:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --text: #1a1f2b;
  --muted: #5a6472;
  --accent: #2b5cff;
  --border: #e3e8ef;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

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

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

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

.nav-links a:hover {
  color: var(--accent);
}

/* Hero */
.hero {
  padding: 96px 0;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-alt), var(--bg));
}

.hero h1 {
  font-size: 3rem;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

.lead {
  font-size: 1.2rem;
  color: var(--muted);
  max-width: 620px;
  margin: 0 auto 32px;
}

/* Buttons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  transition: opacity 0.2s ease;
}

.btn:hover {
  opacity: 0.9;
}

/* Sections */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section h2 {
  font-size: 2rem;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.section p {
  color: var(--muted);
  max-width: 640px;
}

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  background: var(--bg);
}

.card h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

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

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
}

.site-footer p {
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  .hero h1 { font-size: 2.2rem; }
  .nav-links { gap: 16px; }
}