:root {
  --navy: #16306f;
  --navy-deep: #0f2250;
  --text: #1e293b;
  --muted: #64748b;
  --card: #ffffff;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
  min-height: 100vh;
  color: var(--text);
  line-height: 1.6;
}
.wrap { max-width: 680px; margin: 0 auto; padding: 40px 20px 60px; }
header { text-align: center; color: #fff; padding: 24px 0 32px; }
header .bubbles { font-size: 44px; letter-spacing: 6px; }
header h1 { font-size: 34px; font-weight: 900; margin-top: 10px; letter-spacing: 0.5px; }
header p.tag { color: #b9c8ea; margin-top: 6px; font-size: 17px; }
.card {
  background: var(--card);
  border-radius: 18px;
  padding: 32px 28px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}
.card h2 { font-size: 22px; margin-bottom: 12px; }
.card h3 { font-size: 17px; margin: 22px 0 6px; }
.card p { margin: 10px 0; }
.card ul { margin: 10px 0 10px 22px; }
.card li { margin: 6px 0; }
.big {
  font-size: 19px;
  font-weight: 700;
  background: #eef4ff;
  border-radius: 12px;
  padding: 14px 16px;
  margin: 16px 0;
}
.muted { color: var(--muted); font-size: 14px; margin-top: 18px; }
a { color: #2563eb; }
nav { text-align: center; margin-top: 26px; }
nav a { color: #b9c8ea; margin: 0 12px; font-size: 15px; text-decoration: none; }
nav a:hover { color: #fff; text-decoration: underline; }