/* ==========================================================================
   SCROLL EFFECTS & KINETIC ANIMATIONS
   Startup 360D Stacking Cards + Kinetic Parallax Physics
   ========================================================================== */

/* 3D Stacking Cards Section */
.stack-section {
  position: relative;
  background-color: var(--bg-paper);
}

.stack-card {
  position: sticky;
  top: 140px;
  min-height: 480px;
  border-radius: 36px;
  overflow: hidden;
  box-shadow: 0 25px 60px -20px rgba(11, 31, 46, 0.2);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease, filter 0.4s ease;
  transform-origin: top center;
  will-change: transform, opacity, filter;
  margin-bottom: 2.5rem;
}

/* Three distinct luxury cards */
.stack-card-1 {
  background: #174D38;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.stack-card-2 {
  background: linear-gradient(145deg, #4D1717 0%, #3D1212 50%, #2E0D0D 100%);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.stack-card-3 {
  background: #0C241B;
  color: #ffffff;
  border: 1px solid rgba(23, 77, 56, 0.4);
}

/* Kinetic Horizontal Parallax Ribbons */
.kinetic-section {
  position: relative;
  overflow: hidden;
  padding: 6rem 0;
  background: #ffffff;
  user-select: none;
}

.kinetic-track {
  display: flex;
  white-space: nowrap;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 0.9;
  font-size: clamp(2.5rem, 7vw, 7.5rem);
  will-change: transform;
  transition: transform 0.1s linear;
}

.kinetic-track-1 {
  color: var(--brand-navy);
}

.kinetic-track-2 {
  color: #174D38;
}

.kinetic-track-3 {
  color: var(--brand-navy);
}

.kinetic-track-4 {
  color: #4D1717;
}

.kinetic-track-5 {
  color: var(--brand-slate);
}

/* Glassmorphism Sticky Header Transitions */
.site-header {
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.site-header.scrolled {
  top: 1rem;
  padding: 0.5rem 1rem;
}

/* Reveal-on-scroll elements */
.reveal-init {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-init.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delay classes */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* Modal & Drawer Transitions */
.modal-overlay {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  transform: scale(0.95) translateY(20px);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-content {
  transform: scale(1) translateY(0);
}

/* Floating Drawer */
.drawer-bottom {
  transform: translateY(100%);
  transition: transform 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

.drawer-bottom.active {
  transform: translateY(0);
}