styles.css

body {
  min-height: 100vh;
  background: linear-gradient(135deg, #f8e1ff 0%, #e3f6fd 100%);
  font-family: 'Segoe UI', 'Arial', sans-serif;
  margin: 0;
  padding: 0;
}

.container {
  width: 95%;
  max-width: 560px;
  padding: 32px 10px 18px 10px;
  border-radius: 26px;
  box-shadow: 0 4px 32px 0 rgba(179,136,255,0.10);
  background: linear-gradient(120deg, #fdf6fb 0%, #e4f2fb 100%);
  margin: 40px auto;
  min-height: 480px;
}

h2, h1 {
  text-align: center;
  color: #b388ff;
  margin-bottom: 0.5em;
  letter-spacing: -1px;
}

.subtitle {
  text-align: center;
  color: #a7b6c9;
  margin-bottom: 1.2em;
}

.centered-form {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.form-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 20px;
}



.centered-form .quantity-group {
  margin-bottom: 25px;
}

.centered-select {
  width: 100%;
  max-width: 500px;
  min-width: 0;
  box-sizing: border-box;
  margin: 0 auto 8px auto;
  border-radius: 10px;
  border: 1px solid #d1e3fa;
  padding: 9px 14px;
  font-size: 1em;
  background: #f4f7fa;
  box-shadow: 0 2px 12px 0 rgba(179,136,255,0.08);
}

input[type="text"], input[type="email"], input[type="password"] {
  width: 60px;
  border-radius: 10px;
  border: 1px solid #d1e3fa;
  padding: 7px 10px;
  font-size: 1em;
  background: #f4f7fa;
  box-shadow: 0 1px 6px 0 rgba(179,136,255,0.08);
}

input[type="email"], input[type="password"] {
  width: 90%;
  max-width: 400px;
}

#card_number, #card_type {
  width: 80%;
  max-width: 400px;
}

.small-btn{
  color: #fff;
  border: none;
  padding: 6px 14px;
  font-size: 0.98em;
  font-weight: 500;
  box-shadow: 0 2px 12px 0 rgba(179,136,255,0.13);
  cursor: pointer;
  transition: background 0.18s, box-shadow 0.18s, transform 0.13s;
  margin: 2px 2px;
  min-width: 100px;
}

.small-btn:hover {
  background: linear-gradient(90deg, #ae7fff 0%, #4fc3f7 100%);
  box-shadow: 0 4px 18px 0 rgba(129,212,250,0.16);
  transform: translateY(-2px) scale(1.04);
}

input[type="submit"], input[type="button"] {
  background: #b388ff;
  color: white;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 500;
  font-size: 0.98em;
  box-shadow: 0 2px 8px 0 rgba(179,136,255,0.10);
  transition: background 0.18s, box-shadow 0.18s;
}

input[type="submit"]:hover, input[type="button"]:hover {
  background: #9d6eea;
  box-shadow: 0 4px 14px 0 rgba(179,136,255,0.14);
}

.remove-btn {
  background: linear-gradient(90deg, #ffb3c6 0%, #b388ff 100%);
  color: #fff;
  border: none;
  border-radius: 14px;
  padding: 6px 12px;
  font-size: 0.97em;
  font-weight: 600;
  box-shadow: 0 1px 7px 0 rgba(255,179,198,0.13);
  cursor: pointer;
  margin: 0 3px;
  transition: background 0.18s, box-shadow 0.18s, transform 0.13s;
  min-width: 90px;
}

.remove-btn:hover {
  background: linear-gradient(90deg, #ff80ab 0%, #ae7fff 100%);
  box-shadow: 0 4px 14px 0 rgba(255,179,198,0.16);
  transform: translateY(-2px) scale(1.04);
}

.success-message {
    background: #b7eacb;
    color: #258a5b;
    border-radius: 8px;
    padding: 10px 0;
    margin-bottom: 14px;
    text-align: center;
    font-size: 1.1em;
    font-weight: 600;
    box-shadow: 0 1px 6px 0 rgba(60,160,60,0.06);
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.5s, transform 0.5s, height 0.5s;
    height: 0;
}
.success-message.show {
    height: 30px;
    opacity: 1;
    transform: translateY(0);
}

.centered-btn-row {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 22px 0 0 0;
  padding-top: 10px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 18px;
  margin-bottom: 18px;
  background: #f8fbff;
  border-radius: 16px;
  box-shadow: 0 1px 12px 0 rgba(179,136,255,0.06);
  overflow: hidden;
}

th, td {
  padding: 12px 8px;
  text-align: center;
  border-bottom: 1px solid #e3eaf4;
}

th {
  background: #e3eaf4;
  color: #b388ff;
  font-size: 1.07em;
}

tr:last-child td {
  border-bottom: none;
}

footer {
  margin-top: auto;  /* This pushes the footer to the bottom of the container */
  position: relative;
  bottom: 0;
  color: #aaa;
  padding: 8px;
}

.error {
  color: #258a5b;
  font-size: 1.1em;
  font-weight: 600;
  text-align: center;
  display: none;
}

hr {
  margin: 30px 0;
  border: none;
  border-top: 2px solid #bde0fe;
}