/* Scroll Progress Bar */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, #1468ad, #9dc7ed);
  z-index: 9999;
  transition: width 0.1s linear;
}

/* Reduced motion: disable all scroll animations */
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-left, .reveal-right, .stagger-item {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* Reveal base states — hidden before scroll */
.reveal,
.reveal-left,
.reveal-right,
.stagger-item {
  opacity: 0;
  will-change: transform, opacity;
}

.reveal {
  transform: translateY(40px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal-left {
  transform: translateX(-40px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.reveal-right {
  transform: translateX(40px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

.stagger-item {
  transform: translateY(30px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

/* Visible state */
.reveal.in-view,
.reveal-left.in-view,
.reveal-right.in-view,
.stagger-item.in-view {
  opacity: 1;
  transform: none;
}

/* Stagger delays for timeline / list items */
.stagger-item:nth-child(1) { transition-delay: 0s; }
.stagger-item:nth-child(2) { transition-delay: 0.1s; }
.stagger-item:nth-child(3) { transition-delay: 0.2s; }
.stagger-item:nth-child(4) { transition-delay: 0.3s; }
.stagger-item:nth-child(5) { transition-delay: 0.4s; }
.stagger-item:nth-child(6) { transition-delay: 0.5s; }

/* Header shrink on scroll */
.header {
  transition: padding 0.3s ease, box-shadow 0.3s ease;
}

.header.scrolled {
  box-shadow: 0 2px 12px rgba(0,0,0,0.12);
  padding-top: 4px !important;
  padding-bottom: 4px !important;
}

/* Section title reveal with underline sweep */
.section-title {
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  width: 0;
  height: 2px;
  background: #1468ad;
  transition: width 0.6s ease 0.4s, left 0.6s ease 0.4s;
}

.section-title.in-view::after {
  width: 100%;
  left: 0;
}

/* Timeline dot pulse on reveal */
.timeline-dot {
  transition: transform 0.3s ease, background-color 0.3s ease;
}

.stagger-item.in-view .timeline-dot {
  transform: scale(1.2);
}

/* Professor feature image subtle zoom on hover */
.professor-photo img {
  transition: transform 0.4s ease;
}

.professor-photo:hover img {
  transform: scale(1.03);
}

/* Page loading and navigation transition */
.page-loader { position: fixed; inset: 0; z-index: 10000; display: grid; place-items: center; gap: 14px; align-content: center; background: #0b2448; color: #ffffff; opacity: 0; pointer-events: none; transition: opacity 0.24s ease; }
.page-loader__mark { width: 48px; height: 48px; border: 4px solid rgba(255, 255, 255, 0.25); border-top-color: #1468ad; border-radius: 50%; animation: page-loader-spin 0.75s linear infinite; }
.page-loader__text { margin: 0; font-size: 12px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; }
html.page-loading .page-loader, html.page-leaving .page-loader { opacity: 1; pointer-events: auto; }
html.page-loading body, html.page-leaving body { overflow: hidden; }
html.page-loading .wrapper, html.page-loading .local-wrapper, html.page-leaving .wrapper, html.page-leaving .local-wrapper { opacity: 0; transform: translateY(10px); }
.wrapper, .local-wrapper { transition: opacity 0.24s ease, transform 0.24s ease; }
@keyframes page-loader-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .page-loader, .wrapper, .local-wrapper { transition: none !important; } .page-loader__mark { animation: none; } }
.page-loader__scene { position: relative; width: min(620px, 86vw); height: 100px; overflow: hidden; }
.page-loader__track { position: absolute; right: 0; bottom: 16px; left: 0; height: 8px; border-top: 3px solid rgba(221, 189, 139, 0.9); border-bottom: 3px solid rgba(221, 189, 139, 0.45); }
.page-loader__train { position: absolute; bottom: 28px; left: 0; display: flex; gap: 7px; align-items: end; width: max-content; animation: page-loader-train 1.9s linear infinite; }
.page-loader__engine, .page-loader__car { position: relative; display: block; height: 34px; border-radius: 5px 5px 3px 3px; background: #1468ad; box-shadow: inset 0 -7px 0 rgba(11, 36, 72, 0.2); }
.page-loader__engine { width: 72px; border-radius: 20px 5px 3px 3px; }
.page-loader__engine::before { content: ''; position: absolute; top: -14px; right: 10px; width: 16px; height: 18px; border-radius: 3px 3px 0 0; background: #1468ad; }
.page-loader__car { width: 82px; }
.page-loader__engine::after, .page-loader__car::after { content: ''; position: absolute; right: 12px; bottom: -9px; left: 12px; height: 10px; background: radial-gradient(circle at 8px 5px, #ffffff 0 4px, #0b2448 4.5px 7px, transparent 7.5px), radial-gradient(circle at calc(100% - 8px) 5px, #ffffff 0 4px, #0b2448 4.5px 7px, transparent 7.5px); }
.page-loader__window { position: absolute; top: 7px; left: 12px; width: 18px; height: 11px; border-radius: 2px; background: #0b2448; box-shadow: 25px 0 #0b2448, 50px 0 #0b2448; }
.page-loader__engine .page-loader__window { left: 32px; box-shadow: 22px 0 #0b2448; }
@keyframes page-loader-train { from { transform: translateX(-180px); } to { transform: translateX(calc(100vw + 180px)); } }
@media (prefers-reduced-motion: reduce) { .page-loader__train { animation: none; left: 50%; transform: translateX(-50%); } }

.page-loader { background: radial-gradient(circle at 50% 80%, #123b70 0, #0b2448 56%, #071a36 100%); }
.page-loader__track { border-color: rgba(157, 199, 237, 0.9); box-shadow: 0 8px 18px rgba(59, 141, 218, 0.32); }
.page-loader__engine, .page-loader__car { background: linear-gradient(135deg, #9dc7ed 0%, #1468ad 48%, #0f4d8a 100%); box-shadow: inset 0 -7px 0 rgba(7, 26, 54, 0.36), 0 0 18px rgba(123, 195, 242, 0.28); }
.page-loader__engine::before { background: #b3d6f4; box-shadow: 0 0 12px rgba(179, 214, 244, 0.68); }
.page-loader__window, .page-loader__engine .page-loader__window { background: #082d5c; box-shadow: 25px 0 #082d5c, 50px 0 #082d5c; }
.page-loader__engine .page-loader__window { box-shadow: 22px 0 #082d5c; }
.page-loader__landscape { position: absolute; right: 10px; bottom: 24px; left: 10px; display: flex; align-items: end; justify-content: space-around; height: 62px; pointer-events: none; }
.page-loader__sprout { position: relative; display: block; width: 4px; height: 35px; border-radius: 999px; background: linear-gradient(#7bc3f2, #1468ad); transform: scaleY(0); transform-origin: bottom; animation: page-loader-grow 1.9s ease-in-out infinite; }
.page-loader__sprout::before, .page-loader__sprout::after { content: ''; position: absolute; width: 16px; height: 9px; border-radius: 100% 0 100% 0; background: linear-gradient(135deg, #d3e9fb, #3395dd); box-shadow: 0 0 10px rgba(123, 195, 242, 0.42); }
.page-loader__sprout::before { top: 8px; right: 1px; transform: rotate(-28deg); }
.page-loader__sprout::after { top: 17px; left: 1px; transform: scaleX(-1) rotate(-28deg); }
.page-loader__sprout:nth-child(1) { animation-delay: 0.18s; height: 24px; }
.page-loader__sprout:nth-child(2) { animation-delay: 0.38s; height: 39px; }
.page-loader__sprout:nth-child(3) { animation-delay: 0.58s; height: 28px; }
.page-loader__sprout:nth-child(4) { animation-delay: 0.78s; height: 46px; }
.page-loader__sprout:nth-child(5) { animation-delay: 0.98s; height: 31px; }
.page-loader__sprout:nth-child(6) { animation-delay: 1.18s; height: 42px; }
@keyframes page-loader-grow { 0%, 15% { opacity: 0; transform: scaleY(0); } 35%, 72% { opacity: 1; transform: scaleY(1); } 100% { opacity: 0; transform: scaleY(0.45); } }
@media (prefers-reduced-motion: reduce) { .page-loader__sprout { animation: none; opacity: 1; transform: scaleY(1); } }

.page-loader__train { animation-duration: 1.6s; }
@keyframes page-loader-train { from { transform: translateX(-110px); } to { transform: translateX(760px); } }