:root {
  --paper: #f5f8f7;
  --tint: #e6efec;
  --ink: #0e2a2f;
  --ink-soft: #46605f;
  --harbour: #1f6f68;
  --tag: #f4c542;
  --line: #cfdcd8;
  --white: #ffffff;

  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --body: "Public Sans", system-ui, sans-serif;
  --gutter: clamp(16px, 4vw, 40px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; }
a { color: var(--harbour); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--tag); outline-offset: 2px; border-radius: 2px; }
code { font-size: .88em; background: var(--tint); padding: .1em .35em; border-radius: 4px; word-break: break-word; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--white); padding: 8px 12px; z-index: 20; }
.skip:focus { left: 8px; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 var(--gutter); }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font: 800 1.15rem/1 var(--display); color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.brand span { color: var(--harbour); }
.nav nav { display: flex; gap: 1.5rem; }
.nav nav a { color: var(--ink); text-decoration: none; font-size: .95rem; }
.nav nav a:hover { color: var(--harbour); text-decoration: underline; }
.nav-toggle { display: none; font: 600 .95rem var(--body); background: none; border: 1px solid var(--line); color: var(--ink); padding: 6px 12px; border-radius: 6px; cursor: pointer; }

/* Hero */
.hero { padding: clamp(48px, 9vw, 112px) 0 clamp(56px, 8vw, 96px); border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.edition { font: 600 1.15rem/1.3 var(--display); color: var(--harbour); margin: 0 0 .5rem; }
.hero h1 {
  font: 800 clamp(2.6rem, 6.4vw, 5rem)/.98 var(--display);
  letter-spacing: -.035em;
  margin: 0 0 1.5rem;
  max-width: 12ch;
}
.hero-meta { font-size: 1.15rem; color: var(--ink-soft); margin: 0 0 2rem; }
.hero-meta a { font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-block; font: 600 1rem/1 var(--body); text-decoration: none;
  padding: 14px 22px; border-radius: 999px; border: 2px solid var(--ink);
}
.btn-primary { background: var(--ink); color: var(--white); }
.btn-primary:hover { background: var(--harbour); border-color: var(--harbour); color: var(--white); }
.btn-ghost { color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--white); }
.btn[aria-disabled="true"] { background: var(--tint); color: var(--ink-soft); border-color: var(--line); pointer-events: none; }

/* Agent window: the one memorable element */
.agent {
  margin: 0; background: var(--white); border: 1px solid var(--line); border-radius: 18px;
  box-shadow: 0 1px 0 var(--line), 0 24px 48px -28px rgba(14, 42, 47, .45);
  overflow: hidden;
}
.agent-bar { display: flex; gap: 6px; padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--paper); }
.agent-bar span { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.agent-body { padding: 20px; display: flex; flex-direction: column; gap: 12px; font-size: .98rem; }
.msg { margin: 0; max-width: 88%; padding: 10px 14px; border-radius: 14px; }
.msg-user { align-self: flex-end; background: var(--ink); color: var(--white); border-bottom-right-radius: 4px; }
.msg-agent { align-self: flex-start; background: var(--tint); border-bottom-left-radius: 4px; }
.result {
  align-self: flex-start; max-width: 100%; width: 100%;
  border: 1px solid var(--line); border-radius: 12px; padding: 16px; position: relative;
}
.result::before {
  content: ""; position: absolute; top: 14px; right: 14px; width: 18px; height: 18px;
  background: var(--tag); border-radius: 3px 3px 3px 50%; transform: rotate(45deg);
}
.result-title { font: 800 1.25rem/1.2 var(--display); margin: 0 0 .75rem; }
.result dl { margin: 0 0 1rem; display: grid; gap: 6px; }
.result dl div { display: grid; grid-template-columns: 6.5em 1fr; gap: 8px; }
.result dt { color: var(--ink-soft); }
.result dd { margin: 0; font-weight: 600; }
.result-cta {
  display: block; text-align: center; background: var(--tag); color: var(--ink);
  font-weight: 600; text-decoration: none; padding: 10px; border-radius: 8px;
}
.result-cta:hover { background: #e9b520; color: var(--ink); }

@media (prefers-reduced-motion: no-preference) {
  .agent .msg { opacity: 0; transform: translateY(6px); animation: arrive .45s ease-out forwards; }
  .agent .msg-user { animation-delay: .3s; }
  .agent .msg-agent { animation-delay: 1.1s; }
  .agent .result { animation-delay: 1.6s; }
  @keyframes arrive { to { opacity: 1; transform: none; } }
}

/* Sections */
.section { padding: clamp(56px, 8vw, 96px) 0; }
.section-tint { background: var(--tint); }
h2 { font: 800 clamp(1.8rem, 3.4vw, 2.5rem)/1.1 var(--display); letter-spacing: -.02em; margin: 0 0 1rem; }
h3 { font: 600 1.25rem/1.25 var(--display); margin: 0 0 .75rem; }
.two-col { display: grid; grid-template-columns: minmax(200px, 1fr) 2fr; gap: clamp(24px, 5vw, 72px); align-items: start; }
.prose { max-width: 68ch; }
.prose p:first-child { margin-top: 0; }
.note { color: var(--ink-soft); font-size: .95rem; }

/* Topics */
.topics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 2.5rem; border-top: 2px solid var(--ink); }
.topic { padding: 1.5rem 1.25rem 0 0; }
.topic + .topic { padding-left: 1.25rem; border-left: 1px solid var(--line); }
.topic ul { margin: 0; padding: 0; list-style: none; }
.topic li { padding: .45rem 0; border-bottom: 1px solid var(--line); font-size: .97rem; line-height: 1.45; }
.topic li:last-child { border-bottom: 0; }
.topic-focus h3 { color: var(--harbour); }
.focus-note {
  display: inline-block; margin: -.25rem 0 .5rem; background: var(--tag);
  font-size: .82rem; font-weight: 600; padding: 2px 8px; border-radius: 4px;
}

/* Submission */
.limit {
  display: flex; align-items: center; gap: 20px; margin: 1.5rem 0;
  background: var(--ink); color: var(--white); padding: 18px 22px; border-radius: 8px;
}
.limit p { margin: 0; }
.limit-num {
  flex: none; font: 800 clamp(1.8rem, 4vw, 2.4rem)/1 var(--display); letter-spacing: -.02em;
  color: var(--ink); background: var(--tag); padding: 8px 14px; border-radius: 6px;
}
.limit-text strong { display: block; font-family: var(--display); font-size: 1.15rem; }
@media (max-width: 480px) { .limit { flex-direction: column; align-items: flex-start; } }
.paper-types { list-style: none; padding: 0; margin: 1.5rem 0; display: grid; gap: 12px; }
.paper-types li { background: var(--white); border: 1px solid var(--line); border-left: 4px solid var(--harbour); padding: 14px 18px; border-radius: 6px; }
.paper-types strong { display: block; font-family: var(--display); font-size: 1.1rem; }

/* Dates (a real sequence) */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 10px; bottom: 10px; width: 2px; background: var(--line); }
.timeline li { position: relative; padding: 0 0 1.5rem 36px; display: grid; grid-template-columns: 10em 1fr; gap: 12px; }
.timeline li::before {
  content: ""; position: absolute; left: 0; top: 6px; width: 16px; height: 16px; border-radius: 50%;
  background: var(--paper); border: 2px solid var(--harbour);
}
.timeline time { font: 600 1.1rem/1.4 var(--display); }
.timeline .is-event::before { background: var(--tag); border-color: var(--ink); }
.timeline .is-event span { font-weight: 600; }

/* Schedule */
.schedule { width: 100%; border-collapse: collapse; }
.schedule th, .schedule td { text-align: left; vertical-align: top; padding: 14px 0; border-bottom: 1px solid var(--line); }
.schedule th { width: 5.5em; font: 600 1.1rem/1.4 var(--display); font-variant-numeric: tabular-nums; color: var(--harbour); }
.schedule td { font-weight: 600; }
.schedule .who { display: block; font-weight: 400; color: var(--ink-soft); font-size: .95rem; }
.schedule .break td, .schedule .break th { color: var(--ink-soft); font-weight: 400; }
.schedule .break td { font-style: italic; }

/* Organizers */
.people { list-style: none; padding: 0; margin: 2rem 0 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 32px 24px; }
.people li { margin: 0; }
.mono {
  display: grid; place-items: center; width: 72px; height: 72px; border-radius: 50%;
  background: var(--tint); color: var(--harbour); font: 800 1.35rem/1 var(--display); margin-bottom: .75rem;
}
.people .name { margin: 0; font-weight: 600; }
.people .aff { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.contact { margin-top: 3rem; }

/* Editions */
.editions { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.5rem; }
.editions a, .editions span { font: 600 1.15rem/1.3 var(--display); }
.editions p { margin: .25rem 0 0; color: var(--ink-soft); max-width: 60ch; }
.editions .current span { background: linear-gradient(transparent 60%, var(--tag) 60%); }

/* Footer */
.footer { background: var(--ink); color: #c9d8d5; padding: 32px 0; font-size: .95rem; }
.footer a { color: var(--white); }
.footer p { margin: 0; }

/* Responsive */
@media (max-width: 960px) {
  .topics { grid-template-columns: 1fr 1fr; }
  .topic:nth-child(3) { padding-left: 0; border-left: 0; }
  .topic:nth-child(n+3) { margin-top: 1rem; border-top: 1px solid var(--line); }
}
@media (max-width: 820px) {
  .hero-grid, .two-col { grid-template-columns: 1fr; }
  .nav-toggle { display: block; }
  .nav nav {
    display: none; position: absolute; top: 60px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--line); padding: 8px var(--gutter) 16px;
  }
  .nav nav.open { display: flex; }
  .nav nav a { padding: 10px 0; }
}
@media (max-width: 560px) {
  .topics { grid-template-columns: 1fr; }
  .topic, .topic + .topic { padding-left: 0; border-left: 0; }
  .topic + .topic { margin-top: 1rem; border-top: 1px solid var(--line); }
  .timeline li { grid-template-columns: 1fr; gap: 0; }
  .msg { max-width: 100%; }
}
img.mono { object-fit: cover; object-position: center 25%; }
.timeline .is-open::before { background: var(--harbour); }
.timeline .is-open time { color: var(--harbour); }

/* How to submit: a real 3-step sequence */
.howto {
  background: var(--white); border: 2px solid var(--ink); border-radius: 14px;
  padding: 20px 22px 22px; margin: 0 0 2rem;
}
.howto h3 { margin-bottom: 1rem; }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; counter-reset: step; }
.step {
  counter-increment: step; position: relative; display: flex; flex-direction: column; justify-content: space-between; gap: 12px;
  padding: 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper);
}
.step-text { margin: 0; font-size: .97rem; line-height: 1.45; }
.step-text::before {
  content: counter(step); display: inline-grid; place-items: center; width: 26px; height: 26px; margin-right: 8px;
  border-radius: 50%; background: var(--ink); color: var(--white); font: 800 .9rem/1 var(--display); vertical-align: 1px;
}
.mock { background: var(--white); border: 1px solid var(--line); border-radius: 8px; padding: 10px; font-size: .8rem; color: var(--ink-soft); }
.mock-url { display: block; padding: 6px 8px; background: var(--tint); border-radius: 999px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mock-btn { display: inline-block; padding: 7px 10px; border-radius: 6px; background: var(--harbour); color: var(--white); font-weight: 600; }
.mock-menu { display: grid; gap: 2px; padding: 6px; }
.mock-menu span { padding: 5px 8px; border-radius: 5px; }
.mock-menu .pick { background: var(--tag); color: var(--ink); font-weight: 600; }
.howto-cta { margin: 1.25rem 0 0; }

@media (prefers-reduced-motion: no-preference) {
  .step { animation: step-focus 6s infinite; }
  .step:nth-child(2) { animation-delay: 2s; }
  .step:nth-child(3) { animation-delay: 4s; }
  .step:nth-child(2) .mock-btn { animation: press 6s infinite 2s; }
  .step:nth-child(3) .pick { animation: pick 6s infinite 4s; }
  @keyframes step-focus {
    0%, 30% { border-color: var(--harbour); box-shadow: 0 0 0 2px var(--harbour); background: var(--white); }
    36%, 100% { border-color: var(--line); box-shadow: none; background: var(--paper); }
  }
  @keyframes press { 0%, 8% { transform: none; } 12% { transform: scale(.94); } 18%, 100% { transform: none; } }
  @keyframes pick { 0%, 6% { background: transparent; } 12%, 100% { background: var(--tag); } }
}

@media (max-width: 960px) { .steps { grid-template-columns: 1fr; } }