* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

main {
    max-width: 480px;
    margin: 2rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #059C43;
    margin-bottom: 0.35rem;
}

.intro {
    text-align: center;
    color: #666;
    margin-bottom: 1.5rem;
}

.field {
    margin-bottom: 0.35rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

input {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: #059C43;
}

input.invalid {
    border-color: #e53935;
}

.error {
    display: block;
    color: #e53935;
    font-size: 0.85rem;
    min-height: 0.8em;
    margin-top: 0.2rem;
}

.btn-submit {
    width: 100%;
    padding: 0.75rem;
    background: #059C43;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 0.5rem;
    transition: background 0.2s;
}

.btn-submit:hover {
    background: #047a35;
}

#payment-section {
    margin-top: 2rem;
    text-align: center;
}

#payment-section h2 {
    color: #059C43;
    margin-bottom: 0.35rem;
}

.btn-swish {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: #059C43;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    margin-top: 1rem;
    transition: background 0.2s;
}

.btn-swish:hover {
    background: #047a35;
}

#qrcode-swish {
    display: inline-block;
    margin-top: 1rem;
    padding: 1rem;
    background: #fff;
    border: 2px solid #eee;
    border-radius: 8px;
}

.hidden {
    display: none;
}

@media (max-width: 540px) {
    main {
        margin: 1rem;
        padding: 1.5rem;
    }
}