body {
    font-family: 'Segoe UI', sans-serif;
    background: #f3f6fb;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 450px;
    margin: 40px auto;
    text-align: center;
}
.poster {
    width: 100%;
    border-radius: 14px;
    margin-bottom: 20px;
    box-shadow: 0 6px 14px rgba(0,0,0,0.15);
}
h1 {
    font-size: 28px;
    margin-bottom: 20px;
}
.card {
    background: white;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    text-align: left;
}
label {
    font-weight: bold;
    margin-top: 10px;
    display: block;
}
input, select {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    border: 1px solid #d0d5dd;
    margin-top: 5px;
}
button {
    width: 100%;
    padding: 14px;
    margin-top: 20px;
    border: none;
    border-radius: 12px;
    background: #4a6cf7;
    color: white;
    font-size: 16px;
    cursor: pointer;
}
button:hover {
    background: #3c57d4;
}
.result {
    margin-top: 25px;
    text-align: center;
}
.qr {
    margin-top: 15px;
    width: 260px;
}


.amount-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-top: 15px;
}

.amount-btn {
    padding: 14px;
    border-radius: 12px;
    border: none;
    background: #f0f4ff;
    color: #1d4ed8;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.amount-btn:hover {
    background: #dbeafe;
}

.amount-btn.selected {
    background: #3b82f6;
    color: white;
    box-shadow: 0 4px 14px rgba(59,130,246,0.4);
}