:root {
    --bg-light: #f0f0f0;
    --bg-dark: #333;
    --text-light: #000;
    --text-dark: #fff;
    --card-light: #fff;
    --card-dark: #444;
    --form-control-dark-bg: #6c757d;
    --form-control-dark-color: #fff;
    --progress-bar-dark-bg: #6c757d;
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-light);
}

.container {
    max-width: 500px;
}

.card {
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    background-color: var(--card-light);
    color: var(--text-light);
}

.balloon-container {
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.balloon {
    position: relative;
    width: 100px;
    height: 100px;
    background-color: #ff6666;
    border-radius: 50%;
    transition: width 1s ease-in-out, height 1s ease-in-out;
}

.phase-time {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5rem;
    color: white;
}

body.dark-mode {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

body.dark-mode .card {
    background-color: var(--card-dark);
    color: var(--text-dark);
}

body.dark-mode .form-control {
    background-color: var(--form-control-dark-bg);
    color: var(--form-control-dark-color);
    border-color: var(--form-control-dark-bg);
}

body.dark-mode .progress-bar {
    background-color: var(--progress-bar-dark-bg);
}

#progress-bar {
    height: 10px;
}

#progress {
    width: 0;
}

.btn {
    margin-right: 5px;
}

.custom-control-label::before,
.custom-control-label::after {
    cursor: pointer;
}

.time-cycles-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.time-cycles-container>div {
    width: 50%;
    text-align: center;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }

    .balloon-container {
        height: 150px;
    }

    .balloon {
        width: 80px;
        height: 80px;
    }
}

.volume-control-vertical {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-right: 20px;
    height: 190px;
}

.vertical-range {
    writing-mode: vertical-lr;
    direction: rtl;
    width: 8px;
    height: 150px;
    margin: 10px 0;
}

.progress-bar-vertical {
    width: 8px;
    min-height: 100px;
    display: flex;
    align-items: flex-end;
    margin-left: 20px;
    height: 150px;
}

.progress-bar-vertical .progress-bar {
    width: 100%;
    height: 0;
    transition: height 0.6s ease;
}

.ms-2 {
    margin-left: 0.5rem;
}

.modal-dialog {
    max-width: 800px;
}

.accordion-button:not(.collapsed) {
    background-color: #e7f1ff;
    color: #0c63e4;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: rgba(0, 0, 0, .125);
}