/* ==========================================================================
   Физика наглядно — общий дизайн-слой для всех страниц
   Тёмная неон-glass тема, mobile-first, без внешних зависимостей
   ========================================================================== */
:root{
  --bg:#0b1020;
  --bg-2:#0e1428;
  --panel:#131a2e;
  --panel-2:#0e1526;
  --border:#26304d;
  --border-soft:#1d2745;
  --text:#e8ecf6;
  --muted:#93a0bd;
  --accent:#5aa7ff;
  --accent-2:#a78bfa;
  --good:#5ad17a;
  --radius:14px;
  --maxw:1000px;
  --shadow:0 12px 34px rgba(0,0,0,.38);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:
    radial-gradient(1100px 560px at 78% -12%, #16224a 0%, transparent 60%),
    var(--bg);
  color:var(--text);
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,Cantarell,sans-serif;
  line-height:1.55;
  min-height:100vh;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:var(--accent)}

/* ---------- Шапка / навигация ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(11,16,32,.82);
  backdrop-filter:saturate(140%) blur(10px);
  -webkit-backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--border-soft);
}
.site-header .bar{
  max-width:var(--maxw);margin:0 auto;
  display:flex;align-items:center;gap:12px;
  padding:12px 16px;
}
.brand{
  font-weight:800;font-size:1.05rem;letter-spacing:.2px;
  color:var(--text);text-decoration:none;white-space:nowrap;
  display:inline-flex;align-items:center;gap:8px;
}
.brand span{color:var(--muted);font-weight:600}
.site-nav{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
.site-nav a{
  color:var(--muted);text-decoration:none;font-size:.94rem;font-weight:600;
  padding:8px 12px;border-radius:9px;transition:.15s;white-space:nowrap;
}
.site-nav a:hover{color:var(--text);background:#1a2440}
.site-nav a[aria-current="page"]{color:var(--text);background:#1d2a4a;border:1px solid var(--border)}
.nav-toggle{
  display:none;margin-left:auto;
  width:44px;height:40px;border:1px solid var(--border);border-radius:10px;
  background:#141d34;cursor:pointer;position:relative;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:11px;width:22px;height:2px;background:var(--text);
  border-radius:2px;transition:.2s;
}
.nav-toggle span{top:19px}
.nav-toggle span::before{top:-7px}
.nav-toggle span::after{top:7px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

/* ---------- Каркас страницы ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:22px 16px 64px}
.crumbs{color:var(--muted);font-size:.85rem;margin:6px 0 14px}
.crumbs a{color:var(--accent);text-decoration:none}
.crumbs a:hover{text-decoration:underline}
.crumbs .sep{opacity:.5;margin:0 6px}

h1{font-size:clamp(1.5rem,4.5vw,2.15rem);margin:6px 0 8px;line-height:1.2}
h2{font-size:clamp(1.05rem,2.6vw,1.2rem);margin:0 0 10px}
.sub{color:var(--muted);margin:0 0 22px;font-size:clamp(.98rem,2.4vw,1.06rem)}
p{margin:8px 0}
.muted{color:var(--muted)}

/* ---------- Панели / сетки ---------- */
.panel{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
  padding:16px;margin-bottom:16px;
}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:16px}

/* ---------- Canvas сцена (адаптив) ---------- */
.stage{position:relative;width:100%}
.stage canvas{
  display:block;width:100%;height:auto;border-radius:10px;
  background:#05070f;touch-action:none;
}

/* ---------- Управление ---------- */
.controls{display:flex;flex-wrap:wrap;gap:14px 20px;align-items:center;margin-top:14px}
.ctrl{flex:1 1 260px;min-width:220px}
.ctrl label,.meter label{
  display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;
  font-size:.9rem;color:var(--muted);margin-bottom:6px;
}
.ctrl output,.meter output{color:var(--text);font-weight:700}
input[type=range]{width:100%;accent-color:var(--accent);height:26px}
select{
  background:var(--panel-2);color:var(--text);border:1px solid var(--border);
  border-radius:10px;padding:9px 12px;font-size:.92rem;max-width:100%;
}
button{
  background:var(--accent);color:#04122b;border:0;border-radius:10px;
  padding:11px 18px;font-weight:700;font-size:.95rem;cursor:pointer;transition:.15s;
}
button:hover{filter:brightness(1.06)}
button:active{transform:translateY(1px)}
button.sec{background:#1d2a4a;color:var(--text);border:1px solid var(--border)}
button.on{background:var(--accent);color:#04122b;border-color:var(--accent)}
button:disabled{opacity:.45;cursor:default;filter:none;transform:none}

.switch{
  display:inline-flex;align-items:center;gap:10px;background:var(--panel-2);
  border:1px solid var(--border);border-radius:10px;padding:8px 14px;cursor:pointer;
  user-select:none;font-size:.92rem;
}
.switch .dot{width:44px;height:24px;border-radius:999px;background:#33406a;position:relative;transition:.2s;flex-shrink:0}
.switch .dot::after{content:"";position:absolute;top:3px;left:3px;width:18px;height:18px;border-radius:50%;background:#fff;transition:.2s}
.switch.on .dot{background:var(--accent)}
.switch.on .dot::after{left:23px}

.meter{flex:1 1 260px;min-width:220px}
.barwrap{background:var(--panel-2);border:1px solid var(--border);border-radius:8px;height:16px;overflow:hidden}
.barwrap .bar{height:100%;width:0;border-radius:8px;transition:width .12s}

/* ---------- Инфо-элементы ---------- */
.badge{display:inline-block;background:#1d2a4a;border:1px solid var(--border);border-radius:999px;padding:6px 14px;font-size:.9rem}
.tag{display:inline-block;background:#1d2a4a;border:1px solid var(--border);border-radius:999px;padding:5px 12px;font-size:.85rem;margin:4px 6px 0 0}
.stats{display:flex;gap:10px 14px;flex-wrap:wrap;margin-top:12px}
.stat{background:var(--panel-2);border:1px solid var(--border);border-radius:10px;padding:8px 14px;font-size:.9rem}
.stat b{font-size:1.05rem}
.hint{background:#1a2440;border:1px solid #2e4270;border-radius:10px;padding:10px 14px;margin-top:10px;font-size:.92rem}
.swatch{width:46px;height:46px;border-radius:10px;border:1px solid var(--border);flex-shrink:0}
.step{display:flex;gap:10px;align-items:flex-start;margin:10px 0}
.num{background:#1d2a4a;border:1px solid var(--border);border-radius:50%;width:26px;height:26px;
  display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0;font-size:.85rem}

/* ---------- Hero на главной ---------- */
.hero{padding:34px 0 8px}
.eyebrow{color:var(--accent);font-weight:700;letter-spacing:.08em;font-size:.82rem;text-transform:uppercase}

/* ---------- Карточки моделей ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,258px),1fr));gap:18px;margin-top:8px}
.card{
  display:block;text-decoration:none;color:inherit;background:var(--panel);
  border:1px solid var(--border);border-radius:16px;padding:22px;transition:.18s;
}
.card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:var(--shadow)}
.card .emoji{font-size:2.4rem;line-height:1}
.card .n{color:var(--accent);font-size:.8rem;font-weight:800;letter-spacing:.06em;margin-top:10px}
.card .q{font-size:1.16rem;font-weight:700;margin:6px 0 6px}
.card .d{color:var(--muted);font-size:.92rem}

/* ---------- Блок перелинковки «похожие» ---------- */
.related{margin-top:26px}
.related h2{margin-bottom:12px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,220px),1fr));gap:12px}
.related-grid a{
  display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);
  background:var(--panel-2);border:1px solid var(--border);border-radius:12px;padding:12px 14px;
  font-weight:600;font-size:.95rem;transition:.15s;
}
.related-grid a:hover{border-color:var(--accent);background:#16203a}
.related-grid .e{font-size:1.5rem;line-height:1}

/* ---------- Подвал ---------- */
.site-footer{border-top:1px solid var(--border-soft);margin-top:40px}
.site-footer .inner{max-width:var(--maxw);margin:0 auto;padding:26px 16px 40px;color:var(--muted);font-size:.9rem}
.site-footer nav{display:flex;flex-wrap:wrap;gap:10px 18px;margin-bottom:14px}
.site-footer nav a{color:var(--muted);text-decoration:none}
.site-footer nav a:hover{color:var(--text)}
.site-footer .fine{font-size:.82rem;opacity:.85}

/* ---------- Мобильный адаптив ---------- */
@media (max-width:720px){
  .nav-toggle{display:block}
  .site-header .bar{flex-wrap:wrap}
  .site-nav{
    order:3;flex-basis:100%;flex-direction:column;align-items:stretch;
    gap:2px;margin-left:0;display:none;padding-top:8px;
  }
  .site-nav a{text-align:left}
  .site-nav.open{display:flex}
  .site-nav a{padding:11px 12px;border-radius:10px}
  .controls{gap:12px}
  .ctrl,.meter{flex-basis:100%;min-width:0}
  .panel{padding:14px}
  .wrap{padding:16px 14px 52px}
}
@media (max-width:420px){
  .stat{width:calc(50% - 7px)}
  button{flex:1 1 auto}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important}
}