/* ==========================================================================
   Nexitally (奶昔机场) - Stealth Obsidian-Monolith Luxury Design System
   UI Prompt: Void-purist palette (#000000 velvet, titanium white #ffffff,
              microscopic hairline platinum #161619). Completely devoid of AI sparks.
              Clinical monospace metrics, laser micro-interactions, monolithic negative space.
   ========================================================================== */

:root {
  /* Obsidian Monolith (夜间模式 - 纯粹虚空暗黑美学) */
  --bg-void: #000000;
  --bg-surface: #070709;
  --bg-card: #0d0d11;
  --bg-card-hover: #131317;
  --bg-glass: rgba(0, 0, 0, 0.85);
  
  --border-hairline: #161619;
  --border-subtle: #23232a;
  --border-active: #ffffff;
  --border-focus: rgba(255, 255, 255, 0.4);

  --text-pure: #ffffff;
  --text-secondary: #a1a1aa;
  --text-dim: #52525b;
  --text-inverse: #000000;

  --accent-laser: #ffffff;
  --accent-laser-glow: rgba(255, 255, 255, 0.25);
  --accent-emerald: #10b981;
  
  --shadow-dormant: 0 0 0 1px var(--border-hairline);
  --shadow-luminous: 0 0 0 1px var(--border-active), 0 20px 40px -15px rgba(255, 255, 255, 0.08);

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --header-height: 72px;
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-pill: 9999px;

  --trans-laser: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --trans-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 白天模式 (Surgical Titanium Clinical White) */
[data-theme="light"] {
  --bg-void: #fbfbfb;
  --bg-surface: #ffffff;
  --bg-card: #f6f6f8;
  --bg-card-hover: #ececed;
  --bg-glass: rgba(251, 251, 251, 0.9);

  --border-hairline: #e5e5e9;
  --border-subtle: #d4d4d8;
  --border-active: #09090b;
  --border-focus: rgba(0, 0, 0, 0.5);

  --text-pure: #09090b;
  --text-secondary: #52525b;
  --text-dim: #a1a1aa;
  --text-inverse: #ffffff;

  --accent-laser: #09090b;
  --accent-laser-glow: rgba(0, 0, 0, 0.15);
  --accent-emerald: #059669;

  --shadow-dormant: 0 0 0 1px var(--border-hairline);
  --shadow-luminous: 0 0 0 1px var(--border-active), 0 16px 36px -12px rgba(0, 0, 0, 0.12);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-void);
  color: var(--text-pure);
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-void);
  color: var(--text-pure);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--trans-smooth), color var(--trans-smooth);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all var(--trans-laser);
}

ul, ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

/* 容器与网格 */
.container {
  width: 100%;
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 120px 0;
  position: relative;
}

.section-title-wrap {
  margin-bottom: 64px;
}

.section-title-wrap.center {
  text-align: center;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  margin-bottom: 20px;
  background: var(--bg-card);
}

.section-tag::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent-laser);
}

.section-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  color: var(--text-pure);
  margin-bottom: 18px;
}

.section-desc {
  font-size: 1.08rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 680px;
}

.section-title-wrap.center .section-desc {
  margin: 0 auto;
}

/* 按钮设计体系 (Surgical Monochrome CTA) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--trans-laser);
  white-space: nowrap;
  user-select: none;
  min-height: 48px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--text-pure);
  color: var(--text-inverse) !important;
  border: 1px solid var(--text-pure);
  box-shadow: 0 0 0 1px var(--text-pure);
}

.btn-primary:hover {
  background: rgba(255, 255, 255, 0.88);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-laser-glow);
}

[data-theme="light"] .btn-primary:hover {
  background: #27272a;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-pure);
  border: 1px solid var(--border-hairline);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-subtle);
  color: var(--text-pure);
}

.btn-sm {
  padding: 7px 18px;
  font-size: 0.84rem;
  min-height: 38px;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.02rem;
  min-height: 54px;
}

/* ==========================================================================
   激光微交互横线 (Sub-atomic Laser Line)
   ========================================================================== */
.laser-divider {
  position: relative;
  width: 100%;
  height: 1px;
  background: var(--border-hairline);
  overflow: hidden;
}

.laser-pulse {
  position: absolute;
  top: 0;
  left: -20%;
  width: 25%;
  height: 100%;
  background: linear-gradient(90deg, transparent 0%, var(--accent-laser) 50%, transparent 100%);
  animation: laser-pulse-anim 4.5s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes laser-pulse-anim {
  0% { left: -30%; opacity: 0; }
  15% { opacity: 1; }
  50% { left: 110%; opacity: 1; }
  100% { left: 110%; opacity: 0; }
}

/* ==========================================================================
   页眉与导航目录 (Sticky Monolith Header)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-hairline);
  transition: all var(--trans-smooth);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 20px;
}

.brand-monolith {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-pure);
  flex-shrink: 0;
}

.brand-glyph {
  width: 32px;
  height: 32px;
  background: var(--text-pure);
  color: var(--text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 900;
}

.brand-sub {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-dim);
  margin-left: 6px;
  border-left: 1px solid var(--border-hairline);
  padding-left: 8px;
  font-family: var(--font-mono);
}

/* 导航目录：首页 + 板块锚点 + 推荐资讯 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-item {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 0;
  position: relative;
  letter-spacing: -0.01em;
  transition: color var(--trans-laser);
}

.nav-item:hover,
.nav-item.active {
  color: var(--text-pure);
}

.nav-item::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-pure);
  transition: width var(--trans-laser);
}

.nav-item:hover::after {
  width: 100%;
}

.nav-item-badge {
  display: inline-flex;
  align-items: center;
  padding: 1px 6px;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  color: var(--text-pure);
  margin-left: 6px;
  vertical-align: middle;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

/* 精致专业化透明昼夜模式切换按钮 */
.theme-switch-monolith {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--trans-laser);
  position: relative;
}

.theme-switch-monolith:hover {
  border-color: var(--border-active);
  color: var(--text-pure);
  box-shadow: 0 0 12px var(--accent-laser-glow);
}

.icon-sun, .icon-moon {
  width: 17px;
  height: 17px;
  position: absolute;
  transition: transform var(--trans-laser), opacity var(--trans-laser);
}

/* 深色模式默认显示太阳供切至白天，浅色模式显示月亮 */
[data-theme="dark"] .icon-sun { opacity: 1; transform: scale(1); }
[data-theme="dark"] .icon-moon { opacity: 0; transform: scale(0.6) rotate(-90deg); }
[data-theme="light"] .icon-sun { opacity: 0; transform: scale(0.6) rotate(90deg); }
[data-theme="light"] .icon-moon { opacity: 1; transform: scale(1); }

/* ==========================================================================
   主视觉区 (Hero Monolith)
   ========================================================================== */
.hero-monolith {
  padding: 140px 0 100px 0;
  position: relative;
}

.hero-telemetry-pill {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.telemetry-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.hero-brand-headline {
  font-size: 4.2rem;
  font-weight: 900;
  letter-spacing: -0.05em;
  line-height: 1.08;
  color: var(--text-pure);
  margin-bottom: 24px;
  max-width: 1040px;
}

.hero-sub-statement {
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.4;
  max-width: 860px;
}

.hero-summary-prose {
  font-size: 1.08rem;
  color: var(--text-dim);
  line-height: 1.85;
  max-width: 820px;
  margin-bottom: 48px;
}

.hero-actions-cluster {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 72px;
  flex-wrap: wrap;
}

/* 临床式测速指标遥测矩阵 (Clinical Monospace Transit Latency Metrics) */
.transit-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-hairline);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  overflow: hidden;
}

.telemetry-node-card {
  background: var(--bg-card);
  padding: 22px 24px;
  transition: all var(--trans-laser);
}

.telemetry-node-card:hover {
  background: var(--bg-card-hover);
}

.node-route-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.node-code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.node-status-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-emerald);
}

.node-metric-val {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-pure);
  line-height: 1.1;
  margin-bottom: 6px;
}

.node-metric-sub {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
  display: flex;
  gap: 10px;
}

/* ==========================================================================
   产品核心优势 (3个休眠态-发光对撞图文卡片)
   Server specification panels remain dormant at 20% opacity,
   snapping to 100% luminous contrast upon direct cursor proximity.
   ========================================================================== */
.monolith-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.monolith-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 44px 36px;
  position: relative;
  opacity: 0.65; /* 休眠态 */
  transition: opacity var(--trans-laser), transform var(--trans-laser), border-color var(--trans-laser), box-shadow var(--trans-laser);
  display: flex;
  flex-direction: column;
}

.monolith-card:hover {
  opacity: 1; /* 靠近瞬间激发 100% 发光高对比度 */
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-luminous);
  transform: translateY(-2px);
}

.card-spec-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-pure);
  margin-bottom: 14px;
}

.card-prose {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
  flex-grow: 1;
}

.card-specs-list {
  border-top: 1px solid var(--border-hairline);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.spec-line {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.spec-line::before {
  content: "—";
  color: var(--text-dim);
}

/* ==========================================================================
   流媒体 & AI 专项图卡 (Dual Monolith Showcase)
   ========================================================================== */
.dual-monolith-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.showcase-monolith-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 48px;
  opacity: 0.75;
  transition: all var(--trans-laser);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.showcase-monolith-card:hover {
  opacity: 1;
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-luminous);
}

.showcase-header-spec {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 18px;
}

.showcase-title {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-pure);
  margin-bottom: 14px;
}

.showcase-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
}

/* 矩阵徽章墙 (Minimalist Monospace Tags) */
.mono-tags-cluster {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-bottom: 32px;
}

.mono-tag {
  background: var(--bg-void);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-align: center;
  transition: all var(--trans-laser);
}

.showcase-monolith-card:hover .mono-tag {
  border-color: var(--border-subtle);
  color: var(--text-pure);
}

.telemetry-meta-box {
  border-top: 1px solid var(--border-hairline);
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.telemetry-meta-row {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  display: flex;
  justify-content: space-between;
}

.telemetry-meta-row span:last-child {
  color: var(--text-secondary);
}

/* ==========================================================================
   套餐价格对比表 (参考 Nexitally 官方真实资费)
   Smart Access Air (¥71/月) / Smart Access (¥117.46/月) / Premium Access (¥162/月)
   ========================================================================== */
.pricing-monolith-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-monolith-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 48px 36px;
  display: flex;
  flex-direction: column;
  opacity: 0.7;
  transition: all var(--trans-laser);
  position: relative;
}

.pricing-monolith-card:hover {
  opacity: 1;
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-luminous);
  transform: translateY(-3px);
}

/* 核心推荐款式 (Featured Titanium Highlight) */
.pricing-monolith-card.flagship {
  opacity: 1;
  border: 1px solid var(--text-pure);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-luminous);
}

.flagship-badge {
  position: absolute;
  top: -12px;
  left: 36px;
  background: var(--text-pure);
  color: var(--text-inverse);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 10px;
  border-radius: var(--radius-xs);
}

.plan-tier-header {
  margin-bottom: 24px;
}

.plan-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.plan-name {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-pure);
  margin-bottom: 8px;
}

.plan-intro {
  font-size: 0.88rem;
  color: var(--text-secondary);
  min-height: 42px;
  line-height: 1.5;
}

.plan-price-block {
  margin: 28px 0;
  border-top: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
  padding: 24px 0;
}

.price-currency-val {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.currency-symbol {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-pure);
}

.price-integer {
  font-family: var(--font-mono);
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.05em;
  color: var(--text-pure);
}

.billing-cycle {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-left: 6px;
}

.price-alternate-terms {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-dim);
}

.plan-specs-matrix {
  margin-bottom: 36px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.spec-matrix-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.spec-matrix-row strong {
  color: var(--text-pure);
}

.spec-check-mark {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-pure);
  flex-shrink: 0;
}

/* ==========================================================================
   用户口碑评价 (Monastic Review Cards)
   ========================================================================== */
.reviews-monolith-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-monolith-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  opacity: 0.7;
  transition: all var(--trans-laser);
}

.review-monolith-card:hover {
  opacity: 1;
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-luminous);
}

.review-metric-pill {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 18px;
  display: flex;
  justify-content: space-between;
}

.review-body-text {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 28px;
  flex-grow: 1;
}

.review-identity {
  border-top: 1px solid var(--border-hairline);
  padding-top: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.review-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-pure);
}

.review-role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* ==========================================================================
   常见问题解答 (FAQ) - 极简手风琴
   ========================================================================== */
.faq-monolith-list {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-monolith-item {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  overflow: hidden;
  transition: all var(--trans-laser);
}

.faq-monolith-item:hover,
.faq-monolith-item[open] {
  border-color: var(--border-active);
}

.faq-monolith-summary {
  padding: 24px 28px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-pure);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-toggle-icon {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--text-dim);
  transition: transform var(--trans-laser), color var(--trans-laser);
}

.faq-monolith-item[open] .faq-toggle-icon {
  transform: rotate(45deg);
  color: var(--text-pure);
}

.faq-monolith-content {
  padding: 0 28px 24px 28px;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-hairline);
  padding-top: 18px;
}

/* ==========================================================================
   底栏 (Footer - 严格只保留四个规定标题)
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-hairline);
  padding: 64px 0 48px 0;
  transition: all var(--trans-smooth);
}

.footer-monolith-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 36px;
  text-align: center;
}

.footer-monolith-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 44px;
  flex-wrap: wrap;
}

.footer-monolith-link {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  transition: color var(--trans-laser);
}

.footer-monolith-link:hover {
  color: var(--text-pure);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-meta-terminal {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

/* ==========================================================================
   推荐资讯 (News / Insights Page) 专用排版样式
   ========================================================================== */
.insights-feed-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
}

.article-main-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 44px;
  margin-bottom: 28px;
  transition: all var(--trans-laser);
}

.article-main-card:hover {
  border-color: var(--border-active);
  background: var(--bg-card-hover);
}

.article-meta-line {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 14px;
  display: flex;
  gap: 16px;
}

.article-headline {
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-pure);
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-snippet {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

.insights-sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 28px;
}

.sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 10px;
}

.node-health-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-hairline);
  color: var(--text-secondary);
}

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

/* ==========================================================================
   深度科普文章排版系统 (Long-form SEO Articles Typography & Layout)
   ========================================================================== */
.article-wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 40px 0 100px 0;
}

.article-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 32px;
}

.article-title-h1 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.25;
  color: var(--text-pure);
  margin: 18px 0;
}

.article-meta-badge-row {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.article-meta-badge-row span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* 目录 (Table of Contents) */
.article-toc {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 28px 32px;
  margin: 32px 0 48px 0;
}

.article-toc-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-pure);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-toc-title::before {
  content: "§";
  color: var(--text-dim);
}

.article-toc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 0;
}

.article-toc-link {
  font-size: 0.94rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  transition: color var(--trans-laser);
}

.article-toc-link:hover {
  color: var(--text-pure);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-toc-link span.num {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-dim);
}

/* 正文深度排版 */
.article-content {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.85;
}

.article-content h2 {
  font-size: 1.85rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-pure);
  margin: 48px 0 20px 0;
  padding-top: 24px;
  border-top: 1px solid var(--border-hairline);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.article-content h2 .h2-index {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-dim);
  font-weight: 500;
}

.article-content h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-pure);
  margin: 32px 0 14px 0;
  letter-spacing: -0.02em;
}

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

.article-content strong {
  color: var(--text-pure);
  font-weight: 700;
}

.article-content ul, .article-content ol {
  margin: 18px 0 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.article-content ul li {
  list-style-type: square;
}

.article-content ol li {
  list-style-type: decimal;
}

.article-content li {
  line-height: 1.75;
}

.article-content a {
  color: var(--text-pure);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-content a:hover {
  opacity: 0.8;
}

/* 警示与高亮面板 (Callout Box) */
.callout-panel {
  background: var(--bg-card);
  border-left: 3px solid var(--text-pure);
  border-top: 1px solid var(--border-hairline);
  border-right: 1px solid var(--border-hairline);
  border-bottom: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 24px;
  margin: 32px 0;
  font-size: 0.98rem;
  line-height: 1.75;
}

.callout-panel-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-pure);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

/* 代码与配置块 */
.code-monolith {
  background: var(--bg-void);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 20px 24px;
  margin: 24px 0;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-pure);
}

/* 对比表格 */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  margin: 28px 0;
}

.data-comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

.data-comparison-table th,
.data-comparison-table td {
  padding: 14px 18px;
  border: 1px solid var(--border-hairline);
}

.data-comparison-table th {
  background: var(--bg-card);
  color: var(--text-pure);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.data-comparison-table td {
  background: var(--bg-surface);
  color: var(--text-secondary);
}

.data-comparison-table tr:hover td {
  background: var(--bg-card-hover);
}

/* 文章专属 FAQ 区域 */
.article-faq-wrap {
  margin: 56px 0 48px 0;
  border-top: 1px solid var(--border-hairline);
  padding-top: 36px;
}

.article-section-heading {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-pure);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

/* 文章底部 CTA 转化面板 */
.article-cta-box {
  background: var(--bg-card);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-xs);
  padding: 44px;
  margin: 48px 0;
  text-align: center;
  box-shadow: var(--shadow-luminous);
}

.article-cta-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-pure);
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}

.article-cta-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 28px auto;
  line-height: 1.7;
}

/* 相关阅读区域 (Related Reading) */
.article-related-wrap {
  margin-top: 56px;
  border-top: 1px solid var(--border-hairline);
  padding-top: 36px;
}

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

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-xs);
  padding: 24px;
  transition: all var(--trans-laser);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.related-card:hover {
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.related-card-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-pure);
  line-height: 1.45;
  margin-bottom: 14px;
}

.related-card-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.related-card:hover .related-card-link {
  color: var(--text-pure);
}

/* ==========================================================================
   响应式断点优化 (@media)
   手机端完美单栏展示，极简触控适配
   ========================================================================== */
@media (max-width: 1080px) {
  .hero-brand-headline {
    font-size: 3.2rem;
  }
  .transit-telemetry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .monolith-cards-grid,
  .pricing-monolith-grid,
  .reviews-monolith-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .insights-feed-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }

  .section {
    padding: 72px 0;
  }

  .container {
    padding: 0 20px;
  }

  .nav-menu {
    display: none; /* 移动端精简目录，优先展示核心注册按钮与昼夜切换 */
  }

  .hero-monolith {
    padding: 80px 0 60px 0;
  }

  .hero-brand-headline {
    font-size: 2.25rem;
    line-height: 1.15;
  }

  .hero-sub-statement {
    font-size: 1.15rem;
  }

  .hero-summary-prose {
    font-size: 0.98rem;
  }

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

  .hero-actions-cluster .btn {
    width: 100%;
    min-height: 50px;
  }

  .transit-telemetry-grid,
  .monolith-cards-grid,
  .dual-monolith-grid,
  .pricing-monolith-grid,
  .reviews-monolith-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .monolith-card,
  .showcase-monolith-card,
  .pricing-monolith-card {
    padding: 28px 22px;
    opacity: 1; /* 移动端直接保持全对比度清晰可见 */
  }

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

  .footer-monolith-nav {
    flex-direction: column;
    gap: 18px;
  }
}