/* container اصلی */
body .container {
    background-color: #ffffff;
    padding: 20px 30px;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 945px;
    margin: 30px auto;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f7f6;
}
.chart-wrapper {
    width: 100%;
    height: 567px;
    margin-top: 30px;
    box-sizing: border-box;
    background-color: #fff;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: end;
}
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #555; }
input[type="number"], select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 16px;
}
#add-row-btn {
    background-color: #28a745;
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 24px;
    cursor: pointer;
}
#add-row-btn:disabled { background-color: #ccc; cursor: not-allowed; }
#plot-chart-btn {
    width: 100%;
    padding: 12px;
    margin-top: 10px;
    background-color: #0056b3;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
}
#status-box {
    display: none;
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
    font-size: 16px;
    transition: all 0.3s ease;
}
.status-red   { background-color: #dc3545; color: #fff; }
.status-yellow{ background-color: #ffc107; color: #000; }
.status-green { background-color: #28a745; color: #fff; }

/* ریسپانسیو */
@media (max-width: 960px) {
    .form-grid { grid-template-columns: 1fr; }
    .container, .chart-wrapper { padding: 15px; }
    .chart-wrapper { height: 60vw; min-height: 350px; }
}