section#tool {
    min-height: 90vh;
}

.preview {
    background-color: var(--text-color);
    border: var(--text-color) solid 1px;
    margin: 0 auto 1em;
    width: 100%;
    max-width: 60vh;
    aspect-ratio: 1;
}

.block {
    aspect-ratio: 1;
    position: relative;
    min-width: 0;
    min-height: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.block.filled { background-color: var(--accent-color); }
.block.empty { background-color: var(--background-color); }

.adjust-btn {
    background-color: var(--accent-color);
    color: black;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
    transition: transform 0.1s, filter 0.1s;
    flex-shrink: 0;
}

.adjust-btn:active {
    transform: translateY(-50%) scale(0.95);
}

.adjust-btn:hover {
    filter: brightness(1.05);
}

input.static-input {
    width: 4em;
    height: 40px;
    text-align: center;
    font-size: 1.2em;
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: none;
    padding: 0 0.5em;
    background-color: var(--background-color);
    color: var(--gray);
    font-weight: bolder;
}

.range-container {
    position: relative;
    width: 100%;
    margin: 1em auto 1em;
    padding: 0 52px;
    display: flex;
    align-items: center;
}

.range-container #size-range {
    width: 100%;
}

.range-container output {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    pointer-events: none;
}

.range-container .adjust-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}

#radius-minus {
    left: 0;
}

#radius-plus {
    right: 0;
}

.segment-label{
    padding: 0.2em;
    background-color: var(--accent-color);
    border-radius: 12px;
    box-shadow: none;
    z-index: 1;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 24px;
    background: var(--background-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    margin-top: -8px;
    background: var(--thumb-bg, var(--accent-color)) center / contain no-repeat;
    height: 40px;
    width: 40px;
    border: none;
    border-radius: 8px;
    box-shadow: var(--shadow);
    cursor: pointer;
}

input[type="range"]::-moz-range-track {
    width: 100%;
    height: 24px;
    background: var(--background-color);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

input[type="range"]::-moz-range-thumb {
    background: var(--thumb-bg, var(--accent-color)) center / contain no-repeat;
    height: 40px;
    width: 40px;
    border: none;
    border-radius: 8px;
    box-shadow: var(--shadow);
    cursor: pointer;
}