:root {
  --bg: #050809;
  --panel: #0e1417;
  --panel2: #11191d;
  --text: #f5f5f5;
  --muted: #b8c0c5;
  --orange: #f26522;
  --orange2: #ff7a18;
  --border: rgba(255,255,255,.12);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  width: 100%;
  min-height: 82px;
  padding: 18px 42px;
  display: flex;
  align-items: center;
  gap: 28px;
  background: linear-gradient(180deg, rgba(0,0,0,.82), rgba(0,0,0,.16));
  backdrop-filter: blur(8px);
}

.brand {
  color: var(--text);
  text-decoration: none;
  line-height: 1;
  display: inline-flex;
  flex-direction: column;
  min-width: 260px;
}

.brand-main {
  font-size: 44px;
  font-weight: 900;
  font-style: italic;
  letter-spacing: 4px;
}

.brand-o {
  color: var(--orange);
  text-shadow: 0 0 18px rgba(242,101,34,.8);
}

.brand-sub {
  margin-top: 8px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.brand-sub b { color: var(--orange); }

.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 34px;
}

.nav a {
  color: white;
  text-transform: uppercase;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .6px;
  padding: 8px 0;
  position: relative;
}

.nav a::after {
  content: "";
  height: 2px;
  width: 0;
  background: var(--orange);
  position: absolute;
  left: 0;
  bottom: 0;
  transition: width .25s;
}

.nav a:hover::after,
.nav a.active::after { width: 100%; }

.lang-toggle {
  border: 1px solid var(--orange);
  background: rgba(0,0,0,.35);
  color: var(--orange);
  padding: 8px 12px;
  border-radius: 4px;
  font-weight: 800;
  cursor: pointer;
}

.section { scroll-margin-top: 82px; }

.hero {
  position: relative;
  min-height: 760px;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 130px 42px 70px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url("assets/colt-concept-bg.png");
  background-size: cover;
  background-position: center top;
  opacity: .68;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(0,0,0,.95) 0%, rgba(0,0,0,.74) 38%, rgba(0,0,0,.2) 100%),
    linear-gradient(180deg, rgba(0,0,0,.15) 0%, rgba(5,8,9,.65) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 600px;
}

.hero h1 {
  margin: 0;
  text-transform: uppercase;
  font-size: clamp(34px, 4.5vw, 58px);
  line-height: 1.1;
  letter-spacing: .3px;
  font-weight: 900;
}

.hero h1::first-line { color: white; }

.hero h1 span,
.orange { color: var(--orange); }

.accent-line {
  width: 78px;
  height: 4px;
  background: var(--orange);
  margin: 28px 0;
}

.hero p {
  color: white;
  font-size: 18px;
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border-radius: 4px;
  text-transform: uppercase;
  text-decoration: none;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: .4px;
  cursor: pointer;
}

.btn.primary {
  color: white;
  background: linear-gradient(90deg, var(--orange), var(--orange2));
}

.btn.secondary {
  color: var(--orange);
  border: 1px solid var(--orange);
  background: rgba(0,0,0,.18);
}

.technology,
.advantages,
.video-section,
.contact {
  padding: 72px 42px;
  background: linear-gradient(180deg, #0a0f12, #080c0e);
  border-top: 1px solid var(--border);
}

.section-title {
  max-width: 1180px;
  margin: 0 auto 34px;
}

.section-title span,
.video-copy span,
.contact-copy span {
  color: var(--orange);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section-title h2,
.video-copy h2,
.contact-copy h2 {
  margin: 10px 0 0;
  font-size: clamp(28px, 3.5vw, 46px);
  line-height: 1.1;
  text-transform: uppercase;
}

.section-title.compact {
  text-align: center;
  margin-bottom: 28px;
  font-size: 30px;
}

.tech-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.tech-card,
.adv-grid,
.video-section,
.contact {
  border: 1px solid var(--border);
  border-radius: 8px;
}

.tech-card {
  background: rgba(255,255,255,.025);
  padding: 28px;
}

.tech-card h3 {
  color: var(--orange);
  margin: 0 0 14px;
}

.tech-card p {
  color: var(--muted);
  line-height: 1.6;
}

.adv-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  background: rgba(255,255,255,.025);
}

.adv-grid article {
  min-height: 170px;
  padding: 24px 18px;
  text-align: center;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.adv-grid article:first-child { border-left: 0; }

.icon {
  color: var(--orange);
  font-size: 42px;
  margin-bottom: 16px;
}

.adv-grid h3 {
  margin: 0;
  font-size: 14px;
  line-height: 1.45;
  text-transform: uppercase;
}

.video-section {
  max-width: 1180px;
  margin: 72px auto;
  display: grid;
  grid-template-columns: 38% 62%;
  gap: 22px;
  background: linear-gradient(135deg, #11181c, #070a0c);
}

.video-copy {
  padding: 42px;
}

.video-copy p,
.contact-copy p {
  color: var(--muted);
  line-height: 1.6;
  font-size: 16px;
}

.video-thumb {
  min-height: 320px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background-image:
    linear-gradient(rgba(0,0,0,.15), rgba(0,0,0,.42)),
    url("assets/colt-concept-bg.png");
  background-size: cover;
  background-position: center 25%;
  position: relative;
  cursor: pointer;
  margin: 16px;
}

.play {
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: rgba(0,0,0,.52);
  color: white;
  border: 2px solid white;
  display: grid;
  place-items: center;
  font-size: 30px;
  margin: auto;
}

.contact {
  max-width: 1180px;
  margin: 0 auto 34px;
  display: grid;
  grid-template-columns: 34% 66%;
  gap: 28px;
  background: linear-gradient(135deg, #10171b, #080c0e);
}

.contact-copy {
  padding: 18px 10px;
}

.contact-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  background: rgba(0,0,0,.35);
  border: 1px solid rgba(255,255,255,.22);
  color: white;
  border-radius: 4px;
  padding: 15px 16px;
  font-size: 15px;
  outline: none;
}

.contact-form textarea {
  grid-column: 1 / 3;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: var(--orange);
  box-shadow: 0 0 0 2px rgba(242,101,34,.15);
}

.contact-form button {
  grid-column: 1 / 3;
  min-height: 52px;
  border: none;
  border-radius: 4px;
  color: white;
  background: linear-gradient(90deg, var(--orange), var(--orange2));
  text-transform: uppercase;
  font-weight: 900;
  font-size: 16px;
  cursor: pointer;
}

.footer {
  padding: 28px 42px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #89939a;
  font-size: 13px;
}

.brand.small .brand-main { font-size: 28px; }
.brand.small .brand-sub { font-size: 10px; }

@media (max-width: 960px) {
  .site-header {
    position: absolute;
    flex-wrap: wrap;
    padding: 18px 22px;
  }

  .brand { min-width: 210px; }
  .brand-main { font-size: 34px; }
  .brand-sub { font-size: 10px; }

  .nav {
    order: 3;
    margin-left: 0;
    width: 100%;
    gap: 18px;
    flex-wrap: wrap;
  }

  .hero {
    padding: 170px 24px 60px;
    min-height: 720px;
  }

  .hero-bg { background-position: center top; }

  .tech-grid,
  .video-section,
  .contact {
    grid-template-columns: 1fr;
  }

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

  .adv-grid article {
    border-left: 0;
    border-top: 1px solid var(--border);
  }

  .contact-form {
    grid-template-columns: 1fr;
  }

  .contact-form textarea,
  .contact-form button {
    grid-column: auto;
  }

  .footer {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}