:root {
  --bg-0: #050914;
  --bg-1: #0a1230;
  --bg-2: #081b2a;
  --text: #e7f2ff;
  --muted: #a9b8d4;
  --accent: #2de3ff;
  --accent-2: #7d6bff;
  --accent-3: #3cf2c5;
  --glass: rgba(255, 255, 255, 0.06);
  --stroke: rgba(255, 255, 255, 0.12);
  --shadow: 0 30px 60px rgba(2, 12, 28, 0.55);
  --max-width: 1200px;
}

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

body {
  margin: 0;
  font-family: "Noto Sans SC", "Space Grotesk", "PingFang SC", "Microsoft YaHei",
    sans-serif;
  color: var(--text);
  background-color: var(--bg-0);
  background-image: radial-gradient(circle at 10% 20%, rgba(45, 227, 255, 0.18), transparent 45%),
    radial-gradient(circle at 85% 10%, rgba(125, 107, 255, 0.16), transparent 45%),
    radial-gradient(circle at 70% 90%, rgba(60, 242, 197, 0.12), transparent 40%),
    linear-gradient(180deg, #050914 0%, #081523 35%, #071a2a 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background: linear-gradient(120deg, rgba(45, 227, 255, 0.08), transparent 45%),
    linear-gradient(220deg, rgba(125, 107, 255, 0.08), transparent 40%);
  mix-blend-mode: screen;
  opacity: 0.6;
  pointer-events: none;
  z-index: 0;
}

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

img {
  max-width: 100%;
  display: block;
}

.page {
  position: relative;
  z-index: 1;
  padding: 0 24px 48px;
}

.site-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}

.brand-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-family: "Orbitron", "Space Grotesk", sans-serif;
  font-size: 16px;
  letter-spacing: 1px;
  background: linear-gradient(135deg, rgba(45, 227, 255, 0.25), rgba(125, 107, 255, 0.4));
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow);
}

.brand-name {
  font-size: 18px;
  letter-spacing: 0.5px;
}

.nav {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--muted);
}

.nav a {
  position: relative;
  padding-bottom: 4px;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transition: width 0.3s ease;
}

.nav a:hover::after {
  width: 100%;
}

.btn {
  border: none;
  cursor: pointer;
  font-weight: 600;
  padding: 14px 26px;
  border-radius: 999px;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  font-size: 14px;
  letter-spacing: 0.4px;
}

.btn-primary {
  color: #021018;
  background: linear-gradient(120deg, var(--accent), var(--accent-3));
  box-shadow: 0 18px 40px rgba(45, 227, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 24px 50px rgba(45, 227, 255, 0.35);
}

.btn-ghost {
  color: var(--text);
  background: transparent;
  border: 1px solid var(--stroke);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-2px);
}

.btn-small {
  padding: 10px 18px;
  font-size: 13px;
}

.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 0 80px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(5, 12, 24, 0.65);
  color: var(--muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(32px, 4vw, 52px);
  margin: 18px 0 12px;
  font-family: "Orbitron", "Noto Sans SC", sans-serif;
  letter-spacing: 1px;
}

.lead {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.8;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
  color: var(--muted);
  font-size: 13px;
}

.hero-tags span {
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 360px;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(0);
  animation: float 8s ease-in-out infinite;
}

.orb-1 {
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(45, 227, 255, 0.3), transparent 70%);
  top: 10%;
  left: 5%;
}

.orb-2 {
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(125, 107, 255, 0.3), transparent 70%);
  bottom: 5%;
  right: 5%;
  animation-delay: -2s;
}

.panel {
  position: relative;
  z-index: 2;
  width: min(420px, 90%);
  padding: 28px;
  border-radius: 24px;
  border: 1px solid var(--stroke);
  background: rgba(8, 16, 30, 0.7);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 20px;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.panel-status {
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(45, 227, 255, 0.3);
  color: var(--accent);
  font-weight: 600;
}

.panel-metrics {
  display: grid;
  gap: 18px;
}

.metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

.metric strong {
  font-size: 16px;
  color: var(--text);
}

.panel-foot {
  margin-top: 24px;
  font-size: 12px;
  color: rgba(169, 184, 212, 0.7);
}

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 0;
}

.section-title {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 40px;
}

.section-title h2 {
  font-size: clamp(24px, 3vw, 36px);
  margin: 0;
  font-family: "Orbitron", "Noto Sans SC", sans-serif;
}

.section-title p {
  margin: 0;
  color: var(--muted);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.card {
  padding: 24px;
  border-radius: 18px;
  border: 1px solid var(--stroke);
  background: rgba(8, 16, 30, 0.6);
  box-shadow: 0 20px 40px rgba(2, 10, 24, 0.4);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 18px;
}

.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.card:hover {
  transform: translateY(-6px);
  border-color: rgba(45, 227, 255, 0.35);
}

.screens-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
}

.screen-card {
  margin: 0;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(8, 16, 30, 0.6);
  box-shadow: var(--shadow);
  transform: translateZ(0);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screen-card img {
  width: 100%;
  height: auto;
  display: block;
}

.screen-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 50px rgba(2, 12, 28, 0.6);
}

.download-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 32px;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: linear-gradient(120deg, rgba(8, 16, 30, 0.9), rgba(7, 21, 37, 0.9));
  box-shadow: var(--shadow);
}

.download-card h2 {
  margin: 0 0 10px;
  font-size: 28px;
}

.download-card p {
  margin: 0;
  color: var(--muted);
}

.faq {
  display: grid;
  gap: 16px;
}

.faq details {
  border-radius: 16px;
  border: 1px solid var(--stroke);
  background: rgba(8, 16, 30, 0.6);
  padding: 18px 20px;
}

.faq summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
}

.faq p {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 36px 0 24px;
  color: rgba(169, 184, 212, 0.7);
  font-size: 13px;
  text-align: center;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

@media (max-width: 960px) {
  .site-header {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

  .download-card {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .page {
    padding: 0 18px 40px;
  }

  .btn {
    width: 100%;
    justify-content: center;
    text-align: center;
  }

  .cta-group {
    flex-direction: column;
  }

  .hero-tags {
    gap: 8px;
  }

  .panel {
    padding: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .glow,
  .card,
  .screen-card,
  .reveal {
    animation: none;
    transition: none;
  }
}