:root{--ink:#14173a;--ink2:#1b1f4b;--txt:#232742;--mut:#6b7090;--line:#e6e8f2;--bg:#f6f7fb;--card:#fff;--lime:#c6f432;--lime2:#a8d81a;--vio:#6c5cff;--amb:#ffb020;--red:#ef4b5f;--grn:#18b26b;--r:18px}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font:16px/1.55 Inter,system-ui,sans-serif;color:var(--txt);background:var(--bg)}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-family:Unbounded,Inter,sans-serif;color:var(--ink);line-height:1.15;letter-spacing:-.01em}
h1{font-size:clamp(32px,5.2vw,62px)}h2{font-size:clamp(24px,3.2vw,38px)}h3{font-size:19px}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.row{display:flex;align-items:center;gap:14px}
.mut{color:var(--mut)}
.sec{padding:72px 0}
.kick{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--vio);margin-bottom:12px}
.kick:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--vio)}
.lead{font-size:18px;color:var(--mut);max-width:620px;margin-top:14px}

/* header */
.top{position:sticky;top:0;z-index:30;background:rgba(246,247,251,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.top .row{height:68px}
.logo{display:flex;align-items:center;gap:10px;font-family:Unbounded;font-size:17px;color:var(--ink);margin-right:auto;white-space:nowrap}
.logo b{font-weight:800}
.mark{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;background:var(--ink2);color:var(--lime);font-size:13px;font-weight:800}
.nav{display:flex;gap:24px;font-weight:500;color:#41466a;margin-right:10px}
.nav a:hover,.nav a.on{color:var(--vio)}
.burger{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer}
.burger i{display:block;width:22px;height:2px;background:var(--ink);margin:5px auto;border-radius:2px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 22px;border-radius:14px;background:var(--ink2);color:#fff;font-weight:600;border:0;cursor:pointer;font-size:15px;transition:transform .15s,box-shadow .15s,background .15s}
.btn:hover{transform:translateY(-1px);box-shadow:0 10px 24px -10px rgba(27,31,75,.6)}
.btn.lime{background:var(--lime);color:var(--ink)}
.btn.ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.btn.ghost:hover{border-color:var(--ink);box-shadow:none}
.btn.sm{padding:10px 16px;font-size:14px;border-radius:12px}
.btn[disabled]{opacity:.5;pointer-events:none}

/* hero */
.hero{background:radial-gradient(900px 500px at 85% 10%,rgba(108,92,255,.35),transparent 60%),radial-gradient(700px 400px at 0% 100%,rgba(198,244,50,.18),transparent 60%),var(--ink);color:#fff;padding:84px 0 92px;overflow:hidden}
.hero h1{color:#fff}.hero h1 em{font-style:normal;color:var(--lime)}
.hero .lead{color:#b9bde0}
.hgrid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero .acts{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.hero .btn.ghost{color:#fff;border-color:rgba(255,255,255,.25)}
.stats{display:flex;gap:28px;margin-top:40px;flex-wrap:wrap}
.stats b{display:block;font-family:Unbounded;font-size:26px;color:var(--lime)}
.stats span{font-size:13px;color:#9da2cc}
.demo{background:#fff;color:var(--txt);border-radius:24px;padding:22px;box-shadow:0 30px 80px -30px rgba(0,0,0,.6);transform:rotate(1.5deg)}
.demo .q{font-family:Unbounded;font-size:22px;color:var(--ink);margin:10px 0 16px}
.demo .opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.demo .tag{font-size:12px;font-weight:700;color:var(--vio);letter-spacing:.08em;text-transform:uppercase}
.demo .bar{height:8px;border-radius:8px;background:var(--line);margin-top:18px;overflow:hidden}.demo .bar i{display:block;height:100%;width:62%;background:linear-gradient(90deg,var(--vio),var(--lime))}
.opt{padding:13px 14px;border:1.5px solid var(--line);border-radius:12px;background:#fff;cursor:pointer;font-weight:600;text-align:left;font-size:15px;color:var(--ink);transition:.15s}
.opt:hover{border-color:var(--vio)}
.opt.ok{border-color:var(--grn);background:#e9f9f1}.opt.bad{border-color:var(--red);background:#fdecef}

/* cards */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;transition:transform .15s,box-shadow .15s}
a.card:hover{transform:translateY(-3px);box-shadow:0 18px 40px -22px rgba(20,23,58,.35)}
.course .ic{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;font-size:24px;margin-bottom:16px}
.course p{color:var(--mut);font-size:14.5px;margin:8px 0 16px;min-height:66px}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{font-size:12.5px;font-weight:600;padding:5px 10px;border-radius:999px;background:var(--bg);color:#4b5075}
.price{display:flex;align-items:baseline;justify-content:space-between;margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
.price b{font-family:Unbounded;font-size:18px;color:var(--ink)}
.price small{color:var(--mut)}
.feat .n{font-family:Unbounded;font-size:13px;color:var(--vio);margin-bottom:10px}
.feat p{color:var(--mut);font-size:14.5px;margin-top:8px}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s}
.step{position:relative;padding-top:56px}
.step:before{counter-increment:s;content:counter(s);position:absolute;top:0;left:0;width:40px;height:40px;border-radius:12px;background:var(--lime);color:var(--ink);font-family:Unbounded;display:grid;place-items:center}
.step p{color:var(--mut);font-size:14.5px;margin-top:6px}

/* course page */
.chead{background:var(--ink);color:#fff;padding:56px 0}
.chead h1{color:#fff;font-size:clamp(28px,4vw,46px)}
.chead .lead{color:#b9bde0}
.crumbs{font-size:14px;color:#9da2cc;margin-bottom:16px}.crumbs a:hover{color:#fff}
.cgrid{display:grid;grid-template-columns:1fr 340px;gap:28px;align-items:start}
.side{position:sticky;top:88px}
.mod{border:1px solid var(--line);border-radius:16px;background:#fff;margin-bottom:12px;overflow:hidden}
.mod h3{font-size:16px;padding:16px 18px;background:#fbfbfe;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:10px}
.les{display:flex;align-items:center;gap:12px;padding:13px 18px;border-bottom:1px solid var(--line);font-size:15px}
.les:last-child{border-bottom:0}
.les .st{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:13px;flex:none;background:var(--bg);color:var(--mut)}
.les.done .st{background:var(--grn);color:#fff}
.les .go{margin-left:auto;font-size:13px;font-weight:600;color:var(--vio)}
.les.lock{color:#9aa0bd}.les.lock .go{color:#9aa0bd}
.pbar{height:8px;border-radius:8px;background:var(--line);overflow:hidden}.pbar i{display:block;height:100%;background:linear-gradient(90deg,var(--vio),var(--lime2));border-radius:8px}

/* lesson */
.lesson{max-width:820px;margin:0 auto}
.theory{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px;margin:22px 0}
.theory h3{margin:18px 0 8px}.theory h3:first-child{margin-top:0}
.theory p,.theory li{color:#3b4060;margin:6px 0}.theory ul{padding-left:20px}
.formula{font-family:ui-monospace,Menlo,monospace;background:#f2f1ff;color:var(--ink);padding:12px 16px;border-radius:12px;margin:10px 0;font-size:16px;overflow-x:auto}
.ex{border-left:4px solid var(--lime2);background:#f8fde9;padding:12px 16px;border-radius:0 12px 12px 0;margin:10px 0}
.prac{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px}
.prac .top2{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px;font-size:14px;color:var(--mut)}
.prac .q{font-family:Unbounded;font-size:clamp(20px,3vw,28px);color:var(--ink);margin:18px 0 22px}
.ans{display:flex;gap:10px}
.ans input{flex:1;padding:15px 16px;border-radius:14px;border:1.5px solid var(--line);font-size:18px;font-family:inherit;outline:none}
.ans input:focus{border-color:var(--vio)}
.fb{margin-top:16px;padding:14px 16px;border-radius:14px;font-weight:500;display:none}
.fb.ok{display:block;background:#e9f9f1;color:#0d7a48}.fb.bad{display:block;background:#fdecef;color:#b3243a}
.dots{display:flex;gap:6px;margin-top:20px;flex-wrap:wrap}.dots i{width:22px;height:8px;border-radius:6px;background:var(--line)}.dots i.ok{background:var(--grn)}.dots i.bad{background:var(--red)}.dots i.cur{background:var(--vio)}
.result{text-align:center;padding:20px 0}
.result .big{font-family:Unbounded;font-size:56px;color:var(--ink)}

/* forms */
.form{display:grid;gap:14px}
.form label{font-size:14px;font-weight:600;color:var(--ink)}
.form input,.form select,.form textarea{width:100%;padding:14px 15px;border-radius:13px;border:1.5px solid var(--line);font:inherit;background:#fff;outline:none;margin-top:6px}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--vio)}
.check{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--mut);font-weight:400!important}
.check input{width:auto;margin-top:3px}
.hp{position:absolute;left:-9999px}

/* cabinet */
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:22px 0}
.kpi b{display:block;font-family:Unbounded;font-size:28px;color:var(--ink)}.kpi span{font-size:13px;color:var(--mut)}
.cert{background:linear-gradient(135deg,#fff,#f7f5ff);border:2px solid var(--ink);border-radius:20px;padding:46px;text-align:center;max-width:820px;margin:20px auto;position:relative}
.cert:before{content:"";position:absolute;inset:10px;border:1px dashed #b9b4f5;border-radius:14px;pointer-events:none}
.cert h1{font-size:34px;margin:14px 0}
.cert .who{font-family:Unbounded;font-size:28px;color:var(--vio);margin:16px 0}

/* faq */
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:10px;padding:16px 20px}
.faq summary{cursor:pointer;font-weight:600;color:var(--ink);list-style:none;display:flex;justify-content:space-between}
.faq summary:after{content:"+";font-size:22px;line-height:1;color:var(--vio)}
.faq details[open] summary:after{content:"–"}
.faq p{color:var(--mut);margin-top:10px}

/* prices */
.plan{display:flex;flex-direction:column}
.plan.hot{background:var(--ink);color:#fff;border-color:var(--ink)}.plan.hot h3{color:#fff}.plan.hot .mut{color:#b9bde0}
.plan .pp{font-family:Unbounded;font-size:28px;margin:14px 0 4px}
.plan ul{list-style:none;margin:16px 0 22px;display:grid;gap:8px;font-size:14.5px}
.plan li:before{content:"✓ ";color:var(--lime2);font-weight:700}
.plan .btn{margin-top:auto}

/* misc */
.banner{background:var(--ink);color:#fff;border-radius:26px;padding:44px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.banner h2{color:#fff}.banner p{color:#b9bde0;margin-top:8px}
.foot{background:var(--ink);color:#c5c9ea;padding:56px 0 24px;margin-top:40px}
.foot .logo{color:#fff;margin-bottom:12px}.foot .mark{background:var(--lime);color:var(--ink)}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:24px}
.fgrid h4{color:#fff;font-size:14px;margin-bottom:12px}
.fgrid>div>a:not(.logo),.fgrid>div>span{display:block;font-size:14px;margin:6px 0}.fgrid a:hover{color:var(--lime)}
.foot .mut{color:#8e93bf;font-size:14px;max-width:300px}
.copy{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid rgba(255,255,255,.1);margin-top:36px;padding-top:20px;font-size:13px;color:#8e93bf}
.copy a{color:#fff;text-decoration:underline}
#toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(30px);background:var(--ink);color:#fff;padding:13px 20px;border-radius:14px;font-weight:500;opacity:0;transition:.25s;z-index:50;pointer-events:none;max-width:90vw}
#toast.on{opacity:1;transform:translateX(-50%)}
.empty{text-align:center;padding:40px;color:var(--mut)}

@media (max-width:980px){
  .hgrid,.cgrid{grid-template-columns:1fr}.demo{transform:none}.side{position:static}
  .grid3,.grid4,.steps,.kpis{grid-template-columns:1fr 1fr}.fgrid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .nav{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:16px 20px;gap:14px;border-bottom:1px solid var(--line)}
  .nav.open{display:flex}.burger{display:block}#cabBtn{display:none}
  .logo{font-size:15px}.top .btn.sm{padding:9px 12px}
  .grid3,.grid4,.steps{grid-template-columns:1fr}.sec{padding:52px 0}.hero{padding:56px 0 64px}
  .demo .opts{grid-template-columns:1fr}.ans{flex-direction:column}.banner{padding:28px}.cert{padding:28px 18px}
}
@media print{.top,.foot,.noprint{display:none!important}body{background:#fff}.cert{margin:0 auto;box-shadow:none}}