/* INUGSC site styles, used by every page. Every value here comes from DESIGN.md;
   add new values there first. */

/* ---------- Type ---------- */

@font-face {
    font-family: "Assistant";
    src: url(/font/Assistant.ttf) format("truetype");
    font-weight: 200 800;
    font-display: swap;
}

/* Libre Baskerville: the typeface of the INUGSC lockup (SIL Open Font Licence, see font/) */
@font-face {
    font-family: "Libre Baskerville";
    src: url(/font/LibreBaskerville-latin-400-normal.woff2) format("woff2");
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "Libre Baskerville";
    src: url(/font/LibreBaskerville-latin-500-normal.woff2) format("woff2");
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "Libre Baskerville";
    src: url(/font/LibreBaskerville-latin-400-italic.woff2) format("woff2");
    font-weight: 400;
    font-style: italic;
    font-display: swap;
}

/* ---------- Tokens ---------- */

:root {
    --navy: #1d1d5f;
    --deep-navy: #0e0e33;
    --blue-text: #1d12b2;
    --accent: #8fd0f5;
    --page: #f6f6f6;
    --band: #e1e8f0;
    --white: #ffffff;
    --ink: #14142f;
    --on-dark-muted: rgba(255, 255, 255, 0.72);
    --scrim: rgba(10, 12, 48, 0.62);
    --hairline-light: rgba(29, 29, 95, 0.18);
    --hairline-dark: rgba(255, 255, 255, 0.24);
    --map-base: #d3d8e8;

    --display: "Libre Baskerville", Georgia, serif;
    --text: "Assistant", "Helvetica Neue", Arial, sans-serif;

    --gutter: 4rem;
    --section: 6rem;
    --measure-panel: 32rem;
    --measure-centred: 44rem;

    --header-full: 7.5rem;
    --header-compact: 3.75rem;
    --seal-full: 5.5rem;
    --seal-compact: 2.75rem;

    color-scheme: light;
}

/* ---------- Base ---------- */

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

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

body {
    margin: 0;
    background: var(--page);
    color: var(--ink);
    font-family: var(--text);
    font-size: 1.0625rem;
    font-weight: 300;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

img,
svg,
iframe {
    display: block;
    max-width: 100%;
}

h1,
h2,
h3 {
    font-family: var(--display);
    font-weight: 400;
    letter-spacing: 0.01em;
    margin: 0;
}

p {
    margin: 0 0 1rem;
}

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

b,
strong {
    font-weight: 500;
}

a {
    color: inherit;
}

[hidden] {
    display: none !important;
}

:focus-visible {
    outline: 2px solid currentColor;
    outline-offset: 3px;
}

[id] {
    scroll-margin-top: var(--header-compact);
}

.visually_hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
}

.skip_link {
    position: fixed;
    left: 1rem;
    top: -4rem;
    z-index: 200;
    padding: 0.75rem 1rem;
    background: var(--white);
    color: var(--ink);
    font-weight: 600;
    border-radius: 2px;
}

.skip_link:focus {
    top: 1rem;
}

/* ---------- Surfaces: neighbouring bands never share a colour ---------- */

.band_deep {
    background: var(--deep-navy);
    color: var(--white);
}

.band_navy {
    background: var(--navy);
    color: var(--white);
}

.band_light {
    background: var(--band);
    color: var(--blue-text);
}

.band_white {
    background: var(--white);
    color: var(--blue-text);
}

/* ---------- Actions: one solid button per view, everything else is a text link ---------- */

.button {
    display: inline-block;
    padding: 0.95rem 1.6rem;
    border-radius: 2px;
    font-family: var(--text);
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    transition: background-color 0.2s ease;
}

.button_on_dark {
    background: var(--white);
    color: var(--ink);
}

.button_on_dark:hover {
    background: var(--band);
}

.button_on_light {
    background: var(--navy);
    color: var(--white);
}

.button_on_light:hover {
    background: var(--deep-navy);
}

.text_link {
    font-weight: 500;
    text-decoration: none;
    border-bottom: 1px solid currentColor;
    padding-bottom: 2px;
    transition: opacity 0.2s ease;
}

.text_link:hover {
    opacity: 0.7;
}

/* ---------- Header: full size at the top, condensing as you scroll ---------- */

.site_header {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 2rem;
    height: var(--header-full);
    padding: 0 var(--gutter);           /* the seal and the last link sit on the page's gutter lines */
    background: var(--navy);
    color: var(--white);
}

.site_brand {
    display: flex;
    align-items: center;
    gap: 1.1rem;
    flex-shrink: 0;
    color: inherit;
    text-decoration: none;
}

.site_seal {
    width: var(--seal-full);
    height: var(--seal-full);
    clip-path: circle();
}

.site_lockup {
    font-family: var(--display);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.07em;
    line-height: 1.45;
    white-space: nowrap;
}

.site_nav {
    margin-left: auto;
}

.site_nav ul {
    display: flex;
    gap: 2rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.site_nav a {
    font-size: 1.0625rem;
    font-weight: 400;
    text-decoration: none;
    white-space: nowrap;
    transition: opacity 0.2s ease;
}

.site_nav a:hover {
    opacity: 0.7;
}

.site_menu_button {
    display: none;
}

main {
    padding-top: var(--header-full);
}

/* Only where scroll timelines exist: elsewhere the header simply stays full size */
@supports (animation-timeline: scroll()) {
    .site_header,
    .site_seal,
    .site_lockup {
        animation-timing-function: linear;
        animation-fill-mode: both;
        animation-timeline: scroll(root block);
        animation-range: 0 12rem;
    }

    .site_header {
        animation-name: header-condense;
    }

    .site_seal {
        animation-name: seal-condense;
    }

    .site_lockup {
        animation-name: lockup-condense;
    }
}

@keyframes header-condense {
    to {
        height: var(--header-compact);
    }
}

@keyframes seal-condense {
    to {
        width: var(--seal-compact);
        height: var(--seal-compact);
    }
}

@keyframes lockup-condense {
    to {
        font-size: 0.74rem;
    }
}

/* ---------- First view ---------- */

.first_view {
    position: relative;
    display: flex;
    align-items: flex-end;
    height: calc(100svh - var(--header-full));
    min-height: 34rem;
    overflow: hidden;
    background: var(--deep-navy);
    color: var(--white);
    view-timeline-name: --first-view;
}

.first_view_media {
    position: absolute;
    inset: 0;
}

.first_view_media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 40%;
}

/* Only where view timelines exist: the end state of these is off screen or invisible */
@supports (animation-timeline: view()) {
    .first_view_media img {
        animation: first-view-drift linear both;
        animation-timeline: --first-view;
        animation-range: exit 0% exit 100%;
    }

    .first_view_content {
        animation: first-view-lift linear both;
        animation-timeline: --first-view;
        animation-range: exit 0% exit 70%;
    }
}

.first_view_media::after {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--scrim);
}

.first_view_content {
    position: relative;
    max-width: 78rem;
    padding: 0 var(--gutter) 5.5rem;
}

.first_view_eyebrow {
    margin: 0 0 1rem;
    font-family: var(--display);
    font-size: 1.15rem;
    font-style: italic;
    letter-spacing: 0.03em;
    color: rgba(255, 255, 255, 0.85);
}

.first_view_date {
    font-size: clamp(2.8rem, 5.4vw, 5.6rem);
    line-height: 1.05;
}

.first_view_venue,
.first_view_lead {
    margin: 1.2rem 0 2.4rem;
    font-size: clamp(1.1rem, 1.7vw, 1.45rem);
    letter-spacing: 0.02em;
    color: rgba(255, 255, 255, 0.9);
}

/* Inner pages open with a shorter version of the first view */
.first_view_page {
    height: clamp(26rem, 62svh, 40rem);
    min-height: 0;
}

.first_view_title {
    font-size: clamp(2.4rem, 5.4vw, 4.8rem);
    line-height: 1.05;
}

.first_view_lead {
    max-width: 40rem;
    margin-bottom: 0;
    line-height: 1.45;
}

.first_view_actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem 2rem;
}

@keyframes first-view-drift {
    from {
        transform: translateY(0) scale(1.06);
    }

    to {
        transform: translateY(12vh) scale(1.12);
    }
}

@keyframes first-view-lift {
    from {
        opacity: 1;
        transform: none;
    }

    to {
        opacity: 0;
        transform: translateY(-4rem);
    }
}

/* ---------- Split sections: a text panel beside a photo that drifts as you scroll ---------- */

.split {
    display: flex;
    min-height: 36rem;
}

.split_panel {
    flex: 0 0 44%;
    display: flex;
    align-items: center;
    padding: var(--section) var(--gutter);
}

.split_text {
    max-width: var(--measure-panel);
}

.split_text_right .split_panel {
    order: 2;
}

.split_photo {
    position: relative;
    flex: 1;
    overflow: hidden;
    background: var(--deep-navy);
    view-timeline-name: --photo;
}

.split_photo img {
    position: absolute;
    top: -10vh;
    left: 0;
    width: 100%;
    height: calc(100% + 20vh);
    object-fit: cover;
    animation: photo-drift linear both;
    animation-timeline: --photo;
}

@keyframes photo-drift {
    from {
        transform: translateY(-10vh);
    }

    to {
        transform: translateY(10vh);
    }
}

.panel_heading {
    margin: 0 0 1rem;
    font-size: clamp(2rem, 3.1vw, 2.75rem);
    line-height: 1.15;
}

.panel_sub {
    margin-bottom: 1.6rem;
    font-size: 1.4rem;
    line-height: 1.35;
}

.panel_sub.accent {
    font-family: var(--display);
    font-style: italic;
    font-size: 1.5rem;
    color: var(--accent);
}

.panel_link {
    margin-top: 2rem;
}

/* ---------- Date and venue ---------- */

#venue .split_panel {
    padding-top: 5rem;
    padding-bottom: 5rem;
}

.split_map {
    flex: 1;
    display: flex;
    background: var(--map-base);
}

.split_map iframe {
    flex: 1;
    width: 100%;
    min-height: 30rem;
    border: 0;
}

.details_list {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 1rem 2.2rem;
    margin: 1.8rem 0 0;
}

.details_list dt {
    font-weight: 600;
}

.details_list dd {
    margin: 0;
    line-height: 1.5;
}

.details_list a {
    text-decoration: none;
    border-bottom: 1px solid currentColor;
}

/* ---------- Numbers ---------- */

/* figures sit on the left of their columns, starting on the gutter line like the rest of the page */
.numbers {
    padding: 5.5rem var(--gutter);
}

.numbers_heading {
    margin: 0 0 3rem;
    font-size: clamp(2rem, 3.1vw, 2.75rem);
    line-height: 1.15;
}

.numbers_list {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: minmax(0, 1fr);
    margin: 0;
    padding: 0;
    list-style: none;
}

.numbers_list > li {
    display: flex;
    flex-direction: column;
    padding: 0.4rem 2.5rem 0.6rem;
    border-left: 1px solid var(--hairline-dark);
}

.numbers_list > li:first-child {
    padding-left: 0;
    border-left: 0;
}

.numbers_figure {
    font-family: var(--display);
    font-size: clamp(2.8rem, 6vw, 4.5rem);
    line-height: 1;
    letter-spacing: 0.01em;
}

.numbers_label {
    max-width: 16rem;
    margin-top: 1.1rem;
    color: var(--on-dark-muted);
    line-height: 1.45;
}

.numbers_source {
    max-width: var(--measure-centred);
    margin-top: 3rem;
    font-size: 0.875rem;
    color: var(--on-dark-muted);
}

.numbers_source a {
    text-decoration: none;
    border-bottom: 1px solid currentColor;
}

/* ---------- Text band: a heading column beside a reading column ---------- */

.text_band {
    display: grid;
    grid-template-columns: 44% minmax(0, 1fr);
    padding: var(--section) 0;
}

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

.text_band_head .panel_sub {
    max-width: var(--measure-panel);
    margin-bottom: 0;
}

/* the reading column starts on the same line as the photos in split sections */
.text_band_body {
    max-width: calc(36rem + var(--gutter));
    padding-right: var(--gutter);
}

.text_band_body .details_list {
    margin-top: 2rem;
}

.text_band_body > :first-child {
    margin-top: 0;
}

/* ---------- Year seals ---------- */

.seals {
    padding: 3.5rem var(--gutter);
}

.seal_row {
    display: flex;
    justify-content: center;
    gap: clamp(1rem, 3.2vw, 3.25rem);
    margin: 0;
    padding: 0;
    list-style: none;
}

.seal_row img {
    width: clamp(3.4rem, 10vw, 8.5rem);
    height: auto;
    aspect-ratio: 1;
    clip-path: circle();
}

/* ---------- Delegates ---------- */

.delegates {
    padding: var(--section) var(--gutter) 5rem;
    text-align: center;
}

.delegates_text {
    max-width: var(--measure-centred);
    margin: 0 auto;
}

.band_heading {
    margin: 0 0 1rem;
    font-size: clamp(2rem, 3.3vw, 2.9rem);
    line-height: 1.15;
}

.delegates_map {
    position: relative;
    max-width: 1100px;
    margin: 3.5rem auto 0;
    view-timeline-name: --dotmap;
}

svg.dotmap {
    width: 100%;
    height: auto;
}

/* every dot on the map is the same size, lit or not */
svg.dotmap path {
    fill: none;
    stroke-linecap: round;
    stroke-width: 4.4;
}

path.dotmap_base {
    stroke: var(--map-base);
}

path.dotmap_hl {
    stroke: var(--blue-text);
    transition: stroke 0.2s ease;
}

g.dotmap_country {
    animation: dotmap-light linear both;
    animation-timeline: --dotmap;
}

/* Hovering (or tapping) near a lit country names it; site.js finds the nearest one. */
g.dotmap_country.is_active path.dotmap_hl {
    stroke: var(--navy);
}

.map_label {
    position: absolute;
    left: 0;
    top: 0;
    z-index: 2;
    margin: 0;
    padding: 0.45rem 0.75rem;
    border-radius: 2px;
    background: var(--navy);
    color: var(--white);
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.2;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transform: translate(-50%, calc(-100% - 0.35rem));
    transition: opacity 0.15s ease;
}

.map_label.is_visible {
    opacity: 1;
}

@keyframes dotmap-light {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* ---------- Speakers and workshops, coming soon ---------- */

.coming_soon {
    padding: 18vh var(--gutter) 20vh;
    text-align: center;
}

.coming_soon_pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 72rem;
    margin: 0 auto;
}

.coming_soon_item {
    padding: 0.5rem 2rem;
}

.coming_soon_item + .coming_soon_item {
    border-left: 1px solid var(--hairline-dark);
}

.coming_soon_item h2 {
    font-size: clamp(2.4rem, 5.4vw, 4.8rem);
    line-height: 1.05;
}

.coming_soon_item p {
    margin-top: 1.1rem;
    font-size: clamp(1.1rem, 1.8vw, 1.4rem);
    color: var(--on-dark-muted);
}

.coming_soon_line {
    margin: 12vh 0 0;
    font-family: var(--display);
    font-size: clamp(2rem, 4.8vw, 3.8rem);
    font-style: italic;
    color: var(--accent);
}

/* "Coming soon." letters rise in one after another (site.js splits the line into letters) */
.coming_soon_line.letters_ready .coming_soon_char {
    display: inline-block;
    opacity: 0;
    transform: translateY(0.45em);
    filter: blur(8px);
    transition: opacity 0.9s cubic-bezier(0.2, 0.7, 0.2, 1),
                transform 0.9s cubic-bezier(0.2, 0.7, 0.2, 1),
                filter 0.9s cubic-bezier(0.2, 0.7, 0.2, 1);
    transition-delay: calc(var(--i) * 60ms);
}

.coming_soon_line.letters_in .coming_soon_char {
    opacity: 1;
    transform: none;
    filter: none;
}

/* ---------- Previous sponsors ---------- */

.sponsors {
    padding: 5.5rem var(--gutter) 6.5rem;
    color: var(--ink);
    text-align: center;
}

.sponsor_grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 3rem 0;
    max-width: 72rem;
    margin: 3.5rem auto 0;
    padding: 0;
    list-style: none;
}

.sponsor_grid li {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 calc(100% / 6);
    height: 4.5rem;
    padding: 0 1.25rem;
}

/* Logos are trimmed to their edges, then sized so each covers about the same area:
   a long wordmark comes out wide and low, a square mark small and tall. site.js sets --aspect
   (width / height) once each logo loads. Browsers without sqrt() keep the plain max-height rule. */
.sponsor_grid img {
    --logo-size: 4rem;
    --logo-max-height: 3rem;
    width: auto;
    width: min(100%, calc(var(--logo-size) * sqrt(var(--aspect, 3))), calc(var(--logo-max-height) * var(--aspect, 3)));
    max-width: 100%;
    height: auto;
    max-height: var(--logo-max-height);
    object-fit: contain;
    filter: grayscale(1) contrast(1.05);
    opacity: 0.78;
}

.sponsor_grid img.smaller {
    --logo-size: 3.4rem;
}

/* ---------- Committee: square portraits on the page grid, in the order of people.txt ---------- */

/* an inner page that opens on navy alone, with no photograph behind the title */
.first_view_plain {
    height: clamp(20rem, 48svh, 30rem);
}

.committee {
    padding: var(--section) var(--gutter);
}

/* a wrapping row rather than a grid, so a last row that isn't full sits in the centre */
.committee_grid {
    --columns: 4;
    --column-gap: 2rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 3.5rem var(--column-gap);
    margin: 0;
    padding: 0;
    list-style: none;
}

.person {
    width: calc((100% - (var(--columns) - 1) * var(--column-gap)) / var(--columns));
}

/* the directors take two columns each, so the first row is the two of them */
.person_lead {
    width: calc((100% - var(--column-gap)) / 2);
}

.person_photo {
    aspect-ratio: 1;
    background: var(--band);
}

.person_photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.person_name {
    margin-top: 1.1rem;
    font-size: 1.3rem;
    line-height: 1.25;
    color: var(--ink);
}

.person_lead .person_name {
    font-size: clamp(1.5rem, 2.2vw, 2rem);
}

.person_role {
    margin: 0.35rem 0 0;
    font-weight: 500;
    line-height: 1.35;
}

.person_course {
    margin: 0.15rem 0 0;
    font-size: 0.95rem;
    line-height: 1.4;
    opacity: 0.75;
}

.site_nav a[aria-current="page"] {
    border-bottom: 1px solid currentColor;
    padding-bottom: 2px;
}

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

.site_footer {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem 2rem;
    padding: 2.5rem var(--gutter) 3rem;
    background: var(--page);
    color: var(--blue-text);
    font-size: 0.875rem;
    font-weight: 400;
}

.site_footer p {
    margin: 0;
}

.site_footer ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.75rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.site_footer a {
    text-decoration: none;
    border-bottom: 1px solid var(--hairline-light);
    transition: border-color 0.2s ease;
}

.site_footer a:hover,
.site_footer a[aria-current="page"] {
    border-bottom-color: currentColor;
}

/* ---------- Reveal on scroll ---------- */

.reveal {
    animation: reveal linear both;
    animation-timeline: view();
    animation-range: entry 10% cover 40%;
}

@keyframes reveal {
    from {
        opacity: 0;
        transform: translateY(3rem);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

/* ---------- Laptops: a narrower gutter, and the header kept on one line ---------- */

@media (min-width: 1001px) and (max-width: 1340px) {
    :root {
        --gutter: 3rem;
    }

    .site_header {
        gap: 1.5rem;
    }

    .site_nav ul {
        gap: 1.4rem;
    }

    .site_nav a {
        font-size: 1rem;
    }
}

@media (min-width: 1001px) and (max-width: 1180px) {
    :root {
        --gutter: 2.5rem;
    }

    .site_nav ul {
        gap: 0.8rem;
    }

    .site_nav a {
        font-size: 0.86rem;
    }

    .site_lockup {
        font-size: 0.86rem;
    }
}

/* ---------- Tablets and phones ---------- */

@media (max-width: 1000px) {
    :root {
        --gutter: 1.5rem;
        --section: 3.5rem;
        --header-full: 5rem;
        --header-compact: 3.5rem;
        --seal-full: 3.5rem;
        --seal-compact: 2.25rem;
    }

    /* the menu lines sit 0.6rem inside their button, so the button reaches past the gutter by that much */
    .site_header {
        gap: 1rem;
        padding: 0 calc(var(--gutter) - 0.6rem) 0 var(--gutter);
    }

    .site_brand {
        gap: 0.8rem;
    }

    .site_lockup {
        font-size: 0.74rem;
        letter-spacing: 0.05em;
    }

    @keyframes lockup-condense {
        to {
            font-size: 0.66rem;
        }
    }

    .site_menu_button {
        position: relative;
        display: block;
        width: 2.75rem;
        height: 2.75rem;
        margin-left: auto;
        padding: 0;
        border: 0;
        background: none;
        color: var(--white);
        cursor: pointer;
    }

    .menu_lines,
    .menu_lines::before,
    .menu_lines::after {
        position: absolute;
        left: 0.6rem;
        right: 0.6rem;
        height: 1.5px;
        background: currentColor;
        transition: transform 0.25s ease, opacity 0.25s ease;
    }

    .menu_lines {
        top: 50%;
    }

    .menu_lines::before,
    .menu_lines::after {
        content: "";
        left: 0;
        right: 0;
    }

    .menu_lines::before {
        top: -0.42rem;
    }

    .menu_lines::after {
        top: 0.42rem;
    }

    .menu_open .menu_lines {
        background: transparent;
    }

    .menu_open .menu_lines::before {
        transform: translateY(0.42rem) rotate(45deg);
    }

    .menu_open .menu_lines::after {
        transform: translateY(-0.42rem) rotate(-45deg);
    }

    .site_nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        max-height: 0;
        overflow: hidden;
        margin: 0;
        background: var(--navy);
        transition: max-height 0.3s ease;
    }

    .menu_open .site_nav {
        max-height: 24rem;
    }

    .site_nav ul {
        flex-direction: column;
        gap: 0;
        padding: 0 1rem 1rem;
    }

    .site_nav a {
        display: block;
        padding: 0.9rem 0;
        border-top: 1px solid var(--hairline-dark);
        font-size: 1.1rem;
    }

    .first_view {
        min-height: 30rem;
    }

    .first_view_content {
        padding: 0 var(--gutter) 3rem;
    }

    .first_view_actions {
        flex-direction: column;
        align-items: flex-start;
    }

    .split {
        flex-direction: column;
        min-height: 0;
    }

    .split_panel {
        flex: none;
        padding: 3rem var(--gutter);
    }

    #venue .split_panel {
        padding-top: 3rem;
        padding-bottom: 3rem;
    }

    .split_text_right .split_panel {
        order: 0;
    }

    .split_photo {
        order: -1;
        flex: none;
        height: 40vh;
    }

    .split_map iframe {
        min-height: 20rem;
    }

    .details_list {
        grid-template-columns: 1fr;
        gap: 0.2rem;
    }

    .details_list dd {
        margin-bottom: 0.9rem;
    }

    .numbers {
        padding: 3.5rem var(--gutter);
    }

    .numbers_list {
        grid-auto-flow: row;
        grid-template-columns: 1fr 1fr;
    }

    .numbers_list > li {
        padding: 1.6rem 0 1.6rem 1.25rem;
    }

    .numbers_list > li:nth-child(odd) {
        padding-left: 0;
        border-left: 0;
    }

    .numbers_list > li:nth-child(n + 3) {
        border-top: 1px solid var(--hairline-dark);
    }

    .numbers_list > li:nth-child(-n + 2) {
        padding-top: 0.4rem;
    }

    /* an odd last figure takes the full width rather than sitting alone in a half */
    .numbers_list > li:last-child:nth-child(odd) {
        grid-column: 1 / -1;
    }

    .numbers_label {
        margin-top: 0.7rem;
        font-size: 0.95rem;
    }

    .numbers_heading {
        margin-bottom: 2rem;
    }

    .text_band {
        grid-template-columns: 1fr;
        gap: 1.25rem;
        padding: 3.5rem var(--gutter);
    }

    .text_band_head,
    .text_band_body {
        padding: 0;
    }

    .seals {
        padding: 2.5rem var(--gutter);
    }

    .seal_row {
        flex-wrap: wrap;
        gap: 1.25rem 1.5rem;
        max-width: 20rem;
        margin: 0 auto;
    }

    .seal_row img {
        width: 5rem;
    }

    .delegates {
        padding: 4rem 1.25rem 3.5rem;
    }

    .delegates_map {
        margin-top: 2.5rem;
    }

    svg.dotmap path {
        stroke-width: 5;
    }

    .coming_soon {
        padding: 14vh var(--gutter) 16vh;
    }

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

    .coming_soon_item {
        padding: 2.5rem 0;
    }

    .coming_soon_item + .coming_soon_item {
        border-left: 0;
        border-top: 1px solid var(--hairline-dark);
    }

    .coming_soon_line {
        margin-top: 6vh;
    }

    .sponsors {
        padding: 4rem var(--gutter) 4.5rem;
    }

    .sponsor_grid {
        gap: 2rem 0;
        margin-top: 2.5rem;
    }

    .sponsor_grid li {
        flex-basis: calc(100% / 3);
        height: 3.5rem;
        padding: 0 0.9rem;
    }

    .sponsor_grid img {
        --logo-size: 2.4rem;
        --logo-max-height: 2.2rem;
    }

    .sponsor_grid img.smaller {
        --logo-size: 2rem;
    }

    .site_footer {
        flex-direction: column;
        padding: 2rem var(--gutter) 2.5rem;
    }

    .first_view_plain {
        height: auto;
        min-height: 0;
        padding-top: 5rem;
    }

    .committee_grid {
        --columns: 3;
        --column-gap: 1.25rem;
        row-gap: 2.5rem;
    }

    .person_lead {
        width: calc((100% - (var(--columns) - 1) * var(--column-gap)) / var(--columns));
    }

    .person_lead .person_name {
        font-size: 1.3rem;
    }

    .site_nav a[aria-current="page"] {
        border-bottom: 0;
        padding-bottom: 0.9rem;
        font-weight: 500;
    }
}

@media (max-width: 640px) {
    .committee_grid {
        --columns: 2;
        --column-gap: 1rem;
        row-gap: 2rem;
    }

    .person_name,
    .person_lead .person_name {
        margin-top: 0.8rem;
        font-size: 1.1rem;
    }

    .person_role {
        font-size: 0.95rem;
    }

    .person_course {
        font-size: 0.85rem;
    }
}

/* ---------- Reduced motion: everything sits still in its final place ---------- */

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

    .site_header,
    .site_seal,
    .site_lockup,
    .first_view_media img,
    .first_view_content,
    .split_photo img,
    g.dotmap_country,
    .reveal {
        animation: none;
    }

    .coming_soon_line.letters_ready .coming_soon_char {
        opacity: 1;
        transform: none;
        filter: none;
        transition: none;
    }

    .menu_lines,
    .menu_lines::before,
    .menu_lines::after,
    .site_nav,
    .map_label,
    path.dotmap_hl {
        transition: none;
    }
}