:root {
  --primary: #007bff;
  --primary-hover: #0056b3;
  --secondary: #6c757d;
  --background: #f8f9fa;
  --text: #212529;
  --success: #28a745;
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  --border-radius: 6px;
}

body {
  font-family: 'Arial', sans-serif;
  margin: 0;
  padding: 0;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

main {
  flex: 1;
  padding-bottom: 2rem;
}

h1 {
  font-size: 1.75rem;
  margin: 0 auto 1.5rem;
  color: var(--primary);
  text-align: center;
  max-width: 600px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 500px;
  margin: 2rem auto;
  padding: 1.5rem;
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

label {
  display: flex;
  flex-direction: column;
  font-weight: 600;
  font-size: 1rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="tel"] {
  padding: 0.75rem;
  font-size: 1rem;
  border: 1px solid #ced4da;
  border-radius: var(--border-radius);
  transition: border-color 0.2s;
}

input:focus {
  border-color: var(--primary);
  outline: none;
}

input[type="checkbox"] {
  margin-right: 0.5rem;
  vertical-align: middle;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background 0.2s ease;
  box-shadow: var(--shadow);
}

button:hover {
  background: var(--primary-hover);
}

p.error {
  color: #dc3545;
  font-size: 0.9rem;
  margin: 0.5rem 0;
  text-align: center;
}

.qr-container {
  max-width: 300px;
  margin: 1rem auto;
  text-align: center;
}

.qr-container svg {
  width: 100%;
  height: auto;
}

.pay-container, .success-container {
  max-width: 500px;
  margin: 2rem auto;
  padding: 1.5rem;
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  text-align: center;
}

.success-container h1 {
  color: var(--success);
}

nav {
  background: var(--primary);
  padding: 1rem;
  text-align: center;
  box-shadow: var(--shadow);
}

nav a {
  color: white;
  font-weight: 600;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  transition: background 0.2s;
}

nav a:hover {
  background: var(--primary-hover);
}

.payments-table {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1.5rem;
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.payments-table table {
  width: 100%;
  border-collapse: collapse;
}

.payments-table th, .payments-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid #dee2e6;
}

.payments-table th {
  background: #e9ecef;
  font-weight: 600;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

@media (max-width: 600px) {
  h1 {
    font-size: 1.5rem;
  }
  form, .pay-container, .success-container, .payments-table {
    margin: 1rem;
    padding: 1rem;
    max-width: 100%;
  }
  button {
    padding: 0.6rem 1rem;
  }
  nav {
    padding: 0.5rem;
  }
  .payments-table th, .payments-table td {
    font-size: 0.9rem;
    padding: 0.5rem;
  }
}
.total-breakdown {
  margin: 1rem 0;
}
.total-breakdown .total {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--text);
}
.total-breakdown .breakdown {
  font-size: 0.9rem;
  color: #666;
}
.total-breakdown .breakdown p {
  margin: 0.2rem 0;
}