:root{
  --bg:#f4f6f9;
  --text:#1b1f2a;
  --muted:#5b6476;
  --primary:#004a99;
  --accent:#f4c400;
  --card:#ffffff;
  --border:rgba(27,31,42,.12);
  --shadow:0 10px 30px rgba(0,0,0,.08);
  --radius:14px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:Montserrat,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
}

a{color:inherit;text-decoration:none}

.topbar{
  background:#fff;
  border-bottom:1px solid var(--border);
  position:sticky;
  top:0;
  z-index:10;
}

.topbar-inner{
  max-width:980px;
  margin:0 auto;
  padding:14px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.brand{display:flex;align-items:center;gap:12px}
.brand-logo{
  width:44px;height:44px;border-radius:12px;object-fit:cover;
  border:1px solid var(--border);
}
.brand-title{font-weight:700;line-height:1.1}
.brand-subtitle{font-size:12px;color:var(--muted)}

/* derecha: tabs + volver */
.topbar-actions{
  display:flex;
  align-items:center;
  gap:10px;
}

.backlink{
  font-weight:700;
  font-size:13px;
  color:var(--muted);
  padding:10px 12px;
  border-radius:999px;
}
.backlink:hover{background:rgba(0,0,0,.04); color:var(--text)}

.tabs{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
  background:#f7f8fb;
  border:1px solid var(--border);
  padding:6px;
  border-radius:999px;
}
.tab{
  display:inline-flex;align-items:center;justify-content:center;
  padding:10px 12px;
  border-radius:999px;
  font-weight:700;
  font-size:14px;
  color:var(--muted);
}

/* active automático por body */
.portal--students .tab[data-tab="students"],
.portal--teachers .tab[data-tab="teachers"]{
  background:#fff;
  color:var(--text);
  box-shadow:0 6px 18px rgba(0,0,0,.06);
}

.page{
  max-width:980px;
  margin:18px auto;
  padding:0 16px 32px;
}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
}

.card-head{padding:20px 20px 0}
.card-head h1{margin:0 0 6px;font-size:22px}
.muted{margin:0;color:var(--muted);font-size:14px}

form{
  padding:20px;
  display:grid;
  gap:10px;
}

label{font-weight:700;font-size:13px}
.hint{font-size:12px;color:var(--muted);margin-top:-6px}

input,select,button{
  width:100%;
  padding:12px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  font:inherit;
  outline:none;
  background:#fff;
}

input[readonly]{background:#f8fafc}
select:disabled{background:#f8fafc;color:#475569}

button{
  margin-top:6px;
  background:var(--primary);
  color:#fff;
  border:0;
  font-weight:800;
  cursor:pointer;
  transition:.15s transform ease, .15s opacity ease;
}
button:hover{transform:translateY(-1px)}
button:disabled{opacity:.5;cursor:not-allowed;transform:none}

.msg{
  display:none;
  padding:12px;
  border-radius:12px;
  border:1px solid var(--border);
  font-size:14px;
}
.msg.ok{
  display:block;
  background:#ecfdf5;
  border-color:#a7f3d0;
  color:#065f46;
}
.msg.err{
  display:block;
  background:#fef2f2;
  border-color:#fecaca;
  color:#991b1b;
}

@media (max-width:560px){
  .tabs{grid-template-columns:1fr}
  .topbar-actions{gap:6px}
}

/* =========================================
   PROFESOR: Layout + QR + tabla (solo profesores)
   ========================================= */

.portal--teachers label{
  display:block;
  margin-top:6px;
}

/* acciones en fila (y que NO sean barras) */
.portal--teachers .row-actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:6px;
}

/* 🔥 esto le gana al width:100% global */
.portal--teachers .row-actions button{
  width:auto !important;
  padding:10px 14px;
  border-radius:999px;
  margin-top:0;
}

/* En móvil sí conviene full */
@media (max-width:560px){
  .portal--teachers .row-actions button{ width:100% !important; }
}

/* botones variantes */
.portal--teachers .btn-ghost{
  background:#fff !important;
  color:var(--text) !important;
  border:1px solid var(--border) !important;
}

.portal--teachers .btn-accent{
  background:var(--accent) !important;
  color:var(--text) !important;
  border:0 !important;
}

/* grids */
.portal--teachers .grid2{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
}
@media (max-width:560px){
  .portal--teachers .grid2{ grid-template-columns:1fr; }
}

/* separador y headings */
.portal--teachers .sep{
  border:none;
  border-top:1px solid var(--border);
  margin:14px 0;
}

.portal--teachers .h2{
  margin:2px 0 6px;
  font-size:16px;
}

/* QR layout */
.portal--teachers .qr-grid{
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:12px;
  align-items:start;
}
@media (max-width:560px){
  .portal--teachers .qr-grid{ grid-template-columns:1fr; }
}

.portal--teachers .qr-box{
  border:1px dashed var(--border);
  border-radius:12px;
  background:#fff;
  padding:12px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:220px;
}

.portal--teachers .mono{
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;
}

/* tabla */
.portal--teachers .table-wrap{
  overflow:auto;
  border:1px solid var(--border);
  border-radius:12px;
  background:#fff;
}

.portal--teachers table{width:100%; border-collapse:collapse}
.portal--teachers th,
.portal--teachers td{
  padding:10px 10px;
  border-bottom:1px solid var(--border);
  font-size:13px;
}
.portal--teachers th{color:var(--muted); text-align:left}