/* ═══ Reset ═══ */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root{
  --bg:#FAFAF7;
  --surface:#FFFFFF;
  --ink:#141210;
  --ink2:#58534B;
  --ink3:#9C968D;
  --accent:#C24D18;
  --accent-light:#FDF0E9;
  --green:#2D6A4F;
  --green-light:#E8F3ED;
  --border:#E9E6E0;
  --radius:14px;
  --sans:'Inter',system-ui,-apple-system,sans-serif;
  --serif:'Instrument Serif',Georgia,serif;
}

html{font-size:16px;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--ink);
  overflow:hidden;
  height:100dvh;
  width:100vw;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

/* ═══ Progress bar ═══ */
.progress-track{
  position:fixed;top:0;left:0;right:0;height:3px;
  background:var(--border);z-index:200;
}
.progress-fill{
  height:100%;width:25%;
  background:var(--accent);
  transition:width .5s cubic-bezier(.4,0,.2,1);
}

/* ═══ Logo ═══ */
.logo{
  position:fixed;top:20px;left:24px;
  font-family:var(--serif);font-size:1.15rem;
  color:var(--ink);text-decoration:none;
  z-index:200;letter-spacing:-.02em;
}
.logo i{font-style:italic;color:var(--accent)}

/* ═══ Counter pill ═══ */
.counter-pill{
  position:fixed;top:20px;right:24px;
  font-size:.75rem;font-weight:600;
  color:var(--ink3);z-index:200;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:100px;padding:5px 14px;
  font-variant-numeric:tabular-nums;
}
.counter-sep{margin:0 2px;opacity:.4}

/* ═══ Deck ═══ */
.deck{position:relative;height:100dvh;width:100%}

.slide{
  position:absolute;inset:0;
  display:flex;align-items:flex-start;justify-content:center;
  opacity:0;pointer-events:none;
  transform:translateY(24px);
  transition:opacity .45s ease,transform .45s ease;
  overflow-y:auto;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:none;
}
.slide::-webkit-scrollbar{display:none}
.slide.active{
  opacity:1;pointer-events:auto;
  transform:translateY(0);
}

.s-inner{
  width:100%;max-width:720px;
  padding:72px 24px 120px;
}

/* ═══ Typography ═══ */
.eyebrow{
  display:inline-block;
  font-size:.65rem;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);margin-bottom:16px;
}

h1{
  font-family:var(--serif);
  font-size:2.6rem;line-height:1.15;
  font-weight:400;margin-bottom:28px;
  letter-spacing:-.02em;
}
h1 i{font-style:italic;color:var(--accent)}

h2{
  font-family:var(--serif);
  font-size:1.4rem;font-weight:400;
  margin-bottom:16px;letter-spacing:-.01em;
}

h3{
  font-size:.95rem;font-weight:700;
  margin-bottom:12px;letter-spacing:-.01em;
}

.lead{
  font-size:1rem;line-height:1.65;
  color:var(--ink2);margin-bottom:40px;
  max-width:540px;
}

p{font-size:.88rem;line-height:1.6;color:var(--ink2)}

/* ═══ SLIDE 1 — Hypothesis + Steps ═══ */
.hypothesis-box{
  background:var(--accent-light);
  border-left:3px solid var(--accent);
  border-radius:0 var(--radius) var(--radius) 0;
  padding:20px 24px;margin-bottom:36px;
}
.hypothesis-box p{
  font-family:var(--serif);font-style:italic;
  font-size:1.1rem;color:var(--ink);line-height:1.5;
}

.steps{list-style:none;margin-bottom:40px}
.step{
  display:flex;align-items:flex-start;gap:16px;
  padding:18px 0;
  border-bottom:1px solid var(--border);
  position:relative;
}
.step:last-child{border-bottom:none}
.step-time{
  font-family:var(--serif);font-size:1.6rem;
  color:var(--ink);min-width:64px;
  line-height:1;padding-top:2px;
}
.step-body strong{
  display:block;font-size:.9rem;margin-bottom:2px;
}
.step-body .step-meta{
  font-size:.68rem;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;
  color:var(--accent);
}
.step-body p{font-size:.82rem;margin-top:6px}

.step--dead{
  background:var(--accent-light);
  border-radius:var(--radius);
  padding:18px 16px;
  border-bottom:none;
  margin-top:4px;
  border:1.5px solid var(--accent);
}
.step--dead .step-time{color:var(--accent)}

.verdict{
  display:flex;align-items:baseline;gap:16px;
  flex-wrap:wrap;
}
.verdict-num{
  font-family:var(--serif);font-size:3rem;
  color:var(--ink);line-height:1;letter-spacing:-.03em;
}
.verdict p{
  font-family:var(--serif);font-style:italic;
  font-size:1rem;color:var(--ink2);line-height:1.5;
  max-width:380px;
}

/* ═══ SLIDE 2 — Problem cards ═══ */
.card-row{
  display:grid;grid-template-columns:1fr;gap:14px;
}
.card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:24px;
  transition:border-color .2s;
}
.card:hover{border-color:var(--ink3)}
.card-num{
  font-family:var(--serif);font-size:1.8rem;
  color:var(--border);margin-bottom:8px;line-height:1;
}
.card h3{font-size:.95rem;margin-bottom:8px}
.card p{font-size:.84rem;margin-bottom:14px}
.card-fact{
  display:inline-block;
  font-size:.68rem;font-weight:700;
  letter-spacing:.06em;text-transform:uppercase;
  color:var(--accent);
  padding-top:10px;border-top:1px solid var(--border);
  width:100%;
}

/* ═══ SLIDE 3 — VS grid ═══ */
.vs-grid{
  display:grid;grid-template-columns:1fr 1px 1fr;
  gap:0;margin-bottom:44px;
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
}
.vs-col{padding:28px 24px}
.vs-col h3{
  font-size:.8rem;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;
  margin-bottom:18px;
}
.vs-bad h3{color:var(--accent)}
.vs-good h3{color:var(--green)}
.vs-divider{background:var(--border)}

.vs-col ul{list-style:none}
.vs-col li{
  display:flex;gap:12px;align-items:flex-start;
  margin-bottom:18px;
}
.vs-col li:last-child{margin-bottom:0}
.vs-col li strong{display:block;font-size:.85rem;margin-bottom:2px}
.vs-col li p{font-size:.78rem;margin:0}

.ico-x,.ico-check{
  width:20px;height:20px;min-width:20px;
  margin-top:1px;
}
.ico-x{color:var(--accent)}
.ico-check{color:var(--green)}

.pipe-title{
  font-size:1rem;font-family:var(--sans);
  font-weight:700;margin-bottom:16px;
  letter-spacing:-.01em;
}

.pipeline{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:6px;
}
.pipe{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px 14px;
  position:relative;
}
.pipe::before{
  content:attr(data-n);
  font-family:var(--serif);font-size:1.4rem;
  color:var(--border);display:block;
  margin-bottom:4px;line-height:1;
}
.pipe h4{font-size:.78rem;font-weight:700;margin-bottom:4px}
.pipe p{font-size:.72rem;margin:0}

.pipe--end{
  background:var(--green-light);
  border-color:var(--green);
}
.pipe--end::before{color:var(--green)}
.pipe--end h4{color:var(--green)}

/* ═══ SLIDE 4 — Metrics ═══ */
.metric-row{
  display:grid;grid-template-columns:1fr;gap:14px;
  margin-bottom:36px;
}
.metric{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px 24px;
}
.metric-val{
  display:block;
  font-family:var(--serif);font-size:3.2rem;
  color:var(--ink);line-height:1;
  margin-bottom:6px;letter-spacing:-.03em;
}
.metric-val small{
  font-size:1.2rem;color:var(--accent);
  margin-left:2px;
}
.metric-label{
  display:block;
  font-size:.65rem;font-weight:700;
  letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink3);margin-bottom:10px;
}
.metric p{font-size:.84rem}

.cta-block{
  background:var(--green-light);
  border-left:3px solid var(--green);
  border-radius:0 var(--radius) var(--radius) 0;
  padding:24px 28px;
}
.cta-label{
  display:inline-block;
  font-size:.65rem;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;
  color:var(--green);margin-bottom:10px;
}
.cta-block p{font-size:.92rem;color:var(--ink);line-height:1.7}

/* ═══ Bottom nav ═══ */
.deck-nav{
  position:fixed;bottom:0;left:0;right:0;
  display:flex;align-items:center;justify-content:center;
  gap:16px;padding:14px 24px 20px;
  z-index:200;
  background:linear-gradient(transparent,var(--bg) 40%);
  pointer-events:none;
}
.deck-nav>*{pointer-events:auto}

.nav-btn{
  width:40px;height:40px;
  border-radius:50%;border:1.5px solid var(--border);
  background:var(--surface);color:var(--ink);
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;transition:all .2s;
}
.nav-btn:hover:not(:disabled){
  border-color:var(--accent);color:var(--accent);
}
.nav-btn:disabled{opacity:.25;cursor:default}

.nav-dots{display:flex;gap:8px;align-items:center}
.dot{
  width:8px;height:8px;border-radius:50%;
  border:none;background:var(--border);
  cursor:pointer;transition:all .3s;
  padding:0;
}
.dot.active{
  background:var(--accent);
  width:24px;border-radius:100px;
}

/* ═══ Desktop (≥640) ═══ */
@media(min-width:640px){
  .s-inner{max-width:800px;padding:80px 32px 120px}
  h1{font-size:3rem}
  .card-row{grid-template-columns:repeat(3,1fr)}
  .metric-row{grid-template-columns:repeat(3,1fr)}
}

/* ═══ Large desktop ═══ */
@media(min-width:1024px){
  .s-inner{max-width:900px;padding:80px 40px 120px}
  h1{font-size:3.2rem}
}

/* ═══ Small phone ═══ */
@media(max-width:420px){
  h1{font-size:1.8rem}
  .hypothesis-box p{font-size:.95rem}
  .step-time{font-size:1.3rem;min-width:52px}
  .verdict-num{font-size:2.2rem}

  .vs-grid{
    grid-template-columns:1fr;
    grid-template-rows:auto auto;
  }
  .vs-divider{height:1px;width:100%}

  .pipeline{
    grid-template-columns:1fr;
    gap:8px;
  }
  .pipe{
    display:grid;
    grid-template-columns:40px 1fr;
    gap:0 10px;
    padding:14px;
  }
  .pipe::before{grid-row:1/3;align-self:center}
  .pipe h4{margin-bottom:0}

  .metric-val{font-size:2.4rem}
}

/* ═══ Mid phone (421-639) ═══ */
@media(min-width:421px) and (max-width:639px){
  h1{font-size:2.1rem}

  .pipeline{
    grid-template-columns:repeat(3,1fr);
  }
  /* wrap last 2 into second row */
  .pipeline .pipe:nth-child(4),
  .pipeline .pipe:nth-child(5){
    grid-column:auto;
  }
}

/* safe area for phones with gestures */
@supports(padding-bottom:env(safe-area-inset-bottom)){
  .deck-nav{padding-bottom:calc(16px + env(safe-area-inset-bottom))}
}