/* ============================================================
   base — 基础变量、reset、全局字体与颜色
   ============================================================ */
:root {
  --bg: #FAF8F5;
  --text: #26241F;
  --accent: #B4572E;
  --accent-dark: #93431F;
  --accent-light: #F3E7DC;
  --secondary: #6B675E;
  --line: #E5E0D8;
  --green: #3E6B5A;
  --white: #FFFFFF;
  --container: 1160px;
  --content: 880px;
  --radius: 8px;
  --shadow: 0 1px 4px rgba(38, 36, 31, 0.06);
  --serif: Georgia, "Songti SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

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

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

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

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 2.125rem;
  font-weight: 700;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
}

h3 {
  font-size: 1.125rem;
  font-weight: 700;
}

h4 {
  font-size: 1rem;
  font-weight: 700;
}

p {
  margin-bottom: 1rem;
}

/* ============================================================
   layout — 全站共用布局骨架
   ============================================================ */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-family: var(--serif);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0;
  white-space: nowrap;
}

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

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

.site-nav .nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 0.9375rem;
  color: var(--text);
  border-radius: var(--radius);
  transition: background 0.2s ease, color 0.2s ease;
}

.site-nav .nav-list li a:hover {
  background: var(--accent-light);
  color: var(--accent-dark);
}

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

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

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.site-footer {
  background: var(--text);
  color: rgba(255, 255, 255, 0.85);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 56px 24px 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.footer-col h4 {
  color: var(--white);
  margin-bottom: 16px;
  font-size: 1rem;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 24px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  margin: 0;
}

.footer-boundary {
  grid-column: 1 / -1;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.65;
  margin-top: 8px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

/* ============================================================
   components — 通用组件
   ============================================================ */
/* 面包屑 */
.breadcrumb {
  padding: 24px 0 8px;
  font-size: 0.875rem;
  color: var(--secondary);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

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

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

.breadcrumb-sep {
  color: var(--secondary);
  opacity: 0.6;
}

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

/* 内页标题区 */
.page-header {
  padding: 32px 0 40px;
  max-width: var(--content);
}

.page-title {
  font-size: 2rem;
  margin-bottom: 16px;
}

.page-description {
  font-size: 1.0625rem;
  color: var(--secondary);
  max-width: 640px;
  line-height: 1.7;
}

/* 内页主图 */
.page-hero-figure,
.page-hero-media,
.page-hero-image,
.page-hero-img,
.page-media {
  margin: 0 0 48px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

.page-hero-figure img,
.page-hero-media img,
.page-hero-image img,
.page-hero-img img,
.page-media img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.page-hero-figure figcaption,
.page-hero-media figcaption,
.page-hero-image figcaption,
.page-hero-img figcaption,
.page-media figcaption {
  padding: 12px 20px;
  font-size: 0.875rem;
  color: var(--secondary);
  background: var(--white);
  border-top: 1px solid var(--line);
}

/* 相关阅读 */
.related-section,
.related-reading {
  padding: 48px 0;
}

.related-section h2,
.related-reading h2 {
  margin-bottom: 24px;
}

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

.related-card {
  display: block;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.related-card h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
  color: var(--text);
}

.related-card p {
  font-size: 0.875rem;
  color: var(--secondary);
  margin: 0;
  line-height: 1.6;
}

.related-links {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.related-links-label {
  font-size: 0.875rem;
  color: var(--secondary);
}

.related-links-item {
  font-size: 0.875rem;
}

/* 检查清单 */
.check-list {
  list-style: none;
  padding: 0;
}

.check-list li {
  position: relative;
  padding: 12px 0 12px 32px;
  border-bottom: 1px solid var(--line);
  font-size: 0.9375rem;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 18px;
  height: 18px;
  border: 2px solid var(--green);
  border-radius: 4px;
  background: var(--white);
}

.checklist {
  list-style: none;
}

.checklist li {
  position: relative;
  padding: 12px 0 12px 32px;
  border-bottom: 1px solid var(--line);
  font-size: 0.9375rem;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 18px;
  height: 18px;
  border: 2px solid var(--green);
  border-radius: 4px;
  background: var(--white);
}

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

.faq-item summary {
  padding: 18px 48px 18px 24px;
  font-family: var(--serif);
  font-size: 1.0625rem;
  font-weight: 700;
  cursor: pointer;
  position: relative;
  list-style: none;
  user-select: none;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
  color: var(--accent);
  font-weight: 400;
  font-family: var(--sans);
}

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

.faq-item[open] summary {
  border-bottom: 1px solid var(--line);
}

.faq-answer {
  padding: 16px 24px 20px;
}

.faq-answer p {
  font-size: 0.9375rem;
  margin: 0;
  color: var(--text);
}

/* ============================================================
   pages — 首页
   ============================================================ */
.home-main {
  padding-bottom: 40px;
}

/* 双通道首屏 */
.hero-section {
  padding: 56px 0 48px;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: center;
}

.hero-start h1 {
  font-size: 2.375rem;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 1.0625rem;
  color: var(--secondary);
  margin-bottom: 32px;
}

.hero-steps {
  padding: 0;
  list-style: none;
}

.hero-steps li {
  position: relative;
  padding: 0 0 24px 44px;
  counter-increment: step;
}

.hero-steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--white);
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-steps {
  counter-reset: step;
}

.hero-steps li strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.0625rem;
  margin-bottom: 4px;
}

.hero-steps li {
  color: var(--secondary);
  font-size: 0.9375rem;
}

.hero-media {
  margin: 0;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

.hero-media img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.hero-links {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 20px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-entry {
  display: inline-block;
  padding: 10px 20px;
  background: var(--text);
  color: var(--white);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.2s ease;
}

.hero-entry:hover {
  background: var(--accent);
  color: var(--white);
}

/* 站点数据条 */
.stats-bar {
  background: var(--text);
  border-radius: var(--radius);
  padding: 32px 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.stat-item {
  text-align: center;
}

.stat-num {
  display: block;
  font-family: var(--serif);
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
}

/* 题材方向行式目录 */
.subjects-directory {
  margin-bottom: 64px;
}

.subjects-directory h2 {
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.subjects-directory > h2 + p {
  color: var(--secondary);
  margin-bottom: 32px;
}

.subject-row {
  display: grid;
  grid-template-columns: 180px 1fr 140px;
  gap: 24px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.subject-row:first-of-type {
  border-top: 1px solid var(--line);
}

.subject-name {
  font-family: var(--serif);
  font-size: 1.125rem;
  font-weight: 700;
}

.subject-desc {
  font-size: 0.9375rem;
  color: var(--secondary);
  margin: 0;
}

.subject-link {
  font-size: 0.875rem;
  font-weight: 500;
  text-align: right;
}

/* 本期焦点 */
.featured-spotlight {
  margin-bottom: 64px;
}

.featured-spotlight h2 {
  font-size: 1.75rem;
  margin-bottom: 32px;
}

.featured-block {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.featured-media {
  margin: 0;
  background: var(--line);
}

.featured-media img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
}

.featured-info {
  padding: 40px 40px 40px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.featured-topic {
  font-family: var(--serif);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 16px;
}

.featured-reason {
  font-size: 0.9375rem;
  color: var(--text);
  margin-bottom: 12px;
}

.featured-audience {
  font-size: 0.875rem;
  color: var(--secondary);
  margin-bottom: 24px;
}

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

.featured-actions a {
  display: inline-block;
  padding: 10px 20px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
}

.featured-actions a:first-child {
  background: var(--accent);
  color: var(--white);
}

.featured-actions a:first-child:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--white);
}

.featured-actions a:last-child {
  color: var(--accent);
}

.featured-actions a:last-child:hover {
  background: var(--accent-light);
}

/* 热门漫画更新时间线 */
.updates-timeline {
  margin-bottom: 64px;
}

.updates-timeline h2 {
  font-size: 1.75rem;
  margin-bottom: 32px;
}

.update-item {
  position: relative;
  padding: 24px 24px 24px 120px;
  border-bottom: 1px solid var(--line);
}

.update-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
}

.update-type {
  position: absolute;
  left: 28px;
  top: 24px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  padding: 4px 12px;
  border-radius: 4px;
}

.update-summary {
  font-size: 0.9375rem;
  margin: 0;
  color: var(--text);
}

.update-status {
  display: inline-block;
  font-size: 0.8125rem;
  color: var(--green);
  margin-top: 8px;
  font-weight: 500;
}

/* 观看场景入口 */
.scenes-entry {
  margin-bottom: 64px;
}

.scenes-entry h2 {
  font-size: 1.75rem;
  margin-bottom: 32px;
}

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

.scene-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.scene-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.scene-card h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.scene-card p {
  font-size: 0.875rem;
  color: var(--secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.scene-card a {
  font-size: 0.875rem;
  font-weight: 500;
}

/* 推荐流程摘要 */
.process-summary {
  margin-bottom: 64px;
}

.process-summary h2 {
  font-size: 1.75rem;
  margin-bottom: 32px;
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

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

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--white);
  font-family: var(--serif);
  font-weight: 700;
  margin-bottom: 12px;
}

.process-link {
  display: inline-block;
  padding: 10px 24px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--accent);
}

.process-link:hover {
  background: var(--accent);
  color: var(--white);
}

/* 正版阅读指南入口 */
.guide-entry {
  background: var(--accent-light);
  border-radius: var(--radius);
  padding: 48px;
  margin-bottom: 64px;
}

.guide-entry h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.guide-entry p {
  color: var(--secondary);
  max-width: 720px;
  margin-bottom: 24px;
}

.guide-action {
  display: inline-block;
  padding: 12px 28px;
  background: var(--accent);
  color: var(--white);
  border-radius: var(--radius);
  font-weight: 500;
  transition: background 0.2s ease;
}

.guide-action:hover {
  background: var(--accent-dark);
  color: var(--white);
}

/* 常见问题摘选 */
.faq-highlights {
  margin-bottom: 32px;
}

.faq-highlights h2 {
  font-size: 1.75rem;
  margin-bottom: 24px;
}

.faq-more {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.9375rem;
  font-weight: 500;
}

/* ============================================================
   pages — 内页共用
   ============================================================ */
.inner-main {
  padding-bottom: 48px;
}

.inner-main .breadcrumb {
  max-width: var(--content);
}

.inner-main .page-header {
  max-width: var(--content);
}

.inner-main > .page-hero-figure,
.inner-main > .page-hero-media,
.inner-main > .page-hero-image,
.inner-main > .page-hero-img,
.inner-main > .page-media {
  max-width: var(--content);
}

/* 通用内容区块 */
.content-section,
.method-section,
.subject-list-section,
.check-section,
.boundary-section,
.process-overview,
.process-steps,
.process-example,
.process-terms,
.process-boundary,
.content-block,
.observe-section,
.faq-group {
  max-width: var(--content);
  margin-bottom: 48px;
}

.content-section h2,
.method-section h2,
.subject-list-section h2,
.check-section h2,
.boundary-section h2,
.process-overview h2,
.process-steps h2,
.process-example h2,
.process-terms h2,
.process-boundary h2,
.content-block h2,
.observe-section h2,
.faq-group h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.section-title {
  font-size: 1.5rem;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.section-body p {
  margin-bottom: 16px;
}

/* ============================================================
   pages — 题材方向
   ============================================================ */
.subject-item {
  padding: 32px 0;
  border-bottom: 1px solid var(--line);
}

.subject-item h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.subject-def {
  font-size: 1rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 12px;
}

.subject-detail p {
  font-size: 0.9375rem;
  margin-bottom: 8px;
  color: var(--text);
}

/* ============================================================
   pages — 观看场景
   ============================================================ */
.scene-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.scene-item-alt .scene-media {
  order: 2;
}

.scene-item-alt .scene-content {
  order: 1;
}

.scene-media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--line);
}

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

.scene-content h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.scene-time {
  font-size: 0.8125rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 12px;
}

.scene-content p {
  font-size: 0.9375rem;
  color: var(--secondary);
  margin-bottom: 8px;
}

.scene-link {
  margin-top: 12px;
}

.scene-link a {
  font-size: 0.875rem;
  font-weight: 500;
}

/* ============================================================
   pages — 推荐流程
   ============================================================ */
.steps-list .step-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--white);
  font-family: var(--serif);
  font-size: 1.375rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-content h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 0.9375rem;
  margin-bottom: 8px;
}

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

.terms-list .term-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 16px;
}

.term-item dt {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1rem;
}

.term-item dd {
  font-size: 0.9375rem;
  color: var(--secondary);
  margin: 0;
}

.related-list {
  max-width: var(--content);
}

.related-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.related-list li a {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* ============================================================
   pages — 正版阅读指南
   ============================================================ */
.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.detail-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.detail-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--accent);
}

.detail-item p {
  font-size: 0.875rem;
  color: var(--secondary);
  margin: 0;
  line-height: 1.6;
}

/* ============================================================
   pages — 内容观察
   ============================================================ */
.section-intro {
  font-size: 0.9375rem;
  color: var(--secondary);
  margin-bottom: 24px;
}

.timeline-list .timeline-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
}

.timeline-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.update-type {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  padding: 4px 12px;
  border-radius: 4px;
  display: inline-block;
  width: fit-content;
}

.update-status {
  font-size: 0.8125rem;
  font-weight: 500;
}

.status-active {
  color: var(--green);
}

.status-done {
  color: var(--secondary);
}

.status-hold {
  color: var(--accent);
}

.timeline-body h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.timeline-body p {
  font-size: 0.875rem;
  color: var(--secondary);
  margin: 0;
  line-height: 1.6;
}

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

.observe-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.observe-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.observe-card p {
  font-size: 0.875rem;
  color: var(--secondary);
  margin: 0;
  line-height: 1.6;
}

.note-section p {
  font-size: 0.9375rem;
  color: var(--secondary);
}

.note-section p a {
  font-weight: 500;
}

/* ============================================================
   pages — 常见问题
   ============================================================ */
.faq-group {
  margin-bottom: 40px;
}

.faq-group h2 {
  font-size: 1.375rem;
}

.faq-list .faq-item {
  margin-bottom: 12px;
}

/* ============================================================
   pages — 404
   ============================================================ */
.error-main {
  min-height: calc(100vh - 72px - 300px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-section {
  padding: 80px 24px;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.error-code {
  font-family: var(--serif);
  font-size: 5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.error-desc {
  color: var(--secondary);
  margin-bottom: 32px;
}

.error-btn {
  display: inline-block;
  padding: 12px 32px;
  background: var(--accent);
  color: var(--white);
  border-radius: var(--radius);
  font-weight: 500;
  transition: background 0.2s ease;
}

.error-btn:hover {
  background: var(--accent-dark);
  color: var(--white);
}

/* ============================================================
   responsive — 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .header-inner {
    padding: 0 20px;
  }

  .site-main {
    padding: 0 20px;
  }

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

  .hero-media img {
    height: 360px;
  }

  .featured-block {
    grid-template-columns: 1fr;
  }

  .featured-info {
    padding: 32px;
  }

  .scenes-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

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

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

  .related-grid,
  .related-cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px;
    gap: 0;
  }

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

  .site-nav .nav-list li a {
    padding: 14px 16px;
    border-radius: var(--radius);
    font-size: 1rem;
  }

  .site-nav .nav-list li a.is-current {
    background: var(--accent-light);
    color: var(--accent-dark);
  }

  .hero-section {
    padding: 40px 0 32px;
  }

  .hero-start h1 {
    font-size: 1.875rem;
  }

  .hero-media img {
    height: 280px;
  }

  .stats-bar {
    padding: 24px;
  }

  .stat-num {
    font-size: 1.75rem;
  }

  .subject-row {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 16px 0;
  }

  .subject-link {
    text-align: left;
  }

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

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

  .update-item {
    padding: 20px 0 20px 24px;
  }

  .update-type {
    position: static;
    display: inline-block;
    margin-bottom: 8px;
  }

  .update-item::before {
    left: 0;
  }

  .scene-item,
  .scene-item-alt {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .scene-item-alt .scene-media,
  .scene-item-alt .scene-content {
    order: initial;
  }

  .scene-media img {
    height: 220px;
  }

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

  .timeline-list .timeline-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

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

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

  .terms-list .term-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 20px 24px;
  }

  .footer-boundary {
    grid-column: 1;
  }

  .guide-entry {
    padding: 32px 24px;
  }

  .page-header {
    padding: 24px 0 32px;
  }

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

  .page-hero-figure img,
  .page-hero-media img,
  .page-hero-image img,
  .page-hero-img img,
  .page-media img {
    height: 220px;
  }

  .steps-list .step-item {
    grid-template-columns: 56px 1fr;
    gap: 16px;
  }

  .step-number {
    width: 44px;
    height: 44px;
    font-size: 1.125rem;
  }

  .faq-item summary {
    padding: 16px 44px 16px 20px;
    font-size: 1rem;
  }

  .faq-answer {
    padding: 14px 20px 16px;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  .header-inner {
    padding: 0 16px;
  }

  .brand {
    font-size: 1.125rem;
  }

  .site-main {
    padding: 0 16px;
  }

  .hero-start h1 {
    font-size: 1.625rem;
  }

  .hero-lead {
    font-size: 0.9375rem;
  }

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

  .hero-links {
    left: 12px;
    right: 12px;
    bottom: 12px;
    gap: 8px;
  }

  .hero-entry {
    padding: 8px 16px;
    font-size: 0.8125rem;
  }

  .stats-bar {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 24px 16px;
  }

  .stat-item {
    text-align: left;
    display: flex;
    align-items: baseline;
    gap: 12px;
  }

  .stat-num {
    font-size: 1.5rem;
    margin: 0;
  }

  .stat-label {
    font-size: 0.8125rem;
  }

  .subjects-directory h2,
  .featured-spotlight h2,
  .updates-timeline h2,
  .scenes-entry h2,
  .process-summary h2,
  .faq-highlights h2 {
    font-size: 1.375rem;
  }

  .featured-info {
    padding: 24px 20px;
  }

  .featured-topic {
    font-size: 1.125rem;
  }

  .featured-media img {
    min-height: 220px;
  }

  .featured-actions a {
    padding: 8px 16px;
    font-size: 0.8125rem;
  }

  .guide-entry {
    padding: 28px 20px;
  }

  .guide-entry h2 {
    font-size: 1.25rem;
  }

  .guide-action {
    padding: 10px 20px;
    font-size: 0.875rem;
  }

  .scene-card {
    padding: 20px;
  }

  .process-steps li {
    padding: 20px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .page-description {
    font-size: 0.9375rem;
  }

  .breadcrumb {
    padding: 16px 0 4px;
    font-size: 0.8125rem;
  }

  .page-hero-figure img,
  .page-hero-media img,
  .page-hero-image img,
  .page-hero-img img,
  .page-media img {
    height: 180px;
  }

  .subject-item {
    padding: 24px 0;
  }

  .subject-item h3 {
    font-size: 1.125rem;
  }

  .subject-detail p {
    font-size: 0.875rem;
  }

  .steps-list .step-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .step-number {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .detail-item {
    padding: 20px;
  }

  .timeline-list .timeline-item {
    padding: 20px 0;
  }

  .observe-card {
    padding: 20px;
  }

  .related-card {
    padding: 20px;
  }

  .error-code {
    font-size: 3.5rem;
  }

  .error-section {
    padding: 60px 16px;
  }

  .error-btn {
    padding: 10px 24px;
    font-size: 0.875rem;
  }

  .faq-item summary {
    font-size: 0.9375rem;
  }

  .faq-answer p {
    font-size: 0.875rem;
  }

  .footer-inner {
    padding: 32px 16px 20px;
  }

  .footer-bottom {
    padding: 16px 0;
  }
}