:root {
    --background: rgb(38, 38, 38);
    --text: rgb(255, 255, 255);
    --border: rgb(45, 45, 45);
    --button-hover: rgb(4, 78, 14);
    --button-bg: rgb(5, 116, 20);
}

body {
    background: var(--background);
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    height: 100vh;
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    box-sizing: border-box;
}

#header {
    background-color: var(--background);
    color: var(--text);
    height: 10vh;
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2vw;
}

#title {
    font-size: 2rem;
}

img {
    max-height: 100%;
}

#startInterval {
    background-color: var(--background);
    color: var(--text);
    height: 85vh;
    display: now;
    align-items: center;
    justify-content: center;
    text-align: center;
}

#select{
    color:black;
}

#choose{
    width: 15vw;
    height: 10vw;
    line-height: 10vw;
    size: 30px;
    background-color: var(--border);
    padding: 1rem;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#choose:hover {
    background-color: rgb(50,50,50);
}

#chooseInterval {
    background-color: var(--background);
    color: var(--text);
    height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

#startButton {
    background-color: var(--button-bg);
    color: var(--text);
    width: 20vw;
    height: 40vh;
    padding: 1rem;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#startButton:hover {
    background-color: var(--button-hover);
}

/* Core flexbox container setup */
#interval {
    display: none;
    flex-direction: row;
    justify-content: space-between;
    align-items: stretch;
    height: 85vh;
    width: 100vw; /* Ensure container spans full width */
    background-color: var(--background);
    color: var(--text);
    border: 2px solid var(--border);
    padding: 1rem;
    box-sizing: border-box;
    flex-wrap: nowrap; /* Prevent wrapping */
}

/* Child elements in the flex container */
#tableDiv, #countdown, #targetPower {
    flex: 1; /* Make all divs take equal width */
    margin: 0.5rem; /* Margin between divs */
    padding: 1rem;
    border: 2px solid var(--border);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-sizing: border-box;
}

#tableDiv {
    font-size: 3rem;
}

#power, #time {
    text-align: center;
    font-size: 8vw; /* Scales with viewport width */
    margin-top: 10vh; /* Centers text vertically */
}

.even {
    background-color: var(--border);
}

/* Media Queries for smaller screens */
@media (max-width: 768px) {
    #interval {
        flex-direction: column; /* Stack divs vertically on smaller screens */
    }

    #tableDiv, #countdown, #targetPower {
        flex-basis: 100%; /* Full width for each div in stacked layout */
    }

    #power, #time {
        font-size: 15vw; /* Increase font size on smaller screens */
    }
}