:root{
  --ink:#142238;
  --muted:#5d6b7e;
  --line:#d4dee9;
  --blue:#173f70;
  --blue-dark:#102e53;
  --teal:#24766f;
  --yellow:#e5b846;
  --red:#b84646;
  --paper:#ffffff;
  --soft:#f2f6fa;
  --bar:72px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  overflow:hidden;
  background:#edf2f6;
  color:var(--ink);
  font-family:Inter,system-ui,sans-serif;
  line-height:1.5;
}
button,a{font:inherit}

.deck{position:fixed;inset:0 0 var(--bar);overflow:hidden}
.slide{
  position:absolute;
  inset:0;
  overflow:auto;
  padding:30px 42px 38px;
  opacity:0;
  visibility:hidden;
  transform:translateX(24px);
  transition:opacity .22s ease,transform .22s ease,visibility .22s;
  -webkit-overflow-scrolling:touch;
}
.slide.active{opacity:1;visibility:visible;transform:none}
.slide.reverse{transform:translateX(-24px)}
.frame{width:min(1180px,100%);min-height:100%;margin:0 auto;display:flex;flex-direction:column;justify-content:center}
.sheet{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:30px 34px;box-shadow:0 16px 38px rgba(20,34,56,.08)}

.back{
  position:fixed;
  z-index:30;
  top:12px;
  right:14px;
  border:1px solid var(--line);
  border-radius:6px;
  padding:7px 11px;
  background:rgba(255,255,255,.94);
  color:var(--blue);
  font-size:.78rem;
  font-weight:700;
  text-decoration:none;
}

.cover{position:relative;overflow:hidden;background:var(--blue);color:#fff;min-height:min(680px,82vh);display:grid;grid-template-columns:1fr 44%;align-items:stretch;border-radius:8px}
.cover-copy{padding:54px 48px;display:flex;flex-direction:column;justify-content:center;position:relative;z-index:2}
.cover-image{min-height:420px;overflow:hidden}
.cover-image img{width:100%;height:100%;object-fit:cover;display:block}
.kicker{font-size:.78rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:#bdd3eb}
.cover h1{font:700 3.15rem/1.03 Lora,Georgia,serif;margin:14px 0 18px;letter-spacing:0}
.cover p{font-size:1.12rem;color:#e2edf7;max-width:36rem;margin:0}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.tags span{border:1px solid rgba(255,255,255,.3);border-radius:6px;padding:6px 10px;font-size:.78rem;font-weight:700;background:rgba(255,255,255,.08)}

.head{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.num{width:36px;height:36px;border-radius:6px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:.95rem;font-weight:800;flex:0 0 36px}
h2{font:700 2rem/1.12 Lora,Georgia,serif;margin:0;color:var(--blue);letter-spacing:0}
h3{font-size:1.05rem;line-height:1.25;margin:0 0 6px;color:var(--blue)}
p{margin:0 0 12px}
.lead{font-size:1.08rem;color:var(--muted);max-width:76ch;margin-bottom:20px}
.big-idea{border-left:7px solid var(--yellow);background:#fff9ea;padding:22px 24px;font:600 1.45rem/1.42 Lora,Georgia,serif;margin:16px 0;border-radius:0 7px 7px 0}
.note{border:1px solid #9bc9c2;background:#eff9f7;color:#18554f;padding:13px 15px;border-radius:7px;font-size:.92rem}
.warning{border:1px solid #e8c46d;background:#fff9e9;color:#6d4c12;padding:13px 15px;border-radius:7px;font-size:.92rem}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;align-items:stretch}
.panel{border:1px solid var(--line);border-radius:7px;padding:16px;background:#fbfdff}
.panel.teal{border-top:5px solid var(--teal)}
.panel.yellow{border-top:5px solid var(--yellow)}
.panel.red{border-top:5px solid var(--red)}
.panel b{display:block;margin-bottom:5px;color:var(--blue)}
.panel p,.panel li{font-size:.92rem;color:var(--muted)}

.steps{list-style:none;margin:0;padding:0;counter-reset:step;display:grid;gap:10px}
.steps li{counter-increment:step;position:relative;border:1px solid var(--line);border-radius:7px;background:#fff;padding:13px 15px 13px 50px;min-height:55px}
.steps li::before{content:counter(step);position:absolute;left:14px;top:13px;width:25px;height:25px;border-radius:5px;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:.76rem;font-weight:800}
.steps b{display:block;font-size:.95rem;margin-bottom:2px}
.steps span{font-size:.88rem;color:var(--muted)}

.check{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.check li{position:relative;border-bottom:1px solid #e3e9ef;padding:5px 0 10px 34px;font-size:.95rem}
.check li:last-child{border-bottom:0}
.check li::before{content:'✓';position:absolute;left:0;top:3px;width:23px;height:23px;border-radius:50%;display:grid;place-items:center;background:#e7f4f1;color:var(--teal);font-weight:900}

.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:7px;background:#fff}
table{border-collapse:collapse;width:100%;font-size:.9rem}
th,td{text-align:left;vertical-align:top;padding:11px 13px;border-bottom:1px solid #e2e8ef}
th{background:var(--soft);color:var(--blue);font-size:.74rem;text-transform:uppercase;letter-spacing:.04em}
tbody tr:last-child td{border-bottom:0}

.visual{margin:0;border:1px solid var(--line);border-radius:7px;overflow:hidden;background:#101827}
.visual img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover;cursor:zoom-in}
.visual figcaption{background:#fff;color:var(--muted);font-size:.75rem;padding:8px 11px}
.visual.tall img{aspect-ratio:4/3}

.meme{position:relative;border:5px solid #111;background:#111;border-radius:5px;overflow:hidden;color:#fff}
.meme img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}
.meme-text{position:absolute;left:12px;right:12px;text-align:center;color:#fff;font:900 1.25rem/1.08 Impact,Arial Black,sans-serif;text-transform:uppercase;text-shadow:-2px -2px 0 #000,2px -2px 0 #000,-2px 2px 0 #000,2px 2px 0 #000;letter-spacing:0}
.meme-text.top{top:12px}.meme-text.bottom{bottom:12px}

.message{border-left:6px solid var(--blue);background:#fff;border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line);border-radius:0 7px 7px 0;padding:14px 16px;margin-bottom:10px}
.message.personal{border-left-color:var(--yellow)}
.message.creator{border-left-color:var(--teal)}
.message.institution{border-left-color:var(--blue)}
.message .role{display:block;font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-bottom:4px}
.message p{margin:0;font-size:1rem}

.formula{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:14px 0}
.formula span{border:1px solid var(--line);background:#fff;padding:10px 13px;border-radius:6px;font-weight:700;color:var(--blue)}
.formula i{font-style:normal;color:var(--muted);font-weight:800}

.source{font-size:.72rem;color:var(--muted);margin-top:14px}
.source a{color:var(--blue)}

.nav-bar{position:fixed;z-index:25;left:0;right:0;bottom:0;height:var(--bar);display:flex;align-items:center;gap:12px;padding:0 20px;background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(20,34,56,.06)}
.nav-btn{height:42px;min-width:44px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--blue);font-weight:800;cursor:pointer}
.nav-btn.primary{padding:0 17px;background:var(--blue);border-color:var(--blue);color:#fff}
.nav-btn:disabled{opacity:.35;cursor:default}
.nav-btn:hover:not(:disabled){background:var(--soft)}
.nav-btn.primary:hover:not(:disabled){background:var(--blue-dark)}
.progress-wrap{flex:1;min-width:0}
.progress-label{display:flex;justify-content:space-between;gap:10px;font-size:.76rem;font-weight:700;color:var(--muted);margin-bottom:6px}
.progress-label span:first-child{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--ink)}
.track{height:5px;border-radius:3px;background:#dfe7ef;overflow:hidden}
.track i{display:block;height:100%;width:0;background:var(--teal);transition:width .2s ease}

.image-modal{position:fixed;z-index:80;inset:0;background:rgba(8,16,28,.92);display:none;align-items:center;justify-content:center;padding:24px}
.image-modal.open{display:flex}
.image-modal img{max-width:94vw;max-height:88vh;object-fit:contain;border:2px solid #fff;box-shadow:0 18px 50px rgba(0,0,0,.45)}
.image-modal button{position:absolute;top:16px;right:18px;width:44px;height:44px;border:1px solid rgba(255,255,255,.6);border-radius:50%;background:#fff;color:#12213a;font-size:1.4rem;font-weight:900;cursor:pointer}

@media(max-width:900px){
  .slide{padding:22px 18px 30px}
  .sheet{padding:24px 22px}
  .cover{grid-template-columns:1fr;min-height:0}
  .cover-copy{padding:44px 28px}
  .cover-image{min-height:300px;max-height:38vh}
  .cover h1{font-size:2.5rem}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .visual img{max-height:34vh}
}

@media(min-width:1800px){
  html{font-size:22px}
  .frame{width:min(2200px,88%)}
  .cover{min-height:min(1080px,82vh)}
  .cover-image{min-height:680px}
}

@media(max-width:560px){
  :root{--bar:66px}
  .slide{padding:14px 10px 22px}
  .sheet{padding:20px 15px}
  .cover-copy{padding:34px 20px}.cover h1{font-size:2.05rem}.cover p{font-size:1rem}
  h2{font-size:1.55rem}.lead{font-size:.98rem}.big-idea{font-size:1.15rem;padding:17px}
  .nav-bar{padding:0 10px;gap:8px}.nav-btn.primary{padding:0 12px}.nav-btn .label{display:none}.back{display:none}
  .meme-text{font-size:1rem}
}

@media(prefers-reduced-motion:reduce){.slide,.track i{transition:none}}

@media print{
  body{overflow:visible;background:#fff}.deck{position:static}.slide{position:static;opacity:1;visibility:visible;transform:none;overflow:visible;page-break-after:always;padding:0;margin:0 0 14mm}.frame{min-height:0}.sheet{box-shadow:none}.nav-bar,.back,.image-modal{display:none!important}
  @page{size:landscape;margin:12mm}
}