/* StudyGen minimal landing — pure HTML/CSS (no frameworks) */
:root{
  --bg:#0b0d10;
  --card:#11151b;
  --card2:#0e1217;
  --text:#e8ecf2;
  --muted:#a6b0c0;
  --line:rgba(255,255,255,.10);
  --shadow: 0 20px 60px rgba(0,0,0,.45);
  --radius: 22px;
  --radius2: 16px;
  --accent: #ffffff;
  --accent2: rgba(255,255,255,.12);
  --max: 1120px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  overflow-x:hidden;
}

a{color:inherit; text-decoration:none}
.container{width:min(var(--max), calc(100% - 40px)); margin:0 auto}

.bg{position:fixed; inset:0; z-index:-2}
.radial{
  position:absolute; inset:-20%;
  background:
    radial-gradient(800px 500px at 15% 10%, rgba(255,255,255,.10), transparent 60%),
    radial-gradient(700px 500px at 85% 20%, rgba(255,255,255,.08), transparent 60%),
    radial-gradient(700px 600px at 55% 90%, rgba(255,255,255,.06), transparent 60%);
  filter: blur(0px);
}
.grain{
  position:absolute; inset:0;
  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='.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.07'/%3E%3C/svg%3E");
  opacity:.35;
  mix-blend-mode: overlay;
}

.header{
  position:sticky; top:0;
  backdrop-filter: blur(14px);
  background: rgba(11,13,16,.55);
  border-bottom: 1px solid var(--line);
  z-index:10;
}
.header__inner{
  display:flex; align-items:center; justify-content:space-between;
  padding: 14px 0;
  gap: 18px;
}

.brand{display:flex; align-items:center; gap:10px; font-weight:700; letter-spacing:.2px; text-decoration:none; color:inherit; transition:opacity .2s ease}
.brand:hover{opacity:.8}
.brand__mark{
  width:28px; height:28px; border-radius:10px;
  background:
    linear-gradient(180deg, rgba(255,255,255,.90), rgba(255,255,255,.18));
  box-shadow: 0 8px 30px rgba(255,255,255,.10);
}
.brand__logo{
  width:28px; height:28px; border-radius:10px;
  display:block;
}
.brand--small .brand__mark{width:22px;height:22px;border-radius:8px}
.brand--small .brand__logo{width:22px;height:22px;border-radius:8px}
.brand__text{font-size:15px}

.nav{display:flex; gap:18px; align-items:center}
.nav__link{
  font-size: 14px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 12px;
}
.nav__link:hover{color:var(--text); background: rgba(255,255,255,.06)}

.header__cta{display:flex; gap:10px; align-items:center}
.burger{
  display:none;
  width:42px; height:42px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.04);
  border-radius: 14px;
  padding:10px;
  cursor:pointer;
}
.burger span{display:block; height:2px; background: rgba(255,255,255,.82); margin:6px 0; border-radius:3px}

.mobile{
  border-top: 1px solid var(--line);
  background: rgba(11,13,16,.88);
}
.mobile__inner{padding: 14px 0 18px; display:grid; gap:10px}
.mobile__link{
  padding: 12px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255,255,255,.03);
  color: var(--muted);
}
.mobile__link:hover{color:var(--text)}
.mobile__buttons{display:flex; gap:10px; margin-top:6px}

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  height: 44px;
  padding: 0 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  font-weight: 600;
  font-size: 14px;
  cursor:pointer;
  user-select:none;
  transition: transform .08s ease, background .15s ease, border-color .15s ease, opacity .15s ease;
}
.btn:active{transform: translateY(1px)}
.btn--primary{
  background: rgba(255,255,255,.92);
  color: #0b0d10;
  border-color: rgba(255,255,255,.30);
}
.btn--primary:hover{opacity:.95}
.btn--ghost{
  background: rgba(255,255,255,.03);
  color: var(--text);
}
.btn--ghost:hover{background: rgba(255,255,255,.06)}
.w100{width:100%}

.hero{padding: 56px 0 26px}
.hero__inner{
  display:grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 28px;
  align-items:center;
}
.badge{
  display:inline-flex;
  align-items:center;
  padding: 8px 12px;
  border:1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.03);
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 14px;
}
h1{
  margin:0 0 12px;
  font-size: clamp(34px, 4.2vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.muted{color: var(--muted)}
.lead{
  margin:0 0 20px;
  font-size: 16px;
  color: rgba(232,236,242,.86);
  max-width: 52ch;
}
.hero__buttons{display:flex; gap:10px; flex-wrap:wrap}
.hero__meta{display:flex; gap:12px; margin-top:18px; flex-wrap:wrap}
.meta{
  padding: 10px 12px;
  border:1px solid var(--line);
  border-radius: 16px;
  background: rgba(255,255,255,.02);
  min-width: 150px;
}
.meta__kpi{font-weight:700}
.meta__label{color: var(--muted); font-size: 13px; margin-top:2px}

.hero__card{position:relative}
.card{
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,.12);
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  box-shadow: var(--shadow);
  overflow:hidden;
}
.card__top{
  display:flex; align-items:center; gap:12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.03);
}
.dots{display:flex; gap:6px}
.dots span{width:10px;height:10px;border-radius:50%; background: rgba(255,255,255,.18)}
.card__title{font-weight:600; color: rgba(255,255,255,.86); font-size: 13px}
.card__body{padding: 16px}
.field{margin-bottom: 14px}
.field__label{font-size: 12px; color: var(--muted); margin-bottom:8px}
.chips{display:flex; gap:8px; flex-wrap:wrap}
.chip{
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.02);
  color: rgba(232,236,242,.86);
  font-size: 13px;
}
.chip--active{background: rgba(255,255,255,.10)}
.input{
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,.18);
  color: rgba(232,236,242,.72);
  font-size: 13px;
}
.outline{
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,.16);
  overflow:hidden;
}
.outline__item{
  padding: 10px 12px;
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: 13px;
  color: rgba(232,236,242,.86);
}
.outline__item:first-child{border-top:none}
.pill{
  display:inline-flex; align-items:center;
  padding: 4px 8px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.06);
  font-size: 12px;
}
.card__actions{
  display:flex; align-items:center; justify-content:space-between;
  padding-top: 8px;
}
.hint{color: var(--muted); font-size: 13px}
.btn-mini{
  width:36px; height:36px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.08);
  display:grid; place-items:center;
}

.float{
  position:absolute;
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(11,13,16,.72);
  backdrop-filter: blur(10px);
  color: rgba(232,236,242,.9);
  font-size: 13px;
  box-shadow: 0 14px 40px rgba(0,0,0,.35);
  white-space: nowrap;
}
.float--a{top:-12px; left:-8px}
.float--b{bottom: 28px; left:-10px}
.float--c{bottom:-14px; right:-10px}

.section{padding: 54px 0}
.section--alt{
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.02);
}
.section__head{max-width: 720px; margin-bottom: 22px}
h2{
  margin: 0 0 8px;
  font-size: clamp(22px, 2.6vw, 32px);
  letter-spacing: -0.01em;
}
.sub{margin:0; color: var(--muted)}

.grid3{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.feature{
  padding: 18px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.02);
}
.feature__icon{font-size: 18px; opacity:.9}
.feature h3{margin: 10px 0 6px; font-size: 16px}
.feature p{margin:0; color: rgba(232,236,242,.78); font-size: 14px}

.steps{display:grid; gap: 12px; margin-top: 6px}
.step{
  display:flex; gap: 14px;
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.02);
}
.step__n{
  width:52px; height:52px;
  border-radius: 18px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
  display:grid; place-items:center;
  font-weight: 700;
}
.step__t h3{margin:0 0 4px; font-size: 16px}
.step__t p{margin:0; color: rgba(232,236,242,.78); font-size: 14px}

.callout{
  margin-top: 18px;
  padding: 18px 16px;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,.14);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  display:flex; align-items:center; justify-content:space-between;
  gap: 12px;
}
.callout__title{font-weight:700}
.callout__sub{color: var(--muted); margin-top: 2px; font-size: 14px}

.pricing{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items:stretch;
}
.price{
  position:relative;
  padding: 28px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.02);
  display: flex;
  flex-direction: column;
}
.price__top{display:flex; flex-direction:column; gap: 8px; margin-bottom: 16px}
.price__top h3{margin:0; font-size: 18px; font-weight: 700}
.price__tag{color: var(--muted); font-size: 13px}
.price__value{margin: 8px 0 20px; display:flex; align-items:baseline; gap:8px}
.price__num{font-size: 36px; font-weight: 800; letter-spacing:-0.02em}
.price__per{color: var(--muted); font-size: 14px}
.list{margin: 0 0 20px; padding-left: 20px; color: rgba(232,236,242,.78); font-size: 14px; flex-grow: 1}
.list li{margin: 8px 0}
.fine{margin-top: 12px; color: var(--muted); font-size: 12px; text-align: center}
.price--featured{
  border-color: rgba(255,255,255,.22);
  background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.02));
}
.price__badge{
  position:absolute; top: 14px; right: 14px;
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.90);
  color: #0b0d10;
  font-weight: 700;
}
.note{
  margin-top: 18px;
  display:flex; align-items:center; gap:10px;
  color: var(--muted);
  font-size: 14px;
}
.note__dot{width:10px;height:10px;border-radius:50%; background: rgba(255,255,255,.26)}

.faq{display:grid; gap: 10px}
.faq__item{
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.02);
  padding: 14px 14px;
}
.faq summary{
  cursor:pointer;
  font-weight: 600;
  list-style:none;
}
.faq summary::-webkit-details-marker{display:none}
.faq__a{color: rgba(232,236,242,.78); margin-top: 10px; font-size: 14px}

.cta{
  margin-top: 18px;
  padding: 18px 16px;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.03);
  display:flex; align-items:center; justify-content:space-between; gap: 12px;
}
.cta__copy h3{margin:0 0 6px; font-size: 18px}
.cta__copy p{margin:0; color: var(--muted)}

.footer{
  padding: 26px 0 34px;
  border-top: 1px solid var(--line);
  background: rgba(0,0,0,.18);
}
.footer__inner{display:flex; align-items:flex-start; justify-content:space-between; gap: 16px}
.footer__meta{color: var(--muted); font-size: 13px; margin-top: 8px}
.footer__right{display:flex; gap:14px; align-items:center; flex-wrap:wrap}
.footer__link{color: var(--muted); font-size: 14px}
.footer__link:hover{color: var(--text)}

@media (max-width: 920px){
  .hero__inner{grid-template-columns: 1fr; gap: 18px}
  .float{display:none}
  .grid3{grid-template-columns: 1fr}
  .pricing{grid-template-columns: 1fr}
  .callout, .cta{flex-direction:column; align-items:flex-start}
  .nav{display:none}
  .burger{display:block}
  .header__cta{display:none}
  .mobile__buttons{flex-direction:column}
}


/* --- Hero animation (replaces UI mock) --- */
.hero__visual{position:relative}
.visual{
  position:relative;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,.12);
  background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02));
  box-shadow: var(--shadow);
  overflow:hidden;
  min-height: 420px;
}
.visual__halo{
  position:absolute; inset:-40%;
  background:
    radial-gradient(420px 320px at 30% 25%, rgba(255,255,255,.14), transparent 60%),
    radial-gradient(420px 320px at 70% 70%, rgba(255,255,255,.10), transparent 60%);
  filter: blur(2px);
  animation: halo 8s ease-in-out infinite;
}
@keyframes halo{
  0%,100%{transform: translate3d(0,0,0) scale(1)}
  50%{transform: translate3d(2%, -1%, 0) scale(1.03)}
}
.visual__grid{
  position:absolute; inset:0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(60% 60% at 50% 45%, rgba(0,0,0,.9), transparent 70%);
  opacity:.35;
}

.doc{
  position:absolute;
  left: 50%;
  top: 52%;
  transform: translate(-50%, -50%);
  width: min(520px, calc(100% - 48px));
  border-radius: 22px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(11,13,16,.68);
  backdrop-filter: blur(14px);
  box-shadow: 0 24px 70px rgba(0,0,0,.55);
  overflow:hidden;
}
.doc__top{
  display:flex; align-items:center; justify-content:space-between;
  gap:12px;
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255,255,255,.10);
  background: rgba(255,255,255,.03);
}
.doc__dots{display:flex; gap:6px}
.doc__dots span{width:10px;height:10px;border-radius:50%; background: rgba(255,255,255,.18)}
.doc__title{font-weight:600; font-size: 13px; color: rgba(255,255,255,.86)}
.doc__status{display:flex; align-items:center; gap:8px; color: var(--muted); font-size: 13px}
.pulse{
  width:8px; height:8px; border-radius:50%;
  background: rgba(255,255,255,.85);
  box-shadow: 0 0 0 0 rgba(255,255,255,.35);
  animation: pulse 1.5s ease infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(255,255,255,.35)}
  70%{box-shadow:0 0 0 10px rgba(255,255,255,0)}
  100%{box-shadow:0 0 0 0 rgba(255,255,255,0)}
}
.doc__body{padding: 16px; position:relative}
.lines{display:grid; gap:10px; padding: 4px 0 12px}
.lines span{
  height: 12px;
  border-radius: 999px;
  width: var(--w);
  background: linear-gradient(90deg, rgba(255,255,255,.10), rgba(255,255,255,.22), rgba(255,255,255,.10));
  background-size: 220% 100%;
  animation: shimmer 2.2s ease-in-out infinite;
}
.lines span:nth-child(2){animation-delay:.10s}
.lines span:nth-child(3){animation-delay:.20s}
.lines span:nth-child(4){animation-delay:.30s}
.lines span:nth-child(5){animation-delay:.40s}
.lines span:nth-child(6){animation-delay:.50s}
.lines span:nth-child(7){animation-delay:.60s}
@keyframes shimmer{
  0%{background-position: 0% 0%}
  50%{background-position: 100% 0%}
  100%{background-position: 0% 0%}
}

.progress{
  height: 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(0,0,0,.22);
  overflow:hidden;
  margin: 6px 0 14px;
}
.progress__bar{
  height: 100%;
  width: 45%;
  border-radius: 999px;
  background: rgba(255,255,255,.75);
  animation: load 2.8s ease-in-out infinite;
}
@keyframes load{
  0%{transform: translateX(-10%); width: 22%}
  50%{transform: translateX(10%); width: 78%}
  100%{transform: translateX(-10%); width: 22%}
}

.chips2{display:flex; gap:8px; flex-wrap:wrap}
.chip2{
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.05);
  font-size: 13px;
  color: rgba(232,236,242,.88);
}

.cursor{
  position:absolute;
  left: 16px;
  top: 32px;
  width: 2px;
  height: 18px;
  border-radius: 2px;
  background: rgba(255,255,255,.85);
  animation: cursor 3.2s ease-in-out infinite;
}
@keyframes cursor{
  0%{transform: translate3d(0, 6px, 0); opacity:0}
  10%{opacity:1}
  35%{transform: translate3d(240px, 6px, 0); opacity:1}
  50%{transform: translate3d(80px, 54px, 0); opacity:1}
  65%{transform: translate3d(300px, 54px, 0); opacity:1}
  80%{transform: translate3d(140px, 102px, 0); opacity:1}
  100%{transform: translate3d(0, 102px, 0); opacity:0}
}

/* floating labels */
.floaty{
  position:absolute;
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(11,13,16,.72);
  backdrop-filter: blur(10px);
  color: rgba(232,236,242,.9);
  font-size: 13px;
  box-shadow: 0 14px 40px rgba(0,0,0,.35);
  white-space: nowrap;
  animation: floaty 6s ease-in-out infinite;
}
@keyframes floaty{
  0%,100%{transform: translate3d(0,0,0)}
  50%{transform: translate3d(0,-8px,0)}
}
.floaty--a{top: 14px; left: 14px; animation-delay:.0s}
.floaty--b{bottom: 18px; left: 14px; animation-delay:.3s}
.floaty--c{bottom: 14px; right: 14px; animation-delay:.6s}

@media (max-width: 920px){
  .visual{min-height: 360px}
  .floaty{display:none}
}