:root{
  --ink:#1B2A4A;
  --ink-2:#233457;
  --paper:#FDFBF6;
  --paper-2:#F6F1E7;
  --slate:#5B6472;
  --slate-light:#8A93A3;
  --bronze:#9C7A3C;
  --bronze-light:#C6A55C;
  --line:#DCD5C4;
  --line-soft:#E9E4D8;
  --good:#3F6B4F;
  --bad:#A6423A;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --serif: Georgia, "Times New Roman", "Liberation Serif", serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  font-family:var(--sans);
  background:var(--ink);
  color:var(--ink-2);
  min-height:100vh;
}
#shell{display:flex;min-height:100vh;}

/* ---------- Sidebar ---------- */
#sidebar{
  width:250px;flex:none;background:var(--ink);color:var(--paper);
  padding:26px 18px;display:flex;flex-direction:column;gap:4px;
}
.brand{
  display:flex;align-items:center;gap:12px;
  font-family:var(--serif);font-size:16px;line-height:1.25;color:var(--paper);
  padding:0 10px 22px 10px;border-bottom:1px solid rgba(253,251,246,0.15);margin-bottom:18px;
}
.brand-logo{width:44px;height:44px;object-fit:contain;flex:none;background:#fff;border-radius:8px;padding:3px;}
.brand small{display:block;font-family:var(--sans);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--bronze-light);margin-top:6px;}
.nav-item{
  display:flex;align-items:center;gap:10px;padding:11px 12px;border-radius:6px;cursor:pointer;
  font-size:14px;color:#C9D0DE;border:1px solid transparent;text-decoration:none;
}
.nav-item .n{font-family:var(--mono);font-size:11px;color:var(--bronze-light);width:16px;}
.nav-item:hover{background:rgba(255,255,255,0.06);color:var(--paper);}
.nav-item.active{background:rgba(255,255,255,0.1);color:var(--paper);border-color:rgba(255,255,255,0.12);}
.nav-sep{height:1px;background:rgba(255,255,255,0.12);margin:14px 10px;}
.nav-foot{margin-top:auto;padding:10px;font-size:11.5px;color:#8996AC;line-height:1.5;}
.nav-foot button{
  width:100%;margin-top:8px;background:transparent;border:1px solid rgba(255,255,255,0.2);color:#C9D0DE;
  padding:8px 10px;border-radius:6px;font-size:12.5px;cursor:pointer;font-family:var(--sans);
}
.nav-foot button:hover{border-color:var(--bronze-light);color:var(--paper);}

/* ---------- Main ---------- */
#main{flex:1;background:var(--paper);min-width:0;overflow-y:auto;}
.page{padding:36px 44px;max-width:1180px;}
.page h1{font-family:var(--serif);font-size:26px;color:var(--ink);margin:0 0 4px 0;}
.page .sub{color:var(--slate);font-size:14px;margin:0 0 28px 0;}
.card{
  background:#fff;border:1px solid var(--line-soft);border-radius:10px;padding:24px;margin-bottom:20px;
}
.card h2{font-family:var(--serif);font-size:17px;color:var(--ink);margin:0 0 16px 0;}
.card h3{font-family:var(--serif);font-size:15px;color:var(--ink);margin:22px 0 10px 0;}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px;}
.field label{font-size:12.5px;color:var(--slate);font-weight:600;letter-spacing:.02em;}
.field input,.field select,.field textarea{
  font-family:var(--sans);font-size:14px;padding:9px 11px;border:1px solid var(--line);border-radius:6px;
  color:var(--ink-2);background:var(--paper);width:100%;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--bronze);background:#fff;}
.hint{font-size:12px;color:var(--slate-light);margin-top:2px;}

.carrera-opcion{
  border:1px solid var(--line-soft);border-radius:8px;padding:14px 16px;margin-bottom:12px;
  transition:border-color .15s,background .15s;
}
.carrera-opcion.activa{border-color:var(--bronze);background:#FBF8F1;}
.carrera-opcion .radio-label{
  display:flex;align-items:center;gap:9px;font-family:var(--serif);font-size:15px;color:var(--ink);
  font-weight:600;cursor:pointer;margin-bottom:10px;
}
.carrera-opcion .radio-label input[type="radio"]{width:16px;height:16px;accent-color:var(--bronze);cursor:pointer;}
.carrera-opcion .field{margin-bottom:0;margin-left:25px;}

.btn{
  font-family:var(--sans);font-size:13.5px;padding:9px 16px;border-radius:6px;border:1px solid var(--ink);
  background:var(--ink);color:#fff;cursor:pointer;font-weight:600;text-decoration:none;display:inline-block;
}
.btn:hover{background:var(--ink-2);}
.btn.secondary{background:#fff;color:var(--ink);border-color:var(--line);}
.btn.secondary:hover{border-color:var(--ink);}
.btn.danger{background:#fff;color:var(--bad);border-color:#E4C7C3;}
.btn.danger:hover{background:#FBF0EF;}
.btn.gold{background:var(--bronze);border-color:var(--bronze);}
.btn.gold:hover{background:#87692F;}
.btn:disabled{opacity:.45;cursor:not-allowed;}
.row-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px;align-items:center;}
.row-actions form{margin:0;}

table.data{width:100%;border-collapse:collapse;font-size:13.5px;}
table.data th{
  text-align:left;font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--slate);
  border-bottom:2px solid var(--line);padding:8px 10px;background:var(--paper-2);
}
table.data td{padding:8px 10px;border-bottom:1px solid var(--line-soft);vertical-align:middle;}
table.data tr:hover td{background:#FBFAF6;}
.subarea-row td:first-child{color:var(--slate-light);font-size:12px;}
.nota-input{width:64px;padding:6px 8px;border:1px solid var(--line);border-radius:5px;font-size:13.5px;text-align:center;}
.nota-input.invalid{border-color:var(--bad);background:#FBF0EF;}
.nota-letras{color:var(--slate);font-style:italic;font-size:12.5px;}
.area-name{font-weight:600;color:var(--ink-2);}

.pill{display:inline-block;font-size:11px;padding:2px 9px;border-radius:99px;font-weight:600;}
.pill.on{background:#E7F0E9;color:var(--good);}
.pill.off{background:#F0F0F0;color:var(--slate-light);}
.pill.carrera{background:#EEF1F6;color:#3B4A63;margin-right:6px;}

.student-list-item{
  display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border:1px solid var(--line-soft);
  border-radius:8px;margin-bottom:10px;background:#fff;
}
.student-list-item .who{display:flex;flex-direction:column;gap:3px;}
.student-list-item .who b{font-size:14.5px;color:var(--ink);}
.student-list-item .who span{font-size:12.5px;color:var(--slate);font-family:var(--mono);}
.student-list-item .actions{display:flex;gap:8px;}
.empty{
  text-align:center;padding:50px 20px;color:var(--slate-light);border:1.5px dashed var(--line);border-radius:10px;
}

.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:22px;flex-wrap:wrap;}
.tab{
  padding:10px 15px;font-size:13.5px;cursor:pointer;color:var(--slate);border-bottom:2px solid transparent;
  margin-bottom:-1px;text-decoration:none;
}
.tab.active{color:var(--ink);border-bottom-color:var(--bronze);font-weight:600;}
.tab .dot{display:inline-block;width:6px;height:6px;border-radius:99px;background:var(--good);margin-right:6px;position:relative;top:-1px;}
.tab .dot.off{background:var(--line);}

/* ---------- Certificate / paper preview ---------- */
.paper-wrap{display:flex;justify-content:center;}
.paper{
  width:100%;max-width:850px;background:#fff;border:1px solid var(--line-soft);
  box-shadow:0 2px 18px rgba(27,42,74,0.08);padding:56px 60px;font-family:var(--serif);color:#1a1a1a;
  line-height:1.7;font-size:14.5px;
}
.paper .paper-logo{display:block;margin:0 auto 22px auto;max-height:78px;}
.paper p{text-align:justify;margin:0 0 18px 0;}
.paper .grado-title{font-weight:700;font-size:15.5px;margin:26px 0 4px 0;text-align:center;}
.paper .grado-sub{font-size:13px;color:#444;margin-bottom:10px;text-align:center;}
.paper table{width:100%;border-collapse:collapse;margin-bottom:6px;font-size:12.8px;}
.paper table th,.paper table td{border:1px solid #999;padding:6px 8px;}
.paper table th{background:#F1EEE4;font-size:11px;text-transform:uppercase;letter-spacing:.03em;}
.paper table td.num{text-align:center;width:70px;}
.paper table td.fecha{text-align:center;width:95px;white-space:nowrap;}
.paper .firmas{margin-top:56px;display:flex;justify-content:space-between;gap:30px;}
.paper .firma{flex:1;text-align:center;font-size:13px;}
.paper .firma .linea{border-top:1px solid #333;margin-bottom:6px;padding-top:6px;}
.paper .cierre{margin-top:30px;}

.toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;gap:12px;flex-wrap:wrap;}
.badge-warn{
  background:#FBF3E3;border:1px solid #E9D9AE;color:#7A5B14;padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:18px;
}
.badge-ok{
  background:#E7F0E9;border:1px solid #BFDCC8;color:#2E4F3A;padding:10px 14px;border-radius:8px;font-size:13px;margin-bottom:18px;
}

.plan-area{border:1px solid var(--line-soft);border-radius:8px;padding:14px 16px;margin-bottom:12px;background:var(--paper-2);}
.plan-area .area-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;gap:8px;}
.plan-area .area-head input{font-weight:700;font-size:14px;border:1px solid transparent;background:transparent;color:var(--ink);width:100%;padding:4px 6px;border-radius:5px;}
.plan-area .area-head input:focus{border-color:var(--bronze);background:#fff;outline:none;}
.plan-sub-row{display:flex;gap:8px;align-items:center;margin-bottom:6px;}
.plan-sub-row input{flex:1;font-size:13px;padding:6px 9px;border:1px solid var(--line);border-radius:5px;}
.icon-btn{background:none;border:none;cursor:pointer;color:var(--slate-light);font-size:15px;padding:2px 6px;}
.icon-btn:hover{color:var(--bad);}
.add-link{font-size:12.5px;color:var(--bronze);cursor:pointer;font-weight:600;background:none;border:none;padding:0;}
.add-link:hover{text-decoration:underline;}
.inline-form{display:inline;margin:0;}

/* print */
@media print{
  #sidebar,.toolbar,.badge-warn,.badge-ok,#main .page > h1,#main .page > p.sub{display:none !important;}
  body{background:#fff;}
  #main{overflow:visible;}
  .page{padding:0;max-width:none;}
  .paper{box-shadow:none;border:none;padding:0;max-width:none;}
  .paper-wrap{justify-content:flex-start;}
}