/* =========================================
   DERMATE.APP — Design System v2
   ========================================= */
/* Note: brand name is DerMate.app */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* Brand */
  --primary:        #0EA5E9;
  --primary-dark:   #0284C7;
  --primary-darker: #0369A1;
  --primary-light:  #F0F9FF;
  --primary-mid:    #BAE6FD;

  /* Neutrals */
  --gray-50:  #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;

  /* Semantic */
  --success:       #10B981;
  --success-light: #ECFDF5;
  --success-border:#A7F3D0;
  --warning:       #F59E0B;
  --warning-light: #FFFBEB;
  --warning-border:#FCD34D;
  --danger:        #EF4444;
  --danger-light:  #FEF2F2;

  /* Layout */
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 14px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0,0,0,.05);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow:    0 4px 6px rgba(0,0,0,.05), 0 2px 4px rgba(0,0,0,.04);
  --shadow-md: 0 10px 15px rgba(0,0,0,.07), 0 4px 6px rgba(0,0,0,.04);
  --shadow-lg: 0 20px 25px rgba(0,0,0,.08), 0 8px 10px rgba(0,0,0,.04);

  /* Surfaces */
  --bg:      #F0F6FF;
  --surface: #FFFFFF;
  --text:    #1E293B;
  --muted:   #64748B;

  /* Transitions */
  --transition: .18s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* ================================================
   NAVBAR
   ================================================ */
nav {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: var(--shadow-xs);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 28px;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: inline-flex;
  align-items: baseline;
  text-decoration: none;
  flex-shrink: 0;
  font-family: 'Inter', sans-serif;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -.45px;
  line-height: 1;
}

.logo-derm { color: #1E293B; }
.logo-ate  { color: var(--primary); }

.logo-m {
  background: linear-gradient(to right, #1E293B 50%, var(--primary) 50%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 900;
}

.logo-dotapp {
  color: var(--primary);
  font-weight: 500;
  font-size: .72em;
  letter-spacing: 0;
  margin-left: .03em;
  opacity: .5;
  -webkit-text-fill-color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 2px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--gray-600);
  font-size: .875rem;
  font-weight: 500;
  padding: 6px 13px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.nav-links a:hover { background: var(--gray-100); color: var(--gray-800); }
.nav-links a.active { background: var(--primary-light); color: var(--primary-dark); font-weight: 600; }

/* ================================================
   MAIN
   ================================================ */
main {
  flex: 1;
  max-width: 1120px;
  margin: 0 auto;
  width: 100%;
  padding: 40px 28px 80px;
}

/* ================================================
   FOOTER
   ================================================ */
footer {
  background: var(--surface);
  border-top: 1px solid var(--gray-200);
  padding: 24px 28px;
  text-align: center;
  font-size: .8rem;
  color: var(--muted);
  line-height: 1.7;
}

footer a { color: var(--primary-dark); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ================================================
   HERO
   ================================================ */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #0369A1 0%, #0EA5E9 60%, #38BDF8 100%);
  border-radius: var(--radius-xl);
  padding: 52px 52px 48px;
  margin-bottom: 44px;
  color: white;
}

.hero::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 320px; height: 320px;
  background: rgba(255,255,255,.07);
  border-radius: 50%;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -80px; left: 30%;
  width: 240px; height: 240px;
  background: rgba(255,255,255,.05);
  border-radius: 50%;
}

.hero-inner { position: relative; z-index: 1; max-width: 600px; }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,.18);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .5px;
  text-transform: uppercase;
  margin-bottom: 16px;
  color: rgba(255,255,255,.95);
}

.hero h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -.5px;
  line-height: 1.2;
  margin-bottom: 14px;
}

.hero p {
  font-size: 1.05rem;
  opacity: .88;
  line-height: 1.65;
}

/* ================================================
   SPONSOR BAR
   ================================================ */
.sponsor-bar {
  background: var(--surface);
  border: 1.5px dashed var(--gray-300);
  border-radius: var(--radius);
  padding: 14px 20px;
  text-align: center;
  font-size: .8rem;
  color: var(--muted);
  margin-bottom: 40px;
}

.sponsor-bar a { color: var(--primary-dark); font-weight: 500; }

/* ================================================
   SECTION LABELS
   ================================================ */
.section-label {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gray-400);
  margin: 36px 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gray-200);
}

.section-label:first-child { margin-top: 0; }

/* ================================================
   TOOL CARDS GRID
   ================================================ */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(272px, 1fr));
  gap: 16px;
}

.tool-card {
  background: var(--surface);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 22px 22px 20px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tool-card:not(.tool-card--disabled):hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--primary);
}

.tool-card--disabled { opacity: .5; cursor: default; }

.tool-card-icon {
  font-size: 1.6rem;
  line-height: 1;
  margin-bottom: 6px;
  display: block;
}

.tool-card h3 { font-size: .95rem; font-weight: 600; color: var(--gray-800); }
.tool-card p  { font-size: .82rem; color: var(--muted); line-height: 1.5; }

.tool-badge {
  display: inline-block;
  font-size: .68rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 20px;
  margin-top: 8px;
  align-self: flex-start;
  text-transform: uppercase;
  letter-spacing: .4px;
}

.badge-calculator { background: #DBEAFE; color: #1D4ED8; }
.badge-scale      { background: #EDE9FE; color: #5B21B6; }
.badge-guide      { background: #D1FAE5; color: #065F46; }
.badge-coming     { background: var(--gray-100); color: var(--gray-400); }

/* ================================================
   BREADCRUMB
   ================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .8rem;
  color: var(--muted);
  margin-bottom: 22px;
}

.breadcrumb a { color: var(--primary-dark); text-decoration: none; font-weight: 500; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb-sep { color: var(--gray-300); }

/* ================================================
   PAGE HEADER
   ================================================ */
.page-header { margin-bottom: 32px; }

.page-header h1 {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -.4px;
  color: var(--gray-900);
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-header p {
  color: var(--muted);
  margin-top: 6px;
  font-size: .92rem;
}

/* ================================================
   TABS
   ================================================ */
.tabs-wrapper {
  background: var(--surface);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 5px;
  display: inline-flex;
  gap: 4px;
  margin-bottom: 28px;
  box-shadow: var(--shadow-xs);
}

.tab-btn {
  background: none;
  border: none;
  padding: 8px 20px;
  font-size: .875rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  font-family: inherit;
}

.tab-btn:hover { color: var(--gray-700); background: var(--gray-50); }

.tab-btn.active {
  background: var(--primary);
  color: white;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(14,165,233,.35);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ================================================
   CALC LAYOUT
   ================================================ */
.calc-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 720px;
}

/* ================================================
   CARD
   ================================================ */
.card {
  background: var(--surface);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}

.card-title {
  font-size: .875rem;
  font-weight: 700;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: .6px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-title-icon { font-size: 1rem; }

/* ================================================
   FORM FIELDS
   ================================================ */
.field { margin-bottom: 14px; }
.field:last-child { margin-bottom: 0; }

.field label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 6px;
}

.field label .required { color: var(--danger); }
.field label .hint { color: var(--gray-400); font-weight: 400; }

.field input[type="number"],
.field input[type="text"] {
  width: 100%;
  padding: 9px 13px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  color: var(--text);
  background: var(--gray-50);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  font-family: inherit;
  -moz-appearance: textfield;
}

.field input::-webkit-outer-spin-button,
.field input::-webkit-inner-spin-button { -webkit-appearance: none; }

.field input:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--surface);
  box-shadow: 0 0 0 3px rgba(14,165,233,.12);
}

.field input:disabled {
  background: var(--gray-100);
  color: var(--gray-400);
  cursor: not-allowed;
  border-color: var(--gray-200);
}

.field .input-hint {
  font-size: .75rem;
  color: var(--gray-400);
  margin-top: 4px;
}

.field .error-msg {
  font-size: .75rem;
  color: var(--danger);
  margin-top: 4px;
  display: none;
}

.field.has-error input  { border-color: var(--danger); }
.field.has-error .error-msg { display: block; }

.fields-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

/* ================================================
   TOGGLE SWITCH
   ================================================ */
.toggle-row {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  padding: 4px 0;
}

.toggle-row span {
  font-size: .875rem;
  font-weight: 500;
  color: var(--gray-700);
}

.toggle {
  position: relative;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--gray-300);
  border-radius: 22px;
  transition: background var(--transition);
  cursor: pointer;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  left: 3px; top: 3px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition);
  box-shadow: 0 1px 3px rgba(0,0,0,.18);
}

.toggle input:checked + .toggle-slider { background: var(--primary); }
.toggle input:checked + .toggle-slider::before { transform: translateX(18px); }

/* ================================================
   PHASE CARDS
   ================================================ */
.phases-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 10px; }

.phase-card {
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 14px 16px;
  background: var(--gray-50);
}

.phase-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.phase-card-header strong {
  font-size: .82rem;
  font-weight: 700;
  color: var(--primary-dark);
  text-transform: uppercase;
  letter-spacing: .4px;
}

.btn-remove-phase {
  background: none;
  border: none;
  color: var(--gray-400);
  cursor: pointer;
  padding: 3px 6px;
  border-radius: 4px;
  font-size: .8rem;
  line-height: 1;
  transition: color var(--transition), background var(--transition);
}

.btn-remove-phase:hover { color: var(--danger); background: var(--danger-light); }

/* ================================================
   BUTTONS
   ================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-family: inherit;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}

.btn:active { transform: scale(.98); }

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  width: 100%;
  padding: 12px;
  font-size: .92rem;
  box-shadow: 0 2px 8px rgba(14,165,233,.30);
}

.btn-primary:hover {
  box-shadow: 0 4px 14px rgba(14,165,233,.40);
  transform: translateY(-1px);
}

.btn-outline {
  background: var(--surface);
  border: 1.5px solid var(--gray-200);
  color: var(--gray-600);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  background: var(--primary-light);
}

.btn-sm { padding: 6px 13px; font-size: .8rem; }

/* ================================================
   DIVIDER
   ================================================ */
.or-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 4px 0;
  font-size: .75rem;
  color: var(--gray-400);
  font-weight: 500;
}

.or-divider::before,
.or-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gray-200);
}

/* ================================================
   RESULTS
   ================================================ */
.results-card {
  background: linear-gradient(135deg, #F0F9FF 0%, #E0F2FE 100%);
  border: 1.5px solid var(--primary-mid);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  box-shadow: 0 4px 20px rgba(14,165,233,.1);
}

.results-title {
  font-size: .95rem;
  font-weight: 700;
  color: var(--primary-darker);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 7px 0;
  font-size: .875rem;
  gap: 12px;
  border-bottom: 1px solid rgba(186,230,253,.6);
}

.result-row:last-child { border-bottom: none; }

.result-label { color: var(--gray-500); flex-shrink: 0; }
.result-value  { font-weight: 600; color: var(--gray-800); text-align: right; }

.results-divider {
  border: none;
  border-top: 1.5px dashed var(--primary-mid);
  margin: 6px 0;
}

.result-row.total .result-label { font-weight: 700; color: var(--primary-darker); }
.result-row.total .result-value  { font-weight: 800; color: var(--primary-darker); font-size: .95rem; }

/* ================================================
   ALERTS
   ================================================ */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: .83rem;
  line-height: 1.5;
  margin-top: 10px;
}

.alert-warning {
  background: var(--warning-light);
  border: 1px solid var(--warning-border);
  color: #78350F;
}

.alert-success {
  background: var(--success-light);
  border: 1px solid var(--success-border);
  color: #14532D;
}

.alert-info {
  background: var(--primary-light);
  border: 1px solid var(--primary-mid);
  color: var(--primary-darker);
}

.alert-icon { font-size: .95rem; flex-shrink: 0; margin-top: 1px; }

/* ================================================
   DISCLAIMER
   ================================================ */
.disclaimer {
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: .78rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin-top: 40px;
  max-width: 720px;
}

.disclaimer strong { color: var(--gray-600); }

/* ================================================
   UTILITIES
   ================================================ */
/* ================================================
   CLINICAL INFO CARD
   ================================================ */
.clinical-info-card {
  background: var(--surface);
  border: 1.5px solid var(--gray-200);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 18px 22px;
  margin-bottom: 28px;
  max-width: 720px;
  box-shadow: var(--shadow-xs);
}

.ci-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 28px;
}

.ci-label {
  font-size: .68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .7px;
  color: var(--primary-dark);
  margin-bottom: 3px;
}

.ci-text {
  font-size: .82rem;
  color: var(--muted);
  line-height: 1.55;
}

[data-theme="dark"] .clinical-info-card {
  background: #1E293B;
  border-color: #334155;
  border-left-color: var(--primary);
}

@media (max-width: 600px) {
  .ci-grid { grid-template-columns: 1fr; }
}

/* ================================================
   COPY BUTTON
   ================================================ */
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 18px;
  padding: 8px 16px;
  background: var(--surface);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .8rem;
  font-weight: 600;
  color: var(--gray-500);
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.copy-btn:hover {
  background: var(--gray-50);
  border-color: var(--primary);
  color: var(--primary-dark);
}

.copy-btn--done {
  background: var(--success-light);
  border-color: var(--success-border);
  color: var(--success);
}

[data-theme="dark"] .copy-btn {
  background: #263347;
  border-color: #334155;
  color: #94A3B8;
}

[data-theme="dark"] .copy-btn:hover {
  border-color: var(--primary);
  color: #38BDF8;
}

[data-theme="dark"] .copy-btn--done {
  background: rgba(16,185,129,.15);
  border-color: rgba(16,185,129,.3);
  color: #6EE7B7;
}

/* ================================================
   DARK MODE
   ================================================ */
[data-theme="dark"] {
  --bg:      #0F172A;
  --surface: #1E293B;
  --text:    #F1F5F9;
  --muted:   #94A3B8;

  --gray-50:  #1E293B;
  --gray-100: #263347;
  --gray-200: #334155;
  --gray-300: #475569;
  --gray-400: #64748B;
  --gray-500: #94A3B8;
  --gray-600: #CBD5E1;
  --gray-700: #E2E8F0;
  --gray-800: #F1F5F9;
  --gray-900: #F8FAFC;

  --primary-light: rgba(14,165,233,.12);
  --primary-mid:   rgba(14,165,233,.28);

  --border: #334155;

  --shadow-xs: 0 1px 2px rgba(0,0,0,.3);
  --shadow-sm: 0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
  --shadow:    0 4px 6px rgba(0,0,0,.3), 0 2px 4px rgba(0,0,0,.2);
  --shadow-md: 0 10px 15px rgba(0,0,0,.4), 0 4px 6px rgba(0,0,0,.3);
}

/* Nav */
[data-theme="dark"] nav {
  background: rgba(15,23,42,.92);
  border-bottom-color: #334155;
}

/* Logo in dark mode */
[data-theme="dark"] .logo-derm   { color: #E2E8F0; }
[data-theme="dark"] .logo-ate    { color: #38BDF8; }
[data-theme="dark"] .logo-dotapp { color: #38BDF8; -webkit-text-fill-color: #38BDF8; }
[data-theme="dark"] .logo-m {
  background: linear-gradient(to right, #E2E8F0 50%, #38BDF8 50%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Sidebar */
[data-theme="dark"] .sidebar,
[data-theme="dark"] .sb-header { background: #1E293B; }
[data-theme="dark"] .sb-header { border-bottom-color: #334155; }
[data-theme="dark"] .sb-disease:hover { background: #263347; }
[data-theme="dark"] .sb-tool:hover,
[data-theme="dark"] .sb-tool--current { background: rgba(14,165,233,.15); }

/* Cards */
[data-theme="dark"] .card,
[data-theme="dark"] .phase-card { background: #1E293B; border-color: #334155; }

/* Inputs */
[data-theme="dark"] .field input[type="number"],
[data-theme="dark"] .field input[type="text"] {
  background: #0F172A;
  border-color: #334155;
  color: #F1F5F9;
}
[data-theme="dark"] .field input:focus {
  background: #1E293B;
  border-color: var(--primary);
}
[data-theme="dark"] .field input:disabled {
  background: #263347;
  color: #64748B;
}

/* Results */
[data-theme="dark"] .results-card {
  background: linear-gradient(135deg, #0F2744 0%, #0C3358 100%);
  border-color: rgba(14,165,233,.35);
}
[data-theme="dark"] .result-row { border-bottom-color: rgba(14,165,233,.15); }

/* Tabs */
[data-theme="dark"] .tabs-wrapper {
  background: #1E293B;
  border-color: #334155;
}
[data-theme="dark"] .tab-btn:hover { background: #263347; color: #E2E8F0; }

/* Alerts */
[data-theme="dark"] .alert-info {
  background: rgba(14,165,233,.1);
  border-color: rgba(14,165,233,.3);
  color: #7DD3FC;
}
[data-theme="dark"] .alert-warning {
  background: rgba(245,158,11,.1);
  border-color: rgba(245,158,11,.3);
  color: #FCD34D;
}
[data-theme="dark"] .alert-success {
  background: rgba(16,185,129,.1);
  border-color: rgba(16,185,129,.3);
  color: #6EE7B7;
}

/* Disclaimer */
[data-theme="dark"] .disclaimer {
  background: #1E293B;
  border-color: #334155;
  color: #64748B;
}

/* Footer */
[data-theme="dark"] footer {
  background: #1E293B;
  border-top-color: #334155;
}

/* Sponsor bar */
[data-theme="dark"] .sponsor-bar {
  background: #1E293B;
  border-color: #334155;
  color: #64748B;
}

/* Btn outline */
[data-theme="dark"] .btn-outline {
  background: #1E293B;
  border-color: #334155;
  color: #CBD5E1;
}
[data-theme="dark"] .btn-outline:hover {
  background: #263347;
  border-color: var(--primary);
  color: #38BDF8;
}

/* Nav controls wrapper (language + theme toggles) */
.nav-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* Language toggle button */
.lang-toggle {
  background: none;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .4px;
  cursor: pointer;
  color: var(--gray-500);
  font-family: inherit;
  line-height: 1;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  flex-shrink: 0;
}
.lang-toggle:hover {
  background: var(--gray-100);
  border-color: var(--gray-300);
  color: var(--gray-700);
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
  font-size: .9rem;
  cursor: pointer;
  line-height: 1;
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}
.theme-toggle:hover { background: var(--gray-100); border-color: var(--gray-300); }

/* Dark mode — language & theme toggles */
[data-theme="dark"] .lang-toggle {
  border-color: #334155;
  color: #94A3B8;
}
[data-theme="dark"] .lang-toggle:hover {
  background: #263347;
  border-color: #475569;
  color: #CBD5E1;
}

/* ================================================
   BODY REGIONS GRID (SCORAD — Part A)
   ================================================ */
.body-regions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.region-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 13px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: var(--gray-50);
  cursor: pointer;
  user-select: none;
  transition: border-color var(--transition), background var(--transition);
}

.region-card:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.region-card--active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.region-name {
  font-size: .82rem;
  font-weight: 500;
  color: var(--gray-700);
  line-height: 1.3;
}

.region-card--active .region-name { color: var(--primary-dark); font-weight: 600; }

.region-pct {
  flex-shrink: 0;
  font-size: .72rem;
  font-weight: 700;
  color: var(--primary-dark);
  background: rgba(14,165,233,.1);
  border: 1px solid var(--primary-mid);
  border-radius: 10px;
  padding: 2px 8px;
  transition: background var(--transition), color var(--transition);
}

.region-card--active .region-pct {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* ================================================
   INTENSITY SIGNS (SCORAD — Part B)
   ================================================ */
.intensity-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--gray-100);
}

.intensity-row:last-child { border-bottom: none; }

.intensity-label {
  font-size: .855rem;
  font-weight: 500;
  color: var(--gray-700);
  flex: 1;
}

.score-btns { display: flex; gap: 5px; }

.score-btn {
  width: 34px;
  height: 34px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--gray-500);
  font-size: .82rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.score-btn:hover {
  border-color: var(--primary);
  color: var(--primary-dark);
  background: var(--primary-light);
}

.score-btn--active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
  box-shadow: 0 2px 6px rgba(14,165,233,.3);
}

/* ================================================
   RANGE SLIDERS (SCORAD — Part C)
   ================================================ */
.slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: .7rem;
  color: var(--gray-400);
  margin-top: 5px;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 5px;
  border-radius: 3px;
  background: var(--gray-200);
  outline: none;
  cursor: pointer;
  flex: 1;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 1px 5px rgba(14,165,233,.4);
}

input[type="range"]::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 1px 5px rgba(14,165,233,.4);
}

/* ================================================
   SEVERITY BADGE
   ================================================ */
.severity-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .3px;
}

.result-badge--mild     { background: var(--success-light); color: #065F46; border: 1px solid var(--success-border); }
.result-badge--moderate { background: var(--warning-light);  color: #78350F; border: 1px solid var(--warning-border); }
.result-badge--severe   { background: #FEF2F2;               color: #991B1B; border: 1px solid #FECACA; }

/* ================================================
   REFERENCES LIST
   ================================================ */
.references-list {
  list-style: decimal;
  padding-left: 18px;
  margin: 0;
}

.references-list li {
  font-size: .78rem;
  color: var(--muted);
  line-height: 1.65;
  padding: 5px 0;
  border-bottom: 1px solid var(--gray-100);
}

.references-list li:last-child { border-bottom: none; }
.references-list em { font-style: italic; }

/* ── Dark mode — SCORAD components ── */
[data-theme="dark"] .region-card {
  background: #1E293B;
  border-color: #334155;
}
[data-theme="dark"] .region-card:hover,
[data-theme="dark"] .region-card--active {
  background: rgba(14,165,233,.12);
  border-color: var(--primary);
}
[data-theme="dark"] .region-pct {
  background: rgba(14,165,233,.15);
  border-color: rgba(14,165,233,.25);
  color: #38BDF8;
}
[data-theme="dark"] .region-card--active .region-pct {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
[data-theme="dark"] .score-btn {
  background: #1E293B;
  border-color: #334155;
  color: #94A3B8;
}
[data-theme="dark"] .score-btn:hover {
  background: rgba(14,165,233,.15);
  border-color: var(--primary);
  color: #38BDF8;
}
[data-theme="dark"] .intensity-row  { border-bottom-color: #334155; }
[data-theme="dark"] .references-list li { border-bottom-color: #334155; }
[data-theme="dark"] input[type="range"] { background: #334155; }
[data-theme="dark"] .result-badge--mild {
  background: rgba(16,185,129,.15); color: #6EE7B7; border-color: rgba(16,185,129,.3);
}
[data-theme="dark"] .result-badge--moderate {
  background: rgba(245,158,11,.12); color: #FCD34D; border-color: rgba(245,158,11,.3);
}
[data-theme="dark"] .result-badge--severe {
  background: rgba(239,68,68,.12); color: #FCA5A5; border-color: rgba(239,68,68,.3);
}

/* ================================================
   COUNTER WIDGET (IHS4 lesion counts)
   ================================================ */
.counter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--gray-100);
}

.counter-row:last-child { border-bottom: none; }

.counter-info { flex: 1; min-width: 0; }

.counter-name {
  font-size: .875rem;
  font-weight: 500;
  color: var(--gray-700);
  line-height: 1.3;
}

.counter-weight {
  font-size: .72rem;
  color: var(--gray-400);
  margin-top: 2px;
}

.counter-widget {
  display: flex;
  align-items: stretch;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--surface);
  flex-shrink: 0;
}

.counter-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  color: var(--gray-500);
  font-size: 1.15rem;
  font-weight: 400;
  cursor: pointer;
  font-family: inherit;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
  line-height: 1;
}

.counter-btn:hover { background: var(--primary-light); color: var(--primary-dark); }
.counter-btn:active { background: var(--primary-mid); }

.counter-val {
  min-width: 48px;
  text-align: center;
  font-size: .95rem;
  font-weight: 700;
  color: var(--gray-800);
  border-left: 1.5px solid var(--gray-200);
  border-right: 1.5px solid var(--gray-200);
  padding: 0 10px;
  height: 36px;
  line-height: 36px;
  background: var(--gray-50);
  font-family: inherit;
}

/* ================================================
   HURLEY STAGING CARDS
   ================================================ */
.hurley-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.hurley-card {
  padding: 14px 15px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  background: var(--gray-50);
}

.hurley-stage-label {
  font-size: .62rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .9px;
  color: var(--gray-400);
  margin-bottom: 4px;
}

.hurley-stage-num {
  font-size: 1rem;
  font-weight: 800;
  color: var(--gray-800);
  margin-bottom: 8px;
}

.hurley-desc {
  font-size: .78rem;
  color: var(--muted);
  line-height: 1.55;
}

/* Refined Hurley flow */
.refined-hurley-flow {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rh-question {
  background: var(--primary-light);
  border: 1.5px solid var(--primary-mid);
  border-radius: var(--radius);
  padding: 14px 18px;
}

.rh-question-text {
  font-size: .875rem;
  font-weight: 600;
  color: var(--primary-darker);
  margin-bottom: 10px;
}

.rh-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.rh-btn {
  padding: 7px 18px;
  border: 1.5px solid var(--primary-mid);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--primary-dark);
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition), border-color var(--transition);
}

.rh-btn:hover { background: var(--primary); color: white; border-color: var(--primary); }
.rh-btn--active { background: var(--primary); color: white; border-color: var(--primary); }

.rh-result {
  border-radius: var(--radius);
  padding: 18px 20px;
  border: 1.5px solid;
}

.rh-result--mild     { background: var(--success-light); border-color: var(--success-border); }
.rh-result--moderate { background: var(--warning-light);  border-color: var(--warning-border); }
.rh-result--severe   { background: #FEF2F2;               border-color: #FECACA; }

.rh-result-stage {
  font-size: .7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .7px;
  margin-bottom: 5px;
}

.rh-result--mild .rh-result-stage     { color: #065F46; }
.rh-result--moderate .rh-result-stage { color: #78350F; }
.rh-result--severe .rh-result-stage   { color: #991B1B; }

.rh-result-title {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 6px;
}

.rh-result--mild .rh-result-title     { color: #065F46; }
.rh-result--moderate .rh-result-title { color: #78350F; }
.rh-result--severe .rh-result-title   { color: #991B1B; }

.rh-result-desc {
  font-size: .82rem;
  line-height: 1.55;
}

.rh-result--mild .rh-result-desc     { color: #064E3B; }
.rh-result--moderate .rh-result-desc { color: #78350F; }
.rh-result--severe .rh-result-desc   { color: #7F1D1D; }

.rh-reset-btn {
  margin-top: 14px;
  padding: 7px 16px;
  background: none;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: .8rem;
  font-weight: 600;
  color: var(--gray-500);
  cursor: pointer;
  font-family: inherit;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.rh-reset-btn:hover { background: var(--gray-100); border-color: var(--gray-300); color: var(--gray-700); }

/* ── Dark mode — counter & hurley ── */
[data-theme="dark"] .counter-widget { border-color: #334155; background: #1E293B; }
[data-theme="dark"] .counter-btn  { color: #94A3B8; }
[data-theme="dark"] .counter-btn:hover { background: rgba(14,165,233,.15); color: #38BDF8; }
[data-theme="dark"] .counter-val  { background: #0F172A; border-color: #334155; color: #F1F5F9; }
[data-theme="dark"] .counter-row  { border-bottom-color: #334155; }

[data-theme="dark"] .hurley-card  { background: #1E293B; border-color: #334155; }
[data-theme="dark"] .hurley-stage-num { color: #E2E8F0; }

[data-theme="dark"] .rh-question {
  background: rgba(14,165,233,.08);
  border-color: rgba(14,165,233,.25);
}
[data-theme="dark"] .rh-question-text { color: #7DD3FC; }
[data-theme="dark"] .rh-btn {
  background: #1E293B;
  border-color: rgba(14,165,233,.3);
  color: #7DD3FC;
}
[data-theme="dark"] .rh-btn:hover,
[data-theme="dark"] .rh-btn--active { background: var(--primary); color: white; border-color: var(--primary); }

[data-theme="dark"] .rh-result--mild {
  background: rgba(16,185,129,.1); border-color: rgba(16,185,129,.25);
}
[data-theme="dark"] .rh-result--moderate {
  background: rgba(245,158,11,.1); border-color: rgba(245,158,11,.25);
}
[data-theme="dark"] .rh-result--severe {
  background: rgba(239,68,68,.1); border-color: rgba(239,68,68,.25);
}
[data-theme="dark"] .rh-result--mild .rh-result-stage,
[data-theme="dark"] .rh-result--mild .rh-result-title,
[data-theme="dark"] .rh-result--mild .rh-result-desc { color: #6EE7B7; }
[data-theme="dark"] .rh-result--moderate .rh-result-stage,
[data-theme="dark"] .rh-result--moderate .rh-result-title,
[data-theme="dark"] .rh-result--moderate .rh-result-desc { color: #FCD34D; }
[data-theme="dark"] .rh-result--severe .rh-result-stage,
[data-theme="dark"] .rh-result--severe .rh-result-title,
[data-theme="dark"] .rh-result--severe .rh-result-desc { color: #FCA5A5; }

@media (max-width: 640px) {
  .hurley-grid { grid-template-columns: 1fr; }
}

/* ================================================
   UTILITIES
   ================================================ */
.hidden  { display: none !important; }
.mt-8    { margin-top: 8px; }
.mt-12   { margin-top: 12px; }
.mt-16   { margin-top: 16px; }
.mt-20   { margin-top: 20px; }
.mt-24   { margin-top: 24px; }

/* ================================================
   RESPONSIVE
   ================================================ */
@media (max-width: 640px) {
  .nav-links { display: none; }
  main { padding: 24px 16px 56px; }

  .hero { padding: 32px 24px 28px; border-radius: var(--radius-lg); }
  .hero h1 { font-size: 1.6rem; }
  .hero p  { font-size: .95rem; }

  .fields-row { grid-template-columns: 1fr; gap: 0; }

  .tabs-wrapper { width: 100%; }
  .tab-btn { flex: 1; text-align: center; }

  .card { padding: 16px 18px; }
  .results-card { padding: 16px 18px; }

  .page-header h1 { font-size: 1.35rem; }
}

/* ================================================
   PAGE LAYOUT (sidebar + content)
   ================================================ */
.page-layout {
  display: flex;
  align-items: flex-start;
  max-width: 1280px;
  margin: 0 auto;
}

/* ================================================
   SIDEBAR
   ================================================ */
.sidebar {
  width: 240px;
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--gray-200);
  position: sticky;
  top: 62px;                          /* height of navbar */
  height: calc(100vh - 62px);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--gray-200) transparent;
  z-index: 50;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--gray-200); border-radius: 4px; }

.sb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 16px 10px;
  border-bottom: 1px solid var(--gray-100);
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 1;
}

.sb-title {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .9px;
  color: var(--gray-400);
}

.sb-close-btn {
  display: none;            /* only shown on mobile */
  background: none;
  border: none;
  font-size: .85rem;
  color: var(--gray-400);
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 4px;
  line-height: 1;
  transition: color var(--transition), background var(--transition);
}

.sb-close-btn:hover { color: var(--gray-700); background: var(--gray-100); }

.sb-nav { padding: 8px 0 24px; }

/* Letter groups */
.sb-letter-group { padding: 0 0 4px; }

.sb-letter {
  display: block;
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--gray-300);
  padding: 8px 16px 3px;
  user-select: none;
}

.sb-letter-empty .sb-letter { color: var(--gray-200); }

/* Disease toggle button */
.sb-disease {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  background: none;
  border: none;
  padding: 6px 16px 6px 12px;
  font-size: .855rem;
  font-weight: 500;
  color: var(--gray-700);
  cursor: pointer;
  text-align: left;
  border-radius: 0;
  font-family: inherit;
  transition: background var(--transition), color var(--transition);
}

.sb-disease:hover { background: var(--gray-50); color: var(--gray-900); }

.sb-disease--active { color: var(--primary-dark); font-weight: 600; }

/* Arrow icon */
.sb-arrow {
  width: 10px;
  height: 10px;
  flex-shrink: 0;
  color: var(--gray-400);
  transition: transform var(--transition);
}

.sb-arrow--open { transform: rotate(90deg); }

/* Tool links list */
.sb-tools {
  list-style: none;
  padding: 2px 0 4px 28px;
  margin: 0;
}

.sb-tool {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 5px 12px 5px 8px;
  text-decoration: none;
  color: var(--gray-500);
  font-size: .815rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
  margin: 1px 0;
}

.sb-tool:hover { background: var(--primary-light); color: var(--primary-dark); }

.sb-tool--current {
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 600;
}

.sb-tool-name { flex: 1; line-height: 1.4; }

/* ── Main content area ── */
.page-content {
  flex: 1;
  min-width: 0;
  padding: 40px 32px 80px;
}

/* ── Mobile sidebar overlay ── */
.sb-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 49;
}

/* ── Hamburger button (nav, mobile only) ── */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  padding: 6px 8px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--gray-600);
  transition: background var(--transition);
}

.nav-hamburger:hover { background: var(--gray-100); }

.nav-hamburger svg { display: block; }

/* ================================================
   RESPONSIVE — SIDEBAR
   ================================================ */
@media (max-width: 900px) {
  /* Show hamburger */
  .nav-hamburger { display: flex; align-items: center; }

  /* Sidebar becomes a drawer */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform .25s ease;
    box-shadow: var(--shadow-lg);
    z-index: 200;
  }

  .sidebar.sb--open { transform: translateX(0); }

  .sb-close-btn { display: flex; align-items: center; }

  .page-content { padding: 24px 16px 56px; }
}

@media (max-width: 640px) {
  .page-content { padding: 20px 14px 56px; }
}