:root {
    color-scheme: light;
    --bg: #FEFEFA;
    --text: #1B1B1B;
    --tree-border: var(--bg);
    --link: #979797;
    --node-stroke: steelblue;
    --node-fill: #fff;
    --node-collapsed-fill: lightsteelblue;
    --btn-bg: #fff;
    --btn-border: #ccc;
    --btn-hover: #f0f0f0;
    overflow-x: hidden;
    overflow-y: hidden;
}

.darkmode {
    color-scheme: dark;
    --bg: #1B1B1B;
    --text: #FEFEFA;
    --tree-border: var(--bg);
    --link: #555;
    --node-stroke: #6eb5ff;
    --node-fill: #2a2a2a;
    --node-collapsed-fill: #3d5a80;
    --btn-bg: #2a2a2a;
    --btn-border: #555;
    --btn-hover: #333;
}

.quicksand {
  font-family: "Quicksand", sans-serif;
  font-optical-sizing: auto;
  font-style: normal;
}

body {
    margin: 0;
    font-family: "Arimo", sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.container-text {
    position: relative;
    padding: 1rem 1rem 0;
}

h1 {
    text-align: center;
    font-weight: 700;
    font-size: 3em;
    margin: 0;
}

#theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--text);
    border-radius: 10px;
    border-width: 0.2em;
    background: var(--btn-bg);
    color: var(--text);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

#theme-toggle:hover {
    background: var(--btn-hover);
}

#tree {
    display: block;
    margin: 0 auto;
    border: 1px solid var(--tree-border);
    background-color: var(--bg);
    cursor: grab;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

#tree:active {
    cursor: grabbing;
}

.node circle {
    stroke: var(--node-stroke);
    stroke-width: 3px;
    cursor: pointer;
    fill: var(--node-fill);
    transition: fill 0.2s ease, stroke 0.2s ease;
}

.node circle.collapsed {
    fill: var(--node-collapsed-fill);
}

.node text {
    font: 15px "Arimo", sans-serif;
    font-weight: 500;
    fill: var(--text);
    transition: fill 0.2s ease;
}

.link {
    fill: none;
    stroke: var(--link);
    stroke-width: 2px;
    transition: stroke 0.2s ease;
}