:root {
  --bg: #06101d;
  --panel: rgba(255, 255, 255, 0.075);
  --line: rgba(255, 255, 255, 0.14);
  --text: #f6f8ff;
  --muted: #a9b4c8;
  --blue: #28d7ff;
  --green: #70ffb8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 10%, rgba(40, 215, 255, 0.18), transparent 28rem),
    radial-gradient(circle at 80% 0%, rgba(112, 255, 184, 0.1), transparent 24rem),
    linear-gradient(140deg, #030712 0%, var(--bg) 52%, #090a1f 100%);
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, system-ui, sans-serif;
  line-height: 1.8;
}

a {
  color: inherit;
}

.page {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 72px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 56px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 900;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  color: #03111a;
  background: linear-gradient(135deg, var(--blue), var(--green));
  font-weight: 950;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--muted);
  font-size: 0.94rem;
}

.hero {
  margin-bottom: 28px;
}

.label {
  display: inline-flex;
  margin-bottom: 16px;
  padding: 7px 11px;
  border: 1px solid rgba(40, 215, 255, 0.34);
  border-radius: 999px;
  color: var(--blue);
  background: rgba(40, 215, 255, 0.08);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

h1 {
  margin: 0 0 14px;
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: -0.05em;
}

h2 {
  margin: 34px 0 10px;
  font-size: 1.35rem;
}

h3 {
  margin: 24px 0 8px;
  font-size: 1.05rem;
}

p,
li {
  color: var(--muted);
}

.panel {
  margin-top: 26px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.25);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
}

.card strong {
  display: block;
  margin-bottom: 6px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  margin-top: 12px;
  padding: 0 18px;
  border-radius: 999px;
  color: #03111a;
  background: linear-gradient(90deg, var(--blue), var(--green));
  text-decoration: none;
  font-weight: 900;
}

.note {
  font-size: 0.92rem;
}

footer {
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  .topbar,
  .grid {
    grid-template-columns: 1fr;
    display: grid;
  }
}