/* =========================================================
   3D — памятка «Как читать наш 3D-замер»
   Минималистичная светлая тема: белые дуги, точечная сетка,
   полупрозрачные панели, моно-подписи, тонкие контуры.
   ========================================================= */

:root{
  --bg:#f3f3f0; --paper:rgba(255,255,255,.82); --paper-solid:#fbfbf9;
  --ink:#121212; --ink-2:#3a3a37; --muted:#6b6b66;
  --line:rgba(18,18,18,.08); --line-2:rgba(18,18,18,.05); --soft:rgba(18,18,18,.035);
  --red:#d71921; --red-glow:rgba(215,25,33,.14);
  --c-black:#111111; --c-green:#14a03c; --c-orange:#ff8c00; --c-blue:#1d4ed8; --c-red:#e0201b; --c-pink:#ff4fb4;

  --display:"Unbounded", "Manrope", "Segoe UI", system-ui, sans-serif;
  --sans:"Manrope", "Inter", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  --mono:"JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;

  --r:22px; --r-s:14px;
  --sh-1:0 1px 1px rgba(0,0,0,.025), 0 6px 20px rgba(0,0,0,.035);
  --sh-2:0 1px 1px rgba(0,0,0,.03), 0 18px 48px rgba(0,0,0,.075);
  --ease:cubic-bezier(.2,.7,.2,1);
  --nav-h:64px;
}

/* ---------- база ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 16px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
::selection{background:var(--ink);color:#fff}
a{color:inherit}
img,svg{max-width:100%}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:10px}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}
p{margin:0 0 12px}
.muted{color:var(--muted)}
.mono{font-family:var(--mono);font-size:.92em}

/* ---------- фон: дуги на весь экран + сетка точек ---------- */
.bg{position:fixed;left:0;top:0;width:100%;height:100vh;height:100lvh;z-index:-2;pointer-events:none;contain:strict;transform:translateZ(0)}
.bg svg{width:100%;height:100%;display:block}
.bg .ly{transform-box:fill-box;transform-origin:left center}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(circle,rgba(18,18,18,.06) .9px,transparent 1.2px) 0 0/16px 16px;
  -webkit-mask:linear-gradient(180deg,#000 0,rgba(0,0,0,.35) 60%,#000 100%);mask:linear-gradient(180deg,#000 0,rgba(0,0,0,.35) 60%,#000 100%)}

/* ---------- типографика ---------- */
.cap{font:500 11px/1 var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--muted);display:inline-flex;align-items:center;gap:9px}
.cap::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--red);box-shadow:0 0 0 4px var(--red-glow)}
h1,h2,h3{margin:0;color:var(--ink)}
h1,h2{font-family:var(--display);font-weight:500;letter-spacing:-.035em;line-height:1.06}
h1{font-size:clamp(34px,5.4vw,66px);margin-top:18px}
h2{font-size:clamp(26px,3.3vw,40px);margin:14px 0 20px}
h3{font:700 18px/1.3 var(--sans);letter-spacing:-.01em;margin-bottom:6px}
h1 .nw{white-space:nowrap}
h1 .hl{background:linear-gradient(transparent 70%,rgba(215,25,33,.16) 70%,rgba(215,25,33,.16) 90%,transparent 90%);padding:0 .04em;border-radius:4px}
.sub{max-width:720px}

/* ---------- верхняя панель ---------- */
nav.top{position:sticky;top:0;z-index:20;height:var(--nav-h);
  background:color-mix(in srgb,#f6f6f3 70%,transparent);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);
  border-bottom:1px solid var(--line-2);transition:box-shadow .3s var(--ease),background .3s}
nav.top.scrolled{box-shadow:0 8px 30px rgba(0,0,0,.05);background:color-mix(in srgb,#f8f8f6 82%,transparent)}
nav.top .wrap{display:flex;align-items:center;gap:22px;height:100%}

.logo{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font:600 17px/1 var(--display);letter-spacing:-.03em}
.logo .mark{width:40px;height:40px;border-radius:50%;display:block;background:#f3f2ec;box-shadow:0 0 0 1px rgba(18,18,18,.06),0 4px 12px rgba(0,0,0,.08)}
.logo i{width:28px;height:28px;border-radius:9px;background:var(--ink);position:relative;display:block;box-shadow:inset 0 0 0 1px rgba(255,255,255,.08),0 4px 10px rgba(0,0,0,.12)}
.logo i::after{content:"";position:absolute;right:5px;top:5px;width:7px;height:7px;border-radius:50%;background:var(--red);box-shadow:0 0 8px rgba(215,25,33,.8)}

/* правая панель ссылок: почти прозрачные контуры + подсветка */
.links{position:relative;display:flex;gap:4px;margin-left:auto;padding:4px;border-radius:999px;
  background:rgba(255,255,255,.42);border:1px solid rgba(18,18,18,.06);box-shadow:inset 0 1px 0 rgba(255,255,255,.7)}
.links a{position:relative;z-index:1;display:inline-flex;align-items:center;gap:7px;height:34px;padding:0 14px;border-radius:999px;
  font:500 13.5px/1 var(--sans);text-decoration:none;color:var(--muted);white-space:nowrap;
  border:1px solid rgba(18,18,18,.035);transition:color .2s,border-color .2s,background .2s,box-shadow .25s var(--ease)}
.links a::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor;opacity:0;transform:scale(.4);transition:all .25s var(--ease)}
.links a:hover{color:var(--ink);border-color:rgba(18,18,18,.1);background:rgba(255,255,255,.7);box-shadow:0 0 0 4px rgba(255,255,255,.45),0 6px 18px rgba(0,0,0,.06)}
.links a.on{color:var(--ink);border-color:rgba(18,18,18,.08)}
.links a.on::before{opacity:1;transform:none;background:var(--red);box-shadow:0 0 8px rgba(215,25,33,.7)}
.glider{position:absolute;z-index:0;top:4px;height:34px;left:0;width:0;border-radius:999px;background:#fff;opacity:0;
  box-shadow:0 0 0 1px rgba(18,18,18,.05),0 4px 14px rgba(0,0,0,.07),0 0 22px rgba(215,25,33,.10);
  transition:transform .45s var(--ease),width .45s var(--ease),opacity .3s}
.links.has-on .glider{opacity:1}

.burger{display:none;margin-left:auto;width:42px;height:42px;border-radius:50%;border:1px solid rgba(18,18,18,.08);background:rgba(255,255,255,.6);cursor:pointer;position:relative}
.burger span{position:absolute;left:13px;right:13px;height:1.6px;background:var(--ink);border-radius:2px;transition:transform .3s var(--ease),top .3s var(--ease)}
.burger span:first-child{top:16px}.burger span:last-child{top:24px}
.burger[aria-expanded="true"] span:first-child{top:20px;transform:rotate(45deg)}
.burger[aria-expanded="true"] span:last-child{top:20px;transform:rotate(-45deg)}

.progress{position:absolute;left:0;bottom:-1px;height:2px;width:100%;transform-origin:left;transform:scaleX(var(--p,0));
  background:linear-gradient(90deg,var(--ink),var(--red));opacity:.85}

@media (max-width:900px){
  .burger{display:block}
  .links{position:absolute;top:calc(var(--nav-h) - 6px);right:16px;left:16px;margin:0;flex-direction:column;gap:2px;padding:8px;border-radius:20px;
    background:#fafaf8;border-color:rgba(18,18,18,.08);box-shadow:var(--sh-2);
    opacity:0;transform:translateY(-8px) scale(.98);pointer-events:none;transition:opacity .25s,transform .3s var(--ease)}
  .links.open{opacity:1;transform:none;pointer-events:auto}
  .links a{height:44px;font-size:15px}
  .glider{display:none}
  .links a.on{background:#fff}
}

/* ---------- кнопки-пилюли ---------- */
.pills{display:flex;gap:10px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;gap:8px;height:46px;padding:0 22px;border-radius:999px;border:1px solid var(--line);
  background:rgba(255,255,255,.7);text-decoration:none;font-weight:600;font-size:15px;
  transition:transform .2s var(--ease),box-shadow .25s var(--ease),background .2s}
.pill:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(0,0,0,.08);background:#fff}
.pill.dark{background:var(--ink);color:#fff;border-color:var(--ink)}
.pill.dark:hover{background:#000;box-shadow:0 10px 26px rgba(0,0,0,.22)}
.pill.dark span{transition:transform .25s var(--ease)}
.pill.dark:hover span{transform:translateX(3px)}

/* ---------- hero ---------- */
.hero{padding:80px 24px 64px;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero p.lead{font-size:clamp(17px,1.6vw,19.5px);color:var(--ink-2);max-width:540px;margin:22px 0 30px}
.hero-card{margin:0;background:rgba(255,255,255,.8);
  border:1px solid rgba(255,255,255,.9);outline:1px solid var(--line-2);border-radius:30px;padding:16px;box-shadow:var(--sh-2)}
.hero-card svg{width:100%;height:auto;display:block;border-radius:18px}
.hc-head{display:flex;justify-content:space-between;align-items:center;margin:4px 6px 12px}
.hint{font:500 11px var(--mono);color:var(--muted);letter-spacing:.06em}
.hero-card [data-c]{transition:opacity .3s var(--ease),filter .3s}
.hero-card.hl svg [data-c]{opacity:.12}
.hero-card.hl svg [data-c].lit{opacity:1;filter:drop-shadow(0 0 4px rgba(0,0,0,.18))}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:12px 2px 2px}
.chips button{display:inline-flex;align-items:center;gap:7px;height:30px;padding:0 12px;border-radius:999px;cursor:pointer;
  border:1px solid rgba(18,18,18,.06);background:rgba(255,255,255,.6);font:500 12.5px var(--sans);color:var(--ink-2);
  transition:all .2s var(--ease)}
.chips button i{width:9px;height:9px;border-radius:50%;display:block}
.chips button:hover,.chips button.on{background:#fff;border-color:rgba(18,18,18,.12);color:var(--ink);box-shadow:0 4px 12px rgba(0,0,0,.06)}
@media (max-width:900px){.hero{grid-template-columns:1fr;padding-top:44px;gap:36px}}

/* ---------- секции и сетки ---------- */
section{padding:72px 0;position:relative}
section::before{content:"";position:absolute;top:0;left:50%;width:min(1092px,calc(100% - 48px));transform:translateX(-50%);height:1px;
  background:linear-gradient(90deg,transparent,rgba(18,18,18,.1) 20%,rgba(18,18,18,.1) 80%,transparent)}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))} .g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.stack{gap:12px}
.top-align{align-items:start}
@media (max-width:900px){.g3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:640px){.g2,.g3{grid-template-columns:1fr} section{padding:56px 0}}

.card{position:relative;background:var(--paper);
  border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--sh-1);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s}
.card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:rgba(18,18,18,.12)}
.card p:last-child{margin-bottom:0}
.card.center{display:grid;place-items:center}
.card .num{font:500 11.5px var(--mono);color:var(--muted);letter-spacing:.12em;margin-bottom:10px}
.zz{width:100%;height:auto}

/* ---------- легенда ---------- */
.legend{margin-top:24px}
.legend .card{display:grid;grid-template-columns:56px 1fr;gap:16px;align-items:start;cursor:default}
.legend .card::after{content:"";position:absolute;inset:-1px;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .3s;
  box-shadow:0 0 0 1px color-mix(in srgb,var(--cc) 40%,transparent),0 0 28px color-mix(in srgb,var(--cc) 18%,transparent)}
.legend .card:hover::after{opacity:1}
.legend [data-c="black"]{--cc:#111}.legend [data-c="blue"]{--cc:#1d4ed8}.legend [data-c="green"]{--cc:#14a03c}
.legend [data-c="orange"]{--cc:#ff8c00}.legend [data-c="red"]{--cc:#e0201b}.legend [data-c="pink"]{--cc:#ff4fb4}
.sw{width:56px;height:56px;border-radius:16px;display:grid;place-items:center;box-shadow:inset 0 0 0 1px rgba(255,255,255,.15),0 6px 16px color-mix(in srgb,var(--cc) 30%,transparent)}
.sw svg{width:40px;height:40px}
.legend h3{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.legend h3 small{font:500 10.5px var(--mono);letter-spacing:.12em;color:var(--muted);text-transform:uppercase}
.legend p{font-size:15px;color:var(--ink-2);margin:0}

/* ---------- таблица ---------- */
.tw{margin-top:22px;overflow-x:auto;border-radius:var(--r);box-shadow:var(--sh-1)}
.table{width:100%;min-width:520px;border-collapse:separate;border-spacing:0;background:var(--paper);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;font-size:15px}
.table th,.table td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line-2);vertical-align:top}
.table th{font:500 10.5px var(--mono);letter-spacing:.16em;text-transform:uppercase;color:var(--muted);background:var(--soft)}
.table tr:last-child td{border-bottom:0}
.table tr{transition:background .2s}
.table tr:hover td{background:rgba(255,255,255,.6)}
.dot{display:inline-block;width:11px;height:11px;border-radius:50%;vertical-align:-1px;margin-right:9px;box-shadow:0 0 0 3px rgba(18,18,18,.04)}

/* ---------- шаги ---------- */
.steps{counter-reset:s;display:grid;gap:12px}
.step{display:grid;grid-template-columns:48px 1fr;gap:16px;background:var(--paper);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--sh-1);transition:transform .3s var(--ease),box-shadow .3s}
.step:hover{transform:translateX(3px);box-shadow:var(--sh-2)}
.step::before{counter-increment:s;content:counter(s,decimal-leading-zero);width:40px;height:40px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font:500 13px var(--mono);box-shadow:0 6px 14px rgba(0,0,0,.18)}
.step p{margin:0;color:var(--ink-2)}

.check ol{margin:10px 0 0;padding:0;list-style:none;counter-reset:c;display:grid;gap:12px}
.check li{counter-increment:c;display:grid;grid-template-columns:28px 1fr;gap:10px;color:var(--ink-2)}
.check li::before{content:counter(c);width:26px;height:26px;border-radius:50%;border:1px solid rgba(18,18,18,.14);display:grid;place-items:center;font:500 12px var(--mono);color:var(--ink);background:#fff}

/* ---------- форматы ---------- */
.fmt{display:flex;flex-direction:column;gap:6px}
.fmt b{font:500 21px var(--mono);letter-spacing:-.02em}
.fmt .for{display:inline-flex;align-self:flex-start;font:500 10.5px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);
  border:1px solid var(--line);border-radius:999px;padding:5px 10px;margin:2px 0 6px;background:rgba(255,255,255,.5)}
.foot{margin-top:18px}

/* ---------- примечание ---------- */
.ok{display:flex;gap:14px;align-items:flex-start;margin-top:16px;border-radius:var(--r);padding:18px 22px;background:rgba(255,255,255,.55);border:1px dashed rgba(18,18,18,.18);color:var(--ink-2)}
.ok-i{flex:none;width:24px;height:24px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font:600 12px var(--mono);margin-top:1px}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:10px}
details{background:var(--paper);border:1px solid var(--line);border-radius:18px;box-shadow:var(--sh-1);transition:box-shadow .3s,border-color .3s}
details:hover{border-color:rgba(18,18,18,.12)}
details[open]{box-shadow:var(--sh-2)}
summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:18px 22px}
summary::-webkit-details-marker{display:none}
summary::after{content:"";flex:none;width:28px;height:28px;border-radius:50%;border:1px solid rgba(18,18,18,.1);
  background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 6v12M6 12h12' stroke='%23121212' stroke-width='1.8' stroke-linecap='round'/%3E%3C/svg%3E") center/14px no-repeat;
  transition:transform .35s var(--ease)}
details[open] summary::after{transform:rotate(45deg)}
.ans{overflow:hidden;padding:0 22px}
.ans p{margin:0 0 18px;color:var(--ink-2)}

/* ---------- подвал ---------- */
footer{padding:44px 0 64px;position:relative;font-size:14px}
footer::before{content:"";position:absolute;top:0;left:50%;width:min(1092px,calc(100% - 48px));transform:translateX(-50%);height:1px;background:linear-gradient(90deg,transparent,rgba(18,18,18,.1) 20%,rgba(18,18,18,.1) 80%,transparent)}
footer .wrap{display:flex;gap:16px;flex-wrap:wrap;justify-content:space-between;align-items:center}

/* ---------- кнопка наверх ---------- */
.totop{position:fixed;right:20px;bottom:20px;z-index:15;width:46px;height:46px;border-radius:50%;display:grid;place-items:center;text-decoration:none;
  background:rgba(255,255,255,.92);border:1px solid rgba(18,18,18,.08);box-shadow:var(--sh-2);
  opacity:0;transform:translateY(10px);pointer-events:none;transition:opacity .3s,transform .3s var(--ease)}
.totop.show{opacity:1;transform:none;pointer-events:auto}
.totop:hover{background:#fff}

/* ---------- появление при прокрутке (только с JS) ---------- */
.js .rv{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease);transition-delay:var(--d,0s)}
.js .rv.in{opacity:1;transform:none}
.js .zz .draw{stroke-dasharray:1400;stroke-dashoffset:1400;transition:stroke-dashoffset 1.8s var(--ease) .2s}
.js .zz.drawn .draw{stroke-dashoffset:0}

/* ---------- мини-бегунок справа ---------- */
.mini{position:fixed;right:4px;top:calc(var(--nav-h) + 14px);bottom:84px;width:30px;z-index:16;touch-action:none;cursor:pointer;
  opacity:.55;transition:opacity .25s}
.mini:hover,.mini.active,.mini.drag{opacity:1}
.mini-track{position:absolute;top:0;bottom:0;right:13px;width:3px;border-radius:3px;background:rgba(18,18,18,.08)}
.mini-thumb{position:absolute;left:-2px;top:0;width:7px;min-height:24px;border-radius:7px;background:var(--ink);
  box-shadow:0 0 0 3px rgba(255,255,255,.85),0 2px 8px rgba(0,0,0,.2);will-change:transform}
.mini.drag .mini-thumb{background:var(--red);box-shadow:0 0 0 3px rgba(255,255,255,.9),0 0 12px rgba(215,25,33,.5)}
.mini-tick{position:absolute;left:-3px;width:9px;height:9px;margin-top:-4.5px;border-radius:50%;background:#fff;border:1.5px solid rgba(18,18,18,.25);padding:0;cursor:pointer}
.mini-tick.on{border-color:var(--red);background:var(--red)}
.mini-tick::after{content:"";position:absolute;inset:-9px -10px}
.mini-label{position:absolute;right:30px;top:0;white-space:nowrap;padding:6px 11px;border-radius:999px;background:var(--ink);color:#fff;
  font:500 11px/1 var(--mono);letter-spacing:.06em;opacity:0;transform:translateX(6px);transition:opacity .2s,transform .2s;pointer-events:none}
.mini.active .mini-label,.mini.drag .mini-label{opacity:1;transform:none}
.totop{right:44px}

/* ---------- телефон: быстрее и легче ---------- */
@media (max-width:900px),(pointer:coarse){
  nav.top,nav.top.scrolled{background:rgba(246,246,243,.96);backdrop-filter:none;-webkit-backdrop-filter:none}
  body::before{-webkit-mask:none;mask:none;opacity:.7}
  .card:hover,.step:hover{transform:none;box-shadow:var(--sh-1)}
  .js .rv{transform:translateY(8px);transition-duration:.4s}
  .js .zz .draw{transition-duration:1s}
  .mini{opacity:.8;width:22px;right:2px}
  .mini-track{right:9px}
  .mini-label{right:24px}
  .totop{right:34px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .js .rv{opacity:1;transform:none}
  .js .zz .draw{stroke-dashoffset:0}
}
@media print{
  .bg,nav.top,.totop,.chips,.hint,.mini{display:none}
  .js .rv{opacity:1;transform:none}
  .card,details,.step{box-shadow:none;backdrop-filter:none}
}

.dist{margin-top:16px}
.zz2{width:100%;height:auto}