:root{
  --blue:#0784c8;--deep:#063b68;--cyan:#14bde8;--bg:#f5f9fc;
  --text:#263746;--muted:#657889;--line:#dce8f0;--white:#fff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Arial,Helvetica,sans-serif;color:var(--text);background:var(--bg);line-height:1.7}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1200px;margin:auto;padding:0 20px}

header{background:#fff;border-bottom:1px solid var(--line)}
.header-top{max-width:1200px;margin:auto;padding:10px 20px;display:flex;align-items:center;justify-content:space-between;gap:25px}
.logo{width:285px;height:auto;display:block}
.search{display:flex;width:min(400px,100%);border:1px solid #cbd9e4;border-radius:6px;overflow:hidden}
.search input{flex:1;border:0;outline:0;padding:11px 13px;font-size:14px}
.search button{border:0;background:var(--blue);color:#fff;padding:0 18px;font-size:18px;cursor:pointer}

.navbar{background:var(--deep)}
.nav{max-width:1200px;margin:auto;display:flex;flex-wrap:wrap}
.nav-item{position:relative}
.nav-item>a{display:block;color:#fff;padding:13px 18px;font-weight:700;font-size:14px}
.nav-item>a:hover{background:#075084;text-decoration:none}
.dropdown{display:none;position:absolute;z-index:30;top:100%;left:0;min-width:220px;background:#fff;border:1px solid var(--line);box-shadow:0 8px 20px rgba(0,0,0,.14)}
.dropdown a{display:block;padding:9px 14px;color:var(--text);font-size:14px}
.dropdown a:hover{background:#eef8ff;text-decoration:none}
.nav-item:hover .dropdown{display:block}

.mobile-nav{display:none;max-width:1200px;margin:auto;padding:8px 20px;color:#fff;justify-content:space-between;align-items:center}
.mobile-nav select{padding:8px;border:0;border-radius:4px;min-width:220px}

.hero{background:linear-gradient(135deg,#eef9ff 0%,#fff 60%);border-bottom:1px solid var(--line)}
.hero-grid{max-width:1200px;margin:auto;padding:65px 20px 60px;display:grid;grid-template-columns:1.25fr .75fr;gap:45px;align-items:center}
.badge{display:inline-block;background:#dff5ff;color:#056b9f;font-weight:800;padding:6px 12px;border-radius:30px;font-size:12px;text-transform:uppercase}
h1{font-size:clamp(34px,5vw,54px);line-height:1.1;color:var(--deep);margin:15px 0}
.hero p{font-size:18px;color:#536979;max-width:700px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:25px}
.btn{display:inline-block;background:var(--blue);color:#fff;padding:12px 20px;border-radius:6px;font-weight:800}
.btn:hover{background:#066da5;color:#fff;text-decoration:none}
.btn.secondary{background:#fff;color:var(--deep);border:1px solid #b9d5e6}
.hero-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:26px;box-shadow:0 10px 30px rgba(3,65,100,.08)}
.hero-card h3{color:var(--deep);margin-top:0}
.stat{display:flex;gap:15px;align-items:center;padding:12px 0;border-bottom:1px solid var(--line)}
.stat:last-child{border-bottom:0}
.icon{width:38px;height:38px;display:grid;place-items:center;border-radius:50%;background:#e7f7ff;color:var(--blue);font-weight:900}

.section{padding:55px 0}
.section.alt{background:#fff}
.section-title{text-align:center;max-width:720px;margin:0 auto 30px}
.section-title h2{font-size:32px;color:var(--deep);margin:0 0 8px}
.section-title p{color:var(--muted);margin:0}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:9px;padding:23px;box-shadow:0 3px 12px rgba(4,55,90,.04)}
.card h3{color:var(--deep);margin:10px 0 6px}
.card p{color:#607384;margin-top:0}
.card-icon{font-size:28px;color:var(--blue)}
.card .link{font-weight:800}

.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.lesson{background:#fff;border:1px solid var(--line);border-radius:9px;overflow:hidden}
.lesson-top{background:#eaf7ff;padding:18px}
.lesson-body{padding:18px}
.lesson h3{color:var(--deep);margin:0 0 7px}
.lesson small{color:var(--muted)}

.video-section{background:var(--deep);color:#fff}
.video-grid{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center}
.video-section h2{font-size:32px;margin-top:0}
.video-section p{color:#d8e8f3}
.video-box{background:#0b4d79;border:1px solid #246991;border-radius:10px;min-height:230px;display:grid;place-items:center;text-align:center;padding:25px}
.play{width:70px;height:70px;border-radius:50%;background:var(--cyan);color:#fff;display:grid;place-items:center;font-size:28px;margin:auto}

.practice{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.practice-card{background:#fff;border:1px solid var(--line);border-radius:9px;padding:25px}
.practice-card h3{color:var(--deep);margin-top:0}

.cta{background:#eaf7ff;border-top:1px solid #ccebf8;border-bottom:1px solid #ccebf8}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:25px}
.cta h2{color:var(--deep);margin:0}

footer{background:#052f53;color:#d8e8f3}
.footer-grid{max-width:1200px;margin:auto;padding:38px 20px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.footer-logo{width:220px;filter:brightness(0) invert(1)}
footer h3{color:#fff;margin-top:0;font-size:16px}
footer a{display:block;color:#d8e8f3;font-size:13px;padding:3px 0}
.copyright{background:#075084;text-align:center;padding:12px;font-size:12px}

@media(max-width:850px){
  .header-top{flex-direction:column}
  .logo{width:245px}
  .search{width:100%}
  .nav{display:none}
  .mobile-nav{display:flex}
  .hero-grid,.video-grid{grid-template-columns:1fr}
  .cards,.lesson-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){
  .container{padding:0 15px}
  .hero-grid{padding:45px 15px}
  .cards,.lesson-grid,.practice,.footer-grid{grid-template-columns:1fr}
  .hero-actions,.cta-inner{flex-direction:column;align-items:stretch}
}