:root {
  --bg: #05090f;
  --surface: rgba(16, 24, 40, 0.9);
  --surface-soft: rgba(255, 255, 255, 0.05);
  --text: #f4f7ff;
  --text-muted: #9bb0d3;
  --accent: #80d4ff;
  --accent-strong: #66c7ff;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
}

body.theme-light {
  --bg: #f6f7fb;
  --surface: rgba(255, 255, 255, 0.95);
  --surface-soft: rgba(15, 23, 42, 0.05);
  --text: #0f172a;
  --text-muted: #475569;
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --border: rgba(15, 23, 42, 0.08);
  --shadow: 0 22px 42px rgba(15, 23, 42, 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: radial-gradient(circle at top left, rgba(128, 212, 255, 0.16), transparent 28%),
    radial-gradient(circle at bottom right, rgba(102, 199, 255, 0.14), transparent 25%),
    linear-gradient(180deg, var(--bg) 0%, #0d1726 100%);
  color: var(--text);
}

.page-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 8px 0 28px;
}

.brand a {
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.nav-links a,
.cta-button,
.button {
  color: var(--text);
  text-decoration: none;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: color 180ms ease;
}

.nav-links a:hover {
  color: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.icon-button,
.lang-select,
.cta-button,
.button {
  border: none;
  font: inherit;
}

.icon-button {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 160ms ease, background 160ms ease;
}

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

.lang-select {
  background: var(--surface);
  color: var(--text);
  border-radius: 14px;
  padding: 0 12px;
  height: 44px;
  box-shadow: var(--shadow);
  cursor: pointer;
}

.cta-button,
.button.primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(128, 212, 255, 0.94), rgba(102, 199, 255, 0.86));
  color: #030817;
  font-weight: 700;
  transition: transform 160ms ease, filter 160ms ease;
}

.cta-button:hover,
.button.primary:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text);
  padding: 12px 20px;
  background: transparent;
}

.hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  align-items: center;
  gap: 48px;
  padding: 72px 0 64px;
}

.eyebrow,
.section-pretitle {
  display: inline-flex;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 18px;
}

.hero-copy h1 {
  margin: 0;
  font-size: clamp(3rem, 4vw, 4.6rem);
  line-height: 0.95;
  max-width: 12ch;
}

.hero-copy p {
  max-width: 56ch;
  color: var(--text-muted);
  font-size: 1.06rem;
  line-height: 1.8;
  margin: 24px 0 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
}

.visual-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  padding: 32px;
  border-radius: 32px;
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: float 7s ease-in-out infinite;
}

.visual-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(128, 212, 255, 0.22), transparent 36%);
  pointer-events: none;
}

.visual-card__tag,
.card-tag {
  display: inline-flex;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}

.visual-card h2 {
  margin: 0 0 14px;
  font-size: 2rem;
}

.visual-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.75;
}

.grid-section,
.split-section,
.feature-section,
.contact-section {
  padding: 44px 0;
}

.section-header h2,
.feature-card h2,
.contact-card h2 {
  margin: 12px 0 0;
  font-size: clamp(2rem, 2.8vw, 3.2rem);
  line-height: 1.05;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.card,
.service-item,
.feature-card,
.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.card h3,
.service-item h3 {
  margin: 0 0 14px;
  font-size: 1.3rem;
}

.card p,
.service-item p,
.feature-card p,
.contact-card p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.75;
}

.card-link {
  display: inline-flex;
  margin-top: 18px;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease, color 160ms ease;
}

.card-link:hover {
  color: var(--accent-strong);
  border-color: var(--accent-strong);
}

.split-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: start;
}

.service-list {
  display: grid;
  gap: 18px;
}

.service-item {
  padding: 24px;
}

.feature-section {
  display: grid;
  place-items: center;
}

.feature-card {
  max-width: 820px;
}

.contact-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 32px;
}

.contact-card .button {
  white-space: nowrap;
}

.footer-bar {
  padding: 22px 0 0;
  text-align: center;
  color: var(--text-muted);
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@media (max-width: 992px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .split-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .page-shell {
    padding: 24px 18px 32px;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-links {
    justify-content: center;
    gap: 16px;
  }

  .hero-copy h1 {
    font-size: 2.7rem;
  }

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

  .contact-card {
    flex-direction: column;
    align-items: start;
  }
}