:root{
  --navy:#1B2A4A;--navy-2:#24365e;--navy-3:#2f4677;--accent:#14A38B;--accent-2:#0f8a75;
  --bg:#F4F6FA;--card:#fff;--line:#E3E8F0;--text:#1d2433;--muted:#5d6b82;--faint:#8a96aa;
  --red:#D64545;--red-bg:#fdecec;--orange:#E08A1E;--orange-bg:#fdf3e4;--green:#1E9E62;--green-bg:#e6f6ee;--blue:#2F6FDE;--blue-bg:#e9f0fd;
  --radius:10px;--shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.08);
  --font:"Inter","Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:var(--font);font-size:14px;color:var(--text);background:var(--bg);line-height:1.45}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0 0 .5rem;line-height:1.25;color:var(--navy)}
h1{font-size:22px}h2{font-size:18px}h3{font-size:15px}h4{font-size:14px}
small,.muted{color:var(--muted)}
code{background:#eef1f6;padding:1px 5px;border-radius:4px;font-size:12px}

/* layout */
.shell{display:flex;min-height:100vh}
.sidebar{width:248px;flex:0 0 248px;background:var(--navy);color:#cfd8ea;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto;transition:width .2s}
.sidebar .brand{display:flex;align-items:center;gap:10px;padding:18px 18px 14px;color:#fff;font-weight:700;font-size:15px;border-bottom:1px solid rgba(255,255,255,.08)}
.sidebar .brand img{width:32px;height:32px;border-radius:6px;object-fit:cover;background:#fff}
.sidebar .brand .logo{width:32px;height:32px;border-radius:8px;background:var(--accent);display:grid;place-items:center;color:#fff;font-weight:800}
.sidebar nav{padding:10px 8px 24px}
.sidebar nav a{display:flex;align-items:center;gap:10px;padding:8px 12px;border-radius:8px;color:#cfd8ea;font-size:13.5px;margin:1px 0}
.sidebar nav a:hover{background:var(--navy-2);color:#fff;text-decoration:none}
.sidebar nav a.active{background:var(--accent);color:#fff}
.sidebar nav a .ico{width:18px;text-align:center;opacity:.9;font-size:13px}
.sidebar .who{margin-top:auto;padding:14px 18px;border-top:1px solid rgba(255,255,255,.08);font-size:12px}
.shell.collapsed .sidebar{width:64px;flex-basis:64px}
.shell.collapsed .sidebar .label,.shell.collapsed .sidebar .brand span,.shell.collapsed .sidebar .who{display:none}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{height:58px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px;padding:0 20px;position:sticky;top:0;z-index:20}
.topbar .burger{background:none;border:0;font-size:20px;cursor:pointer;color:var(--navy)}
.topbar form.search{flex:1;max-width:420px}
.topbar form.search input{width:100%;border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:8px 12px}
.topbar .icons{margin-left:auto;display:flex;gap:6px;align-items:center}
.topbar .icon-btn{position:relative;display:inline-grid;place-items:center;width:36px;height:36px;border-radius:8px;color:var(--navy);font-size:16px}
.topbar .icon-btn:hover{background:var(--bg);text-decoration:none}
.topbar .dot{position:absolute;top:4px;right:4px;background:var(--red);color:#fff;border-radius:9px;font-size:10px;min-width:16px;height:16px;display:grid;place-items:center;padding:0 3px}
.topbar .user{display:flex;align-items:center;gap:8px;padding:4px 8px;border-radius:8px;color:var(--text)}
.avatar{width:32px;height:32px;border-radius:50%;background:var(--navy-3);color:#fff;display:grid;place-items:center;font-weight:700;font-size:12px}
.content{padding:22px 24px 48px;max-width:1440px;width:100%}
.page-head{display:flex;align-items:flex-start;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.page-head .title{flex:1;min-width:240px}
.page-head .title p{margin:.15rem 0 0;color:var(--muted)}
.breadcrumbs{font-size:12px;color:var(--faint);margin-bottom:4px}
.breadcrumbs a{color:var(--faint)}

/* cards & grids */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin-bottom:18px}
.card>h2,.card>h3{display:flex;align-items:center;gap:8px}
.card .card-head{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.card .card-head h2,.card .card-head h3{margin:0;flex:1}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px;margin-bottom:18px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow)}
.stat .label{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}
.stat .value{font-size:22px;font-weight:700;color:var(--navy);margin-top:4px}
.stat .sub{font-size:12px;color:var(--faint)}
.stat.good .value{color:var(--green)}.stat.warn .value{color:var(--orange)}.stat.bad .value{color:var(--red)}

/* tables */
.table-wrap{overflow-x:auto}
table.t{width:100%;border-collapse:collapse;font-size:13.5px}
table.t th{text-align:left;font-weight:600;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.03em;padding:9px 10px;border-bottom:1px solid var(--line);background:#fafbfd;white-space:nowrap}
table.t td{padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}
table.t tr:hover td{background:#fafcff}
table.t td.num,table.t th.num{text-align:right;font-variant-numeric:tabular-nums}
table.t.compact td,table.t.compact th{padding:5px 8px}
.empty{padding:28px;text-align:center;color:var(--muted)}

/* badges */
.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:11.5px;font-weight:600;background:#eef1f6;color:var(--muted);white-space:nowrap}
.badge.green{background:var(--green-bg);color:var(--green)}.badge.red{background:var(--red-bg);color:var(--red)}
.badge.orange{background:var(--orange-bg);color:var(--orange)}.badge.blue{background:var(--blue-bg);color:var(--blue)}
.badge.navy{background:var(--navy);color:#fff}

/* buttons & forms */
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;color:var(--text);padding:7px 13px;border-radius:8px;font-size:13.5px;font-weight:500;cursor:pointer;text-decoration:none;white-space:nowrap}
.btn:hover{background:#f6f8fb;text-decoration:none}
.btn.primary{background:var(--navy);border-color:var(--navy);color:#fff}.btn.primary:hover{background:var(--navy-2)}
.btn.accent{background:var(--accent);border-color:var(--accent);color:#fff}.btn.accent:hover{background:var(--accent-2)}
.btn.danger{background:#fff;border-color:#f0c4c4;color:var(--red)}.btn.danger:hover{background:var(--red-bg)}
.btn.sm{padding:4px 9px;font-size:12.5px}
.btn-row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
form .field{margin-bottom:14px}
form label{display:block;font-weight:600;font-size:13px;margin-bottom:5px;color:var(--text)}
form .help{font-size:12px;color:var(--faint);margin-top:3px}
form .errorlist{list-style:none;margin:4px 0 0;padding:0;color:var(--red);font-size:12.5px}
input[type=text],input[type=email],input[type=number],input[type=password],input[type=date],input[type=time],input[type=datetime-local],input[type=url],input[type=tel],select,textarea{
  width:100%;border:1px solid #cfd6e2;border-radius:8px;padding:8px 10px;font:inherit;background:#fff;color:var(--text)}
input:focus,select:focus,textarea:focus{outline:2px solid rgba(20,163,139,.25);border-color:var(--accent)}
textarea{min-height:80px}
select[multiple]{min-height:120px}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px}
.form-grid .wide{grid-column:1/-1}
.inline-form{display:flex;gap:8px;align-items:flex-end;flex-wrap:wrap}
.inline-form .field{margin:0}
.filters{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.filters input,.filters select{width:auto;min-width:160px}
input.cell{width:80px;padding:5px 6px;text-align:right}
input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent)}

/* messages */
.messages{list-style:none;padding:0;margin:0 0 16px}
.messages li{padding:10px 14px;border-radius:8px;margin-bottom:8px;border:1px solid}
.messages .success{background:var(--green-bg);border-color:#bfe6d2;color:#11663f}
.messages .error{background:var(--red-bg);border-color:#f3c5c5;color:#9b2c2c}
.messages .warning{background:var(--orange-bg);border-color:#f2d7ae;color:#8a5208}
.messages .info{background:var(--blue-bg);border-color:#c9dafb;color:#1f4fa8}
.callout{padding:12px 14px;border-radius:8px;background:var(--blue-bg);color:#1f4fa8;margin-bottom:14px}
.callout.warn{background:var(--orange-bg);color:#8a5208}.callout.bad{background:var(--red-bg);color:#9b2c2c}.callout.good{background:var(--green-bg);color:#11663f}

/* tabs */
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:16px;overflow-x:auto}
.tabs a{padding:9px 14px;color:var(--muted);border-bottom:2px solid transparent;white-space:nowrap}
.tabs a.active{color:var(--navy);border-bottom-color:var(--accent);font-weight:600}
.tabs a:hover{text-decoration:none;color:var(--navy)}

/* timetable grid */
.tt{border-collapse:collapse;width:100%;table-layout:fixed;font-size:12.5px}
.tt th{background:#fafbfd;color:var(--muted);font-weight:600;padding:6px;border:1px solid var(--line)}
.tt td{border:1px solid var(--line);padding:4px;height:58px;vertical-align:top}
.tt .lesson{border-radius:6px;padding:4px 6px;background:var(--blue-bg);border-left:3px solid var(--blue);height:100%}
.tt .lesson b{display:block;color:var(--navy)}
.tt .lesson.locked{border-left-color:var(--orange)}
.tt .lesson.cover{background:var(--orange-bg);border-left-color:var(--orange)}
.tt td.break{background:repeating-linear-gradient(45deg,#f6f7fa,#f6f7fa 6px,#eef0f4 6px,#eef0f4 12px);color:var(--faint);text-align:center;vertical-align:middle;height:24px}

/* kpi + optimization */
.kpis{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:10px}
.kpi{border:1px solid var(--line);border-radius:8px;padding:10px 12px;background:#fbfcfe}
.kpi .k{font-size:11.5px;color:var(--muted);text-transform:capitalize}
.kpi .v{font-size:18px;font-weight:700;color:var(--navy)}
.progress{height:8px;background:#e8ecf3;border-radius:6px;overflow:hidden}
.progress>div{height:100%;background:var(--accent);transition:width .5s}
.weights{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px 18px}
.weights input[type=range]{width:100%}
.opt-card{display:flex;flex-direction:column;gap:6px}
.opt-card p{margin:0;color:var(--muted);font-size:13px;flex:1}
.bar{height:10px;background:#e8ecf3;border-radius:6px;overflow:hidden}.bar>i{display:block;height:100%;background:var(--navy-3)}

/* report / print */
.print-only{display:none}
@media print{
  .sidebar,.topbar,.no-print,.btn,.page-head .btn-row{display:none!important}
  .content{padding:0}.card{box-shadow:none;border:0;padding:0}
  .print-only{display:block}
  body{background:#fff}
}

/* auth */
.auth{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,var(--navy),#20406e)}
.auth .box{width:min(400px,92vw);background:#fff;border-radius:14px;padding:28px;box-shadow:0 10px 40px rgba(0,0,0,.25)}
.auth .box h1{text-align:center}
.public{max-width:900px;margin:0 auto;padding:24px}

/* responsive */
@media (max-width:1100px){.g4{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:820px){
  .sidebar{position:fixed;left:-260px;z-index:40;height:100vh;transition:left .2s}
  .shell.open .sidebar{left:0}
  .shell.collapsed .sidebar{width:248px}
  .g2,.g3,.g4,.form-grid{grid-template-columns:1fr}
  .content{padding:16px 12px 40px}
  .topbar form.search{display:none}
  .topbar .user span{display:none}
  table.t{font-size:13px}
  .tt{font-size:11px}
}
input[type=range]{accent-color:var(--accent)}

/* parent app banner */
.app-banner{display:flex;flex-wrap:wrap;gap:8px;align-items:center;background:var(--blue-bg);border:1px solid #c9dafb;color:var(--navy);padding:10px 14px;border-radius:var(--radius);margin-bottom:14px}
.app-banner[hidden]{display:none}
@media (display-mode: standalone){.topbar{padding-top:env(safe-area-inset-top)}}