/* ============================================================
   base — 全局基础
   ============================================================ */
:root {
  --color-ink: #1a1a1a;
  --color-paper: #faf7f2;
  --color-accent: #c44b3c;
  --color-blue: #3a5a78;
  --color-sand: #e8e2d7;
  --color-white: #ffffff;
  --color-muted: #6b6b6b;
  --color-line: #d9d2c6;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Consolas", "Liberation Mono",
    Menlo, monospace;
  --container-width: 1200px;
  --text-width: 920px;
  --radius: 6px;
  --header-h: 64px;
  --transition: 0.2s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-ink);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

p {
  margin-bottom: 1em;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   layout — 全站骨架
   ============================================================ */

/* 站点根容器 */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-home,
.site-inner {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
}

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

/* 页头 */
.site-header {
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--color-ink);
  letter-spacing: 0;
}

.brand-tag {
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

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

/* 主导航 */
.site-nav {
  display: block;
}

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

.nav-list a {
  display: inline-block;
  padding: 4px 0;
  font-size: 0.9375rem;
  color: var(--color-ink);
  position: relative;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition);
}

.nav-list a:hover::after,
.nav-list a.is-current::after {
  transform: scaleX(1);
}

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

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-ink);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* 页脚 */
.site-footer {
  background-color: var(--color-ink);
  color: #cfcfcf;
  margin-top: auto;
}

.footer-columns {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.footer-col h3 {
  font-size: 0.9375rem;
  color: var(--color-white);
  margin-bottom: 16px;
  font-weight: 700;
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul a {
  font-size: 0.875rem;
  color: #afafaf;
}

.footer-col ul a:hover {
  color: var(--color-white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: #8f8f8f;
  margin: 0;
}

/* ============================================================
   components — 通用组件
   ============================================================ */

/* 面包屑 */
.breadcrumb {
  max-width: var(--text-width);
  margin: 24px auto 0;
  padding: 0 24px;
  font-size: 0.875rem;
  color: var(--color-muted);
}

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

.breadcrumb-sep {
  margin: 0 8px;
  color: var(--color-line);
}

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

/* 页面标题区 */
.page-header {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 32px 24px 28px;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-description {
  font-size: 1rem;
  color: var(--color-muted);
  max-width: 70ch;
}

.content-media {
  margin: 20px 0;
}

.content-media-inline {
  display: flex;
  align-items: flex-start;
  gap: 20px;
}

.content-media-inline img {
  width: 180px;
  height: auto;
  border-radius: var(--radius);
  flex-shrink: 0;
}

.content-media-inline figcaption {
  font-size: 0.875rem;
  color: var(--color-muted);
  align-self: center;
}

/* 通用区块标题 */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.section-intro {
  color: var(--color-muted);
  margin-bottom: 28px;
  max-width: 70ch;
}

/* 热度条 */
.heat-bar {
  display: block;
  width: 120px;
  height: 6px;
  background-color: var(--color-sand);
  border-radius: 3px;
  overflow: hidden;
}

.heat-fill {
  display: block;
  height: 100%;
  background-color: var(--color-accent);
  border-radius: 3px;
}

.heat-fill-92,
.heat-fill-ninety-two {
  width: 92%;
}

.heat-fill-85 {
  width: 85%;
}

.heat-fill-78 {
  width: 78%;
}

.heat-fill-71 {
  width: 71%;
}

.heat-fill-64 {
  width: 64%;
}

.heat-fill-eighty-seven {
  width: 87%;
}

.heat-fill-eighty-one {
  width: 81%;
}

.heat-fill-seventy-five {
  width: 75%;
}

.heat-fill-sixty-eight {
  width: 68%;
}

/* ============================================================
   pages — 首页
   ============================================================ */

.home-main {
  width: 100%;
}

/* 首屏 hero */
.hero {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 48px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-copy p {
  color: var(--color-muted);
  font-size: 1.0625rem;
  max-width: 46ch;
  margin-bottom: 24px;
}

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

.tag-link {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 0.875rem;
  color: var(--color-ink);
  background-color: var(--color-white);
  transition: border-color var(--transition), color var(--transition),
    background-color var(--transition);
}

.tag-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: #fff;
}

.hero-figure {
  width: 100%;
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-line);
}

/* 主题介绍 */
.intro {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.intro-inner {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.intro-inner h2 {
  margin-bottom: 20px;
}

.intro-inner p {
  color: #444;
  margin-bottom: 1em;
}

/* 通用 section 容器 */
.recent-wall,
.ranking-summary,
.category-strip,
.guide-entry,
.copyright-strip {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 28px;
}

.section-head h2 {
  margin: 0;
}

.section-more {
  font-size: 0.875rem;
  color: var(--color-blue);
}

/* 最近更新封面墙 */
.cover-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.cover-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.cover-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.cover-card figure {
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

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

.cover-card h3 {
  padding: 14px 16px 4px;
  font-size: 1rem;
}

.cover-card h3 a {
  color: var(--color-ink);
}

.cover-card h3 a:hover {
  color: var(--color-accent);
}

.genre-tag {
  display: inline-block;
  margin: 0 16px 16px;
  padding: 2px 12px;
  background-color: var(--color-sand);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--color-blue);
}

/* 热读排行摘要 */
.ranking-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.ranking-item {
  display: grid;
  grid-template-columns: 40px 1fr 140px;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.rank-number {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
}

.rank-title {
  font-size: 1rem;
  color: var(--color-ink);
  font-weight: 600;
}

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

/* 题材分类索引条 */
.genre-group {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.genre-chip {
  display: inline-block;
  padding: 10px 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  font-size: 0.9375rem;
  color: var(--color-ink);
  transition: border-color var(--transition), color var(--transition),
    background-color var(--transition);
}

.genre-chip:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: #fff;
}

/* 阅读指南入口 */
.steps-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-item {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  border-top: 3px solid var(--color-accent);
}

.step-number {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.step-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

/* 版权与反馈 */
.copyright-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  border-top: 1px solid var(--color-line);
  margin-top: 16px;
}

.copyright-note h2,
.feedback-note h2 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.copyright-note p,
.feedback-note p {
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.feedback-note p a {
  color: var(--color-blue);
  text-decoration: underline;
}

/* ============================================================
   pages — 内页通用
   ============================================================ */

.inner-main {
  width: 100%;
  padding-bottom: 64px;
}

/* ============================================================
   pages — 题材分类页
   ============================================================ */

.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  align-items: start;
}

.category-list {
  min-width: 0;
}

.category-list > h2 {
  margin-bottom: 24px;
}

.category-group {
  margin-bottom: 40px;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.group-head {
  margin-bottom: 16px;
}

.group-head h3 {
  font-size: 1.125rem;
  margin-bottom: 6px;
}

.group-note {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

.group-covers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 12px;
}

.cover-item {
  width: 100%;
}

.cover-item img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-line);
}

.cover-item figcaption {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-top: 6px;
  text-align: center;
}

.group-reader {
  font-size: 0.875rem;
  color: var(--color-blue);
  margin: 0;
}

.category-more {
  display: flex;
  gap: 24px;
  padding: 8px 0 0;
}

.category-more a {
  font-size: 0.9375rem;
  color: var(--color-blue);
  text-decoration: underline;
}

/* 右侧术语栏 */
.term-block {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 24px;
  position: sticky;
  top: calc(var(--header-h) + 24px);
}

.term-block h2 {
  font-size: 1.125rem;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.term-item {
  margin-bottom: 20px;
}

.term-item h3 {
  font-size: 0.9375rem;
  font-family: var(--font-mono);
  color: var(--color-accent);
  margin-bottom: 6px;
}

.term-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

.term-link {
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
}

.term-link a {
  font-size: 0.875rem;
  color: var(--color-blue);
  text-decoration: underline;
}

/* ============================================================
   pages — 最近更新页
   ============================================================ */

.timeline-section,
.new-works-section,
.follow-tip-section {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.timeline-list {
  position: relative;
  padding-left: 24px;
  border-left: 2px solid var(--color-line);
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr) 120px;
  gap: 20px;
  align-items: start;
  padding: 0 0 32px 24px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 6px;
  width: 10px;
  height: 10px;
  background-color: var(--color-accent);
  border-radius: 50%;
  border: 2px solid var(--color-paper);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-muted);
  padding-top: 4px;
}

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

.timeline-title {
  font-size: 1rem;
  margin-bottom: 6px;
}

.timeline-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0 0 8px;
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  background-color: var(--color-sand);
  border-radius: 999px;
  font-size: 0.8125rem;
  color: var(--color-blue);
}

.timeline-figure {
  width: 100%;
}

.timeline-figure img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-line);
}

/* 新增作品 */
.new-works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.new-work-title {
  font-size: 1rem;
  margin-bottom: 8px;
}

.new-work-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.new-work-card a {
  font-size: 0.875rem;
  color: var(--color-blue);
  text-decoration: underline;
}

/* 追更提示 */
.follow-tip-section p {
  color: var(--color-muted);
}

.follow-tip-section p a {
  color: var(--color-blue);
  text-decoration: underline;
  margin-right: 16px;
}

/* ============================================================
   pages — 热读排行页
   ============================================================ */

.popular-list,
.trend-list {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.rank-item {
  display: grid;
  grid-template-columns: 44px 72px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.rank-number {
  font-family: var(--font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-accent);
}

.rank-cover {
  width: 72px;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--color-line);
}

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

.rank-title {
  font-size: 1rem;
  margin-bottom: 4px;
}

.rank-tag {
  display: inline-block;
  font-size: 0.8125rem;
  color: var(--color-blue);
  margin-bottom: 8px;
}

.rank-info .heat-bar {
  display: inline-block;
  vertical-align: middle;
  margin-right: 10px;
}

.heat-value {
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-family: var(--font-mono);
}

/* 趋势榜 */
.trend-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

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

.trend-rank {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
}

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

.trend-title {
  font-size: 1rem;
  display: inline-block;
  margin-right: 10px;
  margin-bottom: 4px;
}

.trend-change {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
}

.trend-change.up {
  color: var(--color-accent);
}

.trend-change.down {
  color: var(--color-blue);
}

.trend-desc {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0 0 4px;
}

.trend-count {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* 排行页底部引导 */
.guide-entry {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 32px 24px 48px;
  border-top: 1px solid var(--color-line);
}

.guide-entry h2 {
  margin-bottom: 12px;
}

.guide-entry p {
  color: var(--color-muted);
}

.guide-entry p a {
  color: var(--color-blue);
  text-decoration: underline;
}

/* ============================================================
   pages — 阅读指南页
   ============================================================ */

.device-guide,
.path-guide,
.faq,
.guide-links {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.device-item {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  border-top: 3px solid var(--color-blue);
}

.device-item h3 {
  font-size: 1rem;
  margin-bottom: 10px;
}

.device-item p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

/* 步骤条 */
.path-steps {
  counter-reset: path-step;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.path-steps li {
  position: relative;
  padding: 20px 24px 20px 72px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  list-style: none;
}

.step-num {
  position: absolute;
  left: 20px;
  top: 20px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  border-radius: 50%;
}

.path-steps h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.path-steps p {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

/* FAQ */
.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background-color: var(--color-white);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--color-accent);
  font-weight: 700;
}

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

/* 相关阅读 */
.guide-links {
  border-top: 1px solid var(--color-line);
  padding-top: 32px;
}

.guide-links h2 {
  font-size: 1.125rem;
  margin-bottom: 16px;
}

.guide-links ul li {
  margin-bottom: 8px;
}

.guide-links ul a {
  color: var(--color-blue);
  text-decoration: underline;
}

/* ============================================================
   pages — 版权与反馈页
   ============================================================ */

.boundary-section,
.process-section,
.feedback-section {
  max-width: var(--text-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.boundary-item {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  border-top: 3px solid var(--color-accent);
}

.boundary-item-title {
  font-size: 1rem;
  margin-bottom: 10px;
}

.boundary-item-text {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

/* 流程步骤 */
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.process-step {
  position: relative;
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.process-step .step-num {
  position: static;
  display: inline-flex;
  width: 36px;
  height: 36px;
  margin-bottom: 12px;
}

.step-title {
  font-size: 1rem;
  margin-bottom: 8px;
}

.step-text {
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0;
}

/* 反馈区 */
.feedback-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.feedback-col {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.feedback-col-title {
  font-size: 1rem;
  margin-bottom: 12px;
}

.feedback-col-text {
  font-size: 0.875rem;
  color: var(--color-muted);
}

.text-link {
  font-size: 0.875rem;
  color: var(--color-blue);
  text-decoration: underline;
}

/* ============================================================
   pages — 404
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1 0 auto;
}

.error-panel {
  max-width: 560px;
  width: 100%;
  text-align: center;
  padding: 48px 40px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 4rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1.2;
  margin-bottom: 16px;
}

.error-panel h1 {
  font-size: 1.375rem;
  margin-bottom: 12px;
}

.error-desc {
  color: var(--color-muted);
  font-size: 0.9375rem;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 16px;
}

.btn-back,
.btn-category {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: background-color var(--transition), color var(--transition),
    border-color var(--transition);
}

.btn-back {
  background-color: var(--color-accent);
  color: var(--color-white);
  border: 1px solid var(--color-accent);
}

.btn-back:hover {
  background-color: #b03e30;
  color: var(--color-white);
}

.btn-category {
  background-color: transparent;
  color: var(--color-ink);
  border: 1px solid var(--color-line);
}

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

.error-tip {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin: 0;
}

/* ============================================================
   responsive — 响应式
   ============================================================ */

@media (max-width: 1024px) {
  .cover-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .layout-shell {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 32px;
  }

  .footer-columns {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }
}

@media (max-width: 768px) {
  /* 页头 */
  .header-inner {
    padding: 0 16px;
    height: 56px;
    gap: 16px;
  }

  .brand-tag {
    display: none;
  }

  .nav-toggle {
    display: flex;
    order: 3;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-paper);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.06);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
  }

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

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

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

  .nav-list a {
    display: block;
    padding: 14px 8px;
    font-size: 1rem;
  }

  .nav-list a::after {
    display: none;
  }

  /* 首页 */
  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 32px;
  }

  .hero-copy h1 {
    font-size: 1.75rem;
  }

  .hero-figure img {
    aspect-ratio: 16 / 10;
  }

  .intro-inner {
    padding: 36px 16px;
  }

  .recent-wall,
  .ranking-summary,
  .category-strip,
  .guide-entry,
  .copyright-strip {
    padding: 36px 16px;
  }

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

  .ranking-item {
    grid-template-columns: 32px minmax(0, 1fr) 100px;
    gap: 12px;
  }

  .steps-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .copyright-strip {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  /* 内页 */
  .breadcrumb {
    padding: 0 16px;
  }

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

  .page-title {
    font-size: 1.625rem;
  }

  .layout-shell {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 0 16px;
  }

  .term-block {
    position: static;
  }

  .timeline-section,
  .new-works-section,
  .follow-tip-section,
  .popular-list,
  .trend-list,
  .device-guide,
  .path-guide,
  .faq,
  .guide-links,
  .boundary-section,
  .process-section,
  .feedback-section {
    padding: 0 16px 36px;
  }

  .timeline-item {
    grid-template-columns: 90px minmax(0, 1fr);
    gap: 12px;
    padding-left: 16px;
  }

  .timeline-figure {
    grid-column: 2;
    max-width: 120px;
  }

  .timeline-item::before {
    left: -25px;
  }

  .new-works-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .device-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .boundary-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .process-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feedback-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 页脚 */
  .footer-columns {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 36px 16px 24px;
  }

  .footer-bottom {
    padding: 16px;
  }
}

@media (max-width: 480px) {
  .cover-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .cover-card h3 {
    font-size: 0.875rem;
    padding: 10px 12px 2px;
  }

  .genre-tag {
    margin: 0 12px 12px;
    font-size: 0.75rem;
  }

  .steps-row {
    grid-template-columns: 1fr;
  }

  .ranking-item {
    grid-template-columns: 28px minmax(0, 1fr);
    gap: 10px;
  }

  .ranking-item .heat-bar {
    grid-column: 2;
    width: 100%;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .timeline-figure {
    grid-column: 1;
    max-width: 96px;
  }

  .group-covers {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .footer-columns {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .error-panel {
    padding: 36px 20px;
  }

  .error-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn-back,
  .btn-category {
    width: 100%;
    max-width: 240px;
  }
}

@media (max-width: 390px) {
  html {
    font-size: 15px;
  }

  .header-inner {
    padding: 0 12px;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .hero-copy h1 {
    font-size: 1.5rem;
  }

  .hero-tags {
    gap: 8px;
  }

  .tag-link {
    padding: 6px 14px;
    font-size: 0.8125rem;
  }

  .cover-grid {
    grid-template-columns: 1fr 1fr;
  }

  .cover-card h3 {
    font-size: 0.8125rem;
  }

  .genre-chip {
    padding: 8px 16px;
    font-size: 0.875rem;
  }

  .rank-item {
    grid-template-columns: 24px minmax(0, 1fr);
  }

  .rank-cover {
    width: 56px;
  }

  .rank-item {
    grid-template-columns: 32px 56px minmax(0, 1fr);
    gap: 10px;
  }

  .rank-info .heat-bar {
    width: 80px;
  }

  .timeline-list {
    padding-left: 16px;
  }

  .timeline-item {
    padding-left: 12px;
  }

  .timeline-item::before {
    left: -21px;
    width: 8px;
    height: 8px;
  }

  .timeline-date {
    font-size: 0.75rem;
  }

  .new-works-grid {
    grid-template-columns: 1fr;
  }

  .device-grid {
    grid-template-columns: 1fr;
  }

  .path-steps li {
    padding: 16px 16px 16px 60px;
  }

  .step-num {
    left: 14px;
    width: 32px;
    height: 32px;
    font-size: 0.875rem;
  }

  .process-steps {
    grid-template-columns: 1fr;
  }
}