:root{
  --brand:#f97316;
  --brand-dark:#c2410c;
  --bg:#0f1115;
  --card:#181b21;
  --card-alt:#1f232b;
  --text:#f3f4f6;
  --muted:#9ca3af;
  --border:#2a2f3a;
  --error:#ef4444;
  --ok:#22c55e;
  --warn:#eab308;
  --radius:12px;
}
*{box-sizing:border-box;}
body{
  margin:0;
  font-family:'Segoe UI',Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
}

/* ---------- Login page ---------- */
.login-wrap{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:20px;
  background:radial-gradient(circle at 30% 20%, #1c1008, var(--bg) 60%);
}
.login-card{
  width:100%;
  max-width:380px;
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:32px 28px;
  box-shadow:0 20px 50px rgba(0,0,0,.5);
}
.login-card .logo{
  text-align:center;
  margin-bottom:24px;
}
.login-card .logo h1{
  margin:0;
  font-size:1.6rem;
  letter-spacing:.5px;
  background:linear-gradient(135deg,var(--brand),#fb923c);
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}
.login-card .logo p{
  margin:4px 0 0;
  color:var(--muted);
  font-size:.85rem;
  text-transform:uppercase;
  letter-spacing:1.5px;
}
label{
  display:block;
  font-size:.85rem;
  color:var(--muted);
  margin:14px 0 6px;
}
input,select{
  width:100%;
  padding:11px 12px;
  border-radius:8px;
  border:1px solid var(--border);
  background:var(--card-alt);
  color:var(--text);
  font-size:.95rem;
  outline:none;
}
input:focus,select:focus{border-color:var(--brand);}
button{
  cursor:pointer;
  font-family:inherit;
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:6px;
  padding:11px 18px;
  border-radius:8px;
  border:none;
  font-weight:600;
  font-size:.9rem;
  background:var(--brand);
  color:#fff;
  transition:background .15s;
}
.btn:hover{background:var(--brand-dark);}
.btn:disabled{opacity:.6;cursor:not-allowed;}
.btn-outline{
  background:transparent;
  border:1px solid var(--border);
  color:var(--text);
}
.btn-outline:hover{border-color:var(--brand);}
.btn-danger{background:var(--error);}
.btn-danger:hover{background:#b91c1c;}
.btn-sm{padding:6px 10px;font-size:.8rem;}
.btn-block{width:100%;margin-top:20px;}
.error-text{
  color:var(--error);
  font-size:.85rem;
  min-height:18px;
  margin-top:10px;
  text-align:center;
}

/* ---------- Dashboard shell ---------- */
.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 24px;
  background:var(--card);
  border-bottom:1px solid var(--border);
  position:sticky;
  top:0;
  z-index:20;
}
.topbar .brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:700;
  letter-spacing:.5px;
}
.topbar .brand .dot{
  width:10px;height:10px;border-radius:50%;
  background:linear-gradient(135deg,var(--brand),#fb923c);
}
.tabs{
  display:flex;
  gap:6px;
  padding:12px 24px 0;
  background:var(--card);
  border-bottom:1px solid var(--border);
  overflow-x:auto;
}
.tab-btn{
  background:transparent;
  border:none;
  color:var(--muted);
  padding:10px 16px;
  font-size:.9rem;
  font-weight:600;
  border-bottom:2px solid transparent;
  white-space:nowrap;
}
.tab-btn.active{
  color:var(--brand);
  border-bottom-color:var(--brand);
}
main{
  max-width:1100px;
  margin:0 auto;
  padding:24px 20px 60px;
}
.tab-panel{display:none;}
.tab-panel.active{display:block;}

.stat-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:14px;
  margin-bottom:24px;
}
.stat-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px;
}
.stat-card .value{font-size:1.8rem;font-weight:700;}
.stat-card .label{color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.5px;margin-top:4px;}
.stat-card.warn .value{color:var(--warn);}
.stat-card.danger .value{color:var(--error);}
.stat-card.ok .value{color:var(--ok);}

.section-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin:28px 0 14px;
  gap:12px;
  flex-wrap:wrap;
}
.section-head h2{margin:0;font-size:1.1rem;}
.search-input{max-width:240px;}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
}
table{
  width:100%;
  border-collapse:collapse;
  font-size:.88rem;
}
th,td{
  text-align:left;
  padding:12px 14px;
  border-bottom:1px solid var(--border);
  white-space:nowrap;
}
th{
  color:var(--muted);
  font-weight:600;
  font-size:.75rem;
  text-transform:uppercase;
  letter-spacing:.4px;
  background:var(--card-alt);
}
tr:last-child td{border-bottom:none;}
.empty-row td{
  text-align:center;
  color:var(--muted);
  padding:26px;
  white-space:normal;
}

.badge{
  display:inline-block;
  padding:3px 10px;
  border-radius:20px;
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.3px;
}
.badge-ok{background:rgba(34,197,94,.15);color:var(--ok);}
.badge-warn{background:rgba(234,179,8,.15);color:var(--warn);}
.badge-danger{background:rgba(239,68,68,.15);color:var(--error);}
.badge-muted{background:rgba(156,163,175,.15);color:var(--muted);}

.filter-chips{display:flex;gap:8px;flex-wrap:wrap;}
.chip{
  border:1px solid var(--border);
  background:transparent;
  color:var(--muted);
  padding:6px 14px;
  border-radius:20px;
  font-size:.8rem;
  font-weight:600;
}
.chip.active{background:var(--brand);border-color:var(--brand);color:#fff;}

.member-list{
  display:flex;
  flex-direction:column;
  gap:8px;
  max-height:60vh;
  overflow-y:auto;
}
.member-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  background:var(--card-alt);
  border:1px solid var(--border);
  border-radius:10px;
  padding:12px 14px;
}
.member-row .info b{display:block;}
.member-row .info span{color:var(--muted);font-size:.8rem;}

/* ---------- Modal ---------- */
.modal-overlay{
  position:fixed;
  inset:0;
  background:rgba(0,0,0,.6);
  display:none;
  align-items:center;
  justify-content:center;
  padding:20px;
  z-index:100;
}
.modal-overlay.open{display:flex;}
.modal{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  width:100%;
  max-width:440px;
  max-height:90vh;
  overflow-y:auto;
  padding:24px;
}
.modal.modal-wide{max-width:560px;}
.modal-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:6px;
}
.modal-head h3{margin:0;font-size:1.1rem;}
.modal-close{
  background:transparent;
  border:none;
  color:var(--muted);
  font-size:1.3rem;
  line-height:1;
}
.modal-actions{
  display:flex;
  gap:10px;
  margin-top:20px;
}
.modal-actions .btn{flex:1;}

.form-row-2{display:grid;grid-template-columns:1fr 1fr;gap:0 12px;}

/* Overdue fee popup */
.overdue-popup .modal-head h3{color:var(--error);}
.overdue-list{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-top:12px;
  max-height:320px;
  overflow-y:auto;
}
.overdue-item{
  display:flex;
  align-items:center;
  justify-content:space-between;
  background:var(--card-alt);
  border:1px solid rgba(239,68,68,.35);
  border-radius:10px;
  padding:10px 12px;
  gap:10px;
}
.overdue-item .info b{display:block;}
.overdue-item .info span{color:var(--error);font-size:.78rem;font-weight:600;}

.toast{
  position:fixed;
  bottom:20px;
  left:50%;
  transform:translateX(-50%);
  background:var(--card-alt);
  border:1px solid var(--border);
  color:var(--text);
  padding:12px 20px;
  border-radius:8px;
  font-size:.85rem;
  z-index:200;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s, transform .2s;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(-6px);}

@media(max-width:520px){
  .form-row-2{grid-template-columns:1fr;}
  th,td{padding:10px 8px;font-size:.82rem;}
}