/* ==========================================================================
   赔钱机场 (peiqianjc.shop) - Kinetic Inverted-Luxury Telecom Design System
   极致工业质感 · 零外部依赖 · 秒开加载 · 硬核专线遥测 · 触觉反馈按钮
   ========================================================================== */

:root {
  /* 白天模式变量 (默认开门状态) */
  --bg-obsidian: #f4f6fa;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #eef2f7;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --border-bevel: #d8e0eb;
  --border-subtle: #e2e8f0;
  --border-focus: #d97706;
  
  --copper-gold: #b45309;
  --copper-gold-light: #f59e0b;
  --copper-glow: rgba(217, 119, 6, 0.22);
  --electric-cyan: #0284c7;
  --cyan-glow: rgba(2, 132, 199, 0.2);
  
  --text-primary: #090d16;
  --text-secondary: #475569;
  --text-muted: #8492a6;
  
  --telecom-card-bg: #ffffff;
  --telecom-card-border: #cbd5e1;
  --hard-shadow: 4px 4px 0px #0f172a;
  --hard-shadow-active: 1px 1px 0px #0f172a;
  --copper-shadow: 4px 4px 0px #b45309;
  --copper-shadow-active: 1px 1px 0px #b45309;
  --marquee-bg: #090a0f;
  --marquee-text: #f59e0b;
}

[data-theme="dark"] {
  /* 极致反转黑曜石模式 (Pitch Obsidian Canvas #090a0f) */
  --bg-obsidian: #090a0f;
  --bg-surface: #10141f;
  --bg-surface-elevated: #161c2c;
  --bg-glass: rgba(9, 10, 15, 0.88);
  --border-bevel: rgba(255, 255, 255, 0.09);
  --border-subtle: #1c2333;
  --border-focus: #d97706;
  
  --copper-gold: #d97706;
  --copper-gold-light: #f59e0b;
  --copper-glow: rgba(245, 158, 11, 0.35);
  --electric-cyan: #00f2fe;
  --cyan-glow: rgba(0, 242, 254, 0.3);
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --telecom-card-bg: #111624;
  --telecom-card-border: rgba(255, 255, 255, 0.08);
  --hard-shadow: 4px 4px 0px #000000;
  --hard-shadow-active: 1px 1px 0px #000000;
  --copper-shadow: 4px 4px 0px #d97706;
  --copper-shadow-active: 1px 1px 0px #d97706;
  --marquee-bg: #030407;
  --marquee-text: #f59e0b;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-obsidian);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
}

/* 页面通用容器 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* 顶部无限滚动动力跑马灯 (Kinetic Infinite Marquee) */
.kinetic-marquee {
  background: var(--marquee-bg);
  color: var(--marquee-text);
  overflow: hidden;
  white-space: nowrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 8px 0;
  border-bottom: 1px solid var(--border-bevel);
  position: relative;
  z-index: 105;
}

.marquee-track {
  display: inline-flex;
  animation: marquee-infinite 28s linear infinite;
  gap: 30px;
}

@keyframes marquee-infinite {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* 顶部导航栏 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-bevel);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 850;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.brand-icon-box {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--copper-gold) 0%, #b45309 100%);
  border: 1px solid var(--copper-gold-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 15px var(--copper-glow);
}

.brand-badge {
  font-size: 0.65rem;
  font-weight: 700;
  background: rgba(217, 119, 6, 0.12);
  color: var(--copper-gold);
  border: 1px solid var(--copper-gold);
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* 导航目录 (包含首页、各板块及推荐资讯) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 20px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  padding: 6px 4px;
}

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

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

/* 昼夜模式切换按钮 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.theme-toggle-btn {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: all 0.2s ease;
  box-shadow: 2px 2px 0px var(--border-bevel);
}

.theme-toggle-btn:hover {
  border-color: var(--copper-gold);
  color: var(--copper-gold);
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--copper-gold);
}

.theme-toggle-btn:active {
  transform: translate(2px, 2px);
  box-shadow: 0px 0px 0px transparent;
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
  position: absolute;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
}

.icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.icon-moon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

[data-theme="dark"] .icon-sun {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

[data-theme="dark"] .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* 触觉按钮系统 (3px 斜切对角下压沉浸触感) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 6px;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.2s ease;
  white-space: nowrap;
  letter-spacing: 0.02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--copper-gold) 0%, #b45309 100%);
  color: #ffffff;
  border: 1px solid var(--copper-gold-light);
  box-shadow: var(--copper-shadow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--copper-gold-light) 0%, var(--copper-gold) 100%);
}

.btn-primary:active {
  transform: translate(3px, 3px);
  box-shadow: var(--copper-shadow-active);
}

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

.btn-secondary:hover {
  border-color: var(--electric-cyan);
  color: var(--electric-cyan);
}

.btn-secondary:active {
  transform: translate(3px, 3px);
  box-shadow: var(--hard-shadow-active);
}

.btn-cyan {
  background: linear-gradient(135deg, #0284c7 0%, var(--electric-cyan) 100%);
  color: #090a0f;
  font-weight: 800;
  border: 1px solid #7dd3fc;
  box-shadow: 4px 4px 0px #0284c7;
}

.btn-cyan:active {
  transform: translate(3px, 3px);
  box-shadow: 1px 1px 0px #0284c7;
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.08rem;
}

.btn-block {
  width: 100%;
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding: 75px 0 60px;
  text-align: center;
  position: relative;
}

.telecom-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  border-radius: 4px;
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--copper-gold);
  margin-bottom: 24px;
  box-shadow: 2px 2px 0px var(--border-bevel);
}

.status-dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
  animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.035em;
  margin-bottom: 22px;
  color: var(--text-primary);
}

.copper-text {
  color: var(--copper-gold);
  text-shadow: 0 0 25px var(--copper-glow);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

/* 核心板块公共结构 */
.section-padding {
  padding: 85px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 50px;
}

.telecom-badge {
  display: inline-block;
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--electric-cyan);
  background: var(--cyan-glow);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--electric-cyan);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 850;
  color: var(--text-primary);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   板块 1：节点实测遥测矩阵 (Node Performance Grid)
   ========================================================================== */
.node-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.node-box {
  background: var(--telecom-card-bg);
  border: 1px solid var(--telecom-card-border);
  border-radius: 10px;
  padding: 24px 20px;
  box-shadow: var(--hard-shadow);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.node-box:hover {
  transform: translateY(-4px);
  border-color: var(--copper-gold);
  box-shadow: 0 0 20px var(--copper-glow), 4px 4px 0px var(--copper-gold);
}

.node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.node-flag-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--text-primary);
}

.ping-badge {
  font-family: ui-monospace, monospace;
  font-size: 0.82rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.ping-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
}

.node-protocols {
  display: flex;
  gap: 6px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.proto-pill {
  font-family: ui-monospace, monospace;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 3px;
  background: var(--bg-surface-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border-bevel);
}

.node-metrics {
  border-top: 1px dashed var(--border-bevel);
  padding-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.metric-row strong {
  color: var(--text-primary);
  font-family: ui-monospace, monospace;
}

.load-bar-wrap {
  width: 100%;
  height: 6px;
  background: var(--bg-surface-elevated);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 4px;
}

.load-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #10b981, var(--copper-gold));
  border-radius: 3px;
  transition: width 0.4s ease;
}

/* ==========================================================================
   板块 2：互动补贴旋钮组件 (Interactive Subsidy Dial Widget)
   ========================================================================== */
.subsidy-dial-widget {
  background: var(--telecom-card-bg);
  border: 2px solid var(--copper-gold);
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 0 35px var(--copper-glow), var(--hard-shadow);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.dial-controls-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.dial-title-group h3 {
  font-size: 1.8rem;
  font-weight: 850;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.dial-title-group p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* 旋钮与步进选择器 */
.knob-stepper {
  display: flex;
  gap: 12px;
}

.step-btn {
  flex: 1;
  padding: 12px 10px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s ease;
  box-shadow: var(--hard-shadow);
  text-align: center;
}

.step-btn:hover {
  border-color: var(--copper-gold);
  color: var(--copper-gold);
}

.step-btn.active {
  background: var(--copper-gold);
  color: #ffffff;
  border-color: var(--copper-gold-light);
  box-shadow: 2px 2px 0px #78350f;
  transform: translate(2px, 2px);
}

/* 滑杆旋钮组合 */
.dial-range-box {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dial-range-labels {
  display: flex;
  justify-content: space-between;
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.telecom-slider {
  -webkit-appearance: none;
  width: 100%;
  height: 10px;
  border-radius: 5px;
  background: var(--bg-surface-elevated);
  outline: none;
  border: 1px solid var(--border-bevel);
}

.telecom-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--copper-gold);
  cursor: pointer;
  border: 2px solid #ffffff;
  box-shadow: 0 0 10px var(--copper-glow);
  transition: transform 0.1s ease;
}

.telecom-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* 旋钮动态展示盘 (Speedometer & Price Drop Visual) */
.dial-gauge-display {
  background: var(--bg-obsidian);
  border: 1px solid var(--border-bevel);
  border-radius: 14px;
  padding: 30px;
  text-align: center;
  position: relative;
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.2);
}

.speedometer-visual {
  position: relative;
  width: 220px;
  height: 120px;
  margin: 0 auto 20px;
  overflow: hidden;
}

.gauge-arc {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 16px solid var(--bg-surface-elevated);
  border-top-color: var(--electric-cyan);
  border-right-color: var(--copper-gold);
  transform: rotate(-45deg);
  position: absolute;
  top: 0;
  left: 0;
  box-sizing: border-box;
}

.gauge-needle {
  width: 4px;
  height: 80px;
  background: #ef4444;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform-origin: bottom center;
  transform: translateX(-50%) rotate(-60deg);
  border-radius: 2px;
  box-shadow: 0 0 8px #ef4444;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.gauge-pivot {
  width: 18px;
  height: 18px;
  background: var(--text-primary);
  border-radius: 50%;
  position: absolute;
  bottom: -9px;
  left: 50%;
  transform: translateX(-50%);
  border: 3px solid var(--bg-surface);
}

.gauge-readout-bandwidth {
  font-family: ui-monospace, monospace;
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--electric-cyan);
  letter-spacing: -0.02em;
}

.gauge-readout-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.live-price-burn {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-bevel);
  border-radius: 8px;
  padding: 12px;
}

.price-original {
  font-size: 1rem;
  color: var(--text-muted);
  text-decoration: line-through;
}

.price-discounted {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--copper-gold);
  line-height: 1;
}

.price-subsidy-tag {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

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

.feature-card {
  background: var(--telecom-card-bg);
  border: 1px solid var(--telecom-card-border);
  border-radius: 12px;
  padding: 34px 28px;
  box-shadow: var(--hard-shadow);
  transition: all 0.2s ease;
  position: relative;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--copper-gold);
  box-shadow: var(--copper-shadow);
}

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 8px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  color: var(--copper-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-icon-box svg {
  width: 26px;
  height: 26px;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ==========================================================================
   板块 4：解锁服务 (流媒体图卡 & AI 支持图卡)
   ========================================================================== */
.services-dual-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--telecom-card-bg);
  border: 1px solid var(--telecom-card-border);
  border-radius: 14px;
  padding: 36px 32px;
  box-shadow: var(--hard-shadow);
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}

.service-card:hover {
  transform: translateY(-3px);
  border-color: var(--electric-cyan);
  box-shadow: 4px 4px 0px var(--electric-cyan);
}

.service-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.service-badge-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  color: var(--copper-gold);
  display: flex;
  align-items: center;
  justify-content: center;
}

.service-card h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.service-card-desc {
  color: var(--text-secondary);
  font-size: 0.96rem;
  margin-bottom: 24px;
  line-height: 1.65;
}

.chips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 26px;
}

.brand-chip {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: all 0.15s ease;
}

.brand-chip:hover {
  border-color: var(--copper-gold);
  color: var(--copper-gold);
}

.brand-chip svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.service-checklist {
  list-style: none;
  margin-top: auto;
  border-top: 1px dashed var(--border-bevel);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-checklist li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.service-checklist svg {
  width: 16px;
  height: 16px;
  color: #10b981;
  flex-shrink: 0;
}

/* ==========================================================================
   板块 5：真实套餐价格对比表 (Plan Matrix)
   ========================================================================== */
.pricing-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.plan-card {
  background: var(--telecom-card-bg);
  border: 1px solid var(--telecom-card-border);
  border-radius: 14px;
  padding: 38px 30px;
  box-shadow: var(--hard-shadow);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.2s ease;
}

.plan-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--copper-shadow);
}

.plan-card.featured {
  border: 2px solid var(--copper-gold);
  box-shadow: 0 0 25px var(--copper-glow), var(--copper-shadow);
}

.featured-ribbon {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--copper-gold);
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: 4px;
  letter-spacing: 0.05em;
  white-space: nowrap;
  box-shadow: 2px 2px 0px #78350f;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 850;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.plan-price-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
}

.plan-price-currency {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--copper-gold);
}

.plan-price-num {
  font-size: 3.2rem;
  font-weight: 950;
  line-height: 1;
  color: var(--text-primary);
  letter-spacing: -0.04em;
}

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

.plan-feature-items {
  list-style: none;
  margin-bottom: 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex-grow: 1;
}

.plan-feature-items li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.plan-feature-items svg {
  width: 18px;
  height: 18px;
  color: #10b981;
  margin-top: 2px;
  flex-shrink: 0;
}

.plan-feature-items strong {
  color: var(--text-primary);
}

/* ==========================================================================
   板块 6：用户评价 (Reviews)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-box {
  background: var(--telecom-card-bg);
  border: 1px solid var(--telecom-card-border);
  border-radius: 12px;
  padding: 28px;
  box-shadow: var(--hard-shadow);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.2s ease;
}

.review-box:hover {
  transform: translateY(-3px);
  border-color: var(--copper-gold);
}

.review-stars {
  display: flex;
  gap: 4px;
  color: #f59e0b;
  margin-bottom: 14px;
}

.review-stars svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.review-box p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 20px;
}

.reviewer-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.reviewer-avatar-box {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  color: var(--copper-gold);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.reviewer-meta h4 {
  font-size: 0.95rem;
  color: var(--text-primary);
}

.reviewer-meta span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   板块 7：常见问题解答 (FAQ)
   ========================================================================== */
.faq-wrap {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-card {
  background: var(--telecom-card-bg);
  border: 1px solid var(--telecom-card-border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--hard-shadow);
  transition: border-color 0.2s ease;
}

.faq-card:hover {
  border-color: var(--copper-gold);
}

.faq-trigger {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-trigger:hover {
  color: var(--copper-gold);
}

.faq-trigger svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  color: var(--text-muted);
}

.faq-card.active .faq-trigger svg {
  transform: rotate(180deg);
  color: var(--copper-gold);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.7;
}

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

/* 底部极速行动横幅 */
.cta-banner {
  background: linear-gradient(135deg, #10141f 0%, #161c2c 100%);
  border: 2px solid var(--copper-gold);
  border-radius: 16px;
  padding: 56px 40px;
  text-align: center;
  box-shadow: 0 0 30px var(--copper-glow), var(--hard-shadow);
  margin-top: 50px;
  color: #ffffff;
}

.cta-banner h2 {
  font-size: 2.4rem;
  font-weight: 900;
  margin-bottom: 14px;
}

.cta-banner p {
  color: #94a3b8;
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto 30px;
}

/* 页脚：严格只保留 4 个标题，并在新页面打开展示 */
.site-footer {
  border-top: 1px solid var(--border-bevel);
  background: var(--bg-surface);
  padding: 50px 0 35px;
  margin-top: 80px;
}

.footer-nav-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.footer-nav-link {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 6px;
  transition: all 0.15s ease;
}

.footer-nav-link:hover {
  color: var(--copper-gold);
  background: var(--bg-surface-elevated);
}

.footer-copyright {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-bevel);
  padding-top: 25px;
  max-width: 600px;
  margin: 0 auto;
}

/* 子页面样式 (关于我们 / 服务条款 / 隐私政策 / 网站地图 / 推荐资讯) */
.subpage-hero {
  padding: 60px 0 40px;
  text-align: center;
  border-bottom: 1px solid var(--border-bevel);
  background: var(--bg-surface);
  margin-bottom: 50px;
}

.subpage-content {
  max-width: 880px;
  margin: 0 auto 80px;
  background: var(--telecom-card-bg);
  border: 1px solid var(--telecom-card-border);
  border-radius: 14px;
  padding: 45px 50px;
  box-shadow: var(--hard-shadow);
}

.subpage-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 36px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-bevel);
}

.subpage-content h2:first-of-type {
  margin-top: 0;
}

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

.subpage-content ul {
  list-style: disc;
  margin-left: 24px;
  margin-bottom: 20px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.subpage-back-nav {
  margin-bottom: 24px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--copper-gold);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
}

.subpage-back-nav:hover {
  text-decoration: underline;
}

.article-card {
  margin-bottom: 30px;
  padding-bottom: 30px;
  border-bottom: 1px dashed var(--border-bevel);
}

.article-card:last-of-type {
  border-bottom: none;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-top: 20px;
}

.sitemap-card {
  border: 1px solid var(--border-bevel);
  border-radius: 10px;
  padding: 24px;
  background: var(--bg-surface-elevated);
}

.sitemap-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.sitemap-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sitemap-list a {
  color: var(--copper-gold);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-list a:hover {
  text-decoration: underline;
}

/* 响应式媒体查询适配 (Mobile Friendly) */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .node-grid,
  .features-grid,
  .pricing-matrix,
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .subsidy-dial-widget {
    grid-template-columns: 1fr;
    padding: 30px;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .nav-menu {
    display: none; /* 移动端精简突出操作 */
  }
  .node-grid,
  .features-grid,
  .services-dual-grid,
  .pricing-matrix,
  .reviews-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  .chips-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  .hero-cta-group .btn {
    width: 100%;
  }
  .footer-nav-container {
    flex-direction: column;
    gap: 12px;
  }
  .subpage-content {
    padding: 30px 20px;
  }
  .cta-banner {
    padding: 40px 20px;
  }
  .cta-banner h2 {
    font-size: 1.8rem;
  }
}

/* ==========================================================================
   深度科普 SEO 文章专属排版系统 (Articles & Hub Styles)
   ========================================================================== */
.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.breadcrumb-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s ease;
}

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

.breadcrumb-separator {
  color: var(--border-bevel);
}

.article-header {
  margin-bottom: 36px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-bevel);
}

.article-main-title {
  font-size: 2.4rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.02em;
}

.article-meta-row {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

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

/* 目录容器 (Table of Contents) */
.toc-container {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  border-left: 4px solid var(--copper-gold);
  border-radius: 8px;
  padding: 24px 28px;
  margin: 30px 0 45px;
  box-shadow: 2px 2px 0px var(--border-bevel);
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toc-list {
  list-style: none;
  padding-left: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toc-list a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.15s ease, transform 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.toc-list a:hover {
  color: var(--copper-gold);
  transform: translateX(4px);
}

.toc-num {
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  color: var(--copper-gold);
  font-weight: 700;
}

/* 文章正文 (Article Body) */
.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-primary);
}

.article-body h2 {
  font-size: 1.75rem;
  font-weight: 850;
  color: var(--text-primary);
  margin-top: 48px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-bevel);
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-top: 32px;
  margin-bottom: 14px;
}

.article-body p {
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.article-body strong {
  color: var(--text-primary);
}

.article-body ul, .article-body ol {
  margin-left: 24px;
  margin-bottom: 24px;
  color: var(--text-secondary);
}

.article-body li {
  margin-bottom: 10px;
}

/* 警示与重点强调框 */
.callout-box {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 28px 0;
  position: relative;
}

.callout-box.info {
  border-left: 4px solid var(--electric-cyan);
}

.callout-box.highlight {
  border-left: 4px solid var(--copper-gold);
}

.callout-title {
  font-weight: 800;
  font-size: 1rem;
  margin-bottom: 6px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.callout-box p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* 对比表格 */
.table-responsive-wrapper {
  overflow-x: auto;
  margin: 30px 0;
  border: 1px solid var(--border-bevel);
  border-radius: 8px;
  box-shadow: 2px 2px 0px var(--border-bevel);
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
  background: var(--bg-surface);
}

.article-table th {
  background: var(--bg-surface-elevated);
  color: var(--text-primary);
  font-weight: 800;
  padding: 14px 18px;
  border-bottom: 2px solid var(--border-bevel);
  white-space: nowrap;
}

.article-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-bevel);
  color: var(--text-secondary);
}

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

.article-table tr:hover td {
  background: var(--bg-surface-elevated);
}

/* 相关阅读区域 (Related Articles) */
.related-articles-section {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 2px solid var(--border-bevel);
}

.related-section-title {
  font-size: 1.45rem;
  font-weight: 850;
  color: var(--text-primary);
  margin-bottom: 24px;
}

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

.related-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-bevel);
  border-radius: 10px;
  padding: 22px;
  text-decoration: none;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  box-shadow: var(--hard-shadow);
}

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

.related-card-tag {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--copper-gold);
  text-transform: uppercase;
  margin-bottom: 8px;
  font-family: ui-monospace, monospace;
}

.related-card-title {
  font-size: 1.05rem;
  font-weight: 750;
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: 8px;
}

.related-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 资讯中心首页卡片网格 (Hub Listing) */
.insights-hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 20px;
}

.hub-article-card {
  background: var(--telecom-card-bg);
  border: 1px solid var(--telecom-card-border);
  border-radius: 12px;
  padding: 30px;
  box-shadow: var(--hard-shadow);
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
  text-decoration: none;
}

.hub-article-card:hover {
  transform: translateY(-4px);
  border-color: var(--copper-gold);
  box-shadow: var(--copper-shadow);
}

.hub-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.hub-card-title {
  font-size: 1.35rem;
  font-weight: 850;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.hub-card-excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 22px;
  flex-grow: 1;
}

.hub-card-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--copper-gold);
  font-weight: 750;
  font-size: 0.92rem;
}

@media (max-width: 768px) {
  .article-main-title {
    font-size: 1.8rem;
  }
  .related-grid,
  .insights-hub-grid {
    grid-template-columns: 1fr;
  }
}