/**
 * Header Mobile Adjustments
 * =========================
 * Mobile-first responsive header styling:
 *   - Hide tab bar on mobile (≤768px), navigation via drawer
 *   - Hamburger left, logo center, settings right
 *   - Keyboard handling for virtual keyboards
 *   - Sticky behavior with scroll shadow
 *   - Tablet: tabs visible with horizontal scroll
 *
 * Dependencies: responsive.css, hamburger.css
 */

/* ==========================================================================
   Mobile Header Layout (≤768px)
   ========================================================================== */

@media (max-width: 768px) {
  /* Hide tab navigation on mobile - drawer handles navigation */
  .header .tabs {
    display: none !important;
  }
  
  /* Header becomes a compact single row */
  .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    min-height: 56px; /* Touch-friendly height */
    gap: 0.5rem;
  }
  
  /* Left section: hamburger button */
  .hamburger-btn {
    flex-shrink: 0;
    order: 1;
  }
  
  /* Center section: app logo/title (if present) */
  .header-logo,
  .header-title {
    flex: 1;
    order: 2;
    text-align: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  
  /* Right section: quick-access icons */
  .header-right {
    flex-shrink: 0;
    order: 3;
    display: flex;
    align-items: center;
    gap: 0.25rem;
  }
  
  /* Hide logout button on mobile (available in drawer) */
  .header-right #logout-btn {
    display: none;
  }
  
  /* Hide refresh indicator on mobile (less clutter) */
  .header-right .refresh-indicator {
    display: none;
  }
  
  /* Settings icon sizing for mobile */
  .header-right .btn-icon {
    width: 44px;
    height: 44px;
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .header-right .btn-icon svg {
    width: 22px;
    height: 22px;
  }
}


/* ==========================================================================
   Tablet Header Layout (769px - 1024px)
   ========================================================================== */

@media (min-width: 769px) and (max-width: 1024px) {
  .header {
    padding: 0.5rem 1rem;
  }
  
  /* Tabs container: horizontal scroll for many tabs */
  .header .tabs {
    display: flex;
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    gap: 0.125rem;
    margin: 0 0.5rem;
    padding-bottom: 2px; /* Space for scrollbar */
    scrollbar-width: thin;
    scrollbar-color: var(--neon-purple) transparent;
    
    /* Smooth momentum scrolling on iOS */
    -webkit-overflow-scrolling: touch;
    
    /* Hide scrollbar visually but keep functionality */
    -ms-overflow-style: none;
  }
  
  .header .tabs::-webkit-scrollbar {
    height: 4px;
  }
  
  .header .tabs::-webkit-scrollbar-track {
    background: transparent;
  }
  
  .header .tabs::-webkit-scrollbar-thumb {
    background: rgba(191, 90, 242, 0.3);
    border-radius: 2px;
  }
  
  .header .tabs::-webkit-scrollbar-thumb:hover {
    background: rgba(191, 90, 242, 0.5);
  }
  
  /* Compact tabs for tablet */
  .header .tabs .tab {
    padding: 0.6rem 1rem;
    font-size: 0.85rem;
    white-space: nowrap;
    flex-shrink: 0;
  }
  
  /* Compact header-right for tablet */
  .header-right {
    gap: 0.5rem;
  }
  
  .header-right #logout-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
  }
}


/* ==========================================================================
   Sticky Header with Scroll Shadow
   ========================================================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

/* Scrolled state - add shadow for depth */
.header.is-scrolled {
  box-shadow: 
    0 4px 20px rgba(0, 0, 0, 0.4),
    0 0 1px rgba(191, 90, 242, 0.3);
  border-bottom-color: rgba(191, 90, 242, 0.2);
}

/* Extra shadow enhancement for mobile */
@media (max-width: 768px) {
  .header.is-scrolled {
    box-shadow: 
      0 2px 12px rgba(0, 0, 0, 0.5),
      0 0 1px rgba(191, 90, 242, 0.4);
  }
}


/* ==========================================================================
   Virtual Keyboard Handling
   ========================================================================== */

/* When virtual keyboard opens, prevent header from obscuring content */
@supports (height: 100dvh) {
  /* Use dynamic viewport height when available */
  .header {
    /* Header position adapts to visual viewport */
    position: sticky;
    top: 0;
  }
}

/* For browsers supporting keyboard-inset */
@supports (padding-bottom: env(keyboard-inset-height, 0px)) {
  /* Main content adjustment when keyboard is open */
  body.keyboard-open .tab-content {
    padding-bottom: env(keyboard-inset-height, 0px);
  }
}

/* Fallback: JavaScript will add this class when keyboard opens */
body.keyboard-open .header {
  /* Optionally make header more compact or hide on keyboard */
  /* Currently keeping visible for orientation */
}

/* Input focus scroll padding to ensure field is visible */
@media (max-width: 768px) {
  input:focus,
  textarea:focus,
  select:focus {
    scroll-padding-top: 60px; /* Account for header height */
  }
  
  /* Ensure focused elements aren't hidden behind header */
  .tab-content {
    scroll-padding-top: 60px;
  }
}


/* ==========================================================================
   Header Logo (Optional - Add to HTML if needed)
   ========================================================================== */

.header-logo {
  display: none; /* Hidden by default on desktop */
}

@media (max-width: 768px) {
  .header-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
  }
  
  .header-logo img {
    height: 28px;
    width: auto;
  }
  
  .header-logo-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }
}


/* ==========================================================================
   Safe Area Insets (Notch/Home Indicator)
   ========================================================================== */

@supports (padding-top: env(safe-area-inset-top)) {
  .header {
    /* Account for notch on modern phones */
    padding-top: max(0.5rem, env(safe-area-inset-top));
    padding-left: max(0.75rem, env(safe-area-inset-left));
    padding-right: max(0.75rem, env(safe-area-inset-right));
  }
  
  @media (max-width: 768px) {
    .header {
      padding-top: max(0.5rem, env(safe-area-inset-top));
    }
  }
}