/* ========================================
   Navigation Component - 4-View Ecosystem
   ======================================== */

/* === Main Navigation Container === */

.view-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1);
  background: var(--bg-elevated);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-subtle);

  /* Center in header */
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

/* === Navigation Button === */

.view-nav__btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: none;
  border-radius: var(--border-radius);
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.view-nav__btn:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.view-nav__btn:active {
  transform: scale(0.98);
}

/* Active State */
.view-nav__btn--active {
  color: var(--text-primary);
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

.view-nav__btn--active:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

.view-nav__btn--active .view-nav__icon {
  opacity: 1;
  color: var(--primary);
}

/* === Icon === */

.view-nav__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.6;
  transition: all var(--transition-fast);
}

.view-nav__btn:hover .view-nav__icon {
  opacity: 1;
}

/* === Text Label === */

.view-nav__text {
  font-weight: var(--font-semibold);
  letter-spacing: -0.01em;
}

/* === Keyboard Shortcut Indicator === */

.view-nav__shortcut {
  display: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  opacity: 0.6;
  margin-left: var(--space-1);
}

/* Show shortcuts on hover (desktop only) */
@media (hover: hover) and (min-width: 900px) {
  .view-nav__btn:hover .view-nav__shortcut {
    display: inline;
  }
}

/* === Responsive Behavior === */

/* Medium screens - stay centered but compact */
@media (max-width: 1100px) {
  .view-nav__btn {
    padding: var(--space-2) var(--space-3);
  }
}

/* === Mobile Nav Trigger (header button) === */
.mobile-nav-trigger {
  display: none; /* Hidden on desktop */
}

@media (max-width: 800px) {
  /* Hide desktop nav */
  .view-nav {
    display: none;
  }

  /* Show mobile trigger - matches desktop nav pill style */
  .mobile-nav-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1);
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: var(--border-radius-lg);
    cursor: pointer;

    /* Center in header */
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: calc(var(--z-sticky) + 1);

    /* Prevent double-tap zoom */
    touch-action: manipulation;
  }

  /* Inner icon box - matches active nav button style */
  .mobile-nav-trigger__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    color: var(--primary);
  }

  .mobile-nav-trigger__icon svg {
    width: 18px;
    height: 18px;
  }

  .mobile-nav-trigger__chevron {
    width: 6px;
    height: 6px;
    border-right: 2px solid var(--text-muted);
    border-bottom: 2px solid var(--text-muted);
    transform: rotate(45deg);
    transition: transform 0.2s ease;
    margin: 0 var(--space-2);
  }

  /* Chevron flips when nav is expanded */
  .mobile-nav-trigger--active .mobile-nav-trigger__chevron {
    transform: rotate(-135deg);
  }

  /* === Nav: Hidden on mobile until expanded === */
  .view-nav {
    display: none;
  }

  .view-nav--expanded {
    display: flex;
    position: fixed;
    top: calc(var(--header-height) + var(--space-2));
    left: 50%;
    z-index: calc(var(--z-modal) + 1);

    /* Horizontal layout */
    flex-direction: row;
    align-items: stretch;
    gap: var(--space-1);
    padding: var(--space-2);
    margin: 0;

    /* Prevent overflow */
    max-width: calc(100vw - var(--space-6));

    /* Contained pill style - matches desktop */
    background: var(--bg-elevated);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--border-default);
    box-shadow:
      0 4px 24px rgba(0, 0, 0, 0.5),
      0 0 0 1px rgba(255, 255, 255, 0.05) inset;

    /* Dynamic Island style morph animation */
    animation: navExpand 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    transform-origin: center top;
  }

  @keyframes navExpand {
    0% {
      opacity: 0;
      transform: translateX(-50%) scaleX(0.3) scaleY(0.5);
    }
    50% {
      opacity: 1;
      transform: translateX(-50%) scaleX(1.02) scaleY(1.02);
    }
    100% {
      opacity: 1;
      transform: translateX(-50%) scaleX(1) scaleY(1);
    }
  }

  /* Mobile nav backdrop */
  .mobile-nav-backdrop {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: #1A2230;
    backdrop-filter: blur(2px);
    z-index: var(--z-modal);
    opacity: 0;
    transition: opacity 0.2s ease-out;
  }

  .mobile-nav-backdrop--active {
    display: block;
    opacity: 1;
  }

  .view-nav--expanded .view-nav__btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-2);
    border-radius: var(--border-radius);
    background: transparent;
    min-width: 52px;
    touch-action: manipulation;
  }

  .view-nav--expanded .view-nav__btn:hover {
    background: var(--bg-hover);
  }

  /* Active state - matches desktop pill highlight */
  .view-nav--expanded .view-nav__btn--active {
    color: var(--text-primary);
    background: var(--bg-surface);
    box-shadow: var(--shadow-sm);
  }

  .view-nav--expanded .view-nav__btn--active:hover {
    background: var(--bg-surface);
  }

  .view-nav--expanded .view-nav__btn--active .view-nav__icon {
    color: var(--primary);
    opacity: 1;
  }

  .view-nav--expanded .view-nav__text {
    display: block;
    font-size: var(--text-xs);
    white-space: nowrap;
  }

  .view-nav--expanded .view-nav__icon {
    width: 20px;
    height: 20px;
    opacity: 0.7;
  }

  .view-nav--expanded .view-nav__btn:hover .view-nav__icon,
  .view-nav--expanded .view-nav__btn--active .view-nav__icon {
    opacity: 1;
  }
}