/* ============================================
   ANIMATIONS — Keyframes, Reveals, Transitions
   ============================================ */

/* ── Scroll Reveal System ── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-stagger.revealed > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.revealed > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.revealed > *:nth-child(3) { transition-delay: 0.15s; }
.reveal-stagger.revealed > *:nth-child(4) { transition-delay: 0.2s; }
.reveal-stagger.revealed > *:nth-child(5) { transition-delay: 0.25s; }
.reveal-stagger.revealed > *:nth-child(6) { transition-delay: 0.3s; }
.reveal-stagger.revealed > *:nth-child(7) { transition-delay: 0.35s; }
.reveal-stagger.revealed > *:nth-child(8) { transition-delay: 0.4s; }
.reveal-stagger.revealed > *:nth-child(9) { transition-delay: 0.45s; }
.reveal-stagger.revealed > *:nth-child(10) { transition-delay: 0.5s; }
.reveal-stagger.revealed > *:nth-child(11) { transition-delay: 0.55s; }
.reveal-stagger.revealed > *:nth-child(12) { transition-delay: 0.6s; }

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

/* ── Hero Text Stagger ── */
@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-animate {
  opacity: 0;
  animation: heroFadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero-animate:nth-child(1) { animation-delay: 0.2s; }
.hero-animate:nth-child(2) { animation-delay: 0.35s; }
.hero-animate:nth-child(3) { animation-delay: 0.5s; }
.hero-animate:nth-child(4) { animation-delay: 0.65s; }
.hero-animate:nth-child(5) { animation-delay: 0.8s; }

/* ── Gradient Mesh Background ── */
@keyframes meshMove1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25%      { transform: translate(80px, -60px) scale(1.1); }
  50%      { transform: translate(-40px, 80px) scale(0.95); }
  75%      { transform: translate(60px, 40px) scale(1.05); }
}

@keyframes meshMove2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25%      { transform: translate(-70px, 50px) scale(1.15); }
  50%      { transform: translate(60px, -80px) scale(0.9); }
  75%      { transform: translate(-50px, -30px) scale(1.1); }
}

@keyframes meshMove3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%      { transform: translate(50px, 70px) scale(1.08); }
  66%      { transform: translate(-80px, -40px) scale(0.92); }
}

/* ── Floating Particles ── */
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); opacity: 0.6; }
  50%      { transform: translateY(-20px) rotate(180deg); opacity: 1; }
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0px); }
  50%      { transform: translateY(-12px); }
}

/* ── Glow Pulse ── */
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(100, 255, 218, 0.15); }
  50%      { box-shadow: 0 0 30px rgba(100, 255, 218, 0.3); }
}

/* ── Subtle Pulse ── */
@keyframes subtlePulse {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 0.8; }
}

/* ── Nav Fade In ── */
@keyframes navSlideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Line Draw ── */
@keyframes lineGrow {
  from { width: 0; }
  to   { width: 100%; }
}

/* ── Tab underline slide ── */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ── Card Hover Transitions ── */
.hover-lift {
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: var(--glass-border-hover);
}

/* ── Image Tilt ── */
.hover-tilt {
  transition: transform var(--transition-base);
}

.hover-tilt:hover {
  transform: perspective(800px) rotateY(-5deg) rotateX(3deg) scale(1.02);
}

/* ── Link Underline Animation ── */
.link-underline {
  position: relative;
  display: inline-block;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-primary);
  transition: width var(--transition-base);
}

.link-underline:hover::after {
  width: 100%;
}

/* ── Spin (for loading or icons) ── */
@keyframes spin {
  to { transform: rotate(360deg); }
}