body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: radial-gradient(circle at top, #1e293b, #020617);
  color: #e5e7eb;
  margin: 0;
  padding: 40px 20px;
  line-height: 1.7;
}

/* container */
.container {
  max-width: 900px;
  margin: auto;
  background: rgba(17, 24, 39, 0.85);
  padding: 50px 40px;
  border-radius: 20px;
  backdrop-filter: blur(12px);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(255, 255, 255, 0.05);
}

.container:hover {
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.8),
    0 0 0 1px rgba(255, 255, 255, 0.08);
}

/* headings */
h1 {
  font-size: 36px;
  text-align: center;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

h2 {
  margin-top: 40px;
  font-size: 22px;
  color: #f9fafb;
  position: relative;
  padding-left: 14px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 4px;
  height: 18px;
  background: #3b82f6;
  border-radius: 4px;
}

/* subtitle */
.subtitle {
  text-align: center;
  color: #9ca3af;
  margin-bottom: 30px;
  font-size: 14px;
}

/* text */
p {
  margin: 12px 0;
  color: #d1d5db;
}

ul {
  padding-left: 20px;
  margin: 10px 0 20px 0;
}

li {
  margin: 6px 0;
  color: #cbd5f5;
}

strong {
  color: #ffffff;
}

/* email/link */
.email {
  color: #60a5fa;
  font-weight: 500;
  text-decoration: none;
}

/* app title underline */
.app-title {
  position: relative;
  display: block;
  width: fit-content;
  margin: 0 auto 10px auto;
  text-align: center;
}

.app-title::after {
  content: "";
  display: block;
  width: 100%;
  height: 3px;
  margin: 10px auto 0;
  background: linear-gradient(90deg, #3b82f6, #60a5fa);
  border-radius: 2px;
}

/* mobile */
@media (max-width: 600px) {
  .container {
    padding: 30px 20px;
  }

  h1 {
    font-size: 28px;
  }
}