/**
 * DS-10: Responsive Utilities & Mobile Optimizations
 * Global responsive classes and mobile-specific styles
 */

/* ========================================
 * Responsive Breakpoints (from design tokens)
 * ======================================== */
:root {
  --bp-xs: 360px;
  --bp-sm: 480px;
  --bp-md: 768px;
  --bp-lg: 1024px;
  --bp-xl: 1280px;
}

/* ========================================
 * Responsive Utility Classes
 * ======================================== */

/* Visibility Utilities */
.mobile-only {
  display: block;
}

.desktop-only {
  display: none;
}

.hide-on-small {
  display: block;
}

@media (min-width: 768px) {
  .mobile-only {
    display: none;
  }
  
  .desktop-only {
    display: block;
  }
}

@media (max-width: 767px) {
  .hide-on-small {
    display: none !important;
  }
}

/* Stack Utilities */
.stack-sm {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm, 12px);
}

.stack-md {
  display: flex;
  flex-direction: column;
  gap: var(--space-md, 16px);
}

.stack-lg {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg, 24px);
}

@media (min-width: 768px) {
  .stack-sm,
  .stack-md,
  .stack-lg {
    flex-direction: row;
  }
}

/* ========================================
 * Mobile-First Container Adjustments
 * ======================================== */

/* Prevent horizontal scrolling */
body {
  overflow-x: hidden;
  max-width: 100vw;
}

/* Mobile container padding */
@media (max-width: 767px) {
  .container,
  .page-container,
  main {
    padding-left: var(--space-md, 16px);
    padding-right: var(--space-md, 16px);
  }
}

/* ========================================
 * Bottom Navigation Bar - Mobile Hardened
 * ======================================== */

.app-nav-bottom {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background: var(--card, #161516);
  border-top: 1px solid var(--border, rgba(196, 126, 66, 0.28));
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
  
  /* Safe area insets for iPhone Dynamic Island and home bar */
  padding-bottom: max(var(--safe-area-inset-bottom, 0px), var(--space-xs, 8px));
  padding-left: max(var(--safe-area-inset-left, 0px), var(--space-xs, 8px));
  padding-right: max(var(--safe-area-inset-right, 0px), var(--space-xs, 8px));
  padding-top: var(--space-xs, 8px);
  
  display: flex;
  align-items: center;
  justify-content: space-around;
  min-height: 56px;
  height: auto;
}

.app-nav-bottom__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xxs, 4px);
  padding: var(--space-xs, 8px);
  min-height: 44px;
  min-width: 44px;
  border-radius: var(--radius-sm, 8px);
  background: transparent;
  border: none;
  color: var(--text-muted, #8C7F74);
  font-size: var(--type-micro-size, 0.8125rem);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base, 0.2s ease);
  flex: 1;
  max-width: 120px;
  text-align: center;
  position: relative;
}

.app-nav-bottom__item:active,
.app-nav-bottom__item:focus {
  outline: 2px solid var(--accent, var(--aperium-copper));
  outline-offset: -2px;
}

.app-nav-bottom__item.is-active {
  color: var(--accent, var(--aperium-copper));
  background: var(--color-surface-hover, rgba(255, 255, 255, 0.08));
}

.app-nav-bottom__item-icon {
  width: var(--icon-size-md, 20px);
  height: var(--icon-size-md, 20px);
  flex-shrink: 0;
}

.app-nav-bottom__item-label {
  font-size: var(--type-micro-size, 0.8125rem);
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* Ensure main content has bottom padding to avoid nav overlap */
@media (max-width: 767px) {
  main {
    padding-bottom: calc(56px + var(--safe-area-inset-bottom, 0px) + var(--space-lg, 24px));
  }
}

/* ========================================
 * Mobile Typography Adjustments
 * ======================================== */

@media (max-width: 767px) {
  .bb-page-title {
    font-size: clamp(1.75rem, 5vw, 2rem);
    line-height: 1.2;
  }
  
  .bb-page-subtitle {
    font-size: var(--type-body-size, 1rem);
    line-height: 1.5;
  }
  
  .bb-section-header {
    font-size: clamp(1.125rem, 3vw, 1.25rem);
    line-height: 1.3;
  }
}

/* ========================================
 * Mobile Card Adjustments
 * ======================================== */

@media (max-width: 767px) {
  .bb-card {
    padding: var(--space-md, 16px);
    border-radius: var(--radius-md, 12px);
  }
  
  .bb-card + .bb-card {
    margin-top: var(--space-md, 16px);
  }
}

/* ========================================
 * Mobile Form Controls
 * ======================================== */

@media (max-width: 767px) {
  input[type="text"],
  input[type="email"],
  input[type="number"],
  textarea,
  select {
    font-size: 16px; /* Prevents iOS zoom on focus */
    min-height: 44px;
    padding: var(--space-sm, 12px) var(--space-md, 16px);
  }
  
  button,
  .btn {
    min-height: 44px;
    min-width: 44px;
    padding: var(--space-sm, 12px) var(--space-lg, 24px);
    font-size: var(--type-body-size, 1rem);
  }
}

/* ========================================
 * Mobile Icon Sizing
 * ======================================== */

@media (max-width: 767px) {
  .bb-icon {
    width: var(--icon-size-md, 20px);
    height: var(--icon-size-md, 20px);
  }
  
  .bb-icon--sm {
    width: var(--icon-size-sm, 18px);
    height: var(--icon-size-sm, 18px);
  }
  
  .bb-icon--lg {
    width: var(--icon-size-lg, 24px);
    height: var(--icon-size-lg, 24px);
  }
}

/* ========================================
 * Mobile Grid Adjustments
 * ======================================== */

@media (max-width: 767px) {
  .grid,
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: var(--space-md, 16px);
  }
}

/* ========================================
 * Mobile Header Adjustments
 * ======================================== */

@media (max-width: 767px) {
  .app-header {
    padding: var(--space-sm, 12px) var(--space-md, 16px);
    padding-top: max(var(--safe-area-inset-top, 0px), var(--space-sm, 12px));
  }
  
  .brand-lockup {
    gap: var(--space-xs, 8px);
  }
  
  .brand-title {
    font-size: clamp(1.25rem, 4vw, 1.5rem);
  }
  
  .brand-subtitle,
  .tagline {
    display: none; /* Hide on very small screens */
  }
}

/* ========================================
 * Mobile Dropdown Adjustments
 * ======================================== */

@media (max-width: 767px) {
  .bb-identity-dropdown {
    max-width: calc(100vw - var(--space-lg, 24px));
    right: var(--space-xs, 8px);
    max-height: calc(100vh - 120px);
  }
}

/* ========================================
 * Mobile Builder Pages
 * ======================================== */

@media (max-width: 767px) {
  .builder-container {
    padding: var(--space-md, 16px);
  }
  
  .builder-card {
    padding: var(--space-md, 16px);
    margin-bottom: var(--space-md, 16px);
  }
  
  .builder-section {
    margin-bottom: var(--space-xl, 32px);
  }
}

/* ========================================
 * Mobile Event Planner
 * ======================================== */

@media (max-width: 767px) {
  .event-planner-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md, 16px);
  }
}

/* ========================================
 * Mobile Analytics
 * ======================================== */

@media (max-width: 767px) {
  .analytics-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md, 16px);
  }
  
  .analytics-metric-card {
    padding: var(--space-md, 16px);
  }
}

/* ========================================
 * Mobile TikTok Studio
 * ======================================== */

@media (max-width: 767px) {
  .tiktok-studio-container {
    flex-direction: column;
    height: auto;
  }
  
  .tiktok-studio-sidebar {
    width: 100%;
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--border, rgba(196, 126, 66, 0.28));
  }
  
  .tiktok-studio-preview {
    width: 100%;
    min-height: 60vh;
  }
}

/* ========================================
 * Landscape Mobile Adjustments
 * ======================================== */

@media (max-width: 767px) and (orientation: landscape) {
  .app-nav-bottom {
    min-height: 48px;
    padding-top: var(--space-xxs, 4px);
    padding-bottom: max(var(--safe-area-inset-bottom, 0px), var(--space-xxs, 4px));
  }
  
  .app-nav-bottom__item {
    min-height: 40px;
    gap: var(--space-2xs, 2px);
  }
  
  .app-nav-bottom__item-label {
    font-size: 0.75rem;
  }
  
  main {
    padding-bottom: calc(48px + var(--safe-area-inset-bottom, 0px) + var(--space-md, 16px));
  }
}

/* ========================================
 * Tablet Adjustments
 * ======================================== */

@media (min-width: 768px) and (max-width: 1023px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========================================
 * Touch Target Sizing
 * ======================================== */

@media (hover: none) and (pointer: coarse) {
  /* Mobile touch devices */
  button,
  .btn,
  a[role="button"],
  input[type="button"],
  input[type="submit"],
  .app-nav-bottom__item,
  .bb-identity-dropdown__item {
    min-height: 44px;
    min-width: 44px;
  }
}