/* ==========================================================================
   jmtt 漫画专题阅读站 · 全站样式表
   sank3.com
   基础视觉：清晰编辑风，白底深字，克制强调色
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. BASE — 基础样式、变量、重置、排版
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #ffffff;
  --color-text: #1f2933;
  --color-text-secondary: #4a5568;
  --color-accent: #e94f37;
  --color-border: #e8ecef;
  --color-bg-soft: #f7f8fa;
  --color-bg-hover: #f1f3f5;
  --font-sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --container-width: 1200px;
  --content-width: 1080px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --header-height: 64px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 17px;
}

h4 {
  font-size: 15px;
}

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

time {
  font-variant-numeric: tabular-nums;
  color: var(--color-text-secondary);
  font-size: 13px;
}

/* 等宽数字 */
.rank-number,
.rank-num,
.step-num,
.step-number,
.pill-count,
.timeline-date {
  font-variant-numeric: tabular-nums;
}

/* 焦点可见性 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --------------------------------------------------------------------------
   2. LAYOUT — 全站骨架、容器、页头、页脚
   -------------------------------------------------------------------------- */

.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

.brand {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
  flex-shrink: 0;
  line-height: 1;
}

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

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-list a:hover {
  color: var(--color-text);
  background: var(--color-bg-hover);
}

.nav-list a.is-current {
  color: var(--color-accent);
  font-weight: 600;
  background: rgba(233, 79, 55, 0.06);
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle:hover {
  background: var(--color-bg-hover);
}

/* 主内容区 */
.site-main {
  flex: 1;
  width: 100%;
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--color-text-secondary);
}

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

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

.breadcrumb-sep {
  color: #a0aec0;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* 页脚 */
.site-footer {
  background: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
}

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

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

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

.footer-col a {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  max-width: var(--container-width);
  margin: 0 auto;
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   3. COMPONENTS — 通用组件
   -------------------------------------------------------------------------- */

/* 页面标题区（所有内页统一） */
.page-header {
  padding: 28px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 36px;
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 720px;
  line-height: 1.7;
}

.page-head {
  padding: 28px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 36px;
}

.page-desc,
.page-lead {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 720px;
  line-height: 1.7;
}

/* 章节标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  position: relative;
  padding-left: 14px;
  margin-bottom: 12px;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 3px;
  width: 4px;
  background: var(--color-accent);
  border-radius: 2px;
}

.section-desc,
.section-intro {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  max-width: 680px;
}

.section-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

/* 更多链接 */
.more-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  padding: 6px 0;
}

.more-link:hover {
  text-decoration: underline;
}

.more-link::after {
  content: '→';
  font-size: 14px;
}

/* 图片容器 */
figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-top: 8px;
}

.content-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-soft);
}

.content-media img {
  width: 100%;
  object-fit: cover;
}

.content-media-inline {
  margin-bottom: 20px;
}

/* 封面卡 */
.pick-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.pick-card:hover {
  box-shadow: 0 6px 20px rgba(31, 41, 51, 0.08);
  transform: translateY(-2px);
}

.pick-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* 步骤卡片 */
.step-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
}

.step-num,
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
}

.step-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 相关链接条 */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid var(--color-border);
  margin-top: 24px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-right: 4px;
}

.related-links-item {
  font-size: 14px;
  color: var(--color-accent);
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.related-links-item:hover {
  border-color: var(--color-accent);
  background: rgba(233, 79, 55, 0.04);
}

/* 网格布局通用 */
.topic-group-list,
.update-columns,
.guide-steps,
.steps-grid,
.terms-grid,
.feedback-grid,
.related-cards,
.pick-list {
  display: grid;
  gap: 24px;
}

/* --------------------------------------------------------------------------
   4. HOME — 首页模块
   -------------------------------------------------------------------------- */

/* 4.1 编辑头条区 */
.hero-section {
  padding: 36px 0 0;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.hero-main {
  display: flex;
  flex-direction: column;
}

.hero-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-soft);
  margin-bottom: 20px;
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.hero-figure figcaption {
  padding: 10px 16px;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.hero-content h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.3;
}

.hero-lead {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  max-width: 560px;
}

.btn-hero {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
  width: fit-content;
}

.btn-hero:hover {
  background: #d43f28;
  color: #fff;
}

/* 右侧双卡 */
.hero-aside {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.side-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  flex: 1;
}

.side-card h2 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.side-updates ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 12px;
}

.side-updates li {
  font-size: 14px;
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
  color: var(--color-text-secondary);
}

.side-updates li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.side-ranking ol {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 12px;
}

.side-ranking li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  line-height: 1.5;
}

.side-ranking li::before {
  content: attr(data-rank);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  min-width: 20px;
}

/* 4.2 定位条 */
.positioning-strip {
  background: var(--color-bg-soft);
  border-left: 4px solid var(--color-accent);
  padding: 16px 20px;
  margin: 36px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.positioning-strip p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.7;
}

/* 4.3 题材导航 */
.topics-module {
  padding: 0 0 48px;
}

.topics-module > .section-title {
  margin-bottom: 24px;
}

.topic-group-list {
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.topic-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.topic-item:hover {
  border-color: #d0d5da;
  box-shadow: 0 4px 12px rgba(31, 41, 51, 0.05);
}

.topic-tag {
  flex-shrink: 0;
  min-width: 72px;
}

.topic-tag a {
  display: inline-block;
  background: rgba(233, 79, 55, 0.08);
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
}

.topic-tag a:hover {
  background: rgba(233, 79, 55, 0.14);
}

.topic-sample {
  flex: 1;
  min-width: 0;
}

.topic-sample img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: 10px;
}

.topic-sample h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.topic-sample h3 a:hover {
  color: var(--color-accent);
}

.editor-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 4.4 最近更新 */
.updates-module {
  padding: 0 0 48px;
}

.updates-module > .section-title {
  margin-bottom: 24px;
}

.update-columns {
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 16px;
}

.update-col h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.update-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.update-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.update-list img {
  width: 72px;
  height: 48px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.update-list li div {
  min-width: 0;
}

.update-list li div a {
  display: block;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.5;
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.update-list li div a:hover {
  color: var(--color-accent);
}

.update-list li div span {
  font-size: 12px;
  color: var(--color-text-secondary);
  display: block;
  line-height: 1.5;
}

/* 4.5 人气榜单 */
.ranking-module {
  padding: 0 0 48px;
}

.ranking-module > .section-title {
  margin-bottom: 24px;
}

.ranking-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
}

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

.ranking-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.rank-num {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 28px;
}

.ranking-list li a {
  font-size: 15px;
  font-weight: 500;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.rank-tag {
  font-size: 12px;
  color: var(--color-text-secondary);
  background: var(--color-bg-soft);
  padding: 3px 10px;
  border-radius: 10px;
  flex-shrink: 0;
}

.ranking-picks {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ranking-picks .pick-card {
  display: flex;
  gap: 14px;
  padding: 12px;
}

.ranking-picks .pick-card img {
  width: 96px;
  height: 72px;
  aspect-ratio: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.ranking-picks .pick-card h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.ranking-picks .pick-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* 4.6 阅读指南 */
.guide-module {
  padding: 0 0 48px;
}

.guide-module > .section-title {
  margin-bottom: 24px;
}

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

.step-item {
  background: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: background var(--transition-fast);
}

.step-item:hover {
  background: var(--color-bg-hover);
}

.step-item .step-num {
  margin-bottom: 12px;
}

.step-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.step-item a {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

/* 4.7 反馈入口 */
.feedback-entry {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.feedback-entry p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.feedback-entry a {
  color: var(--color-accent);
  font-weight: 600;
  white-space: nowrap;
}

.feedback-entry a:hover {
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   5. INNER PAGES — 内页通用与专属模块
   -------------------------------------------------------------------------- */

/* 5.1 题材导航 topics.html */
.index-tabs {
  margin-bottom: 40px;
}

.index-tabs-inner {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.alpha-index {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.alpha-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.alpha-index ul {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.alpha-index a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 8px;
  font-size: 13px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.alpha-index a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.tag-index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-pill {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  border-radius: 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.tag-pill:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(233, 79, 55, 0.04);
}

/* 题材作品速览 */
.topic-groups {
  margin-bottom: 48px;
}

.topic-groups > .section-title {
  margin-bottom: 32px;
}

.topic-block {
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}

.topic-block:last-child {
  border-bottom: none;
}

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

.topic-head h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
}

.topic-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  max-width: 640px;
}

.topic-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 24px;
  align-items: start;
}

.topic-cover {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-soft);
}

.topic-cover img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.topic-cover figcaption {
  padding: 10px 14px;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.topic-works {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.work-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: border-color var(--transition-fast);
}

.work-card:hover {
  border-color: #d0d5da;
}

.work-info {
  margin-bottom: 6px;
}

.work-info a {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
}

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

.work-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-accent);
  background: rgba(233, 79, 55, 0.06);
  padding: 2px 10px;
  border-radius: 10px;
  margin-top: 4px;
}

.work-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 编辑选荐 */
.editors-pick {
  background: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 40px;
}

.editors-pick .section-title {
  margin-bottom: 8px;
}

.editors-pick .section-intro {
  margin-bottom: 24px;
}

.pick-list {
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.pick-list .pick-card {
  background: var(--color-bg);
}

.pick-info {
  padding: 14px 16px;
}

.pick-info h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.pick-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-accent);
  background: rgba(233, 79, 55, 0.06);
  padding: 2px 10px;
  border-radius: 10px;
  margin-bottom: 8px;
}

.pick-info p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 5.2 更新动态 updates.html */
.month-summary {
  margin-bottom: 40px;
}

.month-pills {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.month-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.month-pill:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pill-count {
  font-size: 12px;
  background: rgba(233, 79, 55, 0.1);
  color: var(--color-accent);
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}

.timeline {
  margin-bottom: 40px;
}

.timeline-group {
  margin-bottom: 32px;
  padding-left: 20px;
  border-left: 2px solid var(--color-border);
}

.timeline-month {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
  position: relative;
}

.timeline-month::before {
  content: '';
  position: absolute;
  left: -27px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
}

.timeline-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.timeline-thumb {
  width: 80px;
  height: 54px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

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

.timeline-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.5;
}

.timeline-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 4px;
}

.timeline-date {
  font-size: 12px;
  color: #a0aec0;
}

.tracking-tip {
  background: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.tracking-tip .section-title {
  margin-bottom: 12px;
}

.tracking-tip p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.tracking-tip a {
  color: var(--color-accent);
  font-weight: 500;
}

/* 5.3 人气榜单 ranking.html */
.rank-tabs {
  margin-bottom: 32px;
}

.tab-list {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0;
}

.tab-item {
  display: inline-block;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  transition: all var(--transition-fast);
}

.tab-item:hover {
  color: var(--color-text);
  background: var(--color-bg-soft);
}

.tab-item.is-active {
  color: var(--color-accent);
  font-weight: 600;
  background: var(--color-bg);
  border-color: var(--color-border);
  border-bottom: 2px solid var(--color-bg);
  margin-bottom: -1px;
  position: relative;
}

.tab-item.is-active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

.rank-list {
  margin-bottom: 40px;
}

.rank-list h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

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

.rank-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.rank-item:hover {
  background: var(--color-bg-soft);
}

.rank-number {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 36px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.rank-item:nth-child(n+4) .rank-number {
  color: var(--color-text-secondary);
}

.rank-thumb {
  width: 88px;
  height: 60px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

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

.rank-info h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.rank-tags {
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.rank-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.rank-note {
  background: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.rank-note p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* 5.4 阅读指南 guide.html */
.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 22px;
  margin-bottom: 8px;
  position: relative;
  padding-left: 14px;
}

.section-heading h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 3px;
  width: 4px;
  background: var(--color-accent);
  border-radius: 2px;
}

.section-heading p {
  font-size: 14px;
  color: var(--color-text-secondary);
  max-width: 680px;
}

.section-heading a {
  color: var(--color-accent);
  font-weight: 500;
}

.steps {
  margin-bottom: 48px;
}

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

.steps-grid .step-card {
  text-align: left;
}

.steps-grid .step-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.steps-grid .step-card a {
  display: inline-block;
  margin-top: 10px;
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

.terms {
  margin-bottom: 48px;
}

.terms-grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.term-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.term-card:hover {
  border-color: #d0d5da;
  box-shadow: 0 4px 12px rgba(31, 41, 51, 0.05);
}

.term-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.term-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.column-map {
  margin-bottom: 40px;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th {
  background: var(--color-bg-soft);
  font-weight: 600;
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
  white-space: nowrap;
}

td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  vertical-align: top;
  line-height: 1.6;
}

tr:last-child td {
  border-bottom: none;
}

.column-map-note {
  margin-top: 16px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.column-map-note a {
  color: var(--color-accent);
  font-weight: 500;
}

/* 5.5 术语表 terms.html */
.term-index {
  margin-bottom: 48px;
}

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

.term-index-group {
  background: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.term-index-group h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--color-text);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.term-index-group ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.term-index-group a {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 4px 0;
  display: inline-block;
}

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

.term-list {
  margin-bottom: 48px;
}

.term-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 16px;
  transition: border-color var(--transition-fast);
}

.term-item:hover {
  border-color: #d0d5da;
}

.term-text h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.term-text p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

.term-scene {
  font-size: 13px;
  color: var(--color-text-secondary);
  background: var(--color-bg-soft);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  line-height: 1.6;
}

.term-scene strong {
  color: var(--color-accent);
  font-weight: 600;
  margin-right: 4px;
}

.related-cards {
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.related-card:hover {
  border-color: #d0d5da;
  box-shadow: 0 4px 12px rgba(31, 41, 51, 0.05);
}

.related-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.related-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.related-card a {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.related-card a::after {
  content: '→';
}

/* 5.6 意见反馈 feedback.html */
.feedback-categories {
  margin-bottom: 48px;
}

.feedback-grid {
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.feedback-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.feedback-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition-fast);
}

.feedback-item summary:hover {
  background: var(--color-bg-soft);
}

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

.feedback-item summary::after {
  content: '+';
  font-size: 20px;
  color: var(--color-accent);
  transition: transform var(--transition-fast);
}

.feedback-item[open] summary::after {
  transform: rotate(45deg);
}

.feedback-detail {
  padding: 0 20px 20px;
}

.feedback-detail p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 8px;
}

.feedback-detail p:last-child {
  margin-bottom: 0;
}

.feedback-steps {
  margin-bottom: 48px;
}

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

.process {
  margin-bottom: 40px;
}

.process-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 32px;
  align-items: center;
  background: var(--color-bg-soft);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.process-text .section-title {
  margin-bottom: 16px;
}

.process-text p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.process-text p:last-child {
  margin-bottom: 0;
}

.process-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.process-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.process-media figcaption {
  padding: 8px 12px;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  font-size: 12px;
}

/* --------------------------------------------------------------------------
   6. ERROR — 404 页面
   -------------------------------------------------------------------------- */

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

.error-panel {
  text-align: center;
  max-width: 480px;
  padding: 48px 40px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.error-panel h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}

.error-back {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  padding: 12px 32px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.error-back:hover {
  background: #d43f28;
  color: #fff;
}

/* --------------------------------------------------------------------------
   7. RESPONSIVE — 响应式断点
   -------------------------------------------------------------------------- */

/* 桌面端 1200px 以下 */
@media (max-width: 1200px) {
  .topic-content {
    grid-template-columns: 1fr;
  }

  .topic-cover img {
    max-height: 240px;
  }
}

/* 平板 991px 断点 */
@media (max-width: 991px) {
  .header-inner {
    padding: 0 16px;
  }

  .home-main,
  .inner-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  /* 汉堡菜单 */
  .nav-toggle {
    display: flex;
    position: relative;
    z-index: 110;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 24px rgba(31, 41, 51, 0.08);
    z-index: 105;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
    padding: 12px 16px 20px;
  }

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

  .nav-list a {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: var(--radius-sm);
  }

  .nav-list a.is-current {
    background: rgba(233, 79, 55, 0.06);
  }

  /* 首页布局 */
  .hero-layout {
    grid-template-columns: 1fr;
  }

  .hero-aside {
    flex-direction: row;
  }

  .topic-group-list {
    grid-template-columns: 1fr;
  }

  .update-columns {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .ranking-layout {
    grid-template-columns: 1fr;
  }

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

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

  .term-index-lists {
    grid-template-columns: 1fr;
  }

  .related-cards {
    grid-template-columns: 1fr;
  }

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

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

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

/* 手机 640px 断点 */
@media (max-width: 640px) {
  .header-inner {
    height: 56px;
  }

  .brand {
    font-size: 20px;
  }

  .hero-section {
    padding-top: 24px;
  }

  .hero-content h1 {
    font-size: 24px;
  }

  .hero-aside {
    flex-direction: column;
  }

  .positioning-strip {
    margin: 24px 0;
    padding: 14px 16px;
  }

  .topics-module,
  .updates-module,
  .ranking-module,
  .guide-module {
    padding-bottom: 36px;
  }

  .topic-item {
    flex-direction: column;
    gap: 12px;
  }

  .topic-tag {
    min-width: auto;
  }

  .update-list img {
    width: 64px;
    height: 44px;
  }

  .ranking-picks .pick-card {
    flex-direction: column;
  }

  .ranking-picks .pick-card img {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .step-item {
    padding: 20px;
  }

  .feedback-entry {
    padding: 20px;
    flex-direction: column;
    align-items: flex-start;
  }

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

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

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

  .index-tabs-inner {
    padding: 16px;
  }

  .topic-block {
    margin-bottom: 32px;
    padding-bottom: 32px;
  }

  .editors-pick {
    padding: 20px;
  }

  .pick-list {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    flex-direction: column;
    gap: 10px;
  }

  .timeline-thumb {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
  }

  .rank-item {
    gap: 12px;
    padding: 12px 0;
  }

  .rank-number {
    font-size: 16px;
    min-width: 24px;
  }

  .rank-thumb {
    width: 72px;
    height: 50px;
  }

  .rank-info h3 {
    font-size: 14px;
  }

  .rank-desc {
    font-size: 12px;
  }

  .tab-item {
    padding: 8px 14px;
    font-size: 14px;
  }

  .table-wrap {
    border-radius: var(--radius-md);
  }

  th,
  td {
    padding: 10px 12px;
    font-size: 13px;
  }

  .term-item {
    padding: 16px;
  }

  .feedback-item summary {
    padding: 14px 16px;
  }

  .process-inner {
    padding: 20px;
  }

  .footer-cols {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 36px 16px 24px;
  }

  .footer-bottom {
    padding: 16px;
  }

  .error-panel {
    padding: 32px 24px;
  }

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

/* 超小屏 390px */
@media (max-width: 390px) {
  .header-inner {
    gap: 12px;
  }

  .nav-list a {
    font-size: 14px;
    padding: 10px 12px;
  }

  .hero-content h1 {
    font-size: 22px;
  }

  .btn-hero {
    width: 100%;
    justify-content: center;
  }

  .side-card {
    padding: 16px;
  }

  .topic-sample img {
    aspect-ratio: 16 / 9;
  }

  .update-list li {
    gap: 10px;
  }

  .update-list img {
    width: 56px;
    height: 40px;
  }

  .rank-num {
    font-size: 16px;
    min-width: 24px;
  }

  .rank-tag {
    font-size: 11px;
    padding: 2px 8px;
  }

  .step-card {
    padding: 18px;
  }

  .month-pill {
    padding: 8px 14px;
    font-size: 13px;
  }

  .timeline-group {
    padding-left: 14px;
  }

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

  .rank-thumb {
    width: 64px;
    height: 44px;
  }

  .rank-tabs {
    overflow-x: auto;
  }

  .tab-list {
    min-width: max-content;
  }

  .term-index-group {
    padding: 16px;
  }

  .related-card {
    padding: 16px;
  }

  .footer-col h4 {
    font-size: 13px;
  }

  .footer-col a {
    font-size: 13px;
  }
}

/* --------------------------------------------------------------------------
   8. MOTION — 动效增强（不阻塞初始可见性）
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  .section-title,
  .section-heading h2 {
    animation: fade-up 0.4s ease both;
  }

  @keyframes fade-up {
    from {
      opacity: 0.6;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}