/* Light theme styles */
:root {
    --background-color: #fff;
    --text-color: #000;
}

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

#timer {
    font-size: 2em;
    margin-bottom: 1em;
}

button {
    margin-right: 10px;
}

.session {
    margin-bottom: 20px;
}

.session-description {
    margin-bottom: 10px;
}

.tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.tab-btn {
    padding: 10px 20px;
    background-color: rgb(139, 133, 140);
    color: #fff;
    text-decoration: none;
    border-radius: 5px 5px 0 0;
    margin-right: 10px;
    font-size: 14px;
    letter-spacing: 2px;
    font-weight: 400;
    text-transform: uppercase;
}

.tab-btn:hover {
    background-color: #57595b;
}

.tab-btn.active {
    background-color: #448383;
}

.tab-btn:not(.active) {
    border-bottom: 2px solid transparent;
}

.tab-btn:last-child {
    margin-right: 0;
}

/* Dark theme styles */
body.dark-theme {
    --background-color: #000;
    --text-color: #fff;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    overflow: hidden;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.comment {
    border: 1px solid #ccc;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 2px;
}

.comment i {
    font-style: italic;
}