/* ============================================================
   Smooth Transitions & Page Animations
   ============================================================ */

/* Page entrance fade */
body {
  animation: pageEnter 0.6s cubic-bezier(0.4, 0.0, 0.2, 1);
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Link hover glow effect */
a {
  position: relative;
}

a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--signal), transparent);
  transition: width 0.4s cubic-bezier(0.4, 0.0, 0.2, 1);
}

a:hover::after {
  width: 100%;
}

/* Card entrance animation */
.glass {
  animation: cardSlideIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  transform-origin: center top;
}

@keyframes cardSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Button scale on hover */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, rgba(255,255,255,0.3) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.4s cubic-bezier(0.4, 0.0, 0.2, 1);
  pointer-events: none;
}

.btn:hover::before {
  opacity: 1;
}

/* Form input focus animation */
input:focus,
select:focus,
textarea:focus {
  animation: inputPulse 0.4s cubic-bezier(0.4, 0.0, 0.2, 1);
}

@keyframes inputPulse {
  0% {
    box-shadow: 0 0 0 0 var(--signal);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(35, 51, 231, 0.1);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(35, 51, 231, 0);
  }
}

/* Smooth tab/section transitions */
[data-tab-content] {
  animation: tabSlideIn 0.5s cubic-bezier(0.4, 0.0, 0.2, 1);
}

@keyframes tabSlideIn {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* List item stagger animation */
.list-item,
.stat-card,
.tilt-card {
  animation: listItemEnter 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.list-item:nth-child(1) { animation-delay: 0.05s; }
.list-item:nth-child(2) { animation-delay: 0.1s; }
.list-item:nth-child(3) { animation-delay: 0.15s; }
.list-item:nth-child(4) { animation-delay: 0.2s; }
.list-item:nth-child(5) { animation-delay: 0.25s; }
.list-item:nth-child(6) { animation-delay: 0.3s; }

.stat-card:nth-child(1) { animation-delay: 0.1s; }
.stat-card:nth-child(2) { animation-delay: 0.2s; }
.stat-card:nth-child(3) { animation-delay: 0.3s; }
.stat-card:nth-child(4) { animation-delay: 0.4s; }

.tilt-card:nth-child(1) { animation-delay: 0.05s; }
.tilt-card:nth-child(2) { animation-delay: 0.1s; }
.tilt-card:nth-child(3) { animation-delay: 0.15s; }
.tilt-card:nth-child(4) { animation-delay: 0.2s; }
.tilt-card:nth-child(5) { animation-delay: 0.25s; }
.tilt-card:nth-child(6) { animation-delay: 0.3s; }

@keyframes listItemEnter {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Button press effect */
.btn:active {
  animation: buttonPress 0.2s cubic-bezier(0.6, 0, 0.4, 1);
}

@keyframes buttonPress {
  50% {
    transform: scale(0.96);
  }
}

/* Heading entrance */
h1, h2, h3, h4 {
  animation: headingEnter 0.7s cubic-bezier(0.34, 1.56, 0.64, 1) backwards;
}

h1 { animation-delay: 0.1s; }
h2 { animation-delay: 0.15s; }
h3 { animation-delay: 0.2s; }
h4 { animation-delay: 0.05s; }

@keyframes headingEnter {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Paragraph fade in */
p {
  animation: paragraphEnter 0.6s cubic-bezier(0.4, 0.0, 0.2, 1) backwards;
}

p { animation-delay: 0.2s; }

@keyframes paragraphEnter {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Smooth scrollbar behavior */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--signal);
  border-radius: 5px;
  transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--c1);
}

/* Modal/Dialog entrance */
.modal,
[role="dialog"] {
  animation: modalSlideIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.92) translateY(20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Toast notification slide */
.toast {
  animation: toastSlide 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes toastSlide {
  from {
    opacity: 0;
    transform: translateX(100px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Smooth background transitions */
body {
  transition: background 0.8s cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* Navigation smooth slide */
.nav-links.open {
  animation: navSlideDown 0.4s cubic-bezier(0.4, 0.0, 0.2, 1);
}

@keyframes navSlideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Icon rotation on hover */
.icon-rotate:hover {
  transform: rotate(12deg) scale(1.05);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Gradient animation */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.gradient-animate {
  background-size: 200% 200%;
  animation: gradientShift 6s ease infinite;
}

/* Respects prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}