/* ============================================================
   BASE — 全局基础样式
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #111111;
  background-color: #f4f1ea;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: #111111;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #e4572e;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.3;
  color: #111111;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 0.75rem;
}

/* 数字编号使用等宽字体 */
.step-number,
.step-number,
.archive-date,
.principle-index,
.update-time,
.plan-status,
.planned-status,
.topic-time,
.topic-time-badge,
.topic-status {
  font-family: "SF Mono", "Cascadia Code", "Roboto Mono", Consolas, monospace;
}

/* 辅助隐藏，保留可访问性 */
.visually-hidden {
  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
   ============================================================ */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  background-color: #f4f1ea;
  border-bottom: 2px solid #111111;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  color: #111111;
  white-space: nowrap;
}

.brand-link:hover {
  color: #111111;
}

.brand-name {
  letter-spacing: 0.02em;
}

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

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: block;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 600;
  color: #111111;
  border: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.nav-list a:hover {
  border-color: #111111;
  background-color: #ffffff;
}

.nav-list a.is-current {
  border-color: #111111;
  background-color: #111111;
  color: #f4f1ea;
}

.nav-toggle {
  display: none;
  background: none;
  border: 2px solid #111111;
  padding: 8px 12px;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.nav-toggle-icon {
  display: block;
  position: relative;
  width: 20px;
  height: 2px;
  background-color: #111111;
  transition: background-color 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background-color: #111111;
  transition: transform 0.2s ease;
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  top: 6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: rotate(-45deg);
  top: 0;
}

/* 首页快捷条 */
.home-quick-links {
  background-color: #111111;
  border-bottom: 2px solid #111111;
}

.home-quick-links {
  display: flex;
  justify-content: center;
  gap: 0;
}

.home-quick-links a {
  display: block;
  padding: 10px 28px;
  font-size: 14px;
  font-weight: 600;
  color: #f4f1ea;
  border-left: 1px solid #3a3a3a;
  transition: background-color 0.2s ease;
}

.home-quick-links a:first-child {
  border-left: none;
}

.home-quick-links a:hover {
  background-color: #e4572e;
  color: #ffffff;
}

/* 主内容 */
.site-main {
  flex: 1 0 auto;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
}

.site-main.inner-main {
  padding-top: 40px;
  padding-bottom: 64px;
}

.site-main.home-main {
  padding-top: 0;
  padding-bottom: 0;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  font-size: 14px;
  color: #555555;
}

.breadcrumb a {
  color: #111111;
  font-weight: 500;
}

.breadcrumb a:hover {
  color: #e4572e;
}

.breadcrumb-sep {
  color: #888888;
}

.breadcrumb-current {
  color: #555555;
  font-weight: 600;
}

/* 页面标题区（内页统一） */
.page-header {
  border-bottom: 2px solid #111111;
  padding-bottom: 24px;
  margin-bottom: 40px;
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 4px solid #e4572e;
  display: inline-block;
}

.page-description {
  font-size: 16px;
  line-height: 1.7;
  color: #333333;
  max-width: 720px;
}

/* ============================================================
   COMPONENTS — 通用组件
   ============================================================ */
/* 区块标题 */
.section-heading,
.section-title {
  margin-bottom: 24px;
}

.section-heading h2,
.section-title {
  padding-left: 14px;
  border-left: 4px solid #e4572e;
  font-size: 26px;
  margin-bottom: 8px;
}

.section-heading p,
.section-title + p,
.section-intro {
  font-size: 15px;
  color: #444444;
  max-width: 720px;
  margin-top: 8px;
}

/* 区块链接 */
.section-link {
  display: inline-block;
  margin-top: 20px;
  font-weight: 600;
  font-size: 15px;
  padding-bottom: 2px;
  border-bottom: 2px solid #e4572e;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.section-link:hover {
  color: #e4572e;
  border-color: #111111;
}

/* 频道卡片（首页与频道总览共用基础样式） */
.channel-card {
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

.channel-card:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
  box-shadow: 6px 6px 0 rgba(17, 17, 17, 0.08);
}

.channel-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-bottom: 2px solid #111111;
}

.channel-card h3 {
  font-size: 18px;
  padding: 14px 16px 4px;
}

.channel-card p {
  font-size: 14px;
  color: #444444;
  padding: 0 16px;
  margin-bottom: 14px;
}

.channel-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 14px 16px;
}

.channel-card-body .channel-name {
  font-size: 18px;
  margin-bottom: 6px;
  padding: 0;
}

.channel-card-body .channel-desc {
  font-size: 14px;
  color: #444444;
  padding: 0;
  margin-bottom: 10px;
  flex: 1;
}

.channel-card-body .channel-audience {
  font-size: 13px;
  color: #3a7ca5;
  padding: 0;
  margin-bottom: 0;
  font-weight: 600;
  border-top: 1px solid #e5e0d5;
  padding-top: 10px;
}

/* 详情折叠 FAQ */
.faq-item {
  border: 2px solid #111111;
  background-color: #ffffff;
  margin-bottom: 12px;
  border-radius: 4px;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: #e4572e;
  margin-left: 12px;
}

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

.faq-item summary:hover {
  background-color: #f4f1ea;
}

.faq-item p {
  margin: 0;
  padding: 0 20px 16px;
  font-size: 15px;
  color: #333333;
}

/* 页脚 */
.site-footer {
  background-color: #111111;
  color: #f4f1ea;
  margin-top: 64px;
  border-top: 2px solid #111111;
}

.footer-columns {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
}

.footer-col p {
  color: #cccccc;
  font-size: 14px;
  line-height: 1.7;
}

.footer-col .footer-heading {
  color: #f4f1ea;
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 12px;
}

.footer-brand {
  font-size: 24px;
  font-weight: 700;
  color: #f4f1ea;
  margin-bottom: 8px;
}

.footer-desc {
  color: #aaaaaa;
  font-size: 14px;
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid #333333;
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  color: #888888;
  font-size: 13px;
  margin: 0;
  max-width: 1200px;
  margin: 0 auto;
}

/* 相关入口（通用） */
.related-links {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 2px solid #111111;
  flex-wrap: wrap;
}

.related-links-label {
  font-weight: 700;
  font-size: 15px;
  color: #111111;
}

.related-links-item {
  font-size: 14px;
  font-weight: 600;
  color: #111111;
  border-bottom: 2px solid #e4572e;
  padding-bottom: 2px;
  transition: color 0.2s ease;
}

.related-links-item:hover {
  color: #e4572e;
}

/* ============================================================
   PAGES — 首页
   ============================================================ */
/* 首屏焦点区 */
.hero-focus {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 64px 0 56px;
  border-bottom: 2px solid #111111;
}

.hero-copy h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 4px solid #e4572e;
  display: inline-block;
}

.hero-lead {
  font-size: 17px;
  color: #333333;
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 480px;
}

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

.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 700;
  border: 2px solid #111111;
  min-height: 44px;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
  background-color: #e4572e;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #111111;
  color: #f4f1ea;
}

.btn-secondary {
  background-color: #ffffff;
  color: #111111;
}

.btn-secondary:hover {
  background-color: #111111;
  color: #ffffff;
}

.hero-media {
  position: relative;
}

.hero-figure {
  border: 2px solid #111111;
  border-radius: 6px;
  overflow: hidden;
  background-color: #ffffff;
  box-shadow: 10px 10px 0 rgba(17, 17, 17, 0.12);
}

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

/* 频道速览带 */
.channel-strip {
  padding: 56px 0;
  border-bottom: 2px solid #111111;
}

.channel-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.channel-cards .channel-card p {
  font-size: 14px;
  color: #444444;
  padding: 0 16px;
  margin-bottom: 16px;
  flex: 1;
}

/* 专题预览 */
.topic-preview {
  padding: 56px 0;
  border-bottom: 2px solid #111111;
}

.topic-cards {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.topic-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.topic-card:nth-child(even) {
  grid-template-columns: 1fr 1fr;
}

.topic-card:nth-child(even) .topic-media {
  order: 2;
}

.topic-card:nth-child(even) .topic-content {
  order: 1;
}

.topic-card:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
}

.topic-media {
  overflow: hidden;
}

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

.topic-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.topic-time {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: #e4572e;
  background-color: #f4f1ea;
  border: 1px solid #111111;
  padding: 2px 10px;
  margin-bottom: 12px;
  align-self: flex-start;
}

.topic-content h3 {
  font-size: 22px;
  margin-bottom: 8px;
}

.topic-content p {
  font-size: 15px;
  color: #444444;
  margin-bottom: 0;
}

/* 观看路径提示带 */
.watch-strip {
  padding: 56px 0;
  border-bottom: 2px solid #111111;
}

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

.step-item {
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.step-item:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
}

.step-item .step-number {
  display: inline-block;
  font-size: 28px;
  font-weight: 700;
  color: #e4572e;
  margin-bottom: 8px;
}

.step-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* 内容边界声明条 */
.policy-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 24px 28px;
  margin: 48px 0;
}

.policy-note p {
  margin: 0;
  font-size: 15px;
  color: #333333;
}

.policy-note strong {
  display: block;
  font-size: 17px;
  margin-bottom: 4px;
}

.policy-link {
  font-weight: 700;
  color: #e4572e;
  border-bottom: 2px solid #e4572e;
  white-space: nowrap;
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.policy-link:hover {
  color: #111111;
  border-color: #111111;
}

/* 首页 FAQ */
.faq-section {
  padding: 16px 0 56px;
}

.faq-more {
  margin-top: 16px;
  font-size: 15px;
  color: #333333;
}

.faq-more a {
  font-weight: 600;
  color: #e4572e;
  border-bottom: 1px solid #e4572e;
  padding-bottom: 1px;
  margin: 0 4px;
}

.faq-more a:hover {
  color: #111111;
  border-color: #111111;
}

/* ============================================================
   PAGES — 频道总览
   ============================================================ */
.problem-note {
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 28px;
  margin-bottom: 40px;
}

.problem-note .section-title {
  margin-bottom: 12px;
}

.problem-note > p {
  font-size: 15px;
  color: #333333;
  margin-bottom: 16px;
}

.note-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.note-list li {
  font-size: 14px;
  color: #444444;
  border-left: 3px solid #e4572e;
  padding-left: 12px;
  line-height: 1.6;
}

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

.channel-list .channel-card {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 0;
  margin-bottom: 20px;
}

.channel-list .channel-card img {
  width: 160px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-right: 2px solid #111111;
  border-bottom: none;
  height: 100%;
}

.channel-list .channel-card-body {
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.topic-links {
  margin-top: 8px;
}

.topic-links > p {
  font-size: 15px;
  color: #444444;
  margin-bottom: 16px;
}

.topic-links > p a {
  font-weight: 600;
  color: #e4572e;
  border-bottom: 1px solid #e4572e;
  padding-bottom: 1px;
}

.topic-links > p a:hover {
  color: #111111;
  border-color: #111111;
}

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

.topic-link-card {
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.topic-link-card:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
}

.topic-link-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.topic-link-card p {
  font-size: 14px;
  color: #444444;
  margin-bottom: 16px;
}

.topic-link-card a {
  font-size: 14px;
  font-weight: 700;
  color: #e4572e;
  border-bottom: 2px solid #e4572e;
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.topic-link-card a:hover {
  color: #111111;
  border-color: #111111;
}

/* ============================================================
   PAGES — 专题时间线
   ============================================================ */
/* 当前专题大卡 */
.current-topic {
  margin-bottom: 56px;
}

.topic-feature-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  overflow: hidden;
}

.topic-feature-media {
  overflow: hidden;
}

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

.topic-feature-body {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.topic-time-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: #ffffff;
  background-color: #e4572e;
  border: 1px solid #111111;
  padding: 2px 12px;
  margin-bottom: 12px;
  align-self: flex-start;
}

.topic-feature-body .topic-name {
  font-size: 24px;
  margin-bottom: 12px;
}

.topic-feature-body .topic-desc {
  font-size: 15px;
  color: #444444;
  margin-bottom: 16px;
}

.topic-feature-body .topic-audience {
  font-size: 14px;
  color: #3a7ca5;
  font-weight: 600;
  border-top: 1px solid #e5e0d5;
  padding-top: 12px;
  margin-bottom: 0;
}

/* 近期专题 */
.recent-topics {
  margin-bottom: 56px;
}

.recent-topic-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.recent-topic-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.recent-topic-item:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
}

.recent-topic-media {
  overflow: hidden;
}

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

.recent-topic-info {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.topic-status {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: #111111;
  background-color: #f4f1ea;
  border: 1px solid #111111;
  padding: 2px 10px;
  margin-bottom: 8px;
  align-self: flex-start;
}

.recent-topic-info .topic-name {
  font-size: 18px;
  margin-bottom: 6px;
}

.recent-topic-info .topic-desc {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* 历史归档 */
.archived-topics {
  margin-bottom: 56px;
}

.archive-list {
  display: flex;
  flex-direction: column;
  border-top: 2px solid #111111;
}

.archive-item {
  display: grid;
  grid-template-columns: 120px 220px 1fr auto;
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 2px solid #111111;
  transition: background-color 0.2s ease;
}

.archive-item:hover {
  background-color: rgba(255, 255, 255, 0.6);
}

.archive-date {
  font-size: 14px;
  font-weight: 600;
  color: #e4572e;
}

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

.archive-desc {
  font-size: 14px;
  color: #444444;
  margin: 0;
}

.archive-links a {
  font-size: 14px;
  font-weight: 600;
  color: #3a7ca5;
  border-bottom: 1px solid #3a7ca5;
  padding-bottom: 1px;
  white-space: nowrap;
}

.archive-links a:hover {
  color: #e4572e;
  border-color: #e4572e;
}

/* 未来计划 */
.planned-topics {
  margin-bottom: 48px;
}

.planned-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.planned-item {
  background-color: #ffffff;
  border: 2px dashed #111111;
  border-radius: 6px;
  padding: 24px;
}

.planned-status {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: #3a7ca5;
  background-color: #f4f1ea;
  border: 1px solid #3a7ca5;
  padding: 2px 10px;
  margin-bottom: 10px;
}

.planned-item .planned-name {
  font-size: 18px;
  margin-bottom: 8px;
}

.planned-item .planned-desc {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* 相关入口 */
.related-entry {
  padding-top: 8px;
}

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

.entry-card {
  display: block;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.entry-card:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
}

.entry-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.entry-card .entry-desc {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* ============================================================
   PAGES — 观看路径
   ============================================================ */
.problem-summary {
  margin-bottom: 48px;
}

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

.misstep-item {
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 24px;
  border-left-width: 6px;
  border-left-color: #e4572e;
}

.misstep-item h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.misstep-item p {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* 步骤区 */
.steps-section {
  margin-bottom: 56px;
}

.path-step {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
  align-items: center;
}

.path-step:nth-child(even) .step-media {
  order: 2;
}

.path-step:nth-child(even) .step-body {
  order: 1;
}

.step-media {
  overflow: hidden;
  border: 2px solid #111111;
  border-radius: 6px;
}

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

.step-body .step-number {
  font-size: 32px;
  font-weight: 700;
  color: #e4572e;
  margin-bottom: 4px;
  display: block;
}

.step-body h3 {
  font-size: 22px;
  margin-bottom: 12px;
}

.step-body p {
  font-size: 15px;
  color: #333333;
  margin-bottom: 12px;
}

.step-body p a {
  font-weight: 600;
  color: #3a7ca5;
  border-bottom: 1px solid #3a7ca5;
  padding-bottom: 1px;
}

.step-body p a:hover {
  color: #e4572e;
  border-color: #e4572e;
}

.step-body .checkpoint {
  font-size: 14px;
  color: #111111;
  background-color: #f4f1ea;
  border-left: 4px solid #3a7ca5;
  padding: 10px 14px;
  margin-bottom: 0;
}

/* 观看路径 FAQ */
.faq-section .faq-item {
  max-width: 100%;
}

/* 相关入口卡 */
.related-card-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.related-card {
  display: block;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.related-card:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
}

.related-card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.related-card p {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* ============================================================
   PAGES — 内容时间线
   ============================================================ */
.latest-updates {
  margin-bottom: 56px;
}

.update-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.update-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.update-item:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
}

.update-media {
  overflow: hidden;
}

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

.update-body {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.update-time {
  font-size: 13px;
  font-weight: 600;
  color: #e4572e;
  margin-bottom: 6px;
}

.update-body h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.update-summary {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* 历史归档索引 */
.archive-index {
  margin-bottom: 56px;
}

.archive-groups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.archive-group {
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 24px;
}

.archive-group h3 {
  font-size: 18px;
  padding-bottom: 12px;
  border-bottom: 2px solid #111111;
  margin-bottom: 16px;
}

.archive-list li {
  display: flex;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid #e5e0d5;
  font-size: 14px;
  align-items: baseline;
}

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

.archive-date {
  font-size: 13px;
  color: #e4572e;
  font-weight: 600;
  white-space: nowrap;
}

.archive-list a {
  color: #111111;
  font-weight: 500;
  transition: color 0.2s ease;
}

.archive-list a:hover {
  color: #e4572e;
}

/* 未来计划 */
.future-plans {
  margin-bottom: 48px;
}

.plan-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.plan-item {
  background-color: #ffffff;
  border: 2px dashed #111111;
  border-radius: 6px;
  padding: 24px;
}

.plan-status {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: #3a7ca5;
  background-color: #f4f1ea;
  border: 1px solid #3a7ca5;
  padding: 2px 10px;
  margin-bottom: 10px;
}

.plan-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.plan-summary {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* 相关入口 */
.related-entry .related-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

/* ============================================================
   PAGES — 规范与反馈
   ============================================================ */
.principles-section,
.boundaries-section,
.feedback-section {
  margin-bottom: 56px;
}

.principles-grid,
.boundaries-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.principle-card,
.boundary-card {
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 24px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.principle-card:hover,
.boundary-card:hover {
  transform: translateY(-4px);
  border-color: #e4572e;
}

.principle-index {
  display: block;
  font-size: 24px;
  font-weight: 700;
  color: #e4572e;
  margin-bottom: 8px;
}

.principle-card h3,
.boundary-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}

.principle-card p,
.boundary-card p {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

/* 反馈流程 */
.feedback-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.feedback-steps {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.feedback-step {
  display: flex;
  gap: 16px;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 20px;
}

.feedback-step .step-number {
  font-size: 28px;
  font-weight: 700;
  color: #e4572e;
  flex-shrink: 0;
  line-height: 1;
}

.feedback-step h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.feedback-step p {
  font-size: 14px;
  color: #444444;
  margin-bottom: 0;
}

.feedback-figure {
  border: 2px solid #111111;
  border-radius: 6px;
  overflow: hidden;
  background-color: #ffffff;
}

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

.feedback-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: #555555;
  border-top: 2px solid #111111;
  background-color: #f4f1ea;
  text-align: center;
}

.feedback-note {
  margin-top: 24px;
  font-size: 14px;
  color: #333333;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 16px 20px;
}

.feedback-note a {
  font-weight: 700;
  color: #e4572e;
  border-bottom: 2px solid #e4572e;
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.feedback-note a:hover {
  color: #111111;
  border-color: #111111;
}

/* 相关入口 */
.related-section .related-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.related-section .related-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.related-title {
  font-size: 18px;
  font-weight: 700;
  color: #111111;
}

.related-desc {
  font-size: 14px;
  color: #444444;
}

/* ============================================================
   PAGES — 404
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 64px 24px;
}

.error-wrap {
  text-align: left;
  max-width: 560px;
  width: 100%;
  background-color: #ffffff;
  border: 2px solid #111111;
  border-radius: 6px;
  padding: 48px;
  box-shadow: 10px 10px 0 rgba(17, 17, 17, 0.1);
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: #e4572e;
  line-height: 1;
  margin-bottom: 16px;
  font-family: "SF Mono", "Cascadia Code", "Roboto Mono", Consolas, monospace;
}

.error-wrap h1 {
  font-size: 26px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: #444444;
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: #111111;
  color: #f4f1ea;
  font-size: 15px;
  font-weight: 700;
  border: 2px solid #111111;
  min-height: 44px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.error-btn:hover {
  background-color: #e4572e;
  color: #ffffff;
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 2px solid #111111;
}

.error-links a {
  font-size: 14px;
  font-weight: 600;
  color: #3a7ca5;
  border-bottom: 1px solid #3a7ca5;
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.error-links a:hover {
  color: #e4572e;
  border-color: #e4572e;
}

/* ============================================================
   RESPONSIVE — 响应式
   ============================================================ */
@media (max-width: 1024px) {
  .channel-cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .archive-item {
    grid-template-columns: 100px 1fr 1fr;
  }

  .archive-links {
    grid-column: 2 / -1;
  }

  .topic-link-cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    min-height: 64px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    order: 3;
    width: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0;
    border-top: 2px solid #111111;
    width: 100%;
  }

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

  .nav-list a {
    padding: 14px 16px;
    border: none;
    border-bottom: 1px solid #e5e0d5;
    font-size: 16px;
  }

  .nav-list a.is-current {
    background-color: #f4f1ea;
    color: #111111;
    border-left: 4px solid #e4572e;
  }

  .home-quick-links {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .home-quick-links a {
    padding: 10px 16px;
    flex: 1 1 auto;
    text-align: center;
    border-left: none;
    border-bottom: 1px solid #333333;
  }

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

  .site-main.inner-main {
    padding-top: 24px;
    padding-bottom: 40px;
  }

  .page-title {
    font-size: 28px;
  }

  /* 首页 */
  .hero-focus {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0;
  }

  .hero-copy h1 {
    font-size: 30px;
  }

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

  .topic-card,
  .topic-card:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .topic-card:nth-child(even) .topic-media,
  .topic-card:nth-child(even) .topic-content {
    order: 0;
  }

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

  .policy-note {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
  }

  /* 频道总览 */
  .note-list {
    grid-template-columns: 1fr;
  }

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

  .channel-list .channel-card img {
    width: 100%;
    border-right: none;
    border-bottom: 2px solid #111111;
  }

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

  /* 专题时间线 */
  .topic-feature-card {
    grid-template-columns: 1fr;
  }

  .recent-topic-item {
    grid-template-columns: 1fr;
  }

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

  .archive-item {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 16px 0;
  }

  .archive-links {
    grid-column: auto;
  }

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

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

  /* 观看路径 */
  .misstep-list {
    grid-template-columns: 1fr;
  }

  .path-step,
  .path-step:nth-child(even) {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .path-step:nth-child(even) .step-media,
  .path-step:nth-child(even) .step-body {
    order: 0;
  }

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

  /* 内容时间线 */
  .update-item {
    grid-template-columns: 1fr;
  }

  .update-media img {
    aspect-ratio: 16 / 9;
  }

  .archive-groups {
    grid-template-columns: 1fr;
  }

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

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

  /* 规范与反馈 */
  .principles-grid,
  .boundaries-grid {
    grid-template-columns: 1fr;
  }

  .feedback-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  /* 页脚 */
  .footer-columns {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 24px;
  }

  .footer-bottom {
    padding: 16px;
  }

  /* 404 */
  .error-main {
    padding: 40px 16px;
  }

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

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

@media (max-width: 480px) {
  .header-inner {
    gap: 12px;
  }

  .brand-link {
    font-size: 22px;
  }

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

  .btn-primary,
  .btn-secondary {
    text-align: center;
  }

  .topic-content,
  .topic-feature-body,
  .step-item,
  .misstep-item,
  .plan-item,
  .planned-item,
  .principle-card,
  .boundary-card,
  .topic-link-card,
  .entry-card,
  .related-card {
    padding: 20px;
  }

  .faq-item summary {
    padding: 14px 16px;
    font-size: 15px;
  }

  .faq-item p {
    padding: 0 16px 14px;
  }
}