/* Mobile-first responsive design with dark theme */
:root {
  --bg-primary: #0b0c10;
  --bg-secondary: #121318;
  --bg-tertiary: #10121a;
  --border-color: #1d2030;
  --border-light: #262a3e;
  --text-primary: #e9edf1;
  --text-secondary: #cbd3df;
  --text-muted: #95a1b3;
  --text-footer: #8e99ab;
  --accent-blue: #2563eb;
  --accent-blue-light: #6ea8fe;
  --accent-cyan: #06b6d4;
  --success: #059669;
  --danger: #ef4444;
  --warning: #f59e0b;
  --shadow: rgba(13, 110, 253, 0.15);
}

/* Base styles */
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
}

/* Layout */
.app-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem;
}

@media (min-width: 768px) {
  .app-shell {
    padding: 2rem;
  }
}

/* Navbar styles */
.navbar-brand {
  font-size: 1.25rem;
  font-weight: 700;
}

.navbar-nav .nav-link {
  font-weight: 500;
  transition: color 0.2s ease;
}

.navbar-nav .nav-link:hover {
  color: var(--accent-blue-light) !important;
}

.navbar-nav .nav-link.active {
  color: var(--accent-blue-light) !important;
}

/* Page-specific styles */
.container {
  max-width: 1200px;
}

/* Hero section */
.display-4 {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Card enhancements */
.card {
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

/* Alert styles */
.alert {
  border-radius: 0.5rem;
}

.alert-info {
  background: rgba(13, 202, 240, 0.1);
  border-color: rgba(13, 202, 240, 0.3);
  color: #9ec1ff;
}

.alert-warning {
  background: rgba(255, 193, 7, 0.1);
  border-color: rgba(255, 193, 7, 0.3);
  color: #ffd43b;
}

/* Blockquote styles */
.blockquote {
  border-left: 4px solid var(--accent-blue);
  padding-left: 1rem;
  margin: 1.5rem 0;
}

/* Badge enhancements */
.badge {
  font-weight: 600;
}

/* Button enhancements */
.btn {
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

/* Footer */
footer {
  margin-top: 3rem;
}

/* Responsive adjustments for new pages */
@media (max-width: 767px) {
  .display-4 {
    font-size: 2.5rem;
  }
  
  .display-5 {
    font-size: 2rem;
  }
  
  .lead {
    font-size: 1.1rem;
  }
  
  .card-body {
    padding: 1.5rem;
  }
}

/* Typography */
.brand {
  letter-spacing: 0.5px;
  font-weight: 600;
}

.small-muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Fix small text visibility - make it whiter and more readable */
.small {
  color: #e2e8f0 !important;
  font-size: 0.875rem !important;
  opacity: 1 !important;
}

.text-muted {
  color: #e2e8f0 !important;
  opacity: 1 !important;
}

.text-muted.small {
  color: #e2e8f0 !important;
  opacity: 1 !important;
  font-size: 0.875rem !important;
}

/* Ensure all small text is visible and readable */
p.small, p.text-muted, .small, .text-muted {
  color: #e2e8f0 !important;
  opacity: 1 !important;
}

.footer-note {
  color: var(--text-footer);
  font-size: 0.85rem;
}

/* Cards */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.card-header {
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  border-radius: 0.5rem 0.5rem 0 0 !important;
}

/* Form controls */
.form-control,
.form-select {
  background: #0e0f14;
  color: var(--text-primary);
  border-color: var(--border-light);
  border-radius: 0.375rem;
}

.form-control:focus,
.form-select:focus {
  background: #0e0f14;
  border-color: var(--accent-blue-light);
  box-shadow: 0 0 0 0.2rem var(--shadow);
  color: var(--text-primary);
}

.form-control::placeholder {
  color: var(--text-muted);
}

.form-label {
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

/* Buttons */
.btn-outline-secondary {
  border-color: #353a55;
  color: var(--text-secondary);
  background: transparent;
}

.btn-outline-secondary:hover {
  background: #21243a;
  color: #fff;
  border-color: #353a55;
}

.btn-primary {
  background: var(--accent-blue);
  border-color: #1e40af;
}

.btn-primary:hover {
  background: #1d4ed8;
  border-color: #1e40af;
}

.btn-success {
  background: var(--success);
  border-color: #047857;
}

.btn-danger {
  background: var(--danger);
  border-color: #b91c1c;
}

/* Badges */
.badge-soft {
  background: rgba(37, 99, 235, 0.15);
  color: #9ec1ff;
  border: 1px solid rgba(37, 99, 235, 0.3);
  font-weight: 500;
}

/* Stepper navigation */
.stepper .nav-link {
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  background: transparent;
  border-radius: 0.375rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.stepper .nav-link:hover {
  background: #1a1d2b;
  color: var(--text-primary);
  border-color: #2a2f4f;
}

.stepper .nav-link.active {
  background: #1a1d2b;
  color: #fff;
  border-color: #2a2f4f;
}

.stepper .nav-link.completed {
  color: #a6f3c6;
  border-color: #36d399;
}

.stepper .nav-link.completed:hover {
  background: rgba(54, 211, 153, 0.1);
}

/* Progress bar */
.progress {
  background: #171a26;
  height: 0.5rem;
  border-radius: 0.25rem;
}

.progress-bar {
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  border-radius: 0.25rem;
  transition: width 0.3s ease;
}

/* Dynamic row layouts */
.kv-row {
  display: grid;
  grid-template-columns: 1fr 120px 44px;
  gap: 0.5rem;
  align-items: center;
}

.def-row {
  display: grid;
  grid-template-columns: 1.2fr 2fr 44px;
  gap: 0.5rem;
  align-items: center;
}

.test-row {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 130px 44px;
  gap: 0.5rem;
  align-items: center;
}

.assump-row {
  display: grid;
  grid-template-columns: 1fr 130px 44px;
  gap: 0.5rem;
  align-items: center;
}

/* Mobile responsive adjustments */
@media (max-width: 767px) {
  .kv-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .kv-row > *:last-child {
    grid-column: 1;
    justify-self: start;
  }
  
  .def-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .def-row > *:last-child {
    grid-column: 1;
    justify-self: start;
  }
  
  .test-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .test-row > *:last-child {
    grid-column: 1;
    justify-self: start;
  }
  
  .assump-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .assump-row > *:last-child {
    grid-column: 1;
    justify-self: start;
  }
  
  .stepper .nav-link {
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
  }
  
  .btn-sm {
    font-size: 0.8rem;
    padding: 0.375rem 0.75rem;
  }
}

@media (max-width: 575px) {
  .app-shell {
    padding: 0.5rem;
  }
  
  .card-body {
    padding: 1rem;
  }
  
  .stepper {
    flex-wrap: wrap;
  }
  
  .stepper .nav-link {
    flex: 1;
    min-width: 0;
    text-align: center;
    font-size: 0.8rem;
    padding: 0.4rem 0.5rem;
  }
}

/* Utility classes */
.hl {
  border-left: 3px solid var(--accent-blue);
  padding-left: 0.75rem;
  margin-bottom: 1rem;
}

.ghost {
  opacity: 0.6;
}

.cursor-move {
  cursor: move;
}

.toxicity {
  color: #fca5a5;
}

/* Print styles */
@media print {
  .no-print {
    display: none !important;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
  
  body {
    background: #fff;
    color: #000;
  }
  
  .stepper {
    display: none;
  }
  
  .btn {
    display: none;
  }
  
  .tab-content {
    display: block !important;
  }
  
  .tab-pane {
    display: block !important;
    opacity: 1 !important;
  }
}

/* Focus and accessibility */
.form-control:focus,
.form-select:focus,
.btn:focus {
  outline: 2px solid var(--accent-blue-light);
  outline-offset: 2px;
}

/* Dropdown menu styles */
.dropdown-menu {
  background: var(--bg-secondary) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 0.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.dropdown-menu.bg-dark {
  background: var(--bg-secondary) !important;
}

.dropdown-item {
  color: #ffffff !important;
  padding: 0.5rem 1rem;
  transition: background-color 0.2s ease;
  background: transparent !important;
}

.dropdown-item:hover {
  background: var(--bg-tertiary) !important;
  color: #ffffff !important;
}

.dropdown-item:focus {
  background: var(--bg-tertiary) !important;
  color: #ffffff !important;
}

/* Ensure dropdown items are visible on mobile */
@media (max-width: 767px) {
  .dropdown-menu {
    background: var(--bg-secondary) !important;
    border: 1px solid var(--border-color) !important;
  }
  
  .dropdown-menu.bg-dark {
    background: var(--bg-secondary) !important;
  }
  
  .dropdown-item {
    color: #ffffff !important;
    background: transparent !important;
  }
  
  .dropdown-item:hover,
  .dropdown-item:focus {
    background: var(--bg-tertiary) !important;
    color: #ffffff !important;
  }
  
  /* Ensure dropdown is properly positioned on mobile */
  .dropdown-menu {
    position: absolute !important;
    z-index: 1000 !important;
    min-width: 200px !important;
  }
}

/* Loading states */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Animation for smooth transitions */
.tab-pane {
  transition: opacity 0.15s ease-in-out;
}

/* Custom range slider */
.form-range {
  background: transparent;
}

.form-range::-webkit-slider-track {
  background: #171a26;
  height: 0.5rem;
  border-radius: 0.25rem;
}

.form-range::-webkit-slider-thumb {
  background: var(--accent-blue);
  border: none;
  height: 1.25rem;
  width: 1.25rem;
  border-radius: 50%;
  cursor: pointer;
}

.form-range::-moz-range-track {
  background: #171a26;
  height: 0.5rem;
  border-radius: 0.25rem;
  border: none;
}

.form-range::-moz-range-thumb {
  background: var(--accent-blue);
  border: none;
  height: 1.25rem;
  width: 1.25rem;
  border-radius: 50%;
  cursor: pointer;
}