:root,
[data-bs-theme="light"] {
  --lt-primary: #6366f1;
  --lt-primary-hover: #4f46e5;
  --lt-accent: #06b6d4;

  --lt-surface: #ffffff;
  --lt-border: #e2e8f0;
  --lt-code-bg: #f8fafc;
  --lt-hero-bg: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);

  --lt-diff-insert-bg: rgba(34, 197, 94, 0.3);
  --lt-diff-insert-text: #166534;
  --lt-diff-insert-border: rgba(34, 197, 94, 0.5);
  --lt-diff-delete-bg: rgba(239, 68, 68, 0.25);
  --lt-diff-delete-text: #991b1b;
  --lt-diff-delete-border: rgba(239, 68, 68, 0.45);
  --lt-diff-subst-bg: rgba(245, 158, 11, 0.28);
  --lt-diff-subst-text: #92400e;
  --lt-diff-subst-border: rgba(245, 158, 11, 0.5);

  --lt-slider-override: #6366f1;
  --lt-slider-default: #cbd5e1;

  --bs-primary: #6366f1;
  --bs-primary-rgb: 99, 102, 241;
}

[data-bs-theme="dark"] {
  --lt-primary: #818cf8;
  --lt-primary-hover: #a5b4fc;
  --lt-accent: #22d3ee;

  --lt-surface: #1e293b;
  --lt-border: #334155;
  --lt-code-bg: #0f172a;
  --lt-hero-bg: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);

  --lt-diff-insert-bg: rgba(34, 197, 94, 0.35);
  --lt-diff-insert-text: #86efac;
  --lt-diff-insert-border: rgba(34, 197, 94, 0.55);
  --lt-diff-delete-bg: rgba(239, 68, 68, 0.32);
  --lt-diff-delete-text: #fca5a5;
  --lt-diff-delete-border: rgba(239, 68, 68, 0.5);
  --lt-diff-subst-bg: rgba(245, 158, 11, 0.35);
  --lt-diff-subst-text: #fcd34d;
  --lt-diff-subst-border: rgba(245, 158, 11, 0.55);

  --lt-slider-override: #818cf8;
  --lt-slider-default: #475569;

  --bs-primary: #818cf8;
  --bs-primary-rgb: 129, 140, 248;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.font-monospace,
code,
pre,
.lt-output,
.lt-code-block {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 9999;
  padding: 0.5rem 1rem;
  background: var(--bs-primary);
  color: white;
}

.skip-link:focus {
  top: 0;
}

#hero {
  background: var(--lt-hero-bg);
  min-height: 60vh;
  display: flex;
  align-items: center;
}

.section-heading {
  margin-bottom: 1.5rem;
}

#input-text {
  resize: vertical;
}

.lt-output {
  background-color: var(--lt-code-bg);
  border: 1px solid var(--lt-border);
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.7;
  font-size: 0.9rem;
  min-height: 10rem;
  overflow-y: auto;
  resize: none;
}

.diff-insert {
  background-color: var(--lt-diff-insert-bg);
  color: var(--lt-diff-insert-text);
  border-bottom: 2px solid var(--lt-diff-insert-border);
  border-radius: 2px;
  padding: 0 2px;
}

.diff-delete {
  background-color: var(--lt-diff-delete-bg);
  color: var(--lt-diff-delete-text);
  border-bottom: 2px solid var(--lt-diff-delete-border);
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  border-radius: 2px;
  padding: 0 2px;
}

.diff-substitute {
  background-color: var(--lt-diff-subst-bg);
  color: var(--lt-diff-subst-text);
  border-bottom: 2px solid var(--lt-diff-subst-border);
  border-radius: 2px;
  padding: 0 2px;
  font-weight: 600;
}

.advanced-chevron {
  transition: transform 0.2s ease;
  display: inline-block;
}

[aria-expanded="true"] .advanced-chevron {
  transform: rotate(90deg);
}

.nav-tabs-sm .nav-link {
  font-size: 0.82rem;
  padding: 0.35rem 0.75rem;
}

.weight-slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.weight-slider-row label {
  min-width: 140px;
  font-size: 0.85rem;
}

.weight-slider-row .form-range {
  flex: 1;
}

.weight-slider-row .weight-value {
  min-width: 3rem;
  text-align: right;
  font-size: 0.85rem;
  font-family: "SFMono-Regular", Consolas, monospace;
}

.override-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--lt-slider-override);
  display: inline-block;
  margin-left: 4px;
}

input[type="range"] {
  min-height: 44px;
}

.card.border-0.shadow-sm {
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card.border-0.shadow-sm:hover {
  transform: translateY(-2px);
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1) !important;
}

#typing-demo .cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background-color: var(--bs-primary);
  margin-left: 1px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@media (max-width: 767.98px) {
  #hero {
    min-height: auto;
    padding-top: 4rem;
    padding-bottom: 3rem;
  }

  .btn-group {
    flex-wrap: wrap;
  }

  .btn-group .btn {
    min-height: 44px;
  }
}

@media (max-width: 575.98px) {
  .display-4 {
    font-size: 2rem;
  }
}