/* LMS Red Button — «стекло»: полупрозрачные панели на мягком градиентном фоне */
:root{
  --bg:#eef1f8; --card:rgba(255,255,255,.58); --card-solid:#fff;
  --line:rgba(255,255,255,.75); --line-soft:rgba(120,135,165,.18);
  --text:#4f5f72; --head:#2f3a4d; --muted:#8494a8;
  --accent:#5b61f0; --accent-soft:rgba(91,97,240,.13); --ok:#5fc22e; --ok-soft:rgba(95,194,46,.16);
  --warn:#e9a21a; --warn-soft:rgba(233,162,26,.18); --bad:#e8452b; --bad-soft:rgba(232,69,43,.14);
  --radius:14px;
  --glass:blur(16px) saturate(170%);
  --shadow:0 10px 30px rgba(46,60,90,.10), 0 1px 0 rgba(255,255,255,.7) inset;
}
*{box-sizing:border-box}
html,body{min-height:100%}
body{
  margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--text);font-size:14px;line-height:1.55;
  background:
    radial-gradient(900px 600px at 8% 4%, #dfe6ff 0%, rgba(223,230,255,0) 60%),
    radial-gradient(800px 520px at 92% 6%, #ffe6f3 0%, rgba(255,230,243,0) 62%),
    radial-gradient(760px 620px at 78% 92%, #dcf3ff 0%, rgba(220,243,255,0) 60%),
    radial-gradient(700px 520px at 18% 96%, #e8f7e6 0%, rgba(232,247,230,0) 62%),
    linear-gradient(160deg,#f3f5fb 0%,#eef1f8 100%);
  background-attachment:fixed;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.layout{display:flex;min-height:100vh}
/* стеклянный сайдбар */
.side{
  width:240px;flex:0 0 240px;padding:18px 14px;position:sticky;top:0;height:100vh;
  background:rgba(255,255,255,.50);
  -webkit-backdrop-filter:var(--glass);backdrop-filter:var(--glass);
  border-right:1px solid var(--line);
  box-shadow:1px 0 0 rgba(120,135,165,.10), 0 10px 40px rgba(46,60,90,.06);
}
.brand{display:flex;align-items:center;gap:9px;padding:2px 8px 18px}
.brand b{color:var(--head);font-size:15px;letter-spacing:.2px}
.brand span{color:var(--muted);font-size:11px;display:block}
.dot{width:10px;height:10px;border-radius:4px;background:linear-gradient(135deg,#7b80ff,#4a51e8);box-shadow:0 0 0 3px rgba(91,97,240,.14)}
.nav{display:flex;flex-direction:column;gap:2px}
.nav a{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:10px;color:var(--text);font-size:13.5px;border:1px solid transparent}
.nav a:hover{background:rgba(255,255,255,.62);border-color:rgba(255,255,255,.9);text-decoration:none}
.nav a.on{background:rgba(255,255,255,.78);border-color:rgba(255,255,255,.95);color:var(--accent);font-weight:600;box-shadow:0 6px 16px rgba(46,60,90,.08)}
.nav .sep{height:1px;background:var(--line-soft);margin:10px 4px}
.nav .lbl{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);padding:10px 10px 4px}
.ico{width:17px;height:17px;flex:0 0 17px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
/* контент */
.main{flex:1;min-width:0;padding:20px 26px 40px}
.top{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:18px}
.top h1{margin:0;font-size:21px;color:var(--head);font-weight:600}
.top .sub{color:var(--muted);font-size:12.5px;margin-top:3px}
.who{display:flex;align-items:center;gap:10px;font-size:13px;padding:7px 12px;border-radius:12px;
  background:rgba(255,255,255,.55);border:1px solid var(--line);
  -webkit-backdrop-filter:var(--glass);backdrop-filter:var(--glass)}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,#8d93ff,#5b61f0);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700}
/* сетки */
.grid{display:grid;gap:16px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
/* стеклянные карточки */
.card,.course,.login{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  -webkit-backdrop-filter:var(--glass);backdrop-filter:var(--glass);
  padding:16px 18px;
  position:relative;
  overflow:hidden;
}
.card::before,.course::before{
  content:"";position:absolute;inset:0 0 auto 0;height:46%;
  background:linear-gradient(180deg,rgba(255,255,255,.55),rgba(255,255,255,0));
  pointer-events:none;
}
.card>*,.course>*{position:relative}
.card h2{margin:0 0 12px;font-size:15px;color:var(--head);font-weight:600}
.kpi{font-size:27px;font-weight:700;color:var(--head);line-height:1.2}
.kpi-l{font-size:12px;color:var(--muted);margin-top:2px}
.badge{display:inline-block;padding:2px 8px;border-radius:20px;font-size:11.5px;font-weight:600;border:1px solid transparent}
.b-ok{background:var(--ok-soft);color:#398014;border-color:rgba(95,194,46,.25)}
.b-warn{background:var(--warn-soft);color:#946200;border-color:rgba(233,162,26,.3)}
.b-bad{background:var(--bad-soft);color:#a72c16;border-color:rgba(232,69,43,.25)}
.b-mut{background:rgba(255,255,255,.6);color:#7b8794;border-color:rgba(120,135,165,.2)}
.b-acc{background:var(--accent-soft);color:var(--accent);border-color:rgba(91,97,240,.24)}
/* прогресс */
.bar{height:7px;background:rgba(120,135,165,.18);border-radius:20px;overflow:hidden}
.bar i{display:block;height:100%;background:linear-gradient(90deg,#8d93ff,#5b61f0);border-radius:20px}
.bar.ok i{background:linear-gradient(90deg,#8fdd5f,#5fc22e)}
/* курс */
.course .t{font-size:15px;font-weight:600;color:var(--head);margin-bottom:2px}
.course .s{font-size:12.5px;color:var(--muted);margin-bottom:12px}
.course .row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:10px}
.accent{height:4px;border-radius:4px;margin-bottom:12px;opacity:.85}
/* кнопки */
.btn{display:inline-flex;align-items:center;gap:8px;padding:8px 15px;border-radius:10px;border:1px solid transparent;
  background:linear-gradient(135deg,#6f75ff,#4a51e8);color:#fff;font-size:13.5px;font-weight:600;cursor:pointer;
  font-family:inherit;box-shadow:0 6px 16px rgba(74,81,232,.24)}
.btn:hover{filter:brightness(1.04);text-decoration:none}
.btn.ghost{background:rgba(255,255,255,.62);color:var(--text);border-color:var(--line);box-shadow:0 4px 12px rgba(46,60,90,.06)}
.btn.sm{padding:5px 11px;font-size:12.5px;border-radius:9px}
.btn.danger{background:rgba(255,255,255,.62);color:var(--bad);border-color:rgba(232,69,43,.3);box-shadow:none}
/* таблицы */
table{width:100%;border-collapse:collapse;font-size:13px}
th{text-align:left;font-weight:600;color:var(--muted);font-size:11.5px;text-transform:uppercase;letter-spacing:.05em;
  padding:8px 10px;border-bottom:1px solid var(--line-soft)}
td{padding:10px;border-bottom:1px solid rgba(120,135,165,.13);vertical-align:middle}
tr:last-child td{border-bottom:none}
.num{font-variant-numeric:tabular-nums}
/* урок */
.lesson{max-width:820px}
.lesson .body{font-size:14.5px;color:#46586c;line-height:1.75}
.lesson .body b{color:var(--head)}
.lnav{display:flex;flex-direction:column;gap:2px;max-height:420px;overflow:auto}
.lnav a{display:flex;gap:8px;align-items:center;padding:7px 9px;border-radius:9px;font-size:13px;color:var(--text)}
.lnav a:hover{background:rgba(255,255,255,.6);text-decoration:none}
.lnav a.on{background:rgba(255,255,255,.82);color:var(--accent);font-weight:600;box-shadow:0 4px 12px rgba(46,60,90,.07)}
.lnav a .n{width:20px;height:20px;border-radius:50%;border:1px solid var(--line-soft);display:flex;align-items:center;
  justify-content:center;font-size:11px;color:var(--muted);flex:0 0 20px;background:rgba(255,255,255,.5)}
.lnav a.done .n{background:var(--ok);border-color:var(--ok);color:#fff}
/* формы */
label{display:block;font-size:12.5px;color:var(--muted);margin:10px 0 4px}
input[type=text],input[type=password],input[type=date],input[type=number],textarea,select{
  width:100%;padding:9px 11px;border:1px solid rgba(255,255,255,.9);border-radius:10px;font-family:inherit;font-size:13.5px;
  background:rgba(255,255,255,.72);color:var(--head);box-shadow:0 2px 8px rgba(46,60,90,.05) inset}
textarea{min-height:92px;resize:vertical}
input:focus,textarea:focus,select:focus{outline:2px solid rgba(91,97,240,.25);border-color:rgba(91,97,240,.5);background:#fff}
.opt{display:flex;align-items:center;gap:9px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;margin-bottom:8px;cursor:pointer;
  background:rgba(255,255,255,.45)}
.opt:hover{border-color:rgba(91,97,240,.45);background:rgba(255,255,255,.78)}
.opt input{accent-color:var(--accent);width:16px;height:16px}
.flash{background:var(--bad-soft);color:#a72c16;padding:10px 13px;border-radius:10px;margin-bottom:14px;font-size:13px;
  border:1px solid rgba(232,69,43,.22)}
.mut{color:var(--muted)}
/* логин */
.login-wrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.login{width:100%;max-width:372px;padding:26px;border-radius:18px;
  background:rgba(255,255,255,.62);box-shadow:0 20px 50px rgba(46,60,90,.16),0 1px 0 rgba(255,255,255,.8) inset}
.login h1{font-size:18px;color:var(--head);margin:0 0 4px}
.login p{color:var(--muted);font-size:12.5px;margin:0 0 14px}
/* фолбэк без backdrop-filter */
@supports not ((backdrop-filter:blur(2px)) or (-webkit-backdrop-filter:blur(2px))){
  .side{background:rgba(255,255,255,.9)}
  .card,.course,.login{background:rgba(255,255,255,.93)}
}
@media(max-width:1100px){.g4{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.g3,.g2,.g4{grid-template-columns:1fr}}
@media(max-width:640px){
  .layout{flex-direction:column}
  .side{width:100%;flex:none;height:auto;position:static;border-right:none;border-bottom:1px solid var(--line);padding:10px 12px}
  .brand{padding:0 4px 8px}
  .nav{flex-direction:row;overflow-x:auto;gap:6px;padding-bottom:4px}
  .nav a{white-space:nowrap;padding:7px 10px}
  .nav .sep,.nav .lbl{display:none}
  .main{padding:14px 14px 32px}
  .top h1{font-size:18px}
  .who{padding:5px 8px}
  .who span{display:none}
}

/* страница уведомлений */
.tg-wrap{display:grid;grid-template-columns:1fr 360px;gap:16px;align-items:start}
.tg-wrap .card{min-width:0}
.brk{word-break:break-all;font-size:12px}
@media(max-width:760px){.tg-wrap{grid-template-columns:1fr}}

/* возврат на офис-портал */
.portal-back{display:block;text-align:center;margin-top:16px;font-size:12.5px;color:var(--mut);text-decoration:none}
.portal-back:hover{color:var(--accent)}

/* редактор урока */
.ed-switch{display:flex;gap:2px;background:rgba(255,255,255,.6);border:1px solid var(--line);border-radius:9px;padding:2px}
.ed-switch button{background:none;border:0;font:inherit;font-size:11.5px;color:var(--muted);padding:5px 10px;border-radius:7px;cursor:pointer}
.ed-switch button.on{background:#fff;color:var(--head);box-shadow:0 1px 3px rgba(30,40,70,.09)}
.ed-toolbar{display:flex;gap:2px;flex-wrap:wrap;align-items:center;margin:8px 0 0;padding:6px;background:rgba(255,255,255,.7);border:1px solid var(--line);border-radius:10px 10px 0 0;border-bottom:0}
.ed-toolbar button{background:none;border:0;font:inherit;font-size:12px;color:var(--head);padding:6px 9px;border-radius:7px;cursor:pointer}
.ed-toolbar button:hover{background:rgba(91,97,240,.12);color:var(--accent)}
.ed-sep{width:1px;height:18px;background:var(--line);margin:0 4px}
.ed-area{min-height:340px;max-height:70vh;overflow:auto;background:#fff;border:1px solid var(--line);border-radius:0 0 10px 10px;padding:18px 20px;font-size:14px;line-height:1.65;color:var(--body)}
.ed-area:focus{outline:2px solid rgba(91,97,240,.35);outline-offset:-1px}
.ed-area.src{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px;white-space:pre-wrap;border-radius:10px;min-height:420px}
.ed-src{display:none}
.ed-area h3{font-size:16px;color:var(--head);margin:14px 0 6px}
.ed-area p{margin:0 0 10px}
.ed-area ul,.ed-area ol{margin:0 0 10px;padding-left:22px}
.ed-area li{margin-bottom:4px}
.ed-area a{color:var(--accent)}

/* подсказки и примеры в редакторе */
.tips{margin:0;padding-left:18px;font-size:12.5px;line-height:1.55;color:var(--body)}
.tips li{margin-bottom:7px}
.samples{display:flex;flex-direction:column;gap:7px}
.samples button{text-align:left;background:rgba(255,255,255,.75);border:1px solid var(--line);border-radius:9px;
  padding:9px 11px;font:inherit;font-size:12.5px;color:var(--head);cursor:pointer}
.samples button:hover{border-color:var(--accent);color:var(--accent);background:#fff}

/* проверка по уроку */
.lquiz{margin-top:22px;padding:16px;border:1px solid var(--line);border-radius:12px;background:rgba(255,255,255,.5)}
.lquiz-h{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;margin-bottom:10px}
.lquiz-q{padding:12px 0;border-top:1px solid var(--line-soft)}
.lquiz-q.good{background:rgba(95,194,46,.06)}
.lquiz-q.bad{background:rgba(232,69,43,.05)}
.lq-opt{cursor:pointer}
.lq-opt.ok span{color:var(--ok);font-weight:600}
.lq-opt.err span{color:var(--bad);text-decoration:line-through}
.lq-expl{margin-top:7px;font-size:12.5px;color:var(--muted);background:#fff;border-left:3px solid var(--warn);padding:7px 10px;border-radius:0 6px 6px 0}

.steps{margin:0;padding-left:0;list-style:none;counter-reset:st;font-size:13px;line-height:1.55;color:var(--body)}
.steps li{counter-increment:st;position:relative;padding:0 0 12px 34px;margin:0}
.steps li:before{content:counter(st);position:absolute;left:0;top:-1px;width:22px;height:22px;border-radius:50%;
  background:var(--accent);color:#fff;font-size:11.5px;font-weight:700;display:flex;align-items:center;justify-content:center}
.steps li b{color:var(--head)}

/* подтверждение личности через Telegram */
.authgate{margin-top:18px;padding:14px 16px;border:1px solid rgba(91,97,240,.35);border-radius:12px;
  background:linear-gradient(180deg,rgba(91,97,240,.07),rgba(91,97,240,.02))}