@font-face {
    font-family: "LM Roman 12";
    src: url("fonts/lmroman12-regular.woff2") format("woff2");
    font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
    font-family: "LM Roman 12";
    src: url("fonts/lmroman12-italic.woff2") format("woff2");
    font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
    font-family: "LM Roman 12";
    src: url("fonts/lmroman12-bold.woff2") format("woff2");
    font-weight: 700; font-style: normal; font-display: swap;
}
@font-face {
    font-family: "LM Roman 17";
    src: url("fonts/lmroman17-regular.woff2") format("woff2");
    font-weight: 400; font-style: normal; font-display: swap;
}
/* Spherical Harmonics — site stylesheet.
   A typeset-paper look: Computer Modern, small caps, numbered sections,
   hairline rules. Shared by / and /shop/; page-specific blocks are
   namespaced by class so a page that links this file only gets what it uses. */

/* ---------- Fonts (self-hosted Computer Modern Unicode, see assets/fonts/) ---------- */
@font-face {
    font-family: "CMU Serif";
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url("fonts/cmu-serif-500-roman.woff2") format("woff2");
}

@font-face {
    font-family: "CMU Serif";
    font-style: italic;
    font-weight: 400 500;
    font-display: swap;
    src: url("fonts/cmu-serif-500-italic.woff2") format("woff2");
}

@font-face {
    font-family: "CMU Serif";
    font-style: normal;
    font-weight: 600 700;
    font-display: swap;
    src: url("fonts/cmu-serif-700-roman.woff2") format("woff2");
}

@font-face {
    font-family: "CMU Serif";
    font-style: italic;
    font-weight: 600 700;
    font-display: swap;
    src: url("fonts/cmu-serif-700-italic.woff2") format("woff2");
}

@font-face {
    font-family: "CMU Typewriter Text";
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url("fonts/cmu-typewriter-text-500-roman.woff2") format("woff2");
}

/* ---------- Tokens ---------- */
:root {
    /* Type scale (2026-10-04): four steps. Display is the masthead only. */
    --fs-small: 0.9rem;
    --fs-body: 1.125rem;
    --fs-large: 1.25rem;
    --paper: #faf3e5;
    --paper-deep: #f3eee2;
    --ink: #1b1813;
    --ink-soft: #4f4a40;
    --ink-faint: #7a7366;
    --sienna: #a86b3c;
    --sienna-deep: #8a4f22;
    --lane-green: #2f6a2a;
    --road-yellow: #f2c230;
    --hairline: rgba(27, 24, 19, 0.22);
    --rule: rgba(27, 24, 19, 0.85);
    --logo-filter: grayscale(1) brightness(0);
    --serif: "LM Roman 12", "CMU Serif", "Latin Modern Roman", "Computer Modern", Georgia, "Times New Roman", serif;
    --mono: "CMU Typewriter Text", "Latin Modern Mono", "SF Mono", Menlo, monospace;
    /* Kept for pages that still reference it; everything here is set in --serif. */
    --sans: var(--serif);
    --measure: 66ch;
    --page: 1080px;
    --gutter: 1.25rem;
}

/* Dark only when the reader picks it (toggle, top right); light is the default. */
:root[data-theme="dark"] {
    --paper: #18130d;
    --paper-deep: #1f1c16;
    --ink: #ece6d8;
    --ink-soft: #c2baa8;
    --ink-faint: #8f8878;
    --sienna: #d39a68;
    --sienna-deep: #e0ad7e;
    --lane-green: #8cc47f;
    --hairline: rgba(236, 230, 216, 0.2);
    --rule: rgba(236, 230, 216, 0.8);
    --logo-filter: grayscale(1) brightness(0) invert(1);
}

/* ---------- Base ---------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--serif);
    font-size: var(--fs-body);
    line-height: 1.55;
    color: var(--ink);
    background: var(--paper);
    font-variant-numeric: oldstyle-nums;
    font-kerning: normal;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--road-yellow);
    color: #1b1813;
}

:focus-visible {
    outline: 2px solid var(--sienna-deep);
    outline-offset: 3px;
}

a {
    color: inherit;
}

.sc {
    letter-spacing: 0.01em;
}

.skip-link {
    position: absolute;
    left: -9999px;
    top: 0.5rem;
    background: var(--ink);
    color: var(--paper);
    padding: 0.4rem 0.8rem;
    z-index: 10;
}

.skip-link:focus {
    left: 0.5rem;
}

/* ---------- Masthead ---------- */
.masthead {
    text-align: center;
    padding: 1.4rem var(--gutter) 0.7rem;
}

.masthead-lockup {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
}

.masthead .logo {
    width: 72px;
    height: auto;
}

.masthead h1 {
    font-family: var(--serif);
    font-size: clamp(2.2rem, 6.2vw, 3.8rem);
    font-weight: 500;
    letter-spacing: 0.01em;
    line-height: 1.02;
    text-wrap: balance;
}

.masthead h1 a {
    text-decoration: none;
}

.masthead-meta {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.25rem 1.5rem;
    max-width: var(--page);
    margin: 0.9rem auto 0;
    font-size: var(--fs-small);
    font-style: italic;
    color: var(--ink-soft);
}

.double-rule {
    max-width: var(--page);
    margin: 0 auto;
    border-top: 2px solid var(--rule);
    border-bottom: 0.5px solid var(--rule);
    height: 5px;
}

.rule-wrap {
    padding: 0 var(--gutter);
}

/* ---------- Section nav ---------- */
.section-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.2rem 2rem;
    max-width: var(--page);
    margin: 0 auto;
    padding: 0.55rem var(--gutter);
    border-bottom: 0.5px solid var(--hairline);
    font-size: var(--fs-body);
    letter-spacing: 0.01em;
}

.section-nav a {
    color: var(--ink);
    text-decoration: none;
    padding: 0.1rem 0;
    border-bottom: 1px solid transparent;
}

.section-nav a:hover,
.section-nav a[aria-current="page"] {
    border-bottom-color: var(--ink);
}

.section-nav a.nav-donate {
    font-weight: 700;
    border-bottom-color: var(--road-yellow);
    border-bottom-width: 2px;
}

.section-nav a.nav-donate:hover {
    border-bottom-color: var(--ink);
}

/* ---------- Lead art ---------- */
.lead-art {
    margin: 0;
}

.lead-art img {
    display: block;
    width: 100%;
    height: clamp(220px, 40vw, 440px);
    object-fit: cover;
}

.lead-art figcaption {
    max-width: var(--page);
    margin: 0 auto;
    padding: 0.45rem var(--gutter) 0;
    font-size: var(--fs-small);
    color: var(--ink-faint);
}

/* ---------- Demo bar ---------- */
/* A plain notice under the banner: a live indicator, the product's name, one
   sentence, and a real button. No arrow glyphs anywhere on the site. */
.demo-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.7rem 1.4rem;
    max-width: var(--page);
    margin: 0 auto;
    padding: 0.95rem var(--gutter);
    border-bottom: 0.5px solid var(--hairline);
}

.demo-copy {
    display: flex;
    align-items: baseline;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.2rem 0.75rem;
    margin: 0;
    text-align: center;
}

.demo-bar .live {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    letter-spacing: 0.01em;
    font-weight: 700;
    color: var(--lane-green);
}

.demo-bar .live-dot {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--lane-green);
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--lane-green) 45%, transparent);
    animation: live-pulse 2.4s ease-out infinite;
}

@keyframes live-pulse {
    0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--lane-green) 45%, transparent); }
    70% { box-shadow: 0 0 0 0.45rem transparent; }
    100% { box-shadow: 0 0 0 0 transparent; }
}

/* City Edit's two-line tile logo (an inline <symbol>, see index.html); it
   draws in currentColor, so it follows the page ink in light and dark. Its
   viewBox carries a 9-unit empty margin, so WebKit's whole-pixel clip can't
   shave the outer strokes. Heights are the old ones x 232/214, which keeps the
   tiles the same size. */
.ce-logo {
    display: inline-block;
    color: var(--ink);
    vertical-align: middle;
}

.demo-bar .demo-logo {
    width: auto;
    height: 2.49rem;
    aspect-ratio: 460 / 232;
    align-self: center;
}

.demo-card-logo {
    display: inline-block;
    margin-bottom: 0.7rem;
}

.demo-card-logo .ce-logo {
    height: 3.25rem;
    aspect-ratio: 460 / 232;
}

.foot-demo {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
}

.foot-logo {
    height: 1.79rem;
    aspect-ratio: 460 / 232;
    color: currentColor;
}

.demo-bar .demo-name {
    font-size: var(--fs-large);
    font-weight: 700;
}

.demo-bar .demo-line {
    font-size: var(--fs-body);
    font-style: italic;
    color: var(--ink-soft);
}

.demo-button {
    display: inline-block;
    padding: 0.42rem 1.05rem;
    border: 1px solid var(--lane-green);
    border-radius: 2px;
    color: var(--lane-green);
    letter-spacing: 0.01em;
    font-weight: 700;
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.demo-button:hover,
.demo-button:focus-visible {
    background: var(--lane-green);
    color: var(--paper);
}

/* ---------- Theme toggle ---------- */
.masthead {
    position: relative;
}

.theme-toggle {
    position: absolute;
    top: 0.9rem;
    right: var(--gutter);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    border: 0.5px solid var(--hairline);
    border-radius: 50%;
    background: transparent;
    color: var(--ink-soft);
    cursor: pointer;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
    color: var(--ink);
    border-color: var(--rule);
}

.theme-toggle svg {
    width: 1.1rem;
    height: 1.1rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.6;
    stroke-linecap: round;
    stroke-linejoin: round;
}

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

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

/* The banner has a light and a dark plate; show the one for the page theme. */
.lead-art .art-dark,
:root[data-theme="dark"] .lead-art .art-light {
    display: none;
}

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

/* ---------- Page body ---------- */
.container {
    max-width: var(--page);
    margin: 0 auto;
    padding: 1.75rem var(--gutter) 1rem;
}

.kicker {
    text-transform: lowercase;
    font-variant-caps: small-caps;
    font-size: var(--fs-small);
    font-weight: 700;
    letter-spacing: 0.04em;
    color: var(--sienna-deep);
}

/* ---------- Credibility row (the one open block) ---------- */
.credits {
    border-top: 2px solid var(--rule);
    padding-top: 0.6rem;
    margin-bottom: 2.25rem;
}

.credits-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
    margin-bottom: 1.1rem;
}

.credits-head .note {
    font-size: var(--fs-small);
    font-style: italic;
    color: var(--ink-faint);
}

.logo-row {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.logo-row li {
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 1.3rem 1rem;
}

.logo-row a {
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
}

.logo-row .mark {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 64px;
}

.logo-row img {
    display: block;
    max-width: min(100%, 200px);
    max-height: 64px;
    width: auto;
    height: auto;
    filter: var(--logo-filter);
    opacity: 0.82;
    transition: opacity 0.2s ease;
}

.logo-row a:hover img,
.logo-row a:focus-visible img {
    opacity: 1;
}

.logo-row .relation {
    display: block;
    text-transform: lowercase;
    font-variant-caps: small-caps;
    letter-spacing: 0.04em;
    font-weight: 700;
    color: var(--sienna-deep);
    font-size: var(--fs-small);
    line-height: 1.2;
}

.logo-row .org {
    display: block;
    font-size: var(--fs-small);
    line-height: 1.3;
    color: var(--ink-soft);
}

/* ---------- Collapsible numbered sections ---------- */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    border-top: 2px solid var(--rule);
    padding-top: 0.6rem;
    margin-bottom: 0.1rem;
}

.toolbar button {
    font: inherit;
    font-size: var(--fs-small);
    font-style: italic;
    color: var(--ink-soft);
    background: none;
    border: 0;
    cursor: pointer;
    text-decoration: underline;
    text-decoration-thickness: 0.5px;
    text-underline-offset: 0.2em;
    padding: 0.2rem 0;
}

.toolbar button:hover {
    color: var(--ink);
}

details.sec {
    border-bottom: 0.5px solid var(--hairline);
    scroll-margin-top: 1rem;
}

details.sec > summary {
    display: grid;
    grid-template-columns: 1.4rem 2.6rem 1fr;
    align-items: baseline;
    padding: 0.75rem 0.25rem 0.7rem 0;
    cursor: pointer;
    list-style: none;
}

details.sec > summary::-webkit-details-marker {
    display: none;
}

details.sec > summary::before {
    content: "+";
    grid-column: 1;
    font-family: var(--mono);
    font-size: var(--fs-body);
    color: var(--ink-faint);
}

details.sec[open] > summary::before {
    content: "\2212";
}

details.sec > summary:hover::before,
details.sec > summary:focus-visible::before {
    color: var(--ink);
}

details.sec > summary .num {
    grid-column: 2;
    font-variant-numeric: lining-nums;
    color: var(--sienna-deep);
}

details.sec > summary h2 {
    grid-column: 3;
    font-size: inherit;
    font-weight: inherit;
    line-height: 1.3;
}

details.sec > summary .title {
    letter-spacing: 0.01em;
    font-weight: 700;
    font-size: var(--fs-large);
    margin-right: 0.6em;
}

details.sec > summary .gist {
    font-style: italic;
    color: var(--ink-soft);
}

details.sec > summary:hover .gist {
    color: var(--ink);
}

.sec-body {
    padding: 0.1rem 0 1.6rem 4rem;
    max-width: calc(var(--measure) + 4rem);
}

.sec-body p {
    max-width: var(--measure);
    margin-bottom: 0.85rem;
    hyphens: auto;
}

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

.sec-body a:not(.btn) {
    color: var(--lane-green);
    text-decoration: underline;
    text-decoration-thickness: 0.5px;
    text-underline-offset: 0.18em;
}

.sec-body a:not(.btn):hover {
    text-decoration-thickness: 1.5px;
}

p.drop::first-letter {
    font-weight: 500;
    font-size: 3.1em;
    float: left;
    line-height: 0.8;
    padding: 0.06em 0.1em 0 0;
    color: var(--sienna);
}

/* Footnote-style asides */
.aside {
    font-size: var(--fs-small);
    line-height: 1.45;
    color: var(--ink-soft);
    border-top: 0.5px solid var(--hairline);
    padding-top: 0.6rem;
    margin-top: 1.1rem;
    max-width: var(--measure);
}

.aside sup,
sup.fn {
    font-size: 0.7em;
    line-height: 0;
    color: var(--sienna-deep);
}

sup.fn a {
    text-decoration: none;
    color: inherit;
}

/* Demo card */
.demo-card {
    padding: 0;
}

.demo-card p {
    max-width: var(--measure);
    text-indent: 0 !important;
}

.btn {
    display: inline-block;
    font: inherit;
    font-weight: 700;
    letter-spacing: 0.01em;
    text-decoration: none;
    padding: 0.35rem 1rem 0.45rem;
    border: 1px solid var(--ink);
    color: var(--ink);
    transition: background 0.15s ease, color 0.15s ease;
}

.btn-primary {
    margin-top: 0.8rem;
}

.btn-primary:hover {
    background: var(--ink);
    color: var(--paper);
}

/* Newsletter (card markup is rewritten by scripts/update_latest_post.py; keep class names) */
.post-card {
    border-top: 0.5px solid var(--hairline);
    border-bottom: 0.5px solid var(--hairline);
    padding: 0.8rem 0;
    margin: 1rem 0 0.2rem;
}

.post-card p {
    text-indent: 0 !important;
}

.post-card .dateline {
    letter-spacing: 0.01em;
    color: var(--sienna-deep);
    margin-bottom: 0.1rem;
}

.post-card h3 {
    font-size: var(--fs-large);
    font-weight: 700;
    line-height: 1.2;
    margin: 0.1rem 0 0.3rem;
    text-wrap: balance;
}

.sec-body .post-card h3 a:not(.btn) {
    color: var(--ink);
}

.post-card p:not(.dateline) {
    font-style: italic;
    color: var(--ink-soft);
}

.archive-line {
    letter-spacing: 0.01em;
    margin-top: 0.7rem;
    text-indent: 0 !important;
}

/* People */
.people-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem 2rem;
    margin-bottom: 0.4rem;
}

.person h3 {
    font-size: var(--fs-large);
    font-weight: 700;
}

.person .role {
    font-style: italic;
    color: var(--ink-soft);
    margin: 0 0 0.35rem;
}

.person p {
    font-size: var(--fs-body);
    color: var(--ink-soft);
    text-indent: 0 !important;
}

.contact-note {
    text-indent: 0 !important;
}

/* Acknowledgements */
.funding-note p {
    font-style: italic;
    text-indent: 0 !important;
}

.funding-note strong {
    font-style: normal;
    font-weight: 700;
}

.relations {
    list-style: none;
    margin-top: 0.9rem;
    max-width: var(--measure);
}

.relations li {
    display: grid;
    grid-template-columns: 11rem 1fr;
    gap: 0 1rem;
    padding: 0.35rem 0;
    border-top: 0.5px solid var(--hairline);
    font-size: var(--fs-body);
}

.relations li:last-child {
    border-bottom: 0.5px solid var(--hairline);
}

.relations .relation {
    text-transform: lowercase;
    font-variant-caps: small-caps;
    letter-spacing: 0.04em;
    font-weight: 700;
    color: var(--sienna-deep);
}

/* ---------- Gallery (inside §) ---------- */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: none;
}

.sec-body.wide {
    max-width: none;
}

.gallery-grid figure {
    margin: 0;
}

.gallery-grid img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    display: block;
    filter: saturate(0.85);
    transition: filter 0.25s ease;
}

.gallery-grid figure:hover img {
    filter: saturate(1.05);
}

.gallery-grid figcaption {
    font-size: var(--fs-small);
    color: var(--ink-soft);
    padding-top: 0.3rem;
}

.gallery-grid figcaption::first-line {
    letter-spacing: 0.01em;
}

/* ---------- Footer ---------- */
footer {
    max-width: var(--page);
    margin: 2rem auto 0;
    padding: 0 var(--gutter) 2rem;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 1.5rem 2rem;
    border-top: 2px solid var(--rule);
    padding-top: 1rem;
}

.footer-inner .wordmark {
    font-size: var(--fs-large);
    font-weight: 500;
}

.footer-inner .foot-tag {
    font-size: var(--fs-small);
    font-style: italic;
    color: var(--ink-soft);
    max-width: 36ch;
    margin-top: 0.25rem;
}

.foot-head {
    letter-spacing: 0.01em;
    font-weight: 700;
    color: var(--sienna-deep);
    margin-bottom: 0.35rem;
}

footer a {
    color: var(--ink);
    text-decoration: underline;
    text-decoration-thickness: 0.5px;
    text-underline-offset: 0.18em;
}

footer a:hover {
    text-decoration-thickness: 1.5px;
}

footer ul {
    list-style: none;
}

footer li {
    font-size: var(--fs-small);
    margin-bottom: 0.2rem;
}

.copyright {
    margin-top: 1.5rem;
    padding-top: 0.6rem;
    border-top: 0.5px solid var(--hairline);
    font-size: var(--fs-small);
    color: var(--ink-faint);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.copyright span:last-child {
    letter-spacing: 0.01em;
}

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

    .footer-inner {
        grid-template-columns: 1fr 1fr;
    }

    .footer-inner > div:first-child {
        grid-column: 1 / -1;
    }
}

@media (max-width: 700px) {
    body {
        --fs-body: 1.06rem;
    font-size: var(--fs-body);
    }

    details.sec > summary {
        grid-template-columns: 1.2rem 2.2rem 1fr;
    }

    details.sec > summary .title {
        display: block;
    }

    .sec-body {
        padding-left: 0;
    }

    .people-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .relations li {
        grid-template-columns: 1fr;
    }

    .logo-row {
        grid-template-columns: repeat(2, 1fr);
    }

    .logo-row .mark {
        height: 52px;
    }

    .logo-row img {
        max-height: 52px;
    }

    .masthead-meta {
        justify-content: center;
    }
}

@media (max-width: 540px) {
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        grid-template-columns: 1fr;
    }

    .masthead-lockup {
        gap: 0.8rem;
    }

    .masthead .logo {
        width: 52px;
    }

    .section-nav {
        gap: 0.1rem 1.1rem;
    }

    .demo-bar .demo-line {
    }

    .theme-toggle {
        top: 0.6rem;
        width: 2rem;
        height: 2rem;
    }
}

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

    *,
    *::before,
    *::after {
        transition: none !important;
    }

    .demo-bar .live-dot {
        animation: none;
    }
}

@media print {
    details.sec > .sec-body {
        display: block;
    }

    .toolbar,
    .skip-link {
        display: none;
    }
}

/* ---- Optical sizes (2026-09-30): LaTeX-style — 12pt cut for text, 17pt cut for display; CMU keeps the true small caps. ---- */
:root { --display: "LM Roman 17", "LM Roman 12", "CMU Serif", Georgia, serif; }
body { letter-spacing: -0.003em; }
.masthead h1, .masthead .title, .masthead-lockup h1, .masthead-lockup .wordmark, h1 { font-family: var(--display); letter-spacing: -0.01em; }
.kicker, .logo-row .relation, .relations .relation { font-family: "CMU Serif", var(--serif); }