:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;
  
  --accent: #ea580c;
  --accent-hover: #c2410c;
  --accent-light: #fff7ed;
  --accent-border: #fed7aa;
  
  --text-main: #0f172a;
  --text-body: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-alt: #f1f5f9;
  
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  
  --success: #10b981;
  --success-light: #ecfdf5;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  
  --sidebar-width: 310px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.15s ease;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* App Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Mobile Topbar */
.mobile-topbar {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 0 16px;
  align-items: center;
  justify-content: space-between;
  z-index: 90;
  box-shadow: var(--shadow-xs);
}

.mobile-brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.mobile-nav-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 5px 9px;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--text-main);
}

/* Left Sidebar */
aside.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  background: #ffffff;
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 16px 12px 20px;
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.sidebar-brand {
  padding: 0 6px 12px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 12px;
}

.sidebar-logo {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.02em;
}

.sidebar-logo:hover {
  text-decoration: none;
}

.sidebar-logo span.badge {
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.7rem;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  border: 1px solid var(--accent-border);
  letter-spacing: 0;
}

.sidebar-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Sidebar Nav Groups */
.nav-group {
  margin-bottom: 12px;
}

.nav-group-title {
  font-size: 0.68rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-light);
  padding: 0 8px;
  margin-bottom: 3px;
}

.sidebar-nav {
  list-style: none;
}

.sidebar-nav li {
  margin-bottom: 1px;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-body);
  text-decoration: none;
  transition: all 0.12s ease;
  white-space: nowrap;
}

.sidebar-nav a:hover {
  background-color: var(--bg-card-alt);
  color: var(--primary);
  text-decoration: none;
}

.sidebar-nav a.active {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.sidebar-nav a .badge-code-sm {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: #e2e8f0;
  color: var(--text-body);
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
  display: inline-block;
  min-width: 60px;
  text-align: center;
}

.sidebar-nav a.active .badge-code-sm {
  background: var(--primary-border);
  color: var(--primary);
}

/* Accordion Nav Item */
.nav-accordion {
  margin-bottom: 2px;
  border-radius: var(--radius-sm);
}

.nav-accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-body);
  cursor: pointer;
  user-select: none;
  transition: all 0.12s ease;
}

.nav-accordion-header:hover {
  background-color: var(--bg-card-alt);
  color: var(--primary);
}

.nav-accordion.open .nav-accordion-header {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.nav-accordion-title {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-accordion-arrow {
  font-size: 0.7rem;
  transition: transform 0.2s ease;
  color: var(--text-muted);
}

.nav-accordion.open .nav-accordion-arrow {
  transform: rotate(90deg);
  color: var(--primary);
}

.nav-accordion-body {
  display: none;
  list-style: none;
  padding: 3px 0 3px 14px;
  margin: 2px 0 4px 6px;
  border-left: 2px solid var(--border-color);
}

.nav-accordion.open .nav-accordion-body {
  display: block;
}

.nav-accordion-body li a {
  padding: 4px 8px;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-accordion-body li a:hover {
  color: var(--primary);
  background-color: var(--bg-card-alt);
}

.nav-accordion-body li a.active {
  color: var(--primary);
  background-color: var(--primary-light);
  font-weight: 600;
}

.sidebar-footer {
  margin-top: auto;
  padding: 10px 6px 0;
  border-top: 1px solid var(--border-color);
  font-size: 0.72rem;
  color: var(--text-light);
  line-height: 1.4;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.4);
  z-index: 95;
  backdrop-filter: blur(2px);
}

/* Main Content Area */
.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.content-container {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 36px 32px 60px;
  flex: 1;
}

/* Typography & Headings */
h1 {
  font-size: 2.1rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.025em;
  margin-bottom: 12px;
  line-height: 1.25;
}

h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.015em;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 24px 0 10px;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 18px 0 8px;
}

p {
  margin-bottom: 16px;
  font-size: 0.98rem;
  color: var(--text-body);
}

ul, ol {
  margin: 0 0 18px 24px;
  color: var(--text-body);
}

li {
  margin-bottom: 8px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: #f1f5f9;
  color: #0f172a;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
}

pre {
  background: #0f172a;
  color: #f8fafc;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 16px 0 20px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
}

pre code {
  background: none;
  color: inherit;
  border: none;
  padding: 0;
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 20px;
}

.breadcrumbs a {
  color: var(--text-muted);
}

.breadcrumbs a:hover {
  color: var(--primary);
}

/* Badges */
.badge-code {
  font-family: var(--font-mono);
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--primary-border);
  white-space: nowrap;
  display: inline-block;
}

.badge-tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: #f1f5f9;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  font-weight: 600;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all 0.15s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
  box-shadow: var(--shadow-xs);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  color: #ffffff;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.btn-accent {
  background-color: var(--accent);
  color: #ffffff;
  box-shadow: var(--shadow-xs);
}

.btn-accent:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.btn-outline {
  background-color: #ffffff;
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-outline:hover {
  background-color: var(--bg-card-alt);
  border-color: var(--border-hover);
  color: var(--text-main);
  text-decoration: none;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* Callout Boxes */
.callout {
  background-color: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin: 24px 0;
  border-top: 1px solid rgba(191, 219, 254, 0.4);
  border-right: 1px solid rgba(191, 219, 254, 0.4);
  border-bottom: 1px solid rgba(191, 219, 254, 0.4);
}

.callout.callout-accent {
  background-color: var(--accent-light);
  border-left-color: var(--accent);
  border-top: 1px solid rgba(254, 215, 170, 0.4);
  border-right: 1px solid rgba(254, 215, 170, 0.4);
  border-bottom: 1px solid rgba(254, 215, 170, 0.4);
}

.callout.callout-muted {
  background-color: #f1f5f9;
  border-left: 4px solid #64748b;
  border-top: 1px solid #e2e8f0;
  border-right: 1px solid #e2e8f0;
  border-bottom: 1px solid #e2e8f0;
}

.callout h4 {
  color: var(--text-main);
  font-size: 1.05rem;
  margin: 0 0 6px;
  font-weight: 700;
}

.callout p {
  color: var(--text-body);
  font-size: 0.9375rem;
  margin-bottom: 0;
}

/* Official Resources Card */
.official-card {
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  border: 1px solid #cbd5e1;
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 32px 0 20px;
  box-shadow: var(--shadow-sm);
}

.official-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.official-card-header h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--text-main);
}

.official-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

/* Tables */
.table-wrapper {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin: 20px 0;
  box-shadow: var(--shadow-xs);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9375rem;
}

table.data-table th {
  background-color: #f8fafc;
  color: var(--text-main);
  padding: 12px 16px;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

table.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-body);
}

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

table.data-table tr:hover {
  background-color: #f8fafc;
}

/* Domain Practice Item & Strikeout Controls */
.domain-practice-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin: 40px 0 24px;
  box-shadow: var(--shadow-sm);
}

.practice-question-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
  background: #ffffff;
}

.practice-question-card:last-child {
  margin-bottom: 0;
}

.practice-qnum {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.practice-scenario-text {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
  line-height: 1.5;
}

.practice-options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.practice-option-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.practice-option-btn {
  flex: 1;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  background: #ffffff;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9375rem;
  color: var(--text-main);
  text-align: left;
  transition: all 0.15s ease;
}

.practice-option-btn:hover:not(:disabled) {
  border-color: #93c5fd;
  background-color: var(--primary-light);
}

.practice-option-btn.strikethrough {
  text-decoration: line-through;
  opacity: 0.45;
  background-color: #f1f5f9;
  border-color: #e2e8f0;
}

.practice-option-btn.correct {
  border-color: var(--success);
  background-color: var(--success-light);
  color: #065f46;
  font-weight: 600;
}

.practice-option-btn.incorrect {
  border-color: var(--danger);
  background-color: var(--danger-light);
  color: #991b1b;
}

.btn-strike {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0 10px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.12s ease;
  user-select: none;
  min-width: 44px;
}

.btn-strike:hover:not(:disabled) {
  background: #fee2e2;
  color: #dc2626;
  border-color: #fca5a5;
}

.btn-strike.active {
  background: #fee2e2;
  color: #dc2626;
  border-color: #f87171;
}

/* Detailed Option Explanation */
.practice-explanation-box {
  display: none;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px;
  margin-top: 16px;
  font-size: 0.92rem;
  color: var(--text-body);
}

.practice-explanation-box.show {
  display: block;
}

.explanation-key-takeaway {
  background: #eff6ff;
  border-left: 3px solid var(--primary);
  padding: 10px 14px;
  border-radius: 4px;
  margin-bottom: 12px;
  font-weight: 500;
  color: #1e40af;
}

.explanation-options-breakdown {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.explanation-item {
  font-size: 0.88rem;
  padding: 6px 10px;
  border-radius: 4px;
}

.explanation-item.is-correct {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.explanation-item.is-incorrect {
  background: #ffffff;
  color: #475569;
  border: 1px solid #e2e8f0;
}

/* Site Footer */
footer.main-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 24px 32px;
  background: #ffffff;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-inner {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* Responsive Media Queries */
@media (max-width: 991px) {
  .mobile-topbar {
    display: flex;
  }
  
  aside.sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-lg);
  }
  
  aside.sidebar.open {
    transform: translateX(0);
  }
  
  .sidebar-overlay.active {
    display: block;
  }
  
  .main-wrapper {
    margin-left: 0;
    padding-top: 56px;
  }
  
  .content-container {
    padding: 24px 16px 48px;
  }
  
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 640px) {
  .content-container {
    padding: 18px 12px 40px;
  }
  
  h1 {
    font-size: 1.55rem;
    line-height: 1.3;
  }
  
  h2 {
    font-size: 1.25rem;
    margin-top: 28px;
  }
  
  /* Advisor cards responsive padding */
  #advisor-app > div {
    padding: 20px 14px !important;
  }
  
  .practice-option-row {
    gap: 6px;
  }
  
  .practice-option-btn {
    padding: 10px 12px;
    font-size: 0.88rem;
  }
  
  .btn-strike {
    min-width: 38px;
    padding: 0 6px;
    font-size: 0.72rem;
  }
  
  /* Smooth touch-scrolling for tables */
  .table-wrapper {
    -webkit-overflow-scrolling: touch;
    margin: 16px 0;
  }
  
  table.data-table th, 
  table.data-table td {
    padding: 10px 12px;
    font-size: 0.85rem;
  }
}