:root {
  --intage-primary: #0f766e;      /* teal-700 */
  --intage-primary-dark: #115e59; /* teal-800 */
  --intage-secondary: #059669;    /* emerald-600 */
  --intage-accent: #fbbf24;       /* amber-400 */
  --intage-sky: #0284c7;          /* sky-600 */
  --intage-bg: #f8fafc;           /* slate-50 */
  --intage-surface: rgba(255, 255, 255, 0.78);
  --intage-border: rgba(13, 148, 136, 0.14);
  --intage-shadow: 0 8px 30px rgba(15, 118, 110, 0.10);
  --intage-shadow-soft: 0 4px 14px rgba(15, 23, 42, 0.08);
  --intage-text: #1e293b;         /* slate-800 */
  --intage-text-soft: #475569;    /* slate-600 */
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--intage-bg);
  color: var(--intage-text);
}

/* Timeline */
.timeline-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline-item.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Optional nicer timeline card look if used */
.timeline-item .timeline-card,
.timeline-item .card,
.timeline-item > div {
  border: 1px solid var(--intage-border);
  box-shadow: var(--intage-shadow-soft);
}

/* Sticky navbar */
.navbar-sticky {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.84);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--intage-border);
  box-shadow: 0 1px 0 rgba(255,255,255,0.6), var(--intage-shadow-soft);
}

/* Hidden scrollbar */
.scrollbar-hide::-webkit-scrollbar {
  display: none;
}

.scrollbar-hide {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* Carousel */
.carousel-container {
  perspective: 1000px;
  touch-action: pan-y pinch-zoom;
}

.carousel-track {
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(0.23, 1, 0.32, 1);
}

.carousel-item {
  backface-visibility: hidden;
  transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
  border-radius: 1.25rem;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(255,255,255,0.88));
  border: 1px solid rgba(14, 165, 233, 0.10);
  box-shadow: var(--intage-shadow);
}

.carousel-item.active {
  opacity: 1;
  transform: scale(1) translateZ(0);
  border-color: rgba(5, 150, 105, 0.20);
  box-shadow:
    0 14px 40px rgba(15, 118, 110, 0.16),
    0 0 0 1px rgba(16, 185, 129, 0.08);
}

@media (max-width: 640px) {
  .carousel-item.prev {
    opacity: 0;
    transform: scale(0.8) translateX(-50%) translateZ(-100px);
  }

  .carousel-item.next {
    opacity: 0;
    transform: scale(0.8) translateX(50%) translateZ(-100px);
  }
}

@media (min-width: 641px) {
  .carousel-item.prev {
    opacity: 0.72;
    transform: scale(0.9) translateX(-100%) translateZ(-100px);
    filter: saturate(0.9);
  }

  .carousel-item.next {
    opacity: 0.72;
    transform: scale(0.9) translateX(100%) translateZ(-100px);
    filter: saturate(0.9);
  }
}

.carousel-item.hidden {
  opacity: 0;
  transform: scale(0.8) translateZ(-200px);
}

/* Navigation buttons */
.nav-button {
  transition: all 0.3s ease;
  background: linear-gradient(
    135deg,
    rgba(15, 118, 110, 0.20),
    rgba(2, 132, 199, 0.16)
  );
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 8px 24px rgba(15, 118, 110, 0.14);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

@media (hover: hover) {
  .nav-button:hover {
    background: linear-gradient(
      135deg,
      rgba(15, 118, 110, 0.32),
      rgba(2, 132, 199, 0.24)
    );
    transform: scale(1.08);
    box-shadow: 0 10px 28px rgba(15, 118, 110, 0.20);
  }
}

.nav-button:active {
  transform: scale(0.95);
}

/* Progress bar */
.progress-bar {
  transition: width 0.5s cubic-bezier(0.23, 1, 0.32, 1);
  background: linear-gradient(
    90deg,
    var(--intage-primary),
    var(--intage-secondary),
    var(--intage-accent)
  );
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.18);
}

/* Optional helper classes for the new theme */
.intage-glass {
  background: var(--intage-surface);
  border: 1px solid var(--intage-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--intage-shadow-soft);
}

.intage-gradient-text {
  background: linear-gradient(90deg, var(--intage-primary), var(--intage-secondary), var(--intage-sky));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.intage-section-accent {
  position: relative;
}

.intage-section-accent::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 84px;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--intage-primary), var(--intage-accent));
}