:root{--blue:#2563eb;--purple:#7c3aed;--green:#059669;--orange:#ea580c;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--bg:#f8fafc;--white:#fff}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:"Segoe UI",Tahoma,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.8}a{text-decoration:none;color:inherit}.wrap{width:min(1120px,92%);margin:auto}
.topbar{height:72px;background:#ffffffeb;border-bottom:1px solid var(--line);backdrop-filter:blur(12px);position:sticky;top:0;z-index:20}.nav{height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-size:21px;font-weight:900;white-space:nowrap}.brand span{color:var(--blue)}.brand b{color:var(--blue);font-size:13px}.nav nav{display:flex;gap:22px;font-size:14px;font-weight:700}.nav nav a:hover,.nav nav .active{color:var(--blue)}.btn{border:1px solid transparent;border-radius:12px;padding:10px 17px;font-weight:800;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.btn.primary{background:var(--blue);color:white;box-shadow:0 8px 22px #2563eb24}.btn.ghost{border-color:var(--line);background:white}.btn.light{background:white;color:var(--blue)}.big{padding:13px 21px}
.hero{padding:90px 0 75px;background:radial-gradient(circle at 8% 20%,#dbeafe 0,transparent 33%),linear-gradient(135deg,#eff6ff,#faf5ff)}.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:55px;align-items:center}.eyebrow{display:inline-block;background:#dbeafe;color:#1d4ed8;padding:4px 12px;border-radius:99px;font-size:13px;font-weight:900;margin-bottom:14px}.hero h1{font-size:clamp(40px,5.5vw,65px);line-height:1.15;margin:0 0 18px}.hero h1 em{font-style:normal;color:var(--blue)}.hero p{font-size:18px;color:#475569;max-width:650px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin:25px 0}.stats{display:flex;gap:35px;margin-top:30px}.stats strong{display:block;font-size:24px}.stats small{color:var(--muted)}
.hero-code,.playground{background:#07101f;border-radius:20px;overflow:hidden;box-shadow:0 28px 65px #0f172a2e}.terminal-head,.editor-bar{height:48px;background:#101b2d;color:#94a3b8;display:flex;align-items:center;gap:7px;padding:0 17px}.terminal-head i{width:9px;height:9px;border-radius:50%;background:#64748b}.terminal-head span{margin-right:auto;font:12px Consolas,monospace}.hero-code pre{padding:24px;margin:0;direction:ltr;text-align:left;color:#dbeafe;font:15px/1.9 Consolas,monospace}.hero-code pre b{color:#c084fc}.hero-code pre u{color:#60a5fa;text-decoration:none}.hero-code pre s{color:#86efac;text-decoration:none}.terminal-result{margin:0 22px 22px;background:#111c2d;color:#86efac;padding:12px;border-radius:10px;direction:ltr;font:14px Consolas,monospace}
.section{padding:78px 0}.soft{background:#f1f5f9}.section-title{text-align:center;margin-bottom:38px}.section-title span{color:var(--blue);font-weight:900}.section-title h2{font-size:34px;margin:3px 0}.section-title p{color:var(--muted)}.cards{display:grid;gap:18px}.cards.four{grid-template-columns:repeat(4,1fr)}.feature,.card{background:white;border:1px solid var(--line);border-radius:18px;padding:23px}.feature{transition:.2s}.feature:hover{transform:translateY(-5px);box-shadow:0 15px 35px #0f172a0c}.feature h3{margin:8px 0 5px}.feature p,.muted{color:var(--muted);font-size:14px}.feature b,.link{color:var(--blue);font-size:14px}.ico{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;font-size:23px}.blue{background:#eff6ff}.purple{background:#f5f3ff}.green{background:#ecfdf5}.orange{background:#fff7ed}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:65px;align-items:center}.two-col h2{font-size:34px}.checks{list-style:none;padding:0}.checks li{margin:12px 0}.checks li:before{content:"✓";display:inline-grid;place-items:center;width:25px;height:25px;border-radius:50%;background:#dcfce7;color:#15803d;margin-left:9px;font-weight:900}.roadmap{display:grid;gap:12px}.roadmap div{background:white;border:1px solid var(--line);padding:14px 18px;border-radius:13px;display:flex;align-items:center;gap:15px}.roadmap b{background:var(--ink);color:white;border-radius:9px;padding:3px 9px}
.cta{padding:75px 0;text-align:center;background:linear-gradient(135deg,#1d4ed8,#6d28d9);color:white}.cta h2{font-size:38px;margin:0}.cta p{color:#dbeafe}.cta .btn{margin-top:10px}
footer{background:#0b1220;color:#94a3b8;padding:32px 0}.footer{display:flex;align-items:center;justify-content:space-between;gap:25px}.footer strong{color:white}.footer a{margin-left:20px}.footer p{margin:0;font-size:13px}
.page{padding:55px 0 80px;min-height:calc(100vh - 180px)}.page-head{text-align:center;margin-bottom:35px}.page-head h1{font-size:43px;margin:5px 0}.page-head p{color:var(--muted)}.lesson-layout{display:grid;grid-template-columns:280px 1fr;gap:25px;align-items:start}.side{background:white;border:1px solid var(--line);border-radius:16px;padding:14px;position:sticky;top:90px}.side h3{font-size:13px;color:var(--muted);margin:8px}.side a{display:block;padding:9px 11px;border-radius:9px;font-size:14px}.side a:hover,.side .selected{background:#eff6ff;color:var(--blue);font-weight:800}.lesson{background:white;border:1px solid var(--line);border-radius:18px;padding:35px}.lesson-top{display:flex;justify-content:space-between;color:var(--muted);font-size:13px}.lesson h2{font-size:32px}.lesson h3{margin-top:28px}.lesson p{color:#475569}.block-code{direction:ltr;text-align:left;background:#07101f;color:#dbeafe;border-radius:12px;padding:20px;font:15px/1.8 Consolas,monospace;overflow:auto}.tip{background:#eff6ff;border-right:4px solid var(--blue);padding:15px 18px;border-radius:9px;margin:20px 0}.lesson-actions{display:flex;justify-content:space-between;margin-top:30px}
.quiz{max-width:800px;margin:auto}.quiz-head{display:flex;justify-content:space-between;color:var(--muted);font-size:13px}.quiz h2{margin:25px 0}.answers{display:grid;gap:10px}.answers button{background:white;border:1px solid var(--line);padding:14px;text-align:right;border-radius:11px;font-size:15px;cursor:pointer}.answers button:hover{border-color:var(--blue)}.answers .correct{background:#dcfce7;border-color:#22c55e}.answers .wrong{background:#fee2e2;border-color:#ef4444}.feedback{min-height:35px;margin:15px 0;font-weight:800}.grid.two-cards{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:25px}.tag{display:inline-block;background:#dbeafe;color:#1d4ed8;padding:2px 9px;border-radius:99px;font-size:11px;font-weight:900}.purple-tag{background:#ede9fe;color:#6d28d9}.green-tag{background:#dcfce7;color:#15803d}
.project-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.project-icon{font-size:40px;margin-bottom:8px}.project h2{margin:7px 0}.project p{color:var(--muted)}.chips{display:flex;gap:7px;margin:16px 0;flex-wrap:wrap}.chips i{font:12px Consolas,monospace;background:#f1f5f9;padding:4px 8px;border-radius:7px;color:#475569}
.editor-bar{justify-content:space-between}.editor-bar button{background:#16a34a;color:white;border:0;padding:7px 14px;border-radius:8px;font-weight:800;cursor:pointer}.playground textarea{display:block;width:100%;min-height:330px;border:0;outline:0;resize:vertical;background:#07101f;color:#dbeafe;padding:22px;direction:ltr;text-align:left;font:15px/1.8 Consolas,monospace}.console{border-top:1px solid #24324a;background:#0c1728;color:#94a3b8;padding:15px}.console pre{color:#86efac;margin:5px 0;direction:ltr;text-align:left;font:14px Consolas,monospace}.page .tip{margin-top:20px}
@media(max-width:850px){.nav nav{display:none}.hero-grid,.two-col{grid-template-columns:1fr}.cards.four{grid-template-columns:1fr 1fr}.lesson-layout{grid-template-columns:1fr}.side{position:static}.project-grid,.grid.two-cards{grid-template-columns:1fr}.footer{flex-direction:column;text-align:center}.hero{padding-top:55px}}
@media(max-width:520px){.cards.four{grid-template-columns:1fr}.stats{gap:20px}.hero h1{font-size:40px}.lesson{padding:22px}.page-head h1{font-size:34px}}

/* Mobile navigation */
.menu-toggle{
  display:none;
  border:1px solid var(--line);
  background:white;
  color:var(--ink);
  width:42px;height:42px;
  border-radius:10px;
  font-size:22px;
  cursor:pointer;
  align-items:center;
  justify-content:center;
}
@media(max-width:850px){
  .nav{position:relative}
  .menu-toggle{display:flex;margin-right:auto}
  .nav nav{
    display:none;
    position:absolute;
    top:64px;
    right:0;
    left:0;
    background:white;
    border:1px solid var(--line);
    border-radius:14px;
    padding:10px;
    box-shadow:0 18px 35px #0f172a18;
    flex-direction:column;
    gap:4px;
  }
  .nav nav.mobile-open{display:flex}
  .nav nav a{
    display:block;
    padding:11px 14px;
    border-radius:9px;
  }
  .nav nav a:hover,.nav nav .active{background:#eff6ff}
  .nav > .btn.primary{display:none}
}
@media(max-width:520px){
  .brand{font-size:18px}
  .menu-toggle{width:40px;height:40px}
}

/* Keep the main CTA visible on mobile */
@media(max-width:850px){
  .nav > .btn.primary{
    display:inline-flex;
    padding:8px 12px;
    font-size:12px;
    white-space:nowrap;
    box-shadow:none;
  }
}
.mnu{font-size: 20px;}