/* ==========================================================================
   悠兔云 (Youtu Cloud) - Newsprint 报纸编排设计系统纯原生样式表
   零重型外部框架依赖 | 100% 原生 CSS | 极速秒开 | 权威 Newsprint 规范
   ========================================================================== */

/* --------------------------------------------------------------------------
   设计系统权威 Token 声明 (Newsprint Design System)
   -------------------------------------------------------------------------- */
:root {
  --dp-color-ground: #f3efe5;
  --dp-color-ink: #191916;
  --dp-color-secondary: #494843;
  --dp-color-rule: #9b978e;
  --dp-color-accent: #a3231d;

  --dp-typography-display: "Newsprint Display", "Source Serif 4", Georgia, "Times New Roman", "Source Han Serif CN", "Songti SC", serif;
  --dp-typography-reading: "Newsprint Reading", "EB Garamond", Garamond, Georgia, "Source Han Serif CN", serif;
  
  --dp-typography-body: 20px;
  --dp-typography-reading-compact: 19px;
  --dp-typography-label: 12px;
  --dp-typography-control: 15px;
  --dp-typography-label-weight: 650;
  --dp-typography-display-weight: 900;
  --dp-typography-body-leading: 1.35;
  --dp-typography-control-leading: 1.2;
  --dp-typography-label-tracking: 0.09em;

  --dp-spacing-column: 24px;
  --dp-spacing-story: 22px;
  --dp-radius-control: 0;
  --dp-border-hairline: 1px;
  --dp-border-section: 4px;
  --dp-border-focus: 2px;
  --dp-motion-transition: none;

  --dp-max-width: 1240px;
}

/* --------------------------------------------------------------------------
   全局重置与版式基础 (CSS Reset & Base Typography)
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-radius: var(--dp-radius-control) !important;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--dp-color-ground);
  color: var(--dp-color-ink);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--dp-typography-reading);
  font-size: var(--dp-typography-reading-compact);
  line-height: 1.6;
  color: var(--dp-color-ink);
  background-color: var(--dp-color-ground);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 无障碍键盘跳转 */
.skip-link {
  position: absolute;
  top: -9999px;
  left: 16px;
  background: var(--dp-color-ink);
  color: var(--dp-color-ground);
  padding: 12px 20px;
  font-family: var(--dp-typography-display);
  font-weight: 700;
  z-index: 99999;
  text-decoration: none;
  border: 1px solid var(--dp-color-ground);
}
.skip-link:focus {
  top: 16px;
  outline: var(--dp-border-focus) solid var(--dp-color-accent);
}

/* 焦点高可见度 */
:focus-visible {
  outline: var(--dp-border-focus) solid var(--dp-color-ink);
  outline-offset: 2px;
}

/* 标题通用规范 */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--dp-typography-display);
  font-weight: var(--dp-typography-display-weight);
  line-height: var(--dp-typography-body-leading);
  color: var(--dp-color-ink);
  letter-spacing: -0.015em;
  scroll-margin-top: 80px;
}

p {
  color: var(--dp-color-secondary);
  margin-bottom: 1rem;
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: var(--dp-motion-transition);
}
a:hover {
  color: var(--dp-color-accent);
}

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

/* 容器布局 */
.container {
  width: 100%;
  max-width: var(--dp-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* --------------------------------------------------------------------------
   报纸顶栏与刊头 (Masthead & Header)
   -------------------------------------------------------------------------- */
.newspaper-meta-strip {
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding: 8px 0;
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: var(--dp-typography-label-weight);
  letter-spacing: var(--dp-typography-label-tracking);
  text-transform: uppercase;
  color: var(--dp-color-secondary);
}

.meta-strip-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}
.meta-accent {
  color: var(--dp-color-accent);
  font-weight: bold;
}

.newspaper-masthead {
  padding: 24px 0 16px 0;
  border-bottom: var(--dp-border-section) solid var(--dp-color-ink);
  text-align: center;
}

.masthead-title-link {
  text-decoration: none;
  display: inline-block;
}

.masthead-title {
  font-family: var(--dp-typography-display);
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--dp-color-ink);
  margin: 0;
}

.masthead-subtitle {
  font-family: var(--dp-typography-reading);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--dp-color-secondary);
  margin-top: 6px;
  margin-bottom: 0;
}

/* 报纸导航栏 */
.newspaper-nav {
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  background: var(--dp-color-ground);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  gap: 16px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
}

.nav-link {
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-control);
  font-weight: 700;
  text-decoration: none;
  color: var(--dp-color-ink);
  padding: 6px 4px;
  border-bottom: 2px solid transparent;
}
.nav-link:hover, .nav-link.active {
  color: var(--dp-color-accent);
  border-bottom-color: var(--dp-color-accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* --------------------------------------------------------------------------
   标准方块交互组件 (Newsprint Buttons & Controls)
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-control);
  font-weight: 700;
  line-height: var(--dp-typography-control-leading);
  padding: 10px 20px;
  min-height: 44px;
  min-width: 44px;
  text-decoration: none;
  cursor: pointer;
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  background-color: transparent;
  color: var(--dp-color-ink);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  transition: var(--dp-motion-transition);
}

.btn:hover {
  background-color: var(--dp-color-ink);
  color: var(--dp-color-ground);
}

.btn-primary {
  background-color: var(--dp-color-ink);
  color: var(--dp-color-ground);
}
.btn-primary:hover {
  background-color: var(--dp-color-accent);
  border-color: var(--dp-color-accent);
  color: #ffffff;
}

.btn-accent {
  background-color: var(--dp-color-accent);
  border-color: var(--dp-color-accent);
  color: #ffffff;
}
.btn-accent:hover {
  background-color: var(--dp-color-ink);
  border-color: var(--dp-color-ink);
  color: var(--dp-color-ground);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
  min-height: 38px;
}

/* 标签与印记 */
.newsprint-tag {
  display: inline-block;
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: var(--dp-typography-label-weight);
  letter-spacing: var(--dp-typography-label-tracking);
  text-transform: uppercase;
  padding: 2px 6px;
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  background: transparent;
  color: var(--dp-color-ink);
}

.newsprint-tag-accent {
  background: var(--dp-color-accent);
  border-color: var(--dp-color-accent);
  color: #ffffff;
}

/* --------------------------------------------------------------------------
   头条与首版布局 (Lead Story & 3:1 Editorial Split)
   -------------------------------------------------------------------------- */
.lead-story-section {
  padding: 36px 0 28px 0;
  border-bottom: var(--dp-border-section) solid var(--dp-color-ink);
}

.lead-spread {
  display: grid;
  grid-template-columns: 2.8fr 1.2fr;
  gap: var(--dp-spacing-column);
  align-items: stretch;
}

.lead-main {
  padding-right: var(--dp-spacing-column);
  border-right: var(--dp-border-hairline) solid var(--dp-color-rule);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.lead-kicker {
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: var(--dp-typography-label-weight);
  letter-spacing: var(--dp-typography-label-tracking);
  text-transform: uppercase;
  color: var(--dp-color-accent);
  margin-bottom: 8px;
}

.lead-headline {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 900;
  line-height: 1.12;
  margin-bottom: 16px;
  color: var(--dp-color-ink);
}

.lead-deck {
  font-family: var(--dp-typography-reading);
  font-size: 1.28rem;
  line-height: 1.45;
  color: var(--dp-color-ink);
  margin-bottom: 20px;
  font-weight: 500;
}

.lead-prose {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--dp-color-secondary);
}

.lead-prose .drop-cap {
  float: left;
  font-family: var(--dp-typography-display);
  font-size: 3.8rem;
  line-height: 0.8;
  padding-top: 4px;
  padding-right: 12px;
  padding-bottom: 2px;
  color: var(--dp-color-ink);
  font-weight: 900;
}

.lead-side {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 20px;
}

.dispatch-box {
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  padding: 20px;
  background-color: rgba(25, 25, 22, 0.03);
}

.dispatch-header {
  font-family: var(--dp-typography-display);
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-bottom: 8px;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.dispatch-list {
  list-style: none;
}

.dispatch-list li {
  padding: 8px 0;
  border-bottom: var(--dp-border-hairline) dashed var(--dp-color-rule);
  font-size: 0.92rem;
  color: var(--dp-color-secondary);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.dispatch-list li:last-child {
  border-bottom: none;
}
.dispatch-list strong {
  color: var(--dp-color-ink);
}

.side-cta-card {
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  padding: 20px;
  background: var(--dp-color-ground);
  text-align: center;
}

.side-cta-card h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.side-cta-card p {
  font-size: 0.95rem;
  margin-bottom: 16px;
}

/* 事实数据横条 (Compact Factual Strip) */
.factual-strip {
  border-bottom: var(--dp-border-section) solid var(--dp-color-ink);
  padding: 18px 0;
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.fact-item {
  border-right: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-right: 16px;
}
.fact-item:last-child {
  border-right: none;
  padding-right: 0;
}

.fact-value {
  font-family: var(--dp-typography-display);
  font-size: 1.9rem;
  font-weight: 900;
  line-height: 1;
  color: var(--dp-color-ink);
  margin-bottom: 4px;
}
.fact-value .unit {
  font-size: 1.1rem;
  color: var(--dp-color-accent);
}

.fact-label {
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: var(--dp-typography-label-weight);
  letter-spacing: var(--dp-typography-label-tracking);
  text-transform: uppercase;
  color: var(--dp-color-secondary);
}

/* --------------------------------------------------------------------------
   板块通用版式与分栏 (Section Layout & Multi-column Grid)
   -------------------------------------------------------------------------- */
.newspaper-section {
  padding: 40px 0;
  border-bottom: var(--dp-border-section) solid var(--dp-color-ink);
}

.section-mast {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-bottom: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}

.section-number {
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: 800;
  letter-spacing: var(--dp-typography-label-tracking);
  color: var(--dp-color-accent);
  text-transform: uppercase;
}

.section-title {
  font-size: 2rem;
  font-weight: 900;
}

.section-desc {
  font-family: var(--dp-typography-reading);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--dp-color-secondary);
}

/* 3图文核心优势栏 */
.features-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

.feature-column {
  padding: 0 var(--dp-spacing-column);
  border-right: var(--dp-border-hairline) solid var(--dp-color-rule);
  display: flex;
  flex-direction: column;
}
.feature-column:first-child {
  padding-left: 0;
}
.feature-column:last-child {
  border-right: none;
  padding-right: 0;
}

.feature-kicker {
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: 800;
  color: var(--dp-color-accent);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.feature-title {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.feature-visual {
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  background: rgba(25, 25, 22, 0.04);
  padding: 16px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 120px;
}
.feature-visual svg {
  stroke: var(--dp-color-ink);
}

.feature-body {
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--dp-color-secondary);
  flex-grow: 1;
}

/* --------------------------------------------------------------------------
   流媒体与 AI 支持图卡 (Media & AI Spread)
   -------------------------------------------------------------------------- */
.support-spread {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--dp-spacing-column);
}

.support-block {
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  padding: 24px;
}

.support-block-header {
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-bottom: 12px;
  margin-bottom: 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.support-block-title {
  font-size: 1.35rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.support-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.support-item {
  border: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding: 12px;
  background: rgba(25, 25, 22, 0.02);
}

.support-item-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.support-name {
  font-family: var(--dp-typography-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--dp-color-ink);
}

.support-item p {
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--dp-color-secondary);
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   套餐价格对比表 (Pricing Comparison Listing)
   -------------------------------------------------------------------------- */
.pricing-container {
  overflow-x: auto;
  margin-bottom: 24px;
  -webkit-overflow-scrolling: touch;
}

.pricing-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
}

.pricing-table th,
.pricing-table td {
  padding: 16px 20px;
  border: var(--dp-border-hairline) solid var(--dp-color-rule);
  vertical-align: middle;
}

.pricing-table th {
  background: var(--dp-color-ink);
  color: var(--dp-color-ground);
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-control);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-table tbody tr {
  background: var(--dp-color-ground);
}
.pricing-table tbody tr:hover {
  background: rgba(25, 25, 22, 0.03);
}

.pricing-table tr.featured-row {
  outline: 2px solid var(--dp-color-accent);
  background: rgba(163, 35, 29, 0.04);
}

.tier-name {
  font-family: var(--dp-typography-display);
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--dp-color-ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.price-box {
  font-family: var(--dp-typography-display);
}
.price-currency {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dp-color-accent);
}
.price-amount {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  color: var(--dp-color-ink);
}
.price-period {
  font-size: 0.9rem;
  color: var(--dp-color-secondary);
}

.pricing-features-list {
  list-style: none;
  font-size: 0.92rem;
  color: var(--dp-color-secondary);
}
.pricing-features-list li {
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.pricing-features-list li::before {
  content: "—";
  color: var(--dp-color-accent);
}

/* --------------------------------------------------------------------------
   用户口碑评价 (Customer Reviews / Dispatches)
   -------------------------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--dp-spacing-column);
}

.review-item {
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-quote {
  font-family: var(--dp-typography-reading);
  font-style: italic;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--dp-color-ink);
  margin-bottom: 16px;
}

.review-author {
  border-top: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-top: 12px;
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--dp-color-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.review-rating {
  color: var(--dp-color-accent);
}

/* --------------------------------------------------------------------------
   常见问题解答 (Ruled Question Rows & Native Disclosures)
   -------------------------------------------------------------------------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: var(--dp-border-hairline) solid var(--dp-color-ink);
}

.faq-item {
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-ink);
  padding: 16px 0;
}

.faq-summary {
  font-family: var(--dp-typography-display);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--dp-color-ink);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}
.faq-summary::-webkit-details-marker {
  display: none;
}
.faq-indicator {
  font-family: monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--dp-color-accent);
  margin-left: 16px;
}

.faq-item[open] .faq-indicator::before {
  content: "−";
}
.faq-item:not([open]) .faq-indicator::before {
  content: "+";
}

.faq-content {
  padding-top: 14px;
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--dp-color-secondary);
}

/* --------------------------------------------------------------------------
   文章专栏与独立文章页排版 (Knowledge Hub & Article Styles)
   -------------------------------------------------------------------------- */
.articles-index-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--dp-spacing-column);
}

.article-card {
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  padding: 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  background: var(--dp-color-ground);
}
.article-card:hover {
  background: rgba(25, 25, 22, 0.03);
}

.article-card-header {
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-bottom: 8px;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: 700;
  color: var(--dp-color-secondary);
}

.article-card-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
  line-height: 1.35;
  color: var(--dp-color-ink);
}

.article-card-desc {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--dp-color-secondary);
  margin-bottom: 16px;
  flex-grow: 1;
}

.article-card-meta {
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: 700;
  color: var(--dp-color-accent);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* 独立文章阅读页排版 */
.article-single-sheet {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 0;
}

.article-header {
  border-bottom: var(--dp-border-section) solid var(--dp-color-ink);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.article-meta-line {
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-label);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--dp-color-accent);
  text-transform: uppercase;
  margin-bottom: 12px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.article-single-title {
  font-size: clamp(2rem, 3.8vw, 3rem);
  line-height: 1.18;
  margin-bottom: 16px;
}

.article-lead-paragraph {
  font-family: var(--dp-typography-reading);
  font-size: 1.2rem;
  font-style: italic;
  line-height: 1.55;
  color: var(--dp-color-secondary);
  border-left: 3px solid var(--dp-color-accent);
  padding-left: 16px;
  margin-bottom: 0;
}

.article-content {
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--dp-color-ink);
}

.article-content h2 {
  font-size: 1.6rem;
  margin-top: 36px;
  margin-bottom: 14px;
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-bottom: 8px;
}

.article-content h3 {
  font-size: 1.3rem;
  margin-top: 24px;
  margin-bottom: 10px;
}

.article-content ul, .article-content ol {
  margin-left: 24px;
  margin-bottom: 18px;
}

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

.article-content blockquote {
  border-left: 4px solid var(--dp-color-ink);
  padding: 12px 20px;
  background: rgba(25, 25, 22, 0.03);
  margin: 20px 0;
  font-style: italic;
}

.article-footer-cta {
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  background: var(--dp-color-ground);
  padding: 28px;
  margin-top: 40px;
  text-align: center;
}

/* --------------------------------------------------------------------------
   网站地图、条款与政策页通用排版
   -------------------------------------------------------------------------- */
.policy-sheet {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 0;
}

.sitemap-columns {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--dp-spacing-column);
  margin-top: 24px;
}

.sitemap-group {
  border: var(--dp-border-hairline) solid var(--dp-color-ink);
  padding: 20px;
}

.sitemap-group-title {
  font-family: var(--dp-typography-display);
  font-size: 1.15rem;
  font-weight: 800;
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-bottom: 8px;
  margin-bottom: 12px;
}

.sitemap-list {
  list-style: none;
}
.sitemap-list li {
  margin-bottom: 10px;
  font-size: 0.95rem;
}
.sitemap-list a {
  text-decoration: none;
  color: var(--dp-color-ink);
  border-bottom: 1px dotted var(--dp-color-rule);
}
.sitemap-list a:hover {
  color: var(--dp-color-accent);
  border-bottom-color: var(--dp-color-accent);
}

/* --------------------------------------------------------------------------
   报纸目录页脚 (Strict 4-Link Directory Footer)
   -------------------------------------------------------------------------- */
.newspaper-footer {
  margin-top: auto;
  border-top: var(--dp-border-section) solid var(--dp-color-ink);
  padding: 32px 0 40px 0;
  background-color: var(--dp-color-ground);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  padding-bottom: 24px;
  margin-bottom: 24px;
}

.footer-brand {
  font-family: var(--dp-typography-display);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--dp-color-ink);
}

.footer-directory {
  display: flex;
  list-style: none;
  gap: 32px;
  flex-wrap: wrap;
}

.footer-directory-link {
  font-family: var(--dp-typography-display);
  font-size: var(--dp-typography-control);
  font-weight: 700;
  text-decoration: none;
  color: var(--dp-color-ink);
  border-bottom: 1px solid transparent;
  padding: 4px 0;
}
.footer-directory-link:hover {
  color: var(--dp-color-accent);
  border-bottom-color: var(--dp-color-accent);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: var(--dp-typography-label);
  color: var(--dp-color-secondary);
}

/* --------------------------------------------------------------------------
   响应式媒体查询适配 (@media)
   -------------------------------------------------------------------------- */
@media (max-width: 1100px) {
  .lead-spread {
    grid-template-columns: 2.2fr 1.3fr;
  }
  .features-columns {
    grid-template-columns: repeat(3, 1fr);
  }
  .articles-index-grid,
  .reviews-grid,
  .sitemap-columns {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --dp-typography-reading-compact: 17px;
  }

  .nav-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav-menu {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
    gap: 12px;
  }
  .nav-actions {
    width: 100%;
    margin-top: 8px;
  }
  .nav-actions .btn {
    width: 100%;
  }

  .lead-spread {
    grid-template-columns: 1fr;
  }
  .lead-main {
    padding-right: 0;
    border-right: none;
    border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
    padding-bottom: 24px;
  }

  .facts-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .fact-item:nth-child(2) {
    border-right: none;
  }

  .features-columns {
    grid-template-columns: 1fr;
  }
  .feature-column {
    padding: 20px 0;
    border-right: none;
    border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
  }
  .feature-column:last-child {
    border-bottom: none;
  }

  .support-spread {
    grid-template-columns: 1fr;
  }

  .reviews-grid,
  .articles-index-grid,
  .sitemap-columns {
    grid-template-columns: 1fr;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-directory {
    gap: 16px;
    flex-direction: column;
  }
}

@media (max-width: 360px) {
  .container {
    padding-left: 14px;
    padding-right: 14px;
  }
  .masthead-title {
    font-size: 2.1rem;
  }
  .facts-grid {
    grid-template-columns: 1fr;
  }
  .fact-item {
    border-right: none;
    border-bottom: var(--dp-border-hairline) solid var(--dp-color-rule);
    padding-bottom: 12px;
  }
}

/* 尊重减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}