:root {
    color-scheme: dark;
    --amber: #ffbd3f;
    --bg: #030817;
    --cyan: #4de3f2;
    --green: #78edb1;
    --line: #253656;
    --muted: #91a3bf;
    --panel: #08152b;
    --red: #ff7f9d;
    --text: #f4f8ff;
    --violet: #b69cff;
    --mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: var(--text);
    background: var(--bg);
    font-family: var(--mono);
}

button,
textarea {
    font: inherit;
}

:focus-visible {
    outline: 2px solid var(--amber);
    outline-offset: 2px;
}

.runner {
    display: grid;
    min-height: 39rem;
    grid-template-columns: minmax(0, 1.2fr) minmax(16rem, 0.8fr);
}

.editor-panel,
.console-panel {
    display: grid;
    min-width: 0;
    grid-template-rows: auto 1fr auto;
}

.console-panel {
    border-left: 1px solid var(--line);
    background: #020612;
    grid-template-rows: auto 1fr;
}

header {
    display: flex;
    min-height: 3.75rem;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.65rem 0.8rem;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.018);
}

header > div {
    display: flex;
    align-items: center;
    gap: 0.55rem;
}

h1,
h2 {
    margin: 0;
    font-size: 0.76rem;
}

.dot {
    display: inline-block;
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    box-shadow: 0 0 12px currentColor;
}

.dot--violet {
    color: var(--violet);
    background: var(--violet);
}

.dot--green {
    color: var(--green);
    background: var(--green);
}

.mode {
    padding: 0.22rem 0.4rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--cyan);
    font-size: 0.62rem;
    font-weight: 800;
}

.mode[data-mode="custom"] {
    color: var(--amber);
}

.controls {
    display: flex;
    gap: 0.4rem;
}

button {
    min-height: 2.75rem;
    padding: 0.45rem 0.65rem;
    border: 1px solid var(--line);
    border-radius: 0.42rem;
    color: var(--muted);
    cursor: pointer;
    background: var(--panel);
    font-size: 0.68rem;
    font-weight: 800;
}

button:hover {
    border-color: #526788;
    color: var(--text);
}

button.run {
    border-color: rgba(77, 227, 242, 0.55);
    color: var(--cyan);
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.55;
}

#source {
    width: 100%;
    min-height: 31rem;
    resize: none;
    padding: 1.15rem;
    border: 0;
    color: var(--text);
    background: var(--panel);
    font-size: 0.78rem;
    line-height: 1.65;
    tab-size: 4;
}

.editor-help {
    margin: 0;
    padding: 0.65rem 0.8rem;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 0.64rem;
    line-height: 1.5;
}

kbd {
    color: var(--text);
    font: inherit;
}

#output {
    max-height: 35rem;
    overflow: auto;
    margin: 0;
    padding: 0.8rem;
    list-style: none;
}

#output li {
    margin: 0 0 0.55rem;
    padding: 0.55rem 0.65rem;
    border-left: 2px solid var(--line);
    overflow-wrap: anywhere;
    color: #c5d0e6;
    background: rgba(255, 255, 255, 0.018);
    font-size: 0.72rem;
    line-height: 1.5;
    white-space: pre-wrap;
}

#output li::before {
    display: block;
    margin-bottom: 0.18rem;
    color: var(--muted);
    content: attr(data-level);
    font-size: 0.58rem;
    text-transform: uppercase;
}

#output li.log {
    border-color: var(--cyan);
}

#output li.info {
    border-color: var(--violet);
}

#output li.warn {
    border-color: var(--amber);
    color: var(--amber);
}

#output li.error {
    border-color: var(--red);
    color: #ffb5c5;
}

#output li.success {
    border-color: var(--green);
    color: var(--green);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    border: 0;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

@media (max-width: 48rem) {
    .runner {
        grid-template-columns: 1fr;
    }

    .console-panel {
        border-top: 1px solid var(--line);
        border-left: 0;
    }

    #source {
        min-height: 20rem;
    }

    #output {
        min-height: 12rem;
        max-height: 18rem;
    }
}

@media (max-width: 35rem) {
    header {
        align-items: flex-start;
        flex-direction: column;
    }

    header > div,
    .controls {
        width: 100%;
        flex-wrap: wrap;
    }

    .controls button {
        flex: 1 1 8rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
    }
}