/* Base styles and layout */
body {
  background: linear-gradient(135deg, #e3eafc 0%, #f4f4f4 100%);
  font-family: 'Sarabun', 'Inter', Arial, sans-serif;
  margin: 0;
  color: #111;
  min-height: 100vh;
}

main {
  max-width: 900px;
  margin: 10px auto 0 auto;
  padding: 0 0 60px 0;
  background: #fff;
  min-height: 80vh;
  border-radius: 30px;
  box-sizing: border-box;
  box-shadow: 0 8px 40px 0 #90caf933, 0 1.5px 8px #bdbdbd33;
  backdrop-filter: blur(2.5px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}

h1 {
  color: #111;
  text-align: center;
  font-size: 2.8rem;
  font-weight: 800;
  margin-top: 20px;
  margin-bottom: 10;
  letter-spacing: 0.01em;
  line-height: 1.1;
  text-shadow: 0 2px 8px #e3eafc;
}

h2 {
  color: #111;
  text-shadow: 0 1px 4px #e3eafc;
  margin-bottom: 12px;
  font-weight: 700;
  font-size: 2rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Global button transitions */
button, .btn-main, .btn-green, .btn-red, .btn-back, .btn-secondary, .confirm-section button {
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

button:hover, .btn-main:hover, .btn-green:hover, .btn-red:hover, .btn-back:hover, .btn-secondary:hover, .confirm-section button:hover {
  filter: brightness(1.1);
  box-shadow: 0 2px 8px #90caf944;
}