/* 平板设备 */
@media screen and (max-width: 768px) {
    .container {
        border-radius: 15px;
    }

    .header h1 {
        font-size: 2em;
    }

    .header .subtitle {
        font-size: 1em;
    }

    .content {
        padding: 20px;
    }

    .section-title {
        font-size: 1.2em;
    }

    .condition-card {
        padding: 15px;
    }

    .song-item {
        padding: 10px 12px;
    }
}

/* 手机设备 */
@media screen and (max-width: 480px) {
    body {
        padding: 10px;
    }

    .container {
        border-radius: 10px;
    }

    .header {
        padding: 20px;
    }

    .header h1 {
        font-size: 1.6em;
    }

    .header .subtitle {
        font-size: 0.9em;
    }

    .content {
        padding: 15px;
    }

    .section {
        margin-bottom: 20px;
    }

    .section-title {
        font-size: 1.1em;
        gap: 8px;
    }

    .condition-card {
        padding: 12px;
    }

    .checkbox {
        width: 20px;
        height: 20px;
    }

    .checkbox.checked::after {
        font-size: 14px;
    }

    .condition-content h3 {
        font-size: 1em;
    }

    .condition-content p {
        font-size: 0.9em;
    }

    .song-item {
        padding: 8px 10px;
        gap: 8px;
    }

    .song-jacket {
        width: 50px;
        height: 50px;
    }

    .song-meta {
        gap: 10px;
    }

    .song-artist,
    .song-bpm {
        font-size: 0.75em;
    }

    .song-checkbox {
        width: 16px;
        height: 16px;
    }

    .song-checkbox::after {
        font-size: 12px;
    }

    .song-name {
        font-size: 0.9em;
    }

    .progress-bar {
        height: 10px;
    }

    .progress-text {
        font-size: 0.85em;
    }

    .reset-btn {
        padding: 8px 16px;
        font-size: 0.9em;
    }

    .round-song-jacket {
        width: 55px;
        height: 55px;
    }

    .round-song-title {
        font-size: 0.95em;
    }

    .round-song-artist {
        font-size: 0.8em;
    }

    .round-btn {
        padding: 8px 12px;
        font-size: 0.85em;
    }

    .difficulty-selector {
        flex-direction: column;
        align-items: flex-start;
    }

    .difficulty-select {
        width: 100%;
    }
}