/* Duet — сайт-визитка дуэта человека и ИИ. Тёмная тема, без внешних шрифтов. */

:root {
  --bg: #0b1020;
  --bg2: #0f172a;
  --card: #131c33;
  --line: #223052;
  --text: #e6ecff;
  --muted: #9fb0d9;
  --accent: #5eead4;
  --accent2: #3b82f6;
  --grad: linear-gradient(90deg, #5eead4, #3b82f6);
  --radius: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Шапка */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 16, 32, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 12px;
  padding-bottom: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}
.brand img { width: 30px; height: 30px; }
.brand-sub {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--muted);
  display: block;
  margin-top: -4px;
}
.topbar nav { display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: 0.95rem; }
.topbar nav a { color: var(--muted); }
.topbar nav a:hover { color: var(--text); text-decoration: none; }
.topbar nav a.lang {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 2px 10px;
  color: var(--accent);
}

/* Герой */
.hero {
  background:
    radial-gradient(600px 300px at 80% -10%, rgba(59, 130, 246, 0.25), transparent),
    radial-gradient(500px 260px at 10% 110%, rgba(94, 234, 212, 0.16), transparent),
    var(--bg2);
  border-bottom: 1px solid var(--line);
  padding: 72px 0 64px;
  text-align: center;
}
.kicker {
  margin: 0 0 14px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.8rem;
  color: var(--accent);
}
.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  line-height: 1.2;
}
.hero h1 .grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead {
  max-width: 640px;
  margin: 0 auto 28px;
  color: var(--muted);
  font-size: 1.08rem;
}
.cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-block;
  border-radius: 10px;
  padding: 12px 26px;
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--grad); color: #06121f; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { border-color: var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); }

.hero-facts {
  list-style: none;
  display: flex;
  gap: 10px 28px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 34px 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 0.92rem;
}
.hero-facts li::before { content: "✓ "; color: var(--accent); }

/* Секции */
.sec { padding: 64px 0; border-bottom: 1px solid var(--line); }
.sec h2 {
  margin: 0 0 8px;
  font-size: clamp(1.4rem, 3vw, 2rem);
}
.sec-sub { margin: 0 0 30px; color: var(--muted); max-width: 680px; }

.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.card:hover { transform: translateY(-3px); border-color: #33507e; }
.card h3 { margin: 0 0 10px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.card .tag {
  display: inline-block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}
.card .more { display: inline-block; margin-top: 12px; font-size: 0.9rem; }

.note { color: var(--muted); margin-top: 26px; }

/* Как работаем */
.steps {
  list-style: none;
  counter-reset: step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.steps li {
  counter-increment: step;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.steps li::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--grad);
  color: #06121f;
  font-weight: 700;
  margin-bottom: 10px;
}
.steps h3 { margin: 0 0 6px; font-size: 1.02rem; }
.steps p { margin: 0; color: var(--muted); font-size: 0.93rem; }

/* Контакты */
#contacts .contact-row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 26px;
}
.email-big { font-size: 1.15rem; font-weight: 600; }
.btn-mini {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 0.85rem;
  cursor: pointer;
}
.btn-mini:hover { border-color: var(--accent); }

.form {
  display: grid;
  gap: 14px;
  max-width: 560px;
}
.form label { font-size: 0.9rem; color: var(--muted); display: grid; gap: 6px; }
.form input, .form textarea {
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  padding: 11px 14px;
  font: inherit;
}
.form input:focus, .form textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form textarea { min-height: 120px; resize: vertical; }
.form .hint { color: var(--muted); font-size: 0.85rem; }
#leadNote { color: var(--accent); font-size: 0.9rem; }

/* Подвал */
footer {
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
}
footer .wrap { display: flex; gap: 8px 20px; justify-content: center; flex-wrap: wrap; }

@media (max-width: 640px) {
  .topbar-in { flex-direction: column; gap: 8px; }
  .topbar nav { justify-content: center; gap: 4px 14px; font-size: 0.9rem; }
  .brand-sub { display: inline; margin-left: 6px; }
  .hero { padding: 54px 0 48px; }
  .sec { padding: 48px 0; }
}