/* HybridCUA project page — no framework, no build step. */

/* ============================== tokens ============================== */

:root {
    color-scheme: light;

    --surface-1: #ffffff;
    --surface-2: #f6f6f4;
    --surface-3: #eeeeeb;
    --page: #fbfbfa;

    --text-primary: #12130f;
    --text-secondary: #4a4a45;
    --text-muted: #77766f;

    --border: #e2e2dc;
    --border-strong: #cfcfc7;

    /* categorical slots 1–3, validated light (all checks pass, --pairs all) */
    --series-1: #2a78d6;
    --series-2: #eb6834;
    --series-3: #1baf7a;

    /* semantic roles for the two interfaces */
    --cli: var(--series-1);
    --gui: #b4b1a8;
    --cli-soft: #d8e7fa;
    --gui-soft: #e8e7e1;

    /* ordinal blue pair (validated --ordinal) */
    --blue-light: #86b6ef;
    --blue-dark: #2a78d6;

    --good: #0b7d2f;
    --bad: #c0392f;

    --grid: #ebebe5;
    --axis: #cfcfc7;
    --accent: #2a78d6;
    --accent-ink: #1b5396;
    --highlight-row: #eaf2fd;

    --shadow-sm: 0 1px 2px rgba(18, 19, 15, .05);
    --shadow-md: 0 2px 14px rgba(18, 19, 15, .07);

    --radius: 10px;
    --radius-sm: 6px;

    --sans: system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
    --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

    --nav-h: 56px;
}

@media (prefers-color-scheme: dark) {
    :root:where(:not([data-theme="light"])) {
        color-scheme: dark;

        --surface-1: #17181b;
        --surface-2: #1d1e22;
        --surface-3: #24262a;
        --page: #101114;

        --text-primary: #f4f4f1;
        --text-secondary: #bdbcb4;
        --text-muted: #8d8c84;

        --border: #2d2f34;
        --border-strong: #3c3e44;

        --series-1: #3987e5;
        --series-2: #d95926;
        --series-3: #199e70;

        --cli: var(--series-1);
        --gui: #6e6c66;
        --cli-soft: #1e3a5c;
        --gui-soft: #32332f;

        --blue-light: #9ec5f4;
        --blue-dark: #3987e5;

        --good: #3fb765;
        --bad: #e2665b;

        --grid: #26282c;
        --axis: #3c3e44;
        --accent: #64a4f0;
        --accent-ink: #9cc6f6;
        --highlight-row: #1b2b40;

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
        --shadow-md: 0 2px 14px rgba(0, 0, 0, .35);
    }
}

:root[data-theme="dark"] {
    color-scheme: dark;

    --surface-1: #17181b;
    --surface-2: #1d1e22;
    --surface-3: #24262a;
    --page: #101114;

    --text-primary: #f4f4f1;
    --text-secondary: #bdbcb4;
    --text-muted: #8d8c84;

    --border: #2d2f34;
    --border-strong: #3c3e44;

    --series-1: #3987e5;
    --series-2: #d95926;
    --series-3: #199e70;

    --cli: var(--series-1);
    --gui: #6e6c66;
    --cli-soft: #1e3a5c;
    --gui-soft: #32332f;

    --blue-light: #9ec5f4;
    --blue-dark: #3987e5;

    --good: #3fb765;
    --bad: #e2665b;

    --grid: #26282c;
    --axis: #3c3e44;
    --accent: #64a4f0;
    --accent-ink: #9cc6f6;
    --highlight-row: #1b2b40;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
    --shadow-md: 0 2px 14px rgba(0, 0, 0, .35);
}

/* ============================== base ============================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--nav-h) + 16px);
    -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    * {
        transition: none !important;
        animation: none !important;
    }
}

body {
    margin: 0;
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.65;
    color: var(--text-primary);
    background: var(--page);
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
    line-height: 1.25;
    letter-spacing: -.012em;
    margin: 0;
    font-weight: 650;
}

a {
    color: var(--accent-ink);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

sup {
    font-size: .68em;
    line-height: 0;
    font-weight: 500;
}

code {
    font-family: var(--mono);
    font-size: .875em;
    background: var(--surface-3);
    padding: .1em .35em;
    border-radius: 4px;
    word-break: break-word;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 3px;
}

/* ============================== layout ============================== */

.wrap {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

.wrap-narrow {
    max-width: 760px;
}

.wrap-narrow-inner {
    max-width: 760px;
}

.section {
    padding: 60px 0;
    background: var(--page);
}

.section-alt {
    background: var(--surface-2);
    border-block: 1px solid var(--border);
}

.section>.wrap>h2 {
    font-size: 1.75rem;
    margin-bottom: 1.1rem;
}

h3.sub {
    font-size: 1.15rem;
    margin: 2.5rem 0 1rem;
    padding-top: 1.35rem;
    border-top: 1px solid var(--border);
}

.lede {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin: 0 0 2rem;
}

.note {
    font-size: .8125rem;
    color: var(--text-muted);
    margin: .75rem 0 0;
}

/* ============================== nav ============================== */

.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--nav-h);
    background: color-mix(in srgb, var(--surface-1) 88%, transparent);
    backdrop-filter: saturate(160%) blur(10px);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.0625rem;
    letter-spacing: -.02em;
    color: var(--text-primary);
    margin-right: auto;
}

.nav-brand:hover {
    text-decoration: none;
    color: var(--accent-ink);
}

.nav-links {
    display: flex;
    gap: 2px;
}

.nav-links a {
    padding: 6px 10px;
    font-size: .875rem;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
}

.nav-links a:hover {
    text-decoration: none;
    color: var(--text-primary);
    background: var(--surface-3);
}

.nav-links a.active {
    color: var(--accent-ink);
    background: var(--surface-3);
}

.theme-toggle,
.nav-toggle {
    display: grid;
    place-items: center;
    width: 34px;
    height: 34px;
    flex: 0 0 34px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface-1);
    color: var(--text-secondary);
    cursor: pointer;
}

.theme-toggle:hover,
.nav-toggle:hover {
    color: var(--text-primary);
    border-color: var(--border-strong);
}

.theme-toggle svg {
    width: 17px;
    height: 17px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.7;
}

.icon-moon {
    display: none;
}

:root[data-theme="dark"] .icon-sun,
.icon-moon {
    display: none;
}

:root[data-theme="dark"] .icon-moon {
    display: block;
}

@media (prefers-color-scheme: dark) {
    :root:where(:not([data-theme="light"])) .icon-sun {
        display: none;
    }

    :root:where(:not([data-theme="light"])) .icon-moon {
        display: block;
    }
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 3px;
}

.nav-toggle span {
    display: block;
    width: 15px;
    height: 1.6px;
    background: currentColor;
    border-radius: 2px;
}

/* ============================== hero ============================== */

.hero {
    padding: 56px 0 8px;
    background: var(--page);
    text-align: center;
}

.venue {
    margin: 0 0 14px;
    font-size: .75rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
}

.hero-title {
    font-size: clamp(1.5rem, 3.4vw, 2.45rem);
    letter-spacing: -.025em;
    margin: 0 auto 1.5rem;
}

/* Two deliberate lines; they only rewrap once the viewport is too narrow. */
.hero-title .line {
    display: block;
    text-wrap: balance;
}

@media (max-width: 560px) {
    .hero-title .line {
        display: inline;
    }
}

.authors {
    margin: 0 0 .5rem;
    font-size: 1rem;
    color: var(--text-primary);
    max-width: 780px;
    margin-inline: auto;
}

.author {
    white-space: nowrap;
}

.sep {
    margin-right: .3em;
}

.affil {
    margin: 0 0 2rem;
    font-size: .9375rem;
    color: var(--text-secondary);
}

.affil-note {
    display: block;
    margin-top: .3rem;
    font-size: .8125rem;
    color: var(--text-muted);
}

.links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 2.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 16px;
    font-size: .9375rem;
    font-weight: 550;
    color: var(--text-primary);
    background: var(--surface-1);
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    box-shadow: var(--shadow-sm);
    transition: transform .12s ease, box-shadow .12s ease;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.6;
    stroke-linejoin: round;
}

.btn-disabled {
    color: var(--text-muted);
    border-style: dashed;
    box-shadow: none;
    cursor: default;
}

.btn-disabled:hover {
    transform: none;
    box-shadow: none;
}

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

:root[data-theme="dark"] .btn-primary,
:root:where(:not([data-theme="light"])) .btn-primary {
    color: #0d1118;
}

@media (prefers-color-scheme: light) {
    :root:where(:not([data-theme="dark"])) .btn-primary {
        color: #fff;
    }
}

/* ---------- KPI row ---------- */

.kpis {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 1rem;
    text-align: left;
}

.kpi {
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: var(--shadow-sm);
}

.kpi-label {
    display: block;
    font-size: .75rem;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: 6px;
}

.kpi-value {
    display: flex;
    align-items: baseline;
    gap: 6px;
    font-size: 1.875rem;
    font-weight: 660;
    letter-spacing: -.03em;
    line-height: 1.1;
}

.kpi-unit {
    font-size: 1rem;
    font-weight: 550;
    color: var(--text-secondary);
}

.kpi-delta {
    font-size: .8125rem;
    font-weight: 600;
    color: var(--good);
}

.kpi-delta.down {
    color: var(--good);
}

.kpi-sub {
    display: block;
    font-size: .8125rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ============================== figures ============================== */

.fig {
    margin: 2rem 0;
}

.fig img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-1);
}

.fig-teaser {
    margin-top: 2.5rem;
    margin-bottom: 0;
}

figcaption {
    margin-top: .9rem;
    font-size: .875rem;
    line-height: 1.6;
    color: var(--text-secondary);
    text-align: left;
}

/* ============================== prose ============================== */

.prose p {
    margin: 0 0 1rem;
    color: var(--text-secondary);
}

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

.prose b {
    color: var(--text-primary);
    font-weight: 620;
}

.abstract p {
    font-size: 1.0625rem;
    line-height: 1.8;
    text-align: justify;
    hyphens: auto;
}

/* ============================== cards & grids ============================== */

.card {
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px 24px;
}

.chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-bottom: 1.5rem;
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: center;
    margin-top: 2.5rem;
}

.two-col-wide {
    grid-template-columns: 1.05fr 1fr;
    align-items: start;
    margin-top: 1.5rem;
}

.chart-head h3 {
    font-size: 1rem;
    margin: 0 0 .25rem;
}

.chart-head p {
    margin: 0;
    font-size: .8125rem;
    color: var(--text-muted);
}

.table-card .chart-head {
    margin-bottom: 14px;
}

/* ---------- reward cards ---------- */

.reward-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-top: 1.25rem;
}

.reward-card p {
    font-size: .9375rem;
    color: var(--text-secondary);
    margin: 0 0 .85rem;
}

.tag {
    display: inline-block;
    font-size: .6875rem;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    padding: 3px 9px;
    border-radius: 999px;
    margin-bottom: 14px;
}

.tag-task {
    color: var(--accent-ink);
    background: var(--cli-soft);
}

.tag-step {
    color: var(--text-primary);
    background: var(--gui-soft);
}

.eq {
    font-family: var(--mono);
    font-size: .9375rem !important;
    color: var(--text-primary) !important;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    overflow-x: auto;
}

.reward-card .meta {
    font-size: .8125rem !important;
    color: var(--text-muted) !important;
    margin-bottom: 0 !important;
    padding-top: .85rem;
    border-top: 1px solid var(--border);
}

/* ---------- route cards ---------- */

.route-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-top: 2rem;
}

.route-card p {
    margin: 10px 0 0;
    font-size: .875rem;
    color: var(--text-secondary);
}

.route-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: .6875rem;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.route-tag::before {
    content: "";
    width: 9px;
    height: 9px;
    border-radius: 2px;
    background: var(--gui);
}

.route-cli::before {
    background: var(--cli);
}

.route-hybrid::before {
    background: linear-gradient(135deg, var(--gui) 0 50%, var(--cli) 50% 100%);
}

/* ============================== code ============================== */

.code-pair {
    display: grid;
    gap: 12px;
}

.code-block {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--surface-1);
}

.code-label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    font-size: .75rem;
    font-weight: 650;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--text-secondary);
    background: var(--surface-2);
    border-bottom: 1px solid var(--border);
}

.dot {
    width: 9px;
    height: 9px;
    border-radius: 2px;
    background: var(--gui);
}

.dot-cli {
    background: var(--cli);
}

.code-note {
    margin: 0;
    font-size: .8125rem;
    color: var(--text-muted);
}

pre {
    margin: 0;
    overflow-x: auto;
}

.code-block pre,
pre.code {
    padding: 14px 16px;
    background: var(--surface-1);
    border-radius: var(--radius);
    font-size: .8125rem;
    line-height: 1.65;
    tab-size: 2;
}

pre.code {
    border: 1px solid var(--border);
    margin-bottom: 1.25rem;
}

pre code {
    background: none;
    padding: 0;
    font-family: var(--mono);
    color: var(--text-primary);
    white-space: pre;
}

pre .s {
    color: var(--series-3);
}

pre .c {
    color: var(--text-muted);
}

pre .v {
    color: var(--series-2);
}

/* ---------- bibtex ---------- */

.bibtex {
    position: relative;
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2;
    padding: 5px 12px;
    font-family: var(--sans);
    font-size: .75rem;
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--surface-2);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.copy-btn:hover {
    color: var(--text-primary);
    background: var(--surface-3);
}

/* ============================== tables ============================== */

.table-scroll {
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-1);
}

.table-card .table-scroll {
    border: 0;
    border-radius: 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: .875rem;
}

thead th {
    position: relative;
    padding: 11px 14px;
    text-align: right;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--text-muted);
    white-space: nowrap;
    background: var(--surface-2);
    border-bottom: 1px solid var(--border-strong);
}

thead th:first-child {
    text-align: left;
}

tbody td {
    padding: 9px 14px;
    text-align: right;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

tbody td:first-child {
    text-align: left;
    color: var(--text-primary);
    white-space: normal;
    min-width: 170px;
}

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

tbody tr:hover td {
    background: var(--surface-2);
}

tr.group-row td {
    padding: 9px 14px 6px;
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--text-muted);
    background: var(--surface-2);
}

tr.group-row:hover td {
    background: var(--surface-2);
}

tr.rule-above td {
    border-top: 1px solid var(--border-strong);
}

tr.hl td {
    background: var(--highlight-row);
    color: var(--text-primary);
    font-weight: 600;
}

tr.hl:hover td {
    background: var(--highlight-row);
}

td.indent {
    padding-left: 30px;
}

td .best {
    font-weight: 700;
    color: var(--text-primary);
}

.delta {
    display: inline-block;
    margin-left: 6px;
    font-size: .75rem;
    font-weight: 650;
    font-variant-numeric: tabular-nums;
}

.delta.up {
    color: var(--good);
}

.delta.dn {
    color: var(--bad);
}

.space-chip {
    display: inline-block;
    padding: 1px 8px;
    font-size: .75rem;
    font-weight: 600;
    border-radius: 999px;
    border: 1px solid var(--border-strong);
    color: var(--text-secondary);
    white-space: nowrap;
}

.space-chip.cli {
    color: var(--accent-ink);
    border-color: var(--cli);
    background: var(--cli-soft);
}

/* ============================== details ============================== */

.table-toggle,
.spec {
    margin: 1.25rem 0 0;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--surface-1);
}

.table-toggle summary,
.spec summary {
    cursor: pointer;
    padding: 12px 18px;
    font-size: .875rem;
    font-weight: 600;
    color: var(--text-secondary);
    list-style: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.table-toggle summary::-webkit-details-marker,
.spec summary::-webkit-details-marker {
    display: none;
}

.table-toggle summary::before,
.spec summary::before {
    content: "";
    width: 0;
    height: 0;
    border-left: 5px solid currentColor;
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    transition: transform .15s ease;
}

.table-toggle[open] summary::before,
.spec[open] summary::before {
    transform: rotate(90deg);
}

.table-toggle summary:hover,
.spec summary:hover {
    color: var(--text-primary);
}

.table-toggle[open] summary,
.spec[open] summary {
    border-bottom: 1px solid var(--border);
}

.table-toggle .table-scroll {
    border: 0;
    border-radius: 0;
}

.spec-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0 28px;
    padding: 14px 18px 18px;
}

.spec-block h4 {
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 14px 0 6px;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 4px 0;
    font-size: .8125rem;
    border-bottom: 1px solid var(--border);
}

.spec-row:last-child {
    border-bottom: 0;
}

.spec-row dt {
    color: var(--text-muted);
}

.spec-row dd {
    margin: 0;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    text-align: right;
}

/* ============================== step-by-step cases ============================== */

.case {
    background: var(--surface-1);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}

.case:last-child {
    margin-bottom: 0;
}

.case-kicker {
    margin: 0 0 .3rem;
    font-size: .6875rem;
    font-weight: 700;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: var(--accent-ink);
}

.case-head h3 {
    font-size: 1.0625rem;
    margin-bottom: .6rem;
}

.case-task {
    margin: 0 0 .4rem;
    font-size: .9375rem;
    color: var(--text-secondary);
}

.case-task b {
    color: var(--text-primary);
}

.case-flow {
    margin: 0 0 18px;
    font-family: var(--mono);
    font-size: .8125rem;
    color: var(--text-muted);
}

.case-body {
    display: grid;
    grid-template-columns: 1.55fr 1fr;
    gap: 24px;
    align-items: start;
}

/* ---------- step strip ---------- */

.steps {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.step {
    min-width: 36px;
    height: 30px;
    padding: 0 9px;
    font-family: var(--mono);
    font-size: .75rem;
    font-weight: 650;
    font-variant-numeric: tabular-nums;
    color: var(--text-secondary);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-top: 2px solid var(--border-strong);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background .12s ease, color .12s ease;
}

/* the top edge carries the interface, so selection is never colour-alone */
.step-gui {
    border-top-color: var(--gui);
}

.step-cli {
    border-top-color: var(--cli);
}

.step-control {
    border-top-color: var(--border-strong);
}

.step-result {
    border-top-color: var(--good);
    color: var(--good);
}

.step:hover {
    color: var(--text-primary);
    background: var(--surface-3);
}

.step[aria-selected="true"] {
    color: var(--text-primary);
    background: var(--surface-3);
    border-color: var(--border-strong);
    box-shadow: inset 0 0 0 1px var(--border-strong);
}

.case-frame {
    margin: 0;
}

.case-frame img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 1100 / 619;
    object-fit: cover;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.case-frame figcaption {
    margin-top: .6rem;
    font-size: .8125rem;
    color: var(--text-muted);
}

/* ---------- notes ---------- */

.case-notes p {
    margin: 0 0 .9rem;
    font-size: .875rem;
    line-height: 1.65;
    color: var(--text-secondary);
}

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

.note-tag {
    display: inline-block;
    margin-right: 6px;
    padding: 1px 7px;
    font-size: .6875rem;
    font-weight: 700;
    letter-spacing: .05em;
    border-radius: 4px;
    vertical-align: 1px;
}

.note-gui {
    color: var(--text-primary);
    background: var(--gui-soft);
}

.note-cli {
    color: var(--accent-ink);
    background: var(--cli-soft);
}

.case-analysis {
    padding-top: .9rem;
    border-top: 1px solid var(--border);
}

.case-analysis b {
    color: var(--text-primary);
}

/* ============================== footer ============================== */

.footer {
    padding: 36px 0 32px;
    background: var(--surface-1);
    border-top: 1px solid var(--border);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 22px;
    margin: 0 0 1.25rem;
    font-size: .875rem;
    font-weight: 550;
}

.footer-note {
    margin: 0;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    font-size: .8125rem;
    line-height: 1.7;
    color: var(--text-muted);
    max-width: 78ch;
}

/* ============================== responsive ============================== */

@media (max-width: 900px) {
    .kpis {
        grid-template-columns: repeat(2, 1fr);
    }

    .chart-grid,
    .two-col,
    .two-col-wide,
    .reward-grid {
        grid-template-columns: 1fr;
    }

    .route-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 760px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: var(--nav-h);
        left: 0;
        right: 0;
        display: none;
        flex-direction: column;
        gap: 0;
        padding: 8px;
        background: var(--surface-1);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        padding: 10px 12px;
    }

    .section {
        padding: 52px 0;
    }

    .wrap {
        padding: 0 18px;
    }

    .hero {
        padding-top: 40px;
    }

    .abstract p {
        text-align: left;
        hyphens: manual;
    }

    .kpis {
        grid-template-columns: 1fr;
    }

    .author {
        white-space: normal;
    }

    .card {
        padding: 18px;
    }
}

/* ============================== print / forced colors ============================== */

@media print {
    .nav,
    .theme-toggle,
    .copy-btn,
    .tooltip {
        display: none !important;
    }

    .section,
    .section-alt {
        padding: 18px 0;
        background: #fff;
        border: 0;
    }

    .table-toggle,
    .spec {
        border: 0;
    }

    .table-toggle summary,
    .spec summary {
        display: none;
    }

    details {
        display: block;
    }

    details>*:not(summary) {
        display: block !important;
    }
}

@media (forced-colors: active) {
    .bar-fill,
    .chart .mark {
        forced-color-adjust: none;
    }

    .card,
    .kpi,
    .table-scroll {
        border: 1px solid CanvasText;
    }
}