/* ============================================================
   base — 重置、变量、全局基础
   ============================================================ */
:root {
  --color-white: #ffffff;
  --color-dark: #1a1a1a;
  --color-accent: #e63946;
  --color-light: #f4f4f4;
  --color-gray: #cccccc;
  --color-text: #333333;
  --color-muted: #666666;
  --color-border: #e0e0e0;
  --color-bg: #fafafa;
  --font-family: Arial, Helvetica, sans-serif;
  --font-size-body: 16px;
  --font-size-h1: 32px;
  --font-size-h2: 24px;
  --font-size-h3: 20px;
  --container-width: 1200px;
  --container-padding: 20px;
  --radius-card: 8px;
  --radius-small: 4px;
  --transition-base: 0.2s ease;
  --header-height: 72px;
  --shadow-card: 0 1px 4px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.12);
}

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

html {
  font-size: var(--font-size-body);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-white);
}

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

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

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

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: var(--font-size-h1);
}

h2 {
  font-size: var(--font-size-h2);
}

h3 {
  font-size: var(--font-size-h3);
}

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

/* 统一容器 */
.header-inner,
.site-main,
.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

/* ============================================================
   layout — 页头、页脚、全局布局骨架
   ============================================================ */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 24px;
}

.brand-logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
  letter-spacing: 0;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-muted);
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-list li a {
  display: block;
  padding: 8px 16px;
  color: var(--color-dark);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-small);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

.nav-list li a.is-current {
  color: var(--color-accent);
  background-color: rgba(230, 57, 70, 0.08);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  cursor: pointer;
  padding: 8px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-dark);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* 页脚 */
.site-footer {
  background-color: var(--color-dark);
  color: var(--color-light);
  margin-top: 60px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 24px;
  padding-bottom: 24px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-brand-link {
  color: var(--color-white);
  font-size: 18px;
  font-weight: 700;
}

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

.footer-slogan {
  font-size: 13px;
  color: var(--color-gray);
}

.footer-nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-nav a {
  color: var(--color-gray);
  font-size: 14px;
  padding: 4px 0;
}

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

.footer-copyright {
  font-size: 13px;
  color: var(--color-gray);
}

/* 内页统一骨架 */
.site-main.inner-main {
  padding-top: 32px;
  padding-bottom: 40px;
  min-height: 60vh;
}

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

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

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

.breadcrumb-sep {
  color: var(--color-gray);
}

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

/* 页面标题区（内页统一） */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--color-light);
}

.page-title {
  font-size: var(--font-size-h1);
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.3;
  margin-bottom: 8px;
}

.page-description {
  color: var(--color-muted);
  max-width: 720px;
  font-size: 15px;
}

/* ============================================================
   components — 通用组件
   ============================================================ */
.section-title {
  font-size: var(--font-size-h2);
  color: var(--color-dark);
  margin-bottom: 12px;
  position: relative;
}

.section-intro {
  color: var(--color-muted);
  margin-bottom: 24px;
  max-width: 640px;
}

.section-desc {
  color: var(--color-muted);
  margin-bottom: 24px;
  max-width: 720px;
}

/* 按钮 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-small);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #c92a36;
  color: var(--color-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-dark);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-dark);
  color: var(--color-dark);
  background-color: var(--color-light);
}

/* ============================================================
   pages — 首页
   ============================================================ */
/* hero 焦点报道 */
.hero-section {
  background-color: var(--color-light);
  border-bottom: 1px solid var(--color-border);
}

.hero-section .header-inner,
.hero-section {
  padding-top: 0;
  padding-bottom: 0;
}

.hero-section {
  display: flex;
  align-items: center;
}

.hero-section > .hero-content,
.hero-section > .hero-media {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 48px;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
}

.hero-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.25;
}

.hero-slogan {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-accent);
}

.hero-description {
  color: var(--color-muted);
  font-size: 15px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.hero-media {
  display: flex;
  justify-content: flex-end;
}

.hero-figure {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}

.hero-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
}

/* 频道分类导航带 */
.channel-nav-section {
  padding-top: 48px;
  padding-bottom: 24px;
}

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

.channel-tag {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-dark);
  font-size: 14px;
  font-weight: 500;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}

.channel-tag:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}

/* 最新资讯列表 */
.latest-list-section {
  padding-top: 32px;
  padding-bottom: 24px;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
}

.news-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  align-items: start;
}

.news-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.news-category {
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 600;
}

.news-title {
  font-size: 18px;
  line-height: 1.4;
}

.news-title a {
  color: var(--color-dark);
}

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

.news-summary {
  color: var(--color-muted);
  font-size: 14px;
  grid-column: 2;
  margin-top: -12px;
}

/* 专题推荐区 */
.topic-cards-section {
  padding-top: 32px;
  padding-bottom: 24px;
  background-color: var(--color-light);
}

.topic-cards-section .header-inner,
.topic-cards-section .footer-inner {
  background: none;
}

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

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

.topic-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

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

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

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

.topic-card-title a {
  color: var(--color-dark);
}

.topic-card-title a:hover {
  color: var(--color-accent);
}

.topic-card-text {
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 16px;
}

.topic-card-link {
  font-size: 14px;
  font-weight: 600;
}

/* 编辑推荐 */
.editor-picks-section {
  padding-top: 32px;
  padding-bottom: 24px;
}

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

.editor-pick-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background-color: var(--color-light);
  border-radius: var(--radius-card);
  border-left: 3px solid var(--color-accent);
}

.pick-rank {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  flex-shrink: 0;
}

.pick-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pick-title {
  font-size: 16px;
  line-height: 1.4;
}

.pick-title a {
  color: var(--color-dark);
}

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

.pick-reason {
  font-size: 13px;
  color: var(--color-muted);
}

/* 信息来源与反馈说明 */
.feedback-section {
  padding-top: 32px;
  padding-bottom: 24px;
  background-color: var(--color-light);
  border-top: 1px solid var(--color-border);
}

.feedback-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 720px;
}

.feedback-content p {
  color: var(--color-muted);
  font-size: 14px;
}

/* ============================================================
   pages — 频道分类页 channels.html
   ============================================================ */
.channel-list {
  margin-bottom: 48px;
}

.channel-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 20px;
  margin-bottom: 20px;
  transition: box-shadow var(--transition-base);
}

.channel-card:hover {
  box-shadow: var(--shadow-card);
}

.channel-media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-small);
}

.channel-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}

.channel-name {
  font-size: 20px;
  color: var(--color-dark);
}

.channel-body p {
  color: var(--color-muted);
  font-size: 14px;
}

.channel-link {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
}

/* 频道介绍 */
.channel-intro {
  margin-bottom: 48px;
}

.intro-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.intro-item {
  background-color: var(--color-light);
  border-radius: var(--radius-card);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.intro-name {
  font-size: 16px;
  color: var(--color-dark);
}

.intro-item p {
  font-size: 13px;
  color: var(--color-muted);
}

/* 频道使用提示 */
.channel-tips {
  background-color: var(--color-light);
  border-radius: var(--radius-card);
  padding: 24px;
}

.channel-tips p {
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.channel-tips p a {
  margin-right: 16px;
  display: inline-block;
}

/* ============================================================
   pages — 内容专题页 topics.html
   ============================================================ */
.topic-grid {
  margin-bottom: 48px;
}

.topic-grid .topic-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

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

.topic-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.topic-title {
  font-size: 18px;
}

.topic-title a {
  color: var(--color-dark);
}

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

.topic-summary {
  color: var(--color-muted);
  font-size: 14px;
  flex: 1;
}

.topic-link {
  font-size: 14px;
  font-weight: 600;
}

/* 专题摘要 */
.topic-summary-block {
  margin-bottom: 32px;
}

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

.summary-item {
  background-color: var(--color-light);
  border-radius: var(--radius-card);
  padding: 20px;
  border-left: 3px solid var(--color-accent);
}

.summary-item-title {
  font-size: 16px;
  margin-bottom: 8px;
}

.summary-item-text {
  font-size: 14px;
  color: var(--color-muted);
}

/* ============================================================
   pages — 实用指南页 guide.html
   ============================================================ */
.guide-section {
  margin-bottom: 48px;
}

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

.guide-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  transition: box-shadow var(--transition-base);
}

.guide-item:hover {
  box-shadow: var(--shadow-card);
}

.guide-item-text {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.guide-item-title {
  font-size: 18px;
}

.guide-item-excerpt {
  font-size: 14px;
  color: var(--color-muted);
}

.guide-item-link {
  font-size: 14px;
  font-weight: 600;
  flex-shrink: 0;
}

/* 指南详情 */
.guide-detail-section {
  margin-bottom: 48px;
}

.guide-article {
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.guide-article:last-child {
  border-bottom: none;
}

.guide-article-media {
  margin-bottom: 16px;
}

.guide-article-img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.guide-article-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.guide-article-text {
  color: var(--color-muted);
  font-size: 15px;
  margin-bottom: 12px;
  max-width: 720px;
}

.guide-article-back {
  font-size: 14px;
  font-weight: 600;
}

/* 相关链接 */
.related-section {
  margin-bottom: 32px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.related-links a {
  display: block;
  padding: 12px 16px;
  background-color: var(--color-light);
  border-radius: var(--radius-small);
  font-size: 14px;
  color: var(--color-dark);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.related-links a:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* 反馈说明 */
.feedback-note {
  background-color: var(--color-light);
  border-radius: var(--radius-card);
  padding: 20px 24px;
  margin-top: 32px;
}

.feedback-text {
  font-size: 14px;
  color: var(--color-muted);
}

/* ============================================================
   pages — 深度解读页 feature1.html
   ============================================================ */
.article-body {
  max-width: 860px;
}

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

.article-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-light);
}

.article-section p {
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-figure {
  margin: 20px 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.article-figure img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

.article-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
}

/* ============================================================
   pages — 404 页
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding-top: 40px;
  padding-bottom: 40px;
}

.error-content {
  text-align: center;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.error-title {
  font-size: 48px;
  color: var(--color-accent);
  line-height: 1.2;
}

.error-desc {
  color: var(--color-muted);
  font-size: 15px;
}

.error-btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: var(--radius-small);
  font-size: 15px;
  font-weight: 600;
  transition: background-color var(--transition-base);
}

.error-btn:hover {
  background-color: #c92a36;
  color: var(--color-white);
}

/* ============================================================
   responsive — 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .intro-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

@media (max-width: 768px) {
  /* 导航切换 */
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 20px 16px;
    box-shadow: var(--shadow-card);
  }

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

  .nav-list li a {
    padding: 12px 8px;
    border-bottom: 1px solid var(--color-light);
    border-radius: 0;
  }

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

  .site-nav {
    position: relative;
  }

  /* hero 改单列 */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 32px;
    padding-bottom: 32px;
  }

  .hero-media {
    justify-content: center;
  }

  .hero-figure img {
    height: 240px;
  }

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

  /* 资讯列表改单列 */
  .news-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .news-summary {
    grid-column: 1;
    margin-top: 0;
  }

  /* 专题卡片 */
  .topic-cards {
    grid-template-columns: 1fr;
  }

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

  /* 频道卡片 */
  .channel-card {
    grid-template-columns: 1fr;
  }

  .channel-media img {
    height: 200px;
  }

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

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

  /* 指南 */
  .guide-item {
    flex-direction: column;
    align-items: flex-start;
  }

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

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

  /* 页脚 */
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  :root {
    --container-padding: 16px;
  }

  .header-inner {
    gap: 12px;
  }

  .brand-name {
    font-size: 18px;
  }

  .brand-slogan {
    font-size: 11px;
  }

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

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

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    text-align: center;
  }

  .channel-tags {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .channel-tag {
    flex-shrink: 0;
  }

  .news-item {
    padding: 16px 0;
  }

  .topic-card-media img {
    height: 160px;
  }

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

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

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

  .footer-nav {
    flex-direction: column;
    gap: 8px;
  }
}