:root{
  --navy:#021d4a;
  --blue:#3f41fd;
  --ink:#071a36;
  --muted:#66738a;
  --soft:#f5f7fb;
  --line:#e4e9f2;
  --white:#fff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,system-ui,sans-serif;color:var(--ink);background:#fff;line-height:1.6}
a{text-decoration:none;color:inherit}
.nav{height:76px;display:flex;align-items:center;justify-content:space-between;max-width:1160px;margin:auto;padding:0 24px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:-.02em}
.brand b{font-weight:800}
.brand-mark{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:var(--navy);color:#fff;font-weight:800}
.nav nav{display:flex;align-items:center;gap:28px;font-size:14px;font-weight:500}
.nav nav a{color:#526078}
.nav nav .nav-cta{color:#fff;background:var(--navy);padding:11px 17px;border-radius:10px}
.hero{max-width:1160px;margin:auto;padding:90px 24px 110px;display:grid;grid-template-columns:1.02fr .98fr;gap:70px;align-items:center}
.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.15em;font-weight:800;color:var(--blue)}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(45px,6vw,72px);line-height:1.02;letter-spacing:-.055em;margin:18px 0 24px;max-width:720px}
h1 span,h2 span{color:var(--blue)}
.lead{font-size:18px;line-height:1.7;color:var(--muted);max-width:630px}
.hero-actions{display:flex;align-items:center;gap:25px;margin-top:34px}
.button{display:inline-flex;gap:14px;align-items:center;border-radius:10px;padding:14px 20px;font-weight:700;font-size:14px}
.primary{background:var(--blue);color:#fff;box-shadow:0 12px 28px rgba(63,65,253,.2)}
.text-link{font-size:14px;font-weight:700}
.text-link:hover{text-decoration:underline}
.hero-visual{position:relative;min-height:420px;display:grid;place-items:center}
.glow{position:absolute;width:350px;height:350px;background:#e9ebff;border-radius:50%;filter:blur(8px)}
.chat-card{position:relative;width:min(430px,100%);background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:0 28px 70px rgba(2,29,74,.12)}
.chat-top{display:flex;align-items:center;gap:9px;font-size:12px;font-weight:700;color:#718096;border-bottom:1px solid var(--line);padding-bottom:16px}
.dot{width:8px;height:8px;border-radius:50%;background:#3f41fd}
.question{background:#f4f6fa;border-radius:12px;padding:15px;margin:20px 0;font-size:14px;font-weight:600}
.answer{display:flex;gap:12px;font-size:13px;line-height:1.55}
.ai-dot{width:28px;height:28px;flex:0 0 28px;display:grid;place-items:center;background:#eef0ff;border-radius:8px;color:var(--blue)}
.answer strong{font-size:13px}.answer p{margin:4px 0 0;color:var(--muted)}
.source{margin-top:18px;padding-top:14px;border-top:1px solid var(--line);font-size:11px;color:#4e5f76;font-weight:700}
.section{max-width:1160px;margin:auto;padding:105px 24px}
.section-heading h2,.how h2{font-size:clamp(34px,4vw,50px);line-height:1.1;letter-spacing:-.045em;margin:15px 0 48px}
.problem-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.problem-card{padding:34px;border:1px solid var(--line);border-radius:18px;background:#fff}
.problem-card .icon{font-size:12px;color:var(--blue);font-weight:800;margin-bottom:35px}
.problem-card h3{font-size:22px;letter-spacing:-.025em}.problem-card p{color:var(--muted);max-width:460px;margin:0}
.benefits{max-width:none;background:var(--soft)}
.benefits>.section-heading,.benefit-grid{max-width:1160px;margin-left:auto;margin-right:auto}
.center{text-align:center}.center h2{margin-bottom:55px}
.benefit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.benefit-card{border-radius:18px;padding:32px;min-height:365px}
.benefit-card.student{background:#fff;border:1px solid var(--line)}
.benefit-card.teacher{background:var(--navy);color:#fff}
.benefit-card.institution{background:var(--blue);color:#fff}
.tag{font-size:10px;letter-spacing:.14em;font-weight:800;opacity:.65}
.benefit-card h3{font-size:25px;line-height:1.2;letter-spacing:-.035em;margin:30px 0}
.benefit-card ul{list-style:none;padding:0;margin:0;display:grid;gap:16px;font-size:13px}
.benefit-card li{display:flex;gap:9px}.benefit-card li span{font-weight:800}
.how{max-width:1160px;margin:auto;padding:105px 24px;display:grid;grid-template-columns:1fr 1.2fr;gap:70px;align-items:center}
.how h2{margin-bottom:0}
.flow{display:flex;align-items:center;justify-content:center;gap:14px}
.flow>div:not(.arrow){background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:20px 17px;min-width:120px;display:flex;flex-direction:column;gap:7px}
.flow b{color:var(--blue);font-size:11px}.flow span{font-size:12px;font-weight:700}.arrow{color:#a5aec0}
.demo{max-width:1160px;margin:0 auto;padding:20px 24px 100px}
.demo-card{background:var(--navy);color:#fff;border-radius:24px;padding:55px;display:flex;align-items:center;justify-content:space-between;gap:40px}
.demo-card h2{font-size:clamp(30px,4vw,45px);line-height:1.1;letter-spacing:-.04em;max-width:670px;margin:15px 0}
.demo-card p{color:#c4cede;margin:0}.light{color:#8e92ff}
.light-button{background:#fff;color:var(--navy);white-space:nowrap}
footer{max-width:1160px;margin:auto;padding:28px 24px 40px;display:flex;justify-content:space-between;align-items:center;color:#8792a4;font-size:12px;border-top:1px solid var(--line)}
@media(max-width:800px){
  .nav nav a:not(.nav-cta){display:none}
  .hero{grid-template-columns:1fr;padding-top:65px}.hero-visual{min-height:330px}
  .problem-grid,.benefit-grid,.how{grid-template-columns:1fr}
  .section,.how{padding-top:75px;padding-bottom:75px}
  .flow{flex-wrap:wrap}.arrow{display:none}
  .demo-card{padding:35px;display:block}.light-button{margin-top:28px}
  footer{display:block}.footer .brand{margin-bottom:12px}
}