:root {
    --bg: #f6f7f9;
    --surface: #ffffff;
    --text: #1d2330;
    --muted: #5d6677;
    --border: #d9dde5;
    /* LapViz orange (logo). */
    --accent: #E8702D;
    --ok: #1d7a3e;
    --warn: #9a6200;
    --error: #b3261e;
    color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14171d;
        --surface: #1d2129;
        --text: #e6e8ec;
        --muted: #9aa3b2;
        --border: #333a46;
        --ok: #5cc27f;
        --warn: #e0a84a;
        --error: #ff8a80;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.top-bar {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.top-bar nav { display: flex; gap: 1rem; }
.top-bar a { color: var(--text); text-decoration: none; }
.top-bar a.active { color: var(--accent); font-weight: 600; }
.brand { display: flex; align-items: center; flex: none; }
/* The logo sets the height of the bar; its width follows (400 x 88). */
.brand img { display: block; height: 2rem; width: auto; }
.top-bar { flex-wrap: wrap; row-gap: 0.5rem; }
@media (max-width: 420px) {
    .brand img { height: 1.6rem; }
}

.content { max-width: 46rem; margin: 0 auto; padding: 1rem; }

h1 { font-size: 1.5rem; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
}

.tools { display: grid; gap: 1rem; }
.tool { display: block; color: inherit; text-decoration: none; }
.tool h2 { margin-top: 0; font-size: 1.1rem; color: var(--accent); }
.tool { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1rem; }

button {
    font: inherit;
    padding: 0.55rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
}

button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button:disabled { opacity: 0.5; cursor: default; }

.actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1rem; }

.status {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.85rem;
    border: 1px solid var(--border);
}

.status.ok { color: var(--ok); border-color: var(--ok); }
.status.busy { color: var(--warn); border-color: var(--warn); }
.status.error { color: var(--error); border-color: var(--error); }

.alert { padding: 0.75rem 1rem; border-radius: 6px; border: 1px solid; margin: 1rem 0; }
.alert.error { color: var(--error); border-color: var(--error); }
.alert.ok { color: var(--ok); border-color: var(--ok); }
.alert.info { color: var(--muted); border-color: var(--border); }

.muted { color: var(--muted); }
/* Space before a span that follows text: Razor drops a leading space inside an element. */
.spaced { margin-left: 0.5em; }

dl.facts { display: grid; grid-template-columns: max-content 1fr; gap: 0.25rem 1rem; margin: 0; }
dl.facts dt { color: var(--muted); }
dl.facts dd { margin: 0; }

.code-input {
    font-size: 2rem;
    letter-spacing: 0.4em;
    width: 9em;
    text-align: center;
    padding: 0.3rem;
    font-variant-numeric: tabular-nums;
}

.field { display: grid; gap: 0.25rem; margin-bottom: 1rem; }
.field label { font-weight: 600; }
.field input[type=text], .field input[type=number], .field select { font: inherit; padding: 0.4rem; max-width: 20rem; }
.field .help { font-size: 0.85rem; color: var(--muted); }
.field .problem { font-size: 0.85rem; color: var(--error); }
/* A yes/no setting: its label and its box on one line, the help below. */
.field.bool { grid-template-columns: 1fr auto; align-items: center; column-gap: 0.75rem; }
.field.bool input[type=checkbox] { width: 1.3rem; height: 1.3rem; margin: 0; }
.field.bool .help, .field.bool .problem { grid-column: 1 / -1; }
.field.invalid input, .field.invalid select { border-color: var(--error); }

/* Circuit preview (CircuitMap.razor). */
.circuit-map { display: grid; gap: 0.5rem; margin-top: 0.25rem; }
.circuit-map-canvas { height: min(60vh, 26rem); border: 1px solid var(--border); border-radius: 6px; background: #20242c; }
.circuit-map-legend { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.2rem; font-size: 0.9rem; }
.circuit-map-legend .swatch { display: inline-block; width: 1.4rem; height: 0.35rem; margin-right: 0.4rem; vertical-align: middle; border: 1px solid #000; }
.circuit-map-label { font-weight: 600; padding: 0 0.3rem; }

.loading { text-align: center; margin-top: 4rem; color: #888; }

#blazor-error-ui {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.75rem 1rem;
    background: #fff3cd;
    color: #5c4400;
}

#blazor-error-ui .dismiss { cursor: pointer; float: right; }

h1:focus { outline: none; }

/* Circuits of the device (CircuitsPanel.razor) and circuit editor (CircuitEditor.razor). */
.circuits-panel h3 { font-size: 1rem; margin: 1.5rem 0 0.25rem; }
.circuit-list { list-style: none; margin: 0.5rem 0; padding: 0; display: grid; gap: 0.5rem; }
.circuit-row { display: flex; gap: 0.5rem; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.row-actions { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.confirm { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; margin-top: 0.4rem; color: var(--error); }
.inline-form { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.inline-form select { font: inherit; padding: 0.4rem; flex: 1 1 14rem; min-width: 0; max-width: 100%; }
label.check { display: flex; gap: 0.5rem; align-items: flex-start; margin: 0.5rem 0 1rem; }

.circuit-editor { padding: 0.75rem; }
.circuit-editor .problem { color: var(--error); }
.ce-search { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 0.5rem 0; }
.ce-search input { font: inherit; padding: 0.45rem; flex: 1 1 12rem; min-width: 0; }
.ce-results { list-style: none; margin: 0 0 0.5rem; padding: 0; display: grid; gap: 0.25rem; }
.ce-results button { width: 100%; text-align: left; font-size: 0.9rem; }
.ce-toolbar { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 0.5rem; }
.ce-hint { margin: 0.5rem 0; font-size: 0.9rem; color: var(--muted); min-height: 1.4em; }
/* Tall on a phone, where the map is most of the work. */
.ce-map { height: min(70vh, 34rem); border: 1px solid var(--border); border-radius: 6px; background: #20242c; touch-action: none; }
.ce-map.ce-placing { cursor: crosshair; }
.ce-lines { list-style: none; margin: 0.75rem 0 0.25rem; padding: 0; display: grid; gap: 0.35rem; }
.ce-lines li { display: flex; align-items: center; gap: 0.5rem; padding: 0.35rem 0.5rem; border: 1px solid var(--border); border-radius: 6px; cursor: pointer; }
.ce-lines li.selected { border-color: var(--accent); }
.ce-lines .swatch { flex: none; width: 1.4rem; height: 0.4rem; border: 1px solid #000; }
.ce-line-text { display: grid; flex: 1 1 auto; min-width: 0; font-size: 0.9rem; }
.ce-line-actions { display: flex; gap: 0.25rem; flex: none; }
.ce-line-actions button { padding: 0.35rem 0.6rem; min-width: 2.4rem; }

/* Handles on the map: a Leaflet marker of size 0, the visible dot centered on it. */
.ce-handle-anchor { background: none; border: none; }
.ce-handle {
    position: absolute;
    left: -11px;
    top: -11px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--handle-color);
    border: 3px solid #000;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.8);
    cursor: grab;
}
.ce-handle-corner { border-radius: 3px; background: rgba(255, 255, 255, 0.85); }
.ce-handle-pending { background: #fff; border-color: var(--accent); animation: ce-pulse 1s ease-in-out infinite alternate; }
@keyframes ce-pulse { from { transform: scale(0.8); } to { transform: scale(1.15); } }
/* Fingers: larger handles. */
@media (pointer: coarse) {
    .ce-handle { left: -16px; top: -16px; width: 32px; height: 32px; }
}

/* Circuit picker (CircuitPicker.razor): a text field and the circuits that match. */
.picker { position: relative; flex: 1 1 16rem; min-width: 0; max-width: 28rem; }
.picker input { font: inherit; font-size: max(1rem, 16px); padding: 0.45rem; width: 100%; }
.picker-list {
    position: absolute;
    z-index: 1000;
    left: 0;
    right: 0;
    margin: 2px 0 0;
    padding: 0.25rem 0;
    list-style: none;
    max-height: min(18rem, 50vh);
    overflow-y: auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}
.picker-list li[role=option] { padding: 0.45rem 0.6rem; cursor: pointer; }
.picker-list li.active { background: color-mix(in srgb, var(--accent) 18%, transparent); }
.picker-list li.selected span:first-child { font-weight: 600; }
.picker-group { padding: 0.35rem 0.6rem 0.15rem; font-size: 0.8rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.picker-empty { padding: 0.45rem 0.6rem; color: var(--muted); }

/* Phones: the margins of the page, of a card and of a card inside a card added up to
   about 90 px of a 360 px screen. Smaller margins, and a card inside a card loses its frame. */
@media (max-width: 600px) {
    .content { padding: 0.5rem; }
    .top-bar { padding: 0.5rem 0.75rem; }
    .card { padding: 0.75rem; margin: 0.75rem 0; }
    .card .card { padding: 0; margin: 0.5rem 0; border: none; background: none; }
    .field input[type=text], .field input[type=number], .field select { max-width: none; width: 100%; }
    .picker { max-width: none; }
    .actions { gap: 0.5rem; }
    h1 { font-size: 1.3rem; margin: 0.5rem 0; }
    .card h2 { font-size: 1.15rem; margin: 0 0 0.5rem; }
    .card .card h2 { font-size: 1.05rem; }
}