:root{
  --indigo:#4F46E5;
  --indigo-dark:#3730A3;
  --navy:#1E1B4B;
  --sky:#EEF2FF;
  --sky-deep:#E0E7FF;
  --orange:#FB923C;
  --orange-dark:#EA7A1F;
  --coral:#F43F5E;
  --teal:#14B8A6;
  --amber:#F59E0B;
  --ink:#1E1B4B;
  --muted:#5B5B7A;
  --faint:#9A9AB5;
  --line:#E6E6F2;
  --sans:"Nunito",-apple-system,"Segoe UI",sans-serif;
  --r:18px;
  --shadow:0 12px 32px rgba(79,70,229,.12);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
::selection{background:var(--indigo);color:#fff}
a{color:inherit;text-decoration:none}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
section{scroll-margin-top:78px;padding:84px 0;position:relative}
.dots{background-image:radial-gradient(#C7D2FE 1.6px, transparent 1.6px);background-size:24px 24px}

/* ---------- buttons / chips ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--sans);font-size:.92rem;font-weight:800;padding:14px 32px;border-radius:999px;
  border:none;cursor:pointer;transition:transform .18s,box-shadow .18s,background .18s;white-space:nowrap;
}
.btn:active{transform:scale(.97)}
.btn-indigo{background:var(--indigo);color:#fff;box-shadow:0 8px 20px rgba(79,70,229,.35)}
.btn-indigo:hover{background:var(--indigo-dark)}
.btn-orange{background:var(--orange);color:#fff;box-shadow:0 8px 20px rgba(251,146,60,.4)}
.btn-orange:hover{background:var(--orange-dark)}
.btn-white{background:#fff;color:var(--indigo);box-shadow:0 8px 20px rgba(30,27,75,.15)}
.btn-ghost{background:transparent;color:var(--indigo);border:2px solid var(--indigo);box-shadow:none}
.btn-ghost:hover{background:var(--indigo);color:#fff}
.chip{
  display:inline-flex;align-items:center;gap:8px;font-size:.72rem;font-weight:800;letter-spacing:.14em;
  text-transform:uppercase;padding:8px 18px;border-radius:999px;margin-bottom:20px;
}
.chip-indigo{background:var(--sky);color:var(--indigo)}
.chip-orange{background:#FFF3E8;color:var(--orange-dark)}
.chip .dot{width:8px;height:8px;border-radius:50%;background:currentColor}

/* ---------- header ---------- */
header{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{width:16%; display: inline-block;}
.logo img{width:100%}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a.nl{font-size:.86rem;font-weight:700;color:var(--ink);transition:color .15s}
.nav-links a.nl:hover{color:var(--indigo)}
.nav-links .btn{padding:11px 26px;font-size:.8rem}
.hamburger{display:none;background:#fff;border:2px solid var(--line);border-radius:12px;color:var(--ink);font-size:1.15rem;padding:6px 13px;cursor:pointer;font-family:var(--sans)}

/* ---------- hero ---------- */
.hero{background:var(--sky);padding:150px 0 0;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:center;padding-bottom:70px}
.hero h1{font-weight:900;font-size:clamp(2.3rem,4.6vw,3.6rem);line-height:1.12;letter-spacing:-.02em;margin-bottom:18px;color:var(--navy)}
.hero h1 .hl{color:var(--indigo);position:relative;white-space:nowrap}
.hero h1 .hl svg{position:absolute;left:0;bottom:-.18em;width:100%;height:.32em;overflow:visible}
.hero h1 .hl path{stroke:var(--orange);stroke-width:7;fill:none;stroke-linecap:round}
.lede{color:var(--muted);font-size:1.02rem;margin-bottom:30px;max-width:46ch}
.lede strong{color:var(--ink)}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:26px}
.trust{display:flex;align-items:center;gap:14px;flex-wrap:wrap;font-size:.82rem;font-weight:700;color:var(--muted)}
.trust .stars{color:var(--amber);letter-spacing:.15em}
.trust .avatars{display:flex}
.trust .avatars span{width:34px;height:34px;border-radius:50%;border:3px solid #fff;margin-left:-10px;display:inline-flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:900;color:#fff}
.trust .avatars span:first-child{margin-left:0}

/* hero art : floating UI cards */
.hero-art{position:relative;min-height:440px}
.blob{position:absolute;inset:5% 0;background:var(--sky-deep);border-radius:46% 54% 52% 48%/48% 46% 54% 52%;opacity:.7}
.hero-art .dots{position:absolute;inset:0;opacity:.8}
.float-card{
  position:absolute;background:#fff;border-radius:var(--r);box-shadow:var(--shadow);
  padding:18px 20px;animation:float 5s ease-in-out infinite;
}
@keyframes float{50%{transform:translateY(-12px)}}
.fc-progress{top:6%;right:4%;display:flex;align-items:center;gap:14px;animation-delay:.6s}
.fc-progress .t1{font-size:1.5rem;font-weight:900;color:var(--indigo)}
.fc-progress .t2{font-size:.72rem;font-weight:700;color:var(--muted)}
.fc-check{top:34%;left:0;animation-delay:1.4s;min-width:230px}
.fc-check h4{font-size:.82rem;font-weight:800;margin-bottom:10px}
.fc-check li{list-style:none;font-size:.76rem;color:var(--muted);display:flex;align-items:center;gap:8px;padding:5px 0;font-weight:600}
.fc-check .ck{width:20px;height:20px;border-radius:50%;flex:none;display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:.65rem;font-weight:900}
.spark{position:absolute;font-weight:900;color:var(--orange);animation:float 4s ease-in-out infinite}
.spark.s1{top:2%;left:22%;font-size:1.6rem}
.spark.s2{bottom:22%;left:8%;font-size:1.2rem;color:var(--coral);animation-delay:1s}
.spark.s3{top:44%;right:2%;font-size:1.1rem;color:var(--teal);animation-delay:2s}
.big-pi{position:absolute;bottom:-4%;left:16%;font-size:9rem;font-weight:900;color:var(--indigo);opacity:.08;line-height:1;user-select:none}
.wave{display:block;width:100%;height:70px;margin-bottom:-1px}

/* ---------- stats ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat{
  background:#fff;border-radius:var(--r);padding:28px 24px;text-align:center;
  box-shadow:var(--shadow);border-top:5px solid var(--indigo);
}
.stat:nth-child(2){border-top-color:var(--orange)}
.stat:nth-child(3){border-top-color:var(--teal)}
.stat:nth-child(4){border-top-color:var(--coral)}
.stat .n{font-size:2.1rem;font-weight:900;color:var(--navy);font-variant-numeric:tabular-nums}
.stat .l{font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:4px}

/* ---------- chapters marquee ---------- */
.chapters{background:#fff;padding:0 0 84px}
.mq-label{text-align:center;font-size:.72rem;font-weight:800;letter-spacing:.2em;text-transform:uppercase;color:var(--faint);margin-bottom:18px}
.marquee{overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marquee-track{display:flex;gap:14px;width:max-content;animation:scroll 32s linear infinite;padding:6px 0}
.marquee:hover .marquee-track{animation-play-state:paused}
.mq-chip{
  display:flex;align-items:center;gap:10px;padding:13px 24px;border-radius:999px;white-space:nowrap;
  font-size:.85rem;font-weight:800;background:var(--sky);color:var(--indigo-dark);border:2px solid transparent;
}
.mq-chip:nth-child(4n+2){background:#FFF3E8;color:#C05E10}
.mq-chip:nth-child(4n+3){background:#E6FBF8;color:#0E7C72}
.mq-chip:nth-child(4n+4){background:#FFE9EC;color:#C22A44}
.mq-chip .mdot{width:9px;height:9px;border-radius:50%;background:currentColor;flex:none}
@keyframes scroll{to{transform:translateX(-50%)}}

/* ---------- section headers ---------- */
.sec-head{text-align:center;max-width:640px;margin:0 auto 48px}
.sec-head h2{font-weight:900;font-size:clamp(1.7rem,3.2vw,2.4rem);letter-spacing:-.02em;color:var(--navy);margin-bottom:12px}
.sec-head p{color:var(--muted);font-size:.95rem}

/* ---------- feature cards : colored top border + icon tile ---------- */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feat{
  background:#fff;border-radius:var(--r);box-shadow:var(--shadow);padding:32px 28px;
  border-top:5px solid var(--indigo);transition:transform .2s;
}
.feat:hover{transform:translateY(-6px)}
.feat.c-orange{border-top-color:var(--orange)}
.feat.c-teal{border-top-color:var(--teal)}
.feat.c-coral{border-top-color:var(--coral)}
.feat .tile{
  width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  margin-bottom:20px;background:var(--indigo);
}
.feat.c-orange .tile{background:var(--orange)}
.feat.c-teal .tile{background:var(--teal)}
.feat.c-coral .tile{background:var(--coral)}
.feat .tile svg{width:26px;height:26px;stroke:#fff;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.feat h3{font-size:1.02rem;font-weight:800;margin-bottom:8px;color:var(--navy)}
.feat p{font-size:.85rem;color:var(--muted)}

/* ---------- waitlist panel ---------- */
.cta-panel{background:var(--indigo);border-radius:28px;padding:60px 56px;color:#fff;position:relative;overflow:hidden;box-shadow:0 24px 60px rgba(79,70,229,.35)}
.cta-panel .dots{position:absolute;inset:0;opacity:.25;background-image:radial-gradient(rgba(255,255,255,.5) 1.6px, transparent 1.6px)}
.cta-panel{text-align:center}
.cta-panel>*{position:relative}
.cta-panel h2{font-weight:900;font-size:clamp(1.7rem,3.4vw,2.5rem);letter-spacing:-.02em;margin-bottom:10px}
.cta-panel>p{color:#D9D7FF;margin:0 auto 28px;max-width:52ch}
.waitlist{display:grid;grid-template-columns:1fr 1fr;gap:12px;max-width:640px;margin:0 auto 14px;text-align:left}
.waitlist input,.waitlist select{
  width:100%;background:#fff;border:none;border-radius:999px;color:var(--ink);
  font-family:var(--sans);font-size:.9rem;font-weight:600;padding:15px 22px;outline:none;
  appearance:none;-webkit-appearance:none;
}
.waitlist select{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%234F46E5' stroke-width='2.4'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 22px center;cursor:pointer;grid-column:1/-1;
}
.waitlist select:invalid{color:var(--faint)}
.waitlist input::placeholder{color:var(--faint)}
.waitlist .btn{grid-column:1/-1}
.form-note{font-size:.76rem;color:#C9C7F5;text-align:center}
.form-error{font-size:.82rem;font-weight:800;margin:10px auto 0;display:none;color:#fff;background:rgba(0,0,0,.25);border-radius:12px;padding:10px 18px;max-width:640px;text-align:left}
.form-error.show{display:block}
.form-success{display:none;background:#fff;color:var(--ink);border-radius:18px;padding:22px 26px;font-size:.9rem;max-width:640px;margin:4px auto 0;text-align:left}
.form-success.show{display:block}
.form-success .ok{font-weight:900;color:var(--indigo)}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.step{background:#fff;border-radius:var(--r);box-shadow:var(--shadow);padding:34px 28px;border-top:5px solid var(--teal);position:relative}
.step:nth-child(2){border-top-color:var(--orange)}
.step:nth-child(3){border-top-color:var(--coral)}
.step:nth-child(4){border-top-color:var(--indigo)}
.step .n{
  width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-weight:900;font-size:1.2rem;color:#fff;background:var(--teal);margin-bottom:20px;
}
.step:nth-child(2) .n{background:var(--orange)}
.step:nth-child(3) .n{background:var(--coral)}
.step:nth-child(4) .n{background:var(--indigo)}
.step h3{font-size:.98rem;font-weight:800;margin-bottom:10px;color:var(--navy)}
.step p{font-size:.83rem;color:var(--muted)}

/* ---------- countdown : dark navy band ---------- */
#launch{background:var(--navy);color:#fff}
#launch .sec-head h2{color:#fff}
#launch .sec-head p{color:#B9B8D9}
.countdown{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-top:10px}
.cd-cell{background:rgba(255,255,255,.07);border:2px solid rgba(255,255,255,.16);border-radius:20px;padding:26px 10px;min-width:120px;flex:1;max-width:170px;text-align:center}
.cd-cell .v{font-weight:900;font-size:2.6rem;color:#fff;font-variant-numeric:tabular-nums}
.cd-cell .u{font-size:.64rem;font-weight:800;letter-spacing:.22em;text-transform:uppercase;color:#B9B8D9;margin-top:6px}
#launch .cta-row{text-align:center;margin-top:36px}

/* ---------- testimonials ---------- */
.quotes{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.quote{background:#fff;border-radius:var(--r);box-shadow:var(--shadow);padding:34px 30px;display:flex;flex-direction:column;gap:16px;border-top:5px solid var(--amber)}
.quote:nth-child(2){border-top-color:var(--teal)}
.quote:nth-child(3){border-top-color:var(--coral)}
.quote .stars{color:var(--amber);letter-spacing:.2em}
.quote blockquote{font-size:.95rem;line-height:1.65;color:#333}
.quote .who{font-size:.78rem;color:var(--muted);display:flex;align-items:center;margin-top:auto}
.quote .avatar{width:44px;height:44px;border-radius:50%;flex:none;display:inline-flex;align-items:center;justify-content:center;font-weight:900;color:#fff;margin-right:12px}
.quote .who b{color:var(--navy)}

/* ---------- footer ---------- */
footer{background:var(--navy);color:#C9C7F5;padding:44px 0 30px;font-size:.82rem}
.foot-top{display:flex;flex-direction:row;gap:26px;margin-bottom:28px}
.foot-brand p{max-width:36ch;margin-top:10px;color:#9A99C4}
.foot-links{display:flex;gap:44px;flex-wrap:wrap;flex-direction: row-reverse;width: 50%;}
.foot-links h5{font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;color:#fff;margin-bottom:12px}
.foot-links a{display:block;padding:5px 0;color:#B9B8D9;font-weight:600}
.foot-links a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.14);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.74rem;color:#8B8AC0}
.foot-brand .logo {
    width: 22%;
}
/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .marquee-track,.float-card,.spark{animation:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media (max-width:1020px){
  .hero-grid{grid-template-columns:1fr}
  .hero-art{min-height:380px}
  .steps{grid-template-columns:repeat(2,1fr)}
  .quotes{grid-template-columns:1fr;max-width:620px;margin:0 auto}
  .feat-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav-links{display:none;position:absolute;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;
    background:#fff;border-bottom:1px solid var(--line);padding:10px 24px 22px;gap:0}
  .nav-links.open{display:flex}
  .nav-links a.nl{padding:14px 0;border-bottom:1px solid var(--line)}
  .nav-links .btn{margin-top:14px;text-align:center}
  .hamburger{display:block}
}
@media (max-width:640px){
  section{padding:60px 0}
  .hero{padding:124px 0 0}
  .hero-grid{padding-bottom:50px}
  .waitlist{grid-template-columns:1fr}
  .cta-panel{padding:40px 26px}
  .stats{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr}
  .feat-grid{grid-template-columns:1fr}
  .cd-cell{min-width:calc(50% - 16px)}
  .hero-art{min-height:320px}
  .big-pi{font-size:6rem}
}

/* ---------- privacy policy ---------- */
.policy-body{background:var(--sky)}
.paper{background:#fff;border-radius:24px;padding:56px 52px;margin:48px 0 64px;box-shadow:0 12px 32px rgba(79,70,229,.12)}
.paper .eyebrow{display:inline-block;font-size:.68rem;font-weight:800;letter-spacing:.18em;text-transform:uppercase;background:var(--sky);color:var(--indigo);border-radius:999px;padding:8px 18px;margin-bottom:16px}
.paper h1{font-weight:900;font-size:2.2rem;letter-spacing:-.02em;margin-bottom:6px}
.paper .updated{font-size:.76rem;color:var(--faint);margin-bottom:28px;font-weight:700}
.paper h2{font-size:1.05rem;font-weight:800;margin:28px 0 10px;padding-top:22px;border-top:2px solid var(--sky)}
.paper p,.paper li{font-size:.92rem;color:#3A3A55;margin-bottom:12px}
.paper ul{padding-left:20px}
.back-home{font-size:.78rem;font-weight:800;border:2px solid var(--indigo);color:var(--indigo);border-radius:999px;padding:10px 24px}
.back-home:hover{background:var(--indigo);color:#fff}
@media (max-width:620px){.paper{padding:36px 24px}}


.for-teachers{font-size:.6rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;background:var(--orange);color:#fff;border-radius:999px;padding:6px 12px;vertical-align:middle;margin-left:8px;white-space:nowrap}

.nav-auth{display:flex;gap:10px;align-items:center}

/* ---------- auth : sign up / sign in ---------- */
.auth-page{background:var(--sky);padding:150px 0 90px;min-height:100vh}
.auth-card{background:#fff;border-radius:24px;box-shadow:var(--shadow);max-width:480px;margin:0 auto;padding:48px 44px;text-align:center}
.auth-card h1{font-weight:900;font-size:1.9rem;letter-spacing:-.02em;color:var(--navy);margin-bottom:8px}
.auth-sub{color:var(--muted);font-size:.9rem;margin-bottom:28px}
.field{margin-bottom:16px;text-align:left}
.field label{display:block;font-size:.76rem;font-weight:800;color:var(--navy);margin-bottom:6px}
.field input{width:100%;border:2px solid var(--line);border-radius:14px;padding:13px 18px;font-family:var(--sans);font-size:.92rem;font-weight:600;color:var(--ink);outline:none;background:#fff;transition:border-color .15s,box-shadow .15s}
.field input:focus{border-color:var(--indigo);box-shadow:0 0 0 3px rgba(79,70,229,.12)}
.field.err input{border-color:var(--coral);box-shadow:0 0 0 3px rgba(244,63,94,.12)}
.field .fmsg{display:none;font-size:.74rem;font-weight:700;color:var(--coral);margin-top:6px}
.field.err .fmsg{display:block}
.auth-success{display:none;background:var(--sky);border-radius:16px;padding:24px 22px;font-size:.9rem;color:var(--muted);margin-top:6px}
.auth-success .ok{font-weight:900;color:var(--indigo);font-size:1.02rem;margin-bottom:6px}
.auth-alt{margin-top:22px;font-size:.85rem;color:var(--muted)}
.auth-alt a{color:var(--indigo);font-weight:800}
@media (max-width:860px){.nav-auth{margin-top:6px;flex-wrap:wrap}}
@media (max-width:640px){.auth-card{padding:36px 24px}.auth-page{padding:124px 0 60px}}

/* ---------- header logo : mobile portrait & landscape ---------- */
@media (max-width:860px) and (orientation:portrait){
  .logo{width:38%}

  .foot-top
  {
    flex-direction: column;
  }

  .foot-links
  {
    flex-direction: row;
    width: 100%;
  }
}
@media (max-width:860px) and (orientation:landscape){
  .logo{width:18%}
.foot-top
  {
    flex-direction: column;
  }

  .foot-links
  {
    flex-direction: row;
    width: 100%;
  }

}