/* ==========================================================================
   MESL 机场 (meslcloud.sbs) - 量子实验室超导磁通风格核心样式表
   UI Concept: Superconductor Magnetic Flux Transit
   Aesthetic: Quantum lab minimalism, Deep vacuum navy (#040711), 
              Superconductor cobalt blue (#1D4ED8), Ionized silver (#E2E8F0)
   Features: Zero icon reliance, Energy ripples & loops, Smooth anchor motion,
             Full responsive mobile single-column adaptivity
   ========================================================================== */

:root {
  /* 基础字体与动画参数 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --border-radius-full: 9999px;
  --max-width: 1240px;
  --header-height: 72px;

  /* 白天模式（量子实验室微光白 - 默认） */
  --bg-vacuum: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.88);
  --bg-card-hover: #ffffff;
  --border-subtle: rgba(226, 232, 240, 0.85);
  --border-glow: rgba(29, 78, 216, 0.35);

  --text-main: #040711;
  --text-muted: #334155;
  --text-dim: #64748b;
  --text-inverse: #ffffff;

  --superconductor-blue: #1d4ed8;
  --superconductor-cyan: #0284c7;
  --flux-glow: rgba(29, 78, 216, 0.15);
  --ionized-silver: #e2e8f0;
  --quantum-emerald: #059669;
  --quantum-amber: #d97706;
  --quantum-rose: #e11d48;

  --gradient-flux: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #0284c7 100%);
  --gradient-ring: radial-gradient(circle, rgba(29, 78, 216, 0.12) 0%, rgba(2, 132, 199, 0.05) 45%, transparent 70%);
  --nav-backdrop: rgba(248, 250, 252, 0.86);

  --shadow-subtle: 0 2px 10px rgba(0, 0, 0, 0.04);
  --shadow-elevated: 0 12px 36px rgba(4, 7, 17, 0.08);
  --shadow-magnetic: 0 16px 48px rgba(29, 78, 216, 0.16);
}

/* 黑色/夜间模式（深度真空暗夜 Deep Vacuum Navy #040711） */
[data-theme="dark"] {
  --bg-vacuum: #040711;
  --bg-surface: #0a0f1d;
  --bg-surface-elevated: #111827;
  --bg-card: rgba(10, 15, 29, 0.76);
  --bg-card-hover: rgba(17, 24, 39, 0.9);
  --border-subtle: rgba(226, 232, 240, 0.12);
  --border-glow: rgba(59, 130, 246, 0.5);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-inverse: #040711;

  --superconductor-blue: #3b82f6;
  --superconductor-cyan: #38bdf8;
  --flux-glow: rgba(59, 130, 246, 0.28);
  --ionized-silver: #e2e8f0;
  --quantum-emerald: #10b981;
  --quantum-amber: #f59e0b;
  --quantum-rose: #f43f5e;

  --gradient-flux: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 50%, #38bdf8 100%);
  --gradient-ring: radial-gradient(circle, rgba(29, 78, 216, 0.25) 0%, rgba(56, 189, 248, 0.08) 50%, transparent 75%);
  --nav-backdrop: rgba(4, 7, 17, 0.88);

  --shadow-subtle: 0 2px 12px rgba(0, 0, 0, 0.6);
  --shadow-elevated: 0 12px 40px rgba(0, 0, 0, 0.85);
  --shadow-magnetic: 0 16px 52px rgba(29, 78, 216, 0.35);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-vacuum);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  background-image: 
    radial-gradient(circle at 50% 0%, var(--flux-glow) 0%, transparent 55%),
    radial-gradient(circle at 90% 80%, rgba(2, 132, 199, 0.05) 0%, transparent 45%);
  background-attachment: fixed;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

ul, ol {
  list-style: none;
}

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

.section {
  padding: 100px 0;
  position: relative;
}

.section-alt {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

/* 锚点滚动高亮靶心动效 */
:target {
  animation: sectionPulse 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes sectionPulse {
  0% { outline: 2px solid transparent; }
  30% { outline: 2px solid var(--superconductor-blue); outline-offset: 8px; }
  100% { outline: 2px solid transparent; outline-offset: 0; }
}

/* 顶部导航栏 (Header) */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--nav-backdrop);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 1000;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 磁通能量环 Logo（Zero Icon 概念：发光微型超导环） */
.brand-flux-ring {
  width: 32px;
  height: 32px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-flux-ring::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 2px solid var(--superconductor-blue);
  box-shadow: 0 0 14px var(--superconductor-blue);
  animation: ringRotate 8s linear infinite;
}

.brand-flux-ring::after {
  content: '';
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--superconductor-cyan);
  box-shadow: 0 0 10px var(--superconductor-cyan);
}

@keyframes ringRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.brand-title {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-subtitle-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: var(--border-radius-sm);
  background: var(--border-subtle);
  color: var(--superconductor-blue);
  letter-spacing: 0.05em;
}

/* 导航链接目录 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 6px 0;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--superconductor-blue);
  box-shadow: 0 0 8px var(--superconductor-blue);
  transition: width 0.25s var(--transition-normal), left 0.25s var(--transition-normal);
  border-radius: 2px;
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
  left: 0;
}

/* 推荐资讯特殊微光指示徽章 */
.nav-link-badge {
  display: inline-flex;
  align-items: center;
  position: relative;
}

.nav-link-badge::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--quantum-emerald);
  margin-right: 6px;
  box-shadow: 0 0 6px var(--quantum-emerald);
  animation: energyBlink 2s infinite ease-in-out;
}

@keyframes energyBlink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 昼夜模式切换按钮（量子微玻透明质感，磁通环过渡） */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  box-shadow: var(--shadow-subtle);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-fast), 
              box-shadow var(--transition-fast), 
              transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--superconductor-blue);
  box-shadow: 0 0 16px var(--flux-glow);
  transform: translateY(-1px);
}

/* 昼夜模式微光图形（无需重型图标，几何光子圆环与月晕） */
.theme-flux-indicator {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--text-main);
  position: relative;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), 
              background-color 0.3s ease, 
              border-color 0.3s ease;
}

[data-theme="dark"] .theme-flux-indicator {
  background-color: var(--superconductor-blue);
  border-color: var(--superconductor-cyan);
  box-shadow: 0 0 12px var(--superconductor-blue);
  transform: scale(0.9);
}

/* 呼吁性按钮（CTA Buttons） */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.94rem;
  padding: 10px 22px;
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
  letter-spacing: -0.01em;
  position: relative;
}

.btn-primary {
  background: var(--gradient-flux);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(29, 78, 216, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(29, 78, 216, 0.55);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-subtle);
}

.btn-secondary:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--superconductor-blue);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 32px;
  font-size: 1.05rem;
  border-radius: var(--border-radius-md);
}

.btn-block {
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-subtle);
  align-items: center;
  justify-content: center;
  color: var(--text-main);
}

/* ==========================================================================
   Hero Section: Radial Focal Composition & Superconductor Torus Ring
   3D 超导磁通能量环交互画布
   ========================================================================== */

.hero-section {
  padding: 130px 0 80px;
  position: relative;
  text-align: center;
  overflow: hidden;
}

.hero-quantum-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 18px;
  border-radius: var(--border-radius-full);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 0 20px var(--flux-glow);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--superconductor-blue);
  margin-bottom: 24px;
}

.flux-ripple-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--superconductor-cyan);
  position: relative;
}

.flux-ripple-dot::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid var(--superconductor-cyan);
  animation: rippleExpand 1.8s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}

@keyframes rippleExpand {
  0% { transform: scale(0.6); opacity: 1; }
  100% { transform: scale(2.4); opacity: 0; }
}

/* 大标题包含“当前品牌名” */
.hero-title {
  font-size: 3.4rem;
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
  color: var(--text-main);
}

.hero-title-brand {
  background: var(--gradient-flux);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--superconductor-blue);
  margin-bottom: 14px;
  letter-spacing: -0.01em;
}

.hero-description {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 36px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

/* 超导磁通 3D 环交互视窗 (Torus Flux Canvas Stage) */
.torus-stage-container {
  width: 100%;
  max-width: 1060px;
  height: 480px;
  margin: 0 auto 50px;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

#superconductorCanvas {
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
}

#superconductorCanvas:active {
  cursor: grabbing;
}

/* 磁通画布交互提示 HUD */
.torus-hud-overlay {
  position: absolute;
  top: 18px;
  left: 24px;
  right: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.hud-pill {
  padding: 4px 12px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-full);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hud-live-tag {
  color: var(--quantum-emerald);
  font-weight: 700;
}

/* 悬停锁定的节点数据面板 (Node Snapping Data Pane) */
.node-telemetry-hud {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-surface);
  border: 1px solid var(--superconductor-blue);
  box-shadow: 0 0 24px var(--flux-glow);
  padding: 12px 24px;
  border-radius: var(--border-radius-md);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 20px;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  opacity: 0.95;
}

.telemetry-item strong {
  color: var(--superconductor-blue);
  font-weight: 700;
}

/* 核心状态指标卡排布 */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1060px;
  margin: 0 auto;
  padding: 24px 30px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-subtle);
}

.stat-box {
  text-align: center;
  border-right: 1px solid var(--border-subtle);
}

.stat-box:last-child {
  border-right: none;
}

.stat-value {
  font-size: 1.85rem;
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.84rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* 章节头部公共结构 */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 60px;
}

.section-quantum-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--superconductor-blue);
  margin-bottom: 12px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 14px;
  color: var(--text-main);
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* 产品核心优势 3 个图文卡片 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-quantum-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: 38px 30px;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-fast), 
              box-shadow var(--transition-fast), 
              border-color var(--transition-fast);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.feature-quantum-card:hover {
  transform: translateY(-6px);
  border-color: var(--superconductor-blue);
  box-shadow: var(--shadow-magnetic);
}

.feature-flux-visual {
  width: 52px;
  height: 52px;
  border-radius: var(--border-radius-md);
  margin-bottom: 24px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
}

.feature-flux-visual::before {
  content: '';
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--superconductor-blue);
  box-shadow: 0 0 10px var(--superconductor-blue);
}

.feature-quantum-card:nth-child(2) .feature-flux-visual::before {
  border-color: var(--superconductor-cyan);
  box-shadow: 0 0 10px var(--superconductor-cyan);
}

.feature-quantum-card:nth-child(3) .feature-flux-visual::before {
  border-color: var(--quantum-emerald);
  box-shadow: 0 0 10px var(--quantum-emerald);
}

.feature-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-text {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 22px;
}

.feature-telemetry-specs {
  border-top: 1px solid var(--border-subtle);
  padding-top: 16px;
}

.spec-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.86rem;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.spec-line strong {
  color: var(--text-main);
}

/* 流媒体图卡 & AI 支持图卡并排区 */
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.showcase-quantum-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: 42px 36px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.showcase-quantum-card:hover {
  border-color: var(--superconductor-blue);
  box-shadow: var(--shadow-magnetic);
}

.showcase-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  border-radius: var(--border-radius-full);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

.badge-stream {
  background: rgba(225, 29, 72, 0.1);
  color: var(--quantum-rose);
  border: 1px solid rgba(225, 29, 72, 0.25);
}

.badge-ai {
  background: rgba(5, 150, 105, 0.1);
  color: var(--quantum-emerald);
  border: 1px solid rgba(5, 150, 105, 0.25);
}

.showcase-title {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
}

.showcase-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.flux-pills-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0;
}

.flux-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
}

.flux-pill-core {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.showcase-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: 20px;
}

/* ==========================================================================
   套餐价格对比表（参考网上真实套餐价格）
   真实 MESL 机场资费梯度参考：
   轻量入门 (¥26/月/120G) | 畅享进阶 (¥52/月/320G) | 尊享旗舰 (¥98/月/750G)
   ========================================================================== */

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-fast), 
              box-shadow var(--transition-fast), 
              border-color var(--transition-fast);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--superconductor-blue);
  box-shadow: var(--shadow-magnetic);
}

.pricing-card.featured {
  border: 2px solid var(--superconductor-blue);
  box-shadow: 0 12px 36px var(--flux-glow);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
}

.pricing-badge-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-flux);
  color: #fff;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--border-radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(29, 78, 216, 0.4);
}

.plan-heading {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.plan-summary {
  font-size: 0.88rem;
  color: var(--text-dim);
  min-height: 44px;
}

.plan-pricing-box {
  margin: 24px 0 20px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.plan-currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--superconductor-blue);
}

.plan-amount {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--text-main);
}

.plan-period {
  font-size: 0.9rem;
  color: var(--text-dim);
  font-weight: 600;
}

.plan-specs-list {
  border-top: 1px solid var(--border-subtle);
  padding: 24px 0;
  margin-bottom: 24px;
  flex-grow: 1;
}

.plan-spec-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.plan-spec-row:last-child {
  margin-bottom: 0;
}

.plan-spec-row strong {
  color: var(--text-main);
}

/* 用户真实评价 (Reviews) */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-quantum-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: 32px 28px;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-score-stars {
  font-size: 0.9rem;
  color: var(--quantum-amber);
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.review-body {
  font-size: 0.96rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}

.review-user-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-avatar-flux {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--superconductor-blue);
  font-size: 1rem;
}

.review-user-name {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-main);
}

.review-user-role {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* 常见问题 (FAQ 手风琴) */
.faq-box {
  max-width: 820px;
  margin: 0 auto;
}

.faq-unit {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-unit:hover {
  border-color: var(--superconductor-blue);
}

.faq-header-trigger {
  width: 100%;
  text-align: left;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  background: transparent;
}

.faq-indicator-symbol {
  width: 16px;
  height: 16px;
  position: relative;
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-indicator-symbol::before, .faq-indicator-symbol::after {
  content: '';
  position: absolute;
  background-color: var(--text-dim);
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.faq-indicator-symbol::before {
  top: 7px;
  left: 0;
  right: 0;
  height: 2px;
}

.faq-indicator-symbol::after {
  top: 0;
  bottom: 0;
  left: 7px;
  width: 2px;
}

.faq-unit.active .faq-indicator-symbol {
  transform: rotate(45deg);
}

.faq-unit.active .faq-indicator-symbol::before,
.faq-unit.active .faq-indicator-symbol::after {
  background-color: var(--superconductor-blue);
}

.faq-body-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  padding: 0 26px;
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.75;
}

.faq-unit.active .faq-body-content {
  max-height: 300px;
  padding-bottom: 22px;
}

/* 规范页脚：严格仅保留 4 个标题链接 */
.footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: 50px 0 38px;
  transition: background-color var(--transition-normal);
}

.footer-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav-item a {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-muted);
  padding: 8px 14px;
  border-radius: var(--border-radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.footer-nav-item a:hover {
  color: var(--superconductor-blue);
  background: var(--bg-surface-elevated);
}

.footer-copyright {
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-dim);
}

/* 推荐资讯子页面及法律子页面文章排版 */
.page-article {
  max-width: 880px;
  margin: 110px auto 60px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-lg);
  padding: 50px 44px;
  box-shadow: var(--shadow-elevated);
}

.page-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 24px;
  margin-bottom: 34px;
}

.page-title {
  font-size: 2.3rem;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.page-meta {
  font-size: 0.88rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 36px 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 22px 0 12px;
}

.article-content p, .article-content li {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.article-content ul {
  padding-left: 24px;
  list-style: square;
  margin-bottom: 24px;
}

.article-notice-box {
  background: var(--bg-surface-elevated);
  border-left: 4px solid var(--superconductor-blue);
  padding: 18px 22px;
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  margin: 26px 0;
}

/* 推荐资讯文章卡片网格 */
.insights-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-top: 24px;
}

.insight-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-md);
  padding: 28px;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.insight-card:hover {
  transform: translateY(-4px);
  border-color: var(--superconductor-blue);
}

.insight-tag {
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--superconductor-blue);
  background: var(--bg-card);
  padding: 3px 8px;
  border-radius: var(--border-radius-sm);
  display: inline-block;
  margin-bottom: 10px;
}

.insight-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

/* ==========================================================================
   响应式媒体查询适配 (@media)
   移动端单栏流畅显示、手指友好点击尺寸（>=48px）
   ========================================================================== */

@media (max-width: 992px) {
  .hero-title {
    font-size: 2.7rem;
  }

  .torus-stage-container {
    height: 400px;
  }

  .features-grid, .showcase-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }

  .pricing-card.featured {
    transform: none;
  }

  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }

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

  .stat-box:nth-child(2) {
    border-right: none;
  }
}

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

  .section {
    padding: 70px 0;
  }

  .hero-section {
    padding: 100px 0 60px;
  }

  .hero-title {
    font-size: 2.15rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  .torus-stage-container {
    height: 320px;
  }

  .node-telemetry-hud {
    flex-direction: column;
    gap: 6px;
    padding: 8px 14px;
    font-size: 0.75rem;
    width: 90%;
  }

  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
    min-height: 50px;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    display: none;
    box-shadow: var(--shadow-elevated);
  }

  .nav-links.active {
    display: flex;
  }

  .stats-strip {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .stat-box {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 14px;
  }

  .stat-box:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .footer-nav-list {
    flex-direction: column;
    gap: 16px;
  }

  .page-article {
    padding: 30px 20px;
    margin-top: 80px;
  }

  .btn {
    min-height: 48px;
  }
}