/**
 * Mobile-First Responsive Design
 * Youth Resources Section
 * 
 * Requirements: 13.1, 13.2, 13.3, 13.7
 * - Mobile-first breakpoints
 * - Touch-friendly tap targets (44x44px minimum)
 * - Optimized filter UI for small screens
 * - Responsive typography and spacing
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
  /* Breakpoints */
  --breakpoint-xs: 320px;
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;

  /* Touch Target Sizes */
  --touch-target-min: 44px;
  --touch-target-comfortable: 48px;
  --touch-target-large: 56px;

  /* Spacing Scale (Mobile-First) */
  --spacing-xs: 0.25rem; /* 4px */
  --spacing-sm: 0.5rem; /* 8px */
  --spacing-md: 1rem; /* 16px */
  --spacing-lg: 1.5rem; /* 24px */
  --spacing-xl: 2rem; /* 32px */
  --spacing-2xl: 3rem; /* 48px */
  --spacing-3xl: 4rem; /* 64px */

  /* Typography Scale (Mobile-First) */
  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.25rem; /* 20px */
  --font-size-2xl: 1.5rem; /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem; /* 36px */

  /* Line Heights */
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

/* ============================================
   BASE MOBILE STYLES
   ============================================ */

/* Ensure proper box-sizing */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Mobile-first body styles */
body {
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
}

/* Container with mobile-first padding */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

/* ============================================
   TYPOGRAPHY - MOBILE FIRST
   ============================================ */

/* Headings - Mobile sizes */
h1,
.h1 {
  font-size: var(--font-size-3xl);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-lg);
}

h2,
.h2 {
  font-size: var(--font-size-2xl);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h3,
.h3 {
  font-size: var(--font-size-xl);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h4,
.h4 {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-normal);
  margin-bottom: var(--spacing-sm);
}

/* Body text */
p {
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-relaxed);
}

/* ============================================
   TOUCH-FRIENDLY INTERACTIVE ELEMENTS
   ============================================ */

/* All buttons and links must meet minimum touch target */
button,
.btn,
a.button,
input[type="button"],
input[type="submit"],
input[type="reset"] {
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Touch-friendly form inputs */
input[type="text"],
input[type="email"],
input[type="search"],
input[type="tel"],
input[type="url"],
textarea,
select {
  min-height: var(--touch-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  border-radius: 8px;
  width: 100%;
}

/* Larger tap targets for primary actions */
.btn-primary,
.btn-cta {
  min-height: var(--touch-target-comfortable);
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
}

/* ============================================
   GRID LAYOUTS - MOBILE FIRST
   ============================================ */

/* Resource grid - single column on mobile */
.resource-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  padding: var(--spacing-md) 0;
}

/* Category grid - single column on mobile */
.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

/* Filter grid - stacked on mobile */
.filter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

/* ============================================
   MOBILE-OPTIMIZED COMPONENTS
   ============================================ */

/* Mobile-optimized filter panel */
.filter-panel {
  position: relative;
  background: var(--youth-bg, #ffffff);
  border-radius: 12px;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.filter-panel__header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.filter-panel__title {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.filter-panel__clear-btn {
  width: 100%;
  min-height: var(--touch-target-min);
}

/* Mobile-optimized search */
.search-box {
  width: 100%;
  min-height: var(--touch-target-comfortable);
  padding: var(--spacing-md);
  font-size: var(--font-size-base);
  border-radius: 12px;
}

/* Mobile-optimized resource cards */
.resource-card {
  display: flex;
  flex-direction: column;
  border-radius: 12px;
  overflow: hidden;
}

.resource-card__content {
  padding: var(--spacing-md);
}

.resource-card__title {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-sm);
}

.resource-card__description {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-md);
}

/* Mobile-optimized badges */
.badge {
  padding: 0.375rem 0.75rem;
  font-size: var(--font-size-xs);
  border-radius: 6px;
  white-space: nowrap;
}

/* Mobile-optimized engagement buttons */
.engagement-btn {
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
  padding: var(--spacing-sm) var(--spacing-md);
  gap: var(--spacing-sm);
}

/* ============================================
   MOBILE NAVIGATION
   ============================================ */

/* Mobile-friendly navigation */
.nav-menu {
  display: none;
}

.nav-toggle {
  display: block;
  min-height: var(--touch-target-min);
  min-width: var(--touch-target-min);
}

/* Mobile bottom navigation spacing */
body {
  padding-bottom: 80px; /* Space for bottom nav */
}

/* ============================================
   TABLET BREAKPOINT (640px+)
   ============================================ */

@media (min-width: 640px) {
  /* Container padding increase */
  .container {
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }

  /* Typography scale up */
  h1,
  .h1 {
    font-size: var(--font-size-4xl);
  }

  h2,
  .h2 {
    font-size: var(--font-size-3xl);
  }

  /* Two-column grids */
  .resource-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  /* Filter panel horizontal layout */
  .filter-panel__header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .filter-panel__clear-btn {
    width: auto;
  }

  /* Two-column filter grid */
  .filter-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================
   DESKTOP BREAKPOINT (768px+)
   ============================================ */

@media (min-width: 768px) {
  /* Container max-width */
  .container {
    max-width: var(--container-md);
  }

  /* Three-column grids */
  .resource-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* Horizontal filter layout */
  .filter-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  /* Larger spacing */
  .filter-panel {
    padding: var(--spacing-lg);
  }

  .resource-card__content {
    padding: var(--spacing-lg);
  }

  /* Show desktop navigation */
  .nav-menu {
    display: block;
  }

  .nav-toggle {
    display: none;
  }

  /* Remove bottom nav spacing */
  body {
    padding-bottom: 0;
  }

  .youth-mobile-bottom-nav {
    display: none;
  }
}

/* ============================================
   LARGE DESKTOP BREAKPOINT (1024px+)
   ============================================ */

@media (min-width: 1024px) {
  /* Container max-width */
  .container {
    max-width: var(--container-lg);
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
  }

  /* Four-column grids */
  .resource-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
  }

  /* Typography scale up */
  h1,
  .h1 {
    font-size: 3rem;
  }

  /* Larger spacing */
  .filter-panel {
    padding: var(--spacing-xl);
  }
}

/* ============================================
   EXTRA LARGE DESKTOP BREAKPOINT (1280px+)
   ============================================ */

@media (min-width: 1280px) {
  /* Container max-width */
  .container {
    max-width: var(--container-xl);
  }

  /* Optional: 5-column grid for very large screens */
  .resource-grid--wide {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* ============================================
   TOUCH DEVICE OPTIMIZATIONS
   ============================================ */

/* Detect touch devices */
@media (hover: none) and (pointer: coarse) {
  /* Increase all tap targets */
  button,
  .btn,
  a.button {
    min-height: var(--touch-target-comfortable);
    padding: var(--spacing-md) var(--spacing-lg);
  }

  /* Larger form inputs */
  input,
  textarea,
  select {
    min-height: var(--touch-target-comfortable);
    font-size: 16px; /* Prevents zoom on iOS */
  }

  /* Remove hover effects on touch devices */
  .resource-card:hover {
    transform: none;
  }

  /* Increase spacing between interactive elements */
  .engagement-btn {
    margin: var(--spacing-xs);
  }

  /* Larger filter options */
  .filter-option {
    min-height: var(--touch-target-comfortable);
    padding: var(--spacing-md);
  }

  /* Larger checkbox hit areas */
  .filter-option__checkbox {
    width: 24px;
    height: 24px;
  }
}

/* ============================================
   REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================
   HIGH CONTRAST MODE
   ============================================ */

@media (prefers-contrast: high) {
  button,
  .btn {
    border: 2px solid currentColor;
  }

  .resource-card {
    border: 2px solid currentColor;
  }

  .badge {
    border: 1px solid currentColor;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  /* Hide interactive elements */
  .filter-panel,
  .nav-toggle,
  .youth-mobile-bottom-nav,
  .engagement-btn,
  button {
    display: none !important;
  }

  /* Optimize for print */
  .resource-card {
    page-break-inside: avoid;
    break-inside: avoid;
  }

  /* Remove shadows and backgrounds */
  .resource-card,
  .filter-panel {
    box-shadow: none;
    background: white;
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Responsive visibility utilities */
.mobile-only {
  display: block;
}

.tablet-up {
  display: none;
}

.desktop-up {
  display: none;
}

@media (min-width: 640px) {
  .mobile-only {
    display: none;
  }

  .tablet-up {
    display: block;
  }
}

@media (min-width: 768px) {
  .desktop-up {
    display: block;
  }
}

/* Responsive spacing utilities */
.spacing-mobile {
  padding: var(--spacing-md);
}

.spacing-tablet {
  padding: var(--spacing-md);
}

.spacing-desktop {
  padding: var(--spacing-md);
}

@media (min-width: 640px) {
  .spacing-tablet {
    padding: var(--spacing-lg);
  }
}

@media (min-width: 768px) {
  .spacing-desktop {
    padding: var(--spacing-xl);
  }
}

/* Responsive text alignment */
.text-center-mobile {
  text-align: center;
}

@media (min-width: 768px) {
  .text-center-mobile {
    text-align: left;
  }
}

/* Touch-friendly spacing */
.touch-spacing {
  margin: var(--spacing-sm);
}

@media (hover: none) and (pointer: coarse) {
  .touch-spacing {
    margin: var(--spacing-md);
  }
}