:root{
  --bg:#f3f4f6;
  --bg-soft:#e5ecff;
  --card:#ffffff;
  --card-soft:rgba(255,255,255,0.9);
  --muted:#6b7280;
  --accent:#ef4444;
  --primary:#2563eb;
  --primary-soft:#dbeafe;
  --primary-strong:#1d4ed8;
  --radius:14px;
  --gap:14px;
  --shadow-soft:0 18px 45px rgba(15,23,42,0.12);
  --border-subtle:1px solid rgba(148,163,184,0.25);
  font-family: Inter, system-ui;
}

/* RESET */
*{
  box-sizing:border-box;
  margin:0;
  padding:0;
}

body{
  margin:0;
  background: radial-gradient(circle at top left,#e0f2fe,#f5f3ff 40%,#f9fafb 80%);
  color:#0f172a;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height:1.5;
  transition: background 0.3s ease, color 0.3s ease;
}

body.dark{
  background: radial-gradient(circle at top left,#020617,#020617 30%,#020617 100%);
  color:#e5e7eb;
}

/* HEADER */
.site-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 18px;
  position:sticky;
  top:0;
  z-index:20;
  backdrop-filter:blur(16px);
  background:linear-gradient(90deg,rgba(15,23,42,0.9),rgba(30,64,175,0.9));
  color:white;
  box-shadow:0 14px 30px rgba(15,23,42,0.5);
}

.brand{
  display:flex;
  gap:14px;
  align-items:center;
}
.brand .logo{
  width:70px;
  height:70px;
  object-fit:contain;
  border-radius:16px;
  background:rgba(15,23,42,0.7);
  padding:6px;
}
.brand-text h1{
  font-family:'Poppins',system-ui;
  font-size:1.4rem;
  margin-bottom:2px;
}
.subtitle{
  font-family:'Kavivanar','Noto Sans Tamil',Inter,system-ui;
  font-size:0.95rem;
  opacity:0.9;
}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
}

/* THEME BUTTON */
.ghost-btn{
  background:transparent;
  border:1px solid rgba(148,163,184,0.5);
  color:#e5e7eb;
  padding:6px 12px;
  border-radius:999px;
  font-size:0.8rem;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:6px;
  transition:background 0.2s, border 0.2s, transform 0.1s;
}
.ghost-btn:hover{
  background:rgba(15,23,42,0.3);
  transform:translateY(-1px);
}

/* CONTAINER */
.container{
  max-width:980px;
  margin:0 auto;
  padding:18px 16px 80px;
}

/* CARD SHELL */
.card-shell{
  background:var(--card-soft);
  border-radius:calc(var(--radius) + 2px);
  box-shadow:var(--shadow-soft);
  padding:14px 16px;
  border:var(--border-subtle);
  backdrop-filter:blur(18px);
}
body.dark .card-shell{
  background:rgba(15,23,42,0.85);
  border-color:rgba(148,163,184,0.35);
}

/* CONTROLS */
.controls{
  display:flex;
  flex-direction:column;
  gap:var(--gap);
  margin-bottom:18px;
}

.primary-actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}

.primary{
  background:linear-gradient(135deg,var(--primary),#7c3aed);
  color:#fff;
  padding:10px 16px;
  border:0;
  border-radius:999px;
  cursor:pointer;
  font-weight:600;
  font-size:0.9rem;
  display:inline-flex;
  align-items:center;
  gap:8px;
  box-shadow:0 12px 25px rgba(37,99,235,0.35);
  transition:transform 0.14s ease, box-shadow 0.14s ease, background 0.2s;
}
.primary.outlined{
  background:transparent;
  color:var(--primary-strong);
  border:1px solid rgba(37,99,235,0.3);
  box-shadow:none;
}
.primary:hover{
  transform:translateY(-1px);
  box-shadow:0 16px 32px rgba(79,70,229,0.55);
}
.primary.outlined:hover{
  background:var(--primary-soft);
}

.danger{
  background:var(--accent);
  color:#fff;
  padding:10px 14px;
  border:0;
  border-radius:999px;
  cursor:not-allowed;
  opacity:0.7;
}

/* BUTTON ANIMATION */
.btn-animated{
  position:relative;
  overflow:hidden;
}
.btn-animated::after{
  content:"";
  position:absolute;
  left:-40%;
  top:0;
  width:40%;
  height:100%;
  background:linear-gradient(120deg,rgba(255,255,255,0.4),transparent);
  transform:skewX(-20deg);
  opacity:0;
  transition:opacity 0.2s, transform 0.5s;
}
.btn-animated:hover::after{
  opacity:1;
  transform:translateX(250%) skewX(-20deg);
}

/* FILTERS */
.filters{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.field{
  flex:1 1 220px;
}
.filters input,
.filters select{
  width:100%;
  padding:10px 12px;
  border-radius:999px;
  border:1px solid rgba(148,163,184,0.4);
  outline:none;
  background:#f9fafb;
  font-size:0.9rem;
  transition:border 0.15s, box-shadow 0.15s, background 0.2s;
}
.filters input:focus,
.filters select:focus{
  border-color:var(--primary);
  box-shadow:0 0 0 1px rgba(37,99,235,0.4);
  background:white;
}
body.dark .filters input,
body.dark .filters select{
  background:#020617;
  color:#e5e7eb;
}

/* LIST */
.list-section{
  display:grid;
  gap:12px;
}

/* TABLE MODE */
.table{
  width:100%;
  border-collapse:collapse;
  background:var(--card);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:var(--shadow-soft);
}
.table thead{
  background:linear-gradient(90deg,#1d4ed8,#7c3aed);
  color:white;
}
.table th, .table td{
  padding:11px 12px;
  border-bottom:1px solid rgba(148,163,184,0.25);
  font-size:0.9rem;
}
.table tbody tr:nth-child(even){
  background:#f9fafb;
}
.table tbody tr:hover{
  background:#eef2ff;
}
body.dark .table{
  background:#020617;
}
body.dark .table tbody tr:nth-child(even){
  background:#020617;
}
body.dark .table tbody tr:hover{
  background:#111827;
}

/* CARD MODE (mobile) */
.card{
  background:var(--card);
  padding:16px 16px 14px;
  border-radius:var(--radius);
  box-shadow:0 10px 30px rgba(15,23,42,0.22);
  border:var(--border-subtle);
  animation:cardIn 0.25s ease-out;
}
@keyframes cardIn{
  from{opacity:0;transform:translateY(6px) scale(0.98);}
  to{opacity:1;transform:translateY(0) scale(1);}
}
body.dark .card{
  background:#020617;
  border-color:rgba(148,163,184,0.35);
}

.meta-main{
  display:flex;
  align-items:center;
  gap:12px;
}
.meta-text strong{
  font-size:1.05rem;
  display:block;
  margin-bottom:2px;
}
.meta-text span{
  font-size:0.85rem;
  color:var(--muted);
}
body.dark .meta-text span{
  color:#9ca3af;
}

.card-info-line{
  font-size:0.85rem;
  margin-top:8px;
  color:#374151;
  line-height:1.6;
}
body.dark .card-info-line{
  color:#e5e7eb;
}

.card-footer{
  display:flex;
  align-items:center;
  margin-top:8px;
  justify-content:space-between;
}
.card-footer small{
  font-size:0.78rem;
  color:var(--muted);
}

/* BADGES */
.badge{
  padding:6px 10px;
  border-radius:999px;
  font-weight:700;
  font-size:0.8rem;
  color:white;
  box-shadow:0 3px 10px rgba(0,0,0,0.25);
}

/* Color by group */
.badge[data-bg^="A+"]{ background:#f97316; }
.badge[data-bg^="A-"]{ background:#ea580c; }
.badge[data-bg^="B+"]{ background:#0ea5e9; }
.badge[data-bg^="B-"]{ background:#0369a1; }
.badge[data-bg^="AB"]{ background:#8b5cf6; }
.badge[data-bg^="O+"]{ background:#ef4444; }
.badge[data-bg^="O-"]{ background:#b91c1c; }
.badge[data-bg^="A2B+"]{ background:#d609bb; }
.badge[data-bg^="A1+"]{ background:#faa302; }

/* Eligibility pill (for future use) */
.pill{
  padding:3px 9px;
  border-radius:999px;
  font-size:0.75rem;
  font-weight:500;
}
.pill.ok{ background:#dcfce7;color:#166534; }
.pill.no{ background:#fee2e2;color:#b91c1c; }

/* Drawer */
.drawer{
  position:fixed;
  right:20px;
  top:80px;
  width:390px;
  max-width:95vw;
  transform:translateX(140%);
  transition:transform 0.3s ease, opacity 0.3s ease;
  opacity:0;
  z-index:30;
}
.drawer[aria-hidden="false"]{
  transform:none;
  opacity:1;
}
.donor-form{
  background:linear-gradient(180deg,#eef2ff,#ffffff);
  padding:18px 18px 12px;
  border-radius:20px;
  box-shadow:0 25px 45px rgba(15,23,42,0.42);
  border:var(--border-subtle);
}
body.dark .donor-form{
  background:linear-gradient(180deg,#020617,#020617);
  border-color:rgba(148,163,184,0.4);
}

/* Form */
.form-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  margin-bottom:10px;
}
.form-head h2{
  font-family:'Poppins',system-ui;
  font-size:1.1rem;
}
.form-subtitle{
  font-size:0.8rem;
  color:var(--muted);
}
body.dark .form-subtitle{
  color:#9ca3af;
}
.icon-btn{
  border:0;
  background:transparent;
  font-size:1.8rem;
  cursor:pointer;
  color:#6b7280;
  line-height:1;
}
.icon-btn:hover{
  color:#111827;
}
body.dark .icon-btn{
  color:#9ca3af;
}
.row{
  margin-bottom:10px;
}
.two-col{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
}
.donor-form label{
  display:flex;
  flex-direction:column;
  font-size:0.8rem;
  gap:4px;
}
.donor-form input,
.donor-form select{
  padding:8px 10px;
  border-radius:10px;
  border:1px solid rgba(148,163,184,0.6);
  background:#f9fafb;
  font-size:0.85rem;
  outline:none;
  transition:border 0.15s, box-shadow 0.15s, background 0.15s;
}
.donor-form input:focus,
.donor-form select:focus{
  border-color:var(--primary);
  box-shadow:0 0 0 1px rgba(37,99,235,0.45);
  background:white;
}
body.dark .donor-form input,
body.dark .donor-form select{
  background:#020617;
  color:#e5e7eb;
}
.form-actions{
  display:flex;
  align-items:center;
  gap:8px;
  margin-top:8px;
}
.hint-text{
  margin-top:6px;
  font-size:0.75rem;
  color:var(--muted);
}
body.dark .hint-text{
  color:#9ca3af;
}

/* FOOTER */
.site-footer{
  text-align:center;
  padding:20px;
  color:#777;
  font-size:0.8rem;
}
body.dark .site-footer{
  color:#9ca3af;
}

/* FLOATING ACTION BUTTON */
.fab{
  position:fixed;
  bottom:18px;
  right:18px;
  width:54px;
  height:54px;
  border-radius:999px;
  border:0;
  background:linear-gradient(145deg,#22c55e,#16a34a);
  color:white;
  font-size:1.8rem;
  display:flex;
  align-items:center;
  justify-content:center;
  box-shadow:0 15px 35px rgba(22,163,74,0.6);
  cursor:pointer;
  z-index:25;
  display:none; /* hidden on desktop, shown on mobile */
  transition:transform 0.14s, box-shadow 0.14s;
}
.fab:hover{
  transform:translateY(-2px);
  box-shadow:0 18px 42px rgba(22,163,74,0.8);
}

/* DARK MODE OVERRIDES */
body.dark{
  --muted:#9ca3af;
}
body.dark .badge{
  box-shadow:0 3px 10px rgba(0,0,0,0.6);
}

/* RESPONSIVE */
@media (max-width:800px){
  .site-header{
    flex-direction:column;
    align-items:flex-start;
    gap:6px;
  }
  .container{
    padding-inline:12px;
  }
  .controls{
    padding:12px;
  }
  .table{
    display:none;
  }
  .card{
    border-radius:18px;
  }
  .drawer{
    left:12px;
    right:12px;
    bottom:18px;
    top:auto;
    width:auto;
  }
  .donor-form{
    border-radius:20px;
  }
  .fab{
    display:flex;
  }
}

.loading-state{
  text-align:center;
  padding:18px;
  font-size:0.9rem;
  color:var(--muted);
}

.loading-spinner{
  width:18px;
  height:18px;
  border-radius:50%;
  border:2px solid rgba(148,163,184,0.5);
  border-top-color:var(--primary);
  margin:0 auto 8px;
  animation:spin 0.6s linear infinite;
}

@keyframes spin{
  to{ transform:rotate(360deg); }
}