/* ==========================================================================
   黑料网最新网址 · 全站样式表
   低饱和多彩风 · 灰调色标 · 内容宽度 1200px · 断点 768px
   ========================================================================== */

/* ==========================================================================
   01 · base —— 重置、变量、全局基础
   ========================================================================== */

:root {
  --color-bg: #f5f5f5;
  --color-text: #333333;
  --color-text-secondary: #6b7280;
  --color-border: #e5e7eb;
  --color-heading: #1f2937;
  --color-white: #ffffff;
  --color-accent: #4b5563;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-xl: 48px;
  --space-2xl: 64px;

  --header-height: 64px;
  --transition-fast: 0.2s ease;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-heading);
  line-height: 1.3;
  font-weight: 600;
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 20px;
}

p {
  line-height: 1.7;
}

/* 滚动出现动画 —— 仅在支持时生效，不影响初始可见性 */
@media (prefers-reduced-motion: no-preference) {
  .section-block,
  .topic-card,
  .insight-card,
  .tip-item {
    animation: fadeInUp 0.5s ease both;
  }

  .section-block:nth-child(2) {
    animation-delay: 0.05s;
  }

  .section-block:nth-child(3) {
    animation-delay: 0.1s;
  }

  .section-block:nth-child(4) {
    animation-delay: 0.15s;
  }

  .section-block:nth-child(5) {
    animation-delay: 0.2s;
  }

  .section-block:nth-child(6) {
    animation-delay: 0.25s;
  }

  @keyframes fadeInUp {
    from {
      opacity: 0.4;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* ==========================================================================
   02 · layout —— 全站骨架、容器、页头、页脚、面包屑
   ========================================================================== */

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

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

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

.brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-list li a {
  display: block;
  padding: 6px 12px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-list li a:hover {
  color: var(--color-heading);
  background-color: rgba(0, 0, 0, 0.04);
}

.nav-list li a.is-current {
  color: var(--color-heading);
  font-weight: 600;
  background-color: rgba(0, 0, 0, 0.06);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 14px;
  font-size: 14px;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

.tool-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-2xl);
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs);
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

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

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

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: var(--space-xl);
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: var(--space-sm);
}

.page-description {
  font-size: 16px;
  color: var(--color-text-secondary);
  max-width: 720px;
  line-height: 1.7;
}

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

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md) var(--space-lg);
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-heading);
  white-space: nowrap;
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-text-secondary);
  max-width: 420px;
  line-height: 1.6;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-lg);
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: var(--space-sm);
}

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

.footer-col ul li a {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 16px;
  font-size: 14px;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  transition: border-color var(--transition-fast), color var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

/* 侧栏布局容器 —— 主内容在前，aside 在后 */
.layout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-xl);
}

.layout-shell .main-content {
  min-width: 0;
}

.layout-shell aside {
  min-width: 0;
}

/* 侧栏在前的布局 */
.sidebar-left {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: var(--space-xl);
  align-items: start;
}

.sidebar-left .channel-sidebar,
.sidebar-left .sidebar {
  grid-column: 1;
  grid-row: 1;
}

.sidebar-left .channel-content,
.sidebar-left .main-content {
  grid-column: 2;
  grid-row: 1;
}

/* ==========================================================================
   03 · components —— 通用组件
   ========================================================================== */

/* 通用 section 区块 */
.section-block {
  padding: var(--space-xl) 0;
}

.section-block + .section-block {
  border-top: 1px solid var(--color-border);
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  max-width: 720px;
}

.section-title {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-heading);
  margin-bottom: var(--space-md);
}

/* 文本链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  padding: 4px 0;
}

.text-link::after {
  content: "→";
  font-size: 14px;
  transition: transform var(--transition-fast);
}

.text-link:hover::after {
  transform: translateX(3px);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.btn-primary:hover {
  background-color: #111827;
  border-color: #111827;
  color: var(--color-white);
  box-shadow: var(--shadow-card-hover);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-heading);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* 卡片通用 */
.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
}

/* 图片容器约束 */
figure {
  margin: 0;
}

figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   04 · pages —— 首页
   ========================================================================== */

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

/* 首屏 hero */
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
  padding: var(--space-2xl) 0 var(--space-xl);
}

.hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--color-border);
}

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

.hero-content {
  min-width: 0;
}

.hero-content h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

.hero-summary {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
  max-width: 520px;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

/* 焦点报道 */
.featured-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  align-items: center;
}

.featured-text {
  min-width: 0;
}

.featured-text h3 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}

.featured-text p {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

.featured-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--color-border);
}

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

/* 频道标签 */
.channel-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.channel-tag {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: border-color var(--transition-fast),
    color var(--transition-fast), box-shadow var(--transition-fast);
}

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

/* 最新资讯列表 */
.news-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.news-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: box-shadow var(--transition-fast);
}

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

.news-text {
  flex: 1;
  min-width: 0;
}

.news-text h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.news-text h3 a {
  color: var(--color-heading);
}

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

.news-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-date {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.news-item img {
  width: 140px;
  height: 88px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

/* 专题推荐 */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.topic-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

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

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

.topic-card-content {
  padding: var(--space-md);
}

.topic-card-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
}

.topic-card-content h3 a {
  color: var(--color-heading);
}

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

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

/* 编辑推荐 */
.picks-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.pick-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  transition: box-shadow var(--transition-fast);
}

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

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

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

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

.pick-reason {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 信息来源与反馈 */
.source-feedback-section {
  padding-bottom: var(--space-2xl);
}

.source-feedback-section p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 720px;
}

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

/* ==========================================================================
   05 · pages —— 频道分类页
   ========================================================================== */

.channel-sidebar {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
}

.sidebar-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.channel-index-list {
  display: flex;
  flex-direction: column;
}

.channel-index-list li a {
  display: block;
  padding: 10px 12px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
}

.channel-index-list li a:hover {
  background-color: rgba(0, 0, 0, 0.04);
  color: var(--color-accent);
}

.channel-content {
  min-width: 0;
}

.channel-section {
  margin-bottom: var(--space-xl);
}

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

.channel-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

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

.content-media-inline {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--space-md);
  aspect-ratio: 16 / 8;
  background-color: var(--color-border);
}

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

.content-media-inline figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 8px 12px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.article-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  transition: box-shadow var(--transition-fast);
}

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

.article-link {
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-heading);
  line-height: 1.5;
}

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

/* ==========================================================================
   06 · pages —— 内容专题页
   ========================================================================== */

.topic-grid {
  margin-bottom: var(--space-xl);
}

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

.topic-card-link {
  display: block;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 100%;
  transition: box-shadow var(--transition-fast);
}

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

.topic-media {
  aspect-ratio: 16 / 9;
  background-color: var(--color-border);
  overflow: hidden;
}

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

.topic-card-body {
  padding: var(--space-md);
}

.topic-card-body h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.topic-card-body p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

.topic-meta {
  display: inline-block;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.topic-entry-info,
.topic-collection-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.topic-entry-info p,
.topic-collection-note p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

.topic-entry-info p:last-child,
.topic-collection-note p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   07 · pages —— 实用指南页
   ========================================================================== */

.sidebar {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.filter-methods h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.method-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.method-list li h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

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

.related-links h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.related-links ul li {
  margin-bottom: 8px;
}

.related-links ul li a {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

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

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

.browsing-tips {
  margin-bottom: var(--space-xl);
}

.browsing-tips h2 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.intro-text {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  max-width: 720px;
}

.tip-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.tip-item h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.tip-item p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.guide-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: var(--space-lg) 0;
  aspect-ratio: 16 / 7;
  background-color: var(--color-border);
}

.guide-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.guide-figure figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding: 8px 12px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.feedback-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.feedback-note h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feedback-note p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

/* ==========================================================================
   08 · pages —— 深度解读页
   ========================================================================== */

.insights-section {
  margin-bottom: var(--space-xl);
}

.insight-card {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: var(--space-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  transition: box-shadow var(--transition-fast);
}

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

.insight-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--color-border);
}

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

.insight-content {
  min-width: 0;
}

.insight-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
  line-height: 1.4;
}

.insight-content h3 a {
  color: var(--color-heading);
}

.insight-content h3 a:hover {
  color: var(--color-accent);
}

.insight-meta {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.insight-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.method-section {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.method-section h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.method-section p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

.method-section .method-list {
  margin: var(--space-md) 0;
}

.method-section .method-list li {
  padding-left: var(--space-md);
  position: relative;
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.6;
}

.method-section .method-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.method-section .text-link {
  margin-right: var(--space-md);
}

/* ==========================================================================
   09 · pages —— 404 页面
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--header-height) - 320px);
  padding: var(--space-2xl) var(--space-md);
}

.error-wrap {
  text-align: center;
  max-width: 520px;
  padding: var(--space-xl);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

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

.error-wrap h1 {
  font-size: 24px;
  margin-bottom: var(--space-sm);
}

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

.error-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-white);
  background-color: var(--color-heading);
  border: 1px solid var(--color-heading);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.error-link:hover {
  background-color: #111827;
  color: var(--color-white);
  box-shadow: var(--shadow-card-hover);
}

/* ==========================================================================
   10 · responsive —— 响应式适配
   ========================================================================== */

/* 平板及以下 */
@media (max-width: 1024px) {
  .hero-section {
    gap: var(--space-lg);
  }

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

  .featured-media {
    order: -1;
  }

  .insight-card {
    grid-template-columns: 180px minmax(0, 1fr);
  }
}

/* 手机断点 768px */
@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: var(--header-height);
    flex-wrap: wrap;
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
    position: relative;
  }

  .brand {
    margin-right: auto;
  }

  .header-tools {
    margin-left: auto;
  }

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

  .nav-toggle {
    display: flex;
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
  }

  .header-tools {
    margin-right: 48px;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: var(--space-sm) 0;
    border-top: 1px solid var(--color-border);
  }

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

  .nav-list li a {
    padding: 12px 8px;
    font-size: 16px;
    border-radius: var(--radius-sm);
  }

  .tool-link {
    min-height: 40px;
    padding: 0 12px;
    font-size: 13px;
  }

  .inner-main {
    padding: var(--space-md) var(--space-sm) var(--space-xl);
  }

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

  .breadcrumb {
    font-size: 13px;
    margin-bottom: var(--space-md);
  }

  /* 首页 */
  .home-main {
    padding: 0 var(--space-sm);
  }

  .hero-section {
    grid-template-columns: 1fr;
    padding: var(--space-lg) 0;
    gap: var(--space-md);
  }

  .hero-content h1 {
    font-size: 26px;
  }

  .hero-summary {
    font-size: 15px;
  }

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

  .btn {
    width: 100%;
  }

  .featured-card {
    padding: var(--space-md);
    gap: var(--space-md);
  }

  .featured-text h3 {
    font-size: 19px;
  }

  .channel-tag-list {
    gap: 8px;
  }

  .channel-tag {
    padding: 0 16px;
    min-height: 36px;
    font-size: 13px;
  }

  .news-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .news-item img {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: cover;
  }

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

  /* 侧栏布局 */
  .sidebar-left {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .sidebar-left .channel-sidebar,
  .sidebar-left .sidebar {
    grid-column: 1;
    grid-row: auto;
  }

  .sidebar-left .channel-content,
  .sidebar-left .main-content {
    grid-column: 1;
    grid-row: auto;
  }

  /* 频道页 */
  .channel-sidebar {
    order: 2;
  }

  .channel-content {
    order: 1;
  }

  .channel-title {
    font-size: 20px;
  }

  .content-media-inline {
    aspect-ratio: 16 / 9;
  }

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

  .topic-entry-info,
  .topic-collection-note {
    padding: var(--space-md);
  }

  /* 指南页 */
  .sidebar {
    order: 2;
  }

  .main-content {
    order: 1;
  }

  .guide-figure {
    aspect-ratio: 16 / 9;
  }

  /* 深度解读 */
  .insight-card {
    grid-template-columns: 1fr;
  }

  .insight-media {
    aspect-ratio: 16 / 8;
  }

  .method-section {
    padding: var(--space-md);
  }

  /* 页脚 */
  .footer-inner {
    padding: var(--space-lg) var(--space-sm) var(--space-md);
  }

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

  .footer-links {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .back-to-top {
    width: 100%;
  }

  /* 404 */
  .error-main {
    min-height: calc(100vh - var(--header-height) - 360px);
    padding: var(--space-xl) var(--space-sm);
  }

  .error-wrap {
    padding: var(--space-lg) var(--space-md);
  }

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

/* 小屏手机 390px */
@media (max-width: 390px) {
  .brand-name {
    font-size: 17px;
  }

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

  .tool-link {
    padding: 0 10px;
    font-size: 12px;
  }

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

  .section-title {
    font-size: 20px;
  }

  .topic-card-body h3,
  .insight-content h3 {
    font-size: 16px;
  }

  .news-text h3 {
    font-size: 15px;
  }
}