/* Layout: one narrow "Heft" column on squared paper; teacher's red pen for corrections, ink blue for actions */
:root{
  --paper:#f7f8f5; --sheet:#ffffff; --grid:#dfe6ee; --ink:#1d2a44; --muted:#5d6a80;
  --blue:#2346c8; --blue-soft:#e6ebfb; --red:#d0342c; --red-soft:#fbe7e5; --green:#1f8a4c; --green-soft:#e2f4e9;
  --line:#d5dbe4; --on-blue:#ffffff; --shadow:0 1px 0 rgba(29,42,68,.06),0 8px 24px -12px rgba(29,42,68,.25);
  --f-display:"Bricolage Grotesque",ui-rounded,system-ui,sans-serif;
  --f-body:"Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-hand:"Caveat","Comic Sans MS",cursive;
  --k1:#2346c8; --k2:#c2410c; --k3:#15803d;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --paper:#121620; --sheet:#1a202d; --grid:#242c3b; --ink:#e7ebf3; --muted:#9aa6bb;
  --blue:#7d9bff; --blue-soft:#1f2a4a; --red:#ff7a70; --red-soft:#3a1f22; --green:#5fd48f; --green-soft:#16301f;
  --line:#2d3546; --on-blue:#0e1424; --shadow:0 1px 0 rgba(0,0,0,.3),0 8px 24px -12px rgba(0,0,0,.6);
  --k1:#7d9bff; --k2:#fb923c; --k3:#4ade80; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#121620; --sheet:#1a202d; --grid:#242c3b; --ink:#e7ebf3; --muted:#9aa6bb;
  --blue:#7d9bff; --blue-soft:#1f2a4a; --red:#ff7a70; --red-soft:#3a1f22; --green:#5fd48f; --green-soft:#16301f;
  --line:#2d3546; --on-blue:#0e1424; --shadow:0 1px 0 rgba(0,0,0,.3),0 8px 24px -12px rgba(0,0,0,.6);
  --k1:#7d9bff; --k2:#fb923c; --k3:#4ade80; color-scheme:dark}

*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--paper);color:var(--ink);font:16px/1.5 var(--f-body);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:22px 22px;min-height:100%}
.wrap{max-width:720px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:20px 48px;display:grid;gap:18px}
h1,h2,h3{font-family:var(--f-display);margin:0;text-wrap:balance;letter-spacing:-.01em}
h1{font-size:clamp(1.7rem,5vw,2.3rem);font-weight:800}
h2{font-size:1.35rem;font-weight:700}
h3{font-size:1.05rem;font-weight:700}
p{margin:0}
.muted{color:var(--muted)}
.hand{font-family:var(--f-hand);font-size:1.35rem;line-height:1.1}
.label{font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:700}
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.sheet{background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow);display:grid;gap:14px;min-width:0}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
button{font:inherit;cursor:pointer}
.btn{border:0;border-radius:10px;padding:12px 18px;font-weight:700;background:var(--blue);color:var(--on-blue);font-size:1rem;min-height:46px}
.btn:hover{filter:brightness(1.07)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.ghost{background:transparent;color:var(--blue);border:1.5px solid var(--blue)}
.btn.plain{background:transparent;color:var(--muted);padding:8px 10px;min-height:36px;font-weight:700}
.btn.danger{background:transparent;color:var(--red);border:1.5px solid var(--red);padding:6px 10px;min-height:34px;font-size:.85rem}
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
input,select,textarea{font:inherit;color:var(--ink);background:var(--sheet);border:1.5px solid var(--line);border-radius:10px;padding:10px 12px;width:100%;min-width:0}
textarea{min-height:110px;resize:vertical}
.field{display:grid;gap:6px;min-width:0}
.field>span{font-weight:700;font-size:.92rem}

/* profiles */
.kids{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px}
.kid{background:var(--sheet);border:1px solid var(--line);border-radius:16px;padding:18px;text-align:left;display:grid;gap:10px;box-shadow:var(--shadow);color:var(--ink);transition:transform .15s}
.kid:hover{transform:translateY(-2px)}
.avatar{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;font:800 1.5rem var(--f-display);color:#fff;background:var(--kc)}
.kid .name{font:700 1.3rem var(--f-display)}
.chip{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:3px 10px;font-size:.8rem;font-weight:700;background:var(--blue-soft);color:var(--blue)}
.chip.red{background:var(--red-soft);color:var(--red)}
.chip.green{background:var(--green-soft);color:var(--green)}

/* probe list */
.probe{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:12px 0;border-top:1px dashed var(--line)}
.probe:first-child{border-top:0}
.days{width:58px;text-align:center;border-radius:10px;padding:6px 0;background:var(--blue-soft);color:var(--blue);font:800 1.3rem/1 var(--f-display);font-variant-numeric:tabular-nums}
.days small{display:block;font:700 .65rem var(--f-body);letter-spacing:.05em;text-transform:uppercase;margin-top:3px}
.days.soon{background:var(--red-soft);color:var(--red)}
.probe .t{min-width:0}
.probe .t b{display:block;overflow-wrap:anywhere}

/* quiz */
.progress{height:8px;background:var(--line);border-radius:99px;overflow:hidden}
.progress i{display:block;height:100%;background:var(--blue);width:0;transition:width .3s}
.q{font:700 1.3rem/1.35 var(--f-display);overflow-wrap:anywhere}
.opts{display:grid;gap:10px}
.opt{text-align:left;border:1.5px solid var(--line);background:var(--sheet);color:var(--ink);border-radius:12px;padding:14px 16px;font-size:1.05rem;display:flex;gap:12px;align-items:flex-start}
.opt .k{font:800 .9rem var(--f-display);color:var(--muted);min-width:1.2em}
.opt:hover:not(:disabled){border-color:var(--blue)}
.opt.right{border-color:var(--green);background:var(--green-soft)}
.opt.wrong{border-color:var(--red);background:var(--red-soft)}
.opt:disabled{cursor:default}
.fb{border-radius:12px;padding:14px 16px;display:grid;gap:6px}
.fb.ok{background:var(--green-soft)}
.fb.no{background:var(--red-soft)}
.fb .hand{color:var(--red)}
.fb.ok .hand{color:var(--green)}
.ru{font-size:.92rem;color:var(--muted);border-left:3px solid var(--line);padding-left:10px}

/* result */
.grade{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:center}
.circle{width:110px;height:110px;border-radius:50%;border:4px solid var(--red);display:grid;place-items:center;font:800 3.4rem/1 var(--f-display);color:var(--red);transform:rotate(-6deg)}
.mist{display:grid;gap:10px}
.mist div{border-left:3px solid var(--red);padding:4px 0 4px 12px}
.hist{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
.hist td,.hist th{padding:8px 6px;border-top:1px solid var(--line);text-align:left;font-size:.95rem}
.hist th{font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.tbl{overflow-x:auto}

.thumbs{display:flex;gap:8px;flex-wrap:wrap}
.thumbs figure{margin:0;position:relative}
.thumbs img{width:76px;height:76px;object-fit:cover;border-radius:8px;border:1px solid var(--line)}
.thumbs button{position:absolute;top:-6px;right:-6px;width:24px;height:24px;border-radius:50%;border:0;background:var(--red);color:#fff;font-weight:800;line-height:1}
.drop{border:2px dashed var(--line);border-radius:12px;padding:16px;text-align:center;color:var(--muted);cursor:pointer}
.drop:hover{border-color:var(--blue);color:var(--blue)}
.sheetout{white-space:normal;display:grid;gap:8px;overflow-wrap:anywhere}
.sheetout ul{margin:0;padding-left:1.2em}
.spinner{width:42px;height:42px;border-radius:50%;border:4px solid var(--blue-soft);border-top-color:var(--blue);animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
.note{font-size:.9rem;border-radius:10px;padding:10px 12px;background:var(--blue-soft);color:var(--ink)}
.note.warn{background:var(--red-soft)}
.toggle{display:flex;gap:8px;align-items:center;font-weight:700;font-size:.92rem}
.toggle input{width:20px;height:20px}
@media (max-width:480px){.grade{grid-template-columns:1fr;justify-items:start}.probe{grid-template-columns:auto 1fr}.probe .acts{grid-column:1/-1}}

/* PWA additions */
body{padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);-webkit-tap-highlight-color:transparent}
[hidden]{display:none!important}
.pin{display:grid;gap:16px;justify-items:center;text-align:center}
.dots{display:flex;gap:14px}
.dots i{width:16px;height:16px;border-radius:50%;border:2px solid var(--ink);display:block}
.dots i.on{background:var(--ink)}
.pad{display:grid;grid-template-columns:repeat(3,72px);gap:12px}
.pad button{height:72px;border-radius:50%;border:1.5px solid var(--line);background:var(--sheet);color:var(--ink);font:700 1.6rem var(--f-display)}
.pad button:active{background:var(--blue-soft)}
.pad .empty{visibility:hidden}
.err{color:var(--red);font-weight:700;min-height:1.5em}
.kidrow{display:grid;gap:12px}
.board{display:grid;gap:2px}
.brow{display:grid;grid-template-columns:2rem auto 1fr auto;gap:10px;align-items:center;padding:8px 6px;border-radius:10px;font-variant-numeric:tabular-nums}
.brow.me{background:var(--blue-soft)}
.brow .rk{font:800 1.1rem var(--f-display);color:var(--muted);text-align:center}
.brow .rk.top{color:var(--red)}
.brow .av{width:30px;height:30px;font-size:.95rem}
.brow .nm{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700}
.brow .nm small{display:block;font-weight:400;color:var(--muted);font-size:.8rem}
.brow .pt{font:800 1.15rem var(--f-display)}
.matrow{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:8px 0;border-top:1px dashed var(--line)}
.matrow:first-child{border-top:0}
.matrow b{display:block;overflow-wrap:anywhere}
.wrap>section{width:100%;min-width:0}