@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root{
  --primary:#2563eb;
  --primary-dark:#1d4ed8;
  --ink:#0f172a;
  --muted:#64748b;
  --bg:#f8fafc;
  --card:#ffffff;
  --line:#e2e8f0;
  --dark:#0b1220;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:Inter,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6}
a{text-decoration:none;color:inherit}
.container{width:min(1120px,92%);margin:auto}
.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{height:72px;display:flex;align-items:center;justify-content:space-between}
.logo{font-weight:800;font-size:1.05rem;display:flex;align-items:center;gap:9px}
.logo span{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--primary);color:#fff}
nav{display:flex;align-items:center;gap:25px;font-size:.9rem;font-weight:600}
nav a:hover{color:var(--primary)}
.nav-cta{background:var(--ink);color:#fff;padding:10px 16px;border-radius:9px}
.menu{display:none;background:none;border:0;font-size:1.6rem}
.hero{background:linear-gradient(135deg,#eff6ff 0%,#fff 60%,#f1f5f9 100%);padding:90px 0 75px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:65px;align-items:center}
.eyebrow{color:var(--primary);font-size:.76rem;font-weight:800;letter-spacing:.12em;margin-bottom:12px}
h1{font-size:clamp(2.5rem,5vw,4.6rem);line-height:1.02;letter-spacing:-.055em;margin-bottom:24px}
h1 strong{color:var(--primary)}
.lead{font-size:1.12rem;color:#475569;max-width:650px}
.actions{display:flex;gap:12px;margin:30px 0}
.btn{display:inline-flex;justify-content:center;align-items:center;border:0;border-radius:10px;padding:13px 20px;font-weight:700;cursor:pointer;font-size:.95rem}
.primary{background:var(--primary);color:#fff}
.primary:hover{background:var(--primary-dark)}
.secondary{background:#fff;border:1px solid var(--line)}
.mini-proof{display:flex;gap:30px;margin-top:34px}
.mini-proof div{display:flex;flex-direction:column}
.mini-proof b{font-size:1.05rem}.mini-proof span{font-size:.76rem;color:var(--muted)}
.hero-card{position:relative;min-height:390px;display:grid;place-items:center}
.screen{width:min(440px,100%);height:300px;background:#fff;border-radius:18px;box-shadow:0 25px 70px rgba(15,23,42,.16);border:1px solid #dbeafe;overflow:hidden;transform:rotate(2deg)}
.screen-top{height:38px;background:#f1f5f9;display:flex;align-items:center;gap:6px;padding:0 14px}
.screen-top i{width:9px;height:9px;border-radius:50%;background:#cbd5e1}
.screen-body{padding:35px}
.code-line{height:12px;background:#dbeafe;border-radius:20px;width:68%;margin-bottom:14px}
.code-line.wide{width:88%}.code-line.medium{width:52%}
.apps{display:flex;gap:16px;margin-top:40px}
.app{width:68px;height:68px;border-radius:15px;display:grid;place-items:center;font-size:2rem;font-weight:800}
.word{background:#e8f0ff;color:#2563eb}.excel{background:#eaf8ef;color:#16a34a}.ppt{background:#fff1e9;color:#ea580c}.web{background:#f1f5f9}
.floating-card{position:absolute;bottom:15px;right:0;background:#fff;padding:16px 19px;border-radius:13px;box-shadow:0 14px 35px rgba(15,23,42,.14);font-size:.9rem}
.floating-card small{color:var(--muted)}
.section{padding:85px 0}
.section-heading{max-width:720px;margin-bottom:40px}
.section-heading h2,.benefits h2,.about-box h2,.signup-box h2{font-size:clamp(2rem,4vw,3rem);line-height:1.1;letter-spacing:-.04em;margin-bottom:15px}
.section-heading>p:last-child{color:var(--muted)}
.cards{display:grid;gap:20px}.three{grid-template-columns:repeat(3,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:30px}
.icon{font-size:1.8rem;margin-bottom:18px}.card h3{margin-bottom:8px}.card p{color:var(--muted);font-size:.94rem}
.dark{background:var(--dark);color:#fff}.light h2{color:#fff}.light>p:last-child{color:#94a3b8}
.content-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.topic{display:flex;gap:18px;padding:22px;border:1px solid #263248;border-radius:13px;background:#111a2c}
.topic>span{font-weight:800;color:#60a5fa}.topic h3{margin-bottom:4px}.topic p{color:#94a3b8;font-size:.9rem}
.benefits{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}
.lead-small{color:var(--muted);max-width:600px}
.checklist{display:grid;grid-template-columns:1fr 1fr;gap:14px;list-style:none;font-weight:600}.checklist li{background:#fff;padding:15px;border:1px solid var(--line);border-radius:10px}
.about{background:#eef2ff}
.about-box{display:flex;gap:35px;align-items:center;background:#fff;border-radius:20px;padding:45px;border:1px solid #dbeafe}
.teacher-avatar{width:100px;height:100px;flex:none;border-radius:50%;display:grid;place-items:center;background:#dbeafe;font-size:3rem}
.about-box p{color:var(--muted);margin-top:8px}
.signup{background:#fff}
.signup-box{background:linear-gradient(135deg,#172554,#1e40af);color:#fff;border-radius:20px;padding:45px;display:grid;grid-template-columns:1fr .85fr;gap:50px;align-items:center}
.signup-box .eyebrow{color:#93c5fd}.signup-box p{color:#dbeafe}
form{display:grid;gap:12px}
input{width:100%;padding:14px 15px;border-radius:9px;border:1px solid #bfdbfe;font:inherit}
form .primary{background:#fff;color:#1d4ed8}.formMessage{color:#bfdbfe}
footer{background:#080d18;color:#cbd5e1;padding:30px 0}.footer{display:flex;justify-content:space-between;gap:20px;font-size:.82rem}.footer b{color:#fff}.footer span{color:#64748b}
@media(max-width:800px){
  nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;padding:18px 5%;flex-direction:column;align-items:stretch;border-bottom:1px solid var(--line)}
  nav.open{display:flex}.menu{display:block}
  .hero{padding:60px 0}.hero-grid,.benefits,.signup-box{grid-template-columns:1fr}
  .hero-card{min-height:330px}.three{grid-template-columns:1fr}.content-grid{grid-template-columns:1fr}
  .benefits{gap:35px}.about-box{align-items:flex-start;flex-direction:column}.checklist{grid-template-columns:1fr}
  .signup-box{gap:25px}.footer{flex-direction:column}
}