:root {
  --bg: #ffffff;
  --bg-alt: #f4f6fa;
  --text: #1c2230;
  --muted: #5f6b7e;
  --accent: #3b6cf6;
  --accent-text: #ffffff;
  --border: #e1e5ee;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c;
    --bg-alt: #181c25;
    --text: #e8ebf2;
    --muted: #98a2b5;
    --border: #272d3a;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 70px; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
a { color: var(--accent); }
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.container--narrow { max-width: 760px; }

.header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.nav { display: flex; gap: 24px; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 500; }
.nav a:hover, .nav a.active { color: var(--accent); }
.nav-toggle, .burger { display: none; }

.hero {
  position: relative;
  min-height: calc(100vh - 64px);
  display: flex; align-items: center; text-align: center;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 14%, var(--bg)), var(--bg));
}
.hero--small { min-height: 60vh; }
.hero h1 { font-size: clamp(2rem, 6vw, 3.6rem); margin: 0 0 16px; line-height: 1.15; }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 620px; margin: 0 auto 32px; }
.scroll-hint {
  position: absolute; bottom: 24px; left: 50%; transform: translateX(-50%);
  font-size: 1.6rem; text-decoration: none; color: var(--muted);
  animation: bounce 2s infinite;
}
@keyframes bounce { 0%,100% { transform: translate(-50%, 0); } 50% { transform: translate(-50%, 8px); } }

.btn {
  display: inline-block; padding: 12px 28px;
  background: var(--accent); color: var(--accent-text);
  border-radius: 999px; text-decoration: none; font-weight: 600;
  transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 18px color-mix(in srgb, var(--accent) 40%, transparent); }

.block { padding: 88px 0; }
.block--alt { background: var(--bg-alt); }
.block h2 { font-size: 2rem; margin: 0 0 8px; }
.block h1 { font-size: 2.4rem; margin: 0 0 24px; }
.muted { color: var(--muted); margin: 0 0 40px; }
#cta { text-align: center; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-bottom: 40px; }
.cards--contacts { margin-top: 32px; }
.card {
  padding: 24px; background: var(--bg);
  border: 1px solid var(--border); border-radius: var(--radius);
}
.card h3 { margin: 0 0 8px; font-size: 1.1rem; }
.card p { margin: 0; color: var(--muted); }

.page { min-height: 60vh; }
.content h2 { margin-top: 32px; }

.footer { border-top: 1px solid var(--border); padding: 24px 0; color: var(--muted); font-size: .9rem; }
.footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

@media (max-width: 640px) {
  .burger { display: block; cursor: pointer; padding: 10px; }
  .burger span, .burger span::before, .burger span::after {
    display: block; width: 22px; height: 2px; background: var(--text); position: relative; content: "";
  }
  .burger span::before { position: absolute; top: -7px; }
  .burger span::after { position: absolute; top: 7px; }
  .nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--border);
  }
  .nav a { padding: 14px 20px; }
  .nav-toggle:checked ~ .nav { display: flex; }
  .block { padding: 56px 0; }
}