:root{
  --bg:#f4f6fb;--bg2:#eaeffa;--card:#fff;--ink:#14213d;--mut:#667085;--line:#e3e8f2;
  --acc:#3b6cf6;--acc2:#6a4cf5;--accsoft:#eaf0ff;--ok:#12a150;--err:#d92d20;--warn:#f79009;
  --shadow:0 1px 2px rgba(20,33,61,.06),0 8px 24px -12px rgba(20,33,61,.18);
  --grad:linear-gradient(135deg,#3b6cf6 0%,#6a4cf5 100%);--r:18px
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0c1220;--bg2:#111a2e;--card:#151f35;--ink:#e9eefb;--mut:#92a0ba;--line:#243049;
  --acc:#6b93ff;--acc2:#8b73ff;--accsoft:#1c2a4a;--shadow:0 1px 2px rgba(0,0,0,.4),0 10px 28px -12px rgba(0,0,0,.6);
  --grad:linear-gradient(135deg,#4d78f7 0%,#7a5cf6 100%)}}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;margin:0;overflow:hidden}
body{height:var(--vh,100dvh);display:flex;flex-direction:column;background:radial-gradient(1200px 500px at 50% -10%,var(--bg2),var(--bg));color:var(--ink);
  font:16px/1.45 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased}
header{display:flex;align-items:center;gap:12px;padding:12px 16px;background:color-mix(in srgb,var(--card) 82%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);position:relative;z-index:5}
header .logo{flex:none;width:38px;height:38px;border-radius:12px;background:var(--grad);color:#fff;display:grid;place-items:center;font-weight:800;font-size:15px;letter-spacing:-.5px;box-shadow:0 6px 16px -6px var(--acc)}
header .ttl{display:flex;flex-direction:column;line-height:1.15;min-width:0}
header .ttl b{font-size:16px;letter-spacing:-.2px}header .ttl small{color:var(--mut);font-size:12px;margin-top:2px}
.net{margin-left:auto;font-size:12px;font-weight:600;padding:6px 10px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--mut);box-shadow:none;white-space:nowrap}
.net[hidden]{display:none}
.net.off{color:#b54708;border-color:#f79009;background:color-mix(in srgb,#f79009 14%,var(--card))}
.net.sync{color:var(--acc);border-color:var(--acc)}
.net.warn{color:#fff;background:var(--err);border-color:var(--err)}
.net+.adm{margin-left:0}
.adm{margin-left:auto;flex:none;font-size:13px;font-weight:600;color:var(--acc);text-decoration:none;padding:7px 14px;border:1px solid var(--line);border-radius:999px;background:var(--card);transition:.2s}
.adm:hover{border-color:var(--acc);transform:translateY(-1px)}
main{flex:1;overflow-y:auto;padding:16px 14px 6px;display:flex;flex-direction:column;gap:10px;max-width:760px;width:100%;margin:0 auto;scroll-behavior:smooth}
@keyframes pop{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:none}}
.b{max-width:86%;padding:10px 14px;border-radius:20px;white-space:pre-wrap;word-break:break-word;animation:pop .25s ease both;box-shadow:var(--shadow)}
.bot{background:var(--card);border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:6px}
.me{background:var(--grad);color:#fff;align-self:flex-end;border-bottom-right-radius:6px;box-shadow:0 8px 20px -10px var(--acc)}
.err{color:var(--err)}
footer{background:color-mix(in srgb,var(--card) 90%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line);
  padding:12px 14px calc(12px + env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:10px;max-height:55vh;overflow-y:auto;box-shadow:0 -10px 30px -20px rgba(20,33,61,.3)}
footer>*{max-width:760px;width:100%;margin:0 auto}
footer:empty{display:none}
.row{display:flex;gap:8px;flex-wrap:wrap}
input[type=text],input[type=password],input[type=number],input[type=date],input:not([type]),textarea,select{flex:1;min-width:0;font:inherit;padding:12px 14px;border:1.5px solid var(--line);border-radius:14px;background:var(--bg);color:var(--ink);transition:border-color .15s,box-shadow .15s}
input:focus,textarea:focus,select:focus{outline:0;border-color:var(--acc);box-shadow:0 0 0 4px color-mix(in srgb,var(--acc) 18%,transparent)}
textarea{min-height:84px;resize:vertical}
button{font:inherit;font-weight:600;padding:12px 18px;border:0;border-radius:14px;background:var(--grad);color:#fff;cursor:pointer;transition:transform .12s,box-shadow .2s,opacity .2s;box-shadow:0 8px 18px -10px var(--acc)}
button:active{transform:scale(.97)}
button:hover{box-shadow:0 10px 22px -10px var(--acc)}
button.sec{background:var(--accsoft);color:var(--acc);box-shadow:none}
button.chip{background:var(--accsoft);color:var(--acc);padding:8px 14px;border-radius:999px;font-size:14px;font-weight:500;box-shadow:none;white-space:normal;text-align:left}
button.link{background:none;color:var(--mut);padding:6px 8px;font-size:14px;font-weight:500;box-shadow:none}
button.big{flex:1;min-width:42%;padding:15px 16px;background:var(--card);color:var(--ink);border:1.5px solid var(--line);box-shadow:var(--shadow)}
button.big:first-child{background:var(--grad);color:#fff;border-color:transparent}
button.big:hover{border-color:var(--acc)}
button:disabled{opacity:.45;pointer-events:none}
.thumbs{display:flex;gap:8px;flex-wrap:wrap}
.thumb{position:relative;width:60px;height:60px;border-radius:12px;overflow:hidden;background:var(--bg);border:1px solid var(--line);animation:pop .25s ease both}
.thumb img{width:100%;height:100%;object-fit:cover}
.thumb i{position:absolute;right:3px;bottom:3px;font-style:normal;font-size:12px;background:var(--ok);color:#fff;border-radius:8px;padding:0 5px}
.thumb.bad i{background:var(--err)}
.hint{font-size:13px;color:var(--mut)}
a.btn{display:block;text-align:center;padding:13px 18px;border-radius:14px;background:var(--grad);color:#fff;text-decoration:none;font-weight:600;box-shadow:0 8px 18px -10px var(--acc)}

/* визуальная форма */
.prevbox{display:flex;flex-direction:column;gap:8px;background:var(--accsoft);border-radius:14px;padding:12px 14px;margin:10px 0}
.prevbox button{align-self:flex-start}
input.pre,textarea.pre{background:color-mix(in srgb,var(--warn) 12%,var(--bg))}
body:not(.formmode) section.form{display:none}
.formmode main,.formmode footer{display:none}
section.form{flex:1;overflow-y:auto;padding:0 14px 40px;max-width:760px;width:100%;margin:0 auto;scroll-behavior:smooth}
.fprog{position:sticky;top:0;z-index:4;margin:0 -14px;padding:10px 14px;background:color-mix(in srgb,var(--bg) 97%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);display:flex;align-items:center;gap:10px;font-size:13px;color:var(--mut);font-weight:600}
.fprog .bar{flex:1;height:8px;background:var(--line);border-radius:99px;overflow:hidden}
.fprog .bar i{display:block;height:100%;width:0;background:var(--grad);border-radius:99px;transition:width .35s ease}
section.form h2{margin:.6em 0 .1em;font-size:24px;letter-spacing:-.5px}
section.form h3{margin:26px 0 10px;font-size:15px;text-transform:uppercase;letter-spacing:.06em;color:var(--mut);display:flex;align-items:center;gap:8px}
section.form h3 .ic{font-size:20px;filter:none}
section.form h4{margin:0 0 10px;font-size:16px}
.fhead p{margin:4px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;margin-bottom:12px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.card[data-key]::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--grad)}
.card[data-key$=":technical"]::before{background:var(--line)}
.card.warn{border-color:var(--err);box-shadow:0 0 0 3px color-mix(in srgb,var(--err) 25%,transparent)}
.fld{margin-bottom:12px}.fld label{display:block;font-size:12.5px;font-weight:600;color:var(--mut);margin-bottom:5px}.fld input,.fld textarea{width:100%}
.seg{display:flex;gap:6px;background:var(--bg);padding:4px;border-radius:14px;border:1px solid var(--line)}
.segb{flex:1;background:transparent;color:var(--mut);box-shadow:none;padding:10px;border-radius:11px}
.segb.on{background:var(--grad);color:#fff;box-shadow:0 6px 14px -8px var(--acc)}
.pblock{margin-top:8px;padding:12px;border:1.5px dashed var(--line);border-radius:14px;background:var(--bg)}
.pblock label{display:block;font-size:12.5px;font-weight:600;color:var(--mut);margin-bottom:8px}.pblock .thumbs{margin:10px 0}
.rule{margin:12px 0;font-size:14px;background:var(--accsoft);border-radius:14px;padding:10px 14px}.rule summary{cursor:pointer;color:var(--acc);font-weight:600}
section.form .err{color:var(--err)}
button.send{width:100%;padding:16px;font-size:17px;margin-top:8px;border-radius:16px}
.dbody:not([hidden]){animation:pop .25s ease both}
.dbody[hidden]{display:none}
@media (min-width:760px){.fld.two{display:inline-block}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

.pinmask{position:fixed;inset:0;background:rgba(10,16,30,.55);backdrop-filter:blur(4px);display:grid;place-items:center;z-index:50;padding:16px}
.pinbox{background:var(--card);border-radius:20px;padding:20px;width:100%;max-width:340px;display:flex;flex-direction:column;gap:10px;box-shadow:var(--shadow)}

/* текущий вопрос */
.b.bot:not(.cur){filter:opacity(.72)}
.b.bot.cur{border-color:var(--acc);box-shadow:0 0 0 3px color-mix(in srgb,var(--acc) 18%,transparent),var(--shadow)}
.qbar{position:sticky;top:0;z-index:2;background:var(--accsoft);border-left:4px solid var(--acc);border-radius:12px;padding:7px 12px;font-size:14.5px;line-height:1.35;color:var(--ink)}
.qbar b{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--acc)}
.qbar span{display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3;overflow:hidden;white-space:pre-line}
.card.act{border-color:var(--acc);box-shadow:0 0 0 3px color-mix(in srgb,var(--acc) 20%,transparent),var(--shadow)}

/* ===== v3: фон, рамки, глубина ===== */
:root{
  --gb:linear-gradient(140deg,color-mix(in srgb,var(--acc) 55%,transparent),var(--line) 36%,var(--line) 64%,color-mix(in srgb,var(--acc2) 45%,transparent))
}
body{
  background:
    radial-gradient(900px 520px at 6% -6%,color-mix(in srgb,var(--acc) 24%,transparent),transparent 62%),
    radial-gradient(820px 560px at 102% 2%,color-mix(in srgb,var(--acc2) 20%,transparent),transparent 58%),
    radial-gradient(760px 620px at 48% 118%,color-mix(in srgb,#14b8a6 16%,transparent),transparent 62%),
    var(--bg);
  background-attachment:fixed
}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:radial-gradient(color-mix(in srgb,var(--ink) 11%,transparent) 1px,transparent 1.3px);background-size:22px 22px;
  -webkit-mask-image:linear-gradient(to bottom,#000 0,rgba(0,0,0,.55) 45%,transparent 92%);mask-image:linear-gradient(to bottom,#000 0,rgba(0,0,0,.55) 45%,transparent 92%)}
body::after{content:"";position:fixed;inset:0;z-index:40;pointer-events:none;
  box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--acc) 24%,transparent),inset 0 0 64px -34px var(--acc)}
main,section.form,footer{position:relative;z-index:1}
header::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none;
  background:linear-gradient(90deg,transparent,var(--acc),var(--acc2),transparent);opacity:.6}
footer{border-top:1px solid transparent;border-image:linear-gradient(90deg,transparent,color-mix(in srgb,var(--acc) 60%,transparent),transparent) 1}

/* карточки и пузыри: стеклянная заливка и градиентная кромка */
.card,.b.bot,.pinbox,.prevbox,.rule{border:1px solid transparent;
  background:linear-gradient(var(--card),var(--card)) padding-box,var(--gb) border-box}
.card{box-shadow:var(--shadow),inset 0 1px 0 rgba(255,255,255,.55)}
.card[data-key]::before{left:0;top:10px;bottom:10px;width:4px;border-radius:0 4px 4px 0}
.card.warn{background:linear-gradient(var(--card),var(--card)) padding-box,linear-gradient(var(--err),var(--err)) border-box}
.card.act{background:linear-gradient(var(--card),var(--card)) padding-box,linear-gradient(135deg,var(--acc),var(--acc2)) border-box}
.b.bot.cur{background:linear-gradient(var(--card),var(--card)) padding-box,linear-gradient(135deg,var(--acc),var(--acc2)) border-box}
.prevbox,.rule{background:linear-gradient(var(--accsoft),var(--accsoft)) padding-box,var(--gb) border-box}
.me{box-shadow:0 10px 24px -12px var(--acc),inset 0 1px 0 rgba(255,255,255,.28)}
button{background-image:linear-gradient(180deg,rgba(255,255,255,.18),rgba(255,255,255,0) 55%),var(--grad)}
button.sec,button.chip,button.link,button.segb,.net,.segb:not(.on){background-image:none}
input[type=text],input[type=password],input[type=number],input:not([type]),textarea{background:color-mix(in srgb,var(--card) 70%,var(--bg))}
.seg{background:color-mix(in srgb,var(--bg) 70%,var(--card));box-shadow:inset 0 1px 3px rgba(20,33,61,.08)}
.pblock{border-style:dashed;border-color:color-mix(in srgb,var(--acc) 35%,var(--line))}
.fprog{background:color-mix(in srgb,var(--bg) 82%,transparent)}
.fprog .bar{box-shadow:inset 0 1px 2px rgba(20,33,61,.12)}

/* на широком экране рабочая область — аккуратная панель по центру */
@media (min-width:900px){
  main,section.form{margin-top:16px;margin-bottom:0;border-radius:26px 26px 0 0;
    background:color-mix(in srgb,var(--card) 42%,transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
    border:1px solid transparent;border-bottom:0;
    box-shadow:0 40px 90px -50px rgba(20,33,61,.5);
    background:linear-gradient(color-mix(in srgb,var(--card) 42%,transparent),color-mix(in srgb,var(--card) 42%,transparent)) padding-box,var(--gb) border-box}
  section.form{padding-top:0;padding-left:22px;padding-right:22px}
  .fprog{margin:0 -22px;padding-left:22px;padding-right:22px}
  header{padding-left:max(16px,calc((100vw - 760px)/2));padding-right:max(16px,calc((100vw - 760px)/2))}
  body::after{box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--acc) 18%,transparent)}
}

.adm+.adm{margin-left:8px}
@media(max-width:420px){.adm{padding:7px 10px}.ttl small{display:none}}