/* Global */
:root {
  --dark-bg: #121212;
  --dark-card: #1E1E1E;
  --dark-text: #E0E0E0;
  --dark-heading: #FFFFFF;
  --dark-primary: #3B82F6;
  --dark-border: #333333;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px; /* for sticky header */
}

body {
  font-family: "Inter", sans-serif;
  background-color: var(--dark-bg);
  color: var(--dark-text);
}

/* Animated gradient header */
.animated-header {
  background: linear-gradient(-45deg, #121212, #1e1e1e, #121212, #333333);
  background-size: 400% 400%;
  animation: gradientPan 15s ease infinite;
}

/* Reveal-on-scroll system */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  will-change: opacity, transform;
  transition: opacity .6s ease-out, transform .8s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Project card hover */
.project-card:hover {
  border-color: var(--dark-primary);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

/* Social icon hover */
.social-icon-hover {
  transition: transform .2s ease-out, color .2s ease-out;
}
.social-icon-hover:hover {
  transform: translateY(-3px) scale(1.1);
  color: var(--dark-primary);
}

/* Publication link */
.publication-link {
  transition: transform .2s ease-out, box-shadow .2s ease-out, scale .2s ease-out;
}
.publication-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.4);
  scale: 1.03;
}

/* Typing effect (fixed: auto-remove the blue caret after typing) */
.typing-text {
  overflow: hidden;
  white-space: nowrap;
}
.typing-text.typing::after {
  content: "";
  display: inline-block;
  border-right: .15em solid var(--dark-primary);
  margin-left: 4px;
  height: 1em;
  vertical-align: -0.1em;
  animation: caretBlink 750ms step-end infinite;
}

/* Keyframes */
@keyframes gradientPan {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes caretBlink {
  from, to { border-color: transparent; }
  50% { border-color: var(--dark-primary); }
}
.typing-text.typing::after {
  animation: caretBlink 1s step-end infinite; /* was 750ms */
}

/* Back to top fade */
#back-to-top.show {
  display: block;
  animation: fadeUp .25s ease-out;
}
@keyframes fadeUp {
  0% { opacity: 0; transform: translateY(8px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* Respect user motion preferences */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .animated-header,
  #back-to-top.show {
    animation: none !important;
    transition: none !important;
  }
}


a[target="_blank"]:hover {
  text-decoration: underline;
  opacity: 0.9;
}