/* Scroll-triggered reveal.
   The hidden state is gated behind `html.js` so that if JavaScript is disabled
   or fails, all content shows by default (no permanently-blank sections). */
.reveal {
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

html.js .reveal {
  opacity: 0;
  transform: translateY(30px);
}

html.js .reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered children animation */
.reveal-stagger > * {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

html.js .reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
}

.reveal-stagger--visible > *:nth-child(1) { transition-delay: 0.1s; }
.reveal-stagger--visible > *:nth-child(2) { transition-delay: 0.2s; }
.reveal-stagger--visible > *:nth-child(3) { transition-delay: 0.3s; }
.reveal-stagger--visible > *:nth-child(4) { transition-delay: 0.4s; }
.reveal-stagger--visible > *:nth-child(5) { transition-delay: 0.5s; }
.reveal-stagger--visible > *:nth-child(6) { transition-delay: 0.6s; }

html.js .reveal-stagger--visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Hero entrance */
.hero__name {
  animation: heroEntrance 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  opacity: 0;
}

@keyframes heroEntrance {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

/* Hero subtitle fade in (delayed) */
.hero__subtitle {
  animation: fadeUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.3s forwards;
  opacity: 0;
}

.hero__affiliation {
  animation: fadeUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.5s forwards;
  opacity: 0;
}

.hero__socials {
  animation: fadeUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) 0.7s forwards;
  opacity: 0;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Pulse accent line */
.hero__accent {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--gradient-1), var(--gradient-2));
  border-radius: 2px;
  margin: var(--space-md) auto;
  animation: accentPulse 3s ease-in-out infinite alternate;
}

@keyframes accentPulse {
  from { opacity: 0.4; width: 60px; }
  to { opacity: 0.9; width: 80px; }
}

/* Social icon hover */
.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.social-icon:hover {
  color: var(--text-primary);
  transform: scale(1.15);
}

.social-icon svg {
  width: 22px;
  height: 22px;
}

/* ========== THEMATIC BACKGROUND ANIMATIONS ========== */

/* Floating math symbols — position-only drift, NO opacity change */
@keyframes symbolFloat {
  0%   { transform: translate(0, 0) rotate(0deg); }
  25%  { transform: translate(8px, -12px) rotate(2deg); }
  50%  { transform: translate(-5px, -6px) rotate(-1deg); }
  75%  { transform: translate(3px, -15px) rotate(1.5deg); }
  100% { transform: translate(-4px, -20px) rotate(-0.5deg); }
}

/* Formula drift — position-only, NO opacity change */
@keyframes formulaDrift {
  0%   { transform: translate(0, 0); }
  20%  { transform: translate(6px, -4px); }
  40%  { transform: translate(-3px, 3px); }
  60%  { transform: translate(4px, -6px); }
  80%  { transform: translate(-5px, 2px); }
  100% { transform: translate(2px, -3px); }
}

/* Stock number pulse — position-only, NO opacity change */
@keyframes numberPulse {
  0%   { transform: translateY(0); }
  25%  { transform: translateY(-2px); }
  50%  { transform: translateY(1px); }
  75%  { transform: translateY(-1px); }
  100% { transform: translateY(0); }
}

/* Ticker tape scroll — left to right continuous */
@keyframes tickerScroll {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* Ticker tape scroll — right to left (reverse) */
@keyframes tickerScrollReverse {
  0%   { transform: translateX(-50%); }
  100% { transform: translateX(0); }
}

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

  html.js .reveal {
    opacity: 1;
    transform: none;
  }

  html.js .reveal-stagger > * {
    opacity: 1;
    transform: none;
  }
}