/* ============================================================
   base
   ============================================================ */
:root {
  --color-primary: #2C3E50;
  --color-accent: #E67E22;
  --color-bg: #FDF6EC;
  --color-card: #FFFFFF;
  --color-text: #34495E;
  --color-text-light: #7F8C8D;
  --color-border: #E8E0D4;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --container-width: 1200px;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(44, 62, 80, 0.08);
  --shadow-hover: 0 6px 18px rgba(44, 62, 80, 0.12);
  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

a:hover {
  color: #C96A1A;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.4;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 20px;
}

p {
  margin-bottom: 12px;
}

time {
  color: var(--color-text-light);
  font-size: 14px;
}

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

/* ============================================================
   layout
   ============================================================ */
.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #FFFFFF;
}

.brand-slogan {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
}

.site-nav .nav-list {
  display: flex;
  gap: 32px;
}

.site-nav .nav-list a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 16px;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.site-nav .nav-list a:hover {
  color: #FFFFFF;
  border-bottom-color: var(--color-accent);
}

.site-nav .nav-list a.is-current {
  color: #FFFFFF;
  border-bottom-color: var(--color-accent);
}

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

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  display: block;
  width: 24px;
  height: 2px;
  background-color: #FFFFFF;
  position: relative;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle-icon::before {
  position: absolute;
  top: -7px;
}

.nav-toggle-icon::after {
  position: absolute;
  top: 7px;
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  transform: translateY(7px) rotate(0deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  transform: translateY(-7px) rotate(-90deg);
}

.site-main {
  flex: 1 0 auto;
  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 48px;
}

.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: 48px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 48px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h2 {
  font-size: 16px;
  color: #FFFFFF;
  margin-bottom: 12px;
}

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

.footer-col ul li a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
}

.footer-col ul li a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  text-align: center;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

/* 面包屑 */
.breadcrumb {
  padding: 20px 0 8px;
  font-size: 14px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

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

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

.breadcrumb-sep {
  color: var(--color-text-light);
  margin: 0 2px;
}

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

/* 页面标题区 */
.page-header {
  padding: 16px 0 28px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  margin-bottom: 8px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
  margin-bottom: 0;
}

/* ============================================================
   components
   ============================================================ */

/* --- 按钮 --- */
.btn {
  display: inline-block;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius);
  min-height: 44px;
  line-height: 1.4;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: #C96A1A;
  border-color: #C96A1A;
  color: #FFFFFF;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

/* --- 首页 hero --- */
.home-hero {
  padding: 56px 0 48px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 36px;
  margin-bottom: 16px;
}

.hero-intro {
  font-size: 17px;
  color: var(--color-text);
  margin-bottom: 24px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.hero-note {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.hero-media .hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

/* --- 区块标题 --- */
.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 26px;
  margin-bottom: 4px;
}

.section-desc {
  color: var(--color-text-light);
  font-size: 15px;
  margin-bottom: 0;
}

/* --- 首页最新资讯 --- */
.latest-news {
  padding: 40px 0;
}

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

.news-card {
  background-color: var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.news-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.news-card .card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

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

.news-card .card-body h3 a {
  color: var(--color-primary);
}

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

.news-card .card-excerpt {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 12px;
}

/* --- 首页专题推荐 --- */
.topics-preview {
  padding: 40px 0;
}

.topics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.topic-card {
  background-color: var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  display: block;
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.topic-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.topic-card:hover img {
  transform: scale(1.03);
}

.topic-card .topic-info {
  padding: 20px;
}

.topic-card .topic-info h3 {
  font-size: 19px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.topic-card .topic-info p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* --- 首页编辑推荐 --- */
.editor-picks {
  padding: 40px 0;
}

.picks-list {
  display: grid;
  gap: 20px;
}

.pick-item {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--color-accent);
}

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

.pick-item h3 a {
  color: var(--color-primary);
}

.pick-item h3 a:hover {
  color: var(--color-accent);
}

.pick-excerpt {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.pick-reason {
  font-size: 14px;
  color: var(--color-accent);
  margin-bottom: 0;
}

/* --- 首页反馈 --- */
.feedback-entry {
  padding: 40px 0;
}

.feedback-entry h2 {
  margin-bottom: 16px;
}

.feedback-content {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  max-width: 720px;
}

.feedback-content p {
  font-size: 15px;
  margin-bottom: 12px;
}

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

.feedback-content a {
  font-weight: 500;
}

/* --- 频道分类页 --- */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.channel-card {
  background-color: var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.channel-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.channel-card-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.channel-card-body {
  padding: 24px;
}

.channel-card-body h2 {
  font-size: 20px;
  margin-bottom: 8px;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.channel-featured {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  margin-bottom: 16px;
}

.channel-featured h3 {
  font-size: 15px;
  color: var(--color-text-light);
  font-weight: 500;
  margin-bottom: 6px;
}

.channel-featured .featured-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.channel-featured .featured-excerpt {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 6px;
}

.channel-featured .featured-meta time {
  font-size: 13px;
}

.channel-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
}

/* 频道页说明 */
.channel-guide {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 40px;
}

.channel-guide h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.channel-guide p {
  font-size: 15px;
  margin-bottom: 12px;
}

.channel-guide p:last-child {
  margin-bottom: 0;
}

/* 相关推荐 */
.related-module {
  margin-bottom: 40px;
}

.related-module h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.related-list {
  display: grid;
  gap: 16px;
}

.related-list li {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.related-list li:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.related-list li a {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  display: block;
  margin-bottom: 4px;
}

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

.related-list .related-desc {
  font-size: 14px;
  color: var(--color-text-light);
}

/* --- 专题列表页 --- */
.section-title {
  font-size: 24px;
  margin-bottom: 8px;
}

.topic-list .section-desc {
  margin-bottom: 28px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.topic-card {
  background-color: var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.topic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.topic-card-link {
  display: block;
  color: inherit;
}

.topic-cover img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.topic-card:hover .topic-cover img {
  transform: scale(1.03);
}

.topic-card-body {
  padding: 20px;
}

.topic-card-title {
  font-size: 19px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.topic-card-summary {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.topic-card-meta {
  font-size: 13px;
  color: var(--color-text-light);
}

/* 专题说明 */
.topic-notes {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.topic-notes h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.topic-notes p {
  font-size: 15px;
  margin-bottom: 12px;
}

.topic-notes p:last-child {
  margin-bottom: 0;
}

/* --- 热点解读页 --- */
.page-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.article-main {
  min-width: 0;
}

.article-body {
  margin-bottom: 40px;
}

.article-body h2 {
  font-size: 24px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.article-body p {
  font-size: 16px;
  margin-bottom: 16px;
}

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

.article-figure img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: var(--radius);
}

.article-figure figcaption {
  font-size: 14px;
  color: var(--color-text-light);
  padding: 8px 0 0;
  text-align: center;
}

/* 相关推荐 */
.related-recommendations {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.related-recommendations h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.recommend-list {
  display: grid;
  gap: 16px;
}

.recommend-item {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 16px;
}

.recommend-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.recommend-item a {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  display: block;
  margin-bottom: 4px;
}

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

/* --- 404 页 --- */
.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px;
  flex: 1 0 auto;
  width: 100%;
}

.error-panel {
  text-align: center;
  padding: 48px 24px;
  background-color: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 40px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 28px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 480px;
  margin: 0 auto 24px;
}

.error-back {
  display: inline-block;
  padding: 10px 28px;
  background-color: var(--color-accent);
  color: #FFFFFF;
  border-radius: var(--radius);
  font-size: 15px;
  min-height: 44px;
  line-height: 1.4;
  transition: background-color var(--transition);
}

.error-back:hover {
  background-color: #C96A1A;
  color: #FFFFFF;
}

.error-links {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.error-subtitle {
  font-size: 20px;
  margin-bottom: 20px;
}

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

.error-nav-list li a {
  display: block;
  padding: 14px 20px;
  background-color: var(--color-bg);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  text-align: center;
  transition: background-color var(--transition), color var(--transition);
}

.error-nav-list li a:hover {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 1024px) {
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .header-inner {
    min-height: 56px;
    flex-wrap: wrap;
    padding: 0 16px;
  }

  .brand-logo {
    padding: 8px 0;
  }

  .nav-toggle {
    display: flex;
  }

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

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

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

  .site-nav .nav-list li {
    width: 100%;
  }

  .site-nav .nav-list a {
    display: block;
    padding: 12px 8px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 16px;
  }

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

  .home-main,
  .inner-main {
    padding: 0 16px;
  }

  .home-hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 32px 0;
  }

  .hero-content h1 {
    font-size: 28px;
  }

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

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

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

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

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

  .page-title {
    font-size: 26px;
  }

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

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

  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-bottom {
    padding: 12px 16px;
    font-size: 13px;
  }

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

  .error-code {
    font-size: 56px;
  }

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

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    text-align: center;
  }

  .news-card img {
    height: 160px;
  }

  .topic-card img,
  .channel-card-media img,
  .topic-cover img {
    height: 170px;
  }

  .pick-item {
    padding: 18px;
  }

  .feedback-content {
    padding: 20px;
  }

  .channel-card-body,
  .topic-card-body {
    padding: 18px;
  }

  .related-module h2,
  .related-recommendations h2,
  .channel-guide h2,
  .topic-notes h2 {
    font-size: 20px;
  }
}

/* 动效增强（不影响初始可见性） */
@media (prefers-reduced-motion: no-preference) {
  .news-card,
  .topic-card,
  .channel-card,
  .pick-item {
    transition: transform var(--transition), box-shadow var(--transition);
  }
}