.solar-card {
    max-width: 780px;
    margin: 50px auto;
    padding: 38px;
    background: linear-gradient(135deg, #fffdf0, #ffffff);
    border-radius: 28px;
    box-shadow: 0 30px 70px rgba(0,0,0,0.12);
    font-family: system-ui, sans-serif;
}

.solar-card h1 {
    text-align: center;
    margin-bottom: 30px;
}

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

input, select {
    width: 100%;
    margin-top: 6px;
    padding: 14px;
    border-radius: 12px;
    border: 1px solid #ccc;
    font-size: 15px;
}

input[type="checkbox"] {
    width: auto;
    margin-right: 8px;
}

small {
    display: block;
    margin-top: 4px;
    color: #666;
    font-size: 13px;
}

button {
    margin-top: 32px;
    width: 100%;
    padding: 18px;
    background: #ff9800;
    color: #fff;
    border: none;
    border-radius: 20px;
    font-size: 18px;
    cursor: pointer;
}

button:hover {
    background: #e68900;
}

#solarResult {
    margin-top: 30px;
    background: #f4fff1;
    padding: 26px;
    border-radius: 22px;
    font-weight: 600;
    line-height: 1.9;
}

.note {
    margin-top: 22px;
    font-size: 13px;
    color: #666;
}