/* exxam.ru — двоичный калькулятор: страничный слой поверх base.css.
   Каркас, тема и токены — из base.css; здесь только калькулятор. Скоуп body.counter. */

body.counter .doc-page{position:relative;z-index:2;max-width:720px;margin:0 auto;padding:20px 16px 60px}
body.counter .doc-page>header{margin:4px 0 0}
body.counter h1{font-size:20px;margin:6px 0 2px}
body.counter .note{color:var(--muted);font-size:13px}
body.counter .card{padding:18px;margin-top:16px}
body.counter .display{text-align:center}
body.counter .dec{font-size:44px;font-weight:800;color:var(--accent);letter-spacing:1px}
body.counter .dec .unit{font-size:16px;color:var(--muted);font-weight:600}
body.counter .bin-str{font-family:var(--mono);font-size:19px;color:var(--ink);margin-top:2px;letter-spacing:2px}
body.counter .bits{display:flex;gap:6px;justify-content:center;margin:18px 0 6px;flex-wrap:wrap}
body.counter .bitw{display:flex;flex-direction:column;align-items:center;gap:4px}
body.counter .bit{width:54px;height:54px;border-radius:10px;border:2px solid var(--off);
  display:flex;align-items:center;justify-content:center;font-family:var(--mono);
  font-size:24px;font-weight:800;color:var(--dim);background:var(--panel);
  cursor:pointer;user-select:none;transition:all .12s}
body.counter .display button.bit{padding:0}
body.counter .bit.on{background:var(--on-bg);border-color:var(--on);color:var(--on);box-shadow:0 0 0 3px rgba(125,99,150,.14)}
body.counter .bit:hover{transform:translateY(-1px)}
body.counter .bitlab{font-family:var(--mono);font-size:11px;color:var(--muted)}
body.counter .controls{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:14px}
body.counter .display button{cursor:pointer;font-family:inherit;border-radius:10px;border:1px solid var(--line);
  background:var(--panel);color:var(--ink);font-size:15px;font-weight:700;padding:10px 18px}
body.counter .display button:hover{background:var(--bg)}
body.counter .display button.minus,body.counter .display button.plus{min-width:70px;background:var(--accent);border-color:var(--accent);color:var(--panel);font-size:20px}
body.counter .display button:disabled{opacity:.35;cursor:not-allowed}
body.counter .legend{display:flex;gap:16px;justify-content:center;margin-top:12px;flex-wrap:wrap}
body.counter .legend span{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:6px}
body.counter .sw{display:inline-block;width:16px;height:16px;border-radius:5px}
body.counter .sw.sw-on{background:var(--on-bg);border:2px solid var(--on)}
body.counter .sw.sw-off{background:#fff;border:2px solid var(--off)}
body.counter .sw.sw-click{background:#f7eef2;border:1px solid #eddde4}
body.counter .hint{text-align:center;color:var(--muted);font-size:12.5px;margin-top:12px}
body.counter kbd{background:var(--violet-soft);border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:1px 6px;font-family:inherit;font-size:11px}

/* FAQ на странице калькулятора (чипы чисел — общий класс .fx из base.css) */
body.counter .faq-card{margin-top:22px}
body.counter .faq details{border:1px solid var(--line);border-radius:12px;margin:8px 0;background:var(--panel)}
body.counter .faq summary{cursor:pointer;font-weight:700;padding:13px 15px;list-style:none;display:flex;align-items:center;gap:9px}
body.counter .faq summary::-webkit-details-marker{display:none}
body.counter .faq summary::before{content:"▸";color:var(--violet);transition:transform .15s;flex:none}
body.counter .faq details[open] summary::before{transform:rotate(90deg)}
body.counter .faq .body{padding:0 16px 15px 41px;color:var(--ink);line-height:1.6}

@media (max-width:560px){
  body.counter .doc-page{padding:14px 10px 40px}
  body.counter .card{padding:14px 10px}
  body.counter .dec{font-size:38px}
  body.counter .bits{gap:4px}
  body.counter .bit{width:42px;height:46px;font-size:19px;border-radius:9px}
  body.counter .bitlab{font-size:10px}
  body.counter .controls button{padding:9px 14px;font-size:14px}
}
@media (max-width:400px){
  body.counter .bit{width:36px;height:40px;font-size:16px}
  body.counter .bitlab{font-size:9px}
  body.counter .bin-str{font-size:16px}
}
@media (max-width:340px){
  body.counter .bit{width:32px;height:36px;font-size:14px;border-radius:7px}
  body.counter .legend{gap:8px}
}