/*
 * Layout: one 1280 x 720 stage, scaled to fit the window by deck.js. Each slide
 * is a label, a title, an optional one-line lead, then content. Demo canvases
 * stay dark in both themes, like the sky they show.
 */
:root {
    /* one neutral dark look, by choice: the deck is shown on a projector or a laptop */
    --bg: #161616;
    --ink: #ececec;
    --ink-2: #a6a6a6;
    --ink-3: #6e6e6e;
    --rule: #2b2b2b;
    --panel: #1e1e1e;
    --accent: #7fb6ff;
    --accent-ink: #101010;
    --accent-soft: #1f2836;

    /* names the demos read */
    --paper: var(--bg);
    --panel-2: #1b1b1b;
    --good-ink: #5fd6a0;
    --bad-ink: #ff8a94;
    --warn-ink: #ffc46b;

    --sky: #0c0c0c;
    --sky-2: #141414;
    --sky-line: rgba(255, 255, 255, 0.28);
    --sky-grid: rgba(255, 255, 255, 0.14);
    --sky-text: #d0d0d0;
    --star: #f4f1e7;
    --pred: #5ec8ff;
    --meas: #ffc857;
    --centroid: #4ade80;
    --resid: #ff7a59;
    --truth: #b49cff;
    --good: #3cd08f;
    --bad: #ff5c6c;
    --warn: #ffb347;
    --window: rgba(94, 200, 255, 0.55);
    --window-miss: rgba(255, 92, 108, 0.6);

    --font-ui: "Aspekta", system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-display: var(--font-ui);
    --font-body: var(--font-ui);
    --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-ui);
    -webkit-font-smoothing: antialiased;
    overflow: hidden;
}

/* ---------- Stage ---------- */

.deck {
    position: fixed;
    inset: 0;
    overflow: hidden;
}

.stage {
    position: absolute;
    left: 0;
    top: 0;
    width: 1280px;
    height: 720px;
    transform-origin: 0 0;
}

.slide {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    gap: 40px;
    padding: 56px 64px 48px;
    font-size: 22px;
    line-height: 1.45;
}

.slide > header {
    display: grid;
    gap: 8px;
}

.label {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--ink-3);
}

h1,
h2,
h3 {
    margin: 0;
    font-weight: 500;
    letter-spacing: -0.02em;
    text-wrap: balance;
}

h2 {
    font-size: 44px;
    line-height: 1.12;
}

.lead {
    margin: 0;
    font-size: 20px;
    color: var(--ink-2);
    max-width: 52em;
}

.body {
    flex: 1;
    min-height: 0;
    display: grid;
    align-content: start;
}

.page-no {
    position: absolute;
    right: 64px;
    bottom: 24px;
    font-size: 13px;
    color: var(--ink-3);
    font-variant-numeric: tabular-nums;
}

p {
    margin: 0;
}

.muted {
    color: var(--ink-3);
}

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

.num {
    font-variant-numeric: tabular-nums;
}

/* ---------- Title ---------- */

.title-slide {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 540px;
    gap: 40px;
    align-items: center;
}

.title-slide h1 {
    font-size: 132px;
    font-weight: 700;
    line-height: 0.9;
    letter-spacing: -0.045em;
}

.title-slide .subtitle {
    margin-top: 22px;
    font-size: 30px;
    line-height: 1.2;
    color: var(--ink-2);
    white-space: nowrap;
}

.title-slide .byline {
    margin-top: 44px;
    font-size: 17px;
    color: var(--ink-3);
}

.sky-figure {
    display: grid;
    gap: 10px;
    margin: 0;
}

.sky-figure figcaption {
    font-size: 13px;
    color: var(--ink-3);
}

/* ---------- Text layouts ---------- */

.list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 16px;
    font-size: 24px;
    line-height: 1.35;
    max-width: 1020px;
}

.list li {
    padding-left: 28px;
    position: relative;
}

.list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.66em;
    width: 14px;
    height: 2px;
    background: var(--ink-3);
}

.list .muted {
    display: block;
    font-size: 17px;
    margin-top: 2px;
}

.two-col {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
}

.pairs {
    display: grid;
    grid-template-columns: 300px minmax(0, 1fr);
    border-top: 1px solid var(--rule);
    font-size: 22px;
    line-height: 1.4;
}

.pairs > div {
    padding: 18px 0;
    border-bottom: 1px solid var(--rule);
}

.pairs .k {
    font-weight: 500;
}

.pairs .v {
    color: var(--ink-2);
}

.pairs .v b {
    color: var(--ink);
    font-weight: 500;
}

.pairs-head {
    font-size: 13px;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--ink-3);
    padding-bottom: 10px !important;
}

/* key figure on the horizon slide */
.figure-num {
    display: grid;
    gap: 6px;
    align-content: start;
}

.figure-num .big {
    font-size: 84px;
    font-weight: 500;
    letter-spacing: -0.04em;
    line-height: 1;
}

.figure-num .what {
    font-size: 18px;
    color: var(--ink-2);
    max-width: 16em;
}

/* ---------- Pipeline ---------- */

.pipe {
    display: grid;
    grid-template-columns: 1fr 24px 1fr 24px 1fr 24px 1fr 24px 1fr 24px 1fr;
    align-items: stretch;
    gap: 10px;
}

.pipe-node {
    border-top: 2px solid var(--ink);
    padding-top: 14px;
    display: grid;
    gap: 8px;
    align-content: start;
}

.pipe-node.io {
    border-top-color: var(--ink-3);
}

.pipe-node .n {
    font-size: 13px;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--ink-3);
}

.pipe-node h3 {
    font-size: 26px;
}

.pipe-node p {
    font-size: 16px;
    line-height: 1.45;
    color: var(--ink-2);
}

.pipe-arrow {
    align-self: start;
    padding-top: 18px;
    color: var(--ink-3);
    font-size: 20px;
    text-align: center;
}

.params {
    margin-top: 44px;
    display: grid;
    grid-template-columns: repeat(5, auto);
    justify-content: start;
    column-gap: 40px;
    row-gap: 6px;
    font-size: 16px;
    color: var(--ink-2);
}

.params b {
    color: var(--ink);
    font-weight: 500;
}

/* ---------- Results ---------- */

.stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 48px;
}

.stat {
    display: grid;
    gap: 10px;
    align-content: start;
    border-top: 1px solid var(--rule);
    padding-top: 22px;
}

.stat .big {
    font-size: 76px;
    font-weight: 500;
    letter-spacing: -0.045em;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.stat .big small {
    font-size: 36px;
    letter-spacing: -0.01em;
    margin-left: 6px;
    color: var(--ink-3);
}

.stat.key .big {
    color: var(--accent);
}

.stat .what {
    font-size: 20px;
    color: var(--ink-2);
}

.footnote {
    margin-top: 48px;
    font-size: 17px;
    color: var(--ink-3);
    max-width: 48em;
}

table.plain {
    border-collapse: collapse;
    font-size: 16px;
    font-variant-numeric: tabular-nums;
}

table.plain th,
table.plain td {
    text-align: right;
    padding: 7px 0 7px 36px;
    border-bottom: 1px solid var(--rule);
    white-space: nowrap;
}

table.plain th:first-child,
table.plain td:first-child {
    text-align: left;
    padding-left: 0;
}

table.plain thead th {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-3);
}

/* ---------- End ---------- */

.end-slide {
    justify-content: center;
}

.end-slide h2 {
    font-size: 96px;
    font-weight: 500;
    letter-spacing: -0.04em;
}

.end-slide .link {
    font-size: 24px;
    color: var(--ink-2);
}

a {
    color: inherit;
    text-decoration-color: var(--ink-3);
    text-underline-offset: 3px;
}

/* ---------- Notes (overlay and handout) ---------- */

.notes {
    display: none;
}

.notes-overlay {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    max-height: 38vh;
    overflow-y: auto;
    padding: 16px max(20px, env(safe-area-inset-right, 0px)) calc(16px + env(safe-area-inset-bottom, 0px)) max(20px, env(safe-area-inset-left, 0px));
    background: var(--panel);
    border-top: 1px solid var(--rule);
    font-size: 16px;
    line-height: 1.5;
    color: var(--ink);
    z-index: 5;
}

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

.blank {
    position: fixed;
    inset: 0;
    background: #000;
    z-index: 10;
}

.help {
    position: fixed;
    right: max(16px, env(safe-area-inset-right, 0px));
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    z-index: 6;
    padding: 14px 18px;
    background: var(--panel);
    border: 1px solid var(--rule);
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--ink-2);
}

.help kbd {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--ink);
    display: inline-block;
    min-width: 3.2em;
}

.nav {
    position: fixed;
    right: max(12px, env(safe-area-inset-right, 0px));
    bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    display: flex;
    gap: 4px;
    z-index: 4;
    opacity: 0;
    transition: opacity 0.2s;
}

.deck:hover ~ .nav,
.nav:hover,
.nav:focus-within {
    opacity: 1;
}

@media (hover: none) {
    .nav {
        opacity: 1;
    }
}

.nav button {
    font: inherit;
    font-size: 15px;
    width: 34px;
    height: 34px;
    border: 1px solid var(--rule);
    border-radius: 6px;
    background: var(--panel);
    color: var(--ink-2);
    cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* ---------- Demos inside slides ---------- */

.demo {
    margin: 0;
    min-height: 0;
}

.demo-head,
.demo-note,
.demo-hover {
    display: none;
}

.demo-body {
    display: grid;
    gap: 28px;
}

.demo-split {
    grid-template-columns: var(--stage-w, 620px) minmax(0, 1fr);
    align-items: start;
}

.demo-stack {
    grid-template-columns: minmax(0, 1fr);
}

.demo-stage,
.demo-side {
    min-width: 0;
    display: grid;
    gap: 12px;
    align-content: start;
}

.demo-full {
    display: none;
}

.canvas-wrap {
    position: relative;
    width: 100%;
    max-width: 100%;
    border-radius: 4px;
    overflow: hidden;
    background: var(--sky);
}

.canvas-wrap canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    touch-action: none;
}

.demo-hover {
    font-size: 14px;
    line-height: 1.45;
    color: var(--ink-3);
    margin: 0;
}

.chart-block {
    display: grid;
    gap: 6px;
    min-width: 0;
}

.chart-pair {
    display: grid;
    gap: 12px;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.panel-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--ink-2);
}

.panel-grid {
    display: grid;
    gap: 14px;
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.panel-cell {
    display: grid;
    gap: 6px;
    min-width: 0;
}

.panel-cell canvas {
    cursor: crosshair;
}

.demo-split-inner {
    display: grid;
    gap: 28px;
    grid-template-columns: 300px minmax(0, 1fr);
}

.controls {
    display: grid;
    gap: 12px;
    font-size: 14px;
}

.ctl {
    display: grid;
    gap: 5px;
    min-width: 0;
}

.ctl-heading {
    font-size: 12px;
    letter-spacing: 0.09em;
    text-transform: uppercase;
    color: var(--ink-3);
    margin-top: 4px;
}

.ctl-top {
    display: flex;
    justify-content: space-between;
    gap: 8px;
}

.ctl-label {
    color: var(--ink-2);
}

.ctl-value {
    font-size: 14px;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

input[type="range"] {
    width: 100%;
    accent-color: var(--accent);
    margin: 0;
}

select {
    font: inherit;
    padding: 5px 8px;
    border: 1px solid var(--rule);
    border-radius: 5px;
    background: var(--panel);
    color: var(--ink);
    max-width: 100%;
}

.ctl-check {
    display: flex;
    gap: 8px;
    align-items: center;
    color: var(--ink-2);
    cursor: pointer;
}

.ctl-check input {
    accent-color: var(--accent);
    margin: 0;
}

.seg,
.chips,
.btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.btn-row {
    gap: 8px;
}

.seg-btn,
.chip {
    font: inherit;
    font-size: 13px;
    line-height: 1.25;
    padding: 6px 10px;
    border: 1px solid var(--rule);
    border-radius: 5px;
    background: var(--panel);
    color: var(--ink-2);
    cursor: pointer;
}

.chip {
    min-width: 36px;
    text-align: center;
    padding: 5px 7px;
}

.seg-btn:hover,
.chip:hover {
    border-color: var(--ink-3);
    color: var(--ink);
}

.seg-btn[aria-checked="true"],
.chip[aria-pressed="true"] {
    background: var(--ink);
    border-color: var(--ink);
    color: var(--bg);
}

.btn {
    font: inherit;
    font-size: 14px;
    font-weight: 500;
    padding: 7px 14px;
    border-radius: 5px;
    border: 1px solid var(--ink-3);
    background: transparent;
    color: var(--ink);
    cursor: pointer;
    justify-self: start;
}

.btn:hover {
    border-color: var(--ink);
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-ink);
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.readout {
    font-size: 14px;
    display: grid;
    border-top: 1px solid var(--rule);
}

.ro-row {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 5px 0;
    border-bottom: 1px solid var(--rule);
}

.ro-k {
    color: var(--ink-2);
    min-width: 0;
}

.ro-v {
    text-align: right;
    font-variant-numeric: tabular-nums;
    color: var(--ink);
}

.ro-row.good .ro-v {
    color: var(--good-ink);
    font-weight: 500;
}

.ro-row.bad .ro-v {
    color: var(--bad-ink);
    font-weight: 500;
}

.side-note {
    font-size: 14px;
    line-height: 1.5;
    color: var(--ink-2);
}

.side-note p {
    margin: 0 0 6px;
}

.outcomes {
    display: grid;
    gap: 3px;
    font-size: 14px;
}

.outcome {
    display: flex;
    gap: 8px;
    align-items: baseline;
    color: var(--ink-2);
}

.outcome-icon {
    font-family: var(--font-mono);
    width: 16px;
    text-align: center;
    font-weight: 700;
}

.outcome-right .outcome-icon {
    color: var(--good-ink);
}

.outcome-wrong .outcome-icon {
    color: var(--bad-ink);
}

.outcome-dropped .outcome-icon {
    color: var(--warn-ink);
}

.iter-table {
    overflow-x: auto;
    min-width: 0;
}

.iter-table table {
    border-collapse: collapse;
    font-size: 13px;
    font-variant-numeric: tabular-nums;
}

.iter-table td,
.iter-table th {
    padding: 4px 10px 4px 0;
    white-space: nowrap;
    text-align: right;
    border-bottom: 1px solid var(--rule);
}

.iter-table p {
    font-size: 13px;
    margin: 6px 0 0;
}

/* ---------- Per-demo fitting ---------- */

#demo-distortion {
    --stage-w: 820px;
}

#demo-distortion .demo-stage {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    column-gap: 20px;
}

.ctl:has(#demo-distortion-k3),
.ctl:has(#demo-distortion-p1),
.ctl:has(#demo-distortion-p2),
.ctl:has(#demo-distortion-dy),
.ctl:has(#demo-distortion-alpha),
.ctl:has(#demo-distortion-up),
.ctl:has(#demo-distortion-vp) {
    display: none;
}

#demo-dark .inspector {
    max-width: 440px;
    display: grid;
    gap: 6px;
}

#demo-sky {
    --stage-w: 530px;
}

#demo-centroid {
    --stage-w: 390px;
}

#demo-centroid .demo-side {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 28px;
}

#demo-centroid .demo-side > .controls {
    grid-row: span 3;
}

#demo-fit {
    --stage-w: 660px;
}

#demo-fit .demo-side {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 24px;
}

#demo-fit .demo-side > .controls {
    grid-column: 1;
    grid-row: 1 / span 2;
}

#demo-fit .demo-side > .btn-row,
#demo-fit .demo-side > .readout {
    grid-column: 2;
}

#demo-fit .readout {
    font-size: 13px;
}

#demo-fit .demo-stage {
    grid-template-columns: minmax(0, 1fr) 200px;
    column-gap: 16px;
}

#demo-fit .demo-stage > .canvas-wrap {
    grid-column: 1;
    grid-row: 1;
}

#demo-fit .demo-stage > .demo-hover {
    grid-column: 1;
    grid-row: 2;
}

#demo-fit .demo-stage > .chart-pair {
    grid-column: 2;
    grid-row: 1 / span 2;
    grid-template-columns: minmax(0, 1fr);
    align-content: start;
}

#demo-fit .ctl:has(#demo-fit-camera-0),
#demo-fit .ctl:has(#demo-fit-attitudeNoise),
#demo-fit .ctl:has(#demo-fit-misalignment),
#demo-fit .ctl:has(#demo-fit-magnitudeLimit),
#demo-fit .ctl:has(.chips) {
    display: none;
}

#demo-fingerprints {
    --stage-w: 520px;
}

#demo-lm {
    --stage-w: 560px;
}

#demo-crowded {
    --stage-w: 560px;
}

#s7 .body {
    padding-top: 24px;
}

.pipe-list {
    margin-top: 64px;
}

.stats-list {
    margin-top: 40px;
}

/* ---------- Points above a demo ---------- */

.slide:has(.points) {
    gap: 24px;
}

.points {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 32px;
    font-size: 17px;
    line-height: 1.4;
    color: var(--ink);
}

.points li {
    padding-left: 20px;
    position: relative;
}

.points li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.7em;
    width: 10px;
    height: 2px;
    background: var(--ink-3);
}

.b4-cols {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 72px;
}

.status-cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 48px;
    align-content: start;
}

.status-cols h3 {
    font-size: 26px;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--rule);
}

.status-cols .list {
    font-size: 21px;
}

.status-two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 64px;
}