:root {
  --bg: #06090f;
  --surface: #0f1722;
  --surface-alt: #111b2a;
  --accent: #4c6ef5;
  --accent-soft: rgba(76, 110, 245, 0.1);
  --text: #f5f7fa;
  --text-muted: rgba(245, 247, 250, 0.7);
  --border: rgba(255, 255, 255, 0.08);
  --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background: radial-gradient(circle at top, rgba(76, 110, 245, 0.2), transparent 50%), var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

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

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

.container {
  width: min(1120px, 90vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(6, 9, 15, 0.75);
  border-bottom: 1px solid var(--border);
}

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

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.04em;
}

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

.nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-muted);
}

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

.btn {
  border: none;
  border-radius: 999px;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #4c6ef5, #845ef7);
  color: white;
  box-shadow: 0 20px 40px rgba(76, 110, 245, 0.25);
}

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

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.16);
}

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

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.3);
}

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

.hero__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 3rem;
  align-items: center;
}

.hero__content h1 {
  font-size: clamp(2.8rem, 5vw, 3.8rem);
  margin-bottom: 1.25rem;
}

.hero__content .lead {
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.75rem;
  margin-bottom: 1rem;
}

.cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.trusted {
  display: grid;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.trusted__logos {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
}

.hero__panel .panel {
  background: var(--surface);
  padding: 2rem;
  border-radius: 1.5rem;
  border: 1px solid var(--border);
  box-shadow: 0 40px 80px rgba(12, 16, 27, 0.6);
}

.panel__hint {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.panel__form {
  display: grid;
  gap: 1rem;
}

.panel__form label {
  display: grid;
  gap: 0.5rem;
  font-size: 0.9rem;
}

input,
textarea,
select {
  background: var(--surface-alt);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.75rem;
  padding: 0.85rem 1rem;
  color: var(--text);
  font: inherit;
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid rgba(76, 110, 245, 0.6);
  outline-offset: 2px;
}

.panel__note {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.section {
  padding: 5rem 0;
}

.section--alt {
  background: rgba(17, 27, 42, 0.6);
}

.section__title {
  font-size: 2.25rem;
  margin-bottom: 2.5rem;
  text-align: center;
}

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

.feature {
  background: rgba(255, 255, 255, 0.04);
  padding: 1.75rem;
  border-radius: 1.25rem;
  border: 1px solid var(--border);
  display: grid;
  gap: 1rem;
}

.feature__icon {
  font-size: 1.75rem;
}

.timeline {
  display: grid;
  gap: 1.5rem;
  margin-inline: auto;
  max-width: 720px;
}

.timeline__step {
  display: flex;
  gap: 1.5rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 1.5rem;
  border-radius: 1.25rem;
  border: 1px solid var(--border);
}

.step__number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.ai-lab {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 3rem;
  align-items: center;
}

.list {
  display: grid;
  gap: 1rem;
  color: var(--text-muted);
}

.list strong {
  color: var(--text);
}

.code-block {
  background: #070b12;
  border-radius: 1rem;
  border: 1px solid rgba(76, 110, 245, 0.3);
  padding: 1.5rem;
  box-shadow: 0 30px 60px rgba(9, 14, 24, 0.6);
}

.code-block pre {
  white-space: pre-wrap;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.9rem;
}

.code-block__caption {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.faq {
  display: grid;
  gap: 1.5rem;
  max-width: 780px;
  margin: 0 auto;
}

.faq__item {
  background: rgba(255, 255, 255, 0.04);
  border-radius: 1rem;
  border: 1px solid var(--border);
  padding: 1.5rem;
}

.faq__item h3 {
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: rgba(6, 9, 15, 0.9);
  padding: 2.5rem 0;
  color: var(--text-muted);
}

.site-footer .container {
  display: grid;
  gap: 1rem;
  align-items: center;
  justify-items: center;
  text-align: center;
}

.logo--footer {
  font-size: 1.5rem;
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__tagline {
  color: var(--text);
  margin-top: 0.5rem;
}

.footer__note {
  font-size: 0.85rem;
}

.modal {
  position: fixed;
  inset: 0;
  display: none;
}

.modal.is-visible {
  display: block;
}

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(6, 9, 15, 0.8);
  backdrop-filter: blur(12px);
}

.modal__dialog {
  position: relative;
  margin: 10vh auto;
  background: var(--surface);
  border-radius: 1.5rem;
  padding: 2.5rem;
  max-width: 420px;
  border: 1px solid var(--border);
  box-shadow: 0 40px 80px rgba(5, 9, 15, 0.7);
}

.modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.modal__form {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.modal__form label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.9rem;
}

.modal__checkbox {
  display: flex !important;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.modal__footnote {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.simulation-output {
  margin-top: 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 1rem;
  padding: 1.25rem;
  border: 1px solid var(--border);
  color: var(--text-muted);
  min-height: 80px;
}

@media (max-width: 960px) {
  .hero__grid,
  .ai-lab {
    grid-template-columns: 1fr;
  }

  .nav {
    display: none;
  }

  .site-header .container {
    justify-content: space-between;
  }
}

@media (max-width: 640px) {
  .hero {
    padding-top: 5rem;
  }

  .panel {
    padding: 1.5rem;
  }

  .modal__dialog {
    margin-inline: 1rem;
  }
}