@layer base {
  html,
  body {
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
  }
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f7f9ff;
}

::-webkit-scrollbar-thumb {
  background: #c8dbfe;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #146ef5;
}

/* ============================================================
   Scroll-reveal animation (progressive enhancement — classes
   are only ever added by js/animations.js, so content stays
   fully visible if JS fails to load)
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-item {
  opacity: 0;
  transform: translateY(16px) scale(0.98);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}
.reveal-item.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* ============================================================
   Header scroll state
   ============================================================ */
header {
  transition: box-shadow 0.35s ease, padding 0.35s ease;
}
header.is-scrolled {
  box-shadow: 0 4px 24px rgba(11, 31, 58, 0.1);
}
header.is-scrolled .header-inner {
  padding-top: 0.65rem;
  padding-bottom: 0.65rem;
}
.header-inner {
  transition: padding 0.35s ease;
}

/* ============================================================
   Mobile menu
   ============================================================ */
#mobile-menu {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1),
    opacity 0.3s ease;
}
#mobile-menu.is-open {
  max-height: 420px;
  opacity: 1;
}
#mobile-menu-toggle .icon-menu,
#mobile-menu-toggle .icon-close {
  transition: opacity 0.2s ease, transform 0.3s ease;
}
#mobile-menu-toggle .icon-close {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: rotate(-45deg);
}
#mobile-menu-toggle.is-open .icon-menu {
  opacity: 0;
  transform: rotate(45deg);
}
#mobile-menu-toggle.is-open .icon-close {
  opacity: 1;
  transform: rotate(0deg);
}

/* ============================================================
   Floating hero cards + ambient blobs
   ============================================================ */
@keyframes floatY {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-9px);
  }
}
.float-slow {
  animation: floatY 5.5s ease-in-out infinite;
}
.float-slow-delayed {
  animation: floatY 5.5s ease-in-out infinite;
  animation-delay: -2.75s;
}

@keyframes blobPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.9;
  }
  50% {
    transform: scale(1.12);
    opacity: 1;
  }
}
.blob-pulse {
  animation: blobPulse 9s ease-in-out infinite;
}
.blob-pulse-delayed {
  animation: blobPulse 9s ease-in-out infinite;
  animation-delay: -4.5s;
}

/* ============================================================
   Testimonial scroll-snap track
   ============================================================ */
#testimonial-track {
  scrollbar-width: none;
  -ms-overflow-style: none;
  scroll-behavior: smooth;
}
#testimonial-track::-webkit-scrollbar {
  display: none;
}
.testimonial-card {
  scroll-snap-align: start;
}
#testimonial-prev:disabled,
#testimonial-next:disabled {
  opacity: 0.35;
  cursor: default;
  pointer-events: none;
}

/* ============================================================
   Tech stack filter transitions
   ============================================================ */
.tech-item {
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.tech-item.tech-hidden {
  opacity: 0;
  transform: scale(0.85);
  pointer-events: none;
  position: absolute;
  visibility: hidden;
}
.filter-pill {
  transition: background-color 0.25s ease, color 0.25s ease,
    border-color 0.25s ease, transform 0.15s ease;
}

/* ============================================================
   Back-to-top button
   ============================================================ */
#back-to-top {
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px) scale(0.9);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
}
#back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

/* ============================================================
   General interactive touches
   ============================================================ */
a,
button {
  transition-property: color, background-color, border-color, transform,
    box-shadow, opacity;
}

/* ============================================================
   Respect reduced-motion preference
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal,
  .reveal-item {
    opacity: 1 !important;
    transform: none !important;
  }
}