/* Inferencia Alumni Tracker - Professional UI Theme (PHP 7.4 friendly) */
:root{
  --bg: #0b1220;
  --surface: rgba(255,255,255,0.06);
  --surface-2: rgba(255,255,255,0.09);
  --border: rgba(255,255,255,0.12);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.68);

  --brand: #7c3aed;         /* violet */
  --brand-2: #22c55e;       /* green */
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;

  --shadow: 0 12px 30px rgba(0,0,0,0.35);
  --radius: 18px;
  --radius-sm: 12px;

  --ring: 0 0 0 3px rgba(124,58,237,0.28);
  --font: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Arial,Helvetica,sans-serif;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% 0%, rgba(124,58,237,0.32), transparent 55%),
    radial-gradient(900px 500px at 90% 10%, rgba(59,130,246,0.22), transparent 55%),
    radial-gradient(900px 700px at 40% 110%, rgba(34,197,94,0.18), transparent 55%),
    var(--bg);
  line-height:1.45;
}

a{color: rgba(255,255,255,0.92); text-decoration:none}
a:hover{opacity:0.92; text-decoration:underline}

.container{
  max-width: 1150px;
  margin: 0 auto;
  padding: 24px;
}

.app-shell{
  display:grid;
  grid-template-columns: 280px 1fr;
  gap: 18px;
  align-items:start;
}

@media (max-width: 980px){
  .app-shell{grid-template-columns:1fr}
}

.sidebar{
  position: sticky;
  top: 18px;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.05));
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  overflow:hidden;
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  padding: 10px 10px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.10);
  margin-bottom: 10px;
}
.brand-mark{
  width: 38px;
  height: 38px;
  border-radius: 14px;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.35), rgba(255,255,255,0.10)),
              linear-gradient(135deg, rgba(124,58,237,1), rgba(59,130,246,1));
  box-shadow: 0 10px 22px rgba(124,58,237,0.25);
}
.brand-title{font-weight:700; letter-spacing:0.2px}
.brand-sub{font-size:12px; color: var(--muted); margin-top:2px}

.nav{
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-top: 10px;
}
.nav a{
  display:flex;
  align-items:center;
  gap:10px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: rgba(255,255,255,0.04);
}
.nav a:hover{
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.10);
  text-decoration:none;
}
.nav a.active{
  background: rgba(124,58,237,0.22);
  border-color: rgba(124,58,237,0.35);
}
.nav .hint{
  padding: 10px 12px 0;
  font-size: 12px;
}

.main{
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 18px 22px;
}

h1{
  font-size: 26px;
  margin: 6px 0 14px;
  letter-spacing: -0.2px;
}
h2{
  font-size: 16px;
  margin: 0 0 10px;
  color: rgba(255,255,255,0.92);
}
p{margin: 0 0 10px}
.hint{color: var(--muted); font-size: 13px}

.card{
  border: 1px solid rgba(255,255,255,0.10);
  background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.05));
  border-radius: var(--radius);
  padding: 14px;
  margin: 14px 0;
}
.card > h2{margin-bottom:10px}

.grid{
  display:grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 12px;
}
@media (max-width: 980px){
  .grid{grid-template-columns:1fr}
}

label{
  display:block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}
input[type="text"], input[type="email"], input[type="password"], input[type="date"], input[type="number"], select, textarea{
  width:100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(0,0,0,0.22);
  color: var(--text);
  outline:none;
}
textarea{resize:vertical; min-height: 90px}
input:focus, select:focus, textarea:focus{
  box-shadow: var(--ring);
  border-color: rgba(124,58,237,0.55);
}

input[type="file"]{
  width:100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px dashed rgba(255,255,255,0.22);
  background: rgba(0,0,0,0.18);
  color: var(--muted);
}

button{
  appearance:none;
  border: 1px solid rgba(124,58,237,0.55);
  background: linear-gradient(135deg, rgba(124,58,237,1), rgba(59,130,246,1));
  color: white;
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 600;
  cursor:pointer;
  box-shadow: 0 10px 22px rgba(59,130,246,0.18);
}
button:hover{filter: brightness(1.04)}
button:active{transform: translateY(1px)}
button.secondary{
  border-color: rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.08);
  box-shadow:none;
}
button.danger{
  border-color: rgba(239,68,68,0.55);
  background: linear-gradient(135deg, rgba(239,68,68,1), rgba(245,158,11,1));
}
.small{
  padding: 7px 10px;
  font-size: 13px;
  border-radius: 10px;
  margin-top:6px;
}

.table{
  width:100%;
  border-collapse: separate;
  border-spacing: 0;
  overflow:hidden;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.10);
  background: rgba(0,0,0,0.18);
}
.table th, .table td{
  padding: 10px 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  vertical-align: top;
}
.table th{
  font-size: 12px;
  color: rgba(255,255,255,0.78);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  background: rgba(255,255,255,0.06);
}
.table tr:last-child td{border-bottom:none}

.badge{
  display:inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.06);
}
.badge-green{ background: rgba(34,197,94,0.18); border-color: rgba(34,197,94,0.35); color: rgba(215,255,228,0.92); }
.badge-gray { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.18); color: rgba(255,255,255,0.78); }

.checks{display:flex; flex-direction:column; gap:8px; margin-top:6px;}
.check{font-size:13px; color: var(--muted); display:flex; align-items:center; gap:10px;}
.check input{width:auto; margin:0}

.share-row{ display:flex; gap:8px; align-items:center; margin-top:8px; flex-wrap:wrap; }
.share-input{ flex:1; min-width: 240px; }

.flash{
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.08);
  padding: 10px 12px;
  margin: 10px 0 14px;
}
.flash.success{ border-color: rgba(34,197,94,0.35); background: rgba(34,197,94,0.14); }
.flash.error{ border-color: rgba(239,68,68,0.35); background: rgba(239,68,68,0.14); }

.kpi-row{
  display:grid;
  grid-template-columns: repeat(4, minmax(0,1fr));
  gap: 12px;
  margin: 10px 0 14px;
}
@media (max-width: 980px){ .kpi-row{grid-template-columns:1fr 1fr} }
.kpi{
  padding: 12px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.10);
  background: rgba(0,0,0,0.16);
}
.kpi .label{font-size:12px; color: var(--muted)}
.kpi .value{font-size:20px; font-weight:800; margin-top:4px}

.hero{display:flex; gap:18px; align-items:center; padding: 18px; border-radius: var(--radius); border:1px solid rgba(255,255,255,0.10); background: rgba(0,0,0,0.18);}
.hero-illus{width:160px; height:160px; display:flex; align-items:center; justify-content:center; border-radius: 22px; background: rgba(255,255,255,0.05); border:1px solid rgba(255,255,255,0.10);}
.hero-kicker{display:inline-block; font-weight:800; letter-spacing:1px; font-size:12px; color: rgba(255,255,255,0.78); padding:4px 10px; border-radius:999px; border:1px solid rgba(255,255,255,0.16); background: rgba(255,255,255,0.06);}
.btn-link{display:inline-flex; align-items:center; justify-content:center; gap:8px; padding:10px 14px; border-radius:12px; border:1px solid rgba(124,58,237,0.55); background: linear-gradient(135deg, rgba(124,58,237,1), rgba(59,130,246,1)); color:white; font-weight:600; text-decoration:none;}
.btn-link:hover{text-decoration:none; filter:brightness(1.04)}
.btn-link.secondary{border-color: rgba(255,255,255,0.16); background: rgba(255,255,255,0.08);}
.field-error{margin-top:6px; font-size:12px; color: rgba(255,255,255,0.82); background: rgba(239,68,68,0.14); border:1px solid rgba(239,68,68,0.35); padding:8px 10px; border-radius:12px;}
.input-error{border-color: rgba(239,68,68,0.55) !important; box-shadow: 0 0 0 3px rgba(239,68,68,0.18) !important;}
.page-top{display:flex; align-items:flex-start; justify-content:space-between; gap:12px; padding: 6px 0 10px; border-bottom: 1px solid rgba(255,255,255,0.10); margin-bottom: 10px;}
.page-top .meta{color: var(--muted); font-size: 13px; margin-top:4px;}
.page-actions{display:flex; gap:10px; flex-wrap:wrap; justify-content:flex-end;}
.page-actions a{text-decoration:none;}
.empty{display:flex; gap:16px; align-items:center; padding:16px; border-radius: var(--radius); border:1px dashed rgba(255,255,255,0.20); background: rgba(0,0,0,0.16);}
.linklike{appearance:none; background:none; border:none; color: rgba(255,255,255,0.92); font-weight:700; cursor:pointer; padding:0;}
.linklike:hover{opacity:0.9; text-decoration:underline}