/* Responsive Layout Styles */
/* Following desktop-first approach with mobile and tablet overrides */

/* ============================================
   BREAKPOINT DEFINITIONS
   ============================================ */
:root {
  --breakpoint-mobile: 768px;
  --breakpoint-tablet: 1024px;
  --breakpoint-desktop: 1280px;
}

/* ============================================
   DESKTOP (>= 1024px) - Default/Primary
   ============================================ */
/* Sidebar is fixed and visible by default */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: 240px;
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform 0.3s ease;
}

.main-content {
  margin-left: 240px;
  min-height: 100vh;
  background: var(--bg-app);
}

/* Mobile navigation hidden on desktop */
.mobile-nav {
  display: none;
}

/* Hamburger button hidden on desktop */
.hamburger-btn {
  display: none;
}

/* Sidebar overlay hidden on desktop */
.sidebar-overlay {
  display: none;
}

/* ============================================
   TABLET (768px - 1023px)
   ============================================ */
@media (min-width: 768px) and (max-width: 1023px) {
  /* Sidebar becomes collapsible overlay */
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 240px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 1001;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  /* Main content takes full width */
  .main-content {
    margin-left: 0;
    width: 100%;
  }

  /* Show hamburger button */
  .hamburger-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 16px;
    left: 16px;
    width: 40px;
    height: 40px;
    padding: 8px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    cursor: pointer;
    z-index: 1000;
    color: var(--text-primary);
    transition: background 0.2s ease;
  }

  .hamburger-btn:hover {
    background: var(--bg-hover);
  }

  .hamburger-btn svg {
    width: 24px;
    height: 24px;
  }

  /* Sidebar overlay backdrop */
  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(28, 25, 23, 0.4);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .sidebar-overlay.visible {
    display: block;
    opacity: 1;
  }

  /* Mobile nav still hidden on tablet */
  .mobile-nav {
    display: none;
  }

  /* Adjust main content padding for hamburger button */
  .main-content {
    padding-top: 72px;
  }
}

/* ============================================
   MOBILE (< 768px)
   ============================================ */
@media (max-width: 767px) {
  /* Hide sidebar completely */
  .sidebar {
    display: none;
  }

  /* Main content takes full width */
  .main-content {
    margin-left: 0;
    width: 100%;
    padding-bottom: 80px; /* Space for bottom nav */
  }

  /* Show mobile bottom navigation */
  .mobile-nav {
    display: flex;
    flex-direction: row;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    padding: 8px 0;
    padding-bottom: max(8px, env(safe-area-inset-bottom));
    z-index: 100;
    justify-content: space-around;
    align-items: center;
  }

  /* Hide hamburger button on mobile */
  .hamburger-btn {
    display: none;
  }

  /* Hide sidebar overlay on mobile */
  .sidebar-overlay {
    display: none;
  }

  /* Adjust card layouts for mobile */
  .card-grid {
    grid-template-columns: 1fr;
  }

  /* Stack content vertically */
  .segmented-control {
    flex-wrap: wrap;
  }

  /* Adjust modal sizing for mobile */
  .modal {
    width: 95%;
    max-width: none;
    margin: 16px;
  }

  /* Adjust table layouts for mobile */
  .contacts-table,
  .groups-table,
  .tags-table {
    overflow-x: auto;
  }

  /* Circular visualizer scaling */
  .circular-visualizer {
    transform: scale(0.8);
    transform-origin: center top;
  }
}

/* ============================================
   MOBILE NAVIGATION COMPONENT STYLES
   ============================================ */
.mobile-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.2s ease;
  text-decoration: none;
  min-width: 60px;
  flex: 1;
  max-width: 100px;
  position: relative;
}

.mobile-nav__item:hover {
  color: var(--text-primary);
}

.mobile-nav__item--active {
  color: var(--accent-primary);
}

.mobile-nav__icon {
  width: 24px;
  height: 24px;
  stroke-width: 2;
}

.mobile-nav__label {
  font-size: 11px;
  font-weight: 500;
  text-align: center;
}

/* Badge on mobile nav */
.mobile-nav__badge {
  position: absolute;
  top: 4px;
  right: 12px;
  background: var(--accent-primary);
  color: var(--text-inverse);
  padding: 2px 6px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 600;
  min-width: 18px;
  text-align: center;
}

/* ============================================
   HAMBURGER ICON STYLES
   ============================================ */
.hamburger-icon {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 20px;
  height: 16px;
}

.hamburger-icon span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Animated hamburger to X */
.hamburger-btn.open .hamburger-icon span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.hamburger-btn.open .hamburger-icon span:nth-child(2) {
  opacity: 0;
}

.hamburger-btn.open .hamburger-icon span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */
/* Hide on mobile */
@media (max-width: 767px) {
  .hide-mobile {
    display: none !important;
  }
}

/* Hide on tablet */
@media (min-width: 768px) and (max-width: 1023px) {
  .hide-tablet {
    display: none !important;
  }
}

/* Hide on desktop */
@media (min-width: 1024px) {
  .hide-desktop {
    display: none !important;
  }
}

/* Show only on mobile */
.show-mobile {
  display: none !important;
}

@media (max-width: 767px) {
  .show-mobile {
    display: block !important;
  }
}

/* Show only on tablet */
.show-tablet {
  display: none !important;
}

@media (min-width: 768px) and (max-width: 1023px) {
  .show-tablet {
    display: block !important;
  }
}

/* Show only on desktop */
.show-desktop {
  display: none !important;
}

@media (min-width: 1024px) {
  .show-desktop {
    display: block !important;
  }
}