:root{
    --paper:#FAF8F3;
    --panel:#F1EEE4;
    --ink:#1E2430;
    --ink-soft:#5B6472;
    --line:#DCD7C9;
    --line-strong:#B9B2A0;
    --teal:#2F6F6D;
    --teal-dark:#204E4C;
    --amber:#B9791C;
    --amber-bg:#FBF0DC;
    --red:#A73A3A;
    --red-bg:#FBE7E5;
    --white:#FFFFFF;
    --radius:3px;
  }
  *{box-sizing:border-box;}
  html,body{margin:0;padding:0;}
  body{
    background:var(--paper);
    color:var(--ink);
    font-family:'IBM Plex Sans',sans-serif;
    font-size:14.5px;
    line-height:1.5;
  }
  h1,h2,h3{
    font-family:'Source Serif 4',serif;
    font-weight:600;
    margin:0 0 4px 0;
    color:var(--ink);
  }
  .mono{font-family:'IBM Plex Mono',monospace;}
  a{color:var(--teal-dark);}
  button, select, input, textarea{
    font-family:inherit;
    font-size:14px;
  }
  .app{
    display:grid;
    grid-template-columns:230px 1fr;
    min-height:100vh;
  }
  /* Sidebar */
  .sidebar{
    background:var(--panel);
    border-right:1px solid var(--line-strong);
    padding:22px 0 22px 0;
    display:flex;
    flex-direction:column;
  }
  .brand{
    padding:0 20px 18px 20px;
    border-bottom:1px solid var(--line);
    margin-bottom:14px;
  }
  .brand .mark{
    width:30px;height:30px;
    border:1.5px solid var(--ink);
    display:flex;align-items:center;justify-content:center;
    font-family:'Source Serif 4',serif;font-weight:700;font-size:16px;
    margin-bottom:8px;
  }
  .brand h1{font-size:18px;line-height:1.25;}
  .brand .dept-name{font-size:12.5px;color:var(--ink-soft);margin-top:3px;}
  .nav-group{padding:0 12px;margin-bottom:18px;}
  .nav-group-label{
    font-size:11.5px;
    color:var(--ink-soft);
    padding:0 8px 6px 8px;
    letter-spacing:0.02em;
  }
  .nav-item{
    display:flex;align-items:center;justify-content:space-between;
    padding:7px 8px;
    border-radius:var(--radius);
    color:var(--ink);
    text-decoration:none;
    cursor:pointer;
    font-size:14px;
    border-left:2px solid transparent;
    transition:background-color .15s ease, border-color .15s ease;
  }
  .nav-item:hover{background:rgba(0,0,0,0.04);}
  .nav-item.active{
    background:var(--white);
    border-left:2px solid var(--teal);
    font-weight:500;
  }
  .badge{
    font-family:'IBM Plex Mono',monospace;
    font-size:11px;
    background:var(--amber-bg);
    color:var(--amber);
    border-radius:8px;
    padding:1px 7px;
  }
  .badge.zero{background:transparent;color:var(--ink-soft);}
  /* Main */
  .main{padding:32px 40px 60px 40px;max-width:1180px;}
  .page{display:none;}
  .page.active{display:block;}
  .page-head{margin-bottom:22px;}
  .page-head p.desc{color:var(--ink-soft);margin:6px 0 0 0;max-width:640px;}
  /* Panels & tables */
  .panel{
    background:var(--white);
    border:1px solid var(--line-strong);
    border-radius:var(--radius);
    padding:20px;
    margin-bottom:22px;
  }
  .panel h2{font-size:16px;margin-bottom:14px;}
  .field-row{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:12px;}
  .field{display:flex;flex-direction:column;gap:4px;flex:1;min-width:150px;}
  .field label{font-size:12.5px;color:var(--ink-soft);}
  .field input[type=text], .field input[type=number], .field select, .field input[type=date]{
    border:1px solid var(--line-strong);
    background:var(--paper);
    border-radius:var(--radius);
    padding:7px 9px;
    color:var(--ink);
  }
  .field input:focus, .field select:focus, .field textarea:focus{outline:2px solid var(--teal);outline-offset:1px;}
  .days-check{display:flex;gap:10px;flex-wrap:wrap;}
  .days-check label{
    display:flex;align-items:center;gap:5px;
    font-size:13px;border:1px solid var(--line-strong);
    padding:5px 9px;border-radius:12px;background:var(--paper);cursor:pointer;
  }
  .days-check input{margin:0;}
  .btn{
    border:1px solid var(--ink);
    background:var(--ink);
    color:var(--white);
    padding:8px 16px;
    border-radius:var(--radius);
    cursor:pointer;
    transition:background-color .15s ease, border-color .15s ease, transform .08s ease;
  }
  .btn:hover{background:var(--teal-dark);border-color:var(--teal-dark);}
  .btn:active{transform:translateY(1px);}
  .btn.secondary{
    background:var(--white);color:var(--ink);border:1px solid var(--line-strong);
  }
  .btn.secondary:hover{border-color:var(--ink);}
  .btn.danger{background:var(--white);color:var(--red);border:1px solid var(--red);}
  .btn.danger:hover{background:var(--red-bg);}
  .btn:disabled{opacity:0.45;cursor:not-allowed;}
  .btn:disabled:active{transform:none;}
  .btn:focus-visible, .link-btn:focus-visible, .nav-item:focus-visible{
    outline:2px solid var(--teal);outline-offset:2px;
  }
  table.list{width:100%;border-collapse:collapse;font-size:13.5px;}
  table.list th{
    text-align:left;font-weight:500;color:var(--ink-soft);
    border-bottom:1px solid var(--line-strong);padding:6px 8px;font-size:12.5px;
  }
  table.list td{padding:8px;border-bottom:1px solid var(--line);vertical-align:top;transition:background-color .1s ease;}
  table.list tr:last-child td{border-bottom:none;}
  table.list tr:hover td{background:rgba(47,111,109,0.045);}
  .row-actions{display:flex;gap:6px;}
  .link-btn{
    background:none;border:none;color:var(--teal-dark);cursor:pointer;
    padding:2px 4px;font-size:13px;text-decoration:underline;
    transition:opacity .12s ease;
  }
  .link-btn:hover{opacity:0.7;}
  .link-btn.remove{color:var(--red);}
  .empty-note{color:var(--ink-soft);font-style:italic;font-size:13.5px;padding:10px 2px;}
  .swatch{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:6px;vertical-align:middle;}
  .pill{display:inline-block;font-size:11.5px;border:1px solid var(--line-strong);border-radius:10px;padding:1px 8px;color:var(--ink-soft);}
  /* Generate page */
  .gen-actions{display:flex;gap:10px;align-items:center;margin-bottom:8px;}
  .gen-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0;}
  .stat{border:1px solid var(--line-strong);border-left:3px solid var(--line-strong);border-radius:var(--radius);padding:14px;background:var(--white);}
  .stat .num{font-family:'Source Serif 4',serif;font-size:26px;}
  .stat .label{font-size:12.5px;color:var(--ink-soft);margin-top:2px;}
  /* Left edge echoes the same teal/ink/amber/red language used on the
     timetable's own cell types, so the summary reads as a legend for it. */
  .stat.stat-good{border-left-color:var(--teal);}
  .stat.stat-neutral{border-left-color:var(--ink);}
  .stat.stat-warn{border-left-color:var(--amber);}
  .stat.stat-bad{border-left-color:var(--red);}
  /* Timetable grid */
  .view-switch{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap;}
  .view-switch select{border:1px solid var(--line-strong);border-radius:var(--radius);padding:7px 9px;background:var(--paper);}
  .grid-wrap{overflow-x:auto;border:1px solid var(--line-strong);border-radius:var(--radius);}
  table.timetable{border-collapse:collapse;width:100%;min-width:760px;}
  table.timetable th{
    background:var(--panel);border:1px solid var(--line);
    padding:8px 6px;font-size:12.5px;font-weight:500;color:var(--ink-soft);
    text-align:center;
  }
  table.timetable td{
    border:1px solid var(--line);
    padding:6px;vertical-align:top;height:52px;
    font-size:12.5px;
  }
  table.timetable td.hourcol{
    background:var(--panel);text-align:right;color:var(--ink-soft);
    font-family:'IBM Plex Mono',monospace;font-size:11.5px;white-space:nowrap;
    width:70px;
  }
  .cell-block{
    border-radius:2px;padding:5px 6px;height:100%;
    border-left:3px solid var(--teal);
    background:#EAF2F1;
  }
  .cell-block .subj{font-weight:600;font-size:12.5px;}
  .cell-block .meta{color:var(--ink-soft);font-size:11px;margin-top:2px;}
  .cell-block.fixed{border-left-color:var(--ink);background:var(--panel);}
  .cell-block.violation{border-left-color:var(--amber);background:var(--amber-bg);}
  .cell-block.lunch{
    border-left-color:var(--line-strong);
    background:repeating-linear-gradient(45deg,var(--panel),var(--panel) 6px,#E8E4D6 6px,#E8E4D6 12px);
    color:var(--ink-soft);display:flex;align-items:center;justify-content:center;
  }
  .cell-block.lunch .subj{font-weight:500;font-size:11.5px;color:var(--ink-soft);}
  .cell-block.sl{
    border-left-color:var(--line-strong);border-left-style:dashed;
    background:var(--panel);color:var(--ink-soft);
  }
  .cell-block.sl .subj{font-weight:600;font-size:12px;letter-spacing:0.04em;color:var(--ink-soft);}
  .cell-empty{color:var(--line-strong);font-size:11px;}
  .cell-block-group{display:flex;flex-direction:column;gap:4px;height:100%;}
  .cell-block-group .cell-block{flex:1;}
  .batch-tag{
    display:inline-block;font-size:10px;font-weight:700;color:var(--teal-dark);
    background:var(--white);border:1px solid var(--teal);border-radius:2px;
    padding:0 4px;margin-left:4px;vertical-align:middle;
  }
  .hint{color:var(--ink-soft);font-size:12px;margin:6px 0 12px;}
  /* Violations */
  .viol-item{
    border:1px solid var(--line);border-left:3px solid var(--amber);
    background:var(--amber-bg);padding:10px 12px;border-radius:var(--radius);
    margin-bottom:8px;font-size:13.5px;
  }
  .viol-item.hard{border-left-color:var(--red);background:var(--red-bg);}
  .viol-item .tag{font-size:11px;color:var(--ink-soft);text-transform:none;margin-bottom:2px;}
  /* Print page */
  #printArea{display:none;}
  .print-year-block{margin-bottom:34px;}
  .helptext{font-size:12.5px;color:var(--ink-soft);margin-top:10px;line-height:1.55;}
  .inline-note{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;font-size:13px;color:var(--ink-soft);margin-bottom:18px;}
  /* Info & help page */
  .info-item{padding:14px 0;border-bottom:1px solid var(--line);}
  .info-item:first-child{padding-top:0;}
  .info-item:last-child{border-bottom:none;padding-bottom:0;}
  .info-item h3{font-size:14px;margin-bottom:4px;}
  .info-item p{margin:0;color:var(--ink-soft);font-size:13.5px;line-height:1.6;max-width:640px;}
  textarea.jsonbox{
    width:100%;min-height:140px;border:1px solid var(--line-strong);background:var(--paper);
    border-radius:var(--radius);padding:10px;font-family:'IBM Plex Mono',monospace;font-size:12.5px;
  }
  /* Toast: same panel/border language as the rest of the app, just floated */
  #toastHost{
    position:fixed; left:50%; bottom:24px; transform:translateX(-50%);
    z-index:50; display:flex; flex-direction:column; gap:8px; align-items:center;
    pointer-events:none;
  }
  .toast{
    background:var(--panel); border:1px solid var(--line-strong); border-left:3px solid var(--teal);
    color:var(--ink); border-radius:var(--radius); padding:9px 16px; font-size:13px;
    box-shadow:0 2px 10px rgba(30,36,48,0.12);
    opacity:0; transform:translateY(6px); transition:opacity .18s ease, transform .18s ease;
  }
  .toast.show{opacity:1; transform:translateY(0);}
  @media print{
    .app{display:none !important;}
    #printArea{display:block !important;}
    #toastHost{display:none !important;}
    body{background:#fff;}
    table.timetable td, table.timetable th{font-size:11px;padding:4px;}
  }
  @media (max-width: 780px){
    .app{grid-template-columns:1fr;}
    .sidebar{flex-direction:row;flex-wrap:wrap;position:sticky;top:0;z-index:5;padding:10px;}
    .brand{display:none;}
    .nav-group{padding:0 4px;margin-bottom:6px;}
    .main{padding:20px;}
    .gen-summary{grid-template-columns:repeat(2,1fr);}
  }