:root{
  --ground:#EEF4FC; --surface:#FFFFFF; --surface-2:#F4F8FE; --ink:#0B1F5C; --ink-2:#4B5E88; --ink-3:#8394B8; --line:#DDE7F5;
  --primary:#005BFD; --primary-soft:#E3EEFF; --sky:#7CC5FC;
  --ok:#12915A; --ok-soft:#E2F5EC; --warn:#B87D00; --warn-soft:#FDF3DC; --bad:#CF3A3A; --bad-soft:#FBE7E7;
  --shadow:0 1px 2px rgba(11,31,92,.06),0 8px 24px rgba(11,31,92,.08);
  --display:"Montserrat","Avenir Next","Segoe UI",system-ui,sans-serif; --body:"Manrope","Segoe UI",system-ui,sans-serif;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){color-scheme:dark;
  --ground:#07122B; --surface:#0E1C40; --surface-2:#13254F; --ink:#EAF2FF; --ink-2:#A3B5DA; --ink-3:#6F84B3; --line:#20355F;
  --primary:#3D8BFF; --primary-soft:#16306A;
  --ok:#3CC98A; --ok-soft:#0F3A2C; --warn:#E8B340; --warn-soft:#3A2E10; --bad:#FF7B7B; --bad-soft:#3E1B24;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);}}
*{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;background:var(--ground);color:var(--ink);font:14px/1.55 var(--body);-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
a{color:var(--primary)}
h1,h2,h3{font-family:var(--display);margin:0;text-wrap:balance}
h1{font-size:24px;font-weight:700}
h2{font-size:16px;font-weight:600}
h3{font-size:14px;font-weight:600}
.muted{color:var(--ink-2)}
.small{font-size:12.5px}
.eyebrow{font:600 11px/1 var(--display);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3)}

.app{display:grid;grid-template-columns:232px minmax(0,1fr);min-height:100vh}
@media (max-width:900px){.app{grid-template-columns:1fr}}
.side{background:var(--surface);border-right:1px solid var(--line);padding:20px 14px;display:flex;flex-direction:column;gap:18px;position:sticky;top:0;height:100vh}
@media (max-width:900px){.side{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:12px 16px;flex-direction:row;align-items:center;gap:12px;overflow-x:auto}}
.brand{display:flex;align-items:center;gap:10px;padding:0 6px;text-decoration:none;color:inherit}
.brand img{width:26px}
.brand b{font:600 16px/1 var(--display);letter-spacing:.28em}
.brand small{display:block;font-size:11px;color:var(--ink-3);letter-spacing:.04em}
.side nav{display:flex;flex-direction:column;gap:2px}
@media (max-width:900px){.side nav{flex-direction:row}.side .foot{display:none}}
.side nav a{display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:10px;color:var(--ink-2);font-weight:500;white-space:nowrap;text-decoration:none}
.side nav a:hover{background:var(--surface-2);color:var(--ink)}
.side nav a[aria-current="true"]{background:var(--primary-soft);color:var(--primary);font-weight:700}
.side nav .badge{margin-left:auto;background:var(--bad);color:#fff;border-radius:99px;font-size:11px;font-weight:700;padding:1px 7px}
.side .foot{margin-top:auto;font-size:12px;color:var(--ink-3);padding:0 8px;display:flex;flex-direction:column;gap:8px}
.main{padding:24px 28px 64px;min-width:0;max-width:1180px}
@media (max-width:900px){.main{padding:18px 16px 48px}}
.topbar{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:20px}
.topbar .actions{display:flex;gap:8px;flex-wrap:wrap}
.crumbs{font-size:12.5px;color:var(--ink-3);margin-bottom:6px}
.crumbs a{color:var(--ink-2);text-decoration:none}
.crumbs a:hover{text-decoration:underline}

.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:18px}
.card + .card{margin-top:16px}
.card > header{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.stack{display:flex;flex-direction:column;gap:14px}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:16px}
.kpi{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 16px;display:flex;flex-direction:column;gap:4px;text-decoration:none;color:inherit}
.kpi span{font-size:12px;color:var(--ink-2)}
.kpi b{font:700 22px/1.1 var(--display);font-variant-numeric:tabular-nums}

.btn{all:unset;box-sizing:border-box;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:38px;padding:8px 14px;border-radius:10px;background:var(--primary);color:#fff;font:600 13.5px/1.2 var(--display);white-space:nowrap}
.btn:hover{filter:brightness(1.06)}
.btn.line{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn.soft{background:var(--primary-soft);color:var(--primary)}
.btn.danger{background:var(--bad-soft);color:var(--bad)}
.btn.ok{background:var(--ok-soft);color:var(--ok)}
.btn.sm{min-height:30px;padding:5px 10px;font-size:12.5px}
.btn.icon{min-height:30px;width:30px;padding:0}
.btn[disabled]{opacity:.45;pointer-events:none}
.btn.tg{background:#2AABEE}

.field{display:flex;flex-direction:column;gap:6px}
.field > label, .lbl{font-size:12.5px;font-weight:700;color:var(--ink-2)}
.hint{font-size:12px;color:var(--ink-3)}
.inp{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:8px 10px;min-height:38px;width:100%}
textarea.inp{min-height:110px;resize:vertical;line-height:1.5}
textarea.inp.tall{min-height:260px}
textarea.inp.code{font:12.5px/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;min-height:420px;white-space:pre}
.check{display:inline-flex;align-items:center;gap:8px;cursor:pointer;font-weight:600}
.check input{width:18px;height:18px;accent-color:var(--primary)}

.chip{display:inline-flex;align-items:center;gap:5px;padding:3px 9px;border-radius:99px;font-size:11.5px;font-weight:700;white-space:nowrap}
.chip::before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor}
.c-ok{background:var(--ok-soft);color:var(--ok)}.c-warn{background:var(--warn-soft);color:var(--warn)}.c-bad{background:var(--bad-soft);color:var(--bad)}.c-pri{background:var(--primary-soft);color:var(--primary)}.c-mute{background:var(--surface-2);color:var(--ink-2)}

.tw{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:middle}
th{font-size:11.5px;color:var(--ink-3);font-weight:700;letter-spacing:.04em;text-transform:uppercase;white-space:nowrap}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
td .actions{display:flex;gap:6px;justify-content:flex-end;flex-wrap:wrap}
tr.click{cursor:pointer}
tr.click:hover{background:var(--surface-2)}
.empty{padding:28px;text-align:center;color:var(--ink-3)}

/* структура курса */
.module{border:1px solid var(--line);border-radius:14px;overflow:hidden}
.module + .module{margin-top:12px}
.module > header{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--surface-2)}
.module > header input{flex:1;min-width:120px;font-weight:700;background:transparent;border:1px solid transparent;border-radius:8px;padding:6px 8px}
.module > header input:hover,.module > header input:focus{border-color:var(--line);background:var(--surface)}
.lrow{display:flex;align-items:center;gap:10px;padding:9px 12px;border-top:1px solid var(--line)}
.lrow .n{width:26px;height:26px;border-radius:8px;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;font:700 12px/1 var(--display);flex:none}
.lrow .t{flex:1;min-width:0;font-weight:600;cursor:pointer}
.lrow .t:hover{color:var(--primary)}
.lrow .meta{display:flex;gap:6px;align-items:center;font-size:12px;color:var(--ink-3);flex-wrap:wrap}
.lrow .tools{display:flex;gap:4px}
.module .add{padding:8px 12px;border-top:1px dashed var(--line)}

/* тест */
.q{border:1px solid var(--line);border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:10px;background:var(--surface-2)}
.q + .q{margin-top:10px}
.q header{display:flex;align-items:center;gap:8px}
.q header b{font:700 13px/1 var(--display);color:var(--ink-3)}
.q header .grow{flex:1}
.opt{display:flex;align-items:center;gap:8px}
.opt .k{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;font:700 12px/1 var(--display);background:var(--surface);border:1px solid var(--line);flex:none}
.opt input[type=radio]{width:18px;height:18px;accent-color:var(--ok);flex:none}
.opt.right .k{background:var(--ok-soft);color:var(--ok);border-color:var(--ok)}

/* файлы */
.drop{display:block;border:2px dashed var(--line);border-radius:14px;padding:22px;text-align:center;color:var(--ink-2);cursor:pointer;transition:border-color .15s,background .15s}
.drop:hover,.drop.over{border-color:var(--primary);background:var(--primary-soft)}
.drop b{color:var(--primary)}
.files{display:flex;flex-direction:column;gap:10px;margin-top:12px}
.file{border:1px solid var(--line);border-radius:12px;padding:10px 12px;display:flex;flex-direction:column;gap:8px}
.file .top{display:flex;align-items:center;gap:10px}
.file .ico{font-size:20px;width:28px;text-align:center;flex:none}
.file input.inp{min-height:32px;padding:5px 8px}
.file audio,.file video{width:100%;max-height:320px;border-radius:8px;background:#000}
.file audio{background:none}
.bar{height:6px;background:var(--surface-2);border-radius:99px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--primary);width:0;transition:width .2s}

details.adv{border:1px solid var(--line);border-radius:12px;padding:10px 14px}
details.adv summary{cursor:pointer;font-weight:700;color:var(--ink-2)}
details.adv[open] summary{margin-bottom:10px}

.savebar{position:sticky;bottom:0;margin-top:18px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:10px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px;box-shadow:var(--shadow);z-index:5}
.savebar .dirty{color:var(--warn);font-weight:700}

/* вход */
.login{min-height:100vh;display:grid;place-items:center;padding:24px}
.login .card{max-width:420px;width:100%;text-align:center;display:flex;flex-direction:column;gap:16px;align-items:center;padding:32px 26px;box-shadow:var(--shadow)}
.login img{width:72px}
.login .word{font:600 26px/1 var(--display);letter-spacing:.3em;margin-right:-.3em}
.spinner{width:28px;height:28px;border:3px solid var(--primary-soft);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(1turn)}}
.center{display:grid;place-items:center;min-height:40vh}

.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--ink);color:var(--surface);padding:10px 16px;border-radius:12px;font-weight:600;box-shadow:var(--shadow);z-index:50;max-width:calc(100% - 32px)}
.toast.bad{background:var(--bad);color:#fff}
.err{background:var(--bad-soft);color:var(--bad);border-radius:10px;padding:10px 12px;font-weight:600;white-space:pre-wrap}