:root {
  --ink: #1f2430;
  --muted: #5b6373;
  --line: #e7e9ee;
  --bg: #f7f8fa;
  --card: #ffffff;
  --blue: #2563eb;
  --purple: #534ab7;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  color: var(--ink);
  background: var(--bg);
  font: 15px/1.6 "Segoe UI", "Malgun Gothic", Arial, sans-serif;
}

a { color: inherit; text-decoration: none; }

.wrap {
  width: min(1080px, calc(100vw - 40px));
  margin: 0 auto;
}

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

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

.logo {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.2px;
}

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

nav { display: flex; gap: 28px; }

nav a {
  font-size: 14px;
  color: var(--muted);
}

nav a:hover { color: var(--ink); }

/* hero */
.hero {
  padding: 96px 0 80px;
  text-align: center;
  background: linear-gradient(180deg, #eef1ff 0%, var(--bg) 100%);
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--purple);
}

.hero h1 {
  margin: 0 0 20px;
  font-size: 38px;
  line-height: 1.35;
  letter-spacing: -0.5px;
}

.lead {
  margin: 0 auto 32px;
  max-width: 640px;
  color: var(--muted);
  font-size: 16px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--blue);
  color: #fff;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
}

.btn:hover { background: #1d4ed8; }

/* sections */
.section {
  padding: 80px 0;
}

.section.alt {
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section h2 {
  margin: 0 0 12px;
  font-size: 28px;
  letter-spacing: -0.3px;
}

.section-desc {
  margin: 0 0 36px;
  color: var(--muted);
  font-size: 15px;
  max-width: 640px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 24px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

/* footer */
.site-footer {
  padding: 28px 0;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 720px) {
  .hero h1 { font-size: 28px; }
  .cards { grid-template-columns: 1fr; }
  nav { display: none; }
}