/* Общая оболочка демо-страниц — в стиле tsemeneev.ru */
:root{
  --bg:#0b0b12;--bg-2:#11111b;--card:rgba(255,255,255,.035);--card-2:rgba(255,255,255,.06);
  --line:rgba(255,255,255,.08);--line-2:rgba(255,255,255,.14);
  --text:#ecebf5;--muted:#a3a3b8;--dim:#6f6f86;
  --a1:#7c5cff;--a2:#3fb6ff;--a3:#22e1b6;--danger:#ff6b6b;--warn:#ffb347;
  --grad:linear-gradient(120deg,var(--a1) 0%,var(--a2) 55%,var(--a3) 100%);
  --radius:20px;--radius-sm:12px;
  --font:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --font-h:'Manrope','Inter',system-ui,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  --nav-h:64px;
}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px)}
body{margin:0;background:var(--bg);color:var(--text);font:400 15.5px/1.6 var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-family:var(--font-h);line-height:1.15;margin:0;letter-spacing:-.02em}
p{margin:0}
button,input,select,textarea{font:inherit;color:inherit}
::selection{background:rgba(124,92,255,.45)}
:focus-visible{outline:2px solid var(--a2);outline-offset:2px;border-radius:6px}
.container{width:100%;max-width:1280px;margin:0 auto;padding:0 20px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.mono{font-family:var(--mono)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* фон */
.bg{position:fixed;inset:0;z-index:-1;pointer-events:none;overflow:hidden}
.bg i{position:absolute;border-radius:50%;filter:blur(90px);opacity:.45}
.bg i:nth-child(1){width:620px;height:620px;background:radial-gradient(circle,rgba(124,92,255,.55),transparent 65%);top:-240px;left:-180px}
.bg i:nth-child(2){width:560px;height:560px;background:radial-gradient(circle,rgba(34,225,182,.28),transparent 65%);top:35%;right:-260px}
.bg b{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.026) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.026) 1px,transparent 1px);background-size:56px 56px;-webkit-mask-image:radial-gradient(ellipse 80% 55% at 50% 0%,#000 30%,transparent 75%);mask-image:radial-gradient(ellipse 80% 55% at 50% 0%,#000 30%,transparent 75%)}

/* шапка */
.nav{position:sticky;top:0;z-index:40;height:var(--nav-h);background:rgba(11,11,18,.72);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border-bottom:1px solid var(--line)}
.nav__in{height:100%;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font:700 17px/1 var(--font-h)}
.logo__mark{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:var(--grad);color:#0b0b12;font:800 13px/1 var(--font-h)}
.logo__text span{color:var(--dim)}
.nav__crumb{color:var(--muted);font-size:14px;display:flex;align-items:center;gap:8px}
.nav__crumb b{color:var(--text);font-weight:600}
.nav__right{display:flex;align-items:center;gap:10px}
.pill{display:inline-flex;align-items:center;gap:7px;height:28px;padding:0 11px;border-radius:99px;border:1px solid var(--line-2);font:600 12px/1 var(--font);color:var(--muted);letter-spacing:.02em;white-space:nowrap}
.pill i{width:7px;height:7px;border-radius:50%;background:var(--a3);box-shadow:0 0 0 0 rgba(34,225,182,.6);animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 7px rgba(34,225,182,0)}100%{box-shadow:0 0 0 0 rgba(34,225,182,0)}}

/* кнопки */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;height:46px;padding:0 20px;border-radius:13px;font:600 15px/1 var(--font);border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .25s,background .25s,border-color .25s,opacity .2s;white-space:nowrap;background:none}
.btn svg{width:18px;height:18px;flex:none}
.btn--primary{background:var(--grad);color:#0b0b12;box-shadow:0 8px 28px -10px rgba(124,92,255,.7)}
.btn--primary:hover{transform:translateY(-1px);box-shadow:0 14px 36px -12px rgba(63,182,255,.8)}
.btn--ghost{background:rgba(255,255,255,.04);border-color:var(--line-2)}
.btn--ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.24)}
.btn--sm{height:36px;padding:0 14px;font-size:14px;border-radius:10px}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none!important}

/* герой */
.hero{padding-top:44px;padding-bottom:26px}
.kicker{display:inline-flex;align-items:center;gap:8px;font:600 12px/1 var(--font);letter-spacing:.14em;text-transform:uppercase;color:var(--a2);margin-bottom:16px}
.hero h1{font-size:clamp(28px,4.4vw,48px);font-weight:800;max-width:900px}
.hero__lead{margin-top:16px;font-size:clamp(15.5px,1.6vw,18px);color:var(--muted);max-width:760px}
.demo-note{margin-top:20px;display:flex;gap:12px;align-items:flex-start;max-width:760px;padding:13px 16px;border-radius:14px;border:1px dashed var(--line-2);background:rgba(255,255,255,.02);font-size:14px;color:var(--muted)}
.demo-note svg{width:18px;height:18px;flex:none;margin-top:2px;stroke:var(--a2)}
.demo-note a{color:var(--text);border-bottom:1px solid var(--line-2)}

/* карточки и формы */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field>span{font-size:12.5px;color:var(--muted);font-weight:500}
.input,select.input,textarea.input{width:100%;height:42px;padding:0 12px;border-radius:11px;border:1px solid var(--line-2);background:rgba(255,255,255,.03);outline:none;transition:border-color .2s,background .2s,box-shadow .2s;font-size:14.5px}
textarea.input{height:auto;min-height:84px;padding:10px 12px;resize:vertical;line-height:1.5}
select.input{appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5' stroke='%23a3a3b8' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:34px}
select.input option{background:#151520;color:var(--text)}
.input:hover{border-color:rgba(255,255,255,.22)}
.input:focus{border-color:var(--a2);background:rgba(63,182,255,.05);box-shadow:0 0 0 3px rgba(63,182,255,.14)}
.input.is-bad{border-color:var(--danger);box-shadow:0 0 0 3px rgba(255,107,107,.15)}
input[type=date].input{color-scheme:dark}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font:500 12.5px/1 var(--mono);padding:7px 10px;border-radius:8px;background:rgba(255,255,255,.05);border:1px solid var(--line);color:var(--muted)}

/* секции «как устроено» */
.section{padding-top:56px;padding-bottom:56px}
.section h2{font-size:clamp(24px,3vw,34px);font-weight:800;margin-bottom:10px}
.section__lead{color:var(--muted);max-width:720px;margin-bottom:26px}
.how{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.how .card{padding:22px}
.how h3{font-size:17px;margin:14px 0 8px}
.how p{font-size:14.5px;color:var(--muted)}
.how__ic{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:rgba(124,92,255,.14);border:1px solid rgba(124,92,255,.35)}
.how__ic svg{width:20px;height:20px;stroke:#cbbcff;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.cta{margin-top:30px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:26px 28px;border-radius:var(--radius);background:linear-gradient(120deg,rgba(124,92,255,.16),rgba(63,182,255,.1) 55%,rgba(34,225,182,.12));border:1px solid var(--line-2)}
.cta h3{font-size:21px;margin-bottom:6px}
.cta p{color:var(--muted);font-size:15px}
.cta__btns{display:flex;gap:10px;flex-wrap:wrap}

/* подвал */
.foot{border-top:1px solid var(--line);padding:26px 0 34px;color:var(--dim);font-size:13.5px}
.foot__in{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
.foot a{color:var(--muted)}.foot a:hover{color:var(--text)}

/* тост */
.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(20px);opacity:0;z-index:80;background:#1a1a29;border:1px solid var(--line-2);padding:11px 16px;border-radius:12px;font-size:14px;box-shadow:0 18px 50px -12px rgba(0,0,0,.7);transition:opacity .25s,transform .25s;pointer-events:none;max-width:calc(100vw - 32px)}
.toast.is-on{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.is-err{border-color:rgba(255,107,107,.5)}

@media (max-width:1000px){.how{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){
  :root{--nav-h:58px}
  .nav__crumb,.nav__right .pill{display:none}
  .hero{padding-top:28px;padding-bottom:18px}
  .how{grid-template-columns:1fr}
  .cta{flex-direction:column;align-items:flex-start;padding:22px}
  .section{padding-top:40px;padding-bottom:40px}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}