/* Medium screens (tablets, small laptops) */
@media (max-width: 1024px) {
    body {
        padding: 16px;
    }

    .container {
        border-radius: 10px;
    }

    .charts-section {
        padding: 30px 24px;
    }

    .stats {
        padding: 24px;
    }

    .energy-summary {
        margin: 20px 24px;
    }

    .threshold-controls,
    .alerts,
    .error,
    .progress-section {
        margin-inline: 24px;
    }
}

/* Tablets & large phones */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        border-radius: 10px;
    }

    .header {
        padding: 22px 16px;
        text-align: left;
    }

    h1 {
        font-size: 1.9em;
    }

    .subtitle {
        font-size: 0.95em;
    }

    .upload-section,
    .charts-section {
        padding: 22px 16px;
    }

    .stats {
        grid-template-columns: 1fr;
        gap: 12px;
        padding: 20px 16px;
    }

    .energy-summary {
        margin: 20px 16px;
        padding: 20px;
        text-align: left;
    }

    .energy-grid {
        grid-template-columns: 1fr;
    }

    .threshold-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .threshold-controls,
    .alerts,
    .error,
    .progress-section {
        margin-inline: 16px;
    }

    .chart-header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }

    .chart-controls {
        align-self: flex-start;
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
        row-gap: 8px;
    }

    .chart-btn {
        padding-inline: 12px;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    .control-btn {
        width: 100%;
        max-width: 280px;
        margin-inline: auto;
    }

    canvas {
        max-height: 320px;
    }
}

/* Small phones */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .container {
        margin: 6px;
        border-radius: 8px;
    }

    .header {
        padding: 18px 14px;
    }

    h1 {
        font-size: 1.6em;
    }

    .subtitle {
        font-size: 0.9em;
    }

    .upload-section,
    .charts-section {
        padding: 18px 14px;
    }

    .stats {
        padding: 16px 14px;
    }

    .energy-summary {
        margin: 16px 14px;
        padding: 18px 14px;
    }

    .threshold-controls,
    .alerts,
    .error,
    .progress-section {
        margin-inline: 14px;
    }

    .chart-title {
        font-size: 1.05em;
    }

    .control-btn,
    .chart-btn {
        font-size: 0.85em;
    }

    .file-label {
        width: 100%;
        text-align: center;
        padding-inline: 20px;
    }
}