:root {
  --bg: #fafaf9;
  --bg-card: #ffffff;
  --text: #1c1917;
  --text-muted: #78716c;
  --border: #e7e5e4;
  --accent: #0f766e;
  --accent-light: #14b8a6;
  --accent-lighter: #5eead4;
}

.dark {
  --bg: #1c1917;
  --bg-card: #292524;
  --text: #fafaf9;
  --text-muted: #a8a29e;
  --border: #44403c;
  --accent: #14b8a6;
  --accent-light: #5eead4;
  --accent-lighter: #5eead4;
}

body {
  background-color: var(--bg);
  color: var(--text);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease, background-color 0.3s ease;
}

.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent); }
.text-accent-light { color: var(--accent-light); }

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-in {
  animation: fadeIn 0.4s ease both;
}

/* --- Tool header bar --- */
.tools-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  background: transparent;
  pointer-events: none;
}

.tools-header > * {
  pointer-events: auto;
}

.tools-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.15s ease;
}

.tools-back-link:hover {
  color: var(--accent);
}

/* --- Theme toggle button --- */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.15s ease;
}

.theme-toggle-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* --- Footer --- */
.tools-footer {
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.tools-footer a {
  color: var(--text-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* --- Card hover lift --- */
.card-lift:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}
.dark .card-lift:hover {
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}

/* --- Icon wrap --- */
.icon-wrap {
  background-color: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
}
.dark .icon-wrap {
  background-color: color-mix(in srgb, var(--accent) 20%, transparent);
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}