:root {
  --bg: #0a1428;
  --bg-elev: #101d37;
  --text: #e6f7ff;
  --muted: #9ec7d8;
  --accent: #00f0ff;
  --accent-2: #7c5cff;
  --card-border: rgba(255, 255, 255, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 10%, rgba(124, 92, 255, 0.25), transparent 30%),
    radial-gradient(circle at 80% 0%, rgba(0, 240, 255, 0.2), transparent 25%),
    var(--bg);
  line-height: 1.6;
}

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

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

.section {
  padding: 4.5rem 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 20, 40, 0.8);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 1rem;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 1.2rem;
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 0.18rem;
  background: rgba(16, 29, 55, 0.72);
}

.lang-btn {
  background: transparent;
  border: 0;
  color: var(--muted);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  cursor: pointer;
}

.lang-btn.active {
  color: #00121a;
  background: linear-gradient(90deg, var(--accent), #78fbff);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-weight: 600;
  padding: 0.72rem 1.2rem;
  transition: transform 0.2s ease, opacity 0.2s ease, background-color 0.2s ease;
  border: 1px solid transparent;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  color: #00121a;
  background: linear-gradient(90deg, var(--accent), #78fbff);
}

.btn-secondary {
  color: var(--text);
  background: transparent;
  border-color: rgba(0, 240, 255, 0.4);
}

.desktop-cta {
  white-space: nowrap;
}

.full {
  width: 100%;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: calc(100vh - 72px);
  display: flex;
  align-items: center;
}

.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: rgba(0, 240, 255, 0.5);
  animation: drift linear infinite;
}

@keyframes drift {
  from { transform: translateY(0) translateX(0); opacity: 0.2; }
  50% { opacity: 0.75; }
  to { transform: translateY(-80px) translateX(12px); opacity: 0.15; }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0.2rem 0 1rem;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.lead {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 64ch;
}

.meta-line,
.small-note {
  color: var(--muted);
  font-size: 0.9rem;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.3rem;
}

.glass-card {
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--card-border);
  border-radius: 16px;
  padding: 1.3rem;
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.25);
}

.highlight-card ul,
.glass-card ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.section-title {
  margin-bottom: 1.2rem;
}

.card-grid {
  display: grid;
  gap: 1rem;
}

.card-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card-grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.price {
  color: var(--accent);
  font-weight: 600;
  margin-top: 0.8rem;
}

.two-col {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tech-strip {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.tech-strip span {
  border: 1px solid rgba(0, 240, 255, 0.25);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  color: var(--muted);
}

.cta-panel {
  text-align: center;
}

.page-intro {
  margin-bottom: 1rem;
}

.contact-form {
  display: grid;
  gap: 0.5rem;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(16, 29, 55, 0.8);
  color: var(--text);
  padding: 0.62rem 0.7rem;
  font: inherit;
}

.table-wrap {
  overflow-x: auto;
}

.roadmap-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

.roadmap-table th,
.roadmap-table td {
  text-align: left;
  padding: 0.75rem 0.65rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--muted);
}

.roadmap-table th {
  color: var(--text);
  font-weight: 600;
}

.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 2rem 0 1rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.footer-actions {
  display: flex;
  gap: 0.7rem;
}

.legal {
  margin-top: 1.2rem;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.9rem;
  gap: 1rem;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.show {
  opacity: 1;
  transform: translateY(0);
}

html[data-lang="en"] .lang-zh {
  display: none !important;
}

html[data-lang="zh"] .lang-en {
  display: none !important;
}

@media (max-width: 980px) {
  .hero-grid,
  .card-grid.four,
  .card-grid.two,
  .two-col {
    grid-template-columns: 1fr;
  }

  .desktop-cta {
    display: none;
  }

  .menu-toggle {
    display: inline-block;
  }

  .nav-links {
    position: absolute;
    top: 72px;
    right: 4%;
    background: rgba(10, 20, 40, 0.98);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 0.8rem 1rem;
  }

  .nav-links.open {
    display: flex;
  }

  .footer-grid,
  .legal {
    flex-direction: column;
    align-items: flex-start;
  }
}