:root{
  --bg:#f4f6fb; --panel:#ffffff; --ink:#1f2430; --muted:#6b7280; --line:#e6e9f0;
  --brand:#1f6feb; --brand-d:#1750c0; --ok:#16a34a; --warn:#d97706; --bad:#dc2626;
  --shadow:0 1px 3px rgba(20,30,60,.08),0 4px 16px rgba(20,30,60,.06);
  /* subject category colors */
  --c-Filologiya:#dbeafe;  --c-Filologiya-ink:#1e40af;
  --c-Ijtimoiy:#fef3c7;    --c-Ijtimoiy-ink:#92400e;
  --c-Aniq:#ede9fe;        --c-Aniq-ink:#5b21b6;
  --c-Tabiiy:#dcfce7;      --c-Tabiiy-ink:#166534;
  --c-Amaliy:#ccfbf1;      --c-Amaliy-ink:#0f766e;
  --c-Toʻgarak:#f1f5f9;    --c-Toʻgarak-ink:#475569;
  --c-Boshqa:#f1f5f9;      --c-Boshqa-ink:#475569;
}
*{box-sizing:border-box}
[hidden]{display:none!important}   /* the hidden attribute must always win over display rules */
html,body{margin:0;height:100%}
body{font-family:Inter,system-ui,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--ink);font-size:14px}

/* ---------- topbar ---------- */
.topbar{display:flex;align-items:center;gap:18px;background:var(--panel);border-bottom:1px solid var(--line);
  padding:10px 18px;position:sticky;top:0;z-index:30}
.brand{display:flex;align-items:center;gap:10px}
.logo{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--brand),#3b82f6);
  color:#fff;display:grid;place-items:center;font-weight:700;letter-spacing:.5px}
.brand-title{font-weight:700;font-size:15px;line-height:1}
.brand-sub{color:var(--muted);font-size:12px;margin-top:3px}
.tabs{display:flex;gap:4px;margin-left:8px}
.tab{border:0;background:transparent;padding:8px 14px;border-radius:8px;font:inherit;font-weight:500;color:var(--muted);cursor:pointer}
.tab:hover{background:var(--bg);color:var(--ink)}
.tab.active{background:var(--brand);color:#fff}
.topbar-actions{margin-left:auto;display:flex;align-items:center;gap:8px}
.save-state{font-size:12px;color:var(--ok);font-weight:500}
.save-state.dirty{color:var(--warn)}

.btn{border:1px solid var(--line);background:#fff;padding:8px 12px;border-radius:8px;font:inherit;font-weight:500;cursor:pointer;color:var(--ink)}
.btn:hover{border-color:#c9cfdb}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand-d)}
.btn.ghost{background:transparent}
.btn.sm{padding:5px 9px;font-size:12px}
.btn.danger{color:var(--bad);border-color:#f3c2c2}

/* ---------- layout ---------- */
main{}
.view{display:none}
.view.active{display:block}
section[data-view="editor"].active{display:grid;grid-template-columns:220px 1fr 290px;height:calc(100vh - 59px)}
.sidebar{border-right:1px solid var(--line);background:var(--panel);overflow:auto;padding:10px}
.sidebar-head,.palette-head{font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);padding:6px 6px 10px}
.class-list{display:flex;flex-direction:column;gap:2px}
.class-grp{font-size:11px;color:var(--muted);font-weight:600;margin:8px 6px 3px}
.class-item{display:flex;align-items:center;justify-content:space-between;gap:6px;padding:8px 10px;border-radius:8px;cursor:pointer}
.class-item:hover{background:var(--bg)}
.class-item.active{background:var(--brand);color:#fff}
.class-item .badge{font-size:11px;padding:1px 7px;border-radius:10px;background:#eef1f7;color:var(--muted)}
.class-item.active .badge{background:rgba(255,255,255,.25);color:#fff}
.class-item.done .badge{background:#dcfce7;color:#166534}
.class-item.under .badge{background:#fee2e2;color:#991b1b}

.editor-main{overflow:auto;padding:16px 18px}
.editor-head{display:flex;align-items:baseline;gap:14px;margin-bottom:12px}
.editor-head h2{margin:0;font-size:20px}
.editor-head-meta{color:var(--muted);font-size:13px}

/* ---------- grid ---------- */
.grid{width:100%;border-collapse:separate;border-spacing:0;background:var(--panel);border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
.grid th,.grid td{border-bottom:1px solid var(--line);border-right:1px solid var(--line);padding:0}
.grid th{background:#fafbfe;font-size:12px;color:var(--muted);font-weight:600;padding:10px 8px;text-align:center}
.grid th.tcol{width:78px}
.grid .pcell{width:78px;text-align:center;background:#fafbfe;font-size:12px;color:var(--muted);padding:6px}
.grid .pcell .pn{font-weight:700;color:var(--ink);font-size:13px}
.slot{height:52px;vertical-align:top;cursor:pointer;position:relative;padding:5px 7px!important;transition:background .08s}
.slot:hover{background:#f8faff}
.slot.empty:hover::after{content:"+";position:absolute;inset:0;display:grid;place-items:center;color:#c3cad8;font-size:20px}
.slot .s-name{font-weight:600;font-size:12.5px;line-height:1.15}
.slot .s-teacher{font-size:11px;color:var(--muted);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.slot.conflict{box-shadow:inset 0 0 0 2px var(--bad)}
.slot.no-teacher{box-shadow:inset 0 0 0 2px var(--warn)}
.slot .flag{position:absolute;top:3px;right:4px;font-size:10px}
.breakrow td{background:repeating-linear-gradient(45deg,#f6f7fb,#f6f7fb 8px,#eef1f7 8px,#eef1f7 16px);
  text-align:center;color:var(--muted);font-weight:600;font-size:12px;padding:7px!important;cursor:default}

/* subject color via category */
.sub{display:block;border-radius:6px;padding:4px 6px;height:100%}
.cat-Filologiya{background:var(--c-Filologiya)} .cat-Filologiya .s-name{color:var(--c-Filologiya-ink)}
.cat-Ijtimoiy{background:var(--c-Ijtimoiy)}    .cat-Ijtimoiy .s-name{color:var(--c-Ijtimoiy-ink)}
.cat-Aniq{background:var(--c-Aniq)}            .cat-Aniq .s-name{color:var(--c-Aniq-ink)}
.cat-Tabiiy{background:var(--c-Tabiiy)}        .cat-Tabiiy .s-name{color:var(--c-Tabiiy-ink)}
.cat-Amaliy{background:var(--c-Amaliy)}        .cat-Amaliy .s-name{color:var(--c-Amaliy-ink)}
.cat-Togarak{background:#eef2f7}               .cat-Togarak .s-name{color:#475569}
.cat-Mustaqil{background:#f8fafc;background-image:repeating-linear-gradient(45deg,transparent,transparent 6px,#eef1f7 6px,#eef1f7 7px)} .cat-Mustaqil .s-name{color:#64748b}
.cat-Bilagon{background:#ffe9f1} .cat-Bilagon .s-name{color:#9d265a}
.cat-Boshqa{background:#f1f5f9}
.sub-break{background:repeating-linear-gradient(45deg,#f6f7fb,#f6f7fb 7px,#eef1f7 7px,#eef1f7 14px);text-align:center}
.sub-break .s-name{color:#7a8294;font-weight:600}

/* ---------- palette ---------- */
.palette{border-left:1px solid var(--line);background:var(--panel);overflow:auto;padding:10px}
.palette-head{display:flex;align-items:center;justify-content:space-between}
.palette-hint{font-size:12px;color:var(--muted);padding:0 6px 8px}
.palette-list{display:flex;flex-direction:column;gap:6px}
.chip{display:flex;align-items:center;justify-content:space-between;gap:8px;border:1px solid var(--line);
  border-radius:9px;padding:8px 10px;cursor:pointer;background:#fff;text-align:left;font:inherit;width:100%}
.chip:hover{border-color:#c3cad8}
.chip.active{outline:2px solid var(--brand);border-color:var(--brand)}
.chip .c-name{font-weight:600;font-size:13px}
.chip .c-meta{font-size:11px;color:var(--muted);margin-top:2px}
.chip .c-count{font-size:12px;font-weight:700;padding:2px 8px;border-radius:10px;white-space:nowrap}
.cnt-ok{background:#dcfce7;color:#166534}
.cnt-amber{background:#fef3c7;color:#92400e}
.cnt-bad{background:#fee2e2;color:#991b1b}
.cnt-over{background:#dbeafe;color:#1e40af}
.chip.eraser{justify-content:center;font-weight:600;color:var(--muted);background:#fafbfe}
.chip.eraser.active{outline:2px solid var(--bad);color:var(--bad)}
.palette-divider{font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);font-weight:600;margin:10px 6px 2px}

/* ---------- panels ---------- */
.panel{max-width:1100px;margin:18px auto;background:var(--panel);border-radius:12px;box-shadow:var(--shadow);padding:18px 20px}
.panel-head{display:flex;align-items:baseline;gap:12px;margin-bottom:14px;border-bottom:1px solid var(--line);padding-bottom:12px}
.panel-head h2{margin:0;font-size:18px}
.muted{color:var(--muted)}
table.data{width:100%;border-collapse:collapse}
table.data th,table.data td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);font-size:13px}
table.data th{color:var(--muted);font-weight:600;font-size:12px}
.bar{height:8px;background:#eef1f7;border-radius:5px;overflow:hidden;min-width:90px}
.bar > i{display:block;height:100%;border-radius:5px}
.pill{font-size:11px;font-weight:600;padding:2px 8px;border-radius:10px}
.pill.ok{background:#dcfce7;color:#166534}.pill.bad{background:#fee2e2;color:#991b1b}
.pill.warn{background:#fef3c7;color:#92400e}.pill.info{background:#dbeafe;color:#1e40af}

/* settings */
.assist-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 14px;margin-bottom:14px;background:#f3f7ff;border:1px solid #d8e4fb;border-radius:10px}
.assist-bar .assist-text{font-size:13px;color:var(--ink);margin-right:auto}
.set-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.set-card{border:1px solid var(--line);border-radius:10px;padding:14px}
.set-card h3{margin:0 0 10px;font-size:14px}
.row{display:flex;gap:8px;align-items:center;margin:6px 0}
input,select{font:inherit;padding:7px 9px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
input[type=number]{width:64px}

/* popover */
.popover{position:fixed;z-index:50;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 40px rgba(20,30,60,.18);padding:12px;width:280px}
.popover h4{margin:0 0 8px;font-size:13px}
.popover .pop-row{margin:8px 0}
.popover label{font-size:11px;color:var(--muted);display:block;margin-bottom:3px}
.popover select{width:100%}
.pop-actions{display:flex;gap:8px;margin-top:10px}
.opt-conflict{color:var(--bad)}

/* toast */
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#1f2430;color:#fff;padding:10px 16px;border-radius:10px;z-index:60;box-shadow:var(--shadow);font-size:13px}

/* assignment modal */
.modal-overlay{position:fixed;inset:0;background:rgba(15,22,40,.45);z-index:55;display:flex;align-items:flex-start;justify-content:center;padding:40px 16px;overflow:auto}
.modal-overlay[hidden]{display:none}   /* the hidden attribute must win over display:flex */
.modal{background:#fff;border-radius:14px;box-shadow:0 20px 60px rgba(15,22,40,.3);width:640px;max-width:100%;max-height:86vh;display:flex;flex-direction:column}
.modal-head{display:flex;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--line)}
.modal-head h3{margin:0;font-size:17px}
.modal-head .x{margin-left:auto;border:0;background:transparent;font-size:22px;line-height:1;cursor:pointer;color:var(--muted)}
.modal-sub{padding:10px 20px;background:#f7f9fd;border-bottom:1px solid var(--line);font-size:13px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.modal-body{padding:8px 20px 16px;overflow:auto}
.assign-row{display:grid;grid-template-columns:1.3fr 46px 1.6fr;gap:10px;align-items:center;padding:8px 0;border-bottom:1px solid var(--line)}
.assign-row .a-sub{font-weight:600;font-size:13px}
.assign-row .a-sub .a-cat{display:block;font-weight:400;font-size:11px;color:var(--muted)}
.assign-row .a-cnt{font-size:12px;color:var(--muted);text-align:center}
.assign-row select{width:100%}
.assign-row.unset select{border-color:#f0c000;background:#fffdf2}
.assign-row .opt-busy{color:var(--bad)}
.modal-foot{padding:12px 20px;border-top:1px solid var(--line);display:flex;gap:10px;align-items:center}
.assign-warn{color:var(--bad);font-size:12px}

/* print controls */
.print-controls{display:flex;gap:14px;align-items:flex-end;flex-wrap:wrap}
.print-controls label{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--muted)}
.print-area{max-width:1100px;margin:14px auto;display:flex;flex-direction:column;gap:18px}

/* printable timetable card */
.tt-card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:var(--shadow)}
.tt-card .tt-head{display:flex;justify-content:space-between;align-items:flex-end;border-bottom:2px solid var(--ink);padding-bottom:8px;margin-bottom:10px}
.tt-card .tt-title{font-size:18px;font-weight:700}
.tt-card .tt-sub{color:var(--muted);font-size:12px}
table.tt{width:100%;border-collapse:collapse}
table.tt th,table.tt td{border:1px solid #cbd2e0;padding:5px 6px;font-size:11.5px;vertical-align:top}
table.tt th{background:#f3f5fb;font-weight:600}
table.tt td .tt-sname{font-weight:600}
table.tt td .tt-steacher{color:#555;font-size:10.5px}
table.tt .tt-break td{background:#f6f7fb;text-align:center;color:#777;font-weight:600}

@media print{
  .no-print{display:none!important}
  body{background:#fff}
  section[data-view="print"].active{display:block}
  .print-area{margin:0;gap:0}
  .tt-card{border:0;box-shadow:none;border-radius:0;padding:0;page-break-after:always}
  .tt-card:last-child{page-break-after:auto}
}