* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f5f5f4;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: #1c1c1c;
}
.card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    padding: 2.5rem;
    width: 100%;
    max-width: 380px;
    text-align: center;
}
h1 { font-size: 1.4rem; margin: 0 0 1.5rem; }
label { display: block; text-align: left; font-size: 0.85rem; margin: 1rem 0 0.35rem; color: #555; }
input, textarea {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
}
textarea { resize: vertical; min-height: 4.5rem; }
button {
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.75rem;
    border: none;
    border-radius: 8px;
    background: #6366f1;
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: not-allowed; }
.error { color: #dc2626; font-size: 0.85rem; margin-top: 0.75rem; }
.amount { font-size: 2rem; font-weight: 700; margin: 0.5rem 0; }
.reason { color: #555; }