/* =================== THEME =================== */
:root{
    --brand: #1d4ed8;
    --brand-2: #0ea5e9;
    --bg: #ffffff;
    --text: #0f172a;
    --muted: #f6f7f9;
    --subtext: #475569;
    --border: #e5e7eb;
    --card: #ffffff;
    --radius: 16px;
    --shadow: 0 1px 2px rgba(0,0,0,0.05), 0 10px 25px rgba(0,0,0,0.07);
}
@media (prefers-color-scheme: dark){
    :root{
    --bg: #0b1220;
    --text: #e5e7eb;
    --muted: #0f172a;
    --subtext: #94a3b8;
    --border: #1f2a44;
    --card: #0f172a;
    --shadow: 0 1px 2px rgba(0,0,0,0.35), 0 10px 25px rgba(0,0,0,0.3);
    }
}
/* Base */
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family: ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji";}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:24px}
.visually-hidden{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);white-space:nowrap}

/* Hero */
.hero{
    background: radial-gradient(1200px 500px at 10% -20%, rgba(29,78,216,0.18), transparent 60%),
                radial-gradient(1200px 500px at 90% -20%, rgba(14,165,233,0.18), transparent 60%);
    border-bottom:1px solid var(--border);
}
.hero-inner{max-width:1100px;margin:0 auto;padding:36px 24px 28px}
.kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.08em;color:#fff;background:linear-gradient(90deg,var(--brand),var(--brand-2));padding:6px 10px;border-radius:999px;box-shadow:var(--shadow)}
.title{font-size:clamp(28px,4vw,44px);margin:12px 0 8px}
.meta{color:var(--subtext);font-size:clamp(14px,2.2vw,16px)}

/* Nav */
.tabs{position:sticky;top:0;background:rgba(255,255,255,0.82);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border);z-index:30}
@media (prefers-color-scheme: dark){ .tabs{background:rgba(11,18,32,0.82);} }
.tabs-inner{max-width:1100px;margin:0 auto;display:flex;gap:10px;padding:10px 24px}
.tab{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;border:1px solid var(--border);background:var(--card);box-shadow:var(--shadow);font-weight:600}
.tab[aria-current="page"]{background:linear-gradient(90deg,var(--brand),var(--brand-2));color:#fff;border-color:transparent}

/* Sections */
section{scroll-margin-top:74px}
h2{font-size:clamp(20px,3.5vw,28px);margin:22px 0 12px}
.lead{color:var(--subtext)}

/* Overview */
/* .overview{display:grid;grid-template-columns:1fr;gap:12px}
.slot{display:grid;grid-template-columns:136px 1fr;gap:12px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:7px 8px;box-shadow:var(--shadow)}
.slot .time{font-weight:700}
.slot .what{color:var(--subtext)}
@media (max-width:560px){ .slot{grid-template-columns:1fr} } */


/* === OVERVIEW — COMPACT === */
.overview{
  display:grid;
  gap:6px;                    /* less space between rows */
}

.slot{
  display:grid;
  grid-template-columns: 96px 1fr;  /* narrower time column */
  align-items: baseline;
  gap:8px;                    /* tighter gap */
  padding:4px 0;              /* much less vertical padding */
  border:0;                   /* no border */
  background:transparent;     /* no card look */
  box-shadow:none;            /* remove any shadow if present */
}

.slot .time{
  font-weight:600;
  font-size:0.95rem;
  line-height:1.2;
}

.slot .what{
  color:var(--text);
  font-size:0.95rem;
  line-height:1.2;
}

/* subtle divider between rows (optional) */
.slot:not(:last-child){
  border-bottom:1px solid var(--border);
}

@media (max-width:560px){
  .slot{ grid-template-columns: 1fr; } /* stacks cleanly on phones */
}

/* Filters & Search */
.controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:10px 0 14px}
.chip{padding:7px 12px;border-radius:999px;border:1px solid var(--border);background:var(--card);cursor:pointer;user-select:none}
.chip.active{background:linear-gradient(90deg,var(--brand),var(--brand-2));color:#fff;border-color:transparent}
.search{flex:1 1 240px;display:flex;align-items:center;gap:8px;border:1px solid var(--border);background:var(--card);padding:8px 10px;border-radius:999px}
.search input{border:0;outline:0;background:transparent;width:100%;color:inherit;font-size:15px}

/* Sessions */
.session{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);margin:12px 0;box-shadow:var(--shadow);overflow:hidden}
.session > summary{list-style:none;cursor:pointer;padding:14px 16px;font-weight:700;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.session > summary::-webkit-details-marker{display:none}
.session-header{list-style:none;padding:8px 16px;font-weight:700;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.session-header::-webkit-details-marker{display:none}
.badge{font-size:12px;padding:4px 8px;border-radius:999px;background:var(--muted);border:1px solid var(--border);color:var(--subtext)}
.talks{border-top:1px solid var(--border);padding:6px 0}
.talk{display:grid;grid-template-columns:120px 1fr;gap:12px;padding:12px 16px}
.talk+.talk{border-top:1px dashed var(--border)}
.talk-time{font-weight:700}
.talk-title{font-weight:700}
.talk-meta{color:var(--subtext);font-size:0.95rem;margin-top:2px}
@media (max-width:560px){ .talk{grid-template-columns:1fr} }

/* Footer & utilities */
footer{margin:40px 0 24px;color:var(--subtext);font-size:0.92rem}
.top{position:fixed;right:16px;bottom:16px;background:linear-gradient(90deg,var(--brand),var(--brand-2));color:#fff;border:none;border-radius:999px;padding:10px 12px;box-shadow:var(--shadow);cursor:pointer}

/* Print */
@media print{
    .tabs, .controls, .top{display:none !important}
    details.session{border:1px solid #bbb; page-break-inside: avoid;}
    details.session[open] > summary, details.session > summary{background:#f0f0f0; -webkit-print-color-adjust: exact; print-color-adjust: exact;}
    details.session{display:block}
    details.session > summary{cursor:default}
    details.session[open] .talks, .talks{display:block}
}

/* === Day heading with Prev/Next arrows === */
.day-heading{
  display:flex;
  align-items:center;
  gap:8px;
  margin:28px 0 10px;
  scroll-margin-top:74px;   /* keeps anchor visible under sticky nav */
}
.day-heading .day-label{
  flex:1;
  font-weight:700;
}

.day-arrow{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:32px; height:32px;
  border:1px solid var(--border);
  border-radius:999px;
  text-decoration:none;
  color:var(--sub, #475569);
  background:var(--card, #fff);
  box-shadow:var(--shadow, 0 1px 2px rgba(0,0,0,.05));
  line-height:1;
  font-size:18px;
}
.day-arrow:hover{
  color:var(--brand, #1d4ed8);
  border-color:var(--brand, #1d4ed8);
}
.day-arrow[aria-disabled="true"]{
  opacity:.35;
  pointer-events:none;
}

@media (max-width:560px){
  .day-arrow{ width:28px; height:28px; }
}

@media print{
  .day-arrow{ display:none !important; }
}

/* ===== Non-technical colour tokens ===== */
:root{
  /* Light mode tints */
  --break-bg:  #fff7ed; /* soft amber 50 */
  --social-bg: #f5f3ff; /* soft violet 50 */
  --admin-bg:  #f1f5f9; /* slate 50 */
  --nt-text:   inherit; /* text colour for non-tech blocks */
}
@media (prefers-color-scheme: dark){
  :root{
    /* Dark mode subtle raised tiles */
    --break-bg:  #3a2a12; /* warm amber-ish */
    --social-bg: #2b2340; /* muted violet */
    --admin-bg:  #152033; /* slate-ish */
    --nt-text:   #e5e7eb;
  }
}

/* ===== Overview — you already have the compact style; add highlights when non-technical ===== */

.slot.kind-break,
.slot.kind-social,
.slot.kind-admin{
  background: var(--break-bg);      /* default; overridden below */
  /* border-radius:10px; */
  /*padding:6px 8px; */                 /* tiny padding to make the highlight feel intentional */
  /*border:1px solid var(--border);*/
}
.slot.kind-social{ background: var(--social-bg); }
.slot.kind-admin{  background: var(--admin-bg);  }
.slot.kind-break + .slot.kind-break{ border-top:0; } /* avoid double borders on consecutive breaks */

/* ===== Sessions (Detailed Program) ===== */
/* Colour only the summary bar (sessions themselves), since talks are usually technical. */
.session.kind-break   > .session-header{ background: var(--break-bg); color: var(--nt-text); }
.session.kind-social  > .session-header{ background: var(--social-bg); color: var(--nt-text); }
.session.kind-admin   > .session-header{ background: var(--admin-bg);  color: var(--nt-text); }

/* Optional: if you ever tag a whole session as non-technical, soften its container border */
.session.kind-break,
.session.kind-social,
.session.kind-admin{
  border-color: var(--border);
}

.session {
    scroll-margin-top:74px;   /* keeps anchor visible under sticky nav */
}

/* Make title + icon align nicely */
.talk-title{
  display: inline-flex;           /* or flex; both fine here */
  align-items: center;
  gap: 6px;
}

/* DOI icon button */
.talk-title .doi{
  line-height: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px; height: 20px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--brand);            /* icon uses currentColor */
  background: var(--card);
  text-decoration: none;
  opacity: .85;
}
.talk-title .doi:hover{
  opacity: 1;
  border-color: var(--brand);
}
.talk-title .doi svg{
  width: 16px; height: 16px;
}

@media print {
  .talk-title .doi{ display:none !important; }  /* optional for cleaner print */
}

/* ===== Talk Abstract (details/summary) ===== */

/* Target either <details class="talk-abstract">… or <div class="talk-abstract"><details>… */
details.talk-abstract,
.talk-abstract > details{
  background: var(--muted);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-top: 8px;
  box-shadow: none;
}

/* Summary (the clickable bar) */
details.talk-abstract > summary,
.talk-abstract > details > summary{
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--subtext);
}

/* === Talk Abstracts — ultra-compact when closed === */

/* Support either <details class="talk-abstract">… or <div class="talk-abstract"><details>… */
details.talk-abstract,
.talk-abstract > details{
  margin: 4px 0 0;
  border: 0;
  background: transparent;
}

/* Closed state: make the summary look like a small link */
details.talk-abstract > summary,
.talk-abstract > details > summary{
  all: unset;                        /* nuke default summary styles */
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  /* color: var(--brand); */
  font-weight: 600;
  font-size: 0.92rem;
  line-height: 1.2;
}
details.talk-abstract > summary:hover,
.talk-abstract > details > summary:hover{
  text-decoration: underline;
}

/* Hide native marker; use a tiny chevron */
details.talk-abstract > summary::-webkit-details-marker,
.talk-abstract > details > summary::-webkit-details-marker{ display: none; }
details.talk-abstract > summary::before,
.talk-abstract > details > summary::before{
  content: "▸";
  font-size: 0.9rem;
  line-height: 1;
  opacity: .75;
  transition: transform .18s ease, opacity .18s ease;
}

/* Open state: turn into a small card */
details.talk-abstract[open] > summary,
.talk-abstract > details[open] > summary{
  padding: 6px 8px;
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom: 0;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
  box-shadow: var(--shadow);
  text-decoration: none;            /* remove hover underline once open */
}
details.talk-abstract[open] > summary::before,
.talk-abstract > details[open] > summary::before{
  transform: rotate(90deg);
  opacity: 1;
}

/* Abstract body */
details.talk-abstract > *:not(summary),
.talk-abstract > details > *:not(summary){
  padding: 10px 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-top: 0;
  border-bottom-left-radius: 10px;
  border-bottom-right-radius: 10px;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Accessibility */
details.talk-abstract > summary:focus-visible,
.talk-abstract > details > summary:focus-visible{
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 6px;
}

/* Print: show content cleanly, no chevron */
@media print{
  details.talk-abstract > summary::before,
  .talk-abstract > details > summary::before{ content: ""; }
}

/* Left column now stacks time + flag vertically */
.talk-time{
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;                /* space between time and flag */
}

/* Flag styling */
.talk-flag{
  font-size: 0.62rem;
  line-height: 1;
  letter-spacing: .04em;
  text-transform: uppercase;
  font-weight: 700;
  padding: 2px 3px;
  border-radius: 999px;

  /* colours that fit the existing palette */
  color: #0f172a;                           /* dark text in light mode */
  background: #e0ecff;                      /* soft brand-tinted pill */
  border: 1px solid rgba(29,78,216,0.25);   /* subtle brand border */
}

/* If your left column is narrow, prevent awkward wrapping */
@media (max-width:560px){
  .talk-flag{ font-size: 0.7rem; }
}

/* Apply to the existing flag */
.talk-flag{
  color: var(--flag-text);
  background: var(--flag-bg);
  border: 1px solid var(--flag-border);
}

/* Optional: subtle hover/focus lift (keeps the red feel) */
.talk-flag:hover,
.talk-flag:focus-visible{
  filter: brightness(0.98);
  box-shadow: 0 0 0 2px color-mix(in oklab, var(--flag-border), transparent 60%);
}

.talk-flag.is-award    { --flag-bg:    #fee2e2;        /* soft red 200 */
  --flag-border:#fca5a5;        /* red 300 */
  --flag-text:  #7f1d1d;        /* red 900 */
}

.talk-note{
  margin-top:4px;
  font-size:0.9rem;
  color:var(--subtext);
  font-style:italic;
  font-weight:700
}