/* =====================================================================
   SHARED · course homework pages (weekN-homework.html).
   Every rule here was byte-identical in all 10 OMBA401 and OMBAFR455
   pages of this type before extraction — it is what they already had in
   common, not a redesign. Load it after a theme:

     <link rel="stylesheet" href="/shared/themes/sumas.css">
     <link rel="stylesheet" href="/shared/homework.css">

   Lesson and homework pages deliberately have SEPARATE stylesheets: they
   give the same selectors different values (body line-height, h1 size,
   .wrap padding), so merging them would make one silently override the
   other. Do not combine these files.

   The theme supplies every custom property used below. A page's own
   <style> comes last and still wins — keep only page-unique rules there.

   KNOWN WART: a few rules still carry literal rgba() tints of the SUMAS
   palette instead of a variable. They are faint (~10% alpha) borders and
   hovers, left as-is so this extraction was provably behaviour-identical.
   A non-SUMAS theme should override them.
   ===================================================================== */

*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent;}
body{font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;color:var(--ink);line-height:1.6; background:var(--sand);min-height:100vh;padding-bottom:90px;-webkit-font-smoothing:antialiased;}
h1,h2,h3{font-family:Georgia,'Times New Roman',serif;}
.topbar{position:sticky;top:0;z-index:60;background:rgba(244,237,224,0.92);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line);padding:9px 16px;}
.topbar-inner{max-width:820px;margin:0 auto;display:flex;align-items:center;gap:12px;}
.topbar .course{font-size:10px;letter-spacing:2px;color:var(--green);font-weight:700;white-space:nowrap;}
.filterbtn{font-size:12px;font-weight:bold;color:var(--green-deep);background:transparent;border:1px solid rgba(74,139,58,0.45);border-radius:20px;padding:5px 12px;cursor:pointer;flex:none;}
.filterbtn:hover{background:var(--green-pale);}
body.hide-solved .prob.solved{display:none;}
.scorechip{margin-left:auto;font-size:12px;color:var(--green-deep);font-weight:bold;background:var(--green-pale);border:1px solid rgba(74,139,58,0.35);border-radius:20px;padding:5px 12px;}
.pop{font-size:13px;color:var(--green-deep);text-decoration:none;font-weight:700;opacity:.7;}
.pop:hover{opacity:1;}
.wrap{max-width:820px;margin:0 auto;padding:24px 18px;}
.hero{text-align:center;margin-bottom:8px;}
.eyebrow{font-size:11px;letter-spacing:4px;color:var(--green);font-weight:700;text-transform:uppercase;}
.hero h1{font-size:clamp(26px,5vw,38px);margin:12px 0 8px;color:var(--ink);letter-spacing:-.5px;}
.hero h1 em{font-style:italic;color:var(--green);}
.hero p{color:var(--ink-soft);max-width:62ch;margin:0 auto;font-size:15px;}
.hero p b{color:var(--ink);}
.rules{background:var(--white);border:1px solid var(--sand-deep);border-radius:16px;padding:16px 20px;margin:20px 0 0;box-shadow:var(--shadow);font-size:13.5px;color:var(--ink-soft);}
.rules b{color:var(--green-deep);}
.databox{background:var(--white);border:1.5px dashed var(--gold);border-radius:16px;padding:16px 18px;margin:22px 0;}
.databox h4{font-family:Georgia,serif;color:var(--gold-soft);font-size:14px;margin-bottom:6px;}
.databox p{font-size:13px;color:var(--grey);margin-top:6px;}
.part-head{font-size:12px;letter-spacing:2px;color:var(--green);font-weight:bold;text-transform:uppercase;margin:34px 0 4px;border-top:1px solid var(--line);padding-top:20px;}
.part-sub{color:var(--grey);font-size:13px;margin-bottom:12px;}
.prob{background:var(--white);border:1px solid var(--sand-deep);border-radius:16px;padding:18px 20px;margin-bottom:14px;transition:.2s;box-shadow:var(--shadow);}
.prob.solved{border-color:var(--green);border-width:1.5px;}
.prob .pnum{font-family:Georgia,serif;font-size:13px;color:var(--green-deep);font-weight:bold;}
.prob .pts{float:right;font-size:11px;color:var(--grey);}
.prob .q{font-size:15px;color:var(--ink-soft);margin:8px 0 14px;}
.prob .q b{color:var(--ink);}
.prob .q em{color:var(--green-deep);font-style:normal;font-weight:bold;}
.fields{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;}
.field{display:flex;flex-direction:column;gap:4px;}
.field label{font-size:12px;color:var(--grey);}
.field .inwrap{display:flex;align-items:center;gap:6px;}
.field input:focus{outline:none;border-color:var(--green);}
.field input.ok{border-color:var(--ok);background:rgba(74,139,58,0.08);}
.field input.no{border-color:var(--no);background:rgba(179,64,42,0.06);}
.field .unit{color:var(--grey);font-size:13px;}
.field .mark{font-size:16px;width:18px;}
.opts{display:flex;flex-direction:column;gap:8px;}
.opt{text-align:left;background:var(--sand);border:1px solid var(--sand-deep);border-radius:10px;padding:10px 13px;color:var(--ink-soft);font:14px 'Helvetica Neue',Arial,sans-serif;cursor:pointer;transition:.15s;}
.opt:hover{border-color:var(--green);}
.opt.sel{border-color:var(--green);background:var(--green-pale);}
.opt.ok{border-color:var(--ok);background:rgba(74,139,58,0.14);color:var(--green-deep);font-weight:700;}
.opt.no{border-color:var(--no);background:rgba(179,64,42,0.08);color:var(--no);}
.btns{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px;}
.btn{background:var(--green);color:#fff;border:none;padding:9px 18px;font:bold 12px 'Helvetica Neue',Arial,sans-serif;letter-spacing:.5px;cursor:pointer;border-radius:30px;transition:.2s;}
.btn:hover{background:var(--green-deep);}
.btn.ghost{background:transparent;color:var(--green-deep);border:1.5px solid var(--green);}
.btn.ghost:hover{background:var(--green-pale);}
.btn.dim{background:transparent;color:var(--grey);border:1px solid var(--sand-deep);}
.btn.dim:hover{color:var(--ink);border-color:var(--grey);}
.btn.locked{opacity:.45;}
.fb{margin-top:12px;font-size:14px;display:none;border-radius:10px;padding:11px 14px;line-height:1.5;}
.fb.show{display:block;animation:fade .25s;}
@keyframes fade{from{opacity:0}to{opacity:1}}
.fb.good{background:rgba(74,139,58,0.1);border:1px solid rgba(74,139,58,0.45);color:var(--green-deep);}
.fb.bad{background:rgba(179,64,42,0.07);border:1px solid rgba(179,64,42,0.35);color:var(--terra);}
.fb.hint{background:var(--green-pale);border:1px solid rgba(74,139,58,0.3);color:var(--ink-soft);}
.fb.sol{background:rgba(91,61,184,0.06);border:1px solid rgba(91,61,184,0.3);color:var(--ink-soft);}
.fb.sol b{color:var(--ink);}
.finish{text-align:center;margin:30px 0 6px;}
.finish .res{font-family:Georgia,serif;font-size:22px;color:var(--green-deep);margin-bottom:12px;min-height:28px;}
.foot{text-align:center;color:var(--grey);font-size:12px;margin-top:30px;}
.foot a{color:var(--green-deep);text-decoration:none;font-weight:600;}
.backlink{display:inline-block;margin-top:12px;border:1.5px solid var(--green);border-radius:30px;padding:6px 14px;}
.backlink:hover{background:var(--green-pale);}