:root {
  color-scheme: light;
  --bg: #0f172a;
  --bg-soft: #111c37;
  --card: rgba(255, 255, 255, 0.08);
  --card-border: rgba(255, 255, 255, 0.16);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --accent: #7dd3fc;
  --shadow: 0 24px 80px rgba(15, 23, 42, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family:
    Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui,
    -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(circle at top, rgba(125, 211, 252, 0.22), transparent 38%),
    linear-gradient(180deg, var(--bg-soft), var(--bg));
  color: var(--text);
}

.page-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.card {
  width: min(680px, 100%);
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid var(--card-border);
  border-radius: 28px;
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.eyebrow {
  margin: 0 0 16px;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 4.8rem);
  line-height: 0.95;
}

h1 span {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.42em;
  font-weight: 500;
  color: var(--muted);
}

.lead {
  margin: 20px 0 0;
  max-width: 60ch;
  line-height: 1.75;
  font-size: 1.02rem;
  color: var(--muted);
}

.notes {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.notes li {
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

@media (max-width: 520px) {
  .page-shell {
    padding: 16px;
  }

  .card {
    border-radius: 22px;
  }

  .notes li {
    padding: 12px 14px;
  }
}