:root{
  --bg:#ffffff;
  --ink:#02040a;
  --soft:rgba(2,4,10,.55);
  --mute:rgba(2,4,10,.42);
  --line:rgba(2,4,10,.10);
  --line-strong:rgba(2,4,10,.16);
  --sans:'Hanken Grotesk',system-ui,sans-serif;
  --mono:'Hanken Grotesk',system-ui,sans-serif;
  --serif:'Cormorant Garamond','EB Garamond',ui-serif,Georgia,serif;
  --slide-duration:4s;
}
*{box-sizing:border-box;margin:0;padding:0}
html{color-scheme:light}
html,body{min-height:100%}
body{
  background:var(--bg);
  background-image:
    radial-gradient(ellipse at 28% 8%, rgba(2,4,10,.02) 0%, transparent 58%),
    radial-gradient(ellipse at 78% 92%, rgba(2,4,10,.03) 0%, transparent 62%),
    radial-gradient(ellipse at 50% 50%, rgba(2,4,10,.015) 0%, transparent 75%);
  color:var(--ink);
  font-family:var(--sans);font-weight:300;font-size:15px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  min-height:100vh;
  overflow:hidden;
}
body::after{
  content:'';position:fixed;inset:0;z-index:1;pointer-events:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 240 240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.95' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .55 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  opacity:.04;mix-blend-mode:multiply;
}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}

/* ===========================================================
   Inter-slide flash (subtle pulse during transition)
   =========================================================== */
.flash{
  position:fixed;inset:0;z-index:6;pointer-events:none;
  background:radial-gradient(ellipse at center, rgba(2,4,10,.05) 0%, transparent 65%);
  opacity:0;mix-blend-mode:multiply;
}
.flash.fire{animation:flashFire .65s cubic-bezier(.16,1,.3,1) forwards}
@keyframes flashFire{
  0%{opacity:0}
  35%{opacity:1}
  100%{opacity:0}
}

/* ===========================================================
   Fixed shell - nav, brand mark, dots, counter.
   =========================================================== */
.shell{
  position:fixed;inset:0;z-index:5;pointer-events:none;
  display:flex;flex-direction:column;
  padding:24px;
}
@media(min-width:768px){.shell{padding:36px 56px}}
.shell > *{pointer-events:auto}
.shell-top{
  display:flex;justify-content:space-between;align-items:flex-start;gap:24px;
}
.shell-brand{
  font-family:var(--mono);font-size:10px;letter-spacing:.32em;
  text-transform:uppercase;color:var(--soft);line-height:1.8;
}
.shell-brand strong{color:var(--ink);font-weight:500}
.shell-nav{display:flex;gap:20px;flex-wrap:wrap;justify-content:flex-end}
.shell-nav a{
  font-family:var(--mono);font-size:12px;letter-spacing:.2em;font-weight:300;
  text-transform:uppercase;color:var(--ink);
  transition:opacity 180ms ease;opacity:.92;
}
.shell-nav a:hover{opacity:1}
.shell-bottom{
  margin-top:auto;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:end;gap:24px;
}
.shell-progress{
  grid-column:2;justify-self:center;
  display:flex;flex-direction:column;gap:16px;align-items:center;
}
.shell-next{
  font-family:var(--mono);font-size:13px;letter-spacing:.28em;
  text-transform:uppercase;font-weight:500;
  display:inline-flex;align-items:center;gap:12px;cursor:pointer;
  padding:8px 14px;border-radius:999px;
  transition:transform 200ms ease,background 200ms ease;
}
.shell-next:hover{transform:translateY(-1px);background:rgba(2,4,10,.04)}
.shell-next:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.shell-next .shell-next-label{color:var(--mute)}
.shell-next .shell-next-name{color:var(--ink);font-weight:500}
.shell-next .shell-next-arrow{
  color:var(--ink);font-size:1.15em;
  animation:nextPulse 1.6s ease-in-out infinite;
}
@keyframes nextPulse{0%,100%{transform:translateX(0);opacity:.55}50%{transform:translateX(5px);opacity:1}}
.shell-dots{display:flex;gap:12px;align-items:center}
.shell-dot{
  width:48px;height:4px;background:rgba(2,4,10,.22);
  border:none;border-radius:3px;padding:0;cursor:pointer;
  position:relative;overflow:hidden;
  transition:background 200ms ease;
}
.shell-dot:hover{background:rgba(2,4,10,.42)}
.shell-dot.is-active{background:rgba(2,4,10,.28)}
.shell-dot.is-active::after{
  content:'';position:absolute;left:0;top:0;bottom:0;width:0;
  background:var(--ink);
  animation:fill var(--slide-duration,4s) linear forwards;
}
@keyframes fill{from{width:0}to{width:100%}}
.shell-counter{
  grid-column:3;justify-self:end;
  font-family:var(--mono);font-size:10px;letter-spacing:.32em;
  text-transform:uppercase;color:var(--soft);text-align:right;line-height:1.8;
}
.shell-counter strong{color:var(--ink);font-weight:500}
@media(max-width:680px){
  .shell-nav{gap:12px}
  .shell-nav a{font-size:11px;letter-spacing:.14em}
  .shell-bottom{gap:12px}
  .shell-progress{gap:12px}
  .shell-next{font-size:11px;letter-spacing:.2em;gap:8px;padding:6px 10px}
  .shell-dot{width:32px;height:3px}
  .shell-dots{gap:9px}
}

/* ===========================================================
   Slide track + transitions.
   =========================================================== */
.track{
  position:fixed;inset:0;z-index:3;
  display:flex;width:400%;
  transition:transform 750ms cubic-bezier(.7,0,.18,1);
  will-change:transform;
  touch-action:pan-y;
  user-select:none;-webkit-user-select:none;
}
.track.is-dragging{transition:none}
/* During an active drag, kill the slide blur AND its transition so the
   filter doesn't animate across all four slides on every touch movement -
   that animation chokes mobile GPUs and makes the finger-tracking feel
   sluggish. */
.track.is-dragging .slide{filter:none;transition:none}
.slide{
  width:25%;height:100vh;
  flex-shrink:0;
  position:relative;
  display:flex;align-items:center;justify-content:center;
  padding:120px 40px;
  overflow:hidden;
}
@media(min-width:768px){.slide{padding:140px 80px}}

/* Outgoing slide blurs and fades */
.slide{filter:blur(8px) opacity(.35);transition:filter 750ms cubic-bezier(.7,0,.18,1)}
.slide.is-active{filter:none}

/* Per-slide ambient background layer */
.slide-ambient{
  position:absolute;inset:0;z-index:1;pointer-events:none;
  overflow:hidden;
}
.slide-ambient--vignette{
  background:
    radial-gradient(ellipse at 50% 50%, rgba(2,4,10,.02) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 100%, rgba(2,4,10,.06) 0%, transparent 60%);
}
.slide-ambient--grid{
  background-image:
    linear-gradient(rgba(2,4,10,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(2,4,10,.05) 1px, transparent 1px);
  background-size:48px 48px;
  background-position:center center;
  -webkit-mask-image:radial-gradient(ellipse at 50% 50%, #000 30%, transparent 78%);
          mask-image:radial-gradient(ellipse at 50% 50%, #000 30%, transparent 78%);
}
.slide-ambient--glow{
  background:radial-gradient(ellipse 60% 50% at 30% 50%, rgba(2,4,10,.03) 0%, transparent 65%);
}
.slide-ambient--ripple{
  background:radial-gradient(ellipse at 75% 50%, rgba(2,4,10,.03) 0%, transparent 60%);
}

/* Slide inner content - no master fade; each child reveals on its own.
   Add .stagger.s-N to a child to give it a staggered entrance. */
.slide-inner{
  position:relative;z-index:2;
  display:flex;flex-direction:column;gap:18px;
  max-width:1100px;width:100%;
}
.stagger{
  opacity:0;transform:translateY(22px);filter:blur(6px);
  will-change:opacity,transform,filter;
}
.slide.is-active .stagger{
  animation:staggerIn 720ms cubic-bezier(.2,.85,.2,1) both;
}
.slide.is-active .s-1{animation-delay:.35s}
.slide.is-active .s-2{animation-delay:.80s}
.slide.is-active .s-3{animation-delay:1.25s}
.slide.is-active .s-4{animation-delay:1.70s}
.slide.is-active .s-5{animation-delay:2.15s}
@keyframes staggerIn{to{opacity:1;transform:none;filter:none}}

.slide-num{
  font-family:var(--mono);font-size:11px;letter-spacing:.42em;font-weight:500;
  color:var(--soft);text-transform:uppercase;
  display:inline-flex;align-items:center;gap:14px;
  align-self:flex-start;
}
.slide-num::before{content:'';width:36px;height:1.5px;background:currentColor}

.slide-title{
  font-family:var(--sans);font-weight:300;
  font-size:clamp(64px,12vw,180px);line-height:.9;letter-spacing:-.04em;
  text-transform:uppercase;color:var(--ink);
}
.slide-title em{font-style:italic;font-family:var(--serif);font-weight:400;color:rgba(2,4,10,.7)}

.slide-body{
  font-size:17px;font-weight:300;line-height:1.55;
  color:rgba(2,4,10,.65);max-width:520px;
}

/* Inline CTAs per slide */
.slide-cta{
  display:inline-flex;align-items:center;gap:10px;
  margin-top:18px;align-self:flex-start;
  font-family:var(--sans);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;font-weight:600;
  padding:13px 22px;
  background:linear-gradient(180deg,#1a2233 0%,#02040a 100%);
  color:#ffffff;border-radius:999px;
  box-shadow:0 6px 18px rgba(2,4,10,.18);
  transition:transform 120ms ease,box-shadow 220ms ease;
}
.slide-cta:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(2,4,10,.26)}
.slide-cta .arrow{transition:transform .3s}
.slide-cta:hover .arrow{transform:translateX(4px)}
.slide-cta--ghost{
  background:transparent;color:var(--ink);
  border:1px solid rgba(2,4,10,.22);box-shadow:none;
}
.slide-cta--ghost:hover{background:rgba(2,4,10,.04);border-color:rgba(2,4,10,.55)}

/* ===========================================================
   Slide 01 - NAME (loops reveal animation)
   =========================================================== */
.slide--name .slide-inner{align-items:center;text-align:center}
.reveal-mark{
  display:flex;gap:.05em;
  font-family:var(--sans);font-weight:300;
  font-size:clamp(120px,22vw,300px);line-height:.9;
  letter-spacing:-.06em;text-transform:uppercase;color:var(--ink);
  text-shadow:0 0 80px rgba(2,4,10,.10);
}
.reveal-letter{
  display:inline-block;
  opacity:0;will-change:transform,opacity,filter;
}
.slide.is-active .reveal-letter--1{
  animation:revL1 1.0s cubic-bezier(.16,1,.3,1) .35s forwards;
}
.slide.is-active .reveal-letter--2{
  animation:revL2 1.1s cubic-bezier(.16,1,.3,1) .55s forwards;
}
.slide.is-active .reveal-letter--3{
  animation:revL3 1.1s cubic-bezier(.16,1.2,.3,1) .75s forwards;
}
@keyframes revL1{from{transform:translateY(-140px);filter:blur(12px);opacity:0}to{transform:none;filter:blur(0);opacity:1}}
@keyframes revL2{from{transform:translateY(80px) rotate(10deg);filter:blur(12px);opacity:0}to{transform:none;filter:blur(0);opacity:1}}
@keyframes revL3{from{transform:scale(.28) translateY(40px);filter:blur(12px);opacity:0}to{transform:none;filter:blur(0);opacity:1}}
.reveal-line{
  width:0;height:1px;
  background:linear-gradient(90deg,transparent 0%,rgba(2,4,10,.6) 50%,transparent 100%);
  margin:14px 0;
}
.slide.is-active .reveal-line{animation:revLine 1.0s cubic-bezier(.65,0,.35,1) 1.2s forwards}
@keyframes revLine{from{width:0}to{width:240px}}
.reveal-sub{
  font-family:var(--mono);font-size:12px;letter-spacing:.5em;font-weight:500;
  color:var(--soft);text-transform:uppercase;
  opacity:0;transform:translateY(10px);
  padding-left:.5em;
}
.slide.is-active .reveal-sub{animation:revSub 1.0s cubic-bezier(.2,.8,.2,1) 1.4s forwards}
@keyframes revSub{to{opacity:1;transform:none}}

/* ===========================================================
   Slide 02 - PRACTICE (architectural line drawing)
   =========================================================== */
.slide--practice .slide-inner{align-items:flex-start;text-align:left}
.line-drawing{
  position:absolute;inset:0;width:100%;height:100%;
  pointer-events:none;z-index:1;
}
.line-drawing path,.line-drawing line{
  stroke:rgba(2,4,10,.3);stroke-width:1;fill:none;
  stroke-dasharray:1000;stroke-dashoffset:1000;
}
.slide.is-active .line-drawing path,
.slide.is-active .line-drawing line{
  animation:drawIn 2.0s cubic-bezier(.65,0,.35,1) .3s forwards;
}
.slide.is-active .line-drawing .ld-2{animation-delay:.55s}
.slide.is-active .line-drawing .ld-3{animation-delay:.80s}
.slide.is-active .line-drawing .ld-4{animation-delay:1.05s}
.slide.is-active .line-drawing .ld-5{animation-delay:1.30s}
@keyframes drawIn{to{stroke-dashoffset:0}}

/* ===========================================================
   Slide 03 - TUTORING (large counting numbers)
   =========================================================== */
.slide--tutoring .slide-stats{
  display:flex;gap:64px;margin-top:24px;flex-wrap:wrap;
}
.slide--tutoring .stat-block{display:flex;flex-direction:column;gap:8px}
.slide--tutoring .stat-num{
  font-size:128px;font-weight:200;line-height:1;letter-spacing:-.04em;color:var(--ink);
  font-variant-numeric:tabular-nums;
  display:flex;align-items:baseline;gap:.04em;
}
.slide--tutoring .stat-num small{
  font-family:var(--mono);font-size:.22em;color:var(--soft);font-weight:500;
  transform:translateY(-1.5em);
}
.slide--tutoring .stat-label{
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--mute);font-weight:500;
}
.slide--tutoring .tutoring-focus{
  margin-top:32px;max-width:520px;
  font-size:15px;line-height:1.6;font-weight:300;color:var(--soft);
  letter-spacing:.01em;
}
@media(max-width:680px){
  /* The tutoring slide stacks the heaviest content (numbers + labels +
     focus line + CTA). On phones the default vertical centering pushes
     the title up into the fixed nav. Anchor it to the top and tighten
     the typography so everything fits inside the safe area. */
  .slide--tutoring{align-items:flex-start;padding-top:96px;padding-bottom:120px}
  .slide--tutoring .slide-inner{gap:14px}
  .slide--tutoring .slide-stats{gap:36px;margin-top:14px}
  .slide--tutoring .stat-num{font-size:64px}
  .slide--tutoring .tutoring-focus{font-size:13px;margin-top:18px;line-height:1.55}
}
@media(max-width:380px){
  .slide--tutoring .stat-num{font-size:54px}
  .slide--tutoring{padding-top:88px}
}

/* ===========================================================
   Slide 04 - MASTERCLASS (pulsing field)
   =========================================================== */
.slide--masterclass .slide-inner{align-items:flex-start}
.slide--masterclass .tag{
  display:inline-flex;align-items:center;gap:10px;
  padding:7px 14px;border-radius:999px;
  border:1px solid rgba(2,4,10,.3);background:rgba(2,4,10,.04);
  font-family:var(--mono);font-size:10px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--ink);font-weight:500;
}
.slide--masterclass .tag::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--ink);
  animation:pulse 1.6s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:.4}50%{opacity:1}}
.ripple-stack{
  position:absolute;right:8%;top:50%;transform:translateY(-50%);
  width:520px;height:520px;max-width:60vw;max-height:60vw;
  z-index:1;pointer-events:none;opacity:0;
  transition:opacity 700ms ease 300ms;
}
.slide.is-active .ripple-stack{opacity:1}
.ripple{
  position:absolute;inset:50% 0 0 50%;
  width:0;height:0;border-radius:50%;
  border:1px solid rgba(2,4,10,.22);
  transform:translate(-50%,-50%);
}
.slide.is-active .ripple{animation:rippleOut 4.5s cubic-bezier(.16,1,.3,1) infinite}
.slide.is-active .ripple--2{animation-delay:1.1s}
.slide.is-active .ripple--3{animation-delay:2.2s}
.slide.is-active .ripple--4{animation-delay:3.3s}
@keyframes rippleOut{
  0%{width:0;height:0;opacity:.7;border-width:1.5px}
  100%{width:520px;height:520px;opacity:0;border-width:.5px}
}