/* ==========================================================================
   KHEE KHEE - ANIMATED & INTERACTIVE SCROLL SPY (DARK THEME)
   ========================================================================== */

/* 1. Top Reading Progress Bar */
.scroll-progress-bar {
  position: fixed;
  top: var(--navbar-height, 64px);
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, #1A2FA0 0%, #2563EB 35%, #38BDF8 70%, #10B981 100%);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.65);
  z-index: 899;
  pointer-events: none;
  transition: width 0.1s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. Floating Interactive Scroll Spy Dock */
.scrollspy-dock {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 850;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 6px;
  background: rgba(9, 13, 24, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 999px;
  box-shadow: 0 16px 40px -8px rgba(0, 0, 0, 0.7),
              0 0 24px rgba(26, 47, 160, 0.2);
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.3s ease;
  user-select: none;
}

.scrollspy-dock:hover {
  background: rgba(13, 20, 36, 0.88);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 20px 48px -8px rgba(0, 0, 0, 0.8),
              0 0 28px rgba(56, 189, 248, 0.25);
}

.scrollspy-track {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.scrollspy-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  text-decoration: none;
  outline: none;
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.scrollspy-dot {
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.28);
  transition: all 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.scrollspy-item:hover .scrollspy-dot {
  transform: scale(1.4);
  background: #38BDF8;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.8);
}

/* Active State: Elongated Radiant Neon Capsule */
.scrollspy-item.active .scrollspy-dot {
  width: 6px;
  height: 18px;
  border-radius: 999px;
  background: linear-gradient(180deg, #38BDF8 0%, #2563EB 100%);
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.85),
              0 0 4px rgba(255, 255, 255, 0.5);
}

/* Interactive Floating Tooltip Label */
.scrollspy-label {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%) translateX(6px);
  padding: 5px 11px;
  background: rgba(14, 21, 38, 0.94);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--border-radius-sm, 6px);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  color: #F1F5F9;
  letter-spacing: 0.01em;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6),
              0 0 12px rgba(26, 47, 160, 0.3);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.2s cubic-bezier(0.16, 1, 0.3, 1),
              visibility 0.2s;
}

.scrollspy-label::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -5px;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid rgba(56, 189, 248, 0.35);
}

.scrollspy-item:hover .scrollspy-label,
.scrollspy-item:focus-visible .scrollspy-label {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
}

/* Keyboard Focus States (Accessibility) */
.scrollspy-item:focus-visible {
  outline: 2px solid #38BDF8;
  outline-offset: 2px;
}

/* Hide Dock on Mobile/Tablet to Prevent Obscuring Content */
@media (max-width: 991px) {
  .scrollspy-dock {
    display: none !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-progress-bar,
  .scrollspy-dot,
  .scrollspy-label,
  .scrollspy-dock {
    transition: none !important;
  }
}