/* ==========================================================================
   BoostNet 科技评测媒体设计系统 (Editorial Design System)
   色彩规范:
   主背景: #FAFAF7
   纯白: #FFFFFF
   纸张浅灰: #F1EFEA
   主文字: #171717
   正文: #454744
   次级: #777A76
   科技蓝: #284B63
   编辑红: #A5483B
   沉静绿: #657568
   边框: #DDD9D1
   页脚浅灰: #ECE9E2
   ========================================================================== */

:root {
  --bg-main: #FAFAF7;
  --bg-white: #FFFFFF;
  --bg-paper: #F1EFEA;
  --text-main: #171717;
  --text-body: #454744;
  --text-muted: #777A76;
  --color-blue: #284B63;
  --color-red: #A5483B;
  --color-green: #657568;
  --border-color: #DDD9D1;
  --border-light: #ECE9E2;
  --footer-bg: #ECE9E2;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  
  --max-width: 1200px;
  --article-width: 780px;
  --header-height: 72px;
  --radius-sm: 3px;
  --radius-md: 6px;
  --transition: all 0.2s ease-in-out;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-body);
  font-family: var(--font-sans);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 链接规范 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

/* 图片防溢出与空图保护 */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* 容器规范 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.article-container {
  width: 100%;
  max-width: var(--article-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 编辑部顶条 */
.top-bar {
  background-color: var(--bg-paper);
  border-bottom: 1px solid var(--border-color);
  font-size: 13px;
  color: var(--text-muted);
  padding: 6px 0;
}

.top-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-bar-notice {
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-bar-badge {
  background-color: var(--color-red);
  color: #fff;
  padding: 1px 6px;
  font-size: 11px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.top-bar-links {
  display: flex;
  gap: 16px;
}

.top-bar-links a:hover {
  color: var(--text-main);
}

/* 顶部导航 Header */
.site-header {
  background-color: var(--bg-main);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background-color: rgba(250, 250, 247, 0.96);
}

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

.logo-group {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.site-logo {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.site-tagline {
  font-size: 12px;
  color: var(--text-muted);
  border-left: 1px solid var(--border-color);
  padding-left: 8px;
  display: none;
}

@media (min-width: 1080px) {
  .site-tagline {
    display: inline-block;
  }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 14px;
  color: var(--text-main);
  font-weight: 500;
  padding: 8px 0;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-blue);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-blue);
}

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.cta-button-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--color-blue);
  color: #ffffff !important;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-blue);
  box-shadow: 0 1px 2px rgba(40, 75, 99, 0.15);
  transition: var(--transition);
}

.cta-button-primary:hover {
  background-color: #1f3a4e;
  border-color: #1f3a4e;
  color: #ffffff;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 14px;
  color: var(--text-main);
  cursor: pointer;
}

/* 移动端菜单抽屉 */
.mobile-nav-drawer {
  display: none;
  background-color: var(--bg-paper);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 24px 24px;
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.mobile-nav-links a {
  font-size: 15px;
  color: var(--text-main);
  padding: 6px 0;
  border-bottom: 1px solid var(--border-color);
}

/* 编辑部模块通用标题 */
.section-header-editorial {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 2px solid var(--text-main);
  padding-bottom: 10px;
  margin-bottom: 28px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-red);
}

.section-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
}

.section-more-link {
  font-size: 13px;
  color: var(--color-blue);
  font-weight: 500;
}

.section-more-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   一、本期头条 (Cover Story) - 替代普通 Hero
   ========================================================================== */
.headline-section {
  padding: 36px 0 44px;
  border-bottom: 1px solid var(--border-color);
}

.headline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 992px) {
  .headline-grid {
    grid-template-columns: 2fr 1fr;
    gap: 40px;
  }
}

.headline-main-col {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.issue-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-red);
  letter-spacing: 0.05em;
  margin-bottom: 12px;
  background-color: var(--bg-paper);
  border: 1px solid var(--border-color);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  width: fit-content;
}

.headline-title {
  font-family: var(--font-serif);
  font-size: 32px;
  line-height: 1.35;
  color: var(--text-main);
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .headline-title {
    font-size: 38px;
  }
}

.headline-summary {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 24px;
  background-color: var(--bg-white);
  padding: 20px 24px;
  border-left: 3px solid var(--color-blue);
  border-top: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.headline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.headline-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.headline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn-editorial-read {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--text-main);
  color: #fff !important;
  font-size: 15px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn-editorial-read:hover {
  background-color: var(--color-blue);
}

.btn-editorial-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: transparent;
  color: var(--text-main) !important;
  font-size: 15px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.btn-editorial-outline:hover {
  background-color: var(--bg-paper);
  border-color: var(--text-main);
}

/* 编辑式快速信息栏 (Not Card) */
.quick-info-sidebar {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-color);
  padding: 24px;
}

.quick-info-header {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quick-info-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.quick-info-item {
  display: flex;
  flex-direction: column;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border-color);
}

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

.quick-info-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 3px;
}

.quick-info-value {
  font-size: 14px;
  color: var(--text-main);
  font-weight: 600;
}

/* ==========================================================================
   二、编辑精选 (Editor's Picks: 1 Lead + 2 Side)
   ========================================================================== */
.picks-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

.picks-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 992px) {
  .picks-grid {
    grid-template-columns: 1.6fr 1fr;
    gap: 36px;
  }
}

.lead-pick {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.lead-pick-tag {
  color: var(--color-red);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.lead-pick-title {
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 14px;
}

.lead-pick-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 20px;
}

.side-picks {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.side-pick-item {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 20px;
}

.side-pick-tag {
  color: var(--color-blue);
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 6px;
}

.side-pick-title {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 8px;
}

.side-pick-desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.editorial-link-inline {
  font-size: 13px;
  color: var(--color-blue);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.editorial-link-inline:hover {
  text-decoration: underline;
}

/* ==========================================================================
   三、BoostNet 核心信息 (Two-column editorial layout)
   ========================================================================== */
.core-info-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

.editorial-two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 860px) {
  .editorial-two-col {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

.editorial-col {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 28px;
}

.editorial-col h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--text-main);
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 8px;
}

.editorial-col p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 14px;
}

.editorial-col p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   四、三网 IEPL 专题与真实 HTML 对比表
   ========================================================================== */
.iepl-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

.direct-answer-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-main);
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.editorial-table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
}

.editorial-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 14px;
}

.editorial-table th {
  background-color: var(--bg-paper);
  color: var(--text-main);
  font-weight: 700;
  padding: 14px 18px;
  border-bottom: 2px solid var(--border-color);
}

.editorial-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-body);
  vertical-align: top;
  line-height: 1.65;
}

.editorial-table tr:last-child td {
  border-bottom: none;
}

.editorial-table tr:nth-child(even) td {
  background-color: #FCFCFA;
}

.table-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.table-tag-blue {
  background-color: rgba(40, 75, 99, 0.1);
  color: var(--color-blue);
}

.table-tag-amber {
  background-color: rgba(165, 72, 59, 0.1);
  color: var(--color-red);
}

/* ==========================================================================
   五、跨网提醒与长期观察
   ========================================================================== */
.note-observation-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin: 32px 0 0;
}

@media (min-width: 860px) {
  .note-observation-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.editorial-alert-box {
  background-color: #FFFDF9;
  border: 1px solid #EADBCC;
  border-left: 4px solid var(--color-red);
  padding: 22px 24px;
}

.editorial-alert-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-red);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.editorial-alert-text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-body);
}

.observation-box {
  background-color: #F8FAF9;
  border: 1px solid #D5DDD7;
  border-left: 4px solid var(--color-green);
  padding: 22px 24px;
}

.observation-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-green);
  margin-bottom: 12px;
}

.observation-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
}

.observation-item {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed #D5DDD7;
  padding-bottom: 6px;
}

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

.observation-item strong {
  color: var(--text-main);
}

/* ==========================================================================
   六、客户端专题
   ========================================================================== */
.client-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

.client-editorial-box {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 28px;
}

.client-editorial-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-main);
  margin-bottom: 18px;
}

.client-platforms {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 20px 0;
}

.client-platform-card {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-color);
  padding: 16px 20px;
}

.client-platform-name {
  font-weight: 700;
  color: var(--text-main);
  font-size: 15px;
  margin-bottom: 4px;
}

.client-platform-desc {
  font-size: 13px;
  color: var(--text-muted);
}

/* ==========================================================================
   七、套餐购买指南 (媒体式 UI: 左侧选择建议 + 右侧价格与流量表)
   ========================================================================== */
.pricing-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

.pricing-media-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 28px;
}

@media (min-width: 960px) {
  .pricing-media-layout {
    grid-template-columns: 1fr 1.6fr;
    gap: 40px;
  }
}

.pricing-advice-col {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-color);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.advice-title {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--text-main);
  font-weight: 700;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

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

.advice-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.advice-user {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-blue);
}

.advice-match {
  font-size: 15px;
  color: var(--text-main);
  font-weight: 600;
}

.advice-desc {
  font-size: 13px;
  color: var(--text-muted);
}

.pricing-table-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.plan-row-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-items: center;
  position: relative;
  transition: var(--transition);
}

@media (min-width: 600px) {
  .plan-row-card {
    grid-template-columns: 1.2fr 1fr auto;
  }
}

.plan-row-card:hover {
  border-color: var(--color-blue);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.plan-row-card.highlight {
  border: 2px solid var(--color-blue);
  background-color: #FCFDFE;
}

.plan-badge-rec {
  position: absolute;
  top: -10px;
  right: 20px;
  background-color: var(--color-blue);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.plan-info-main h4 {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--text-main);
  margin-bottom: 4px;
}

.plan-traffic {
  font-size: 13px;
  color: var(--text-muted);
}

.plan-price-group {
  display: flex;
  flex-direction: column;
}

.plan-price-large {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--font-sans);
}

.plan-price-cycle {
  font-size: 12px;
  color: var(--text-muted);
}

/* 历史套餐说明框 */
.historical-plan-notice {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-color);
  padding: 20px 24px;
  margin-top: 20px;
}

.historical-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.historical-body {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-body);
}

.historical-disclaimer {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 8px;
  border-top: 1px dashed var(--border-color);
  padding-top: 6px;
}

/* ==========================================================================
   八、AI 与流媒体使用指南
   ========================================================================== */
.media-ai-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

.service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

@media (min-width: 768px) {
  .service-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.service-box {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 28px;
}

.service-box h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--text-main);
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 8px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.service-tag {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-color);
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
  border-radius: var(--radius-sm);
}

.service-box p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-body);
}

/* ==========================================================================
   九、首页内容中心 (深度文章: 1 头条 + 2 重点 + 3 教程 + 3 快速阅读)
   ========================================================================== */
.articles-center-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

/* 1 篇重点大稿 */
.hub-lead-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 32px;
  margin-bottom: 32px;
}

.hub-lead-category {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-red);
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.hub-lead-title {
  font-family: var(--font-serif);
  font-size: 26px;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 12px;
}

.hub-lead-excerpt {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-body);
  margin-bottom: 18px;
}

/* 2 篇重点文章 */
.hub-two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

@media (min-width: 768px) {
  .hub-two-col {
    grid-template-columns: 1fr 1fr;
  }
}

.hub-medium-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 24px;
}

.hub-card-category {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-blue);
  margin-bottom: 6px;
}

.hub-medium-title {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 10px;
}

.hub-medium-excerpt {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* 3 篇教程 */
.hub-three-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-bottom: 32px;
}

@media (min-width: 860px) {
  .hub-three-col {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.hub-tutorial-card {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-color);
  padding: 20px;
}

.hub-tutorial-title {
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.45;
  color: var(--text-main);
  margin-bottom: 8px;
}

.hub-tutorial-excerpt {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* 3 篇快速阅读 (列表样式) */
.hub-quick-reads {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 24px;
}

.quick-reads-heading {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 8px;
}

.quick-reads-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.quick-read-item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 10px;
}

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

.quick-read-link {
  font-size: 14.5px;
  color: var(--text-main);
  font-weight: 500;
}

.quick-read-link:hover {
  color: var(--color-blue);
  text-decoration: underline;
}

.quick-read-date {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  margin-left: 12px;
}

/* ==========================================================================
   十、常见问题 FAQ
   ========================================================================== */
.faq-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--border-color);
}

.faq-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 18px 22px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-icon {
  font-size: 16px;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 22px 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-body);
  border-top: 1px solid var(--border-light);
  padding-top: 14px;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ==========================================================================
   十一、浅色媒体 Footer
   背景: #ECE9E2
   高度/内边距: 250-320px
   ========================================================================== */
.site-footer {
  background-color: var(--footer-bg);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
  color: var(--text-body);
  font-size: 13.5px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  margin-bottom: 36px;
}

@media (min-width: 860px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  }
}

.footer-col h4 {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 6px;
}

.footer-brand-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  color: var(--text-body);
}

.footer-links a:hover {
  color: var(--color-blue);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 12.5px;
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* ==========================================================================
   十二、文章页专属排版 (720-820px 中文深度文章阅读器)
   ========================================================================== */
.article-header {
  padding: 44px 0 28px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 36px;
}

.breadcrumb-nav {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

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

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

.article-h1 {
  font-family: var(--font-serif);
  font-size: 34px;
  line-height: 1.35;
  color: var(--text-main);
  font-weight: 700;
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  .article-h1 {
    font-size: 42px;
  }
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  background-color: var(--bg-paper);
  border: 1px solid var(--border-color);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
}

.article-meta-cell {
  display: flex;
  align-items: center;
  gap: 4px;
}

.article-content {
  font-size: 16.5px;
  line-height: 1.9;
  color: var(--text-body);
}

.article-content p {
  margin-bottom: 22px;
  text-align: justify;
}

.article-content h2 {
  font-family: var(--font-serif);
  font-size: 24px;
  color: var(--text-main);
  margin: 44px 0 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
  line-height: 1.4;
}

.article-content h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--text-main);
  margin: 32px 0 12px;
}

.article-content ul,
.article-content ol {
  margin: 0 0 24px 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content blockquote {
  background-color: var(--bg-paper);
  border-left: 4px solid var(--color-blue);
  padding: 18px 24px;
  margin: 28px 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-main);
}

.user-original-quote {
  background-color: #FFFDF9;
  border: 1px solid #E4DFD3;
  border-left: 4px solid var(--color-red);
  padding: 24px;
  margin: 32px 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-main);
}

.quote-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-red);
  margin-bottom: 10px;
}

.article-cta-box {
  background-color: var(--bg-paper);
  border: 2px solid var(--color-blue);
  padding: 28px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.article-cta-desc {
  font-size: 14.5px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* 栏目页专属 (Category Pages) */
.category-header {
  padding: 44px 0 32px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 36px;
}

.category-title {
  font-family: var(--font-serif);
  font-size: 32px;
  color: var(--text-main);
  font-weight: 700;
  margin-bottom: 14px;
}

.category-desc {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--text-body);
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 20px 24px;
}

.category-articles-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 48px;
}

.category-article-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.category-article-card:hover {
  border-color: var(--color-blue);
}

.category-article-title {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--text-main);
}

.category-article-excerpt {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-body);
}

.category-article-meta {
  font-size: 12.5px;
  color: var(--text-muted);
  display: flex;
  gap: 16px;
}

/* 移动端适配响应式 */
@media (max-width: 991px) {
  .site-nav {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
  }
}