:root{--p:#008080;--pd:#005f60;--tint:#dbebeb;--ink:#1a1b1f;--mut:#4b5b5b;--bg:#fff;--line:#c9dddd;--warn:#fff4d6;--ok:#0a7a4a;--bad:#b3261e}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Roboto,system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--pd)}
h1,h2,h3{line-height:1.15;margin:0 0 .5em;text-wrap:balance}
h2{font-size:clamp(1.5rem,3vw,2.1rem);color:var(--p);font-weight:700}
h3{font-size:1.15rem;color:var(--pd)}
.wrap{max-width:1120px;margin:0 auto;padding-inline:max(20px,env(safe-area-inset-left,0px)) max(20px,env(safe-area-inset-right,0px))}
.demo-strip{background:var(--warn);color:#4a3b00;font-size:.8rem;padding:6px 0;text-align:center}
.demo-strip .wrap{padding-block:0}
header.top{background:var(--p);color:#fff;position:sticky;top:0;z-index:20}
header.top .wrap{display:flex;align-items:center;gap:20px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:700;font-size:1.25rem;letter-spacing:.02em}
.brand img{width:40px;height:40px}
nav.main{display:flex;gap:4px;margin-left:auto;align-items:center;flex-wrap:wrap}
nav.main a,nav.main button.link{color:#fff;text-decoration:none;padding:8px 12px;border-radius:8px;font-size:.95rem;background:none;border:0;cursor:pointer;font-family:inherit}
nav.main a:hover,nav.main a.on{background:rgba(255,255,255,.16)}
.pill{border:2px solid #fff;border-radius:10px}
.btn{display:inline-block;background:var(--p);color:#fff;border:0;border-radius:10px;padding:11px 20px;font:600 .98rem Roboto,sans-serif;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--pd)}
.btn.white{background:#fff;color:var(--pd)}
.btn.ghost{background:transparent;border:2px solid var(--p);color:var(--pd)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.sm{padding:7px 14px;font-size:.88rem}
.hero{background:var(--p);color:#fff;overflow:hidden;position:relative}
.hero .wrap{display:grid;grid-template-columns:1.3fr .7fr;gap:20px;align-items:center;min-height:380px;padding-block:44px}
.hero h1{font-size:clamp(2rem,4.6vw,3.4rem);font-weight:700;margin-bottom:.4em}
.hero h1 span{font-weight:300}
.hero p{max-width:560px;font-size:1.1rem;opacity:.95}
.bigx{font-weight:700;font-size:clamp(14rem,30vw,26rem);line-height:.8;color:#fff;text-align:right;user-select:none;margin-right:-1rem;margin-bottom:-2rem}
section.block{padding-block:48px}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px}
.tile{background:var(--tint);border-radius:16px;padding:22px;text-decoration:none;color:var(--ink);display:block;box-shadow:0 2px 8px rgba(0,0,0,.08);transition:transform .15s}
.tile:hover{transform:translateY(-3px)}
.tile svg{width:34px;height:34px;stroke:var(--p);fill:none;stroke-width:1.7}
.tile h3{margin-top:10px}
.tile p{margin:0;color:var(--mut);font-size:.95rem}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:12px}
.step{background:#fff;border-radius:12px;padding:14px 16px;display:flex;gap:14px;align-items:center;box-shadow:0 1px 4px rgba(0,0,0,.08)}
.step b{font-size:2.2rem;color:var(--p);line-height:1}
.panel{background:var(--tint);border-radius:18px;padding:26px;box-shadow:0 2px 8px rgba(0,0,0,.07)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:10px;min-width:0}
.card h3{margin:0}
.card .meta{display:flex;gap:6px;flex-wrap:wrap}
.tag{display:inline-block;background:var(--tint);color:var(--pd);border-radius:999px;padding:2px 10px;font-size:.78rem;font-weight:500}
.tag.warn{background:var(--warn);color:#6b4e00}
.tag.ok{background:#dff4e8;color:var(--ok)}
.tag.lock{background:#eee;color:#555}
.bar{height:8px;background:#e5eeee;border-radius:8px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--p)}
.lesson{border-top:1px solid var(--line);padding:22px 0}
.lesson:first-child{border-top:0}
.lesson .md{max-width:70ch}
.md p{margin:.5em 0}.md ul,.md ol{padding-left:1.3em}.md li{margin:.25em 0}
.src{font-size:.82rem;color:var(--mut)}
.q{border:1px solid var(--line);border-radius:14px;padding:16px;margin:14px 0}
.q label{display:flex;gap:10px;padding:8px 10px;border-radius:8px;cursor:pointer;align-items:flex-start}
.q label:hover{background:var(--tint)}
.q.good{border-color:var(--ok)}.q.bad{border-color:var(--bad)}
.fb{font-size:.9rem;margin-top:8px}
table.t{width:100%;border-collapse:collapse;font-size:.92rem}
table.t th,table.t td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
table.t th{color:var(--pd);font-weight:600}
.scroll-x{overflow-x:auto}
input[type=text],input[type=email],input[type=password],textarea,select{width:100%;padding:11px 12px;border:2px solid var(--line);border-radius:10px;font:inherit;background:#fff;color:var(--ink)}
input:focus,textarea:focus{outline:none;border-color:var(--p)}
.field{margin-bottom:12px}.field label{display:block;font-weight:500;margin-bottom:4px}
.login{max-width:440px;margin:60px auto;background:#fff;border-radius:18px;padding:28px;box-shadow:0 4px 24px rgba(0,0,0,.12)}
.chat{display:flex;flex-direction:column;gap:12px;min-height:320px}
.msg{max-width:78%;padding:12px 16px;border-radius:16px;white-space:pre-wrap;overflow-wrap:anywhere}
.msg.u{align-self:flex-end;background:var(--p);color:#fff;border-bottom-right-radius:4px}
.msg.a{align-self:flex-start;background:var(--tint);border-bottom-left-radius:4px}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.chips button{background:#fff;border:1px solid var(--p);color:var(--pd);border-radius:999px;padding:6px 14px;cursor:pointer;font:inherit;font-size:.88rem}
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:18px;align-items:stretch}
.plan{background:#fff;border:2px solid var(--line);border-radius:20px;padding:24px;display:flex;flex-direction:column;gap:8px;position:relative}
.plan.rec{border-color:var(--p);box-shadow:0 8px 28px rgba(0,128,128,.22)}
.plan .badge{position:absolute;top:-13px;left:20px;background:var(--p);color:#fff;border-radius:999px;padding:4px 14px;font-size:.78rem;font-weight:700;letter-spacing:.04em}
.price{font-size:2.3rem;font-weight:700;color:var(--p)}
.was{text-decoration:line-through;color:var(--mut)}
.chk{width:18px;height:18px;stroke:var(--p);fill:none;stroke-width:2.6;vertical-align:middle}
.dash{color:#aab}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:var(--ink);color:#fff;padding:12px 20px;border-radius:12px;z-index:60;max-width:90vw}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}
.modal .box{background:#fff;border-radius:18px;padding:26px;max-width:480px;width:100%;max-height:90vh;overflow:auto}
footer.foot{background:var(--ink);color:#d7e3e3;margin-top:56px;padding-block:28px;font-size:.88rem}
footer.foot a{color:#fff}
.fab{position:fixed;right:max(18px,env(safe-area-inset-right,0px));bottom:max(18px,env(safe-area-inset-bottom,0px));width:58px;height:58px;border-radius:50%;background:var(--p);border:0;box-shadow:0 6px 20px rgba(0,0,0,.3);cursor:pointer;z-index:40}
.fab svg{width:26px;height:26px;stroke:#fff;fill:none;stroke-width:2}
.crumbs{font-size:.88rem;margin-bottom:12px}
.cert{border:3px double var(--p);border-radius:16px;padding:34px;text-align:center;background:#fff}
.cert h2{font-size:2rem}
.loading{padding:60px 0;text-align:center;color:var(--mut)}
@media(max-width:820px){.hero .wrap{grid-template-columns:1fr}.bigx{display:none}header.top .wrap{flex-wrap:wrap;padding-block:8px}nav.main{margin-left:0;width:100%}.msg{max-width:92%}}