/* Open London Quantum Computing — 2026 */

:root {
  --bg: #0a0a0f;
  --bg-alt: #101017;
  --panel: #14141c;
  --line: #26262f;
  --line-strong: #3a3a46;
  --text: #f4f4f5;
  --muted: #a3a3ae;
  --accent: #8a3ffc;
  --accent-soft: #be95ff;
  --danger: #ff8389;
  --success: #42be65;
  --shell: 1120px;
  --sans: 'DM Sans', system-ui, -apple-system, Arial, sans-serif;
  --mono: 'DM Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.archive-page {
  --sans: 'IBM Plex Sans', system-ui, -apple-system, Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-underline-offset: .18em; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 2px solid var(--accent-soft); outline-offset: 3px; }
[hidden] { display: none !important; }

h1, h2, h3, p, ul, ol, dl { margin-top: 0; }
h1, h2, h3 { font-weight: 600; letter-spacing: -.02em; line-height: 1.1; }
h1 { margin-bottom: 1.25rem; font-size: clamp(2.35rem, 5.2vw, 3.9rem); letter-spacing: -.03em; }
h2 { margin-bottom: 1rem; font-size: clamp(1.65rem, 3vw, 2.35rem); }
h3 { font-size: 1.1rem; }

.shell { width: min(100% - 2.5rem, var(--shell)); margin-inline: auto; }
.section { padding: clamp(3.75rem, 7vw, 6rem) 0; }
.section + .section { border-top: 1px solid var(--line); }
.lede { max-width: 58ch; color: var(--muted); font-size: 1.075rem; }

.eyebrow {
  margin-bottom: .85rem;
  color: var(--accent-soft);
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.skip-link {
  position: fixed;
  top: .75rem;
  left: .75rem;
  z-index: 100;
  padding: .7rem 1rem;
  background: var(--text);
  color: var(--bg);
  font-weight: 600;
  transform: translateY(-250%);
}
.skip-link:focus { transform: none; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* Buttons ---------------------------------------------------------------- */

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  padding: .7rem 1.35rem;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease;
}
.button:hover { border-color: #a970ff; background: #a970ff; }
.button-secondary { border-color: var(--line-strong); background: transparent; color: var(--text); }
.button-secondary:hover { border-color: var(--text); background: transparent; }
.button-small { min-height: 40px; padding: .5rem 1rem; font-size: .925rem; }
.button-icon { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; transition: transform .15s ease; }
.button:hover .button-icon { transform: translateX(3px); }

/* Header ----------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 10, 15, .88);
  backdrop-filter: blur(10px);
}
.header-inner { display: flex; min-height: 72px; align-items: center; justify-content: space-between; gap: 1.5rem; }

.brand { display: flex; align-items: center; gap: .7rem; text-decoration: none; }
.brand-mark { width: 30px; height: 30px; flex: none; }
.brand-name { display: grid; line-height: 1.25; }
.brand-name strong { font-size: .975rem; font-weight: 600; letter-spacing: -.01em; }
.brand-name span { color: var(--muted); font-family: var(--mono); font-size: .7rem; letter-spacing: .06em; }

.primary-navigation { display: flex; align-items: center; gap: 1.75rem; }
.primary-navigation > a { color: var(--muted); font-size: .95rem; text-decoration: none; }
.primary-navigation > a:hover { color: var(--text); }
.primary-navigation > .button { color: #fff; }

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}
.menu-icon { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.menu-icon-close { display: none; }
.menu-toggle[aria-expanded='true'] { border-color: var(--accent); color: var(--accent-soft); }
.menu-toggle[aria-expanded='true'] .menu-icon-open { display: none; }
.menu-toggle[aria-expanded='true'] .menu-icon-close { display: block; }

/* Hero ------------------------------------------------------------------- */

.hero { position: relative; overflow: hidden; padding: clamp(3.5rem, 8vw, 6.5rem) 0 clamp(7rem, 14vw, 11rem); }
.hero::after {
  position: absolute;
  inset: auto 0 0;
  z-index: 0;
  height: 60%;
  background: linear-gradient(to top, rgba(138, 63, 252, .16), transparent);
  content: '';
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 2; max-width: 44rem; }
.hero h1 { text-wrap: balance; }
.hero-lede { max-width: 40rem; margin-bottom: 2rem; color: var(--muted); font-size: clamp(1.05rem, 1.7vw, 1.2rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem; }

.hero-facts { display: flex; flex-wrap: wrap; gap: .6rem 2rem; margin: 2.75rem 0 0; padding: 1.25rem 0 0; border-top: 1px solid var(--line); list-style: none; }
.hero-facts li { position: relative; padding-left: 1.1rem; color: var(--muted); font-size: .925rem; }
.hero-facts li::before { position: absolute; top: .6em; left: 0; width: 6px; height: 6px; background: var(--accent); content: ''; }

/* The silhouette is black on white: invert + screen drops the paper and keeps the skyline.
   The source leaves 22.5% empty below the buildings, so nudge it down to sit on the edge. */
.hero-skyline { position: absolute; inset: auto 0 0; z-index: 1; pointer-events: none; }
.hero-skyline img {
  width: 100%;
  height: auto;
  opacity: .2;
  filter: invert(1);
  mix-blend-mode: screen;
  transform: translateY(22.5%);
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 45%);
  mask-image: linear-gradient(to bottom, transparent, #000 45%);
}

/* Supporters ------------------------------------------------------------- */

.supporters { padding: clamp(2rem, 4vw, 3rem) 0; border-top: 1px solid var(--line); background: var(--bg-alt); }
.supporters .eyebrow { margin-bottom: 1.25rem; color: var(--muted); }
.supporter-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1.5rem clamp(2rem, 5vw, 4.5rem);
  margin: 0;
  padding: 1.35rem 2rem;
  background: #fff;
  list-style: none;
}
.supporter-card li { display: flex; align-items: center; }
.supporter-card img { width: auto; height: 42px; object-fit: contain; }
.supporter-card .logo-kcl { height: 52px; }
.supporter-card .logo-kq { height: 38px; }
.logo-imperial { display: grid; color: #000; font-family: var(--sans); line-height: .95; }
.logo-imperial strong { font-size: 1.35rem; font-weight: 600; letter-spacing: -.04em; }
.logo-imperial span { margin-top: .25rem; font-size: .72rem; letter-spacing: .02em; }
.logo-ucl { display: grid; color: #000; font-family: var(--sans); line-height: .95; }
.logo-ucl strong { font-size: 1.55rem; font-weight: 600; letter-spacing: -.04em; }
.logo-ucl span { margin-top: .25rem; font-size: .72rem; letter-spacing: .02em; }

/* About ------------------------------------------------------------------ */

.about-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: clamp(2.5rem, 6vw, 5rem); }
.about-copy p { max-width: 50ch; color: var(--muted); }
.about-copy p strong { color: var(--text); font-weight: 600; }

.about-facts { margin: 0; border-top: 1px solid var(--line); }
.about-facts > div { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 1.25rem; padding: 1rem 0; border-bottom: 1px solid var(--line); }
.about-facts dt { color: var(--accent-soft); font-family: var(--mono); font-size: .74rem; letter-spacing: .1em; padding-top: .2em; text-transform: uppercase; }
.about-facts dd { margin: 0; color: var(--muted); font-size: .95rem; }

/* Previous edition ------------------------------------------------------- */

.edition-archive { background: var(--bg-alt); }
.event-video { min-width: 0; margin: 0; }
.event-video video { display: block; width: 100%; aspect-ratio: 16 / 9; background: #000; border: 1px solid var(--line); }
.event-video figcaption { margin-top: .65rem; color: var(--muted); font-size: .85rem; }
.archive-details { margin-top: 1.5rem; }
.archive-grid { display: grid; grid-template-columns: minmax(0, .7fr) minmax(0, 1.3fr); align-items: center; gap: clamp(2rem, 6vw, 5rem); }
.archive-copy h2 span { display: block; color: var(--muted); font-size: .62em; font-weight: 400; letter-spacing: 0; }
.archive-copy p:not(.eyebrow) { max-width: 40ch; margin-bottom: 0; color: var(--muted); }
.archive-video-link {
  display: grid;
  min-height: 17rem;
  place-content: center;
  justify-items: center;
  padding: 2rem;
  border: 1px solid var(--line-strong);
  background: radial-gradient(circle at center, rgba(138, 63, 252, .2), transparent 60%), #08080d;
  text-align: center;
  text-decoration: none;
  transition: border-color .15s ease, background .15s ease;
}
.archive-video-link:hover { border-color: var(--accent-soft); background: radial-gradient(circle at center, rgba(138, 63, 252, .28), transparent 62%), #08080d; }
.archive-video-link strong { margin-top: 1rem; font-size: 1.15rem; }
.archive-video-link span { margin-top: .35rem; color: var(--muted); font-size: .85rem; }
.archive-play { width: 4rem; height: 4rem; border: 1px solid var(--accent-soft); border-radius: 50%; fill: var(--accent-soft); }
.archive-arrow { width: 3.25rem; height: 3.25rem; padding: .75rem; border: 1px solid var(--accent-soft); fill: none; stroke: var(--accent-soft); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; transition: transform .15s ease; }
.archive-video-link:hover .archive-arrow { transform: translateX(4px); }

/* 2025 archive ---------------------------------------------------------- */

.archive-hero { padding: clamp(4rem, 8vw, 7rem) 0; background: radial-gradient(circle at 85% 15%, rgba(138, 63, 252, .2), transparent 32%); }
.archive-hero-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); align-items: center; gap: clamp(2rem, 4vw, 4rem); }
.archive-hero-video h2 { font-size: 1.3rem; }
.archive-hero h1 { max-width: 14ch; text-wrap: balance; }
.archive-hero h1 span { display: block; margin-top: .45rem; color: var(--accent-soft); font-size: .48em; font-weight: 400; letter-spacing: 0; }
.archive-hero .hero-lede { max-width: 42rem; }
.button-icon-back { transition: transform .15s ease; }
.button:hover .button-icon-back { transform: translateX(-3px); }
.archive-summary { margin: 0; border-top: 1px solid var(--line-strong); }
.archive-summary > div { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: 1rem; padding: 1.15rem 0; border-bottom: 1px solid var(--line-strong); }
.archive-summary dt { color: var(--text); font-family: var(--mono); font-size: 1rem; }
.archive-summary dd { margin: 0; color: var(--muted); font-size: .9rem; }
.archive-programme { background: var(--bg-alt); }
.archive-agenda { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.archive-session { display: grid; grid-template-columns: 4rem minmax(0, 1fr); gap: clamp(1.25rem, 4vw, 3.5rem); padding: clamp(1.5rem, 3vw, 2.25rem) 0; border-bottom: 1px solid var(--line); }
.archive-session > div { display: grid; grid-template-columns: minmax(9rem, .55fr) minmax(14rem, 1.1fr) minmax(16rem, 1.35fr); align-items: start; gap: 1rem 2rem; }
.archive-session-number { margin: 0; color: var(--accent-soft); font-family: var(--mono); font-size: .8rem; letter-spacing: .08em; }
.archive-session .session-date { margin: .2rem 0 0; }
.archive-session h3 { margin: 0; font-size: 1.15rem; }
.archive-session > div > p:not(.session-date) { grid-column: 3; margin: 0; color: var(--muted); font-size: .925rem; }
.archive-session .session-meta { grid-column: 2 / -1; margin: 0; padding-top: .25rem; }
.archive-session-break { opacity: .7; }
.archive-session-featured { position: relative; }
.archive-session-featured::before { position: absolute; inset: 0 auto 0 calc(4rem - 1px); width: 2px; background: var(--accent); content: ''; }
.archive-recording { background: var(--bg); padding-top: 0; }
.archive-access-note { margin-top: 1rem !important; font-family: var(--mono); font-size: .76rem; }

/* Programme -------------------------------------------------------------- */

.programme { background: var(--bg-alt); }
.section-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 20rem); align-items: end; gap: 1.5rem 3rem; margin-bottom: 2.5rem; }
.section-head p { margin: 0; }
.data-note { padding-left: 1rem; border-left: 2px solid var(--accent); color: var(--muted); font-size: .9rem; }

.programme-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }

.session-card { display: flex; flex-direction: column; padding: 1.75rem; background: var(--bg-alt); transition: background .15s ease; }
.session-card:hover { background: var(--panel); }
.session-date { margin-bottom: 1rem; color: var(--text); font-family: var(--mono); font-size: .8rem; letter-spacing: .04em; }
.session-card h3 { margin-bottom: .5rem; }
.session-speaker { margin-bottom: .75rem; color: var(--accent-soft); font-size: .9rem; font-weight: 500; }
.session-summary { margin-bottom: 1.5rem; color: var(--muted); font-size: .95rem; }
.session-meta { display: flex; flex-wrap: wrap; gap: .4rem; margin: auto 0 1rem; padding: 0; list-style: none; }
.session-meta li { padding: .2rem .55rem; border: 1px solid var(--line-strong); color: var(--muted); font-family: var(--mono); font-size: .7rem; letter-spacing: .04em; }
.session-status { margin: 0; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--accent-soft); font-size: .85rem; }
.programme-empty { padding: 2rem; border: 1px solid var(--line); color: var(--muted); }

/* Organisers ------------------------------------------------------------- */

.organiser-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(21rem, 1fr));
  gap: 1px;
  margin: 2.25rem 0 0;
  padding: 0;
  border: 1px solid var(--line);
  background: var(--bg);
  list-style: none;
}
.organiser-grid-lead { grid-template-columns: repeat(3, minmax(0, 1fr)); background: var(--bg-alt); }
.organiser-group-title { margin: 3rem 0 1rem; font-size: 1.25rem; }
.organiser { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 1.5rem; padding: 1.75rem; background: var(--bg); box-shadow: inset -1px -1px 0 var(--line); }
.organiser-photo { width: 7.5rem; height: 7.5rem; object-fit: cover; object-position: center top; }
.organiser-photo-frame { position: relative; display: block; overflow: hidden; background: var(--panel); }
.organiser-photo-frame img { width: 100%; height: 100%; max-width: none; object-fit: cover; }
.organiser-photo-ignacio img { object-position: 50% 51%; }
.organiser-photo-benjamin img { object-position: 50% 50%; transform: scale(1.45); }
.organiser-photo-eli img { object-position: 50% 35%; }
.organiser-photo-sofia img { object-position: 50% 57%; transform: scale(1.55); }
.organiser-photo-placeholder {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--panel);
}
.organiser-photo-placeholder::before {
  position: absolute;
  top: 1.8rem;
  left: 50%;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--line-strong);
  content: "";
  transform: translateX(-50%);
}
.organiser-photo-placeholder::after {
  position: absolute;
  bottom: -1.4rem;
  left: 50%;
  width: 5.25rem;
  height: 4.25rem;
  border-radius: 50% 50% 0 0;
  background: var(--line-strong);
  content: "";
  transform: translateX(-50%);
}
.organiser h3 { margin-bottom: .35rem; }
.organiser p { margin-bottom: .9rem; color: var(--muted); font-size: .925rem; }
.organiser .organiser-role { margin-bottom: .25rem; color: var(--accent-soft); font-family: var(--mono); font-size: .72rem; letter-spacing: .04em; text-transform: uppercase; }
.organiser .organiser-affiliation { margin-bottom: .8rem; color: var(--text); font-size: .82rem; font-weight: 500; }
.organiser-link { display: inline-flex; align-items: center; gap: .45rem; color: var(--accent-soft); font-size: .875rem; text-decoration: none; }
.organiser-link:hover { color: var(--accent-soft); text-decoration: underline; }
.organiser-icon { width: 15px; height: 15px; flex: none; fill: currentColor; }

/* Registration ----------------------------------------------------------- */

.registration-grid { display: grid; grid-template-columns: minmax(0, .75fr) minmax(0, 1.25fr); gap: clamp(2rem, 6vw, 4.5rem); }
.registration-intro { position: sticky; top: 6rem; align-self: start; }
.registration-intro p { max-width: 34ch; color: var(--muted); }
.registration-contact { margin: 1.5rem 0 0; padding-top: 1.25rem; border-top: 1px solid var(--line); font-size: .9rem; }
.registration-contact a { color: var(--accent-soft); }

.registration-form { padding: clamp(1.5rem, 3vw, 2.25rem); border: 1px solid var(--line); background: var(--panel); }
.form-field { margin-bottom: 1.25rem; }
.form-field label { display: block; margin-bottom: .45rem; font-size: .925rem; font-weight: 500; }
.form-field label span { color: var(--muted); font-weight: 400; }
.form-field input, .form-field select, .form-field textarea {
  width: 100%;
  min-height: 48px;
  padding: .7rem .85rem;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: var(--bg);
  color: var(--text);
}
.form-field textarea { resize: vertical; }
.form-field select { color-scheme: dark; }
.form-field input::placeholder, .form-field textarea::placeholder { color: #71717f; }
.form-field input:focus, .form-field select:focus, .form-field textarea:focus { border-color: var(--accent-soft); outline: 1px solid var(--accent-soft); outline-offset: 0; }
.form-field [aria-invalid='true'] { border-color: var(--danger); }
.field-error { display: block; margin-bottom: .35rem; color: var(--danger); font-size: .875rem; font-weight: 500; }
.field-error:empty { display: none; }
.field-help { margin: .4rem 0 0; color: var(--muted); font-size: .85rem; }

.checkbox-field { display: grid; grid-template-columns: 20px minmax(0, 1fr); align-items: start; gap: .7rem; margin-bottom: 1.5rem; }
.checkbox-field input { width: 20px; min-height: 20px; margin: .15rem 0 0; accent-color: var(--accent); }
.checkbox-field label { margin: 0; font-size: .9rem; }
.checkbox-field a { color: var(--accent-soft); }
.checkbox-field .field-error { grid-column: 1 / -1; }

.captcha-field { margin-bottom: 1.25rem; }
.error-summary { margin-bottom: 1.5rem; padding: 1rem 1.25rem; border-left: 3px solid var(--danger); background: rgba(255, 131, 137, .08); }
.error-summary h3 { margin-bottom: .5rem; font-size: 1rem; }
.error-summary ul { margin: 0; padding-left: 1.15rem; font-size: .9rem; }
.error-summary a { color: var(--text); }

.form-submit { width: 100%; }
.form-submit:disabled { cursor: wait; opacity: .55; }
.form-status { min-height: 1.5rem; margin: .75rem 0 0; color: var(--danger); font-size: .9rem; }
.form-status:empty { min-height: 0; }

.success-panel { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.5rem 2rem; padding: clamp(1.75rem, 4vw, 2.75rem); border: 1px solid rgba(66, 190, 101, .45); background: rgba(66, 190, 101, .06); }
.success-panel h2 { margin-bottom: .5rem; font-size: clamp(1.5rem, 3vw, 2rem); }
.success-panel p { margin-bottom: 0; color: var(--muted); }
.success-status { margin-bottom: .35rem !important; color: var(--success) !important; font-weight: 600; }
.success-status span { display: inline-block; width: 7px; height: 7px; margin-right: .55rem; border-radius: 50%; background: currentColor; }

/* FAQ -------------------------------------------------------------------- */

.faq { background: var(--bg-alt); }
.faq-grid { display: grid; grid-template-columns: minmax(0, .6fr) minmax(0, 1.4fr); gap: clamp(2rem, 5vw, 4rem); }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1.1rem 0; font-size: 1.025rem; font-weight: 500; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent-soft); }
.faq-chevron { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; color: var(--accent-soft); transition: transform .15s ease; }
.faq details[open] .faq-chevron { transform: rotate(180deg); }
.faq details p { max-width: 62ch; margin: 0; padding: 0 0 1.25rem; color: var(--muted); font-size: .95rem; }

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

.site-footer { padding: 2.5rem 0; border-top: 1px solid var(--line); }
.footer-grid { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.5rem 2rem; }
.footer-grid p { margin: 0; color: var(--muted); font-size: .875rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; }
.footer-nav a { color: var(--muted); font-size: .875rem; }
.footer-nav a:hover { color: var(--text); }

/* Content pages ---------------------------------------------------------- */

.content-main { min-height: 60vh; padding: clamp(3rem, 6vw, 4.5rem) 0 6rem; }
.content-prose { max-width: 42rem; }
.content-prose h1 { font-size: clamp(2rem, 4.5vw, 2.9rem); }
.content-prose h2 { margin-top: 2.25rem; font-size: 1.25rem; }
.content-prose p, .content-prose li { color: var(--muted); }
.content-prose a { color: var(--accent-soft); }
.content-prose .updated { color: var(--muted); font-family: var(--mono); font-size: .78rem; }

.manage-card { max-width: 34rem; padding: clamp(1.5rem, 4vw, 2.25rem); border: 1px solid var(--line); background: var(--panel); }
.manage-card h2 { font-size: 1.35rem; }
.manage-card dl { margin: 1.5rem 0; }
.manage-card dl div { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: 1rem; padding: .85rem 0; border-top: 1px solid var(--line); }
.manage-card dt { color: var(--muted); font-size: .9rem; }
.manage-card dd { margin: 0; }
.danger-button { border-color: var(--danger); background: transparent; color: var(--danger); }
.danger-button:hover { border-color: var(--danger); background: rgba(255, 131, 137, .12); color: var(--danger); }

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

@media (max-width: 880px) {
  .menu-toggle { display: grid; }
  .primary-navigation {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: none;
    gap: 0;
    padding: .5rem 1.25rem 1.25rem;
    border-bottom: 1px solid var(--line);
    background: var(--bg);
  }
  .primary-navigation.is-open { display: grid; }
  .primary-navigation > a:not(.button) { display: flex; min-height: 48px; align-items: center; border-bottom: 1px solid var(--line); }
  .primary-navigation > .button { margin-top: .75rem; }
  .about-grid, .archive-grid, .archive-hero-grid, .registration-grid, .faq-grid, .section-head { grid-template-columns: 1fr; }
  .section-head { align-items: start; }
  .registration-intro { position: static; }
  .registration-intro p { max-width: none; }
  .organiser-grid-lead { grid-template-columns: 1fr; }
  .archive-session > div { grid-template-columns: minmax(10rem, .75fr) minmax(0, 1.25fr); }
  .archive-session > div > p:not(.session-date) { grid-column: 1 / -1; }
  .archive-session .session-meta { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
  .shell { width: min(100% - 2rem, var(--shell)); }
  .hero-actions { display: grid; }
  .hero-actions .button { width: 100%; }
  .hero-facts { gap: .5rem; }
  .hero-facts li { flex: 1 1 100%; }
  .supporter-card { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem 1rem; padding: 1.5rem 1.25rem; }
  .supporter-card li { justify-content: center; }
  .supporter-card img { height: 34px; }
  .supporter-card .logo-kcl { height: 42px; }
  .supporter-card .logo-kq { height: 30px; }
  .about-facts > div { grid-template-columns: 1fr; gap: .15rem; }
  .archive-page .header-inner { align-items: flex-start; flex-direction: column; padding: .85rem 0; }
  .archive-page .footer-nav { gap: .5rem 1rem; }
  .archive-session { grid-template-columns: 2.25rem minmax(0, 1fr); gap: .75rem; }
  .archive-session > div { grid-template-columns: 1fr; gap: .5rem; }
  .archive-session > div > p:not(.session-date), .archive-session .session-meta { grid-column: 1; }
  .archive-session-featured::before { left: calc(2.25rem - 1px); }
  .organiser { grid-template-columns: 1fr; gap: 1.15rem; padding: 1.5rem; }
  .success-panel .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}