/* ============================================================
   HOMESCHOOL AI — brand stylesheet
   Brand: Indigo #4F46E5 · Violet #7C3AED · Amber #F59E0B
   Cream background #FFFBF5 · Ink #26233D
   Fonts: Fraunces (headings) + Inter (body)
   To rebrand: change the variables in :root below.
   ============================================================ */
:root{
  --indigo:#4F46E5;
  --indigo-dark:#3730A3;
  --violet:#7C3AED;
  --amber:#F59E0B;
  --amber-dark:#D97706;
  --ink:#26233D;
  --muted:#66617E;
  --cream:#FFFBF5;
  --paper:#FFFFFF;
  --lav:#EEF0FE;
  --lav-2:#E3E7FD;
  --line:#E9E6F7;
  --radius:18px;
  --shadow:0 18px 40px -18px rgba(55,48,163,.28);
  --shadow-sm:0 8px 24px -12px rgba(55,48,163,.25);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--cream);
  color:var(--ink);
  line-height:1.65;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--indigo);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,.display{font-family:'Fraunces',Georgia,serif;font-weight:600;line-height:1.15;letter-spacing:-.01em}
.wrap{max-width:1140px;margin:0 auto;padding:0 22px}
.eyebrow{
  display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--indigo-dark);background:var(--lav);
  padding:.35rem .8rem;border-radius:999px;margin-bottom:1rem;
}
.btn{
  display:inline-block;background:var(--indigo);color:#fff;font-weight:600;
  padding:.85rem 1.6rem;border-radius:999px;border:0;cursor:pointer;font-size:1rem;
  transition:transform .15s ease,background .15s ease;box-shadow:var(--shadow-sm);
}
.btn:hover{background:var(--indigo-dark);text-decoration:none;transform:translateY(-1px)}
.btn-amber{background:var(--amber);color:#3A2A00}
.btn-amber:hover{background:var(--amber-dark);color:#fff}
.btn-ghost{background:transparent;color:var(--indigo);box-shadow:none;border:2px solid var(--lav-2)}
.btn-ghost:hover{border-color:var(--indigo);background:#fff}

/* ---------- Header ---------- */
header.site{
  position:sticky;top:0;z-index:50;background:rgba(255,251,245,.92);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:1.6rem;padding:.8rem 0}
.brand{display:flex;align-items:center;gap:.6rem;font-family:'Fraunces',serif;font-size:1.35rem;font-weight:700;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand img{width:40px;height:40px}
.brand .ai{color:var(--indigo)}
.brand .dot{color:var(--amber)}
nav.main{margin-left:auto;display:flex;gap:1.5rem;align-items:center}
nav.main a{color:var(--ink);font-weight:500;font-size:.98rem}
nav.main a:hover{color:var(--indigo);text-decoration:none}
nav.main a.btn{color:#fff;padding:.55rem 1.15rem}
.nav-toggle{display:none;margin-left:auto;background:none;border:0;font-size:1.6rem;cursor:pointer;color:var(--ink)}
@media(max-width:820px){
  nav.main{display:none;position:absolute;top:100%;left:0;right:0;background:var(--cream);
    flex-direction:column;align-items:flex-start;padding:1rem 22px 1.3rem;border-bottom:1px solid var(--line);gap:1rem}
  nav.main.open{display:flex}
  .nav-toggle{display:block}
}

/* ---------- Hero ---------- */
.hero{padding:4.2rem 0 3.4rem;background:
  radial-gradient(900px 480px at 85% -10%,var(--lav) 0%,transparent 60%),
  radial-gradient(700px 420px at -10% 110%,#FDEFD2 0%,transparent 55%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:3rem;align-items:center}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr}}
.hero h1{font-size:clamp(2.4rem,5.2vw,3.6rem);margin-bottom:1.1rem}
.hero h1 em{font-style:normal;color:var(--indigo);position:relative;white-space:nowrap}
.hero h1 em::after{content:"";position:absolute;left:0;right:0;bottom:.06em;height:.32em;background:#FCE3AE;border-radius:4px;z-index:-1}
.hero p.lede{font-size:1.18rem;color:var(--muted);max-width:34rem;margin-bottom:1.6rem}
.hero-art{position:relative}
.hero-art img{border-radius:26px;box-shadow:var(--shadow)}
.chip{
  position:absolute;background:#fff;border-radius:999px;padding:.45rem .95rem;
  font-size:.85rem;font-weight:600;box-shadow:var(--shadow-sm);display:flex;gap:.4rem;align-items:center;
}
.chip.one{top:18px;left:-14px}
.chip.two{bottom:22px;right:-10px}
@media(max-width:900px){.chip.one{left:8px}.chip.two{right:8px}}

/* ---------- Signup forms ---------- */
.signup-form{display:flex;gap:.6rem;max-width:30rem;flex-wrap:wrap}
.signup-form input[type=email]{
  flex:1;min-width:220px;padding:.85rem 1.1rem;border:2px solid var(--lav-2);
  border-radius:999px;font-size:1rem;background:#fff;color:var(--ink);
}
.signup-form input[type=email]:focus{outline:none;border-color:var(--indigo)}
.form-note{font-size:.85rem;color:var(--muted);margin-top:.6rem}
.form-msg{font-size:.95rem;font-weight:600;margin-top:.7rem;display:none}
.form-msg.ok{display:block;color:#15803D}
.form-msg.warn{display:block;color:var(--amber-dark)}

/* ---------- Trust strip ---------- */
.trust{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.trust .wrap{display:flex;gap:2rem;flex-wrap:wrap;justify-content:space-between;padding-top:1.1rem;padding-bottom:1.1rem}
.trust div{font-size:.95rem;font-weight:600;color:var(--indigo-dark)}
.trust span{display:block;font-weight:400;color:var(--muted);font-size:.88rem}

/* ---------- Sections & cards ---------- */
section.block{padding:4rem 0}
section.block h2{font-size:clamp(1.8rem,3.4vw,2.5rem);margin-bottom:.7rem}
section.block .sub{color:var(--muted);max-width:42rem;margin-bottom:2.2rem;font-size:1.06rem}
.grid{display:grid;gap:1.4rem}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.grid.c3{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.grid.c3,.grid.c2{grid-template-columns:1fr}}
.card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.6rem;box-shadow:0 4px 14px -10px rgba(55,48,163,.18);
  transition:transform .15s ease,box-shadow .15s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm)}
.card .icon{font-size:1.7rem;margin-bottom:.7rem}
.card h3{font-size:1.22rem;margin-bottom:.45rem}
.card p{color:var(--muted);font-size:.97rem}
.card .more{font-weight:600;font-size:.95rem;margin-top:.8rem;display:inline-block}
.post-card{padding:0;overflow:hidden}
.post-card img{height:190px;width:100%;object-fit:cover}
.post-card .body{padding:1.4rem 1.6rem 1.6rem}
.tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--indigo-dark);background:var(--lav);padding:.25rem .65rem;border-radius:999px;margin-bottom:.6rem}
.post-card .date{font-size:.85rem;color:var(--muted)}

/* ---------- Steps ---------- */
.steps{display:grid;grid-template-columns:.95fr 1.05fr;gap:3rem;align-items:center}
@media(max-width:900px){.steps{grid-template-columns:1fr}}
.steps img{border-radius:26px;box-shadow:var(--shadow)}
.step{display:flex;gap:1.1rem;margin-bottom:1.5rem}
.step .num{
  flex:0 0 44px;height:44px;border-radius:50%;background:var(--indigo);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-family:'Fraunces',serif;font-size:1.15rem;
}
.step h3{font-size:1.15rem;margin-bottom:.25rem}
.step p{color:var(--muted);font-size:.97rem}

/* ---------- Video band ---------- */
.band{background:linear-gradient(135deg,var(--indigo-dark),var(--violet));color:#fff;border-radius:30px;padding:2.8rem}
@media(max-width:620px){.band{padding:2rem 1.4rem}}
.band h2{color:#fff}
.band p{color:#D9DBFF;max-width:36rem}
.video-frame{position:relative;border-radius:16px;overflow:hidden;background:#17122E;aspect-ratio:16/9}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-frame img{width:100%;height:100%;object-fit:cover;opacity:.9}
.video-frame .soon{
  position:absolute;inset:auto 14px 14px auto;background:var(--amber);color:#3A2A00;
  font-weight:700;font-size:.8rem;padding:.35rem .8rem;border-radius:999px;
}

/* ---------- FAQ ---------- */
details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:1.1rem 1.4rem;margin-bottom:.8rem}
details summary{font-weight:600;cursor:pointer;font-size:1.03rem}
details p{color:var(--muted);margin-top:.6rem;font-size:.97rem}

/* ---------- CTA band ---------- */
.cta{background:var(--lav);border-radius:30px;padding:3rem;text-align:center}
@media(max-width:620px){.cta{padding:2.2rem 1.4rem}}
.cta h2{margin-bottom:.6rem}
.cta p{color:var(--muted);max-width:34rem;margin:0 auto 1.6rem}
.cta .signup-form{margin:0 auto;justify-content:center}
.cta .form-note{text-align:center}

/* ---------- Article ---------- */
article.post{max-width:760px;margin:0 auto;padding:3rem 22px 1rem}
article.post h1{font-size:clamp(2rem,4.4vw,2.9rem);margin-bottom:.8rem}
article.post .byline{color:var(--muted);font-size:.95rem;margin-bottom:1.8rem}
article.post .hero-img{border-radius:22px;margin-bottom:2rem;box-shadow:var(--shadow-sm)}
article.post h2{font-size:1.6rem;margin:2.2rem 0 .7rem}
article.post h3{font-size:1.25rem;margin:1.6rem 0 .5rem}
article.post p{margin-bottom:1.05rem}
article.post ul,article.post ol{margin:0 0 1.1rem 1.3rem}
article.post li{margin-bottom:.45rem}
.prompt-box{
  background:#fff;border:1px dashed var(--indigo);border-left:5px solid var(--amber);
  border-radius:12px;padding:1rem 1.2rem;margin:0 0 1.2rem;font-size:.97rem;
}
.prompt-box .label{font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--amber-dark);display:block;margin-bottom:.35rem}
.tip{background:var(--lav);border-radius:12px;padding:1rem 1.2rem;margin:0 0 1.2rem;font-size:.97rem}
.post-signup{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.8rem;margin:2.4rem 0;box-shadow:var(--shadow-sm)}
.post-signup h3{margin-bottom:.4rem}
.post-signup p{color:var(--muted);font-size:.97rem}

/* ---------- Teacher-Checked system ---------- */
.stamp{
  display:inline-flex;align-items:center;gap:.45rem;background:#15803D;color:#fff;
  font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  padding:.4rem .85rem;border-radius:999px;box-shadow:var(--shadow-sm);
}
.stamp::before{content:"✓";background:#fff;color:#15803D;width:18px;height:18px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;font-size:.72rem}
.check-note{
  margin-top:.6rem;padding-top:.6rem;border-top:1px dotted var(--lav-2);
  font-size:.9rem;color:var(--muted);line-height:1.55;
}
.check-note strong{color:var(--indigo-dark)}
.prompt-box .stamp{margin-bottom:.55rem;text-transform:none;letter-spacing:.02em;font-size:.75rem;padding:.3rem .7rem}
.ethics{background:#FFF7E8;border:1px solid #F5D9A8;border-radius:12px;padding:1rem 1.2rem;margin:0 0 1.2rem;font-size:.97rem}
.ethics strong{color:var(--amber-dark)}

/* ---------- Bad AI vs Teacher-Fixed ---------- */
.vs-box{border-radius:12px;padding:1.1rem 1.25rem;margin:0 0 1.2rem;font-size:.97rem}
.vs-box .label{font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;display:block;margin-bottom:.4rem}
.vs-bad{background:#FDF0EF;border:1px solid #F3C1BC;border-left:5px solid #D64541}
.vs-bad .label{color:#B3261E}
.vs-fixed{background:#EEF9F0;border:1px solid #BFE6C8;border-left:5px solid #15803D}
.vs-fixed .label{color:#15803D}
.vs-box ul{margin:.4rem 0 0 1.2rem}
.vs-box li{margin-bottom:.35rem}

/* ---------- Video library ---------- */
.path-head{display:flex;align-items:baseline;gap:1rem;flex-wrap:wrap;margin:2.6rem 0 .4rem}
.path-head h2{margin-bottom:0}
.path-sub{color:var(--muted);max-width:44rem;margin-bottom:1.6rem}
.vid{margin-bottom:.4rem}
.vid h3{margin-top:1rem;font-size:1.18rem}
.vid .meta{font-size:.85rem;color:var(--muted);font-weight:600;letter-spacing:.02em}
.vid p{color:var(--muted);font-size:.96rem}
.vid .try{background:var(--lav);border-radius:10px;padding:.7rem .95rem;font-size:.92rem;color:var(--ink);margin-top:.6rem}
.vid .try strong{color:var(--indigo-dark)}

/* ---------- Footer ---------- */
footer.site{border-top:1px solid var(--line);margin-top:4rem;padding:2.6rem 0 2rem;background:#fff}
.foot-grid{display:flex;gap:2.5rem;flex-wrap:wrap;justify-content:space-between}
.foot-grid nav{display:flex;flex-direction:column;gap:.5rem}
.foot-grid nav a{color:var(--muted);font-size:.95rem}
.foot-grid h4{font-size:.85rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:.8rem;color:var(--ink)}
.foot-base{margin-top:2.2rem;padding-top:1.2rem;border-top:1px solid var(--line);font-size:.87rem;color:var(--muted);display:flex;gap:1rem;flex-wrap:wrap;justify-content:space-between}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(16px);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}}