/* 霓虹发光构图 + 高对比黑白基调 + 视差长图分布 + 3D发光盾牌核心 */
:root {
  --bg-black: #050505;
  --card-black: #0d0d0d;
  --pure-white: #ffffff;
  --text-gray: #a0a0a0;
  --neon-cyan: #00f3ff;
  --neon-white-glow: 0 0 15px rgba(255, 255, 255, 0.8), 0 0 30px rgba(0, 243, 255, 0.4);
  --neon-box-glow: 0 0 20px rgba(0, 243, 255, 0.25);
  --border-neon: 1px solid rgba(255, 255, 255, 0.2);
}

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

body {
  background-color: var(--bg-black);
  color: var(--pure-white);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* 霓虹背景视差网格 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 50% 20%, rgba(0, 243, 255, 0.08) 0%, transparent 60%),
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 60px 60px, 60px 60px;
  pointer-events: none;
  z-index: -1;
}

a {
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
}

ul {
  list-style: none;
}

/* 3D 发光盾牌组件 */
.shield-container {
  position: relative;
  width: 120px;
  height: 140px;
  margin: 0 auto 30px;
  perspective: 600px;
}

.shield-3d {
  width: 100%;
  height: 100%;
  position: relative;
  background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(0,243,255,0.7));
  clip-path: polygon(50% 0%, 100% 25%, 100% 70%, 50% 100%, 0% 70%, 0% 25%);
  box-shadow: var(--neon-white-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: #000;
  animation: floatShield 4s ease-in-out infinite alternate;
}

.shield-3d::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 6px;
  right: 6px;
  bottom: 6px;
  background: #000;
  clip-path: polygon(50% 0%, 100% 25%, 100% 70%, 50% 100%, 0% 70%, 0% 25%);
  z-index: 1;
}

.shield-core {
  position: relative;
  z-index: 2;
  font-size: 2.2rem;
  color: var(--neon-cyan);
  text-shadow: 0 0 10px var(--neon-cyan);
}

@keyframes floatShield {
  0% { transform: translateY(0px) rotateY(-10deg); }
  100% { transform: translateY(-15px) rotateY(10deg); }
}

/* 按钮设计 */
.neon-btn {
  display: inline-block;
  background: var(--pure-white);
  color: #000000;
  padding: 14px 36px;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 1px;
  border-radius: 4px;
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.4);
  transition: all 0.3s ease;
  border: 1px solid var(--pure-white);
  cursor: pointer;
  text-transform: uppercase;
}

.neon-btn:hover {
  background: transparent;
  color: var(--pure-white);
  box-shadow: var(--neon-white-glow);
}

.neon-btn-outline {
  background: transparent;
  color: var(--pure-white);
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.neon-btn-outline:hover {
  border-color: var(--neon-cyan);
  color: var(--neon-cyan);
  box-shadow: 0 0 20px rgba(0, 243, 255, 0.5);
}

/* Header */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 18px 6%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--pure-white);
}

.logo span {
  color: var(--neon-cyan);
  text-shadow: 0 0 10px var(--neon-cyan);
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-item {
  position: relative;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.nav-item a:hover {
  color: var(--neon-cyan);
  text-shadow: 0 0 8px var(--neon-cyan);
}

.dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--card-black);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  margin-top: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  padding: 8px 0;
}

.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  margin-top: 12px;
}

.dropdown li a {
  display: block;
  padding: 10px 20px;
  font-size: 0.9rem;
  color: var(--text-gray);
}

.dropdown li a:hover {
  color: var(--pure-white);
  background: rgba(255, 255, 255, 0.05);
}

/* Hero Section */
.hero {
  padding: 180px 6% 120px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-container {
  max-width: 1240px;
  width: 100%;
  display: flex;
  align-items: center;
  gap: 60px;
}

.hero-content {
  flex: 1.2;
}

.hero h1 {
  font-size: clamp(2.8rem, 5vw, 4.4rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero h1 span {
  background: linear-gradient(90deg, #ffffff, var(--neon-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-gray);
  margin-bottom: 40px;
  max-width: 560px;
}

.hero-ui {
  flex: 1;
  text-align: center;
}

.ui-mockup {
  background: var(--card-black);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: 30px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.8), var(--neon-box-glow);
  position: relative;
  overflow: hidden;
}

.ui-mockup::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
}

.ui-mockup img {
  width: 100%;
  max-width: 320px;
  border-radius: 8px;
  margin-bottom: 20px;
  border: 1px solid rgba(255,255,255,0.1);
}

.ui-status {
  display: flex;
  justify-content: space-around;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.ui-status span {
  display: block;
  font-size: 0.85rem;
  color: var(--text-gray);
  letter-spacing: 1px;
}

.ui-status strong {
  font-size: 1.4rem;
  color: var(--pure-white);
  font-weight: 800;
  text-shadow: 0 0 10px rgba(255,255,255,0.4);
}

/* Trust Metrics */
.trust-metrics {
  padding: 80px 6%;
  max-width: 1240px;
  margin: 0 auto;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px;
}

.metric-card {
  background: var(--card-black);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 40px 30px;
  text-align: center;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.metric-card:hover {
  border-color: var(--neon-cyan);
  box-shadow: var(--neon-box-glow);
  transform: translateY(-5px);
}

.metric-number {
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--pure-white);
  margin-bottom: 8px;
  letter-spacing: -1px;
}

.metric-card p {
  color: var(--text-gray);
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}

/* Grid Layouts */
.section-title {
  text-align: center;
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 900;
  margin-bottom: 60px;
  letter-spacing: -0.5px;
}

.section-title span {
  color: var(--neon-cyan);
}

.features, .scenarios, .pricing, .steps, .faq-reviews {
  padding: 100px 6%;
  max-width: 1240px;
  margin: 0 auto;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.grid-item {
  background: var(--card-black);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 40px 30px;
  transition: all 0.3s ease;
}

.grid-item:hover {
  border-color: rgba(255, 255, 255, 0.4);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.grid-icon {
  font-size: 2.2rem;
  margin-bottom: 20px;
  display: inline-block;
  padding: 14px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.grid-item h3 {
  font-size: 1.4rem;
  margin-bottom: 14px;
}

.grid-item p {
  color: var(--text-gray);
  font-size: 0.95rem;
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  align-items: stretch;
}

.price-card {
  background: var(--card-black);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 50px 36px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.featured-plan {
  border: 1px solid var(--neon-cyan);
  box-shadow: var(--neon-box-glow);
  transform: scale(1.03);
  background: linear-gradient(180deg, rgba(0, 243, 255, 0.05) 0%, var(--card-black) 100%);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--neon-cyan);
  color: #000;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: 20px;
  letter-spacing: 1px;
}

.price {
  font-size: 3.5rem;
  font-weight: 900;
  margin: 24px 0;
  color: var(--pure-white);
  line-height: 1;
}

.price span {
  font-size: 1rem;
  color: var(--text-gray);
  font-weight: normal;
}

.price-features {
  margin: 30px 0;
  flex-grow: 1;
}

.price-features li {
  margin-bottom: 14px;
  font-size: 0.95rem;
  color: var(--text-gray);
  position: relative;
  padding-left: 24px;
}

.price-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--neon-cyan);
  font-weight: bold;
}

/* Steps */
.steps-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 40px;
}

.step-item {
  text-align: center;
  position: relative;
}

.step-num {
  font-size: 2.2rem;
  font-weight: 900;
  width: 70px;
  height: 70px;
  line-height: 70px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.3);
  margin: 0 auto 24px;
  background: var(--card-black);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
  color: var(--neon-cyan);
}

.step-item h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.step-item p {
  color: var(--text-gray);
  font-size: 0.95rem;
}

/* FAQ & Reviews */
.faq-reviews-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.faq-item {
  background: var(--card-black);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 20px;
}

.faq-item h4 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--pure-white);
}

.faq-item p {
  color: var(--text-gray);
  font-size: 0.95rem;
}

.review-card {
  background: var(--card-black);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 30px;
  margin-bottom: 24px;
}

.stars {
  color: #ffffff;
  font-size: 1.1rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.review-card p {
  color: var(--pure-white);
  font-size: 1.05rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

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

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--neon-cyan);
}

/* Footer */
footer {
  background: #020202;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 100px 6% 40px;
}

.footer-cta {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 80px;
  padding-bottom: 80px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-cta h2 {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 900;
  margin-bottom: 20px;
}

.footer-cta p {
  color: var(--text-gray);
  margin-bottom: 36px;
  font-size: 1.1rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 50px;
  max-width: 1240px;
  margin: 0 auto;
}

.footer-col h4 {
  font-size: 1.05rem;
  margin-bottom: 20px;
  color: var(--pure-white);
  letter-spacing: 1px;
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  color: var(--text-gray);
  font-size: 0.95rem;
}

.footer-col ul li a:hover {
  color: var(--neon-cyan);
}

.footer-bottom {
  text-align: center;
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: #555555;
  font-size: 0.85rem;
}

@media (max-width: 992px) {
  .hero-container {
    flex-direction: column;
    text-align: center;
  }
  .hero p {
    margin-left: auto;
    margin-right: auto;
  }
  .faq-reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .featured-plan {
    transform: none;
  }
}

/* === perf-opt-2026 === */
header, .header {
  contain: layout;
}
.card-white, .scene-card, .pricing-card, .review-card, .blog-card,
.download-item, .faq-item, .download-card-custom, .trust-card {
  contain: layout style;
}
@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;
  }
}
@media (max-width: 980px) {
  header, .header {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
}