@font-face { font-family: "DM Sans"; font-style: normal; font-weight: 400 600; font-display: swap; src: url(assets/fonts/dm-sans.woff2) format("woff2"); }
:root {
  /* color roles */
  --ground: #ffffff;
  --surface: #f3f6f6;
  --surface-hover: #e9f0f0;
  --mint: #c3ddda;
  --mint-hover: #b4d4d0;
  --tint: #e3ebf5;
  --tint-hover: #d4e0ee;
  --ink: #0a2342;
  --ink-muted: #4a5f78;
  --accent: #043a75;
  --accent-hover: #062f5c;
  --on-accent: #ffffff;
  --dark: #0a2342;
  --dark-raised: #123461;
  --on-dark: #ffffff;
  --on-dark-muted: #c3ddda;

  /* type: 5 styles, 1 family, weights 400/500/600 */
  --font: "DM Sans", system-ui, sans-serif;
  --text-display: 600 clamp(48px, 7.2vw, 104px) / 1 var(--font);
  --text-title: 600 32px / 1.2 var(--font);
  --text-heading: 600 20px / 1.3 var(--font);
  --text-body: 400 16px / 1.6 var(--font);
  --text-caption: 400 14px / 1.5 var(--font);

  /* shape */
  --r-sm: 4px;
  --r-control: 8px;
  --r-card: 16px;
  --control-h: 48px;
  --container: 1120px;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { min-height: 100dvh; display: flex; flex-direction: column; margin: 0; background: var(--ground); color: var(--ink); font: var(--text-body); -webkit-font-smoothing: antialiased; }
h1, h2, h3, p, dl, dd, blockquote { margin: 0; }
h1, h2, h3 { text-wrap: balance; letter-spacing: -0.02em; }
h1 { letter-spacing: -0.04em; }
p { max-width: 64ch; }
a { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }

.container { width: min(var(--container), 100% - 48px); margin-inline: auto; }
.muted { color: var(--ink-muted); }
.caption { font: var(--text-caption); color: var(--ink-muted); }
.strong { font-weight: 500; }
.title { font: var(--text-title); }
.heading { font: var(--text-heading); }
.display { font: var(--text-display); }

/* Buttons: one height token */
.btn { display: inline-flex; align-items: center; justify-content: center; height: var(--control-h); padding-inline: 24px; border-radius: var(--r-control); font-weight: 500; text-decoration: none; cursor: pointer; border: 0; transition: background-color 150ms ease, transform 160ms var(--ease-out); }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-inverse { background: var(--on-dark); color: var(--dark); }
.btn-secondary { background: var(--surface); color: var(--ink); }
.btn[aria-disabled="true"] { opacity: .4; pointer-events: none; }
.link { color: var(--accent); font-weight: 500; text-underline-offset: 4px; }

/* Header */
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand img { height: 28px; width: auto; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a:not(.btn) { display: inline-flex; align-items: center; height: 44px; padding-inline: 16px; border-radius: var(--r-control); text-decoration: none; font-weight: 500; color: var(--ink-muted); }
.nav .btn { height: 44px; margin-left: 12px; }

/* Hero */
.masthead { background: var(--dark); color: var(--on-dark); }
.hero { padding-block: 16px 48px; }
.hero h1 { max-width: 20ch; }
.hero p { margin-top: 24px; font: var(--text-heading); font-weight: 400; color: var(--ink-muted); max-width: 40ch; }
.hero-actions { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 8px; }

/* Sections */
.section { padding-block: 32px; }
.section.flush-top { padding-top: 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 16px; }
.section-head p { margin-top: 8px; color: var(--ink-muted); }

/* Tabs */
.tabs { display: inline-flex; gap: 4px; padding: 4px; background: var(--surface); border-radius: var(--r-control); }
.tabs button { height: 40px; padding-inline: 16px; border: 0; border-radius: var(--r-sm); background: transparent; color: var(--ink-muted); font: inherit; font-weight: 500; cursor: pointer; transition: background-color 150ms ease, transform 160ms var(--ease-out); }
.tabs button[aria-pressed="true"] { background: var(--ground); color: var(--ink); }

/* Events */
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.timeline > li { display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 16px; }
.timeline > li[hidden] { display: none; }
.rail { padding-top: 16px; display: flex; flex-direction: column; }
.rail strong { display: block; font-weight: 500; font-variant-numeric: tabular-nums; }
.event { display: block; padding: 16px 24px; background: var(--tint); border-radius: var(--r-card); text-decoration: none; transition: background-color 150ms ease, transform 160ms var(--ease-out); }
.event h3 { margin-bottom: 4px; font: var(--text-heading); }

/* Member of the week */
.spotlight { background: var(--surface); }
.spot { display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 64px; align-items: center; }
.portrait { aspect-ratio: 4 / 5; background: var(--mint); border-radius: var(--r-card); overflow: hidden; }
.portrait img { width: 100%; height: 100%; object-fit: cover; }
.spot-body > * + * { margin-top: 16px; }
.spot-body blockquote { font: var(--text-heading); font-weight: 400; max-width: 40ch; margin-top: 32px; }
.spot-body .actions { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 8px 24px; align-items: center; }

/* Chapters */
.chapters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.chapter { padding: 16px 24px; gap: 8px; background: var(--tint); border-radius: var(--r-card); display: flex; flex-direction: column; align-items: flex-start; }
.chapter p { margin-top: 12px; color: var(--ink-muted); }
.chapter dl { display: flex; gap: 48px; margin: 32px 0; }
.chapter dt { font: var(--text-caption); color: var(--ink-muted); }
.chapter dd { font: var(--text-title); font-variant-numeric: tabular-nums; }

/* Footer */
.site-footer { margin-top: auto; padding-block: 32px; }
.site-footer a { text-underline-offset: 4px; }
.cta-row { display: flex; justify-content: space-between; align-items: end; gap: 32px; flex-wrap: wrap; padding-bottom: 96px; }
.cta-row h2 { max-width: 16ch; }
.foot-row { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; align-items: center; }
.foot-row nav { display: flex; gap: 8px; }
.foot-row a { display: inline-flex; align-items: center; min-height: 44px; padding-inline: 8px; text-underline-offset: 4px; }

@media (max-width: 960px) {
  .section { padding-block: 24px; }
  .hero { padding-block: 8px 24px; }
    .timeline > li { grid-template-columns: 1fr; gap: 8px; }
  .rail { padding-top: 0; flex-direction: row; align-items: baseline; gap: 8px; }
  .spot { grid-template-columns: 1fr; gap: 32px; }
  .portrait { aspect-ratio: 16 / 9; max-width: 480px; }
  .nav a:not(.btn) { display: none; }
  .nav .btn { margin-left: 0; }
}
@media (max-width: 560px) {
  .container { width: calc(100% - 32px); }
  .chapters { grid-template-columns: 1fr; }
    .section-head { flex-direction: column; align-items: start; }
}

.site-footer { background: var(--dark); color: var(--on-dark-muted); }
.site-footer .caption { color: var(--on-dark-muted); }
.site-footer a { color: var(--on-dark); }

.hero { padding-block: 24px 64px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 64px; align-items: center; }
.hero .hero-actions { margin-top: 32px; }
.next { padding: 32px; background: var(--dark-raised); border-radius: var(--r-card); }
.next[hidden] { display: none; }
.next-date { font: var(--text-title); }
.next h2 { margin-top: 8px; }
.next .caption { margin-top: 16px; color: var(--on-dark-muted); }
.section[hidden] { display: none; }
.section { padding-block: 48px; }
.foot { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 32px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 4px 24px; }
.foot-links a { text-decoration: none; }
.site-footer { padding-block: 48px; }
@media (max-width: 960px) {
  .hero { padding-block: 8px 40px; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .next { padding: 24px; }
  .section { padding-block: 32px; }
}
.hero .next p { max-width: none; margin: 0; }
.hero .next .next-date { font: var(--text-title); color: var(--on-dark); }
.hero .next .caption { font: var(--text-caption); color: var(--on-dark-muted); margin-top: 16px; }
.hero .next .btn { margin-top: 24px; }
.btn[hidden] { display: none; }

.photos-section { padding-block: 32px 16px; }
.photos { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.photos img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--r-card); background: var(--mint); }
@media (max-width: 560px) {
  .photos { grid-template-columns: 1fr; }
  .photos img:nth-child(n+2) { display: none; }
}

.photos { grid-template-columns: repeat(3, minmax(0, 1fr)); grid-auto-rows: 200px; }
.photos img { height: 100%; aspect-ratio: auto; }
.photos img:first-child { grid-column: span 2; grid-row: span 2; }
.people { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 24px 16px; }
.people li { display: flex; flex-direction: column; align-items: flex-start; }
.people img { width: 96px; height: 96px; border-radius: 50%; object-fit: cover; background: var(--mint); margin-bottom: 12px; }
.people .caption { margin-top: 4px; }
.person-links { display: flex; flex-wrap: wrap; gap: 4px 16px; margin-top: 8px; }
.section[hidden] { display: none; }
@media (max-width: 560px) {
  .photos { grid-auto-rows: auto; }
  .photos img:first-child { grid-column: auto; grid-row: auto; height: auto; aspect-ratio: 4 / 3; }
}

.sponsors { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 24px 32px; }
.sponsors a { display: flex; align-items: center; gap: 16px; text-decoration: none; }
.sponsors img { width: 64px; height: 64px; border-radius: var(--r-control); }

.hero .lede { font: var(--text-body); color: var(--on-dark-muted); max-width: 56ch; margin-top: 16px; }
.hero .lede + .hero-actions { margin-top: 24px; }

.hero-grid { grid-template-columns: minmax(0, 1fr) 320px; gap: 48px; }
.next { padding: 20px; }
.next-date { font: var(--text-heading); }
.hero .next .next-date { font: var(--text-heading); }
.next h2 { margin-top: 4px; font: var(--text-body); font-weight: 500; color: var(--on-dark); }
.hero .next .caption { margin-top: 8px; }
.hero .next .btn { margin-top: 16px; }
.about-line { padding-block: 32px 8px; }
.about-text { font: var(--text-heading); font-weight: 400; color: var(--ink); max-width: 64ch; }
@media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; } }

.hero-grid { grid-template-columns: minmax(0, 1fr) 480px; }
.next:not([hidden]) { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 24px; }
.hero .next .btn { margin-top: 0; margin-left: auto; flex: none; }
@media (max-width: 960px) { .hero-grid { grid-template-columns: 1fr; } }
.next:not([hidden]) { flex-wrap: nowrap; }
.next > div { flex: 1 1 0; min-width: 0; }
@media (max-width: 560px) { .next:not([hidden]) { flex-wrap: wrap; } .hero .next .btn { margin-left: 0; } }
.hero-actions:has(#join[hidden]) { display: none; }
.hero { padding-block: 16px 32px; }
@media (max-width: 960px) { .hero { padding-block: 8px 24px; } }

.sponsors .slot-logo { position: relative; flex: none; width: 64px; height: 64px; border-radius: var(--r-control); border: 2px dashed var(--ink-muted); }
.sponsors .slot-logo::before, .sponsors .slot-logo::after { content: ""; position: absolute; left: 50%; top: 50%; background: var(--ink-muted); transform: translate(-50%, -50%); }
.sponsors .slot-logo::before { width: 20px; height: 2px; }
.sponsors .slot-logo::after { width: 2px; height: 20px; }
.sponsors .slot .heading { color: var(--accent); font-weight: 500; text-decoration: underline; text-underline-offset: 4px; }

/* v2: editorial pass */
.site-header .container { height: 72px; }
.site-nav { display: flex; gap: 32px; }
.site-nav a { color: var(--on-dark-muted); text-decoration: none; font: var(--text-caption); font-weight: 500; }
.hero { padding-block: 48px 48px; }
.hero h1 { max-width: 13ch; letter-spacing: -0.045em; }
.hero-actions { margin-top: 32px; }
.hero-grid { display: block; }
.next:not([hidden]) { display: grid; grid-template-columns: 160px minmax(0, 1fr) auto; align-items: center; gap: 24px; margin-top: 48px; padding: 24px 32px; background: var(--dark-raised); border-radius: var(--r-card); max-width: none; flex-wrap: initial; }
.hero .next .next-date { font: var(--text-title); color: var(--on-dark); }
.hero .next .heading { font: var(--text-heading); color: var(--on-dark); margin: 0; }
.hero .next .caption { margin-top: 4px; font: var(--text-caption); color: var(--on-dark-muted); }
.hero .next .btn { margin: 0; }
.hero-actions:has(#join[hidden]) { display: none; }
.about-line { padding-block: 64px 32px; }
.about-text { font: var(--text-title); font-weight: 400; letter-spacing: -0.02em; line-height: 1.3; max-width: 32ch; }
.about-text { max-width: 36ch; }
.photos-section { padding-block: 32px 48px; }
.section { padding-block: 48px; }
.people { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 32px 16px; }
.people li { align-items: flex-start; }
.people img { width: 100%; height: auto; aspect-ratio: 4 / 5; border-radius: var(--r-control); object-fit: cover; object-position: center 25%; margin-bottom: 12px; filter: grayscale(1) contrast(1.05); transition: filter 200ms var(--ease-out); background: var(--surface); }
.people .heading { font: var(--text-body); font-weight: 600; }
.sponsors { gap: 16px; }
.sponsors a { padding: 12px 20px 12px 12px; border-radius: var(--r-card); background: var(--surface); transition: background-color 150ms ease, transform 160ms var(--ease-out); }
.sponsors img { filter: grayscale(1); transition: filter 200ms var(--ease-out); }
.sponsors .heading { font: var(--text-body); font-weight: 600; }
.sponsors .slot .heading { font-weight: 500; }
.site-footer { padding-block: 48px 0; overflow: hidden; }
.foot-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 32px; padding-bottom: 48px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 4px 24px; }
.foot-links a { text-decoration: none; color: var(--on-dark); }
.foot-mark { width: 100%; height: auto; display: block; margin-bottom: -4%; opacity: 1; }
@media (max-width: 960px) {
  .people { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .next:not([hidden]) { grid-template-columns: 1fr; gap: 12px; padding: 24px; }
  .hero .next .btn { justify-self: start; margin-top: 8px; }
  .about-line { padding-block: 40px 24px; }
}
@media (max-width: 560px) {
  .site-nav { gap: 20px; }
  .site-nav a:last-child { display: none; }
  .people { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero { padding-block: 32px 32px; }
}
.about-text { max-width: 44ch; }
@media (max-width: 560px) {
  .photos { grid-template-columns: 1fr; grid-auto-rows: auto; }
  .photos img:first-child { grid-column: auto; grid-row: auto; height: auto; aspect-ratio: 4 / 3; }
  .photos img:nth-child(n+2) { display: none; }
}

/* motion */
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.hero h1 { animation: rise 450ms var(--ease-out) both; }
.next:not([hidden]) { animation: rise 450ms var(--ease-out) 80ms both; }
.btn:active { transform: scale(0.97); }
a.event:active, .sponsors a:active { transform: scale(0.99); }
.link, .site-nav a, .foot-links a { transition: color 150ms ease, text-decoration-color 150ms ease; }
.masthead :focus-visible, .site-footer :focus-visible { outline-color: var(--on-dark); }
.next-date, .chapter .caption { font-variant-numeric: tabular-nums; }
.about-text, .chapter p { text-wrap: pretty; }
@media (hover: hover) and (pointer: fine) {
  .btn-primary:hover { background: var(--accent-hover); }
  .btn-inverse:hover { background: var(--tint-hover); }
  .btn-secondary:hover { background: var(--surface-hover); }
  .link:hover { color: var(--ink); }
  .nav a:not(.btn):hover { background: var(--surface); color: var(--ink); }
  .tabs button:hover { color: var(--ink); }
  a.event:hover { background: var(--tint-hover); }
  a.event:hover .caption { color: var(--ink); }
  .foot-row a:hover { text-decoration: underline; }
  .foot-links a:hover { text-decoration: underline; }
  .sponsors a:hover span { text-decoration: underline; text-underline-offset: 4px; }
  .site-nav a:hover { color: var(--on-dark); }
  .people li:hover img { filter: none; }
  .sponsors a:hover { background: var(--surface-hover); }
  .sponsors a:hover span { text-decoration: none; }
  .sponsors a:hover img { filter: none; }
  .foot-links a:hover { text-decoration: underline; text-underline-offset: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero h1, .next:not([hidden]) { animation-name: fade; animation-delay: 0ms; }
  .btn:active, a.event:active, .sponsors a:active { transform: none; }
}

/* speakers */
.speakers { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 24px 8px; }
.speakers li { width: 128px; }
.speakers a { display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; }
.speakers img { width: 72px; height: 90px; border-radius: var(--r-control); object-fit: cover; object-position: center 25%; background: var(--surface); filter: grayscale(1) contrast(1.05); transition: filter 200ms var(--ease-out), transform 160ms var(--ease-out); }
.speakers .caption { line-height: 1.3; white-space: nowrap; }
.speakers a:active img { transform: scale(0.97); }
@media (hover: hover) and (pointer: fine) { .speakers a:hover img { filter: none; } }

/* tighter section rhythm */
.section { padding-block: 24px; }
.section-head { margin-bottom: 12px; }

.about-text { font: var(--text-heading); font-weight: 400; letter-spacing: 0; line-height: 1.5; max-width: 60ch; }

/* photo fade-in on load; color on touch where hover never fires */
img.fade { opacity: 0; transition: opacity 200ms var(--ease-out), filter 200ms var(--ease-out), transform 160ms var(--ease-out); }
img.fade.loaded { opacity: 1; }
@media (hover: none) { .people img, .sponsors img, .speakers img { filter: none; } }

/* 44px touch targets for text links */
@media (pointer: coarse) { .site-nav a, .person-links a, .chapter a { display: inline-flex; align-items: center; min-height: 44px; } }

/* skip link: visible on keyboard focus only */
.skip { position: absolute; left: 16px; top: -64px; z-index: 10; padding: 12px 16px; border-radius: var(--r-control); background: var(--on-dark); color: var(--dark); text-decoration: none; font-weight: 500; }
.skip:focus-visible { top: 16px; outline: 2px solid var(--on-dark); outline-offset: 2px; }
main:focus { outline: none; }

.next.loading { visibility: hidden; }
#join[hidden] { display: none; }

/* group cards */
#groups { padding-bottom: 112px; }
.chapters { gap: 16px; }
.chapter { position: relative; justify-content: space-between; min-height: 200px; padding: 32px; gap: 24px; transition: background-color 150ms ease, transform 160ms var(--ease-out); }
.chapter .caption { margin-top: 8px; }
.chapter .link { text-decoration: none; font-weight: 500; }
.chapter .link::after { content: ""; position: absolute; inset: 0; border-radius: var(--r-card); }
.chapter .arrow { display: inline-block; transition: transform 200ms var(--ease-out); }
.chapter:active { transform: scale(0.99); }
@media (hover: hover) and (pointer: fine) {
  .chapter:hover { background: var(--tint-hover); }
  .chapter:hover .arrow { transform: translateX(4px); }
}
@media (prefers-reduced-motion: reduce) { .chapter:active { transform: none; } .chapter:hover .arrow { transform: none; } }
.foot-mark { margin-bottom: -5%; }
.chapter { justify-content: flex-start; }
.chapter .caption span { display: block; }
.chapter .link { margin-top: auto; }

/* events page */
.note { margin-top: 24px; color: var(--ink-muted); }
.tabs button { transition: background-color 150ms ease, color 150ms ease; }

/* hero text link to the events page */
.more-events { margin-top: 16px; }
.more-events a { color: var(--on-dark); font-weight: 500; text-underline-offset: 4px; transition: text-decoration-color 150ms ease; }
.more-events span { display: inline-block; transition: transform 200ms var(--ease-out); }
@media (hover: hover) and (pointer: fine) { .more-events a:hover span { transform: translateX(4px); } }
@media (pointer: coarse) { .more-events a { display: inline-flex; align-items: center; min-height: 44px; } }

/* submit an event */
.submit-copy { max-width: 56ch; color: var(--ink-muted); }
.submit-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 24px; margin-top: 16px; }
.btn-ink { background: var(--dark); color: var(--on-dark); border: 0; font: inherit; font-weight: 500; cursor: pointer; }
#submit { padding-bottom: 112px; }
@media (hover: hover) and (pointer: fine) { .btn-ink:hover { background: var(--dark-raised); } }