:root {
  --bg: #0c1020;
  --surface: rgba(255, 255, 255, 0.06);
  --text: #f4f6ff;
  --muted: #b6bedb;
  --accent: #6a8bff;
  --accent-2: #a874ff;
  --border: rgba(255, 255, 255, 0.15);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", "Noto Sans JP", sans-serif;
  background: radial-gradient(circle at 10% 20%, #1c2855 0%, var(--bg) 60%);
  color: var(--text);
  line-height: 1.7;
}

.bg-decoration {
  position: fixed;
  inset: auto -180px -180px auto;
  width: 420px;
  aspect-ratio: 1;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  filter: blur(90px);
  opacity: 0.55;
  pointer-events: none;
  z-index: -1;
}

.site-header,
main {
  width: min(1040px, 92%);
  margin: 0 auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
}

.logo {
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: 0.05em;
}

.site-nav {
  display: flex;
  gap: 18px;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 500;
}

.hero {
  padding: 72px 0 44px;
}

.tag {
  margin: 0 0 12px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.06em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.2;
}

.lead {
  margin-top: 20px;
  max-width: 680px;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: #fff;
}

.btn-secondary {
  border-color: var(--border);
  color: var(--text);
  background: var(--surface);
}

.section {
  margin: 44px 0;
}

h2 {
  margin: 0 0 20px;
  font-size: 1.7rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  backdrop-filter: blur(8px);
}

.card-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.card h3 {
  margin: 10px 0 8px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.about p,
.contact p {
  margin: 0;
  color: var(--muted);
  max-width: 760px;
}

.contact a {
  color: #d4dcff;
}

@media (max-width: 768px) {
  .site-header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }

  .hero {
    padding-top: 40px;
  }
}