*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { width: 100%; height: 100%; overflow: hidden; background: #040b18; }
body { font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif; color: #e8eaf6; }

/* ── Next slide hint ── */
#next-hint {
  position: fixed;
  bottom: 40px;
  right: 24px;
  z-index: 150;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: rgba(144, 202, 249, 0.5);
  letter-spacing: 0.03em;
  transition: color 0.3s, opacity 0.3s;
  cursor: pointer;
  user-select: none;
}
#next-hint:hover {
  color: rgba(144, 202, 249, 0.8);
}
.hint-icon {
  display: inline-block;
  font-size: 1.1rem;
  animation: slideArrow 1s ease-in-out infinite;
}
@keyframes slideArrow {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(6px); }
}
#next-hint kbd {
  background: rgba(13, 71, 161, 0.3);
  border: 1px solid rgba(66, 165, 245, 0.4);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: monospace;
  font-size: 0.8em;
  color: #90CAF9;
}

#bgc { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 0; }

#pbar {
  position: fixed; bottom: 0; left: 0; height: 4px; width: 0%;
  background: linear-gradient(90deg, #00897B, #42A5F5, #E64A19);
  background-size: 300% 100%; animation: gradShift 4s linear infinite;
  z-index: 200; transition: width 0.12s linear;
}
@keyframes gradShift { 0%{background-position:0%} 100%{background-position:300%} }

.slide {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  display: flex; flex-direction: column;
  justify-content: center; align-items: center;
  padding: 3vh 6vw; gap: 0;
  opacity: 0; transition: opacity 0.9s ease;
  z-index: 10; pointer-events: none;
}
.slide.active { opacity: 1; }

:root {
  --bl: #1565C0; --bll: #42A5F5;
  --tl: #00897B; --tll: #4DB6AC;
  --or: #E64A19; --orl: #FF8A65;
}
.accent      { color: var(--bll); }
.accent-teal { color: var(--tll); }
.accent-org  { color: var(--orl); }

.divider {
  width: 70px; height: 4px; flex-shrink: 0;
  background: linear-gradient(90deg, var(--bll), var(--tll));
  border-radius: 2px; margin: 10px 0 16px;
}
.tag {
  display: inline-block; padding: 4px 14px; border-radius: 20px;
  font-size: .82rem; font-weight: 600; letter-spacing: .05em; border: 1px solid;
}
.tb { border-color:var(--bll); color:var(--bll); background:rgba(66,165,245,.1); }
.tt { border-color:var(--tll); color:var(--tll); background:rgba(77,182,172,.1); }
.to { border-color:var(--orl); color:var(--orl); background:rgba(255,138,101,.1); }
.slide-title {
  font-size: clamp(1.7rem, 2.6vw, 3rem); font-weight: 700;
  text-align: center; flex-shrink: 0;
}

/* ── S1: Title ── */
#s1 { gap: 12px; text-align: center; }
.main-title {
  font-size: clamp(3.5rem, 7vw, 8rem); font-weight: 900;
  letter-spacing: -.02em; line-height: 1;
  background: linear-gradient(135deg, #fff 20%, #42A5F5 80%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.subtitle  { font-size: clamp(1.1rem,2.1vw,2.2rem); color: #90CAF9; font-weight:300; max-width:950px; }
.authors   { font-size: clamp(.9rem,1.4vw,1.5rem); color: #B0BEC5; }
.affil     { font-size: clamp(.78rem,1.05vw,1.1rem); color: #78909C; }
.conf-badge {
  padding: 10px 32px; border: 2px solid var(--bll); border-radius: 30px;
  font-size: clamp(.95rem,1.7vw,1.8rem); font-weight: 700; color: var(--bll);
  text-transform: uppercase; letter-spacing: .1em;
  box-shadow: 0 0 24px rgba(66,165,245,.2); margin-top: 14px;
}
.tags-row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; }

/* ── S2: Architecture ── */
.arch-wrap { display:flex; flex-direction:column; align-items:center; gap:3px; width:100%; max-width:840px; }
.al {
  width:100%; padding:11px 22px; border-radius:10px; text-align:center;
  font-weight:600; font-size:clamp(.85rem,1.2vw,1.2rem);
  opacity:0; transform:translateY(7px); transition:opacity .4s ease, transform .4s ease;
}
.al.vis { opacity:1; transform:none; }
.al-sub { font-size:.7em; font-weight:400; color:#90CAF9; display:block; }
.al.la { background:rgba(21,101,192,.45); border:1px solid rgba(66,165,245,.5); }
.al.lb { background:rgba(0,105,92,.4); border:1px solid rgba(77,182,172,.5); }
.al.lc,.al.lf { display:flex; gap:8px; background:transparent; border:none; padding:0; }
.al.lc > div { flex:1; padding:11px; border-radius:10px; background:rgba(230,74,25,.15); border:1px solid rgba(255,138,101,.4); font-size:clamp(.8rem,1.05vw,1.05rem); }
.al.ld { background:rgba(21,101,192,.3); border:1px solid rgba(66,165,245,.35); }
.al.le { background:rgba(0,105,92,.3); border:1px solid rgba(77,182,172,.35); }
.al.lf > div { flex:1; padding:11px; border-radius:10px; background:rgba(183,28,28,.2); border:1px solid rgba(239,83,80,.4); font-size:clamp(.78rem,1vw,1rem); }
.aarr { font-size:1.4rem; color:var(--bll); opacity:0; transition:opacity .3s; }
.aarr.vis { opacity:1; }

/* ── S3: Scenarios ── */
.scen-grid { display:grid; grid-template-columns:1fr 1fr; gap:12px; width:100%; max-width:1100px; }
.sc {
  background:rgba(13,71,161,.15); border:1px solid rgba(66,165,245,.2);
  border-radius:13px; padding:16px 18px;
  opacity:0; transform:translateY(12px); transition:opacity .4s ease, transform .4s ease;
}
.sc.vis { opacity:1; transform:none; }
.sc-num { font-size:.7rem; font-weight:700; text-transform:uppercase; letter-spacing:.12em; color:var(--bll); margin-bottom:3px; }
.sc-title { font-size:clamp(.92rem,1.3vw,1.3rem); font-weight:700; color:#E3F2FD; margin-bottom:5px; }
.sc-body { font-size:clamp(.75rem,.94vw,.94rem); color:#90CAF9; line-height:1.5; }
.badge { display:inline-block; margin-top:7px; padding:3px 10px; border-radius:12px; font-size:.7rem; font-weight:700; }
.b-block { background:rgba(230,74,25,.2); color:var(--orl); }
.b-alert { background:rgba(0,137,123,.2); color:var(--tll); }
.b-marl  { background:rgba(21,101,192,.3); color:#90CAF9; }

/* ── S4: Demo Steps ── */
.demo-row { display:grid; grid-template-columns:repeat(4,1fr); gap:12px; width:100%; max-width:1250px; }
.ds {
  background:rgba(0,105,92,.12); border:1px solid rgba(77,182,172,.25);
  border-radius:13px; overflow:hidden;
  opacity:0; transform:translateY(12px); transition:opacity .4s ease, transform .4s ease;
}
.ds.vis { opacity:1; transform:none; }
.ds-head { padding:18px 14px 12px; text-align:center; }
.ds-num {
  width:44px; height:44px; border-radius:50%;
  background:linear-gradient(135deg,#00897B,#1565C0);
  display:flex; align-items:center; justify-content:center;
  font-size:1.3rem; font-weight:800; margin:0 auto 9px;
  box-shadow:0 0 14px rgba(0,137,123,.4);
}
.ds-title { font-size:clamp(.9rem,1.2vw,1.2rem); font-weight:700; color:#E3F2FD; margin-bottom:5px; }
.ds-body  { font-size:clamp(.73rem,.88vw,.88rem); color:#90CAF9; line-height:1.45; }
.ds-img {
  width:100%; overflow:hidden; max-height:120px;
  background:rgba(255,255,255,.03); border-top:1px solid rgba(77,182,172,.2);
  display:flex; align-items:center; justify-content:center;
}
.ds-img img { width:100%; height:120px; object-fit:cover; object-position:top; display:block; }
.ds-img .ph { font-size:.65rem; color:#455A64; padding:8px; text-align:center; }

/* ── S5 & S6: Screenshot slides ── */
.ss-slide-inner { display:flex; gap:18px; align-items:flex-start; width:100%; max-width:1350px; flex:1; min-height:0; }
.ss-laptop {
  flex:1; min-width:0;
  border-radius:10px; overflow:hidden;
  box-shadow:0 8px 40px rgba(0,0,0,.6);
  border:1px solid rgba(66,165,245,.25);
  background:#111;
}
.ss-laptop-bar {
  height:20px; background:#1e1e2e;
  display:flex; align-items:center; padding:0 8px; gap:5px; flex-shrink:0;
}
.dot { width:8px; height:8px; border-radius:50%; }
.dot.r{background:#ff5f57;} .dot.y{background:#ffbd2e;} .dot.g{background:#28c940;}
.ss-url { font-size:.58rem; color:#555; margin-left:6px; }
.ss-laptop img { width:100%; display:block; min-height:40px; }
.ss-phone {
  width:clamp(130px,13vw,180px); flex-shrink:0;
  background:#0d0d1a; border:3px solid #2a2a3a;
  border-radius:28px; padding:7px;
  box-shadow:0 8px 40px rgba(0,0,0,.7);
}
.ss-phone-notch {
  width:50%; height:8px; background:#1a1a2a;
  border-radius:4px; margin:0 auto 5px;
}
.ss-phone img { width:100%; border-radius:18px; display:block; }
.ss-no-img {
  min-height:200px; display:flex; align-items:center; justify-content:center;
  font-size:.75rem; color:#37474F; text-align:center; padding:12px;
}
.ss-caption {
  display:flex; gap:10px; flex-wrap:wrap; margin-top:10px; flex-shrink:0; justify-content:center;
}

/* ── S7: Agents & Metrics ── */
.am-grid { display:grid; grid-template-columns:1fr 1fr; gap:20px; width:100%; max-width:980px; }
.amc { background:rgba(13,71,161,.12); border:1px solid rgba(66,165,245,.2); border-radius:13px; padding:20px 22px; }
.amc-title { font-size:clamp(.95rem,1.35vw,1.35rem); font-weight:700; color:var(--bll); margin-bottom:10px; }
.agent-list { list-style:none; font-size:clamp(.8rem,1vw,1rem); line-height:2; color:#B0BEC5; }
.agent-list li::before { content:'▶ '; color:var(--bll); }
.mi { display:flex; align-items:baseline; gap:8px; margin-bottom:8px; }
.mi-name { font-size:clamp(.8rem,1vw,1rem); color:#90CAF9; white-space:nowrap; }
.mi-dot  { flex:1; border-bottom:1px dotted rgba(66,165,245,.2); min-width:10px; }
.mi-val  { font-size:clamp(.82rem,1.05vw,1.05rem); font-weight:700; color:var(--tll); white-space:nowrap; }

/* ── S_VID: Demo Video ── */
.vid-wrap {
  display:flex; gap:30px; align-items:center;
  width:100%; max-width:1100px;
}
.vid-thumb-wrap {
  position:relative; flex:1; cursor:pointer;
  border-radius:12px; overflow:hidden;
  border:2px solid rgba(66,165,245,.35);
  box-shadow:0 8px 40px rgba(0,0,0,.6);
  text-decoration:none; display:block;
}
.vid-thumb { width:100%; display:block; min-height:180px; background:#0d1b2a; }
.vid-play-btn {
  position:absolute; top:50%; left:50%; transform:translate(-50%,-50%);
  width:72px; height:72px; border-radius:50%;
  background:rgba(230,74,25,.88); display:flex; align-items:center; justify-content:center;
  font-size:1.9rem; color:#fff; box-shadow:0 0 30px rgba(230,74,25,.5);
  transition:transform .2s; pointer-events:none;
}
.vid-thumb-wrap:hover .vid-play-btn { transform:translate(-50%,-50%) scale(1.1); }
.vid-side {
  display:flex; flex-direction:column; align-items:center; gap:12px;
  min-width:210px;
}
#vid-qr canvas, #vid-qr img { border-radius:10px; border:5px solid #fff; display:block; }
.vid-qr-placeholder {
  width:190px; height:190px; border-radius:10px; border:5px solid #fff;
  background:#fff; display:flex; align-items:center; justify-content:center;
  font-size:.65rem; color:#333; text-align:center; padding:8px;
}
.vid-scan-lbl { font-size:clamp(.9rem,1.4vw,1.4rem); color:#90CAF9; font-weight:600; }
.vid-url-lbl { font-size:clamp(.72rem,.95vw,.95rem); color:#546E7A; letter-spacing:.02em; }
.vid-watch-btn {
  display:inline-block; padding:10px 26px; border-radius:25px;
  background:linear-gradient(135deg,#E64A19,#c62828);
  color:#fff; font-weight:700; font-size:clamp(.85rem,1.1vw,1.1rem);
  text-decoration:none; margin-top:4px;
  box-shadow:0 4px 20px rgba(230,74,25,.35);
  transition:transform .15s, box-shadow .15s;
}
.vid-watch-btn:hover { transform:scale(1.04); box-shadow:0 6px 28px rgba(230,74,25,.5); }
#svid { pointer-events:all; }

/* ── S8: Contact ── */
#s8 { text-align:center; gap:16px; }
.fin-title {
  font-size:clamp(3rem,5vw,6rem); font-weight:900;
  background:linear-gradient(135deg,#fff 20%,#42A5F5 100%);
  -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;
}
.fin-sub { font-size:clamp(.95rem,1.7vw,1.8rem); color:#90CAF9; }
.contact-row { display:flex; gap:20px; flex-wrap:wrap; justify-content:center; }
.ci { background:rgba(13,71,161,.2); border:1px solid rgba(66,165,245,.25); border-radius:12px; padding:14px 26px; }
.ci-lbl { font-size:.67em; text-transform:uppercase; letter-spacing:.1em; color:#546E7A; margin-bottom:3px; }
.ci-val { color:var(--bll); font-weight:600; font-size:clamp(.85rem,1.15vw,1.15rem); }

#wm {
  position:fixed; bottom:11px; left:50%; transform:translateX(-50%);
  font-size:clamp(.52rem,.75vw,.75rem); color:rgba(144,202,249,.3);
  z-index:150; white-space:nowrap; letter-spacing:.04em;
}