/* ── Variables ─────────────────────────────────────────── */
:root {
  --navy:   #1D2B4F;
  --crimson:#8B1A4A;
  --mauve:  #C4A8C0;
  --cream:  #F5F0E8;
  --white:  #ffffff;
  --grey:   #e8e8e8;
  --text:   #1a1a2e;
  --muted:  #666;
  --radius: 8px;
  --shadow-sm: 0 1px 4px rgba(0,0,0,.08);
  --shadow:    0 2px 10px rgba(0,0,0,.12);
}

/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
body {
  font-family: 'Atkinson Hyperlegible', system-ui, sans-serif;
  background: #f0ece3;
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
sup { font-size: .7em; vertical-align: super; }
a { color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul { list-style: none; }

/* ── Banner image ──────────────────────────────────────── */
.site-banner-wrap {
  background: var(--cream);
  border-bottom: 3px solid var(--crimson);
  line-height: 0;
}

.site-banner-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

/* ── Site header (nav only, sticky) ───────────────────── */
.site-header {
  background: var(--navy);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
}

/* ── Nav bar ───────────────────────────────────────────── */
.nav-bar {
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
  background: var(--navy);
  border-top: 1px solid rgba(255,255,255,.08);
}
.nav-bar::-webkit-scrollbar { display: none; }

.nav-btn {
  color: rgba(245,240,232,.7);
  padding: .75rem 1.125rem;
  font-size: .8125rem;
  font-weight: 700;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  transition: color .2s, border-color .2s;
  flex-shrink: 0;
}
.nav-btn:hover { color: var(--cream); }
.nav-btn.active {
  color: var(--white);
  border-bottom-color: var(--crimson);
}

/* ── Layout ────────────────────────────────────────────── */
.section { display: none; padding: 1.25rem .875rem 3rem; }
.section.active { display: block; }
.container { max-width: 900px; margin: 0 auto; }

/* ── ACCUEIL ───────────────────────────────────────────── */
.accueil-card {
  background: var(--navy);
  color: var(--cream);
  border-radius: var(--radius);
  padding: 2rem 1.5rem 2rem;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
}

.accueil-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 120px; height: 120px;
  background: radial-gradient(circle at top right, rgba(139,26,74,.35) 0%, transparent 70%);
  pointer-events: none;
}

.accueil-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1rem;
}

.accueil-tag {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--mauve);
  background: rgba(196,168,192,.12);
  padding: .2rem .6rem;
  border-radius: 4px;
}

.accueil-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
  margin-bottom: .375rem;
}

.accueil-subtitle {
  color: var(--crimson);
  font-size: 1rem;
  margin-bottom: 1.25rem;
}

.accueil-welcome {
  font-size: .875rem;
  color: rgba(245,240,232,.85);
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

/* ── Buttons ───────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: var(--crimson);
  color: var(--white);
  padding: .875rem 1.75rem;
  border-radius: var(--radius);
  font-size: .9375rem;
  font-weight: 700;
  text-decoration: none;
  transition: background .2s, transform .1s;
  cursor: pointer;
}
.btn-primary:hover  { background: #6d1238; }
.btn-primary:active { transform: scale(.98); }

/* ── PROGRAMME ─────────────────────────────────────────── */
.day-tabs {
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 2px solid var(--mauve);
  margin-bottom: 1rem;
  gap: 0;
}
.day-tabs::-webkit-scrollbar { display: none; }

.day-tab {
  padding: .65rem 1rem;
  font-size: .8125rem;
  font-weight: 700;
  color: var(--navy);
  white-space: nowrap;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: border-color .2s, color .2s;
  flex-shrink: 0;
}
.day-tab:hover { color: var(--crimson); }
.day-tab.active {
  color: var(--crimson);
  border-bottom-color: var(--crimson);
}

.day-content { display: none; }
.day-content.active { display: block; }

/* ── Time blocks ───────────────────────────────────────── */
.time-block { margin-bottom: .75rem; }

.time-label {
  font-size: .6875rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--navy);
  opacity: .55;
  padding: .5rem 0 .35rem;
  border-top: 1px solid var(--mauve);
  margin-bottom: .4rem;
}

/* ── Session cards ─────────────────────────────────────── */
.session-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: .8rem .95rem;
  margin-bottom: .4rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,.05);
  transition: box-shadow .18s, transform .12s;
}
.session-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}

.session-card.social-card {
  background: var(--cream);
  border: 1px dashed var(--mauve);
  box-shadow: none;
}
.session-card.social-card:hover {
  box-shadow: var(--shadow-sm);
  transform: none;
}
.session-card.pause-card {
  background: var(--grey-light, #f0f0f0);
  border: none;
  box-shadow: none;
  opacity: .75;
  cursor: default;
  pointer-events: none;
  text-align: center;
  padding: .4rem 1rem;
}
.session-card.pause-card .card-title {
  font-size: .85rem;
  font-weight: 400;
  color: var(--charcoal);
}

.card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
  margin-bottom: .35rem;
}

/* ── Badges ────────────────────────────────────────────── */
.badge {
  display: inline-block;
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: .2rem .55rem;
  border-radius: 4px;
  line-height: 1.4;
}
.badge-pleniere     { background: var(--crimson); color: var(--cream); }
.badge-panel        { background: var(--navy);    color: var(--cream); }
.badge-atelier      { background: var(--mauve);   color: var(--navy);  }
.badge-communication{ background: var(--grey);    color: var(--navy);  }
.badge-table-ronde  { background: var(--cream);   color: var(--crimson); border: 1px solid var(--mauve); }
.badge-social       { background: #f0ece3;         color: #888; border: 1px solid #d8d4cb; }

.card-meta {
  font-size: .7rem;
  color: var(--muted);
  white-space: nowrap;
}

.card-title {
  font-size: .875rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.35;
  margin-bottom: .25rem;
}

.card-authors {
  font-size: .8rem;
  color: #555;
  font-style: italic;
  line-height: 1.4;
}

.card-subtitle {
  font-size: .75rem;
  color: var(--crimson);
  font-style: italic;
  line-height: 1.4;
  margin-top: .15rem;
}

/* ── Star button ───────────────────────────────────────── */
.star-btn {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 1rem;
  line-height: 1;
  padding: .1rem .25rem;
  color: #ccc;
  transition: color .15s, transform .1s;
}
.star-btn:hover  { color: #e8a020; transform: scale(1.2); }
.star-btn.starred { color: #e8a020; }

/* ── Columns grid ──────────────────────────────────────── */
.columns-grid {
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  padding-bottom: .25rem;
  scrollbar-width: thin;
  scrollbar-color: var(--mauve) transparent;
  align-items: flex-start;
}
.columns-grid::-webkit-scrollbar { height: 4px; }
.columns-grid::-webkit-scrollbar-track { background: transparent; }
.columns-grid::-webkit-scrollbar-thumb { background: var(--mauve); border-radius: 2px; }

.column-room {
  flex: 1 1 180px;
  min-width: 180px;
}

.room-header {
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--cream);
  background: var(--navy);
  padding: .3rem .6rem;
  border-radius: 4px 4px 0 0;
  margin-bottom: .25rem;
}

/* ── Loading ───────────────────────────────────────────── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .875rem;
  padding: 4rem 1rem;
  color: var(--muted);
  font-size: .9rem;
}

.loading-spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--mauve);
  border-top-color: var(--crimson);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-msg {
  padding: 2rem 1rem;
  text-align: center;
  color: var(--crimson);
  font-size: .9rem;
  background: #fff5f7;
  border-radius: var(--radius);
  border: 1px solid #f5c0cc;
}

/* ── Modal ─────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 500;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  backdrop-filter: blur(2px);
}
.modal-overlay[hidden] { display: none; }

.modal-content {
  background: var(--white);
  border-radius: var(--radius) var(--radius) 0 0;
  width: 100%;
  max-width: 660px;
  max-height: 88vh;
  overflow-y: auto;
  padding: 1.5rem 1.25rem 2rem;
  position: relative;
  animation: slideUp .22s ease-out;
}
@keyframes slideUp {
  from { transform: translateY(24px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: var(--muted);
  font-size: 1.125rem;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background .15s, color .15s;
}
.modal-close:hover { background: var(--grey); color: var(--navy); }

.modal-badge { margin-bottom: .75rem; }

.modal-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.4;
  padding-right: 2rem;
  margin-bottom: .5rem;
}

.modal-meta {
  font-size: .8rem;
  color: var(--muted);
  margin-bottom: .75rem;
}

.modal-authors {
  font-size: .875rem;
  font-style: italic;
  color: var(--navy);
  margin-bottom: 1.125rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--grey);
}

.modal-abstract {
  font-size: .875rem;
  line-height: 1.7;
  color: #333;
}

.modal-abstract p + p { margin-top: .75rem; }

.modal-poster-list {
  list-style: none;
  margin-top: .5rem;
}
.modal-poster-list li {
  padding: .4rem 0;
  border-bottom: 1px solid var(--grey);
  font-size: .9rem;
  color: var(--navy);
}
.modal-poster-list li:last-child { border-bottom: none; }

/* ── INFOS PRATIQUES ───────────────────────────────────── */
.info-block { margin-bottom: 1.75rem; }

.info-heading {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--crimson);
  margin-bottom: .625rem;
  padding-bottom: .375rem;
  border-bottom: 2px solid var(--mauve);
}

.info-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.125rem 1.25rem;
  box-shadow: var(--shadow-sm);
}

.info-card-highlight {
  background: var(--navy);
  color: var(--cream);
}

.info-address {
  font-size: .9rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .625rem;
}

.map-link {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  font-size: .8125rem;
  color: var(--crimson);
  font-weight: 700;
  text-decoration: none;
  transition: opacity .15s;
}
.map-link:hover { opacity: .75; }

.info-subhead {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--navy);
  margin-bottom: .4rem;
}

.info-card ul { padding-left: 1rem; }
.info-card li {
  font-size: .875rem;
  color: #444;
  padding: .2rem 0;
  list-style: disc;
}

.info-event-date {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--mauve);
  margin-bottom: .35rem;
}
.info-event-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: .25rem;
}
.info-event-address {
  font-size: .875rem;
  color: rgba(245,240,232,.8);
}

.contact-link {
  font-size: .9rem;
  color: var(--crimson);
  font-weight: 700;
  text-decoration: none;
  word-break: break-all;
}
.contact-link:hover { text-decoration: underline; }

/* ── Weather widget ────────────────────────────────────── */
.weather-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: .5rem;
}

.weather-day {
  text-align: center;
  padding: .625rem .25rem;
  background: #f8f6f0;
  border-radius: var(--radius);
}

.weather-day-label {
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--navy);
  margin-bottom: .25rem;
}

.weather-icon { font-size: 1.5rem; line-height: 1; margin-bottom: .25rem; }

.weather-temp {
  font-size: .8rem;
  font-weight: 700;
  color: var(--navy);
}

.weather-temp-min { color: var(--muted); font-weight: 400; }

.weather-desc {
  font-size: .65rem;
  color: var(--muted);
  margin-top: .2rem;
  line-height: 1.3;
}

/* ── LIVRET ────────────────────────────────────────────── */
.livret-header {
  text-align: center;
  padding: 2rem 1rem 1.75rem;
  border-bottom: 2px solid var(--mauve);
  margin-bottom: 1.75rem;
}

.livret-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .875rem;
}

.livret-desc {
  font-size: .9rem;
  color: #555;
  line-height: 1.7;
  max-width: 520px;
  margin: 0 auto 1.75rem;
}

/* ── Abstracts search & filter ─────────────────────────── */
.abstracts-controls {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  margin-bottom: 1.25rem;
}

.abstracts-search {
  width: 100%;
  padding: .65rem 1rem;
  font-family: inherit;
  font-size: .9rem;
  color: var(--text);
  background: var(--white);
  border: 1.5px solid var(--grey);
  border-radius: var(--radius);
  outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.abstracts-search:focus {
  border-color: var(--crimson);
  box-shadow: 0 0 0 3px rgba(139,26,74,.12);
}
.abstracts-search::placeholder { color: #aaa; }

.abstracts-filters {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}

.filter-btn {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: .3rem .75rem;
  border-radius: 4px;
  border: 1.5px solid var(--mauve);
  color: var(--navy);
  background: var(--white);
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.filter-btn:hover { border-color: var(--crimson); color: var(--crimson); }
.filter-btn.active {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--cream);
}

.abstracts-count {
  font-size: .75rem;
  color: var(--muted);
  margin-bottom: .75rem;
  font-style: italic;
}

/* ── Abstract cards ────────────────────────────────────── */
.abstract-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid rgba(0,0,0,.06);
  box-shadow: var(--shadow-sm);
  margin-bottom: .5rem;
  overflow: hidden;
  transition: box-shadow .18s;
}
.abstract-card:hover { box-shadow: var(--shadow); }

.abstract-card-header {
  display: flex;
  align-items: flex-start;
  gap: .625rem;
  padding: .875rem 1rem;
  cursor: pointer;
  user-select: none;
}

.abstract-card-info { flex: 1; min-width: 0; }

.abstract-card-title {
  font-size: .875rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.35;
  margin-bottom: .25rem;
}

.abstract-card-authors {
  font-size: .8rem;
  color: #555;
  font-style: italic;
  line-height: 1.4;
}

.author-affil {
  font-style: normal;
  color: var(--muted);
  font-size: .75em;
}

.abstract-card-date {
  font-size: .7rem;
  color: var(--muted);
  margin-top: .2rem;
}

.abstract-chevron {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: .75rem;
  transition: transform .2s;
  margin-top: .1rem;
}
.abstract-card.open .abstract-chevron { transform: rotate(180deg); }

.abstract-card-body {
  display: none;
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--grey);
}
.abstract-card.open .abstract-card-body { display: block; }

.abstract-text {
  font-size: .875rem;
  line-height: 1.75;
  color: #333;
  margin-top: .875rem;
}
.abstract-text p + p { margin-top: .625rem; }

.abstract-keywords {
  font-size: .78rem;
  color: var(--muted);
  margin-top: .75rem;
  padding-top: .625rem;
  border-top: 1px solid var(--grey);
  font-style: italic;
}
.abstract-keywords strong {
  color: var(--navy);
  font-style: normal;
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.abstract-refs {
  margin-top: .75rem;
  padding-top: .625rem;
  border-top: 1px solid var(--grey);
  font-size: .78rem;
  color: var(--muted);
}
.abstract-refs strong {
  display: block;
  color: var(--navy);
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: .35rem;
}
.abstract-refs ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: .3rem;
}
.abstract-refs li {
  line-height: 1.5;
}

/* Panel sub-communications inside an abstract card */
.panel-comms-list {
  margin-top: .875rem;
  display: flex;
  flex-direction: column;
  gap: .625rem;
}
.panel-comm-item {
  padding: .75rem;
  background: #f8f6f2;
  border-radius: 6px;
  border-left: 3px solid var(--mauve);
}
.panel-comm-title {
  font-size: .825rem;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: .2rem;
}
.panel-comm-authors {
  font-size: .78rem;
  color: #555;
  font-style: italic;
  margin-bottom: .5rem;
}
.panel-comm-abstract {
  font-size: .8rem;
  line-height: 1.65;
  color: #444;
}

.abstracts-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
  font-size: .9rem;
  font-style: italic;
}

/* ── Responsive ────────────────────────────────────────── */
@media (min-width: 600px) {
  .modal-content {
    border-radius: var(--radius);
    margin: auto;
    max-height: 80vh;
  }
  .modal-overlay {
    align-items: center;
    padding: 1.5rem;
  }
  .accueil-title { font-size: 1.5rem; }
  .header-title  { font-size: 1.25rem; }
  .section { padding: 1.5rem 1.25rem 3rem; }
}

@media (min-width: 900px) {
  .nav-btn { padding: .875rem 1.5rem; font-size: .875rem; }
  .day-tab { font-size: .875rem; padding: .75rem 1.25rem; }
}