:root {
    --background: #f6f7f9;
    --surface: #ffffff;
    --border: #d5d9e0;
    --text: #1d2330;
    --muted: #677085;
    --accent: #2f6fdb;
    --accent-text: #ffffff;
    --gutter: #eef0f4;
    --error: #c62828;
    --warning: #9a6700;
    --value: #2e7d32;
    --echo: #2f6fdb;
    --mono: ui-monospace, 'Cascadia Mono', 'Consolas', 'DejaVu Sans Mono', 'Liberation Mono', monospace;
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #15181e;
        --surface: #1c2028;
        --border: #343a46;
        --text: #dde1e8;
        --muted: #8c94a5;
        --accent: #5b93f0;
        --accent-text: #0b0e13;
        --gutter: #191c23;
        --error: #ff7b72;
        --warning: #e3b341;
        --value: #7ee787;
        --echo: #79b8ff;
    }
}

* {
    box-sizing: border-box;
}

[hidden] {
    display: none !important;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
    background: var(--background);
    color: var(--text);
    font: 14px/1.4 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

a {
    color: var(--accent);
}

.bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    padding: 8px 12px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.brand {
    font-weight: 700;
    font-size: 16px;
    text-decoration: none;
    color: var(--text);
    margin-right: 6px;
}

.brand span {
    font-weight: 400;
    color: var(--muted);
}

.spacer {
    flex: 1;
}

.group {
    display: inline-flex;
    gap: 4px;
}

.field {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--muted);
}

select, button, input, textarea {
    font: inherit;
    color: var(--text);
}

select {
    max-width: 260px;
    padding: 4px 6px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
}

.program select {
    min-width: 200px;
}

button {
    white-space: nowrap;
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--surface);
    cursor: pointer;
}

button:hover:not(:disabled) {
    border-color: var(--accent);
}

button:disabled {
    opacity: 0.45;
    cursor: default;
}

button.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
    font-weight: 600;
}

button.small {
    padding: 1px 8px;
    font-size: 12px;
}

main {
    flex: 1;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 10px;
    padding: 10px;
    min-height: 0;
}

.pane {
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.pane-title {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 8px;
    padding: 6px 10px;
    border-bottom: 1px solid var(--border);
    color: var(--muted);
    font-size: 13px;
}

#file-name {
    color: var(--text);
    font-weight: 600;
}

#modified {
    color: var(--warning);
}

#isolation {
    color: var(--warning);
}

.status.running {
    color: var(--accent);
}

.status.failed {
    color: var(--error);
}

.editor {
    flex: 1;
    display: flex;
    min-height: 0;
    position: relative;
}

#gutter, #code, #output, #line, #input {
    font-family: var(--mono);
    font-size: 13px;
    line-height: 1.45;
    tab-size: 4;
}

#gutter {
    margin: 0;
    padding: 8px 8px 8px 12px;
    min-width: 3.5em;
    text-align: right;
    color: var(--muted);
    background: var(--gutter);
    border-right: 1px solid var(--border);
    overflow: hidden;
    user-select: none;
}

#gutter .error {
    color: var(--error);
    font-weight: 700;
}

#code {
    flex: 1;
    margin: 0;
    padding: 8px 10px;
    border: 0;
    outline: none;
    resize: none;
    background: transparent;
    white-space: pre;
    overflow: auto;
}

#input-pane {
    border-top: 1px solid var(--border);
}

#input-pane summary {
    padding: 6px 10px;
    cursor: pointer;
    color: var(--muted);
    font-size: 13px;
}

.hint {
    color: var(--muted);
    font-size: 12px;
}

#input {
    display: block;
    width: 100%;
    padding: 6px 10px;
    border: 0;
    border-top: 1px solid var(--border);
    outline: none;
    resize: vertical;
    background: var(--gutter);
}

#screen {
    display: flex;
    justify-content: center;
    padding: 10px;
    border-bottom: 1px solid var(--border);
    background: #000;
    max-height: 60%;
}

#canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    image-rendering: pixelated;
}

#console {
    flex: 1;
    overflow: auto;
    padding: 8px 10px;
    min-height: 0;
}

#output {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    display: inline;
}

#output .stderr, #output .error {
    color: var(--error);
}

#output .warning {
    color: var(--warning);
}

#output .value {
    color: var(--value);
}

#output .echo {
    color: var(--echo);
}

#output .note {
    color: var(--muted);
    font-style: italic;
}

#output .error a {
    color: inherit;
}

#prompt {
    display: inline;
}

#line {
    width: 60%;
    min-width: 8em;
    padding: 0;
    border: 0;
    border-bottom: 1px dashed var(--echo);
    outline: none;
    background: transparent;
    color: var(--echo);
}

.small-print {
    border-top: 1px solid var(--border);
    border-bottom: 0;
    padding: 4px 12px;
    font-size: 12px;
    color: var(--muted);
}

@media (max-width: 800px) {
    main {
        grid-template-columns: minmax(0, 1fr);
        grid-template-rows: minmax(300px, 1fr) minmax(250px, 1fr);
    }

    select {
        max-width: 180px;
    }
}