*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #f1f5f9;
  --card:         #ffffff;
  --border:       #e2e8f0;
  --teal:         #0d9488;
  --teal-dark:    #0f766e;
  --teal-light:   #e6fdf8;
  --text:         #1e293b;
  --text-muted:   #64748b;
  --text-subtle:  #94a3b8;
  --danger:       #dc2626;
  --danger-light: #fef2f2;
  --success:      #16a34a;
  --success-light:#f0fdf4;
  --warning:      #d97706;
  --radius:       0.5rem;
  --radius-lg:    0.75rem;
  --shadow:       0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.08);
  --dur:          0.2s;
  --ease:         cubic-bezier(0.4,0,0.2,1);
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* ── Typography ── */
h1 { font-size: 1.5rem; font-weight: 700; }
h2 { font-size: 1.25rem; font-weight: 600; }
h3 { font-size: 1rem; font-weight: 600; }

/* ── Layout ── */
.container { max-width: 900px; margin: 0 auto; padding: 0 1rem; }

/* ── Navbar ── */
.navbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 0.875rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  font-size: 1.05rem;
}
.navbar-brand .dot {
  width: 8px; height: 8px;
  background: var(--teal);
  border-radius: 50%;
}
.navbar-brand span { color: var(--teal); }
.navbar-right { font-size: 0.8rem; color: var(--text-muted); }

/* ── Card ── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

/* ── Button ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
  text-decoration: none;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--teal);
  color: #fff;
  border-color: var(--teal);
}
.btn-primary:hover { background: var(--teal-dark); border-color: var(--teal-dark); }
.btn-outline {
  background: transparent;
  color: var(--teal);
  border-color: var(--teal);
}
.btn-outline:hover { background: var(--teal-light); }
.btn-danger {
  background: transparent;
  color: var(--danger);
  border-color: #fca5a5;
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
}
.btn-danger:hover { background: var(--danger-light); }
.btn-sm { padding: 0.4rem 0.875rem; font-size: 0.8rem; }
.btn-full { width: 100%; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

/* ── Form ── */
.form-group { margin-bottom: 1rem; }
.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.form-control {
  width: 100%;
  padding: 0.65rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--card);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  outline: none;
}
.form-control:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(13,148,136,0.12);
}
.form-control.pin-input {
  font-size: 1.4rem;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.15em;
  padding: 0.875rem;
  text-transform: uppercase;
}

/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  z-index: 9999;
  transform: translateY(0);
  transition: opacity var(--dur), transform var(--dur);
  max-width: 320px;
}
.toast.success { background: var(--success); color: #fff; }
.toast.error   { background: var(--danger);  color: #fff; }
.toast.hide    { opacity: 0; transform: translateY(8px); pointer-events: none; }

/* ── Badge ── */
.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-teal    { background: var(--teal-light); color: var(--teal-dark); }
.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger  { background: var(--danger-light); color: var(--danger); }

/* ── Stat card ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  text-align: center;
}
.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--teal);
  line-height: 1;
}
.stat-card .stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* ── Table ── */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
th {
  background: var(--bg);
  padding: 0.65rem 0.875rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
td {
  padding: 0.75rem 0.875rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--bg); }

/* ── Result slip ── */
.result-slip {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  animation: slideUp 0.3s var(--ease);
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.slip-header {
  background: var(--teal);
  color: #fff;
  padding: 1.5rem;
  text-align: center;
}
.slip-header h2 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.slip-header p  { font-size: 0.85rem; opacity: 0.85; }
.slip-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  padding: 1.25rem;
  background: var(--teal-light);
  border-bottom: 1px solid var(--border);
}
.slip-meta .meta-item label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.15rem;
}
.slip-meta .meta-item span {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
}
.slip-body { padding: 1.25rem; }
.slip-footer {
  padding: 1rem 1.25rem;
  background: var(--bg);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ── Grade colours ── */
.grade-a { color: var(--success); font-weight: 700; }
.grade-b { color: var(--teal);    font-weight: 700; }
.grade-c { color: var(--warning); font-weight: 700; }
.grade-d, .grade-e, .grade-f { color: var(--danger); font-weight: 700; }

/* ── Empty / error state ── */
.empty-state {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--text-subtle);
}
.empty-state svg { opacity: 0.3; margin-bottom: 0.75rem; }
.empty-state p { font-size: 0.9rem; }

.alert {
  padding: 0.875rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid transparent;
}
.alert-error   { background: var(--danger-light);  color: var(--danger);  border-color: #fca5a5; }
.alert-success { background: var(--success-light); color: var(--success); border-color: #86efac; }

/* ── Spinner ── */
.spinner {
  display: inline-block;
  width: 18px; height: 18px;
  border: 2.5px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Divider ── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

/* ── Print ── */
@media print {
  body { background: #fff; }
  .navbar, .pin-section, .btn, .slip-footer .btn, .no-print { display: none !important; }
  .result-slip { box-shadow: none; border: none; }
  .slip-header { background: #1e293b !important; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
}

@media (max-width: 600px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
  .stat-card  { padding: 0.875rem 0.5rem; }
  .stat-card .stat-value { font-size: 1.5rem; }
  .slip-meta { grid-template-columns: 1fr; }
}