* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #111;
    color: white;
}

.container {
    max-width: 600px;
    margin: 60px auto;
    padding: 20px;
}

.card {
    background: #222;
    padding: 25px;
    margin: 20px 0;
    border-radius: 12px;
}

input {
    width: 100%;
    padding: 14px;
    margin: 8px 0;
    border-radius: 6px;
    border: 1px solid #555;
    font-size: 16px;
}

button {
    padding: 12px 20px;
    border: 0;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    margin: 5px;
}

.classroom {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.topbar {
    padding: 15px 20px;
    background: #1c1c1c;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.room-label {
    margin-left: 20px;
    color: #aaa;
}

.video-area {
    flex: 1;
    padding: 20px;

    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.video-box {
    position: relative;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    min-height: 300px;
}

video {
    width: 100%;
    height: 100%;
    min-height: 300px;
    object-fit: cover;
}

.video-label {
    position: absolute;
    bottom: 10px;
    left: 10px;

    background: rgba(0,0,0,.7);

    padding: 6px 10px;
    border-radius: 6px;
}

.controls {
    padding: 15px;
    text-align: center;
    background: #1c1c1c;
}

.danger {
    background: #c62828;
    color: white;
}

.info {
    padding: 15px;
    text-align: center;
    background: #222;
}

@media (max-width: 700px) {

    .video-area {
        grid-template-columns: 1fr;
    }

    .video-box {
        min-height: 220px;
    }

    video {
        min-height: 220px;
    }

}