/* ==========================================================================
   闪电机场 ShanDianJiChang - 电路矩阵 · 神经网络 · 赛博科技风格样式表
   配色体系：#020617 深空黑 | #22D3EE 电路青 | #A855F7 神经紫 | #FFFFFF
   等宽字体：JetBrains Mono (大标题与数据标签) | 正文字体：Inter / 思源黑体
   ========================================================================== */

:root {
  --bg-primary: #020617;
  --bg-secondary: #0b1120;
  --bg-card: rgba(11, 17, 32, 0.7);
  --bg-card-hover: rgba(15, 23, 42, 0.85);
  
  --primary-cyan: #22D3EE;
  --secondary-purple: #A855F7;
  --accent-blue: #38bdf8;
  
  --border-cyber: rgba(34, 211, 238, 0.18);
  --border-cyber-purple: rgba(168, 85, 247, 0.25);
  --border-hover: rgba(34, 211, 238, 0.6);
  
  --text-main: #FFFFFF;
  --text-muted: rgba(255, 255, 255, 0.65);
  --text-dim: rgba(255, 255, 255, 0.45);
  
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Courier New", monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --radius-btn: 4px; /* 要求：圆角 4px */
  --radius-card: 8px;
  --container-width: 1200px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

/* 锚点防固定页眉遮挡 */
section[id], [id] {
  scroll-margin-top: 85px;
}

/* 无障碍跳过链接 (Skip to main content) */
.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--primary-cyan);
  color: #020617;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-btn);
  z-index: 99999;
  text-decoration: none;
  transition: top 0.2s ease;
  box-shadow: 0 0 20px rgba(34, 211, 238, 0.6);
}

.skip-link:focus {
  top: 15px;
  outline: 2px solid #fff;
}

/* 键盘焦点可见性高亮 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px dashed var(--primary-cyan);
  outline-offset: 4px;
}

.nav {
  display: flex;
  align-items: center;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* ==========================================================================
   【背景动效】
   1. 细网格线（带 radial mask 让边缘渐隐）
   2. 2 个大型 blur 光晕缓慢呼吸缩放（青/紫）
   3. 全屏电路板 PCB 走线 SVG
   ========================================================================== */

/* 细网格背景 */
.cyber-grid-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(to right, rgba(34, 211, 238, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 211, 238, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 90%);
  -webkit-mask-image: radial-gradient(circle at center, black 40%, transparent 90%);
  pointer-events: none;
  z-index: -3;
}

/* 2个大型呼吸光晕 */
.cyber-glow-cyan {
  position: fixed;
  top: 10%;
  left: 15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.12) 0%, transparent 70%);
  filter: blur(80px);
  animation: breathGlow1 8s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: -2;
}

.cyber-glow-purple {
  position: fixed;
  bottom: 15%;
  right: 10%;
  width: 560px;
  height: 560px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.12) 0%, transparent 70%);
  filter: blur(90px);
  animation: breathGlow2 10s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: -2;
}

@keyframes breathGlow1 {
  0% { transform: scale(0.9) translate(0, 0); opacity: 0.7; }
  100% { transform: scale(1.15) translate(25px, 15px); opacity: 1; }
}

@keyframes breathGlow2 {
  0% { transform: scale(1.1) translate(0, 0); opacity: 0.6; }
  100% { transform: scale(0.85) translate(-25px, -20px); opacity: 0.95; }
}

/* 全屏电路板 PCB 走线 SVG 背景 */
.cyber-pcb-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.pcb-trace {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.pcb-trace-cyan {
  stroke: var(--primary-cyan);
  stroke-opacity: 0.35;
  stroke-width: 1.5;
  stroke-dasharray: 16 24;
  animation: pcbFlowCyan 6s linear infinite;
}

.pcb-trace-purple {
  stroke: var(--secondary-purple);
  stroke-opacity: 0.35;
  stroke-width: 1.5;
  stroke-dasharray: 20 28;
  animation: pcbFlowPurple 7.5s linear infinite;
}

@keyframes pcbFlowCyan {
  to { stroke-dashoffset: -400; }
}

@keyframes pcbFlowPurple {
  to { stroke-dashoffset: 400; }
}

/* PCB 节点小圆点脉冲 */
.pcb-node {
  animation: pcbNodePulse 2.5s ease-in-out infinite alternate;
  transform-origin: center;
}

.pcb-node-cyan {
  fill: var(--primary-cyan);
  filter: drop-shadow(0 0 6px var(--primary-cyan));
}

.pcb-node-purple {
  fill: var(--secondary-purple);
  filter: drop-shadow(0 0 6px var(--secondary-purple));
}

@keyframes pcbNodePulse {
  0% { r: 3px; opacity: 0.5; }
  50% { r: 4.5px; opacity: 1; }
  100% { r: 3px; opacity: 0.5; }
}

/* 通用链接与图标 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

img, svg {
  vertical-align: middle;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   【CTA 按钮】
   规范：青色描边按钮（无填充），hover 时填充青色 + 文字变黑，圆角 4px，等宽字体
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 26px;
  border-radius: var(--radius-btn); /* 严格 4px */
  cursor: pointer;
  transition: var(--transition);
  min-height: 48px;
  letter-spacing: 0.5px;
  white-space: nowrap;
  background: transparent;
  border: 1px solid var(--primary-cyan);
  color: var(--primary-cyan);
  box-shadow: 0 0 14px rgba(34, 211, 238, 0.15);
  position: relative;
  overflow: hidden;
}

.btn:hover {
  background: var(--primary-cyan);
  color: #020617; /* hover 文字变黑 */
  box-shadow: 0 0 25px rgba(34, 211, 238, 0.5);
  transform: translateY(-2px);
}

.btn-primary {
  border-color: var(--primary-cyan);
  color: var(--primary-cyan);
}

.btn-secondary {
  border-color: var(--secondary-purple);
  color: #e2e8f0;
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.12);
}

.btn-secondary:hover {
  background: var(--primary-cyan);
  border-color: var(--primary-cyan);
  color: #020617;
  box-shadow: 0 0 25px rgba(34, 211, 238, 0.5);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
  min-height: 38px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   导航栏 (Header)
   ========================================================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(2, 6, 23, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-cyber);
  padding: 14px 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid var(--primary-cyan);
  border-radius: var(--radius-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
  font-weight: 900;
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.35);
}

.logo-sub {
  font-size: 0.8rem;
  color: var(--secondary-purple);
  font-weight: 500;
  margin-left: 4px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  font-family: var(--font-mono);
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 4px 6px;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover {
  color: var(--primary-cyan);
  border-bottom-color: var(--primary-cyan);
}

/* ==========================================================================
   【主视觉区 (Hero Section)】
   左侧：H1「闪电机场」JetBrains Mono + 青色发光阴影 + 简介
   右侧动画：340×340px 神经网络核心 (双层反向虚线圆轨道 + 多边形连线 + 节点发光 + 闪电放电 + 4角数据标签)
   ========================================================================== */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
  margin-bottom: 50px;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.3);
  color: var(--primary-cyan);
  padding: 6px 14px;
  border-radius: var(--radius-btn);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 22px;
}

.badge-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-cyan);
  box-shadow: 0 0 10px var(--primary-cyan);
  animation: pcbNodePulse 1.5s infinite;
}

/* H1 大标题：JetBrains Mono 等宽字体，700字重，青色发光阴影 */
.hero-title {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
  color: #FFFFFF;
  text-shadow: 
    0 0 20px rgba(34, 211, 238, 0.55),
    0 0 40px rgba(34, 211, 238, 0.25);
}

.text-gradient {
  background: linear-gradient(135deg, #22D3EE 0%, #38bdf8 50%, #A855F7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: 1.08rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 34px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

/* 神经网络核心容器 340×340px */
.neural-core-wrapper {
  position: relative;
  width: 340px;
  height: 340px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 4个角落等宽字体数据标签 */
.neural-tag {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--primary-cyan);
  background: rgba(2, 6, 23, 0.85);
  border: 1px solid rgba(34, 211, 238, 0.3);
  padding: 2px 7px;
  border-radius: 2px;
  letter-spacing: 0.5px;
  z-index: 5;
}

.neural-tag.top-left { top: 0; left: 0; }
.neural-tag.top-right { top: 0; right: 0; color: var(--secondary-purple); border-color: rgba(168, 85, 247, 0.4); }
.neural-tag.bottom-left { bottom: 0; left: 0; }
.neural-tag.bottom-right { bottom: 0; right: 0; color: #00ff88; border-color: rgba(0, 255, 136, 0.4); }

/* 2层虚线圆轨道反向旋转 */
.orbit-track {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.orbit-outer {
  width: 300px;
  height: 300px;
  border: 1px dashed rgba(34, 211, 238, 0.45);
  animation: rotateOrbitCW 24s linear infinite;
}

.orbit-inner {
  width: 240px;
  height: 240px;
  border: 1px dashed rgba(168, 85, 247, 0.45);
  animation: rotateOrbitCCW 18s linear infinite;
}

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

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

/* 神经网络多边形连线 SVG */
.neural-mesh-svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 340px;
  height: 340px;
}

.neural-line-cyan {
  stroke: var(--primary-cyan);
  stroke-width: 1.2;
  stroke-dasharray: 8 12;
  animation: neuralFlow 5s linear infinite;
  opacity: 0.65;
}

.neural-line-purple {
  stroke: var(--secondary-purple);
  stroke-width: 1.2;
  stroke-dasharray: 10 14;
  animation: neuralFlowReverse 6s linear infinite;
  opacity: 0.65;
}

@keyframes neuralFlow {
  to { stroke-dashoffset: -200; }
}

@keyframes neuralFlowReverse {
  to { stroke-dashoffset: 200; }
}

/* 节点小圆点发光脉冲 */
.neural-node {
  animation: neuralNodePulse 2s ease-in-out infinite alternate;
}

.node-cyan {
  fill: var(--primary-cyan);
  filter: drop-shadow(0 0 5px var(--primary-cyan));
}

.node-purple {
  fill: var(--secondary-purple);
  filter: drop-shadow(0 0 5px var(--secondary-purple));
}

@keyframes neuralNodePulse {
  0% { r: 3px; opacity: 0.6; }
  50% { r: 4.8px; opacity: 1; }
  100% { r: 3px; opacity: 0.6; }
}

/* 中心闪电符号 SVG (60×100px) 渐变填充 + 白色描边 + 双层辉光 + 每2秒放电动画 */
.center-lightning-bolt {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 100px;
  z-index: 10;
  animation: dischargePulse 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
  filter: 
    drop-shadow(0 0 10px #22D3EE)
    drop-shadow(0 0 25px rgba(168, 85, 247, 0.8));
}

@keyframes dischargePulse {
  0% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.9;
    filter: drop-shadow(0 0 8px #22D3EE) drop-shadow(0 0 18px rgba(168, 85, 247, 0.7));
  }
  45% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.9;
  }
  50% {
    /* 触发放电爆炸瞬间 */
    transform: translate(-50%, -50%) scale(1.18);
    opacity: 1;
    filter: 
      drop-shadow(0 0 22px #22D3EE)
      drop-shadow(0 0 45px #A855F7)
      drop-shadow(0 0 60px #FFFFFF);
  }
  55% {
    transform: translate(-50%, -50%) scale(0.97);
    opacity: 0.85;
  }
  60% {
    transform: translate(-50%, -50%) scale(1.05);
    opacity: 1;
  }
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.9;
    filter: drop-shadow(0 0 8px #22D3EE) drop-shadow(0 0 18px rgba(168, 85, 247, 0.7));
  }
}

/* 核心指标统计 */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 32px;
  border-top: 1px solid var(--border-cyber);
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 1.85rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.stat-num span {
  color: var(--primary-cyan);
  font-size: 1.25rem;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ==========================================================================
   通用 Section 布局与科技标题
   ========================================================================== */
.section-padding {
  padding: 85px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary-cyan);
  letter-spacing: 2.5px;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 14px;
  color: #fff;
  letter-spacing: -0.5px;
}

.section-desc {
  font-size: 1.02rem;
  color: var(--text-muted);
}

/* ==========================================================================
   产品核心优势卡片 (3个图文卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-cyber);
  border-radius: var(--radius-card);
  padding: 34px 28px;
  transition: var(--transition);
  position: relative;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 0 30px rgba(34, 211, 238, 0.15);
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-btn);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--primary-cyan);
}

.feature-card:nth-child(2) .feature-icon-box {
  background: rgba(168, 85, 247, 0.08);
  border-color: rgba(168, 85, 247, 0.4);
  color: var(--secondary-purple);
}

.feature-card:nth-child(3) .feature-icon-box {
  background: rgba(34, 211, 238, 0.08);
  border-color: rgba(34, 211, 238, 0.3);
  color: var(--primary-cyan);
}

.feature-title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.94rem;
  line-height: 1.65;
  margin-bottom: 18px;
}

.feature-points {
  list-style: none;
  border-top: 1px solid rgba(34, 211, 238, 0.1);
  padding-top: 14px;
}

.feature-points li {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.feature-points li::before {
  content: "⚡";
  color: var(--primary-cyan);
  font-size: 0.8rem;
}

/* ==========================================================================
   流媒体与 AI 支持图卡
   ========================================================================== */
.support-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.support-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-cyber);
  border-radius: var(--radius-card);
  padding: 34px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.support-panel:hover {
  border-color: var(--border-hover);
  box-shadow: 0 0 25px rgba(34, 211, 238, 0.12);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.panel-title {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: var(--radius-btn);
  background: rgba(34, 211, 238, 0.1);
  color: var(--primary-cyan);
  border: 1px solid rgba(34, 211, 238, 0.35);
  font-weight: 600;
}

.panel-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 22px;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.app-item {
  background: rgba(2, 6, 23, 0.6);
  border: 1px solid rgba(34, 211, 238, 0.1);
  border-radius: var(--radius-btn);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
}

.app-item:hover {
  background: rgba(34, 211, 238, 0.05);
  border-color: var(--primary-cyan);
  transform: translateX(3px);
}

.app-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.app-info {
  display: flex;
  flex-direction: column;
}

.app-name {
  font-weight: 600;
  font-size: 0.88rem;
  color: #fff;
}

.app-status {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--primary-cyan);
}

/* ==========================================================================
   套餐价格对比表
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-cyber);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(12px);
}

.price-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: 0 0 35px rgba(34, 211, 238, 0.2);
}

.price-card.popular {
  border-color: var(--primary-cyan);
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.08) 0%, rgba(11, 17, 32, 0.9) 100%);
  box-shadow: 0 0 35px rgba(34, 211, 238, 0.25);
  transform: scale(1.02);
}

.price-card.popular:hover {
  transform: scale(1.02) translateY(-5px);
  box-shadow: 0 0 45px rgba(34, 211, 238, 0.4);
}

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-cyan);
  color: #020617;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 14px;
  border-radius: var(--radius-btn);
  letter-spacing: 0.5px;
  box-shadow: 0 0 15px rgba(34, 211, 238, 0.6);
}

.plan-name {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  min-height: 42px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-cyber);
}

.price-currency {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary-cyan);
}

.price-val {
  font-family: var(--font-mono);
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}

.price-cycle {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.plan-period-options {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: -8px;
  margin-bottom: 18px;
  line-height: 1.5;
  background: rgba(2, 6, 23, 0.7);
  padding: 6px 10px;
  border-radius: var(--radius-btn);
  border: 1px dashed rgba(34, 211, 238, 0.2);
}

.plan-period-options span.save {
  color: var(--secondary-purple);
  font-weight: 700;
}

.plan-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.plan-features li {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features li.strong {
  color: #fff;
  font-weight: 600;
}

.check-icon {
  color: var(--primary-cyan);
  font-weight: bold;
  flex-shrink: 0;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-cyber);
  border-radius: var(--radius-card);
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.review-card:hover {
  border-color: var(--border-hover);
  box-shadow: 0 0 25px rgba(34, 211, 238, 0.12);
  transform: translateY(-3px);
}

.stars {
  color: var(--primary-cyan);
  margin-bottom: 14px;
  letter-spacing: 2px;
  font-size: 0.9rem;
}

.review-quote {
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.6;
  margin-bottom: 18px;
}

.reviewer {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid rgba(34, 211, 238, 0.1);
}

.reviewer-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-btn);
  background: rgba(34, 211, 238, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--primary-cyan);
  border: 1px solid rgba(34, 211, 238, 0.3);
}

.reviewer-info h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
}

.reviewer-info p {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ==========================================================================
   常见问题解答 (FAQ)
   ========================================================================== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-cyber);
  border-radius: var(--radius-btn);
  margin-bottom: 12px;
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

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

.faq-item[open] {
  border-color: var(--primary-cyan);
  background: rgba(11, 17, 32, 0.9);
}

.faq-question {
  padding: 18px 22px;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-icon {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  color: var(--primary-cyan);
  transition: transform 0.25s ease;
}

.faq-item[open] .faq-icon {
  transform: rotate(45deg);
  color: var(--secondary-purple);
}

.faq-answer {
  padding: 0 22px 20px;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* 底部行动召唤条 */
.bottom-cta-banner {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
  border: 1px solid var(--primary-cyan);
  border-radius: var(--radius-card);
  padding: 48px 36px;
  text-align: center;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 35px rgba(34, 211, 238, 0.15);
}

.bottom-cta-banner h3 {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.bottom-cta-banner p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 26px;
  font-size: 1rem;
}

/* ==========================================================================
   页脚 (Footer) - 严格遵循只保留4个标题且新页面打开要求
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-cyber);
  background: #01040f;
  padding: 44px 0 28px;
  margin-top: 60px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  font-family: var(--font-mono);
}

.footer-nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 6px 12px;
  border-radius: var(--radius-btn);
  transition: var(--transition);
}

.footer-nav-link:hover {
  color: var(--primary-cyan);
  background: rgba(34, 211, 238, 0.08);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

/* ==========================================================================
   独立子页面内容样式 (关于我们 / 隐私 / 条款 / 网站地图 / 知识科普)
   ========================================================================== */
.subpage-container {
  max-width: 860px;
  margin: 50px auto 90px;
  padding: 0 24px;
}

.subpage-header {
  border-bottom: 1px solid var(--border-cyber);
  padding-bottom: 22px;
  margin-bottom: 36px;
}

.subpage-title {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: #fff;
  text-shadow: 0 0 15px rgba(34, 211, 238, 0.35);
}

.subpage-meta {
  font-family: var(--font-mono);
  color: var(--text-dim);
  font-size: 0.85rem;
}

.subpage-content h2 {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  color: #fff;
  margin: 34px 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.subpage-content h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 18px;
  background: var(--primary-cyan);
  border-radius: 2px;
}

.subpage-content p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.subpage-content ul {
  list-style: none;
  margin-bottom: 22px;
}

.subpage-content ul li {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 10px;
  padding-left: 20px;
  position: relative;
}

.subpage-content ul li::before {
  content: "•";
  position: absolute;
  left: 4px;
  color: var(--primary-cyan);
  font-weight: bold;
}

.highlight-box {
  background: rgba(34, 211, 238, 0.05);
  border-left: 3px solid var(--primary-cyan);
  padding: 16px 20px;
  border-radius: 0 var(--radius-btn) var(--radius-btn) 0;
  margin: 22px 0;
  color: var(--text-main);
  font-size: 0.95rem;
}

/* 知识科普专栏 9篇SEO精选文章卡片流 */
.wiki-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 28px 0 40px;
}

.wiki-article-card {
  background: rgba(11, 17, 32, 0.75);
  border: 1px solid var(--border-cyber);
  border-radius: var(--radius-card);
  padding: 22px 24px;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.wiki-article-card:hover {
  background: rgba(15, 23, 42, 0.9);
  border-color: var(--primary-cyan);
  transform: translateY(-2px);
  box-shadow: 0 0 25px rgba(34, 211, 238, 0.15);
}

.article-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.article-card-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--primary-cyan);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.3);
  padding: 2px 8px;
  border-radius: 2px;
}

.article-card-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}

.article-card-title {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
  line-height: 1.45;
}

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

.article-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}

.article-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding-top: 10px;
  border-top: 1px solid rgba(34, 211, 238, 0.1);
}

.article-read-btn {
  color: var(--primary-cyan);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.article-read-btn:hover {
  text-decoration: underline;
}

/* 文章内链推荐卡片盒 */
.related-articles-box {
  background: rgba(11, 17, 32, 0.6);
  border: 1px solid var(--border-cyber);
  border-radius: var(--radius-card);
  padding: 22px 24px;
  margin: 36px 0 28px;
}

.related-articles-title {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: #fff;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.related-articles-title::before {
  content: "🔗";
  font-size: 1rem;
}

.related-articles-list {
  list-style: none;
  margin-bottom: 0 !important;
}

.related-articles-list li {
  padding-left: 20px !important;
  margin-bottom: 10px !important;
  font-size: 0.95rem !important;
}

.related-articles-list li::before {
  content: "→" !important;
  color: var(--primary-cyan) !important;
}

.related-articles-list a {
  color: var(--primary-cyan);
  text-decoration: underline;
  transition: var(--transition);
}

.related-articles-list a:hover {
  color: #fff;
}

.back-home-bar {
  margin-bottom: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
}

/* ==========================================================================
   响应式媒体查询 (Mobile & Tablet)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
    text-align: center;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-cta-group {
    justify-content: center;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .support-container {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    gap: 26px;
  }
  
  .price-card.popular {
    transform: none;
  }
  
  .price-card.popular:hover {
    transform: translateY(-5px);
  }
  
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 640px) {
  .header {
    padding: 10px 0;
  }
  
  .nav-links {
    display: none;
  }
  
  .hero-section {
    padding: 40px 0 30px;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .neural-core-wrapper {
    width: 290px;
    height: 290px;
    transform: scale(0.85);
  }
  
  .hero-subtitle {
    font-size: 1rem;
    margin-bottom: 24px;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }
  
  .section-padding {
    padding: 55px 0;
  }
  
  .section-title {
    font-size: 1.65rem;
  }
  
  .app-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  
  .footer-nav-link {
    display: block;
    width: 100%;
    padding: 10px;
  }
}

/* ==========================================================================
   网站地图 (sitemap.html) 架构与内链增强样式
   ========================================================================== */
.sitemap-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 16px 0 28px;
}

.sitemap-item {
  background: rgba(11, 17, 32, 0.6);
  border: 1px solid var(--border-cyber);
  border-radius: var(--radius-card);
  padding: 14px 18px;
  transition: var(--transition-fast);
}

.sitemap-item:hover {
  background: rgba(15, 23, 42, 0.85);
  border-color: rgba(34, 211, 238, 0.45);
  transform: translateX(3px);
}

.sitemap-text-link {
  color: var(--primary-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.sitemap-text-link:hover,
.sitemap-text-link:focus-visible {
  color: #fff;
  text-shadow: 0 0 8px rgba(34, 211, 238, 0.5);
}

.sitemap-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 6px;
  line-height: 1.55;
}

.sitemap-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--primary-purple);
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid rgba(168, 85, 247, 0.3);
  padding: 1px 6px;
  border-radius: 2px;
  margin-right: 8px;
}

/* ==========================================================================
   无障碍：系统减弱动态效果支持 (prefers-reduced-motion)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .pcb-trace,
  .pcb-node,
  .neural-line-purple,
  .neural-line-cyan,
  .neural-node,
  .orbit-track,
  .center-lightning-bolt,
  .cyber-glow-cyan,
  .cyber-glow-purple,
  .badge-pulse {
    animation: none !important;
  }
}