/* OpenFPL Scout AI — technical report
   Dark-only, matching the host application (the app ships no light theme).
   Data-mark palette is validated for CVD separation and contrast on --panel. */

:root {
    /* Surfaces */
    --bg: #12061a;
    --panel: #1c0828;
    --panel-2: #250f33;
    --line: rgba(255, 255, 255, 0.10);
    --line-strong: rgba(255, 255, 255, 0.18);

    /* Ink */
    --ink: #f8f7fb;
    --ink-2: #c5b9cf;
    --ink-3: #91849e;

    /* Brand chrome — never used to encode data */
    --lime: #c8ff32;
    --aqua: #39f1ff;
    --pink: #ff4fa7;

    /* Validated categorical data palette (dark, surface #1c0828)
       Lightness band PASS · Chroma floor PASS · CVD separation PASS (ΔE 17.3)
       Normal-vision floor PASS (ΔE 17.9) · Contrast vs surface PASS (all >= 3:1) */
    --s1: #729e00;
    --s2: #00a8b3;
    --s3: #9a6500;
    --s4: #743bfe;
    --s5: #ca027b;
    --reference: #6f6478;

    /* Status — reserved meanings, always shipped with a label */
    --good: #3f9d5a;
    --warn: #a97800;
    --bad: #c0392b;

    --font-body: Inter, Aptos, "Segoe UI", Helvetica, Arial, sans-serif;
    --font-display: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

    --radius: 16px;
    --maxw: 1140px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ---------- Layout ---------- */

.wrap {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
}

main section {
    padding: 56px 0 8px;
    border-top: 1px solid var(--line);
}

main section:first-of-type {
    border-top: 0;
}

/* ---------- Masthead ---------- */

.masthead {
    padding: 64px 0 40px;
    background:
        radial-gradient(900px 420px at 12% -10%, rgba(200, 255, 50, 0.10), transparent 60%),
        radial-gradient(700px 380px at 88% 0%, rgba(57, 241, 255, 0.09), transparent 60%);
}

.eyebrow {
    font-size: 12px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--lime);
    font-weight: 600;
    margin: 0 0 14px;
}

.masthead h1 {
    font-family: var(--font-display);
    font-size: clamp(38px, 7vw, 74px);
    line-height: 0.98;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    margin: 0 0 18px;
}

.masthead .lede {
    font-size: clamp(16px, 2.1vw, 19px);
    color: var(--ink-2);
    max-width: 68ch;
    margin: 0 0 26px;
}

.meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 10px;
    margin-top: 8px;
}

.chip {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 5px 12px;
    border: 1px solid var(--line-strong);
    border-radius: 999px;
    font-size: 12.5px;
    color: var(--ink-2);
    background: rgba(255, 255, 255, 0.03);
    white-space: nowrap;
}

.chip b {
    color: var(--ink);
    font-weight: 600;
}

/* ---------- Table of contents ---------- */

.toc {
    margin: 34px 0 0;
    padding: 20px 22px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.toc h2 {
    font-size: 12px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-3);
    margin: 0 0 12px;
    font-weight: 600;
}

.toc ol {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 4px 24px;
    counter-reset: toc;
}

.toc li {
    counter-increment: toc;
}

.toc a {
    display: block;
    padding: 5px 0;
    color: var(--ink-2);
    text-decoration: none;
    font-size: 14.5px;
    border-bottom: 1px solid transparent;
}

.toc a::before {
    content: counter(toc, decimal-leading-zero);
    color: var(--ink-3);
    font-family: var(--font-mono);
    font-size: 11.5px;
    margin-right: 10px;
}

.toc a:hover {
    color: var(--lime);
}

/* ---------- Headings ---------- */

h2.sec {
    font-size: clamp(24px, 3.4vw, 32px);
    line-height: 1.15;
    margin: 0 0 6px;
    letter-spacing: -0.015em;
}

.sec-num {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--lime);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 10px;
}

h3 {
    font-size: 18px;
    margin: 30px 0 8px;
    letter-spacing: -0.01em;
}

h4 {
    font-size: 15px;
    margin: 22px 0 6px;
    color: var(--ink);
}

p {
    margin: 0 0 14px;
    max-width: 76ch;
    color: var(--ink-2);
}

p.intro {
    font-size: 17px;
    color: var(--ink-2);
    margin-bottom: 22px;
}

ul,
ol.body-list {
    margin: 0 0 16px;
    padding-left: 20px;
    max-width: 76ch;
    color: var(--ink-2);
}

li {
    margin-bottom: 7px;
}

strong {
    color: var(--ink);
    font-weight: 600;
}

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

code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid var(--line);
    padding: 1px 6px;
    border-radius: 6px;
    color: var(--ink);
    word-break: break-word;
}

pre {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 16px 18px;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--ink-2);
    margin: 0 0 18px;
}

pre code {
    background: none;
    border: 0;
    padding: 0;
    font-size: inherit;
}

/* ---------- Stat tiles ---------- */

.tiles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 12px;
    margin: 24px 0 8px;
}

.tile {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px 18px 16px;
}

.tile .k {
    font-size: 11.5px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-3);
    margin-bottom: 8px;
    font-weight: 600;
}

.tile .v {
    font-size: 31px;
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.tile .s {
    font-size: 12.5px;
    color: var(--ink-3);
    margin-top: 6px;
    line-height: 1.45;
}

/* ---------- Figures ---------- */

figure {
    margin: 26px 0 30px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px 22px 18px;
}

figcaption {
    font-size: 13px;
    color: var(--ink-3);
    margin-top: 14px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
    line-height: 1.55;
    max-width: 90ch;
}

figcaption b {
    color: var(--ink-2);
    font-weight: 600;
}

.fig-head {
    margin-bottom: 16px;
}

.fig-title {
    font-size: 16px;
    font-weight: 650;
    letter-spacing: -0.01em;
    margin: 0 0 3px;
}

.fig-sub {
    font-size: 13px;
    color: var(--ink-3);
    margin: 0;
    max-width: 80ch;
}

.chart-scroll {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
}

.chart-scroll svg {
    display: block;
    max-width: 100%;
    height: auto;
}

.chart-scroll.fixed-min svg {
    min-width: 620px;
    max-width: none;
    width: 100%;
}

/* ---------- Legend ---------- */

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    margin: 0 0 14px;
    font-size: 13px;
    color: var(--ink-2);
}

.legend span {
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.legend i {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    flex: none;
    display: inline-block;
}

.legend i.dash {
    height: 0;
    width: 16px;
    border-radius: 0;
    border-top: 2px dashed var(--reference);
}

/* ---------- SVG primitives ---------- */

.grid-line {
    stroke: rgba(255, 255, 255, 0.07);
    stroke-width: 1;
}

.axis-line {
    stroke: rgba(255, 255, 255, 0.16);
    stroke-width: 1;
}

.tick {
    fill: var(--ink-3);
    font-size: 11px;
    font-family: var(--font-body);
}

.tick-strong {
    fill: var(--ink-2);
    font-size: 12px;
    font-family: var(--font-body);
}

.axis-title {
    fill: var(--ink-3);
    font-size: 11.5px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-family: var(--font-body);
}

.val-label {
    fill: var(--ink);
    font-size: 12px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    font-family: var(--font-body);
}

/* fill/pointer-events come from presentation attributes set in charts.js so
   that non-browser renderers do not fall back to SVG's default black fill. */
.hit {
    cursor: pointer;
}

/* ---------- Tooltip ---------- */

.tip {
    position: fixed;
    z-index: 60;
    pointer-events: none;
    background: #0b0410;
    border: 1px solid var(--line-strong);
    border-radius: 10px;
    padding: 9px 12px;
    font-size: 12.5px;
    line-height: 1.5;
    color: var(--ink-2);
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.6);
    opacity: 0;
    transition: opacity 120ms ease;
    max-width: 260px;
}

.tip.on {
    opacity: 1;
}

.tip b {
    color: var(--ink);
    display: block;
    margin-bottom: 3px;
    font-size: 13px;
}

.tip .row {
    display: flex;
    align-items: center;
    gap: 7px;
    font-variant-numeric: tabular-nums;
}

.tip .row i {
    width: 9px;
    height: 9px;
    border-radius: 2px;
    flex: none;
}

/* ---------- Tables ---------- */

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--line);
    border-radius: 12px;
    margin: 0 0 20px;
    background: var(--panel);
}

table {
    border-collapse: collapse;
    width: 100%;
    font-size: 13.5px;
    min-width: 520px;
}

th,
td {
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid var(--line);
    white-space: nowrap;
}

th {
    font-size: 11.5px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-3);
    font-weight: 600;
    background: rgba(255, 255, 255, 0.03);
}

td {
    color: var(--ink-2);
}

td.num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

th.num {
    text-align: right;
}

tbody tr:last-child td {
    border-bottom: 0;
}

tbody tr.best td {
    color: var(--ink);
    background: rgba(200, 255, 50, 0.05);
}

td.name {
    color: var(--ink);
}

details.data-table {
    margin: -8px 0 26px;
}

details.data-table summary {
    cursor: pointer;
    font-size: 13px;
    color: var(--ink-3);
    padding: 6px 0;
    list-style: none;
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

details.data-table summary::-webkit-details-marker {
    display: none;
}

details.data-table summary::before {
    content: "▸";
    font-size: 10px;
    transition: transform 150ms ease;
    display: inline-block;
}

details.data-table[open] summary::before {
    transform: rotate(90deg);
}

details.data-table summary:hover {
    color: var(--lime);
}

details.data-table .table-wrap {
    margin-top: 10px;
}

/* ---------- Callouts ---------- */

.note {
    border-left: 3px solid var(--line-strong);
    background: var(--panel);
    border-radius: 0 12px 12px 0;
    padding: 15px 18px;
    margin: 0 0 20px;
    font-size: 14.5px;
    color: var(--ink-2);
    max-width: 82ch;
}

.note p:last-child {
    margin-bottom: 0;
}

.note .label {
    display: block;
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 700;
    margin-bottom: 6px;
}

.note.caveat {
    border-left-color: var(--warn);
}

.note.caveat .label {
    color: var(--warn);
}

.note.key {
    border-left-color: var(--lime);
}

.note.key .label {
    color: var(--lime);
}

.note.limit {
    border-left-color: var(--bad);
}

.note.limit .label {
    color: var(--bad);
}

/* ---------- Two-column ---------- */

.cols {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 12px 26px;
    margin-bottom: 8px;
}

.cols > div {
    min-width: 0;
}

.card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px 20px;
}

.card h4 {
    margin-top: 0;
}

.card p:last-child,
.card ul:last-child {
    margin-bottom: 0;
}

/* ---------- Diagram ---------- */

.diagram {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 20px;
    margin: 24px 0 8px;
}

.diagram svg {
    display: block;
    width: 100%;
    height: auto;
}

.dg-box {
    fill: var(--panel-2);
    stroke: var(--line-strong);
    stroke-width: 1;
}

.dg-box.accent {
    stroke: rgba(200, 255, 50, 0.45);
    fill: rgba(200, 255, 50, 0.07);
}

.dg-box.ext {
    stroke: rgba(57, 241, 255, 0.4);
    fill: rgba(57, 241, 255, 0.06);
}

.dg-t {
    fill: var(--ink);
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-body);
}

.dg-s {
    fill: var(--ink-3);
    font-size: 11px;
    font-family: var(--font-body);
}

.dg-arrow {
    stroke: var(--line-strong);
    stroke-width: 1.5;
    fill: none;
}

.dg-label {
    fill: var(--ink-3);
    font-size: 10.5px;
    font-family: var(--font-mono);
}

/* ---------- Footer ---------- */

footer {
    margin-top: 64px;
    border-top: 1px solid var(--line);
    padding: 32px 0 60px;
    font-size: 13.5px;
    color: var(--ink-3);
}

footer p {
    color: var(--ink-3);
    font-size: 13.5px;
}

footer a {
    color: var(--ink-2);
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
    .wrap {
        padding: 0 18px;
    }

    figure {
        padding: 16px 14px 14px;
    }

    .tile .v {
        font-size: 27px;
    }

    main section {
        padding-top: 44px;
    }
}

/* Paged output is produced by scripts/build_report_pdf.py, which supplies its
   own complete print stylesheet. A partial @media print block here only fought
   it — flipping the page white while every chart and panel stayed dark. */
@media print {
    .tip {
        display: none;
    }
}