/* animations.css — entrance animations, transitions, theme toggle */

/* ── Page fade-in ── */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-up {
  animation: fadeUp 0.4s ease both;
}

.animate-fade-up:nth-child(1) { animation-delay: 0ms; }
.animate-fade-up:nth-child(2) { animation-delay: 60ms; }
.animate-fade-up:nth-child(3) { animation-delay: 120ms; }
.animate-fade-up:nth-child(4) { animation-delay: 180ms; }
.animate-fade-up:nth-child(5) { animation-delay: 240ms; }
.animate-fade-up:nth-child(6) { animation-delay: 300ms; }

/* ── Scroll reveal (JS-driven) ── */

.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── Theme toggle button ── */

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 6px 8px;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--text-dim);
  background: var(--bg-surface);
}

.theme-toggle svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform var(--transition-slow);
}

/* sun icon hidden in dark mode, shown in light */
.icon-sun  { display: none; }
.icon-moon { display: block; }

[data-theme="light"] .icon-sun  { display: block; }
[data-theme="light"] .icon-moon { display: none; }

/* ── Active nav indicator ── */

.sidebar-nav a {
  position: relative;
}

.sidebar-nav a.active::before {
  content: '';
  position: absolute;
  left: -1.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--accent);
  border-radius: 0 2px 2px 0;
}