/* Design tokens for colors, typography, and layout */
:root {
  --color-background: #0d0d0d;
  --color-surface: #151632;
  --color-surface-alt: rgba(30, 31, 75, 0.65);
  --color-primary: #2a2b68;
  --color-accent: #00ffff;
  --color-text: #f5f6ff;
  --color-text-muted: rgba(245, 246, 255, 0.72);
  --font-base: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --shadow-soft: 0 20px 40px rgba(10, 12, 40, 0.45);
  --shadow-button: 0 0 12px rgba(0, 255, 255, 0.45);
  --container-width: min(1120px, 92vw);
}

/* Base element resets and typography */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-base);
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  scroll-behavior: smooth;
}

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

p {
  margin: 0 0 1.5rem;
  color: var(--color-text-muted);
}

h1,
h2,
h3 {
  color: var(--color-text);
  margin: 0 0 1rem;
  line-height: 1.2;
}

.container {
  width: var(--container-width);
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(13, 13, 13, 0.65);
  border-bottom: 1px solid rgba(0, 255, 255, 0.08);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
}

.main-nav a {
  position: relative;
  padding-bottom: 0.35rem;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.3s ease;
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
  transform: scaleX(1);
}

/* Hero banner */
.hero {
  position: relative;
  padding: 8rem 0 6rem;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, rgba(33, 34, 80, 0.95), rgba(12, 12, 28, 0.7) 45%, rgba(0, 255, 255, 0.08));
  z-index: -2;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(200px 200px at 20% 20%, rgba(0, 255, 255, 0.3), transparent 60%),
    radial-gradient(320px 320px at 80% 30%, rgba(144, 94, 255, 0.35), transparent 70%),
    radial-gradient(400px 400px at 50% 80%, rgba(0, 255, 204, 0.2), transparent 70%);
  opacity: 0.85;
  z-index: -1;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-text {
  max-width: 540px;
}

.hero .eyebrow {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.6rem, 5vw, 3.6rem);
  margin-bottom: 1.5rem;
}

.hero .subtitle {
  font-size: 1.1rem;
  max-width: 460px;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.8rem;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.btn.primary {
  background: linear-gradient(120deg, rgba(0, 255, 255, 0.9), rgba(0, 170, 255, 0.85));
  color: #051622;
  box-shadow: var(--shadow-button);
}

.btn.secondary {
  background: transparent;
  border: 1px solid rgba(0, 255, 255, 0.4);
  color: var(--color-text);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 0 18px rgba(0, 255, 255, 0.55);
}

/* About section */
.about {
  padding: 6rem 0;
  background: linear-gradient(180deg, rgba(13, 13, 13, 1), rgba(21, 22, 50, 0.95));
}

.about-content {
  text-align: center;
}

.about-description {
  max-width: 720px;
  margin: 0 auto 3rem;
}

.feature-grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.feature-card {
  background: var(--color-surface-alt);
  border: 1px solid rgba(0, 255, 255, 0.08);
  padding: 2rem;
  border-radius: 16px;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.feature-card:hover,
.feature-card:focus-within {
  transform: translateY(-6px);
  border-color: rgba(0, 255, 255, 0.25);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.feature-card p {
  margin-bottom: 0;
}

/* Contact section */
.contact {
  padding: 6rem 0;
  background: linear-gradient(160deg, rgba(21, 22, 50, 0.95), rgba(13, 13, 13, 1));
}

.contact-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.contact-text a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.contact-form {
  margin-top: 3rem;
  padding: 2.5rem;
  background: rgba(21, 22, 50, 0.8);
  border-radius: 18px;
  border: 1px solid rgba(0, 255, 255, 0.12);
  box-shadow: var(--shadow-soft);
  display: grid;
  gap: 1.5rem;
  text-align: left;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

label {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.78);
  letter-spacing: 0.03em;
}

input,
textarea {
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid rgba(0, 255, 255, 0.1);
  background: rgba(10, 11, 30, 0.7);
  color: var(--color-text);
  font-family: var(--font-base);
  font-size: 1rem;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
  resize: vertical;
}

input:focus,
textarea:focus {
  outline: none;
  border-color: rgba(0, 255, 255, 0.5);
  box-shadow: 0 0 0 3px rgba(0, 255, 255, 0.15);
}

/* Footer */
.site-footer {
  border-top: 1px solid rgba(0, 255, 255, 0.08);
  background: rgba(8, 8, 20, 0.9);
  padding: 2rem 0;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.65);
}

/* Utility animation */
.fade-in {
  animation: fadeInUp 1.2s ease forwards;
  opacity: 0;
  transform: translateY(12px);
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }

  .hero {
    padding: 7rem 0 5rem;
  }

  .hero .subtitle {
    font-size: 1rem;
  }

  .contact-form {
    padding: 2rem;
  }
}

@media (max-width: 520px) {
  .main-nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
  }

  .container {
    padding: 0;
  }

  .contact-form {
    padding: 1.5rem;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}
.container {
  width: var(--container-width);
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header and navigation */
.site-header {