:root {
  --bg-900: #0a1830;
  --bg-800: #0d2345;
  --bg-700: #12325f;
  --accent-500: #1f4aa6;
  --accent-600: #2f6adf;
  --text-100: #ffffff;
  --text-200: #e6ecf7;
  --text-300: #c7d3e9;
  --muted-400: #8fa4c5;
  --border-500: #233a66;
  --success: #2bb673;
  --danger: #ff4d4f;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Noto Sans, Liberation Sans, sans-serif;
  color: var(--text-100);
  background: linear-gradient(180deg, var(--bg-900) 0%, var(--bg-800) 60%, var(--bg-700) 100%);
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

h1, h2, h3 { margin: 0 0 12px; line-height: 1.2; }
p { margin: 0 0 12px; color: var(--text-200); }
a { color: var(--text-100); text-decoration: none; }

.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 24, 48, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-500);
}
.header__inner {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 16px;
  height: 64px;
}
.logo { font-weight: 700; letter-spacing: 0.5px; }
.header__phone { padding: 10px 14px; border: 1px solid var(--border-500); border-radius: 8px; }

.nav { position: relative; }
.nav__list { display: flex; gap: 20px; list-style: none; padding: 0; margin: 0; }
.nav__list a { opacity: 0.9; }
.nav__list a:hover { opacity: 1; }

.nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border-500);
  border-radius: 8px;
  background: transparent;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
}
.nav__bar { display: block; width: 26px; height: 2px; background: var(--text-100); border-radius: 2px; }

.hero { padding: 64px 0; }
.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: center;
}
.hero__content p { font-size: 18px; }
.hero__actions { display: flex; gap: 12px; margin-top: 20px; }
.hero__image img { width: 100%; height: auto; border-radius: 16px; border: 1px solid var(--border-500); box-shadow: 0 12px 40px rgba(0,0,0,0.35); }

.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 18px; border-radius: 10px; font-weight: 600; }
.btn--primary { background: var(--accent-600); color: #fff; }
.btn--primary:hover { filter: brightness(1.05); }
.btn--ghost { border: 1px solid var(--border-500); background: transparent; }

.section { padding: 64px 0; }
.section--alt { background: rgba(17, 40, 77, 0.5); }
.cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.card {
  padding: 20px;
  border: 1px solid var(--border-500);
  border-radius: 12px;
  background: #37598d99;
}
.card h3 { font-size: 18px; }
.card p { font-size: 14px; color: var(--text-300); }

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.feature { padding: 20px; border-radius: 12px; border: 1px solid var(--border-500); background: rgba(13,35,69,0.6); }
.feature h3 { font-size: 16px; }
.feature p { font-size: 14px; color: var(--text-300); }

.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.form { display: grid; gap: 16px; }
.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: grid; gap: 8px; }
.field--full { grid-column: 1 / -1; }
.field input, .field select, .field textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border-500);
  background: rgba(13,35,69,0.65);
  color: var(--text-100);
}
.field input::placeholder, .field textarea::placeholder { color: var(--muted-400); }
.checkbox { display: flex; gap: 10px; align-items: center; }
.checkbox input { width: 18px; height: 18px; }
.form__actions { display: flex; align-items: center; gap: 16px; }
.form__status { min-height: 22px; font-size: 14px; }
.form__status.success { color: var(--success); }
.form__status.error { color: var(--danger); }

.contacts__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.contacts__list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.requisites { border: 1px solid var(--border-500); border-radius: 12px; padding: 16px; background: rgba(13,35,69,0.6); }
.req { display: grid; gap: 8px; }
.req__name { font-weight: 700; }
.req__row { display: grid; grid-template-columns: 160px 1fr; gap: 12px; }

.footer { border-top: 1px solid var(--border-500); background: rgba(10,24,48,0.8); }
.footer__inner { height: 64px; display: flex; align-items: center; justify-content: space-between; }
.to-top { opacity: 0.85; }
.to-top:hover { opacity: 1; }

:focus-visible { outline: 2px solid var(--accent-600); outline-offset: 2px; }

@media (max-width: 1024px) {
  .cards { grid-template-columns: repeat(3, 1fr); }
  .features { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .header__inner { grid-template-columns: auto 1fr auto; }
  .nav__toggle { display: inline-flex; }
  .nav__list { position: absolute; right: 0; top: 56px; background: rgba(10,24,48,0.95); border: 1px solid var(--border-500); border-radius: 12px; padding: 12px; flex-direction: column; gap: 12px; min-width: 220px; display: none; }
  .nav.open .nav__list { display: flex; }
  .hero__grid { grid-template-columns: 1fr; }
  .about__grid { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr 1fr; }
  .contacts__grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .cards { grid-template-columns: 1fr; }
}