:root {
  /* Colors */
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --ink: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #f0f9ff;
  --primary-border: #bae6fd;
  --primary-ink: #ffffff;
  
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --danger-border: #fecaca;
  --success: #10b981;
  --success-light: #ecfdf5;

  /* Elevation & Shape */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  padding: 12px 12px 32px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  -webkit-font-smoothing: antialiased;
}

.app-wrapper {
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

/* --- Topbar --- */
.topbar {
  background: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 14px 20px;
  margin: 12px 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary);
}

.brand i { 
  font-size: 1.3rem; 
  background: var(--primary-light);
  padding: 8px;
  border-radius: var(--radius-sm);
}

.topbar-extra { 
  font-size: 0.85rem; 
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-secure {
  background: var(--success-light);
  color: var(--success);
  padding: 4px 8px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.75rem;
}

/* --- Cards --- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 28px;
  margin-bottom: 20px;
  transition: var(--transition);
}

/* --- Login View --- */
.login-header {
  text-align: center;
  margin-bottom: 24px;
}

.login-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.login-header .subhead {
  color: var(--muted);
  font-size: 0.925rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 420px;
  margin: 0 auto;
}

.login-form .field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.login-form label {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 6px;
}

.login-form label i { color: var(--primary); }

.login-form input {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: var(--surface-alt);
  color: var(--ink);
  transition: var(--transition);
  width: 100%;
}

.login-form input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 4px rgba(2, 132, 199, 0.15);
}

/* --- Buttons --- */
.btn-primary {
  background: var(--primary);
  color: var(--primary-ink);
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
}

.btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.btn-secondary {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--ink);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
}

.btn-secondary:hover { background: var(--surface-alt); border-color: #cbd5e1; }

.error-message {
  color: var(--danger);
  background: var(--danger-light);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--danger-border);
  font-weight: 500;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* --- Result View Header --- */
.result-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.result-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 6px;
}

.patient-meta {
  color: var(--muted);
  font-size: 0.875rem;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.patient-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* --- Meta Grid --- */
.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  background: var(--surface-alt);
  padding: 16px;
  border-radius: var(--radius-md);
  margin: 20px 0;
  border: 1px solid var(--border);
}

.meta-grid .item .k {
  font-size: 0.725rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 2px;
}

.meta-grid .item .v {
  font-weight: 600;
  font-size: 0.925rem;
  color: var(--ink);
  word-break: break-word;
}

/* --- Conclusion --- */
.conclusion {
  background: var(--primary-light);
  border: 1px solid var(--primary-border);
  border-left: 4px solid var(--primary);
  padding: 16px;
  border-radius: var(--radius-sm);
  margin: 20px 0;
}

.conclusion h3 {
  font-size: 0.825rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.conclusion p {
  font-size: 0.95rem;
  color: #0c4a6e;
}

/* --- Categories & Tables --- */
.category {
  margin-bottom: 28px;
}

.category h3 {
  font-size: 1.05rem;
  font-weight: 700;
  padding-bottom: 8px;
  margin-bottom: 12px;
  color: var(--ink);
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
}

.category h3 i { color: var(--primary); }

.table-wrap {
  width: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th {
  text-align: left;
  padding: 10px 12px;
  font-size: 0.725rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  font-weight: 700;
}

td {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tr:last-child td { border-bottom: none; }

td.result {
  font-weight: 700;
}

td.result.abnormal {
  color: var(--danger);
}

.group-row td {
  background: var(--surface-alt);
  font-weight: 700;
  color: var(--primary);
  padding: 8px 12px;
}

.group-row td i { margin-right: 6px; }

/* --- Mobile Responsive Table Transformation --- */
@media (max-width: 600px) {
  body { padding: 8px 8px 24px; }
  .card { padding: 18px 14px; border-radius: var(--radius-md); }
  
  .result-header { flex-direction: column; }
  .actions-right { width: 100%; }
  .actions-right .btn-secondary { width: 100%; }

  /* Transform HTML table to mobile cards */
  table, thead, tbody, th, td, tr { display: block; }
  thead { display: none; }
  
  tr {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
    padding: 10px 12px;
  }
  
  tr.group-row {
    background: var(--primary-light);
    border-color: var(--primary-border);
    padding: 8px 12px;
  }
  
  td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px dashed var(--border);
    text-align: right;
  }
  
  td:last-child { border-bottom: none; }
  
  /* Mobile Data Labels */
  td::before {
    content: attr(data-label);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--muted);
    text-align: left;
    padding-right: 12px;
  }

  td.result::before { color: var(--ink); }
  .group-row td::before { content: none; }
  .group-row td { text-align: left; display: block; }
}

/* --- PDF Section --- */
.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

#pdf-container { margin-top: 16px; }

#pdf-container iframe {
  width: 100%;
  height: 600px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

/* --- Footer --- */
.footer {
  margin-top: auto;
  padding-top: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.hidden { display: none !important; }