:root {
  --bg: #0b1020;
  --panel: #121a33;
  --text: #f5f7ff;
  --muted: #b9c2df;
  --line: rgba(255,255,255,.12);
  --accent: #ffb300;
  --accent2: #7dd3fc;
  --ok: #7ee787;
  --shadow: 0 18px 60px rgba(0,0,0,.32);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  background:
    radial-gradient(circle at 20% 0%, rgba(255,179,0,.16), transparent 32%),
    radial-gradient(circle at 90% 10%, rgba(125,211,252,.16), transparent 28%),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
}

a {
  color: inherit;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: rgba(11,16,32,.78);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 68px;
}

.logo {
  font-weight: 900;
  text-decoration: none;
}

.navlinks {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.navlinks a {
  text-decoration: none;
  color: var(--muted);
  font-weight: 700;
  font-size: .92rem;
}

.navlinks a:hover {
  color: var(--text);
}

.hero {
  padding: 72px 0 42px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 28px;
  align-items: center;
}

.badge {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--muted);
  background: rgba(255,255,255,.04);
  font-size: .9rem;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 4.3rem);
  line-height: 1.08;
  margin: 18px 0;
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.25;
  margin: 0 0 18px;
}

h3 {
  font-size: 1.2rem;
  margin: 0 0 10px;
}

.lead,
.card p {
  color: var(--muted);
}

.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 22px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 999px;
  padding: 13px 18px;
  text-decoration: none;
  font-weight: 900;
  cursor: pointer;
  background: var(--accent);
  color: #161000;
}

.btn.secondary {
  background: rgba(255,255,255,.08);
  color: var(--text);
  border: 1px solid var(--line);
}

.hero-card,
.card,
.notice {
  background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.035));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}

.checklist {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  display: flex;
  gap: 10px;
  color: var(--muted);
}

.checklist li::before {
  content: "✓";
  color: var(--ok);
  font-weight: 900;
}

.section {
  padding: 42px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.grid.two {
  grid-template-columns: repeat(2, 1fr);
}

.kicker {
  color: var(--accent2);
  font-weight: 900;
  letter-spacing: .08em;
  font-size: .82rem;
}

.meta,
.ad-note {
  color: var(--muted);
  font-size: .92rem;
}

.ad-note {
  background: rgba(255,255,255,.05);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  margin: 18px 0;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  color: var(--muted);
  margin-top: 40px;
}

@media (max-width: 780px) {
  .hero-grid,
  .grid,
  .grid.two {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .hero {
    padding: 34px 0 24px;
  }
}