/* ==========================================================================
   TAG Quantum Accelerator & Proxy Landing Page Stylesheet
   Theme: Quantum Entanglement · Action at a Distance · Quantum Physics
   Colors: #020617 (Deep Space Black) | #3B82F6 (Entanglement Blue) | #EC4899 (Entanglement Pink)
   Pure CSS - Zero Frameworks - High Performance & Ultra Lightweight
   ========================================================================== */

:root {
  /* 量子物理核心配色 */
  --bg-dark: #020617; /* 深空黑 */
  --bg-card: rgba(15, 23, 42, 0.78);
  --bg-card-hover: rgba(26, 38, 70, 0.85);
  --bg-card-subtle: rgba(255, 255, 255, 0.03);
  --border-color: rgba(59, 130, 246, 0.18);
  --border-focus: #3b82f6;

  --quantum-blue: #3b82f6; /* 纠缠蓝 */
  --quantum-pink: #ec4899; /* 纠缠粉 */
  --primary: #3b82f6;
  --secondary: #ec4899;

  /* 渐变与辉光体系 */
  --gradient-quantum: linear-gradient(135deg, #3b82f6 0%, #ec4899 100%);
  --gradient-brand: linear-gradient(135deg, #3b82f6 0%, #ec4899 100%);
  --blue-glow-30: 0 0 30px rgba(59, 130, 246, 0.7);
  --pink-glow-30: 0 0 30px rgba(236, 72, 153, 0.6);

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

  --radius-sm: 8px;
  --radius-md: 12px; /* 12px 标准圆角 */
  --radius-lg: 18px;
  --radius-full: 9999px;

  --container-max: 1200px;
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* 键盘可访问性：全局焦点高亮样式 (:focus-visible) */
:focus-visible {
  outline: 2px solid #60a5fa;
  outline-offset: 3px;
}

/* 键盘“跳转到主要内容”无障碍入口 (Skip to content) */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--gradient-quantum);
  color: #ffffff;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 700;
  z-index: 9999;
  text-decoration: none;
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.7);
  transition: top 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.skip-link:focus {
  top: 16px;
}

/* 锚点滚动距离修正：防止被 74px 固定页眉遮挡 */
section[id],
article[id],
div[id] {
  scroll-margin-top: 88px;
}

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-dark);
  position: relative;
  overflow-x: hidden;
}

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

img, svg {
  vertical-align: middle;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 10;
}

/* ==========================================================================
   背景动效：大型呼吸光晕 (Blur Glows) & 纠缠连线 (SVG Dashoffset Flow)
   ========================================================================== */

.quantum-ambient-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

/* 2 个大型蓝/粉 blur 光晕缓慢呼吸缩放 */
.quantum-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.45;
  will-change: transform, opacity;
}

.quantum-glow-blue {
  width: 650px;
  height: 650px;
  top: -120px;
  left: 10%;
  background: radial-gradient(circle, #3b82f6 0%, rgba(59, 130, 246, 0.15) 60%, transparent 80%);
  animation: glowBreatheBlue 8s ease-in-out infinite alternate;
}

.quantum-glow-pink {
  width: 600px;
  height: 600px;
  top: 35%;
  right: 5%;
  background: radial-gradient(circle, #ec4899 0%, rgba(236, 72, 153, 0.12) 60%, transparent 80%);
  animation: glowBreathePink 8s ease-in-out infinite alternate;
}

@keyframes glowBreatheBlue {
  0% {
    transform: scale(0.85) translate(0, 0);
    opacity: 0.35;
  }
  100% {
    transform: scale(1.18) translate(30px, 40px);
    opacity: 0.6;
  }
}

@keyframes glowBreathePink {
  0% {
    transform: scale(1.15) translate(0, 0);
    opacity: 0.55;
  }
  100% {
    transform: scale(0.82) translate(-40px, -30px);
    opacity: 0.32;
  }
}

/* 纠缠连线 SVG（蓝/粉虚线，dashoffset 流动动画） */
.quantum-svg-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  stroke-dasharray: 10 12;
  opacity: 0.55;
}

.line-dash-blue {
  stroke: #3b82f6;
  animation: dashFlowForward 14s linear infinite;
}

.line-dash-pink {
  stroke: #ec4899;
  animation: dashFlowBackward 16s linear infinite;
}

.line-dash-mixed {
  stroke: url(#quantumGradientLine);
  animation: dashFlowForward 20s linear infinite;
}

@keyframes dashFlowForward {
  from {
    stroke-dashoffset: 440;
  }
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes dashFlowBackward {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: 440;
  }
}

/* ==========================================================================
   Navigation (页眉导航)
   ========================================================================== */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background-color: rgba(2, 6, 23, 0.82);
  border-bottom: 1px solid rgba(59, 130, 246, 0.2);
  height: 74px;
  display: flex;
  align-items: center;
}

.navbar .nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-badge {
  background: var(--gradient-quantum);
  color: #fff;
  padding: 3px 12px;
  border-radius: var(--radius-md);
  font-size: 18px;
  font-weight: 900;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: #60a5fa;
  text-shadow: 0 0 12px rgba(59, 130, 246, 0.5);
}

/* ==========================================================================
   CTA 按钮体系规范 (CTA Buttons)
   规范：蓝到粉的渐变按钮，圆角 12px，带 30px 蓝色辉光
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 12px; /* 严格 12px 圆角 */
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
  border: none;
  position: relative;
  overflow: hidden;
}

/* 核心 CTA：蓝到粉渐变，12px圆角，30px蓝色辉光 */
.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #ec4899 100%);
  color: #ffffff;
  border-radius: 12px; /* 严格 12px 圆角 */
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.7); /* 严格 30px 蓝色辉光 */
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px rgba(59, 130, 246, 0.85), 0 0 45px rgba(236, 72, 153, 0.5);
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.7);
  color: var(--text-main);
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: 12px;
}

.btn-secondary:hover {
  background: rgba(59, 130, 246, 0.12);
  border-color: rgba(236, 72, 153, 0.5);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.3);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 17px;
  font-weight: 700;
  border-radius: 12px;
}

.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
  border-radius: 12px;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   Hero Section & 右侧/量子纠缠动画组件
   排版结构：标题与内容靠左，量子纠缠动画在标题右侧
   ========================================================================== */

.hero-section {
  padding: 60px 0 45px;
  position: relative;
  text-align: left;
}

/* 2 栏左右分列布局：左侧标题与按钮，右侧量子纠缠动画 */
.hero-grid-layout {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 35px;
}

.hero-left-content {
  text-align: left;
}

.hero-right-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.35);
  color: #93c5fd;
  padding: 6px 18px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  box-shadow: 0 0 18px rgba(59, 130, 246, 0.2);
}

.hero-title {
  font-size: 46px;
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -1px;
  margin-bottom: 20px;
  text-align: left;
}

.brand-inline-tag {
  background: var(--gradient-quantum);
  color: #ffffff;
  padding: 2px 14px;
  border-radius: 12px;
  display: inline-block;
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.7);
}

.text-gradient {
  background: linear-gradient(135deg, #60a5fa 0%, #ec4899 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 17px;
  color: #cbd5e1;
  max-width: 640px;
  margin: 0 0 28px 0;
  line-height: 1.65;
  text-align: left;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  margin-bottom: 0;
  flex-wrap: wrap;
}

/* Hero 简介区 (Intro Overview) */
.hero-intro-box {
  max-width: 100%;
  margin: 0 auto 30px;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 12px;
  padding: 22px 28px;
  text-align: left;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}

.hero-intro-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: #60a5fa;
  margin-bottom: 12px;
}

.hero-intro-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 14px;
}

.hero-intro-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.intro-point {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #e2e8f0;
}

.intro-point-icon {
  color: #ec4899;
  font-weight: bold;
}

/* ==========================================================================
   【核心动画】：量子纠缠 + 超距作用 + 反向双轨旋转（放置于右侧）
   ========================================================================== */

.quantum-entangle-stage {
  position: relative;
  width: 100%;
  max-width: 380px;
  height: 280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, rgba(236, 72, 153, 0.06) 50%, transparent 72%);
  border-radius: 20px;
}

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

.quantum-orbit-1 {
  width: 240px;
  height: 240px;
  border: 1.5px dashed rgba(59, 130, 246, 0.5);
  animation: orbitRotateCW 12s linear infinite;
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.18) inset;
}

.quantum-orbit-2 {
  width: 170px;
  height: 170px;
  border: 1.5px dashed rgba(236, 72, 153, 0.5);
  animation: orbitRotateCCW 16s linear infinite;
  box-shadow: 0 0 20px rgba(236, 72, 153, 0.18) inset;
}

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

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

/* 2粒子之间的蓝粉渐变连线（超距作用模拟：缩放伸缩） */
.quantum-beam-line {
  position: absolute;
  height: 3px;
  background: linear-gradient(90deg, #3b82f6 0%, #ec4899 100%);
  border-radius: 3px;
  box-shadow: 0 0 16px rgba(59, 130, 246, 0.85), 0 0 20px rgba(236, 72, 153, 0.85);
  z-index: 5;
  animation: beamActionAtDistance 3s ease-in-out infinite;
}

@keyframes beamActionAtDistance {
  0% {
    width: 220px;
    opacity: 0.55;
    transform: scaleY(0.85);
  }
  50% {
    width: 80px;
    opacity: 1;
    transform: scaleY(1.4);
    box-shadow: 0 0 26px rgba(236, 72, 153, 0.95), 0 0 32px rgba(59, 130, 246, 0.95);
  }
  100% {
    width: 220px;
    opacity: 0.55;
    transform: scaleY(0.85);
  }
}

/* 2个纠缠粒子（蓝/粉径向渐变球体），3秒一周期，互相靠近又远离 */
.entangled-particle {
  position: absolute;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  z-index: 6;
  will-change: transform;
}

/* 蓝色粒子（左侧） */
.particle-blue {
  background: radial-gradient(circle at 35% 35%, #93c5fd 0%, #3b82f6 55%, #1e3a8a 100%);
  box-shadow: 0 0 25px #3b82f6, 0 0 38px rgba(59, 130, 246, 0.7);
  animation: entangleBlueMove 3s ease-in-out infinite;
}

@keyframes entangleBlueMove {
  0% {
    transform: translateX(-110px) scale(1);
  }
  50% {
    transform: translateX(-40px) scale(1.15);
  }
  100% {
    transform: translateX(-110px) scale(1);
  }
}

/* 粉色粒子（右侧） */
.particle-pink {
  background: radial-gradient(circle at 35% 35%, #fbcfe8 0%, #ec4899 55%, #831843 100%);
  box-shadow: 0 0 25px #ec4899, 0 0 38px rgba(236, 72, 153, 0.7);
  animation: entanglePinkMove 3s ease-in-out infinite;
}

@keyframes entanglePinkMove {
  0% {
    transform: translateX(110px) scale(1);
  }
  50% {
    transform: translateX(40px) scale(1.15);
  }
  100% {
    transform: translateX(110px) scale(1);
  }
}

/* 量子态辅助文字标注 */
.quantum-stage-label {
  position: absolute;
  bottom: 8px;
  font-size: 11px;
  letter-spacing: 1.5px;
  color: #94a3b8;
  text-transform: uppercase;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(10px);
}

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

.stat-num {
  font-size: 28px;
  font-weight: 800;
  color: #60a5fa;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
}

/* ==========================================================================
   Section Headers & Cards (保持网格与结构不变)
   ========================================================================= */

.section-wrapper {
  padding: 80px 0;
  position: relative;
  z-index: 5;
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  color: #ec4899;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  display: inline-block;
  text-shadow: 0 0 12px rgba(236, 72, 153, 0.5);
}

.section-title {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
}

/* Advantage Cards (3 Cards) */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.adv-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-quantum);
  opacity: 0;
  transition: var(--transition);
}

.adv-card:hover {
  transform: translateY(-6px);
  border-color: rgba(59, 130, 246, 0.5);
  background: var(--bg-card-hover);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.5), 0 0 25px rgba(59, 130, 246, 0.2);
}

.adv-card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: rgba(59, 130, 246, 0.14);
  color: #60a5fa;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.adv-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.adv-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* Media & AI Grid */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.unlock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 36px;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.unlock-card:hover {
  border-color: rgba(236, 72, 153, 0.45);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), 0 0 25px rgba(236, 72, 153, 0.2);
}

.unlock-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 700;
  margin-bottom: 16px;
}

.badge-purple {
  background: rgba(236, 72, 153, 0.12);
  color: #f472b6;
  border: 1px solid rgba(236, 72, 153, 0.35);
}

.badge-emerald {
  background: rgba(59, 130, 246, 0.12);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.35);
}

.unlock-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
}

.unlock-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.media-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
  transition: var(--transition);
}

.media-tag:hover {
  background: rgba(59, 130, 246, 0.12);
  border-color: rgba(59, 130, 246, 0.4);
}

/* Pricing Table */
.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-color);
  border-radius: 12px;
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.pricing-card.featured {
  border-color: #3b82f6;
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.12) 0%, rgba(15, 23, 42, 0.95) 100%);
  box-shadow: 0 0 35px rgba(59, 130, 246, 0.35);
  transform: scale(1.03);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(236, 72, 153, 0.5);
  box-shadow: 0 0 30px rgba(59, 130, 246, 0.25);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--gradient-quantum);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(236, 72, 153, 0.6);
}

.plan-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 40px;
}

.price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
}

.price-symbol {
  font-size: 20px;
  font-weight: 700;
  color: #60a5fa;
}

.price-num {
  font-size: 44px;
  font-weight: 900;
  color: #fff;
}

.price-period {
  font-size: 14px;
  color: var(--text-muted);
}

.features-list {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.features-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: #cbd5e1;
  margin-bottom: 12px;
}

.check-icon {
  color: #ec4899;
  flex-shrink: 0;
  font-weight: bold;
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.45);
  box-shadow: 0 0 25px rgba(59, 130, 246, 0.2);
}

.stars {
  color: #ec4899;
  margin-bottom: 14px;
  font-size: 14px;
  letter-spacing: 2px;
  text-shadow: 0 0 10px rgba(236, 72, 153, 0.6);
}

.review-content {
  font-size: 14px;
  color: #cbd5e1;
  line-height: 1.7;
  margin-bottom: 20px;
}

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

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--gradient-quantum);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  font-size: 14px;
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.5);
}

.author-name {
  font-size: 15px;
  font-weight: 600;
}

.author-role {
  font-size: 12px;
  color: var(--text-dim);
}

/* FAQ Section */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.faq-item:hover {
  border-color: rgba(59, 130, 246, 0.35);
}

.faq-summary {
  padding: 20px 24px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  list-style: none;
  user-select: none;
}

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

.faq-arrow {
  color: var(--text-muted);
  transition: transform 0.25s ease;
}

details[open] .faq-arrow {
  transform: rotate(180deg);
  color: #ec4899;
}

details[open] {
  border-color: rgba(236, 72, 153, 0.45);
  background: var(--bg-card-hover);
  box-shadow: 0 0 25px rgba(236, 72, 153, 0.15);
}

.faq-body {
  padding: 0 24px 22px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.75;
}

/* CTA Bottom Banner */
.cta-banner {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.18) 0%, rgba(236, 72, 153, 0.18) 100%);
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: 12px;
  padding: 50px 30px;
  text-align: center;
  margin: 60px 0;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6), 0 0 35px rgba(59, 130, 246, 0.25);
  backdrop-filter: blur(12px);
}

.cta-banner h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 12px;
}

.cta-banner p {
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 28px;
  font-size: 16px;
}

/* Footer Section */
.footer {
  margin-top: auto;
  border-top: 1px solid rgba(59, 130, 246, 0.2);
  background: #01040f;
  padding: 44px 0 36px;
  text-align: center;
  position: relative;
  z-index: 10;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 15px;
  font-weight: 600;
  color: #cbd5e1;
  transition: var(--transition);
  padding: 6px 12px;
  border-radius: 12px;
}

.footer-nav a:hover {
  color: #60a5fa;
  background: rgba(59, 130, 246, 0.1);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

.footer-copyright {
  font-size: 13px;
  color: var(--text-dim);
}

/* Inner Page (Subpage) Layout */
.subpage-header {
  padding: 60px 0 30px;
  text-align: center;
  border-bottom: 1px solid rgba(59, 130, 246, 0.2);
  background: rgba(15, 23, 42, 0.5);
  margin-bottom: 40px;
  backdrop-filter: blur(10px);
}

.subpage-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 10px;
}

.subpage-desc {
  font-size: 15px;
  color: var(--text-muted);
}

.article-content {
  max-width: 860px;
  margin: 0 auto 80px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 40px;
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.article-section {
  margin-bottom: 36px;
}

.article-section:last-child {
  margin-bottom: 0;
}

.article-section h3 {
  font-size: 20px;
  font-weight: 700;
  color: #f1f5f9;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-section h3::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 18px;
  background: linear-gradient(180deg, #3b82f6, #ec4899);
  border-radius: 2px;
}

.article-section p, .article-section ul {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
}

.article-section ul {
  padding-left: 20px;
  margin-top: 10px;
}

.article-section li {
  margin-bottom: 8px;
}

.back-home-bar {
  margin-top: 30px;
  text-align: center;
}

/* ==========================================================================
   Responsive Media Queries (@media)
   Mobile Friendly & Touch Optimized
   ========================================================================== */

@media (max-width: 1024px) {
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured {
    transform: none;
  }
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .hero-grid-layout {
    grid-template-columns: 1fr;
    gap: 30px;
    text-align: center;
  }
  .hero-left-content {
    text-align: center;
  }
  .hero-title {
    text-align: center;
  }
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
    text-align: center;
  }
  .hero-actions {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

  .navbar {
    height: auto;
    padding: 14px 0;
  }

  .navbar .nav-links {
    display: none;
  }

  .hero-section {
    padding: 50px 0 35px;
  }

  .hero-title {
    font-size: 30px;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .hero-intro-box {
    padding: 18px 16px;
    margin-bottom: 24px;
  }

  .hero-intro-grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .quantum-entangle-stage {
    max-width: 320px;
    height: 180px;
    margin-bottom: 25px;
  }

  .quantum-orbit-1 {
    width: 170px;
    height: 170px;
  }

  .quantum-orbit-2 {
    width: 120px;
    height: 120px;
  }

  @keyframes entangleBlueMove {
    0% { transform: translateX(-75px) scale(1); }
    50% { transform: translateX(-28px) scale(1.1); }
    100% { transform: translateX(-75px) scale(1); }
  }

  @keyframes entanglePinkMove {
    0% { transform: translateX(75px) scale(1); }
    50% { transform: translateX(28px) scale(1.1); }
    100% { transform: translateX(75px) scale(1); }
  }

  @keyframes beamActionAtDistance {
    0% { width: 150px; opacity: 0.55; }
    50% { width: 56px; opacity: 1; }
    100% { width: 150px; opacity: 0.55; }
  }

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

  .hero-actions .btn {
    width: 100%;
    min-height: 48px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 18px;
  }

  .stat-num {
    font-size: 24px;
  }

  .section-wrapper {
    padding: 50px 0;
  }

  .section-title {
    font-size: 26px;
  }

  .advantages-grid,
  .unlock-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .btn {
    min-height: 46px;
  }

  .cta-banner {
    padding: 36px 20px;
  }

  .cta-banner h2 {
    font-size: 24px;
  }

  .footer-nav {
    gap: 18px;
    flex-direction: row;
    justify-content: center;
  }

  .footer-nav a {
    font-size: 14px;
  }

  .article-content {
    padding: 24px 18px;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    grid-template-columns: 1fr;
  }
}

/* 动效减弱偏好适配 (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;
  }
  .quantum-glow,
  .quantum-orbit,
  .quantum-beam-line,
  .entangled-particle,
  .line-dash-blue,
  .line-dash-pink,
  .line-dash-mixed {
    animation: none !important;
  }
}