/* ============================================================
   DegreeFlow — homepage styles
   ============================================================ */

:root{
  --bg:#080B14;
  --surface:#101522;
  --surface-2:#171D2D;
  --blue:#5B7CFF;
  --electric:#4DA3FF;
  --lavender:#9B8CFF;
  --mint:#5EE6A8;
  --text:#F5F7FF;
  --muted:#8992A8;
  --border:#252D40;

  --glass:rgba(19,25,40,.62);
  --glass-strong:rgba(21,28,46,.86);
  --radius-s:12px;
  --radius:16px;
  --radius-l:22px;

  --shell:1200px;
  --ease:cubic-bezier(.16,1,.3,1);
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  background:#06080F;
  color:var(--text);
  font-family:"Manrope",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.6;
  font-feature-settings:"ss01","tnum";
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3{margin:0;letter-spacing:-.028em;line-height:1.1;font-weight:700}
p{margin:0}
a{color:inherit;text-decoration:none}
ol{margin:0;padding:0;list-style:none}
dl,dd,dt{margin:0}

.shell{width:min(var(--shell),calc(100% - 44px));margin-inline:auto}

.skip{position:absolute;left:-9999px;top:12px;z-index:99;background:var(--surface-2);padding:10px 16px;border-radius:10px}
.skip:focus{left:16px}

:focus-visible{outline:2px solid var(--electric);outline-offset:3px;border-radius:8px}

/* ---------- ambient field: iridescent blooms + grain ---------- */
.bg-field{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none;
  background:
    radial-gradient(120% 80% at 78% 8%, rgba(30,42,84,.55), transparent 60%),
    radial-gradient(90% 70% at 8% 96%, rgba(46,26,58,.55), transparent 62%),
    #06080F;}

.orb{position:absolute;border-radius:50%;filter:blur(96px);will-change:transform}
.orb-a{width:760px;height:760px;top:-280px;left:-180px;opacity:.55;
  background:radial-gradient(circle,rgba(91,124,255,.62),transparent 66%);
  animation:drift-a 36s ease-in-out infinite}
.orb-b{width:660px;height:660px;top:120px;right:-240px;opacity:.5;
  background:radial-gradient(circle,rgba(155,140,255,.52),transparent 66%);
  animation:drift-b 46s ease-in-out infinite}
.orb-c{width:940px;height:940px;bottom:-460px;left:34%;opacity:.45;
  background:radial-gradient(circle,rgba(77,163,255,.34),transparent 68%);
  animation:drift-a 56s ease-in-out infinite reverse}
.orb-d{width:620px;height:620px;top:44%;left:-160px;opacity:.34;
  background:radial-gradient(circle,rgba(255,107,155,.42),transparent 64%);
  animation:drift-b 52s ease-in-out infinite}
.orb-e{width:520px;height:520px;bottom:6%;right:-120px;opacity:.24;
  background:radial-gradient(circle,rgba(255,168,120,.4),transparent 64%);
  animation:drift-a 64s ease-in-out infinite}

/* slow iridescent sweep, the ring/aurora quality from the references */
.ribbon{position:absolute;top:-24%;right:-18%;width:1100px;height:1100px;border-radius:46%;
  opacity:.3;filter:blur(70px);mix-blend-mode:screen;
  background:conic-gradient(from 210deg,
    rgba(255,140,180,.55),
    rgba(155,140,255,.6) 22%,
    rgba(77,163,255,.55) 42%,
    rgba(94,230,168,.28) 60%,
    rgba(255,178,120,.36) 78%,
    rgba(255,140,180,.55));
  -webkit-mask:radial-gradient(circle,transparent 41%,#000 54%,#000 76%,transparent 88%);
  mask:radial-gradient(circle,transparent 41%,#000 54%,#000 76%,transparent 88%);
  animation:spin-ribbon 90s linear infinite}

@keyframes spin-ribbon{to{transform:rotate(360deg)}}
@keyframes drift-a{50%{transform:translate3d(90px,70px,0) scale(1.14)}}
@keyframes drift-b{50%{transform:translate3d(-100px,50px,0) scale(1.1)}}

/* film grain over the whole page, like the reference posters */
.grain-layer{position:fixed;inset:-50%;z-index:1;pointer-events:none;opacity:.055;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.78' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grain-shift 7s steps(6) infinite}
@keyframes grain-shift{
  0%{transform:translate3d(0,0,0)}
  20%{transform:translate3d(-4%,3%,0)}
  40%{transform:translate3d(3%,-4%,0)}
  60%{transform:translate3d(-3%,-2%,0)}
  80%{transform:translate3d(4%,2%,0)}
  100%{transform:translate3d(0,0,0)}}

/* ---------- navigation ---------- */
.nav-wrap{position:fixed;top:16px;left:0;right:0;z-index:60;display:flex;justify-content:center}
.nav{
  width:min(var(--shell),calc(100% - 32px));
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:9px 10px 9px 18px;
  border-radius:var(--radius);
  border:1px solid rgba(37,45,64,.9);
  background:var(--glass);
  backdrop-filter:blur(20px) saturate(150%);
  -webkit-backdrop-filter:blur(20px) saturate(150%);
  box-shadow:0 18px 40px -28px rgba(0,0,0,.95);
  transition:background .4s var(--ease),border-color .4s var(--ease),box-shadow .4s var(--ease);
  position:relative;
}
.nav::after{
  content:"";position:absolute;inset:-1px;border-radius:inherit;padding:1px;
  background:linear-gradient(105deg,rgba(91,124,255,.55),rgba(155,140,255,.18) 45%,transparent 72%);
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;
}
.nav.is-stuck{background:var(--glass-strong);box-shadow:0 24px 60px -30px rgba(0,0,0,1)}

.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.02em}
.brand-mark{width:26px;height:26px;overflow:visible}
.brand-mark path{fill:none;stroke:var(--electric);stroke-width:1.8;stroke-linecap:round}
.brand-mark path.faint{stroke:var(--border)}
.brand-mark circle{fill:var(--bg);stroke:var(--blue);stroke-width:1.8}
.brand-mark circle.mid{fill:var(--blue);stroke:var(--blue)}
.brand-mark circle.tip{fill:var(--lavender);stroke:var(--lavender)}
.brand-mark circle.faint-dot{fill:none;stroke:var(--border)}
.brand-name{font-size:16.5px}

.nav-links{display:flex;align-items:center;gap:6px}
.nav-link{
  padding:9px 14px;border-radius:10px;font-size:14.5px;font-weight:500;color:var(--muted);
  transition:color .25s ease,background .25s ease;
}
.nav-link:hover{color:var(--text);background:rgba(255,255,255,.04)}
.nav-link.is-current{color:var(--text)}
.nav-links .btn{margin-left:8px}

.nav-toggle{display:none;width:40px;height:36px;border-radius:10px;background:rgba(255,255,255,.04);
  border:1px solid var(--border);cursor:pointer;padding:0;place-items:center}
.nav-toggle span{display:block;width:16px;height:1.6px;background:var(--text);margin:3px auto;
  transition:transform .3s var(--ease),opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:first-child{transform:translateY(2.3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:last-child{transform:translateY(-2.3px) rotate(-45deg)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:13px 22px;border-radius:12px;
  font-size:15px;font-weight:600;letter-spacing:-.01em;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s var(--ease),border-color .3s var(--ease);
  white-space:nowrap;border:1px solid transparent;cursor:pointer;
}
.btn-sm{padding:10px 16px;font-size:14px}
.btn-lg{padding:16px 28px;font-size:16.5px}
.btn-primary{
  color:#fff;
  background:linear-gradient(115deg,#5B7CFF,#7D7FFF 48%,#9B8CFF);
  box-shadow:0 12px 34px -14px rgba(91,124,255,.9),inset 0 1px 0 rgba(255,255,255,.22);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 20px 44px -14px rgba(123,124,255,.95),inset 0 1px 0 rgba(255,255,255,.3)}
.btn-ghost{
  color:var(--text);background:rgba(255,255,255,.03);border-color:var(--border);
  backdrop-filter:blur(10px);
}
.btn-ghost:hover{border-color:#33405c;background:rgba(255,255,255,.06);transform:translateY(-2px)}
.arrow{transition:transform .3s var(--ease);display:inline-block}
.btn:hover .arrow{transform:translateX(3px)}
.btn:hover .arrow.down{transform:translateY(3px)}

/* ---------- hero ---------- */
.hero{padding:168px 0 152px;position:relative}
.hero-grid{
  display:grid;grid-template-columns:minmax(0,.88fr) minmax(0,1.12fr);
  gap:56px;align-items:center;
}
.hero-kicker{
  font-size:13.5px;color:var(--muted);font-weight:600;letter-spacing:.01em;
  display:inline-flex;align-items:center;gap:9px;margin-bottom:22px;
}
.hero-kicker::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,var(--electric),transparent)}

.hero-title{font-size:clamp(40px,5.2vw,68px);font-weight:800;line-height:1.04;letter-spacing:-.038em}
.hero-title .line{display:block;overflow:hidden;padding-bottom:.06em}
.hero-title .line-in{display:block;transform:translateY(112%);
  transition:transform 1.05s cubic-bezier(.19,1,.22,1);
  transition-delay:calc(var(--l) * 110ms)}
.hero-title.is-in .line-in{transform:none}
.grad-text{
  font-style:normal;
  background:linear-gradient(96deg,#4DA3FF 8%,#7E8DFF 48%,#B8A8FF 92%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{margin-top:24px;max-width:46ch;color:var(--muted);font-size:17.5px;line-height:1.65}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}

.hero-meta{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px 28px;
  margin-top:52px;padding-top:24px;border-top:1px solid rgba(37,45,64,.7);
}
.hero-meta > div{position:relative;padding-left:20px;min-width:0}
.hero-meta > div:first-child{padding-left:0}
.hero-meta > div::before{
  content:"";position:absolute;left:0;top:2px;bottom:2px;width:1px;
  background:linear-gradient(180deg,rgba(91,124,255,.55),rgba(91,124,255,0));
}
.hero-meta > div:first-child::before{display:none}
.hero-meta dt{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;white-space:nowrap}
.hero-meta dd{font-size:16px;font-weight:700;margin-top:7px;letter-spacing:-.015em;line-height:1.35}

/* ---------- hero stage / graph ---------- */
.hero-stage{position:relative}
.stage{position:relative;padding:8px 6px 30px}
.graph{width:100%;height:auto;overflow:visible;display:block}

.edge{
  fill:none;stroke:#26304A;stroke-width:1.4;
  transition:stroke .35s ease,opacity .35s ease,stroke-width .35s ease;
}
.edge.state-done{stroke:rgba(77,163,255,.55)}
.edge.state-active{stroke:url(#edgeLive);stroke-width:1.7}
.edge.is-lit{stroke:url(#edgeLive);stroke-width:2.1;opacity:1}
.edge.is-dim{opacity:.18}

.node{cursor:pointer}
.node .halo{opacity:0;transition:opacity .4s ease}
.node .ring{fill:rgba(11,16,28,.9);stroke:#2E3852;stroke-width:1.5;transition:stroke .3s ease,fill .3s ease}
.node .core{transition:transform .35s var(--ease),opacity .35s ease}
.node .label{
  fill:var(--muted);font-size:11.5px;font-weight:600;text-anchor:middle;
  letter-spacing:.01em;transition:fill .3s ease,opacity .35s ease;
}

.node.state-done .core{fill:url(#nodeDone)}
.node.state-done .ring{stroke:rgba(91,124,255,.5)}
.node.state-done .halo{fill:var(--blue);opacity:.14}
.node.state-done .label{fill:#B7C2DE}

.node.state-active .core{fill:url(#nodeActive)}
.node.state-active .ring{stroke:rgba(155,140,255,.75)}
.node.state-active .halo{fill:var(--lavender);opacity:.16;animation:breathe 3.4s ease-in-out infinite}
.node.state-active .label{fill:#D6D2FF}

.node.state-open .core{fill:none;stroke:var(--electric);stroke-width:2}
.node.state-open .ring{stroke:rgba(77,163,255,.35)}

.node.state-locked .core{fill:#1B2233}
.node.state-locked .ring{stroke:#222B3E}
.node.state-locked .label{fill:#5C667E}

.node.state-degree .core{fill:none;stroke:var(--mint);stroke-width:2}
.node.state-degree .halo{fill:url(#degreeGlow);opacity:.9;animation:breathe 5s ease-in-out infinite}
.node.state-degree .label{fill:var(--mint)}

.node.is-lit .halo{opacity:.34}
.node.is-lit .ring{stroke:rgba(155,140,255,.8)}
.node.is-lit .label{fill:var(--text)}
.node.is-dim{opacity:.24}
.node.is-hover .core{transform:scale(1.28)}
.node .core{transform-box:fill-box;transform-origin:center}

@keyframes breathe{0%,100%{opacity:.12}50%{opacity:.34}}

/* intro sequencing */
.graph .node{opacity:0;transform:translateY(7px);
  transition:opacity .6s var(--ease),transform .6s var(--ease)}
.graph .node-pos{transform-box:view-box}
.graph .node.is-on{opacity:1;transform:none}
.graph.is-ready .node.is-dim{opacity:.24}

.node-card{
  position:absolute;top:0;left:0;z-index:5;pointer-events:none;
  display:grid;gap:2px;min-width:186px;
  padding:13px 15px;border-radius:14px;
  background:var(--glass-strong);
  border:1px solid rgba(60,74,110,.9);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  box-shadow:0 26px 50px -26px rgba(0,0,0,1);
  opacity:0;transform:translate(-50%,-104%) scale(.97);
  transition:opacity .22s ease,transform .28s var(--ease);
}
.node-card.is-visible{opacity:1;transform:translate(-50%,-100%) scale(1)}
.node-card-code{font-size:14px;font-weight:700;letter-spacing:-.01em}
.node-card-name{font-size:13px;color:#C3CBDE}
.node-card-state{font-size:12.5px;color:var(--electric);margin-top:6px}
.node-card-unlock{font-size:12.5px;color:var(--muted)}
.node-card[data-state="locked"] .node-card-state{color:#7E88A0}
.node-card[data-state="degree"] .node-card-state{color:var(--mint)}
.node-card[data-state="active"] .node-card-state{color:var(--lavender)}

.stage-hint{
  position:absolute;bottom:-4px;right:8px;font-size:12.5px;color:#616B84;
  transition:opacity .4s ease;max-width:70%;
}
.stage-hint.is-hidden{opacity:0}

/* ---------- product panel ---------- */
.panel{
  position:absolute;left:-38px;bottom:-98px;width:292px;
  padding:18px;border-radius:var(--radius-l);
  background:linear-gradient(160deg,rgba(23,29,45,.92),rgba(14,19,32,.9));
  backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);
  box-shadow:0 40px 80px -40px rgba(0,0,0,1);
  border:1px solid transparent;
  animation:float-panel 9s ease-in-out infinite;
}
.panel::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(140deg,rgba(91,124,255,.75),rgba(155,140,255,.35) 46%,rgba(37,45,64,.6));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;
}
@keyframes float-panel{50%{transform:translateY(-9px)}}

.panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}
.panel-label{font-size:12px;color:var(--muted)}
.panel-major{font-size:15px;font-weight:700;margin-top:2px}
.panel-tag{
  font-size:11.5px;font-weight:600;color:var(--mint);
  padding:4px 9px;border-radius:999px;
  background:rgba(94,230,168,.09);border:1px solid rgba(94,230,168,.24);
}
.panel-progress{margin-top:18px}
.panel-figures{display:flex;align-items:baseline;gap:7px}
.panel-figures strong{font-size:30px;font-weight:800;letter-spacing:-.03em}
.panel-figures span{font-size:13px;color:var(--muted)}
.bar{height:6px;border-radius:99px;background:#1B2233;margin-top:10px;overflow:hidden}
.bar i{display:block;height:100%;width:var(--fill);border-radius:99px;
  background:linear-gradient(90deg,#4DA3FF,#9B8CFF);
  box-shadow:0 0 18px rgba(91,124,255,.55);
  animation:fill-bar 1.6s var(--ease) both .9s}
@keyframes fill-bar{from{width:0}}

.panel-stats{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px;
  padding-top:14px;border-top:1px solid rgba(37,45,64,.9)}
.panel-stats span{display:block;font-size:11.5px;color:var(--muted)}
.panel-stats strong{font-size:14px;font-weight:600}

.mini-path{width:100%;height:auto;margin-top:14px;overflow:visible}
.mini-line{fill:none;stroke:#28324a;stroke-width:1.6}
.mini-line-lit{stroke:url(#edgeSweep);stroke-width:2;
  stroke-dasharray:240;stroke-dashoffset:240;animation:draw 2.4s var(--ease) forwards 1.1s}
@keyframes draw{to{stroke-dashoffset:0}}
.mini-dot{fill:#141B2B;stroke-width:2}
.mini-dot.done{fill:#4DA3FF;stroke:none}
.mini-dot.live{fill:#9B8CFF;stroke:none}
.mini-dot.next{stroke:#39435E}

/* ---------- generic sections ---------- */
.section{padding:120px 0}
.section-head{max-width:660px}
.section-head h2{font-size:clamp(30px,3.7vw,44px)}
.section-head p{margin-top:18px;color:var(--muted);font-size:17px;max-width:58ch}

.reveal{opacity:0;transform:translateY(16px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ---------- problem: pinned presentation ---------- */
.problem{padding-bottom:40px}
.problem-shell{display:grid;grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);gap:64px;align-items:start}
.problem-head{position:sticky;top:140px;max-width:440px}
.problem-head h2{font-size:clamp(30px,3.7vw,44px)}
.problem-head p{margin-top:18px;color:var(--muted);font-size:17px;max-width:58ch}

.problem-pin{position:relative;min-height:100vh;display:flex;align-items:center;padding:64px 0}
.problem-row{display:flex;align-items:center;gap:44px;width:100%}
.problem-stack{position:relative;flex:1 1 auto;min-width:0;width:100%;
  display:grid;gap:20px}
.problem-stack.is-staged{gap:0;perspective:1500px}
.problem-stack.is-staged .p-card{grid-column:1;grid-row:1;margin:0;backface-visibility:hidden}

.p-card{
  position:relative;padding:36px 34px 38px;border-radius:var(--radius-l);
  background:linear-gradient(165deg,rgba(24,30,47,.84),rgba(12,17,29,.88));
  border:1px solid transparent;overflow:hidden;
  box-shadow:0 30px 64px -42px rgba(0,0,0,.95);
  transition:box-shadow .5s ease;
}
.p-card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(150deg,rgba(91,124,255,.38),rgba(155,140,255,.14) 45%,rgba(37,45,64,.5));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;
  transition:background .5s ease;
}
.p-card.is-active{box-shadow:0 46px 100px -38px rgba(91,124,255,.32),0 30px 64px -42px rgba(0,0,0,.95)}
.p-card.is-active::before{background:linear-gradient(150deg,rgba(130,160,255,.85),rgba(178,160,255,.42) 48%,rgba(77,163,255,.28))}

.p-card-index{position:absolute;top:30px;right:34px;font-size:13px;font-weight:700;color:#4A5476;letter-spacing:.06em}
.p-art{width:132px;height:96px;display:block;margin-bottom:24px;overflow:visible}
.p-card h3{font-size:22px}
.p-card p{color:var(--muted);font-size:15.5px;margin-top:12px;max-width:38ch;line-height:1.62}

/* icon 01 — staircase to graduation cap */
.stair{fill:url(#gradPath)}
.stair.s1{opacity:.28}
.stair.s2{opacity:.52}
.stair.s3{opacity:.76}
.stair.s4{opacity:1}
.cap-top{fill:var(--mint)}
.cap-brim{fill:none;stroke:var(--mint);stroke-width:1.4;stroke-linejoin:round;opacity:.8}
.cap-tassel{stroke:var(--mint);stroke-width:1.3}
.cap-bead{fill:var(--mint)}

/* icon 02 — lock + prerequisite nodes */
.p-link{stroke:#2E3855;stroke-width:1.6;fill:none}
.p-link.dim{stroke-dasharray:3 4}
.p-node{stroke-width:2}
.p-node.on{fill:url(#gradPath);stroke:none}
.p-node.off{fill:none;stroke:#39435E}
.p-node.live{fill:#9B8CFF;stroke:none}
.lock-shackle{fill:none;stroke:url(#gradLock);stroke-width:5;stroke-linecap:round;stroke-linejoin:round;
  transform-box:fill-box;transform-origin:50% 100%;transition:transform .6s var(--ease)}
.lock-body{fill:url(#gradLock);opacity:.94}
.lock-hole{fill:#0B0F1A}
.lock-hole-line{stroke:#0B0F1A;stroke-width:3;stroke-linecap:round}
.p-card.is-active .lock-shackle{transform:translateY(-3px) rotate(-8deg)}

/* icon 03 — magnifying glass over a course map */
.map-line{stroke:#2E3855;stroke-width:1.3;fill:none}
.glass-ring{fill:rgba(255,255,255,.03);stroke:url(#gradExplore);stroke-width:3}
.glass-handle{stroke:url(#gradExplore);stroke-width:4;stroke-linecap:round}

.problem-steps{display:flex;flex-direction:column;align-items:center;flex:0 0 auto;padding-top:6px}
.p-step{
  position:relative;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;
  font-size:0;color:#5B6480;background:rgba(255,255,255,.03);border:1px solid var(--border);
  transition:color .4s ease,border-color .4s ease,background .4s ease,transform .4s var(--ease),box-shadow .4s ease;
}
.p-step i{font-style:normal;font-size:11px;font-weight:700}
.p-step:not(:last-child)::after{
  content:"";position:absolute;top:100%;left:50%;width:1px;height:40px;
  background:linear-gradient(180deg,var(--border),transparent);transform:translateX(-50%);
}
.p-step.is-active{
  color:#DCE3FF;border-color:rgba(120,150,255,.6);background:rgba(91,124,255,.16);
  transform:scale(1.14);box-shadow:0 0 0 5px rgba(91,124,255,.12);
}

/* ---------- from confusion to clarity ---------- */
.clarity-shell{display:grid;grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);gap:64px;align-items:start}
.clarity-head{position:sticky;top:140px;max-width:440px}
.clarity-kicker{
  font-size:13.5px;color:var(--muted);font-weight:600;letter-spacing:.01em;
  display:inline-flex;align-items:center;gap:9px;margin-bottom:18px;
}
.clarity-kicker::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,var(--electric),transparent)}
.clarity-head h2{font-size:clamp(26px,3vw,36px)}
.clarity-copy{margin-top:20px;color:var(--muted);font-size:16.5px;line-height:1.65;max-width:40ch}
.clarity-head .btn{margin-top:28px}

.clarity-pin{position:relative}
.clarity-stage{min-height:100vh;display:flex;align-items:center;padding:64px 0}
.clarity-stack{position:relative;width:100%;display:grid;gap:24px}
.clarity-stack.is-staged{gap:0;perspective:1600px}
.clarity-stack.is-staged .f-card{grid-column:1;grid-row:1;margin:0;backface-visibility:hidden}

.f-card{
  border-radius:var(--radius-l);overflow:hidden;
  background:linear-gradient(165deg,rgba(24,30,47,.86),rgba(11,16,27,.9));
  border:1px solid transparent;position:relative;
  box-shadow:0 40px 90px -46px rgba(0,0,0,.95);
  transition:box-shadow .5s ease;
  min-height:320px;display:flex;
}
.f-card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
  background:linear-gradient(150deg,rgba(91,124,255,.4),rgba(155,140,255,.16) 45%,rgba(37,45,64,.5));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none;
  transition:background .5s ease;
}
.f-card.is-active{box-shadow:0 56px 120px -40px rgba(91,124,255,.3),0 40px 90px -46px rgba(0,0,0,.95)}
.f-card.is-active::before{background:linear-gradient(150deg,rgba(130,160,255,.85),rgba(178,160,255,.42) 48%,rgba(77,163,255,.28))}

.f-card-body{
  position:relative;width:100%;padding:56px 60px;
  display:flex;flex-direction:column;justify-content:center;gap:14px;
}
.f-card-num{font-size:14px;font-weight:700;color:#7583A6;letter-spacing:.08em}
.f-card-body h3{font-size:28px}
.f-card-body p{color:var(--muted);font-size:16.5px;max-width:46ch;line-height:1.65}

.clarity-dots{display:flex;justify-content:center;gap:9px;margin-top:26px}
.clarity-dots.is-staged{position:absolute;left:50%;bottom:-46px;transform:translateX(-50%);margin-top:0}
.c-dot{width:7px;height:7px;border-radius:50%;background:#2E3855;transition:background .4s ease,transform .4s ease}
.c-dot.is-active{background:var(--electric);transform:scale(1.4)}

/* ---------- final CTA ---------- */
.cta-section{position:relative;padding:150px 0 160px;overflow:hidden;text-align:center;
  border-top:1px solid rgba(37,45,64,.55)}
.cta-net{position:absolute;inset:0;width:100%;height:100%;opacity:.6}
.cta-net line{stroke:#232D45;stroke-width:1}
.cta-net circle{fill:#38466B}
.cta-net circle.lit{fill:#5B7CFF;animation:twinkle 6s ease-in-out infinite}
@keyframes twinkle{0%,100%{opacity:.35}50%{opacity:1}}
.cta-section::after{
  content:"";position:absolute;left:50%;top:50%;width:900px;height:540px;
  transform:translate(-50%,-50%);pointer-events:none;
  background:radial-gradient(ellipse,rgba(91,124,255,.22),rgba(155,140,255,.08) 45%,transparent 70%);
  filter:blur(30px);
}
.cta-inner{position:relative;z-index:2;display:grid;justify-items:center}
.cta-inner h2{font-size:clamp(32px,4.6vw,56px);max-width:16ch}
.cta-inner p{margin-top:18px;color:var(--muted);font-size:18px}
.cta-inner .btn{margin-top:34px}

/* ---------- footer ---------- */
.footer{padding:38px 0 46px;border-top:1px solid rgba(37,45,64,.6)}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.footer-links{display:flex;gap:22px;flex-wrap:wrap}
.footer-links a{color:var(--muted);font-size:14.5px;transition:color .25s ease}
.footer-links a:hover{color:var(--text)}
.footer-note{color:#596076;font-size:13.5px}

/* ============================================================
   Scroll progress indicator
   ============================================================ */
.progress-rail{
  position:fixed;left:26px;top:50%;transform:translateY(-50%);z-index:55;
  display:flex;flex-direction:column;align-items:center;gap:14px;
  pointer-events:none;
}
.progress-track{position:relative;width:1px;height:168px;background:rgba(140,155,200,.14);border-radius:1px}
.progress-fill{
  position:absolute;left:0;top:0;width:100%;height:0%;border-radius:1px;
  background:linear-gradient(180deg,#4DA3FF,#9B8CFF);
  box-shadow:0 0 10px rgba(91,124,255,.6);
}
.progress-dots{
  position:absolute;top:0;left:50%;height:168px;width:1px;margin:0;padding:0;list-style:none;
}
.progress-dots li{
  position:absolute;top:calc(var(--p) * 168px);left:50%;transform:translate(-50%,-50%);
  width:5px;height:5px;border-radius:50%;background:#3A4460;
  transition:background .4s ease,transform .4s var(--ease),box-shadow .4s ease;
}
.progress-dots li.is-active{
  background:var(--electric);transform:translate(-50%,-50%) scale(1.7);
  box-shadow:0 0 10px rgba(77,163,255,.7);
}

.progress-bar-mobile{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:65;background:rgba(140,155,200,.12);
  display:none;
}
.progress-bar-mobile i{display:block;height:100%;width:0%;
  background:linear-gradient(90deg,#4DA3FF,#9B8CFF,#FF8FC0)}

@media (max-width:900px){
  .progress-rail{display:none}
  .progress-bar-mobile{display:block}
}
@media (prefers-reduced-motion:reduce){
  .progress-fill,.progress-bar-mobile i{transition:none}
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr;gap:80px}
  .hero-copy{max-width:640px}
  .hero-stage{margin-top:8px}
  .panel{position:relative;left:auto;bottom:auto;width:min(320px,100%);margin:26px auto 0}
  .stage-hint{position:static;margin-top:10px;max-width:none}
}

@media (max-width:860px){
  .section{padding:96px 0}

  /* problem + clarity fall back to a simple vertical scroll sequence —
     no pin, no 3D stack; ScrollTrigger is not initialised at this width */
  .problem{padding-bottom:0}
  .problem-shell{grid-template-columns:1fr;gap:32px}
  .problem-head{position:static;top:auto;max-width:none}
  .problem-pin{min-height:0;padding:0;display:block}
  .problem-row{flex-direction:column;align-items:stretch;gap:32px}
  .problem-stack{max-width:none;flex:none}
  .p-card{padding:28px 26px 30px}
  .problem-steps{flex-direction:row;justify-content:flex-start;gap:0;padding-top:0}
  .p-step:not(:last-child)::after{
    top:50%;left:100%;width:34px;height:1px;transform:translateY(-50%);
    background:linear-gradient(90deg,var(--border),transparent);
  }

  .clarity-shell{grid-template-columns:1fr;gap:40px}
  .clarity-head{position:static;top:auto;max-width:none}
  .clarity-pin{min-height:0}
  .clarity-stage{min-height:0;padding:0;display:block}
  .clarity-stack{gap:22px}
  .clarity-dots{display:none}
  .f-card{min-height:0}
  .f-card-body{padding:34px 28px}
  .f-card-body h3{font-size:23px}
}

@media (max-width:760px){
  .hero{padding:132px 0 72px}
  .nav-toggle{display:grid}
  .nav-links{
    position:absolute;top:calc(100% + 10px);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:2px;padding:12px;
    border-radius:var(--radius);border:1px solid var(--border);
    background:var(--glass-strong);backdrop-filter:blur(20px);
    box-shadow:0 30px 60px -30px rgba(0,0,0,1);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:opacity .3s ease,transform .3s var(--ease),visibility .3s;
  }
  .nav-links.is-open{opacity:1;visibility:visible;transform:none}
  .nav-links .btn{margin:8px 0 0;justify-content:center}
  .nav-link{padding:12px 14px}
  .hero-meta{grid-template-columns:1fr;gap:16px}
  .hero-meta > div{padding-left:0;padding-top:14px;border-top:1px solid rgba(37,45,64,.55)}
  .hero-meta > div::before{display:none}
  .hero-meta > div:first-child{padding-top:0;border-top:none}
  .node-card{min-width:160px}
}

@media (max-width:520px){
  .shell{width:calc(100% - 32px)}
  .hero-sub{font-size:16px}
  .hero-meta dd{font-size:17px}
  .cta-section{padding:110px 0 118px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
  .graph .node{opacity:1;transform:none}
  .mini-line-lit{stroke-dashoffset:0}
  .mask>span{transform:none}
  .hero-title .line-in{transform:none}
  .p-card,.f-card{opacity:1!important;transform:none!important}
  .problem-stack.is-staged .p-card,.clarity-stack.is-staged .f-card{grid-column:auto!important;grid-row:auto!important;margin-bottom:20px}
  .lock-shackle{transition:none}
}

/* ============================================================
   Preloader
   ============================================================ */
html.is-loading{overflow:hidden}
.preloader{
  position:fixed;inset:0;z-index:200;background:#06080F;
  display:grid;place-items:center;gap:0;
  transition:transform .9s cubic-bezier(.76,0,.24,1),opacity .6s ease;
}
.preloader.is-done{transform:translateY(-101%)}

.pre-scene{
  position:relative;width:min(58vw,420px);aspect-ratio:1;
  display:grid;place-items:center;
}
.pre-rings{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.pre-ring{fill:none;stroke:rgba(140,155,200,.14);stroke-width:1}

.pre-orbit{position:absolute;inset:0;border-radius:50%;pointer-events:none}
.pre-orbit-1{width:40%;height:40%;top:30%;left:30%}
.pre-orbit-2{width:62.5%;height:62.5%;top:18.75%;left:18.75%}
.pre-orbit-3{width:85%;height:85%;top:7.5%;left:7.5%}

.pre-node{
  position:absolute;top:0;left:50%;width:9px;height:9px;border-radius:50%;
  transform:translate(-50%,-50%);
  box-shadow:0 0 16px 2px currentColor;
}
.pre-node-mint{background:var(--mint);color:rgba(94,230,168,.7)}
.pre-node-blue{background:var(--electric);color:rgba(77,163,255,.7)}
.pre-node-lav{background:var(--lavender);color:rgba(155,140,255,.7);
  top:auto;bottom:0;left:50%;transform:translate(-50%,50%)}
.pre-node-pink{background:#FF8FC0;color:rgba(255,143,192,.6);width:6px;height:6px}

.pre-center{position:relative;z-index:2;display:grid;justify-items:center;gap:8px;text-align:center}
.pre-word{
  font-size:clamp(26px,4vw,36px);font-weight:800;letter-spacing:-.03em;color:var(--text);
  background:linear-gradient(96deg,#F5F7FF,#C9D3F5 55%,#9FB0F0);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.pre-tag{font-size:13px;color:var(--muted);letter-spacing:.02em}

.pre-foot{
  position:fixed;left:0;right:0;bottom:0;display:flex;align-items:center;gap:16px;
  padding:0 clamp(22px,5vw,64px) 30px;
}
.pre-bar{flex:1;height:1px;background:rgba(255,255,255,.1)}
.pre-bar i{display:block;height:100%;width:0;
  background:linear-gradient(90deg,#4DA3FF,#9B8CFF,#FF8FC0)}
.pre-count{display:flex;align-items:baseline;gap:2px;
  font-size:15px;font-weight:700;letter-spacing:-.01em;color:var(--muted);
  font-variant-numeric:tabular-nums;min-width:34px;justify-content:flex-end}
.pre-count i{font-style:normal;font-size:.85em}
.pre-bar i{display:block;height:100%;width:0;
  background:linear-gradient(90deg,#4DA3FF,#9B8CFF,#FF8FC0);
  transition:width .18s linear}

/* ============================================================
   Masked heading reveals
   ============================================================ */
.mask{overflow:hidden}
.mask > span{display:block;transform:translateY(110%);
  transition:transform 1s cubic-bezier(.19,1,.22,1)}
.reveal.is-in .mask > span,.mask.is-in > span{transform:none}
.cta-head .cta-line:nth-child(2){transition-delay:.1s}

/* ============================================================
   Prerequisite ticker
   ============================================================ */
.ticker{
  position:relative;overflow:hidden;padding:20px 0;
  border-top:1px solid rgba(37,45,64,.6);border-bottom:1px solid rgba(37,45,64,.6);
  -webkit-mask:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
  mask:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
}
.ticker-track{display:flex;width:max-content;gap:0;animation:ticker 42s linear infinite}
.ticker:hover .ticker-track{animation-play-state:paused}
.ticker-item{display:inline-flex;align-items:center;gap:10px;padding:0 26px;
  font-size:14px;font-weight:600;color:#7C86A0;letter-spacing:.01em}
.ticker-item .tick-arrow{color:#5B7CFF}
.ticker-item .tick-dot{display:inline-block;width:4px;height:4px;border-radius:50%;background:#2E3855;margin-left:22px}
@keyframes ticker{to{transform:translateX(-50%)}}

/* ============================================================
   Magnetic buttons
   ============================================================ */
.magnetic{will-change:transform;transition:transform .5s cubic-bezier(.19,1,.22,1),box-shadow .3s var(--ease),background .3s var(--ease),border-color .3s var(--ease)}
.magnetic .arrow{pointer-events:none}

@media (max-width:760px){
  .pre-scene{width:min(74vw,320px)}
  .ticker{padding:16px 0}
  .ticker-item{font-size:13px;padding:0 18px}
}