/* Colour tokens follow multising's (~/multising/public/style.css), so the two
   wizbiz.ooo sites look related. */
:root {
    color-scheme: dark;
    --bg: #11151a;
    --surface: #1a2027;
    --surface-2: #212a33;
    --surface-3: #2a3540;
    --border: #28313b;
    --text: #e8edf2;
    --muted: #8da0b3;
    --dim: #5d6b7a;
    --accent: #ffd27a;
    --accent-text: #ffd27a;
    --accent-ink: #2a1f00;
    --bad: #ff8a8a;
    --bar: #5a6d80;
    --bar-tail: #36424e;
    --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: light) {
    :root {
        color-scheme: light;
        --bg: #f5f3ee;
        --surface: #ffffff;
        --surface-2: #ebe8e1;
        --surface-3: #ddd9d0;
        --border: #dcd7cd;
        --text: #1b1f24;
        --muted: #56616d;
        --dim: #8b949e;
        --accent: #f2b84b;
        --accent-text: #8a5a08;
        --accent-ink: #2a1f00;
        --bad: #b42318;
        --bar: #93a1af;
        --bar-tail: #cfd5db;
    }
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    overscroll-behavior: none;
    overflow: hidden;
}

button, input, select {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    touch-action: manipulation;
}

code, kbd {
    font-family: var(--mono);
    font-size: 0.92em;
}

svg {
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
}

[hidden] {
    display: none !important;
}

/* ── layout ─────────────────────────────────────────────────────────────── */

.app {
    display: flex;
    flex-direction: column;
    height: 100%;
    height: 100dvh;
    max-width: 520px;
    margin: 0 auto;
    padding-top: env(safe-area-inset-top);
}

.bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 8px 0 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--muted);
}

.brand svg {
    width: 22px;
    height: 13px;
    color: var(--accent-text);
}

.bar nav {
    display: flex;
}

.icon {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border: 0;
    border-radius: 12px;
    background: none;
    color: var(--muted);
}

.icon svg {
    width: 22px;
    height: 22px;
}

.icon:active {
    background: var(--surface-2);
}

.screen {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    padding: 0 16px;
}

/* ── entry ──────────────────────────────────────────────────────────────── */

.entry {
    display: flex;
    align-items: center;
    gap: 4px;
    border-bottom: 1px solid var(--border);
}

#expr {
    flex: 1;
    min-width: 0;
    padding: 12px 0 10px;
    border: 0;
    background: none;
    font-family: var(--mono);
    font-size: 1.35rem;
    letter-spacing: -0.01em;
    caret-color: var(--accent-text);
    outline: none;
}

#expr::placeholder {
    color: var(--dim);
}

#kbd[aria-pressed="true"] {
    color: var(--accent-text);
    background: var(--surface-2);
}

.status {
    min-height: 1.5em;
    padding: 4px 0 0;
    font-size: 0.85rem;
    color: var(--dim);
}

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

/* ── results ────────────────────────────────────────────────────────────── */

.results {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding-bottom: 12px;
}

.output.stale {
    opacity: 0.45;
    transition: opacity 0.2s;
}

.summary {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
}

.headline {
    display: flex;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0 10px;
    min-width: 0;
}

.headline .value {
    font-size: clamp(2rem, 10vw, 2.6rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
    overflow-wrap: anywhere;
}

.headline .label {
    font-size: 0.85rem;
    color: var(--muted);
}

.spark {
    flex: none;
    width: 96px;
    height: 40px;
    margin-bottom: 6px;
    padding: 4px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
}

.spark svg {
    display: block;
    width: 100%;
    height: 100%;
    stroke: none;
}

.spark rect {
    fill: var(--bar);
}

.spark rect.median {
    fill: var(--accent);
}

.ranges {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 2px 12px;
    margin-top: 4px;
    font-variant-numeric: tabular-nums;
}

.ranges dt {
    color: var(--muted);
    font-size: 0.85rem;
    align-self: center;
}

.ranges dd {
    font-weight: 600;
}

.details {
    margin-top: 14px;
}

.chips {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: none;
}

.chips span {
    flex: none;
    padding: 5px 9px;
    border-radius: 999px;
    background: var(--surface);
    border: 1px solid var(--border);
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.chips b {
    color: var(--muted);
    font-weight: 500;
    margin-right: 4px;
}

.paths {
    margin-top: 10px;
    font-size: 0.85rem;
    color: var(--muted);
}

.paths strong {
    color: var(--accent-text);
    font-weight: 600;
}

/* histogram */

.hist {
    margin-top: 12px;
    display: grid;
    gap: 1px;
}

.row {
    display: grid;
    grid-template-columns: var(--label-width, 10ch) 1fr;
    align-items: center;
    gap: 10px;
    width: 100%;
    min-height: 24px;
    padding: 1px 6px 1px 0;
    border: 0;
    border-radius: 6px;
    background: none;
    text-align: left;
}

.row .lbl {
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--muted);
    text-align: right;
    white-space: nowrap;
}

.row .track {
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
    height: 16px;
}

.row .fill {
    flex: none;
    height: 100%;
    max-width: calc(100% - 4.5rem);
    border-radius: 3px;
    background: var(--bar);
}

.row.tail .fill {
    background: var(--bar-tail);
}

.row.tail .lbl,
.row.gap .lbl {
    color: var(--dim);
}

.row.has-median .fill {
    background: var(--accent);
}

.row .mark {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--accent-text);
    white-space: nowrap;
}

.row.selected {
    background: var(--surface-2);
}

.row-detail {
    min-height: 2.8em;
    margin-top: 8px;
    font-size: 0.85rem;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
}

.row-detail strong {
    color: var(--text);
}

.row-detail.open {
    min-height: 0;
    margin: 2px 0 6px;
    padding: 8px 12px;
    border-radius: 8px;
    background: var(--surface-2);
    color: var(--text);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 6px;
}

.pill {
    padding: 9px 14px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--surface);
    font-size: 0.88rem;
}

.pill:active {
    background: var(--surface-2);
}

.only-expanded {
    display: none;
}

/* intro */

.intro {
    padding-top: 14px;
    color: var(--muted);
    line-height: 1.5;
}

.intro .try {
    margin-top: 14px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--dim);
}

.examples {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.examples button {
    padding: 7px 11px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface);
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--text);
}

/* ── keypad ─────────────────────────────────────────────────────────────── */

.keypad {
    flex: none;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
    padding: 8px 10px calc(10px + env(safe-area-inset-bottom));
    border-top: 1px solid var(--border);
    background: var(--bg);
    user-select: none;
    -webkit-user-select: none;
}

.key {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1px;
    height: clamp(42px, 7.4dvh, 60px);
    border: 0;
    border-radius: 12px;
    background: var(--surface-2);
    font-size: 1.35rem;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    transition: background 0.08s, transform 0.08s;
}

.key.pressed {
    background: var(--surface-3);
    transform: scale(0.96);
}

.key.op,
.key.fn {
    background: var(--surface);
    color: var(--muted);
}

.key.op {
    color: var(--text);
}

.key.unit {
    background: var(--surface);
    color: var(--muted);
    font-size: 1.1rem;
}

.key[data-key="now"],
.key[data-key="ampm"] {
    font-size: 0.9rem;
}

.key.dist {
    background: var(--surface);
    color: var(--accent-text);
    font-family: var(--mono);
    font-size: 1rem;
    font-weight: 600;
    box-shadow: inset 0 0 0 1px var(--border);
}

.key.dist svg {
    width: 24px;
    height: 12px;
    opacity: 0.85;
}

.key.eq {
    background: var(--accent);
    color: var(--accent-ink);
    font-weight: 700;
}

.key .hint {
    position: absolute;
    top: 4px;
    right: 7px;
    font-size: 0.62rem;
    color: var(--dim);
}

.key.denied {
    animation: shake 0.18s;
}

@keyframes shake {
    25% { transform: translateX(-3px); }
    75% { transform: translateX(3px); }
}

/* After "=", a phone gives the whole screen to the result; tapping the
   expression (or Edit) brings the keypad back. */
@media (max-width: 759px) {
    .expanded .keypad {
        display: none;
    }

    .expanded .only-expanded {
        display: inline-block;
    }

    .expanded .results {
        padding-bottom: calc(16px + env(safe-area-inset-bottom));
    }
}

/* Wide screens and landscape phones: keypad beside the result. */
@media (min-width: 760px), (orientation: landscape) and (max-height: 540px) {
    .app {
        display: grid;
        grid-template-columns: minmax(0, 1fr) minmax(300px, 380px);
        grid-template-rows: auto minmax(0, 1fr);
        grid-template-areas: "bar bar" "screen keypad";
        max-width: 1040px;
        column-gap: 8px;
    }

    .bar { grid-area: bar; }
    .screen { grid-area: screen; }

    .keypad {
        grid-area: keypad;
        align-self: end;
        border-top: 0;
        padding-bottom: calc(16px + env(safe-area-inset-bottom));
    }
}

/* With a mouse, there's no thumb reach to optimise for. */
@media (min-width: 760px) and (pointer: fine) {
    .keypad {
        align-self: center;
    }
}

@media (orientation: landscape) and (max-height: 540px) {
    /* Side by side, so the keypad stays even after "=". */
    .expanded .keypad {
        display: grid;
    }

    .expanded .only-expanded {
        display: none;
    }

    .key {
        height: clamp(32px, 12.5dvh, 48px);
        font-size: 1.1rem;
    }

    .keypad {
        gap: 4px;
        padding-top: 0;
    }
}

/* ── sheets ─────────────────────────────────────────────────────────────── */

.sheet {
    margin: auto auto 0;
    width: 100%;
    max-width: 560px;
    max-height: 85dvh;
    border: 0;
    border-radius: 18px 18px 0 0;
    background: var(--surface);
    color: var(--text);
    padding: 0 18px calc(20px + env(safe-area-inset-bottom));
    overflow-y: auto;
    overscroll-behavior: contain;
    line-height: 1.5;
}

.sheet::backdrop {
    background: rgb(0 0 0 / 0.5);
}

@media (min-width: 760px) {
    .sheet {
        margin: auto;
        border-radius: 18px;
    }
}

.sheet > header {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0 6px;
    background: var(--surface);
}

.sheet h2 {
    font-size: 1.1rem;
}

.sheet h3 {
    margin: 18px 0 6px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

.sheet p + p {
    margin-top: 8px;
}

.sheet .examples button {
    background: var(--surface-2);
}

.muted {
    color: var(--muted);
}

.ops {
    border-collapse: collapse;
    width: 100%;
}

.ops td {
    padding: 6px 8px 6px 0;
    vertical-align: middle;
    border-top: 1px solid var(--border);
    font-size: 0.92rem;
}

.ops td:first-child svg {
    display: block;
    width: 28px;
    height: 16px;
    color: var(--accent-text);
}

.ops code {
    white-space: nowrap;
}

kbd {
    padding: 1px 6px;
    border: 1px solid var(--border);
    border-radius: 5px;
    background: var(--surface-2);
}

.credit {
    margin-top: 20px;
    font-size: 0.8rem;
    color: var(--dim);
}

.credit a {
    color: var(--muted);
}

/* history */

.history-list {
    list-style: none;
}

.history-list button {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    width: 100%;
    padding: 10px 0;
    border: 0;
    border-bottom: 1px solid var(--border);
    background: none;
    text-align: left;
}

.history-list .h-expr {
    font-family: var(--mono);
    font-size: 0.95rem;
    overflow-wrap: anywhere;
}

.history-list .h-result {
    flex: none;
    color: var(--muted);
    font-size: 0.85rem;
    font-variant-numeric: tabular-nums;
}

#history-clear {
    margin-top: 14px;
}

/* settings */

#settings-form {
    display: grid;
    gap: 16px;
    padding-top: 6px;
}

.seg {
    display: flex;
    gap: 0;
    border: 0;
}

.seg legend {
    margin-bottom: 6px;
    font-size: 0.85rem;
    color: var(--muted);
}

.seg label {
    flex: 1;
}

.seg input {
    position: absolute;
    opacity: 0;
}

.seg span {
    display: block;
    padding: 9px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    text-align: center;
}

.seg label:first-of-type span {
    border-radius: 10px 0 0 10px;
}

.seg label:last-of-type span {
    border-radius: 0 10px 10px 0;
}

.seg input:checked + span {
    background: var(--accent);
    color: var(--accent-ink);
    font-weight: 600;
}

.seg input:focus-visible + span {
    outline: 2px solid var(--accent-text);
}

.field {
    display: grid;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--muted);
}

.field select {
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--surface-2);
    font-size: 1rem;
}

.check {
    display: flex;
    align-items: center;
    gap: 10px;
}

.check input {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
}

/* toast */

.toast {
    position: fixed;
    left: 50%;
    bottom: calc(24px + env(safe-area-inset-bottom));
    transform: translate(-50%, 20px);
    padding: 10px 16px;
    border-radius: 999px;
    background: var(--text);
    color: var(--bg);
    font-size: 0.9rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
}

.toast.show {
    opacity: 1;
    transform: translate(-50%, 0);
}

/* With the system keyboard up, a phone has no room for ours too. */
@media (max-width: 759px) {
    .syskbd .keypad {
        display: none;
    }
}