/* styles.css — BongMath Premium Style */
body {
  font-family: 'Helvetica Neue', 'Pretendard', sans-serif;
  background: linear-gradient(180deg, #0a0f2c, #1b1f3b, #0f141f);
  color: #e8ebf7;
  margin: 0;
  padding: 0;
  text-align: center;
}

header {
  padding: 60px 0 20px;
}

.logo {
  width: 120px;
  height: auto;
  margin-bottom: 15px;
  filter: drop-shadow(0 0 8px rgba(255,255,255,0.3));
}

h1 {
  font-size: 2.5em;
  color: #8ccfff;
  letter-spacing: 0.5px;
}

h2 {
  color: #cdd3ff;
  margin-top: 10px;
  font-weight: 400;
}

a.btn {
  display: inline-block;
  margin-top: 25px;
  padding: 12px 28px;
  background: linear-gradient(90deg, #3a9cff, #6bbaff);
  color: white;
  text-decoration: none;
  border-radius: 30px;
  font-weight: 600;
  transition: all 0.3s ease;
}

a.btn:hover {
  background: linear-gradient(90deg, #6bbaff, #3a9cff);
  box-shadow: 0 0 15px rgba(100, 160, 255, 0.6);
}

footer {
  margin-top: 60px;
  padding: 20px;
  font-size: 0.9em;
  color: #9fa4b7;
}