sm);
}

.nav-list a:hover {
  color: var(--accent);
  background: var(--surface);
}

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

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
  position: relative;
}

.nav-toggle::before {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  top: 15px;
  height: 2px;
  background: var(--ink);
  box-shadow: 0 6px 0 var(--ink), 0 12px 0 var(--ink);
}

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

.home-main {
  display: block;
}

.inner-main {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter) 56px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 20px 0 4px;
  font-size: 14px;
  color: var(--ink-soft);
}

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

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

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

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

.page-header {
  padding: 12px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}

.page-description {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.site-footer {
  flex: 0 0 auto;
  border-top: 1px solid var(--line);
  background: var(--surface);
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 40px var(--gutter) 24px;
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: 28px 24px;
}

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

.footer-logo {
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ink);
}

.footer-desc {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
  max-width: 300px;
}

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

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
}

.footer-group ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.footer-group a:hover {
  color: var(--accent);
}

.footer-copy {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 var(--gutter) 32px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   components — 通用区块、卡片、列表、字段表、折叠问答
   -------------------------------------------------------------------------- */
.section {
  max-width: var(--content);
  margin: 0 auto;
  padding: 44px var(--gutter) 0;
}

.section-head {
  margin-bottom: 22px;
}

.section-head h2,
.section h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ink);
}

.section-desc,
.section-intro,
.section-lead {
  max-width: 720px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.section-more,
.section-foot,
.path-more,
.steps-foot {
  margin: 18px 0 0;
  font-size: 15px;
}

.section-more a,
.section-foot a,
.path-more a,
.steps-foot a {
  display: inline-block;
  color: var(--accent);
  font-weight: 600;
  padding: 4px 0;
}

.section-more a:hover,
.section-foot a:hover,
.path-more a:hover,
.steps-foot a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

.section-foot a + a,
.steps-foot a + a {
  margin-left: 18px;
}

/* 字段口径列表（genres / updates 共用 dl.field-list） */
.field-list {
  margin: 0;
  border-top: 1px solid var(--line);
}

.field-list .field-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.field-list dt {
  font-weight: 700;
  color: var(--ink);
}

.field-list dd {
  margin: 0;
  color: var(--ink-soft);
  min-width: 220px;
}

/* 字段口径对照表（guide） */
.field-table {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.field-table .field-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 16px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
}

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

.field-table .field-head {
  background: var(--surface);
  font-weight: 700;
}

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

.field-table .field-desc {
  color: var(--ink-soft);
  min-width: 220px;
}

/* 折叠问答 */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: var(--bg);
}

.faq-item summary {
  padding: 14px 44px 14px 18px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-size: 18px;
  line-height: 1;
}

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

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

.faq-item p {
  margin: 0;
  padding: 0 18px 16px;
  color: var(--ink-soft);
}

/* 滚动进入淡入（不影响初始可见性的增强） */
@media (prefers-reduced-motion: no-preference) {
  .js-reveal.is-visible {
    animation: reveal-up 0.45s ease-out both;
  }
}

@keyframes reveal-up {
  from {
    transform: translateY(10px);
  }
  to {
    transform: translateY(0);
  }
}

/* --------------------------------------------------------------------------
   pages — 首页
   -------------------------------------------------------------------------- */
.fact-bar {
  margin: 0;
  padding: 9px var(--gutter);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--ink-soft);
  text-align: center;
}

.hero {
  max-width: var(--content);
  margin: 0 auto;
  padding: 48px var(--gutter) 8px;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 40px;
  align-items: center;
}

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

.hero-title {
  font-size: 30px;
  font-weight: 700;
  margin: 0 0 14px;
  color: var(--ink);
}

.hero-lead {
  max-width: 520px;
  margin: 0 0 22px;
  color: var(--ink-soft);
  font-size: 16px;
}

.hero-paths {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-path {
  display: block;
}

.hero-path a {
  display: inline-block;
  min-height: 44px;
  padding: 10px 20px;
  line-height: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  background: var(--bg);
}

.hero-path:first-child a {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.hero-path a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.hero-path:first-child a:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #ffffff;
}

.hero-figure {
  margin: 0;
  min-width: 0;
}

.hero-figure img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--surface);
}

.hero-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--ink-soft);
}

/* 题材方向总览 */
.genre-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.genre-card {
  display: flex;
  flex-direction: column;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  min-width: 0;
}

.genre-card .genre-name {
  font-size: 17px;
  margin: 0 0 8px;
  color: var(--ink);
}

.genre-note {
  flex: 1 1 auto;
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--ink-soft);
}

.genre-link {
  align-self: flex-start;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  padding: 4px 0;
}

.genre-link:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

/* 封面条目墙 */
.cover-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.cover-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  min-width: 0;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.cover-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.cover-thumb {
  width: 100%;
  height: 210px;
  object-fit: cover;
  background: var(--surface);
}

.cover-card:nth-child(3n + 2) .cover-thumb {
  height: 240px;
}

.cover-card:nth-child(3n) .cover-thumb {
  height: 190px;
}

.cover-name {
  font-size: 16px;
  margin: 14px 16px 4px;
  color: var(--ink);
}

.cover-genre {
  margin: 0 16px 10px;
  font-size: 13px;
  color: var(--ink-soft);
}

.cover-link {
  margin: 0 16px 16px;
  align-self: flex-start;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  padding: 4px 0;
}

.cover-link:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

/* 更新记录 + 榜单速览 并列 */
.split-columns {
  max-width: var(--content);
  margin: 0 auto;
  padding: 44px var(--gutter) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.split-columns .section {
  max-width: none;
  margin: 0;
  padding: 0;
}

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

.update-row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 88px 84px;
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.update-date {
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
}

.update-name {
  color: var(--ink);
  font-weight: 600;
  min-width: 0;
}

.update-genre {
  color: var(--ink-soft);
}

.update-progress {
  color: var(--ink-soft);
  text-align: right;
}

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

.ranking-row {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.ranking-no {
  display: inline-block;
  width: 26px;
  height: 26px;
  line-height: 26px;
  text-align: center;
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink-soft);
  font-weight: 700;
  font-size: 13px;
}

.ranking-row:nth-child(1) .ranking-no,
.ranking-row:nth-child(2) .ranking-no,
.ranking-row:nth-child(3) .ranking-no {
  background: var(--accent);
  color: #ffffff;
}

.ranking-name {
  font-weight: 600;
  color: var(--ink);
}

.ranking-reason {
  display: block;
  color: var(--ink-soft);
  font-size: 13px;
  margin-top: 2px;
}

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

.index-col {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 0;
}

.index-title {
  font-size: 15px;
  margin: 0 0 8px;
  color: var(--ink);
}

.index-note {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--ink-soft);
}

.index-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  padding: 4px 0;
  display: inline-block;
}

.index-link:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   pages — 题材分类 genres.html
   -------------------------------------------------------------------------- */
.page-genres .genre-groups {
  margin-bottom: 44px;
}

.page-genres .genre-groups h2,
.page-genres .genre-visual h2,
.page-genres .field-spec h2,
.page-genres .read-path h2 {
  font-size: 22px;
  margin: 0 0 8px;
}

.page-genres .genre-groups .section-intro,
.page-genres .genre-visual .section-intro,
.page-genres .field-spec .section-intro,
.page-genres .read-path .section-intro {
  margin-bottom: 24px;
}

.genre-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 28px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.genre-block-info {
  min-width: 0;
}

.genre-block-info .genre-name {
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--ink);
}

.genre-trait {
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-size: 15px;
}

.genre-points {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.genre-points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  color: var(--ink-soft);
}

.genre-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.genre-block-list {
  min-width: 0;
}

.genre-sublabel {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
}

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

.entry-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
  min-width: 0;
}

.entry-list a {
  font-weight: 600;
  color: var(--ink);
}

.entry-list a:hover {
  color: var(--accent);
}

.entry-note {
  font-size: 13px;
  color: var(--ink-soft);
}

.genre-visual {
  margin-bottom: 44px;
}

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

.genre-figure {
  margin: 0;
  min-width: 0;
}

.genre-figure img {
  width: 100%;
  height: 190px;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--surface);
}

.genre-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

.field-spec {
  margin-bottom: 44px;
}

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

.path-step {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 0;
}

.path-step h3 {
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--ink);
}

.path-step p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages — 最近更新 updates.html
   -------------------------------------------------------------------------- */
.page-updates .updates-list-section {
  margin-bottom: 44px;
}

.page-updates .updates-list-section h2,
.page-updates .rhythm-section h2,
.page-updates .fields-section h2 {
  font-size: 22px;
  margin: 0 0 8px;
}

.page-updates .updates-list-section .section-lead,
.page-updates .rhythm-section p,
.page-updates .fields-section p {
  margin-bottom: 20px;
}

.update-group {
  border-top: 1px solid var(--line);
  padding-top: 18px;
  margin-bottom: 8px;
}

.update-group .update-date {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 10px;
}

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

.update-rows .update-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.update-thumb {
  margin: 0;
  width: 96px;
}

.update-thumb img {
  width: 96px;
  height: 68px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--surface);
}

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

.update-title {
  display: inline-block;
  font-weight: 600;
  color: var(--ink);
  font-size: 15px;
}

.update-title:hover {
  color: var(--accent);
}

.update-info .update-meta {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.rhythm-section {
  margin-bottom: 44px;
}

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

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

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

.fields-section {
  margin-bottom: 8px;
}

.fields-section .section-foot,
.rhythm-section .section-foot {
  margin-top: 16px;
}

/* --------------------------------------------------------------------------
   pages — 人气榜单 ranking.html
   -------------------------------------------------------------------------- */
.page-ranking .ranking-list-section {
  margin-bottom: 44px;
}

.page-ranking .ranking-list-section h2,
.page-ranking .rank-reason-section h2,
.page-ranking .rank-method-section h2 {
  font-size: 22px;
  margin: 0 0 8px;
}

.page-ranking .ranking-list-section .section-intro,
.page-ranking .rank-reason-section .section-intro,
.page-ranking .rank-method-section p {
  margin-bottom: 22px;
}

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

.ranking-item {
  display: grid;
  grid-template-columns: 48px 84px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.rank-number {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink-soft);
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.ranking-item:nth-child(1) .rank-number,
.ranking-item:nth-child(2) .rank-number,
.ranking-item:nth-child(3) .rank-number {
  color: var(--accent);
}

.rank-cover {
  margin: 0;
  width: 84px;
}

.rank-cover img {
  width: 84px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--surface);
}

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

.rank-name {
  font-size: 16px;
  margin: 0 0 4px;
}

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

.rank-name a:hover {
  color: var(--accent);
}

.rank-genre {
  margin: 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.rank-reason-section {
  margin-bottom: 44px;
}

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

.reason-row {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 0;
}

.reason-name {
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--ink);
}

.reason-text {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.rank-method-section {
  margin-bottom: 8px;
}

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

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

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

/* --------------------------------------------------------------------------
   pages — 阅读说明 guide.html
   -------------------------------------------------------------------------- */
.page-guide .guide-steps {
  margin-bottom: 44px;
}

.page-guide .guide-steps h2,
.page-guide .field-glossary h2,
.page-guide .boundary h2,
.page-guide .faq h2 {
  font-size: 22px;
  margin: 0 0 8px;
}

.page-guide .guide-steps .section-intro,
.page-guide .field-glossary .section-intro,
.page-guide .boundary .section-intro,
.page-guide .faq .section-intro {
  margin-bottom: 22px;
}

.guide-figure {
  margin: 0 0 24px;
}

.guide-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--surface);
}

.guide-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

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

.step-item {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  min-width: 0;
}

.step-index {
  display: inline-block;
  width: 28px;
  height: 28px;
  line-height: 28px;
  text-align: center;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 10px;
}

.step-item h3 {
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--ink);
}

.step-item p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.step-item p a {
  color: var(--accent);
  font-weight: 600;
}

.step-item p a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

.field-glossary {
  margin-bottom: 44px;
}

.boundary {
  margin-bottom: 44px;
}

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

.boundary-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  min-width: 0;
}

.boundary-item h3 {
  font-size: 16px;
  margin: 0 0 8px;
  color: var(--ink);
}

.boundary-item p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.faq {
  margin-bottom: 8px;
}

/* --------------------------------------------------------------------------
   pages — 404
   -------------------------------------------------------------------------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px var(--gutter);
}

.error-panel {
  max-width: 640px;
  width: 100%;
  text-align: center;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 8px;
  line-height: 1;
}

.error-panel h1 {
  font-size: 26px;
  margin: 0 0 12px;
  color: var(--ink);
}

.error-text {
  margin: 0 0 24px;
  color: var(--ink-soft);
  font-size: 15px;
}

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

.error-actions li {
  display: block;
}

.error-btn {
  display: inline-block;
  min-height: 44px;
  padding: 10px 20px;
  line-height: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  background: var(--bg);
}

.error-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.error-actions li:first-child .error-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.error-actions li:first-child .error-btn:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   responsive — 1024px 断点
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 28px;
  }

  .hero-figure img {
    height: 300px;
  }

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

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

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

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

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

/* --------------------------------------------------------------------------
   responsive — 768px 断点
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --gutter: 20px;
  }

  body {
    font-size: 15px;
    line-height: 1.7;
  }

  .header-inner {
    min-height: 58px;
    gap: 12px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 8px var(--gutter) 14px;
    margin-left: 0;
  }

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

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

  .nav-list a {
    display: block;
    padding: 12px 10px;
    font-size: 16px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-top: 32px;
  }

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

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

  .page-title {
    font-size: 23px;
  }

  .section {
    padding-top: 34px;
  }

  .section-head h2,
  .section h2,
  .page-genres .genre-groups h2,
  .page-genres .genre-visual h2,
  .page-genres .field-spec h2,
  .page-genres .read-path h2,
  .page-updates .updates-list-section h2,
  .page-updates .rhythm-section h2,
  .page-updates .fields-section h2,
  .page-ranking .ranking-list-section h2,
  .page-ranking .rank-reason-section h2,
  .page-ranking .rank-method-section h2,
  .page-guide .guide-steps h2,
  .page-guide .field-glossary h2,
  .page-guide .boundary h2,
  .page-guide .faq h2 {
    font-size: 20px;
  }

  .genre-grid,
  .cover-grid,
  .index-columns,
  .genre-visual-grid,
  .path-steps,
  .step-list,
  .reason-grid,
  .boundary-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cover-card:nth-child(3n + 2) .cover-thumb,
  .cover-card:nth-child(3n) .cover-thumb {
    height: 200px;
  }

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

  .update-row {
    grid-template-columns: 58px minmax(0, 1fr) 84px;
  }

  .update-progress {
    grid-column: 2 / -1;
    text-align: left;
  }

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

  .field-list .field-row,
  .field-table .field-row {
    grid-template-columns: 140px 1fr;
    gap: 12px;
  }

  .ranking-item {
    grid-template-columns: 36px 72px minmax(0, 1fr);
    gap: 12px;
  }

  .rank-cover,
  .rank-cover img {
    width: 72px;
  }

  .rank-cover img {
    height: 54px;
  }

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

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

/* --------------------------------------------------------------------------
   responsive — 520px 断点（覆盖 390px 手机）
   -------------------------------------------------------------------------- */
@media (max-width: 520px) {
  .fact-bar {
    font-size: 12px;
    text-align: left;
    padding: 8px var(--gutter);
  }

  .hero-paths {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-path a {
    display: block;
    text-align: center;
  }

  .genre-grid,
  .cover-grid,
  .index-columns,
  .genre-visual-grid,
  .path-steps,
  .step-list,
  .reason-grid,
  .boundary-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .cover-thumb,
  .cover-card:nth-child(3n + 2) .cover-thumb,
  .cover-card:nth-child(3n) .cover-thumb {
    height: 220px;
  }

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

  .update-genre,
  .update-progress {
    grid-column: 2 / -1;
    text-align: left;
  }

  .update-rows .update-row {
    grid-template-columns: 80px minmax(0, 1fr);
    gap: 12px;
  }

  .update-thumb,
  .update-thumb img {
    width: 80px;
  }

  .update-thumb img {
    height: 58px;
  }

  .ranking-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 10px;
  }

  .rank-cover {
    grid-column: 2;
    width: 72px;
  }

  .rank-cover img {
    width: 72px;
    height: 54px;
  }

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

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

  .field-list dd,
  .field-table .field-desc {
    min-width: 0;
  }

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

  .error-code {
    font-size: 52px;
  }

  .error-actions {
    flex-direction: column;
  }

  .error-btn {
    display: block;
    text-align: center;
  }
}