:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --text: #1c2530;
  --muted: #5a6672;
  --accent: #1f6feb;
  --border: #e2e7ee;
  --max: 1080px;
}

* { box-sizing: border-box; }

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

.wrap.narrow { max-width: 720px; }
.center { text-align: center; }

a { color: var(--accent); }

/* Header */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--text);
}

.logo span { color: var(--accent); }

.site-header nav {
  display: flex;
  gap: 24px;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-header nav a:hover { color: var(--text); }

/* Hero */

.hero {
  padding: 96px 0 80px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.lead {
  max-width: 620px;
  font-size: 1.125rem;
  color: var(--muted);
  margin: 0 0 32px;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 12px 24px;
  border-radius: 6px;
  font-weight: 600;
}

.btn:hover { background: #1a5fcc; }

/* Sections */

.section { padding: 72px 0; }
.section.alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section h2 {
  font-size: 1.75rem;
  letter-spacing: -0.02em;
  margin: 0 0 32px;
}

.section.alt h2,
.center h2 { margin-bottom: 16px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  background: var(--bg);
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.email {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 24px;
}

.email a {
  display: inline-block;
  color: var(--accent);
  text-decoration: none;
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-alt);
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.email a:hover,
.email a:focus-visible {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer p { margin: 0; }

.site-footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: color 0.15s ease, border-color 0.15s ease;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}