/* ==========================================================================
   大哥云 (DAGGE YUN) - 极简极速原生样式表
   视觉风格：白瓷白背景 (#FFFFFF) | 极细发丝线边框 (#E5E7EB) | 纯粹排版
   交互焦点：可信赖钴蓝 (#2563EB) | 微抬升软阴影 | 零花哨渐变与剪贴画
   ========================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* 白瓷亮色主题 (默认) */
  --bg-page: #ffffff;
  --bg-subtle: #f4f5f7;
  --bg-card: #ffffff;
  --bg-hover: #f8fafc;
  --bg-input: #ffffff;

  --border-light: #e5e7eb;
  --border-focus: #2563eb;
  --border-dark: #cbd5e1;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  --text-inverse: #ffffff;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-subtle: #eff6ff;

  --status-good: #059669;
  --status-good-bg: #ecfdf5;

  --shadow-flat: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-elevated: 0 12px 24px -4px rgba(15, 23, 42, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-nav: 0 1px 0 0 #e5e7eb;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --transition-normal: 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  /* 极简深色主题（同样遵循纯粹高质感排版，无浮夸渐变） */
  --bg-page: #0b0f17;
  --bg-subtle: #111827;
  --bg-card: #111827;
  --bg-hover: #182235;
  --bg-input: #0b0f17;

  --border-light: #1f2937;
  --border-focus: #3b82f6;
  --border-dark: #374151;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #0b0f17;

  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-subtle: rgba(59, 130, 246, 0.12);

  --status-good: #10b981;
  --status-good-bg: rgba(16, 185, 129, 0.12);

  --shadow-flat: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-elevated: 0 14px 28px -4px rgba(0, 0, 0, 0.5), 0 4px 8px -2px rgba(0, 0, 0, 0.3);
  --shadow-nav: 0 1px 0 0 #1f2937;
}

/* 全局重置与平滑滚动 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --------------------------------------------------------------------------
   页眉与导航目录 (Header & Nav)
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-page);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-nav);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.brand-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.brand-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  color: var(--text-muted);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.brand-title span {
  color: var(--primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.35rem 0.2rem;
  transition: color var(--transition-normal);
  position: relative;
}

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

.nav-link-badge {
  font-size: 0.65rem;
  font-weight: 600;
  background: var(--primary-subtle);
  color: var(--primary);
  border: 1px solid var(--border-light);
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-sm);
  margin-left: 0.25rem;
  vertical-align: middle;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* 精致专业化透明昼夜模式切换按钮 */
.theme-switch-btn {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background-color: transparent;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.theme-switch-btn:hover {
  background-color: var(--bg-subtle);
  color: var(--text-main);
  border-color: var(--border-dark);
}

.theme-switch-btn svg {
  width: 1.15rem;
  height: 1.15rem;
  stroke-width: 1.75;
}

.theme-switch-btn .icon-sun {
  display: none;
}
.theme-switch-btn .icon-moon {
  display: block;
}

[data-theme="dark"] .theme-switch-btn .icon-sun {
  display: block;
}
[data-theme="dark"] .theme-switch-btn .icon-moon {
  display: none;
}

.btn-nav-cta {
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  background-color: var(--primary);
  color: #ffffff !important;
  border: 1px solid var(--primary);
  transition: background-color var(--transition-normal);
  white-space: nowrap;
}

.btn-nav-cta:hover {
  background-color: var(--primary-hover);
}

/* --------------------------------------------------------------------------
   主视觉区 (Hero Section - 非对称双列布局)
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 4.5rem 0 4rem;
  border-bottom: 1px solid var(--border-light);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

/* 左列：品牌名标题、价值主张、输入框样式快捷开始 */
.hero-left {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-tagline-box {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: flex-start;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--text-muted);
}

.hero-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--status-good);
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.035em;
  color: var(--text-main);
}

.hero-title .brand-name-highlight {
  color: var(--primary);
}

.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--text-muted);
  max-width: 580px;
}

/* 输入框样式快捷开始组件 (Input-Style Quick Start CTA) */
.quick-start-form {
  margin-top: 0.5rem;
  max-width: 520px;
}

.quick-start-box {
  display: flex;
  align-items: center;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  background-color: var(--bg-input);
  padding: 0.25rem;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.quick-start-box:focus-within {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 1px var(--border-focus);
}

.quick-start-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  color: var(--text-main);
  outline: none;
  font-family: inherit;
}

.quick-start-input::placeholder {
  color: var(--text-dim);
}

.quick-start-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.35rem;
  background-color: var(--primary);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.925rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color var(--transition-normal);
}

.quick-start-btn:hover {
  background-color: var(--primary-hover);
}

.hero-guarantees {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.hero-guarantee-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* 右列：悬浮实时节点状态卡片 (Live Server Status Card) */
.hero-right {
  position: relative;
}

.server-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-elevated);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.server-card-header {
  padding: 1rem 1.25rem;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.server-card-title {
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-main);
}

.server-card-pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--status-good);
  background-color: var(--status-good-bg);
  border: 1px solid rgba(5, 150, 105, 0.2);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* 交互式实时节点状态表格 */
.server-table {
  width: 100%;
  border-collapse: collapse;
}

.server-table th {
  text-align: left;
  font-size: 0.725rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-card);
}

.server-row {
  cursor: pointer;
  border-bottom: 1px solid var(--border-light);
  transition: background-color var(--transition-normal);
}

.server-row:last-child {
  border-bottom: none;
}

.server-row:hover {
  background-color: var(--bg-hover);
}

.server-cell {
  padding: 0.85rem 1.25rem;
  font-size: 0.85rem;
  vertical-align: middle;
}

.server-name-box {
  display: flex;
  flex-direction: column;
}

.server-name {
  font-weight: 600;
  color: var(--text-main);
}

.server-route {
  font-size: 0.725rem;
  color: var(--text-dim);
}

.server-ping {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-main);
}

.server-uptime {
  font-family: var(--font-mono);
  color: var(--status-good);
  font-weight: 600;
  font-size: 0.8rem;
}

/* 悬停展开的24小时稳定性走势图 (Inline Sparkline) */
.server-sparkline-row {
  display: none;
  background-color: var(--bg-hover);
  border-bottom: 1px solid var(--border-light);
  padding: 0.5rem 1.25rem 0.85rem;
}

.server-row:hover + .server-sparkline-row,
.server-sparkline-row:hover {
  display: table-row;
}

.sparkline-content {
  padding: 0.5rem 1.25rem 0.85rem;
}

.sparkline-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.725rem;
  color: var(--text-dim);
  margin-bottom: 0.35rem;
}

.sparkline-svg {
  width: 100%;
  height: 28px;
  stroke: var(--primary);
  stroke-width: 1.5;
  fill: none;
}

/* --------------------------------------------------------------------------
   板块通用架构 (Sections)
   -------------------------------------------------------------------------- */
.section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--border-light);
}

.section-subtle {
  background-color: var(--bg-subtle);
}

.section-head {
  margin-bottom: 3rem;
  max-width: 680px;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.125rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.section-intro {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   微抬升卡片 (Micro-Elevated Cards)
   规范：默认平面 1px 细边框，光标悬浮平滑提升 4px 并散开柔和阴影
   -------------------------------------------------------------------------- */
.card-elevate {
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.card-elevate:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-elevated);
  border-color: var(--border-dark);
}

/* --------------------------------------------------------------------------
   产品核心优势介绍 (3个图文卡片)
   -------------------------------------------------------------------------- */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.advantage-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 1rem;
}

.advantage-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.advantage-desc {
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.advantage-meta {
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
}

/* --------------------------------------------------------------------------
   流媒体图卡 & AI 支持图卡 (Showcase Cards)
   严格遵守规范：零剪贴画，依赖严谨数据表格与结构化清单
   -------------------------------------------------------------------------- */
.capabilities-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.cap-badge-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.cap-tag {
  font-family: var(--font-mono);
  font-size: 0.725rem;
  font-weight: 600;
  color: var(--primary);
  background-color: var(--primary-subtle);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.cap-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.65rem;
}

.cap-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* 极简服务对照数据表 */
.cap-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.cap-table td {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-muted);
}

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

.cap-table td.col-service {
  font-weight: 600;
  color: var(--text-main);
}

.cap-table td.col-status {
  text-align: right;
  font-family: var(--font-mono);
  color: var(--status-good);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   套餐价格对比表 (Spring-Physics Pricing Toggle & Odometer)
   -------------------------------------------------------------------------- */
.pricing-toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 2.75rem;
}

.toggle-container {
  display: inline-flex;
  align-items: center;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  user-select: none;
}

.toggle-option {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.toggle-option.active {
  background-color: var(--bg-card);
  color: var(--text-main);
  box-shadow: var(--shadow-flat);
}

.discount-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--primary);
  margin-left: 0.35rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  align-items: stretch;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary), var(--shadow-flat);
}

.featured-pill {
  position: absolute;
  top: -12px;
  right: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  background-color: var(--primary);
  color: #ffffff;
  padding: 0.15rem 0.65rem;
  border-radius: var(--radius-sm);
}

.plan-type {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.plan-sub {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
}

/* 里程表式平滑数字切换 (Odometer transition) */
.price-box {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.price-currency {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.price-odometer {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-main);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.2s ease;
  display: inline-block;
}

.price-period {
  font-size: 0.875rem;
  color: var(--text-dim);
}

.plan-spec-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.plan-spec-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.plan-spec-item span.spec-val {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-main);
}

.btn-plan-cta {
  width: 100%;
  padding: 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: center;
  border: 1px solid var(--border-dark);
  background-color: var(--bg-card);
  color: var(--text-main);
  transition: all var(--transition-normal);
  display: block;
}

.btn-plan-cta:hover {
  background-color: var(--bg-hover);
  border-color: var(--text-main);
}

.btn-plan-cta.btn-plan-primary {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #ffffff !important;
}

.btn-plan-cta.btn-plan-primary:hover {
  background-color: var(--primary-hover);
}

/* --------------------------------------------------------------------------
   用户真实评价 (User Reviews)
   -------------------------------------------------------------------------- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.review-quote {
  font-size: 0.925rem;
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.review-author-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
}

.review-avatar-text {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.review-author-name {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--text-main);
}

.review-author-title {
  font-size: 0.775rem;
  color: var(--text-dim);
}

/* --------------------------------------------------------------------------
   常见问题解答 (FAQ)
   -------------------------------------------------------------------------- */
.faq-wrap {
  max-width: 820px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-row {
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background-color: var(--bg-card);
  overflow: hidden;
  transition: border-color var(--transition-normal);
}

.faq-row:hover {
  border-color: var(--border-dark);
}

.faq-summary {
  padding: 1.2rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--text-dim);
  transition: transform var(--transition-normal);
}

details[open] .faq-chevron {
  transform: rotate(45deg);
  color: var(--primary);
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.925rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   页脚 (Footer)
   严格遵守指令：页脚只保留这四个标题，内容打开新的页面展示
   1. 网站地图 (sitemap.html)
   2. 关于我们 (about.html)
   3. 服务条款 (terms.html)
   4. 隐私政策 (privacy.html)
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--bg-page);
  border-top: 1px solid var(--border-light);
  padding: 3rem 0;
  margin-top: auto;
}

.footer-nav-only {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  margin-bottom: 1.75rem;
}

.footer-link-item {
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition-normal);
}

.footer-link-item:hover {
  color: var(--primary);
}

.footer-meta-line {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-dim);
}

.footer-meta-line a {
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   文章 / 资讯子页面架构 (Subpage & Insights)
   -------------------------------------------------------------------------- */
.subpage-container {
  max-width: 860px;
  margin: 3rem auto 5rem;
  padding: 0 1.5rem;
}

/* 面包屑导航 (Breadcrumb) */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
}

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

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

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

/* 文章头部 */
.article-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.article-kicker-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.article-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  background-color: var(--primary-subtle);
  border: 1px solid var(--border-light);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.article-headline {
  font-size: 2.15rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 1rem;
}

.article-meta-row {
  display: flex;
  gap: 1.5rem;
  font-size: 0.825rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  flex-wrap: wrap;
}

/* 结构化文章目录 (Table of Contents) */
.article-toc {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0 2.5rem;
}

.toc-header {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toc-item a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition-normal);
  display: inline-block;
  padding-left: 0.5rem;
  border-left: 2px solid transparent;
}

.toc-item a:hover {
  color: var(--primary);
  border-left-color: var(--primary);
}

.toc-subitem {
  padding-left: 1.25rem;
  font-size: 0.825rem;
}

/* 文章正文段落 */
.article-body-text {
  font-size: 1.025rem;
  line-height: 1.85;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.article-h2 {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin: 2.75rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
  scroll-margin-top: 5rem;
}

.article-h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 1.75rem 0 0.75rem;
  scroll-margin-top: 5rem;
}

.article-list-clean {
  list-style: none;
  margin-bottom: 1.75rem;
}

.article-list-clean li {
  position: relative;
  padding-left: 1.35rem;
  margin-bottom: 0.75rem;
  line-height: 1.75;
  color: var(--text-muted);
  font-size: 0.975rem;
}

.article-list-clean li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-family: var(--font-mono);
  font-weight: bold;
}

.article-callout-clean {
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-sm);
  margin: 2rem 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-main);
}

/* 文章中的专业对比表格 */
.article-data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 2rem;
  font-size: 0.875rem;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.article-data-table th {
  background-color: var(--bg-subtle);
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 700;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-main);
}

.article-data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-muted);
}

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

/* 文章底部相关阅读 (Related Articles) */
.related-posts-section {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-light);
}

.related-posts-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1.5rem;
}

.related-posts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.related-post-card {
  display: block;
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.related-post-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-dark);
  box-shadow: var(--shadow-elevated);
}

.related-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--primary);
  margin-bottom: 0.35rem;
}

.related-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.related-excerpt {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.5;
}

/* 资讯中心专栏列表页 (Insights Portal) */
.insights-hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--border-light);
  background-color: var(--bg-subtle);
}

.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
  margin: 3rem 0 5rem;
}

.insight-card-item {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.insight-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.insight-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 0.65rem;
}

.insight-card-title a {
  color: inherit;
  transition: color var(--transition-normal);
}

.insight-card-title a:hover {
  color: var(--primary);
}

.insight-card-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.insight-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
  font-size: 0.8rem;
}

.insight-read-link {
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.insight-read-link:hover {
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   响应式断点 (@media)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  .advantages-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .capabilities-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none; /* 移动端收起锚点目录，保持页眉轻快清晰 */
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .quick-start-box {
    flex-direction: column;
    gap: 0.5rem;
  }
  .quick-start-btn {
    width: 100%;
  }
  .footer-nav-only {
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
  }
}