/* ==========================================================================
   US Verticals — Glass Rail In-Page Navigation
   Version: 1.0.0
   Description: Floating glassmorphism navigation pill + panel
   Usage: Auto-generates from data-nav-label and data-nav-link attributes
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  --usv-crimson: #902E2E;
  --usv-crimson-tint: rgba(144, 46, 46, 0.06);
  --usv-charcoal: #2C2C2A;
  --usv-text: #5F5E5A;
  --usv-text-light: #888780;
  --usv-glass-bg: rgba(255, 255, 255, 0.25);
  --usv-glass-bg-hover: rgba(255, 255, 255, 0.5);
  --usv-glass-panel: rgba(255, 255, 255, 0.82);
  --usv-glass-border: rgba(255, 255, 255, 0.55);
  --usv-glass-blur: 18px;
  --usv-glass-blur-panel: 22px;
  --usv-shadow: -4px 4px 20px rgba(0, 0, 0, 0.06), 0 0 0 1px rgba(0, 0, 0, 0.02);
  --usv-shadow-hover: -4px 6px 28px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.03);
  --usv-shadow-panel: -6px 8px 32px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(0, 0, 0, 0.02);
  --usv-radius-pill: 22px;
  --usv-radius-panel: 20px;
  --usv-radius-item: 12px;
  --usv-transition-fast: 180ms ease;
  --usv-transition-panel: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --usv-pill-width: 38px;
  --usv-pill-width-hover: 42px;
  --usv-panel-width: 230px;
  --usv-nav-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
}

/* --------------------------------------------------------------------------
   Collapsed Pill — Right Edge
   -------------------------------------------------------------------------- */
.usv-rail-pill {
  position: fixed;
  right: 0;
  top: 75%;
  transform: translateY(-50%);
  width: var(--usv-pill-width);
  padding: 14px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  background: var(--usv-glass-bg);
  backdrop-filter: blur(var(--usv-glass-blur));
  -webkit-backdrop-filter: blur(var(--usv-glass-blur));
  border: 1px solid var(--usv-glass-border);
  border-right: none;
  border-radius: var(--usv-radius-pill) 0 0 var(--usv-radius-pill);
  cursor: pointer;
  z-index: 9998;
  transition: all var(--usv-transition-fast);
  box-shadow: var(--usv-shadow);
  font-family: var(--usv-nav-font);
}

.usv-rail-pill:hover {
  width: var(--usv-pill-width-hover);
  background: var(--usv-glass-bg-hover);
  box-shadow: var(--usv-shadow-hover);
}

.usv-rail-pill .usv-pill-icon {
  transition: transform var(--usv-transition-fast);
}

.usv-rail-pill:hover .usv-pill-icon {
  transform: scale(1.12);
}

.usv-rail-pill .usv-pill-label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 10.5px;
  color: var(--usv-text);
  letter-spacing: 1.8px;
  font-weight: 500;
  transition: color var(--usv-transition-fast);
  user-select: none;
}

.usv-rail-pill:hover .usv-pill-label {
  color: var(--usv-charcoal);
}

/* Pill hidden state (when panel is open) */
.usv-rail-pill.usv-hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(-50%) scale(0.92);
}

/* --------------------------------------------------------------------------
   Expanded Panel — Glass Overlay
   -------------------------------------------------------------------------- */
.usv-rail-panel {
  position: fixed;
  right: 0;
  top: 75%;
  transform: translateY(-50%) scale(0.96);
  width: var(--usv-panel-width);
  background: var(--usv-glass-panel);
  backdrop-filter: blur(var(--usv-glass-blur-panel));
  -webkit-backdrop-filter: blur(var(--usv-glass-blur-panel));
  border: 1px solid var(--usv-glass-border);
  border-right: none;
  border-radius: var(--usv-radius-panel) 0 0 var(--usv-radius-panel);
  padding: 0;
  opacity: 0;
  pointer-events: none;
  z-index: 9999;
  transition: all var(--usv-transition-panel);
  box-shadow: var(--usv-shadow-panel);
  font-family: var(--usv-nav-font);
  overflow: hidden;
}

.usv-rail-panel.usv-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(-50%) scale(1);
}

/* --------------------------------------------------------------------------
   Panel Header
   -------------------------------------------------------------------------- */
.usv-panel-header {
  padding: 16px 18px 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.usv-panel-title {
  font-size: 10.5px;
  color: var(--usv-text-light);
  letter-spacing: 1.3px;
  font-weight: 500;
  text-transform: uppercase;
  user-select: none;
}

.usv-panel-close {
  cursor: pointer;
  padding: 3px;
  opacity: 0.35;
  transition: opacity 150ms ease, background 150ms ease;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: none;
  background: transparent;
  line-height: 0;
}

.usv-panel-close:hover {
  opacity: 0.7;
  background: rgba(0, 0, 0, 0.04);
}

/* --------------------------------------------------------------------------
   Navigation List
   -------------------------------------------------------------------------- */
.usv-nav-list {
  padding: 2px 8px 16px;
  list-style: none;
  margin: 0;
}

.usv-nav-item {
  display: flex;
  align-items: center;
  padding: 9px 12px;
  border-radius: var(--usv-radius-item);
  cursor: pointer;
  transition: all 150ms ease;
  position: relative;
  margin-bottom: 1px;
  text-decoration: none;
  color: inherit;
}

.usv-nav-item:hover {
  background: rgba(0, 0, 0, 0.03);
}

.usv-nav-item.usv-active {
  background: var(--usv-crimson-tint);
}

/* Left accent bar */
.usv-nav-item::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 9px;
  bottom: 9px;
  width: 3px;
  border-radius: 2px;
  background: transparent;
  transition: background var(--usv-transition-fast);
}

.usv-nav-item.usv-active::before {
  background: var(--usv-crimson);
}

/* Nav item text */
.usv-nav-item .usv-nav-text {
  margin-left: 10px;
  font-size: 13px;
  color: var(--usv-text);
  transition: all 150ms ease;
  font-weight: 400;
}

.usv-nav-item.usv-active .usv-nav-text {
  color: var(--usv-crimson);
  font-weight: 500;
}

.usv-nav-item:hover .usv-nav-text {
  color: var(--usv-charcoal);
}

/* --------------------------------------------------------------------------
   Mobile Styles — Floating Button + Slide-Up Panel
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .usv-rail-pill {
    top: auto;
    bottom: 20px;
    right: 16px;
    transform: none;
    width: 44px;
    height: 44px;
    padding: 0;
    border-radius: 50%;
    border: 1px solid var(--usv-glass-border);
    justify-content: center;
    gap: 0;
  }

  .usv-rail-pill:hover {
    width: 44px;
  }

  .usv-rail-pill .usv-pill-label {
    display: none;
  }

  .usv-rail-pill.usv-hidden {
    transform: scale(0.92);
  }

  .usv-rail-panel {
    top: auto;
    bottom: 0;
    right: 0;
    left: 0;
    width: 100%;
    max-height: 70vh;
    transform: translateY(100%);
    border-radius: var(--usv-radius-panel) var(--usv-radius-panel) 0 0;
    border: 1px solid var(--usv-glass-border);
    border-bottom: none;
    opacity: 1;
  }

  .usv-rail-panel.usv-open {
    transform: translateY(0);
    pointer-events: auto;
  }

  /* Backdrop overlay on mobile */
  .usv-rail-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.25);
    z-index: 9998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 200ms ease;
  }

  .usv-rail-backdrop.usv-visible {
    opacity: 1;
    pointer-events: auto;
  }
}

/* --------------------------------------------------------------------------
   Scroll Padding — Offset for Sticky Header
   Adjust the 80px value to match your actual header height.
   -------------------------------------------------------------------------- */
html {
  scroll-padding-top: 80px;
}

/* --------------------------------------------------------------------------
   Accessibility — Reduced Motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .usv-rail-pill,
  .usv-rail-panel,
  .usv-nav-item,
  .usv-nav-item::before,
  .usv-panel-close,
  .usv-rail-backdrop {
    transition: none;
  }
}

/* --------------------------------------------------------------------------
   Print — Hide Navigation
   -------------------------------------------------------------------------- */
@media print {
  .usv-rail-pill,
  .usv-rail-panel,
  .usv-rail-backdrop {
    display: none !important;
  }
}