* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fa;
    color: #1f2937;
}

.container {
    width: 100%;
    max-width: 700px;
    margin: 60px auto;
    padding: 20px;
}

.card {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

h1 {
    margin-top: 0;
}

.subtitle {
    color: #6b7280;
    margin-bottom: 30px;
}

label {
    display: block;
    margin-top: 18px;
    margin-bottom: 6px;
    font-weight: 600;
}

input {
    width: 100%;
    padding: 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 16px;
}

button {
    margin-top: 24px;
    padding: 12px 18px;
    border: 0;
    border-radius: 6px;
    background: #111827;
    color: white;
    font-size: 16px;
    cursor: pointer;
}

button:hover {
    opacity: 0.9;
}

button.secondary {
    margin-top: 0;
    background: #6b7280;
}

.header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.error {
    color: #dc2626;
    margin-top: 15px;
}

.hidden {
    display: none;
}

hr {
    border: 0;
    border-top: 1px solid #e5e7eb;
    margin: 25px 0;
}

.stripe-element {
    padding: 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    background: white;
    margin-bottom: 5px;
}

select {
    width: 100%;
    padding: 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 16px;
    background: white;
}

.mode-description {
    color: #6b7280;
    font-size: 14px;
    line-height: 1.5;
}

.result {
    margin-top: 20px;
}

.result-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #e5e7eb;
}

.result-label {
    font-weight: 600;
}