:root {
  --bg: #0b1120;
  --bg-elevated: #111827;
  --bg-card: #1a2332;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #0ea5e9;
  --accent-soft: rgba(14, 165, 233, 0.12);
  --accent-secondary: #38bdf8;
  --border: rgba(148, 163, 184, 0.15);
  --radius: 12px;
  --font-sans: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 70% 45% at 50% -10%, rgba(14, 165, 233, 0.18), transparent),
    radial-gradient(ellipse 50% 30% at 100% 0%, rgba(56, 189, 248, 0.06), transparent);
  min-height: 100vh;
}

.container {
  width: min(1080px, 92vw);
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(11, 17, 32, 0.85);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1rem;
}

.logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--accent);
  font-weight: 600;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-cta {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-secondary) !important;
  border: 1px solid rgba(14, 165, 233, 0.3);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.4rem;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
}

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

.btn-primary {
  background: var(--accent);
  color: #0b1120;
}

.btn-primary:hover {
  background: var(--accent-secondary);
}

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

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.04);
}

/* Hero */
.hero {
  padding: 4rem 0 5rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  padding: 0.3rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-secondary);
  background: var(--accent-soft);
  border-radius: 6px;
  border: 1px solid rgba(14, 165, 233, 0.25);
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 1.25rem;
}

.lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin: 0 0 2rem;
  max-width: 34rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.hero-stats strong {
  display: block;
  font-size: 1.1rem;
  color: var(--accent-secondary);
  font-weight: 600;
  font-family: var(--font-mono);
}

/* Architecture diagram */
.arch-diagram {
  padding: 2rem;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.arch-node {
  width: 100%;
  padding: 0.75rem 1rem;
  text-align: center;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

.arch-node--adc {
  border-color: rgba(14, 165, 233, 0.45);
  background: var(--accent-soft);
  color: var(--accent-secondary);
  font-weight: 600;
}

.arch-arrow {
  color: var(--text-muted);
  font-size: 0.9rem;
  opacity: 0.6;
}

/* Sections */
.section {
  padding: 4.5rem 0;
}

.section-header {
  text-align: center;
  max-width: 36rem;
  margin: 0 auto 2.5rem;
}

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

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

/* Features */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

.feature-card {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}

.feature-card:hover {
  border-color: rgba(14, 165, 233, 0.35);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.feature-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Integration */
.integration {
  background: rgba(255, 255, 255, 0.02);
  border-block: 1px solid var(--border);
}

.integration-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: start;
  max-width: 52rem;
  margin-inline: auto;
}

.integration-col {
  padding: 1.5rem;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

.integration-col h3 {
  margin: 0 0 1rem;
  font-size: 1rem;
  color: var(--accent-secondary);
}

.integration-col ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.integration-col li {
  margin-bottom: 0.4rem;
}

.integration-divider {
  align-self: center;
  font-size: 1.5rem;
  color: var(--accent);
  opacity: 0.7;
}

.integration-note {
  text-align: center;
  max-width: 40rem;
  margin: 2rem auto 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Specs */
.spec-list {
  max-width: 40rem;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.spec-item {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

.spec-label {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--accent-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.spec-value {
  color: var(--text-muted);
}

/* Contact */
.contact-inner {
  text-align: center;
  padding: 2.5rem 2rem;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid rgba(14, 165, 233, 0.2);
}

.contact-inner h2 {
  font-size: clamp(1.4rem, 3vw, 1.75rem);
  margin: 0 0 0.5rem;
}

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

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 24rem;
  margin-inline: auto;
}

.contact-form input,
.contact-form textarea {
  padding: 0.8rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-success {
  margin: 0 0 1rem;
  padding: 0.85rem 1rem;
  border-radius: 8px;
  background: rgba(14, 165, 233, 0.12);
  border: 1px solid rgba(14, 165, 233, 0.35);
  color: var(--accent-secondary);
  font-size: 0.95rem;
}

.form-note {
  margin: 1rem 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.form-note a {
  color: var(--accent-secondary);
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-brand {
  font-weight: 700;
  color: var(--text);
  margin: 0 0 0.25rem;
}

.footer-copy {
  margin: 0.15rem 0;
}

/* Mobile */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 1rem;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
  }

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

  .menu-toggle {
    display: flex;
  }

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

  .hero-visual {
    order: -1;
  }

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

  .integration-divider {
    text-align: center;
    transform: rotate(90deg);
  }

  .spec-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}