/* Aviator — шаблон "aviator". Палітра з референсів: чорний/графіт + червоний (educator.in.ua, hooleegang.com). Без зовнішніх шрифтів і фреймворків. */
:root{
  --r:#d90000;--r-hover:#f01414;--r-text:#ff5a52;--r-dark:#7d0000;
  --bg:#0b0b0d;--card:#151518;--card-2:#1c1c20;--text:#d3d6d8;--muted:#a3a7ab;--line:#2a2a2f;
  --radius:6px;--max:1080px;
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font:400 17px/1.65 var(--font);color:var(--text);background:var(--bg)}
img{max-width:100%;height:auto;display:block}
a{color:var(--r-text);text-decoration-color:rgba(255,90,82,.45);text-decoration-thickness:2px;text-underline-offset:3px}
a:hover{color:#fff;text-decoration-color:#fff}
:focus-visible{outline:3px solid #fff;outline-offset:3px}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:0;background:#fff;color:#000;padding:10px 16px;z-index:100}
.skip:focus{left:0}

/* Кнопки */
.btn{display:inline-block;padding:13px 28px;font-weight:800;text-decoration:none;text-align:center;line-height:1.2;color:#fff;background:var(--r);border-radius:var(--radius);box-shadow:0 4px 0 var(--r-dark);transition:background-color .15s,transform .15s,box-shadow .15s}
.btn:hover{background:var(--r-hover);color:#fff}
.btn:active{transform:translateY(3px);box-shadow:none}
.btn--ghost{background:transparent;border:2px solid var(--r);box-shadow:none;padding:11px 24px}
.btn--ghost:hover{background:var(--r)}
.btn--lg{font-size:1.2rem;padding:18px 44px}

/* Шапка + hero */
.hero{position:relative;isolation:isolate;color:#fff;background:#08080a;overflow:hidden}
.hero__bg{position:absolute;inset:0;z-index:-1;width:100%;height:100%;object-fit:cover;object-position:right center}
.hero::after{content:"";position:absolute;inset:0;z-index:-1;background:radial-gradient(ellipse 42% 78% at 50% 52%,rgba(8,8,10,.82) 0%,rgba(8,8,10,.5) 60%,rgba(8,8,10,0) 100%)}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0}
.nav__logo,.footer__logo{display:block;line-height:0}
.nav__logo img{width:auto;height:52px}
.footer__logo img{width:auto;height:44px}
.nav__menu{display:flex;gap:6px 22px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.nav__menu a{color:#fff;text-decoration:none;font-weight:600;font-size:.95rem}
.nav__menu a:hover{color:var(--r-text)}
.nav__actions{display:flex;gap:8px}
.nav__actions .btn{padding:11px 22px}
.nav__actions .btn--ghost{padding:9px 20px}
.hero__body{padding:56px 0 96px;max-width:720px;margin:0 auto;text-align:center}
.hero h1{margin:0 0 16px;font-size:clamp(1.9rem,5vw,3rem);line-height:1.15;font-weight:800}
.hero__lead{margin:0 auto 28px;max-width:600px;font-size:1.1rem;color:#ececec}
.hero__note{margin:14px 0 0;font-size:.85rem;color:#bdbdbd}

/* Контент */
.content{padding:48px 0 24px}
.content .container{max-width:860px}
.content h2{margin:2.4em 0 .8em;padding-bottom:.55em;font-size:clamp(1.4rem,3.4vw,1.9rem);line-height:1.25;color:#fff;background:linear-gradient(90deg,var(--r) 0 72px,var(--line) 72px) left bottom/100% 2px no-repeat}
.content h3{margin:1.6em 0 .4em;font-size:1.2rem;color:#fff}
.content p{margin:0 0 1em}
.content ul{margin:0 0 1.4em;padding:0;list-style:none}
.content ul li{position:relative;margin:0;padding:11px 0 11px 34px;border-bottom:1px dashed var(--line)}
.content ul li:last-child{border-bottom:0}
.content ul li::before{content:"";position:absolute;left:6px;top:1.05em;width:11px;height:11px;border-radius:2px;background:var(--r);transform:rotate(45deg)}
.toc{margin:0 0 28px;padding:20px;background:linear-gradient(135deg,rgba(217,0,0,.16),rgba(21,21,24,.9) 55%);border:1px solid var(--line);border-radius:14px}
.toc strong{display:block;margin-bottom:12px;font-size:.78rem;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:var(--muted)}
.toc ol{counter-reset:t;display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:8px;grid-auto-rows:1fr;margin:0;padding:0;list-style:none}
.toc li{counter-increment:t;display:flex}
.toc a{flex:1;display:flex;align-items:center;gap:12px;padding:10px 14px;color:#fff;text-decoration:none;font-weight:600;font-size:.95rem;line-height:1.3;background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:10px;transition:border-color .15s,background-color .15s}
.toc a::before{content:counter(t);flex:none;width:28px;height:28px;display:grid;place-items:center;border:2px solid var(--r);border-radius:50%;font-size:.8rem;font-weight:800;color:var(--r-text)}
.toc a:hover{border-color:var(--r);background:rgba(217,0,0,.14);color:#fff}
.steps{counter-reset:s;list-style:none;margin:0 0 1.4em;padding:0}
.steps li{counter-increment:s;position:relative;margin:0;padding:6px 0 32px 56px}
.steps li::before{content:"";position:absolute;left:17px;top:40px;bottom:4px;width:2px;background:linear-gradient(var(--r),var(--line))}
.steps li:last-child{padding-bottom:0}
.steps li:last-child::before{display:none}
.steps li::after{content:counter(s);position:absolute;left:0;top:0;width:36px;height:36px;display:grid;place-items:center;border:2px solid var(--r);border-radius:50%;background:var(--bg);font-weight:800;color:var(--r-text)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:0 0 1.2em}
.card{padding:20px;color:#fff;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);border-top:4px solid var(--r)}
.card h3{margin:0 0 .4em;font-size:1.05rem;color:var(--r-text)}
.card p{margin:0;font-size:.95rem;color:#d4d4d4}
.table-wrap{overflow-x:auto;margin:0 0 1.4em;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}
table{width:100%;border-collapse:collapse;min-width:480px}
caption{padding:12px 16px;text-align:left;font-weight:700;color:#fff}
th,td{padding:12px 16px;text-align:left;border-top:1px solid var(--line);vertical-align:top}
th{width:34%;background:var(--card-2);font-weight:700;color:#fff}
.cta{margin:2.4em 0;padding:32px 24px;text-align:center;color:#fff;border-radius:var(--radius);background:radial-gradient(120% 140% at 50% 120%,rgba(217,0,0,.35),var(--card) 70%);border:2px solid var(--r)}
.cta p{margin:0 0 16px;font-size:1.2rem;font-weight:700}
.note{margin:0 0 1.2em;padding:14px 18px;background:var(--card);border-left:4px solid var(--r);border-radius:var(--radius);color:var(--muted);font-size:.95rem}
details{margin:0 0 10px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
summary{cursor:pointer;padding:14px 18px;font-weight:700;color:#fff;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";flex:none;width:26px;height:26px;display:grid;place-items:center;border-radius:var(--radius);background:var(--r);color:#fff;font-size:1.2rem;line-height:1}
details[open] summary::after{content:"\2212"}
details p{padding:0 18px 16px;margin:0;color:var(--muted)}

/* Футер */
.footer{margin-top:48px;padding:40px 0 96px;color:#bdbdbd;background:#060607;border-top:1px solid var(--line);font-size:.9rem}
.footer .container{display:grid;gap:18px}
.footer__top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.footer a{color:#fff;text-decoration-color:var(--r)}
.footer__links{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none;margin:0;padding:0}
.footer p{margin:0}
.age{display:inline-grid;place-items:center;width:40px;height:40px;border:2px solid var(--r);border-radius:var(--radius);color:#fff;font-weight:800}

/* Липка червона кнопка на мобільних */
.sticky{display:none}

@media (max-width:900px){
  .nav{flex-wrap:wrap}
  .nav nav{order:3;width:100%;padding-top:8px;border-top:1px solid rgba(255,255,255,.15)}
  .nav__menu{justify-content:center}
  .hero__bg{object-position:62% center}
  .hero::after{background:linear-gradient(180deg,rgba(8,8,10,.7) 0%,rgba(8,8,10,.38) 50%,rgba(8,8,10,.15) 100%)}
  .hero__body{padding:32px 0 56px;max-width:none}
}
@media (max-width:600px){
  body{font-size:16px}
  .toc ol{columns:1}
  .nav{gap:10px}
  .nav__logo img{height:42px}
  .hero__body{text-shadow:0 2px 14px rgba(0,0,0,.85)}
  .nav__menu{gap:4px 14px}
  .nav__menu a{font-size:.85rem}
  .nav__actions .btn{padding:8px 12px;font-size:.85rem}
  .nav__actions .btn--ghost{padding:6px 10px}
  .sticky{display:block;position:fixed;z-index:50;left:0;right:0;bottom:0;padding:10px 16px;background:rgba(11,11,13,.96)}
  .sticky .btn{display:block}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}