/* Reset, typography, animations */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
  font-size: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

body.lang-zh {
  font-family: var(--font-cn);
}

body.lang-zh .btn {
  font-family: var(--font-cn);
}

/* Keyframe animations */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes slideRight {
  from { opacity: 0; transform: translateX(-40px); }
  to   { opacity: 1; transform: translateX(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes waveFloat {
  0%, 100% { transform: translateX(0) translateY(0); }
  25%      { transform: translateX(10px) translateY(-5px); }
  50%      { transform: translateX(0) translateY(-8px); }
  75%      { transform: translateX(-10px) translateY(-3px); }
}

@keyframes pulseGlow {
  0%, 100% { opacity: .4; }
  50%      { opacity: .8; }
}

@keyframes beamPulse {
  0%   { opacity: .6; height: 0; }
  50%  { opacity: .3; }
  100% { opacity: 0; height: 120px; }
}

@keyframes ripple {
  0%   { transform: scale(.8); opacity: .6; }
  100% { transform: scale(2.5); opacity: 0; }
}

@keyframes dataStream {
  0%   { transform: translateY(0); opacity: 0; }
  20%  { opacity: 1; }
  80%  { opacity: 1; }
  100% { transform: translateY(-60px); opacity: 0; }
}

/* Scroll-triggered animation utility */

.anim {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}

.anim.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .anim {
    opacity: 1;
    transform: none;
  }
}