:root {
  --bg: #ffffff;
  --bg-alt: #f5f8fa;
  --text: #13212f;
  --muted: #5d7185;
  --accent: #18b2a4;
  --accent-dark: #0c746b;
  --border: #dde5ee;
  --shadow-soft: 0 18px 45px rgba(9, 30, 66, 0.12);
  --radius-large: 18px;
  --radius-pill: 999px;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

/* Layout */

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4.5rem 0;
}

.section.alt {
  background: var(--bg-alt);
}

.section h2 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 2rem;
}

.section-intro {
  max-width: 720px;
  color: var(--muted);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(221, 229, 238, 0.9);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
}

.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo {
  width: 120px;
  height: 120px;
  object-fit: contain;
  margin-right: 0.75rem;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
}

.brand-tagline {
  font-size: 0.85rem;
  color: var(--muted);
}

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

.main-nav a {
  text-decoration: none;
  color: var(--muted);
  padding-bottom: 0.1rem;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover {
  color: var(--accent-dark);
  border-color: var(--accent);
}

/* Hero */

.hero {
  padding: 4.5rem 0 4rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2.3fr);
  gap: 2.5rem;
  align-items: center;
}

.hero h1 {
  font-size: 2.4rem;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 620px;
}

.hero-cta {
  margin: 1.75rem 0 0.75rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-note {
  font-size: 0.9rem;
  color: var(--muted);
  max-width: 520px;
}

.hero-highlight {
  display: flex;
  justify-content: flex-end;
}

.hero-card {
  background: #ffffff;
  border-radius: var(--radius-large);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(221, 229, 238, 0.8);
}

.hero-card h2 {
  font-size: 1.35rem;
  margin-top: 0;
  margin-bottom: 0.75rem;
}

.hero-card ul {
  padding-left: 1.1rem;
  margin-top: 0.5rem;
  margin-bottom: 0.75rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.coming-soon {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.coming-soon span {
  font-weight: 600;
  color: var(--accent-dark);
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.3rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease,
    border-color 0.15s ease, transform 0.05s ease;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent-dark), var(--accent));
  color: #ffffff;
  box-shadow: 0 8px 22px rgba(12, 116, 107, 0.35);
}

.btn.primary:hover {
  box-shadow: 0 12px 30px rgba(12, 116, 107, 0.45);
  transform: translateY(-1px);
}

.btn.secondary {
  background: #ffffff;
  color: var(--accent-dark);
  border-color: rgba(24, 178, 164, 0.4);
}

.btn.secondary:hover {
  background: rgba(24, 178, 164, 0.06);
}

/* Grids */

.grid {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

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

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

/* Lists and cards */

.numbered-list {
  padding-left: 1.15rem;
}

.numbered-list li {
  margin-bottom: 0.7rem;
}

.highlight-box {
  margin-top: 2.5rem;
  padding: 1.5rem 1.4rem;
  border-radius: var(--radius-large);
  background: linear-gradient(
    135deg,
    rgba(24, 178, 164, 0.06),
    rgba(3, 37, 65, 0.02)
  );
  border: 1px solid rgba(24, 178, 164, 0.25);
}

.highlight-box ul {
  padding-left: 1.1rem;
}

.highlight-box p {
  margin-top: 0.75rem;
}

.card {
  background: #ffffff;
  border-radius: var(--radius-large);
  padding: 1.35rem 1.25rem;
  border: 1px solid rgba(221, 229, 238, 0.9);
  box-shadow: 0 10px 24px rgba(9, 30, 66, 0.06);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
}

.card ul {
  padding-left: 1.1rem;
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

/* Pilot section */

.disclaimer {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: #9a5b00;
}

.submission-box {
  margin-top: 2.5rem;
  padding: 1.5rem 1.4rem;
  border-radius: var(--radius-large);
  background: #ffffff;
  border: 1px dashed rgba(24, 178, 164, 0.6);
}

.code-inline {
  font-family: "SF Mono", ui-monospace, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  background: rgba(9, 30, 66, 0.04);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  display: inline-block;
  font-size: 0.9rem;
}

/* Contact */

.contact-grid {
  align-items: flex-start;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

.contact-list li {
  margin-bottom: 0.4rem;
}

.contact-list a {
  color: var(--accent-dark);
  text-decoration: none;
}

.contact-list a:hover {
  text-decoration: underline;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: #ffffff;
  border-radius: var(--radius-large);
  padding: 1.35rem 1.25rem;
  border: 1px solid rgba(221, 229, 238, 0.9);
  box-shadow: 0 10px 24px rgba(9, 30, 66, 0.05);
}

.contact-form label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
  gap: 0.35rem;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  border-radius: 10px;
  border: 1px solid var(--border);
  padding: 0.5rem 0.6rem;
  font-family: inherit;
  font-size: 0.95rem;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(24, 178, 164, 0.24);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0;
}

/* Footer */

.site-footer {
  border-top: 1px solid rgba(221, 229, 238, 0.9);
  background: #ffffff;
  padding: 1.5rem 0;
  margin-top: 1rem;
}

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

.footer-note {
  margin-top: 0.25rem;
}

/* Responsive */

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-highlight {
    justify-content: flex-start;
  }

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

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

@media (max-width: 720px) {
  .header-inner {
    flex-direction: row;
    align-items: center;
  }

  .main-nav {
    display: none; /* для простоты – без мобильного меню */
  }

  .hero {
    padding-top: 3.25rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

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

  .section {
    padding: 3.5rem 0;
  }
}