:root{
  color-scheme:light;
  --bg:#eef1f6;--panel:#ffffff;--ink:#16213a;--muted:#5d6a85;--line:#d5dbe7;--accent:#2646c8;--accent-ink:#ffffff;
  --warn:#a15c00;--warn-bg:#fff3dc;--key:#c0262d;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 "Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",sans-serif;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
h1,h2,h3{margin:0;line-height:1.2}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

.app{display:grid;grid-template-columns:minmax(300px,380px) minmax(0,1fr);gap:20px;max-width:1320px;margin:0 auto;padding:20px}
@media(max-width:900px){.app{grid-template-columns:1fr;padding:12px}}

.controls{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:18px;align-self:start;position:sticky;top:12px;max-height:calc(100vh - 24px);overflow:auto}
@media(max-width:900px){.controls{position:static;max-height:none}}
.controls h1{font-size:20px;margin-bottom:2px}
.sub{color:var(--muted);font-size:13px;margin:0 0 14px}
fieldset{border:0;border-top:1px solid var(--line);margin:0;padding:14px 0 4px}
legend{font-weight:600;font-size:14px;padding:0 0 8px;float:left;width:100%}
fieldset>*:not(legend){clear:both}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:3px}
.f{margin-bottom:10px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
input[type=text],input[type=number],input[type=date],select{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:6px;background:var(--bg);min-height:38px}

.subj{border:1px solid var(--line);border-radius:8px;padding:10px;margin-bottom:8px}
.subj-head{display:flex;align-items:center;gap:8px}
.subj-head input[type=checkbox]{width:18px;height:18px}
.subj-name{flex:1;font-weight:600}
.subj-avail{font-size:12px;color:var(--muted)}
.subj-count{width:72px!important}
.chap-toggle{background:none;border:0;color:var(--accent);padding:6px 0 0;cursor:pointer;font-size:13px}
.chaps{display:none;margin-top:6px}
.chaps.open{display:block}
.chaps label{display:flex;gap:8px;align-items:flex-start;color:var(--ink);padding:3px 0;font-size:13px}
.chaps input{margin-top:3px}

.mix{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.presets{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:10px}
.chip{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:5px 12px;cursor:pointer;font-size:13px}
.chip[aria-pressed=true]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.mixsum{font-size:12px;margin-top:4px;color:var(--muted)}
.mixsum.bad{color:var(--key)}

.btn{border:1px solid var(--accent);background:var(--accent);color:var(--accent-ink);border-radius:8px;padding:10px 16px;cursor:pointer;font-weight:600;min-height:42px}
.btn.alt{background:transparent;color:var(--accent)}
.btn:disabled{opacity:.6;cursor:progress}
.actions{padding-top:10px;border-top:1px solid var(--line)}
.btnrow{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.btnrow .btn{width:100%}

.out{min-width:0}
.bar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.tabs{display:flex;gap:4px;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:3px}
.tab{border:0;background:none;padding:7px 14px;border-radius:6px;cursor:pointer}
.tab[aria-selected=true]{background:var(--accent);color:var(--accent-ink);font-weight:600}
.spacer{flex:1}
.status{font-size:13px;color:var(--muted);margin:8px 0 0;min-height:20px}
.notice{background:var(--warn-bg);color:var(--warn);border-radius:8px;padding:10px 12px;margin-bottom:12px;font-size:13px}
.notice ul{margin:4px 0 0 18px;padding:0}
.empty{background:var(--panel);border:1px dashed var(--line);border-radius:10px;padding:40px 24px;text-align:center;color:var(--muted)}
.empty strong{color:var(--ink);display:block;font-size:17px;margin-bottom:6px}

/* ---------- A4 pages (210 x 297 mm) ---------- */
.sheet-wrap{overflow-x:hidden;padding-bottom:8px}
.pages{width:210mm;margin:0 auto;transform-origin:top left}
.page{position:relative;width:210mm;height:297mm;padding:12mm 12mm 16mm;margin:0 auto 16px;background:#fff;color:#111;overflow:hidden;box-shadow:0 2px 14px rgba(0,0,0,.18);border:1px solid var(--line)}
.pbody,.measure{font-family:Georgia,"Times New Roman",serif;font-size:14px;line-height:1.45;color:#111}
.pfoot{position:absolute;left:12mm;right:12mm;bottom:7mm;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;font:9pt "Segoe UI",system-ui,sans-serif;color:#444;border-top:1px solid #999;padding-top:2mm}
.pfoot span:first-child{font-weight:700;letter-spacing:.08em}
.pfoot span:last-child{text-align:right}
.blk{display:flow-root}
.measure{position:fixed;left:-10000px;top:0;width:186mm;visibility:hidden}
.p-head{text-align:center;border-bottom:2px solid #111;padding-bottom:10px;margin-bottom:10px}
.p-setrow{text-align:right;margin-bottom:4px}
.p-found{font-size:28px;font-weight:700;line-height:1.2}
.p-inst{font-size:23px;font-weight:700;margin-top:4px}
.p-title{font-size:19px;font-weight:700;margin-top:4px}
.p-keyname{font-size:15px;margin-top:6px;letter-spacing:.06em}
.p-meta{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:8px 0;font-size:13.5px}
.p-set{display:inline-block;border:2px solid #111;padding:2px 14px;font-weight:700;font-size:15px;border-radius:3px}
.p-rules{font-size:12.5px;border:1px solid #111;padding:6px 12px;margin-bottom:6px}
.p-rules ol{margin:2px 0 0 18px;padding:0}
.p-sec{font-weight:700;font-size:15px;border-bottom:1px solid #111;margin:10px 0 10px;padding-bottom:2px;display:flex;justify-content:space-between}
.q{display:flex;gap:10px;padding-bottom:12px}
.q-n{flex:0 0 28px;font-weight:700}
.q-b{flex:1;min-width:0}
.q-t{margin:0 0 4px}
.q-o{display:grid;grid-template-columns:1fr 1fr;gap:2px 20px;margin:0;padding:0;list-style:none}
.q-o.long{grid-template-columns:1fr}
.q-o li{display:flex;gap:6px}
.q-o b{font-weight:400}
.q-m{flex:0 0 auto;font-size:12px;white-space:nowrap}
.k-row{display:grid;grid-template-columns:34px 1fr 78px 34%;border:1px solid #111;border-top:0;font-size:13px}
.k-row>div{padding:3px 7px;border-left:1px solid #111}
.k-row>div:first-child{border-left:0}
.k-h{border-top:1px solid #111;font-weight:700;background:#f1f1f1}
.k-a{font-weight:700;color:#b00020}
.key-sol{font-size:11.5px;color:#333;font-weight:400}
.p-end{text-align:center;padding-top:8px;font-size:12px;letter-spacing:.2em}

/* off-screen copy used to make the PDF */
.pdf-holder{position:fixed;left:-10000px;top:0;width:210mm;background:#fff}
.pdf-holder .page{margin:0;box-shadow:none;border:0}

/* ---------- smaller screens ---------- */
.bar{position:sticky;top:0;z-index:5;background:var(--bg);padding:6px 0}
@media(max-width:900px){
  .app{gap:14px}
  input[type=text],input[type=number],input[type=date],select{font-size:16px}
}
@media(max-width:560px){
  .app{padding:8px}
  .controls{padding:14px}
  .row2{grid-template-columns:1fr}
  .mix{gap:6px}
  .tab{padding:8px 10px}
  .bar{gap:6px}
  .bar .btn{flex:1 1 100%}
}
@page{size:A4;margin:12mm}
@media print{
  body{background:#fff}
  .controls,.bar,.status,.notice,.empty{display:none!important}
  .app{display:block;padding:0;max-width:none}
  .pages{zoom:1!important;width:auto}
  .page{box-shadow:none;border:0;margin:0;break-after:page}
}