:root{
  --ink:#0B2545;
  --ink-2:#13315C;
  --line:#2A4D78;
  --paper:#EAF2FB;
  --paper-dim:#9FB4CC;
  --amber:#F2A541;
  --amber-dim:#7A5A26;
  --green:#5FD3A0;
  --danger:#E0697A;
  --mono: "JetBrains Mono","Fira Code","SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
  --sans: "Atkinson Hyperlegible","Inter",-apple-system,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--ink);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
  background-position: -1px -1px;
  color:var(--paper);
  font-family:var(--sans);
  line-height:1.5;
  min-height:100vh;
}
a{ color:var(--amber); }

/* ---------- Shared layout ---------- */
.app, .doc{
  max-width:900px;
  margin:0 auto;
  padding:32px 20px 80px;
}
.kicker{
  font-family:var(--mono);
  font-size:13.5px;
  letter-spacing:0.18em;
  color:var(--amber);
  margin-bottom:8px;
}
h1{
  font-family:var(--mono);
  font-size:clamp(26px,5vw,36px);
  margin:0 0 8px 0;
  letter-spacing:-0.01em;
  color:var(--paper);
}
.sub{
  color:var(--paper-dim);
  margin:0 0 22px 0;
  max-width:60ch;
}

/* ---------- Tracker: masthead / minimap ---------- */
.masthead{
  border-bottom:1px solid var(--line);
  padding-bottom:24px;
  margin-bottom:24px;
}
.minimap{ display:flex; gap:6px; flex-wrap:wrap; margin-bottom:14px; }
.minimap .cell{
  width:30px; height:30px;
  border:1px solid var(--line);
  position:relative; overflow:hidden;
  background:var(--ink-2);
}
.minimap .cell .fill{
  position:absolute; left:0; right:0; bottom:0;
  background:var(--amber);
  transition:height .35s ease;
}
.minimap .cell.done .fill{ background:var(--green); }
.minimap .cell .num{
  position:relative; z-index:1;
  font-family:var(--mono); font-size:11.5px; color:var(--paper-dim);
  display:flex; align-items:center; justify-content:center; height:100%;
  mix-blend-mode:difference;
}
.overall-row{ display:flex; align-items:baseline; gap:8px; font-family:var(--mono); }
.overall-row .pct{ font-size:24px; color:var(--amber); }
.overall-row .pct-label{ font-size:14.5px; color:var(--paper-dim); }

/* ---------- Tracker: controls ---------- */
.controls{
  border:1px solid var(--line);
  background:rgba(255,255,255,0.02);
  padding:16px;
  margin-bottom:28px;
  display:flex; flex-wrap:wrap; gap:12px 16px; align-items:flex-end;
}
.controls label.field{
  display:flex; flex-direction:column; gap:4px;
  font-family:var(--mono); font-size:13px; color:var(--paper-dim);
  flex:1 1 180px;
}
.controls input[type="text"]{
  background:var(--ink); border:1px solid var(--line); color:var(--paper);
  font-family:var(--sans); font-size:16px; padding:8px 10px;
}
.controls input[type="text"]:focus-visible{ outline:2px solid var(--amber); outline-offset:1px; }
.btns{ display:flex; gap:10px; flex-wrap:wrap; }
.status{ width:100%; font-family:var(--mono); font-size:12px; color:var(--paper-dim); margin:6px 0 0 0; }
.status.warn{ color:var(--amber); }

/* ---------- Shared buttons ---------- */
button, .filebtn, .btn{
  font-family:var(--mono); font-size:13.5px; letter-spacing:0.04em;
  background:transparent; border:1px solid var(--amber); color:var(--amber);
  padding:10px 14px; cursor:pointer; text-transform:uppercase;
  text-decoration:none; display:inline-block;
}
button:hover, .filebtn:hover, .btn:hover{ background:rgba(242,165,65,0.1); }
button:focus-visible, .filebtn:focus-visible, .btn:focus-visible{ outline:2px solid var(--amber); outline-offset:2px; }
button.ghost, .btn.ghost{ border-color:var(--line); color:var(--paper-dim); }
button.ghost:hover, .btn.ghost:hover{ background:rgba(255,255,255,0.04); }

/* ---------- Tracker: module cards ---------- */
.module{
  border:1px solid var(--line); border-left:3px solid var(--line);
  margin-bottom:14px; background:rgba(255,255,255,0.015);
}
.module.partial{ border-left-color:var(--amber); }
.module.done{ border-left-color:var(--green); }
.module-head{ display:flex; align-items:baseline; gap:12px; padding:14px 16px 8px; }
.module-num{ font-family:var(--mono); color:var(--paper-dim); font-size:14.5px; }
.module-title{ font-weight:700; font-size:17.5px; flex:1; }
.module-frac{ font-family:var(--mono); font-size:13.5px; color:var(--paper-dim); }
.module-blurb{ padding:0 16px 12px; color:var(--paper-dim); font-size:15px; }
.module-bar{ height:3px; background:var(--ink-2); margin:0 16px; }
.module-bar .fill{ height:100%; background:var(--amber); transition:width .35s ease; }
.module.done .module-bar .fill{ background:var(--green); }

.module-links{ display:flex; gap:8px; padding:12px 16px 0; flex-wrap:wrap; }
.module-links a{
  font-family:var(--mono); font-size:12.5px; color:var(--amber);
  text-decoration:none; border:1px solid var(--line); padding:5px 9px;
}
.module-links a:hover{ border-color:var(--amber); }
.module-links .soon{
  font-family:var(--mono); font-size:12.5px; color:var(--paper-dim);
  border:1px dashed var(--line); padding:5px 9px;
}

.tasks{ list-style:none; margin:0; padding:14px 16px 4px; }
.task{ display:flex; align-items:flex-start; gap:10px; padding:6px 0; cursor:pointer; font-size:16px; }
.task input{ position:absolute; opacity:0; width:1px; height:1px; }
.box{
  flex:0 0 18px; width:18px; height:18px; border:1px solid var(--paper-dim); margin-top:2px;
  display:flex; align-items:center; justify-content:center;
  font-family:var(--mono); font-size:13.5px; color:var(--ink);
}
.task input:checked + .box{ background:var(--amber); border-color:var(--amber); }
.task input:checked + .box::after{ content:"✓"; }
.task input:focus-visible + .box{ outline:2px solid var(--amber); outline-offset:2px; }
.task .text{ flex:1; }
.task input:checked ~ .text{ color:var(--paper-dim); text-decoration:line-through; text-decoration-color:var(--line); }

.notes{ padding:4px 16px 16px; }
.notes label{ display:block; font-family:var(--mono); font-size:12.5px; color:var(--paper-dim); margin-bottom:6px; }
.notes textarea{
  width:100%; min-height:54px; background:var(--ink); border:1px solid var(--line); color:var(--paper);
  font-family:var(--sans); font-size:15px; padding:8px 10px; resize:vertical;
}
.notes textarea:focus-visible{ outline:2px solid var(--amber); outline-offset:1px; }

.module.bonus{ border-style:dashed; opacity:0.92; }
.bonus-tag{
  font-family:var(--mono); font-size:11px; color:var(--amber);
  border:1px solid var(--amber); padding:1px 6px;
}

footer.note{
  margin-top:30px; border-top:1px solid var(--line); padding-top:16px;
  color:var(--paper-dim); font-size:14.5px;
}

/* ---------- Worksheet pages ---------- */
.breadcrumb{ margin-bottom:14px; }
.breadcrumb a{ font-family:var(--mono); font-size:13.5px; color:var(--paper-dim); text-decoration:none; }
.breadcrumb a:hover{ color:var(--amber); }
.doc-head{ border-bottom:1px solid var(--line); padding-bottom:20px; margin-bottom:28px; }

.block{ margin-bottom:28px; }
.block h2{
  font-family:var(--mono); font-size:15.5px; letter-spacing:0.06em; color:var(--amber);
  text-transform:uppercase; margin:0 0 12px; border-bottom:1px solid var(--line); padding-bottom:6px;
}
.block p, .block li{ font-size:16.5px; }
.block code{ font-family:var(--mono); background:var(--ink-2); padding:1px 5px; font-size:0.9em; }

.steps{ list-style:none; margin:0; padding:0; counter-reset:step; }
.steps li{ position:relative; padding:10px 0 10px 38px; border-bottom:1px solid var(--line); }
.steps li:last-child{ border-bottom:none; }
.steps li::before{
  counter-increment:step; content:counter(step,decimal-leading-zero);
  position:absolute; left:0; top:8px;
  font-family:var(--mono); font-size:13.5px; color:var(--amber);
  border:1px solid var(--line); width:24px; height:24px;
  display:flex; align-items:center; justify-content:center;
}

.code-block{
  background:var(--ink-2); border:1px solid var(--line);
  padding:14px 16px; overflow-x:auto;
  font-family:var(--mono); font-size:14.5px; color:var(--paper);
  white-space:pre;
}
.code-block .out{ color:var(--green); }

.callout{ border:1px solid var(--line); border-left:3px solid var(--amber); padding:16px; background:rgba(255,255,255,0.02); }
.challenge{ border:1px dashed var(--line); padding:16px; }
.challenge h2{ color:var(--green); }

.doc-foot{
  border-top:1px solid var(--line); padding-top:20px; margin-top:36px;
  display:flex; flex-wrap:wrap; gap:14px; align-items:center; justify-content:space-between;
}
.doc-foot .actions{ display:flex; gap:10px; flex-wrap:wrap; }
.pager{ display:flex; gap:14px; font-family:var(--mono); font-size:14.5px; flex-wrap:wrap; }
.pager a{ color:var(--amber); text-decoration:none; }
.pager a:hover{ text-decoration:underline; }

@media (max-width:480px){
  .controls{ align-items:stretch; }
  .controls label.field{ flex:1 1 100%; }
  .doc-foot{ flex-direction:column; align-items:flex-start; }
}
@media (prefers-reduced-motion: reduce){
  .minimap .cell .fill, .module-bar .fill{ transition:none; }
}

/* ---------- Print (Strg+P) ---------- */
@media print{
  body{ background:#fff !important; color:#111; background-image:none; }
  .breadcrumb, .doc-foot .btn, .pager, .controls, footer.note,
  .minimap, .overall-row, .module-links{ display:none !important; }
  .doc-head{ border-bottom:1px solid #999; }
  .doc-head .kicker, .kicker{ color:#555; }
  h1{ color:#111; }
  .sub{ color:#444; }
  .block h2{ color:#333; border-bottom:1px solid #ccc; }
  .block code{ background:#f0f0f0; color:#111; }
  .code-block{ background:#f3f3f3; color:#111; border:1px solid #ccc; }
  .code-block .out{ color:#0a7a4a; }
  .callout{ border-color:#ccc; background:#fafafa; }
  .challenge{ border-color:#999; }
  .steps li{ border-bottom:1px solid #ddd; }
  .steps li::before{ color:#333; border-color:#999; }
  a{ color:#111; text-decoration:underline; }
}