/* =========================================================
   Seminários de Ciência de Dados & IA — IME-USP
   Visual system derived from the printed flyer.
   Neo-grotesque type, black on white, thin rules.
   ========================================================= */

:root{
  --bg:        #ffffff;
  --ink:       #111111;
  --ink-soft:  #1c1c1c;
  --body:      #232323;
  --gray:      #8a8a8a;   /* tracked labels */
  --gray-2:    #6f6f6f;   /* secondary text */
  --gray-3:    #b4b4b4;   /* placeholder / muted */
  --rule:      #dcdcdc;   /* thin hairlines */
  --rule-2:    #c4c4c4;
  --ink-bar:   #111111;   /* thick top bar */
  --maxw:      1180px;
  --pad:       40px;
  --font: "Helvetica Neue", Helvetica, Arial, "Liberation Sans", "Nimbus Sans", sans-serif;
}

*{ box-sizing:border-box; }

html{ -webkit-text-size-adjust:100%; }

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font);
  font-weight:400;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img{ display:block; max-width:100%; }

.wrap{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 var(--pad);
}

/* ---- shared label style (DATA, HORÁRIO, RESUMO…) ---- */
.label{
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gray);
}

/* =========================================================
   UTILITY ROW + LANGUAGE SWITCH
   ========================================================= */
.utility{
  display:flex;
  justify-content:flex-end;
  align-items:center;
  padding:14px 0 10px;
}
.lang{
  display:flex;
  align-items:center;
  gap:9px;
  font-size:12px;
  letter-spacing:.14em;
  font-weight:700;
  text-transform:uppercase;
}
.lang a{
  color:var(--gray-3);
  text-decoration:none;
  transition:color .15s ease;
}
.lang a:hover{ color:var(--ink); }
.lang .sep{ color:var(--rule-2); font-weight:400; }
.lang .is-active{ color:var(--ink); }

/* =========================================================
   MASTHEAD  (= flyer header)
   ========================================================= */
.topbar{
  height:7px;
  background:var(--ink-bar);
}
.masthead{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:28px;
  padding:22px 0 20px;
  border-bottom:1px solid var(--ink);
}
.brand{
  display:flex;
  align-items:center;
  gap:18px;
}
.brand img{
  width:auto;
  height:88px;
}
.brand .inst{
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.045em;
  line-height:1.45;
  text-transform:uppercase;
  color:var(--ink-soft);
  max-width:300px;
}
.masthead .series{
  font-size:14px;
  font-weight:700;
  letter-spacing:.07em;
  text-transform:uppercase;
  text-align:right;
  color:var(--ink);
  padding-top:6px;
  white-space:nowrap;
}

/* =========================================================
   MANIFESTO
   ========================================================= */
.manifesto{
  padding:66px 0 60px;
  border-bottom:1px solid var(--rule);
}
.manifesto .label{ margin-bottom:22px; }
.manifesto p{
  margin:0 0 1em;
  max-width:780px;
  font-size:clamp(20px, 2.1vw, 26px);
  line-height:1.5;
  letter-spacing:-0.005em;
  color:var(--ink);
  font-weight:400;
  text-wrap:pretty;
}
.manifesto p:last-child{ margin-bottom:0; }
.manifesto p .em{ font-weight:700; }

/* =========================================================
   SERIES / CAROUSEL
   ========================================================= */
.series{ padding:54px 0 70px; }
.series-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  margin-bottom:26px;
}
.series-head .count{
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gray-3);
}

.carousel-shell{ position:relative; }

.carousel{
  display:flex;
  gap:26px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  padding:6px 2px 26px;
  scroll-padding-left:2px;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
  scrollbar-color:var(--rule-2) transparent;
}
.carousel::-webkit-scrollbar{ height:7px; }
.carousel::-webkit-scrollbar-thumb{ background:var(--rule-2); border-radius:4px; }
.carousel::-webkit-scrollbar-track{ background:transparent; }

/* ---- card ---- */
.card{
  scroll-snap-align:start;
  flex:0 0 372px;
  width:372px;
  background:var(--bg);
  border:1px solid var(--ink);
  padding:26px 26px 24px;
  display:flex;
  flex-direction:column;
  cursor:pointer;
  transition:transform .22s ease, box-shadow .22s ease;
  position:relative;
}
.card:hover{
  transform:translateY(-4px);
  box-shadow:0 18px 40px -22px rgba(0,0,0,.45);
}
.card:focus-visible{ outline:2px solid var(--ink); outline-offset:3px; }
.card.is-previous::after{
  content:"";
  position:absolute;
  inset:0;
  background:rgba(255,255,255,.62);
  pointer-events:none;
  transition:opacity .18s ease;
}
.card.is-previous:hover::after,
.card.is-previous:focus-visible::after{ opacity:.38; }

.card-meta{
  display:flex;
  align-items:center;
  gap:14px;
  font-size:12.5px;
  font-weight:500;
  color:var(--ink);
  padding-bottom:16px;
  border-bottom:1px solid var(--rule);
}
.card-meta .dot{ color:var(--rule-2); }
.card-meta .m-time{ color:var(--gray-2); }

.card-title{
  font-size:27px;
  font-weight:700;
  line-height:1.06;
  letter-spacing:-0.02em;
  margin:20px 0 0;
  color:var(--ink);
  text-wrap:balance;
  flex:0 0 auto;
  min-height:118px;
}
.card-subtitle{
  font-size:15px;
  font-weight:600;
  line-height:1.28;
  letter-spacing:0;
  color:var(--gray-2);
  margin:12px 0 0;
  text-wrap:balance;
}

.card-tags{
  display:flex;
  flex-wrap:wrap;
  gap:6px 0;
  margin:20px 0 22px;
}
.card-tags span{
  font-size:9.5px;
  font-weight:700;
  letter-spacing:.11em;
  text-transform:uppercase;
  color:var(--gray-2);
  padding:0 11px;
  border-left:1px solid var(--rule-2);
  line-height:1.1;
}
.card-tags span:first-child{ padding-left:0; border-left:none; }

.card-foot{
  margin-top:auto;
  padding-top:20px;
  border-top:1px solid var(--rule);
  display:flex;
  align-items:center;
  gap:15px;
}
.card-foot img{
  width:58px;
  height:58px;
  object-fit:cover;
  flex:0 0 auto;
}
.card-foot .s-name{
  font-size:17px;
  font-weight:700;
  letter-spacing:-0.01em;
  line-height:1.15;
  color:var(--ink);
}
.card-foot .s-role{
  font-size:11.5px;
  color:var(--gray-2);
  line-height:1.3;
  margin-top:3px;
}
.card-foot .s-label{
  font-size:9px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gray-3);
  margin-bottom:5px;
}

.card-cue{
  margin-top:20px;
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink);
  display:flex;
  align-items:center;
  gap:8px;
}
.card-cue .arw{ transition:transform .2s ease; }
.card:hover .card-cue .arw{ transform:translateX(5px); }

.card-video-link{
  position:relative;
  z-index:1;
  margin-top:18px;
  min-height:38px;
  border:1px solid var(--ink);
  background:var(--ink);
  color:var(--bg);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  align-self:flex-start;
  font-size:10px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  text-decoration:none;
  padding:10px 13px;
  transition:background .15s ease, color .15s ease;
}
.card-video-link:hover,
.card-video-link:focus-visible{
  background:var(--bg);
  color:var(--ink);
}
.card-video-link:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:3px;
}

/* ---- TBA card ---- */
.card.tba{
  border:1px dashed var(--rule-2);
  cursor:default;
}
.card.tba:hover{ transform:none; box-shadow:none; }
.card.tba .card-title{ color:var(--gray-3); font-weight:700; }
.card.tba .card-meta{ color:var(--gray-3); }
.card.tba .tba-note{
  margin-top:auto;
  padding-top:20px;
  border-top:1px solid var(--rule);
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--gray-3);
}

/* ---- carousel arrows ---- */
.car-nav{
  position:absolute;
  top:-58px;
  right:0;
  display:flex;
  gap:8px;
}
.car-nav button{
  width:40px;
  height:40px;
  border:1px solid var(--ink);
  background:var(--bg);
  color:var(--ink);
  cursor:pointer;
  font-size:16px;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:background .15s ease, color .15s ease, opacity .15s ease;
}
.car-nav button:hover{ background:var(--ink); color:var(--bg); }
.car-nav button:disabled{ opacity:.28; cursor:default; background:var(--bg); color:var(--ink); }
.carousel-shell.is-static .car-nav{ display:none; }

/* ---- below-cards row: contact (left) + support (right) ---- */
.below-cards{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:32px 48px;
  margin-top:40px;
  flex-wrap:wrap;
}
.contact .label{ margin-bottom:15px; }
.contact-list{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:7px;
}
.contact-list a{
  font-size:16px;
  color:var(--ink);
  text-decoration:none;
  border-bottom:1px solid var(--rule-2);
  padding-bottom:1px;
  transition:border-color .15s ease, color .15s ease;
}
.contact-list a:hover{ border-color:var(--ink); }

.visually-hidden{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}

.mailing{
  flex:1 1 360px;
  max-width:430px;
}
.mailing .label{ margin-bottom:15px; }
.mailing-link:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:3px;
}
.mailing-link{
  min-height:42px;
  border:1px solid var(--ink);
  background:var(--ink);
  color:var(--bg);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  text-decoration:none;
  padding:12px 16px;
  margin:10px 0 8px;
  transition:opacity .15s ease, background .15s ease, color .15s ease;
}
.mailing-link:hover{ background:var(--bg); color:var(--ink); }
.mailing-note,
.mailing-status{
  margin:0;
  font-size:12px;
  line-height:1.45;
  color:var(--gray-2);
}
.mailing-status{ color:var(--gray-2); }

/* ---- support credit (below cards, discreet, right) ---- */
.support-credit{
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  gap:9px;
}
.support-credit .label{ color:var(--gray-3); }
.support-credit a{
  display:inline-block;
  opacity:.8;
  transition:opacity .15s ease;
}
.support-credit a:hover{ opacity:1; }
.support-credit img{ height:56px; width:auto; }

/* =========================================================
   PAGE FOOTER
   ========================================================= */
.page-foot{
  border-top:1px solid var(--ink);
  padding:22px 0 48px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:20px;
  font-size:11px;
  font-weight:700;
  letter-spacing:.13em;
  text-transform:uppercase;
  color:var(--gray-2);
}
.page-foot .pf-right{ color:var(--ink); text-align:right; }

/* =========================================================
   OVERLAY (expanded card = flyer body)
   ========================================================= */
.overlay{
  position:fixed;
  inset:0;
  z-index:80;
  display:none;
  align-items:flex-start;
  justify-content:center;
  background:rgba(20,20,20,.46);
  backdrop-filter:blur(3px);
  -webkit-backdrop-filter:blur(3px);
  overflow-y:auto;
  padding:48px 24px 64px;
}
.overlay.open{ display:flex; animation:ovfade .2s ease; }
@keyframes ovfade{ from{ opacity:0; } to{ opacity:1; } }

.detail{
  position:relative;
  width:100%;
  max-width:1040px;
  background:var(--bg);
  padding:54px clamp(28px,5vw,72px) 48px;
  box-shadow:0 40px 100px -30px rgba(0,0,0,.55);
  animation:ovpop .26s cubic-bezier(.2,.7,.3,1);
}
@keyframes ovpop{ from{ opacity:0; transform:translateY(18px) scale(.985); } to{ opacity:1; transform:none; } }

.detail-close{
  position:absolute;
  top:22px;
  right:22px;
  width:42px;
  height:42px;
  border:1px solid var(--ink);
  background:var(--bg);
  color:var(--ink);
  font-size:18px;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:background .15s ease, color .15s ease;
  z-index:2;
}
.detail-close:hover{ background:var(--ink); color:var(--bg); }

/* meta row */
.detail-meta{
  display:grid;
  grid-template-columns:1fr 1fr 1.3fr;
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--ink);
}
.detail-meta .dm{
  padding:16px 26px 18px 0;
  border-left:1px solid var(--rule);
  padding-left:26px;
}
.detail-meta .dm:first-child{ border-left:none; padding-left:0; }
.detail-meta .dm .label{ margin-bottom:8px; }
.detail-meta .dm .v{
  font-size:18px;
  font-weight:500;
  color:var(--ink);
  letter-spacing:-0.01em;
}

/* title */
.detail-title{
  font-size:clamp(40px, 5.4vw, 68px);
  font-weight:700;
  line-height:1.0;
  letter-spacing:-0.025em;
  margin:42px 0 38px;
  color:var(--ink);
  text-wrap:balance;
}
.detail-subtitle{
  max-width:760px;
  font-size:clamp(22px, 2.6vw, 32px);
  font-weight:600;
  line-height:1.16;
  letter-spacing:0;
  color:var(--gray-2);
  margin:-24px 0 36px;
  text-wrap:balance;
}

/* tags */
.detail-tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px 0;
  padding:18px 0;
  border-top:1px solid var(--rule);
  border-bottom:1px solid var(--rule);
}
.detail-tags span{
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink);
  padding:0 26px;
  border-left:1px solid var(--rule-2);
}
.detail-tags span:first-child{ padding-left:0; border-left:none; }

.detail-recording{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:22px 0;
  border-bottom:1px solid var(--rule);
}
.detail-recording p{
  margin:8px 0 0;
  font-size:15px;
  color:var(--gray-2);
  line-height:1.5;
}
.detail-video-link{
  flex:0 0 auto;
  min-height:42px;
  border:1px solid var(--ink);
  background:var(--ink);
  color:var(--bg);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  text-decoration:none;
  padding:12px 16px;
  transition:background .15s ease, color .15s ease;
}
.detail-video-link:hover,
.detail-video-link:focus-visible{
  background:var(--bg);
  color:var(--ink);
}
.detail-video-link:focus-visible{
  outline:2px solid var(--ink);
  outline-offset:3px;
}

/* speaker block */
.detail-speaker{
  display:grid;
  grid-template-columns:1fr 300px;
  gap:48px;
  align-items:start;
  padding:46px 0 44px;
  border-bottom:1px solid var(--ink);
}
.detail-speaker .sp-label{ margin-bottom:14px; }
.detail-speaker .sp-name{
  font-size:clamp(34px,4vw,50px);
  font-weight:700;
  letter-spacing:-0.02em;
  line-height:1;
  margin:0 0 18px;
  color:var(--ink);
}
.detail-speaker .sp-role{
  font-size:17px;
  line-height:1.5;
  color:var(--gray-2);
  max-width:440px;
  margin:0 0 16px;
}
.detail-speaker .sp-prev{
  font-size:16px;
  line-height:1.55;
  color:var(--ink);
  max-width:420px;
}
.detail-speaker .sp-prev strong{ font-weight:700; }
.detail-speaker img{
  width:300px;
  height:300px;
  object-fit:cover;
}

/* body two columns */
.detail-body{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  padding:42px 0 8px;
}
.detail-body h3{
  font-size:12px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink);
  margin:0 0 20px;
}
.detail-body p{
  font-size:17px;
  line-height:1.62;
  color:var(--body);
  margin:0 0 1.1em;
  text-wrap:pretty;
}
.detail-body p:last-child{ margin-bottom:0; }

/* footer block */
.detail-foot{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  margin-top:44px;
  padding-top:26px;
  border-top:1px solid var(--ink);
}
.detail-foot .ff .label{ margin-bottom:12px; }
.detail-foot .ff .ff-strong{
  font-size:21px;
  font-weight:700;
  letter-spacing:-0.01em;
  color:var(--ink);
  line-height:1.25;
}
.detail-foot .ff .ff-sub{
  font-size:14.5px;
  color:var(--gray-2);
  margin-top:6px;
}

.detail-apoio{
  display:flex;
  align-items:center;
  gap:18px;
  margin-top:34px;
  padding-top:22px;
  border-top:1px solid var(--rule);
}
.detail-apoio .label{ margin-bottom:0; }
.detail-apoio .ap-name{
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--ink);
}
.detail-apoio .ap-name span{ color:var(--gray-2); font-weight:500; }

/* =========================================================
   VIDEO WATCH PAGE
   ========================================================= */
.watch-page .masthead{ margin-bottom:0; }
.watch{
  padding:48px 0 70px;
}
.watch-back{
  color:var(--ink);
  display:inline-flex;
  align-items:center;
  font-size:11px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  text-decoration:none;
  border-bottom:1px solid var(--rule-2);
  padding-bottom:2px;
  margin-bottom:32px;
}
.watch-back:hover{ border-color:var(--ink); }
.watch-head{
  max-width:860px;
  margin-bottom:30px;
}
.watch-head .label{ margin-bottom:14px; }
.watch-head h1{
  margin:0 0 18px;
  font-size:clamp(34px, 5vw, 60px);
  line-height:1;
  letter-spacing:-0.025em;
  text-wrap:balance;
}
.watch-head p{
  margin:0;
  font-size:17px;
  color:var(--gray-2);
}
.video-shell{
  border-top:1px solid var(--ink);
  padding:24px 0 28px;
}
.video-shell video{
  width:100%;
  aspect-ratio:16/9;
  background:#000;
  display:block;
}
.caption-panel{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:20px;
  margin-top:18px;
  flex-wrap:wrap;
}
.caption-controls{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
}
.caption-controls button{
  min-height:38px;
  border:1px solid var(--ink);
  background:var(--bg);
  color:var(--ink);
  cursor:pointer;
  font-size:10px;
  font-weight:700;
  letter-spacing:.12em;
  text-transform:uppercase;
  padding:10px 13px;
  transition:background .15s ease, color .15s ease;
}
.caption-controls button:hover,
.caption-controls button[aria-pressed="true"]{
  background:var(--ink);
  color:var(--bg);
}
/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width:780px){
  :root{ --pad:22px; }
  .masthead{ flex-direction:column; gap:18px; }
  .masthead .series{ text-align:left; white-space:normal; }
  .detail-meta{ grid-template-columns:1fr; }
  .detail-meta .dm{ border-left:none; padding-left:0; border-top:1px solid var(--rule); }
  .detail-meta .dm:first-child{ border-top:none; }
  .detail-speaker{ grid-template-columns:1fr; gap:28px; }
  .detail-speaker img{ width:100%; height:auto; aspect-ratio:1/1; order:-1; max-width:340px; }
  .detail-body{ grid-template-columns:1fr; gap:32px; }
  .detail-foot{ grid-template-columns:1fr; gap:26px; }
  .detail{ padding:46px 22px 40px; }
  .detail-recording{ align-items:flex-start; flex-direction:column; }
  .car-nav{ display:none; }
  .mailing{ max-width:none; width:100%; }
  .support-credit{ align-items:flex-start; }
  .caption-panel{ align-items:flex-start; flex-direction:column; }
  .caption-controls{ width:100%; }
  .caption-controls button{ flex:1 1 150px; }
}

@media (prefers-reduced-motion: reduce){
  *{ animation:none !important; transition:none !important; }
}