/* Mobile-First Responsive CSS for Slocial */

/* ========================================
   1. BASE MOBILE STYLES (Mobile First)
   ======================================== */

/* Ensure proper viewport scaling */
html {
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* Better touch targets for mobile */
button, 
a.btn,
input[type="submit"],
input[type="button"] {
  min-height: 44px; /* iOS recommended touch target */
  min-width: 44px;
  touch-action: manipulation; /* Prevent zoom on double tap */
}

/* Improve form inputs for mobile */
input,
textarea,
select {
  font-size: 16px; /* Prevents zoom on iOS */
  -webkit-appearance: none;
  appearance: none;
  border-radius: 8px;
  width: 100%;
  box-sizing: border-box;
}

/* Better spacing for mobile */
.container {
  padding: 12px;
  max-width: 100%;
}

/* ========================================
   2. NAVIGATION - MOBILE OPTIMIZED
   ======================================== */

/* Mobile navigation overhaul */
@media (max-width: 639px) {
  .nav {
    padding: 8px 12px;
    gap: 4px;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
  }
  
  /* Push content down to account for fixed nav */
  body {
    padding-top: 60px;
  }
  
  .nav-left,
  .nav-right {
    width: 100%;
    justify-content: space-between;
  }
  
  .nav-left {
    order: 1;
  }
  
  .nav-right {
    order: 2;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
  }
  
  /* Hide member count on mobile */
  .nav-left .member-count {
    display: none !important;
  }
  
  /* Better spacing for nav links */
  .nav a {
    padding: 8px 4px;
    margin: 0 4px;
  }
  
  /* Optimize dropdown for mobile */
  .nav-dropdown-menu {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    width: 100%;
    border-radius: 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  }
  
  .nav-dropdown-menu a {
    padding: 16px;
    font-size: 16px;
    border-bottom: 1px solid var(--border);
  }
  
  /* Mobile handle display */
  .nav .handle {
    display: none; /* Hide on mobile to save space */
  }
}

/* ========================================
   3. FEED & LETTERS - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  .feed .letter {
    margin: 8px 0;
    padding: 12px;
    border-radius: 8px;
  }
  
  .feed .letter h2 {
    font-size: 18px;
    line-height: 1.3;
    margin: 8px 0;
  }
  
  .feed .letter .meta {
    font-size: 11px;
  }
  
  /* Better touch targets for letter actions */
  .feed .letter .actions {
    gap: 8px;
    margin-top: 12px;
  }
  
  .feed .letter .actions button,
  .feed .letter .actions .btn {
    padding: 10px 16px;
    font-size: 14px;
    flex: 1;
    min-width: auto;
  }
  
  /* Stack author info on mobile */
  .feed-author {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  /* Format badges optimized for mobile */
  .format-badge {
    font-size: 10px;
    padding: 2px 6px;
  }
}

/* ========================================
   4. MODALS - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  .modal-content {
    width: 100%;
    height: 100%;
    max-width: 100%;
    max-height: 100%;
    border-radius: 0;
    padding: 1rem;
    margin: 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
  }
  
  .modal-header h2 {
    font-size: 1.25rem;
  }
  
  .close-modal {
    font-size: 1.75rem;
    padding: 8px;
    min-width: 44px;
    min-height: 44px;
  }
  
  .modal-footer {
    position: sticky;
    bottom: 0;
    background: var(--card);
    padding: 1rem;
    margin: -1rem;
    margin-top: 1rem;
    border-top: 2px solid var(--border);
  }
  
  .modal-footer button {
    width: 100%;
    margin-bottom: 8px;
  }
}

/* ========================================
   5. FORMS - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  /* Stack form elements */
  form {
    gap: 16px;
  }
  
  /* Full-width buttons on mobile */
  form button[type="submit"],
  form .btn {
    width: 100%;
    padding: 14px;
    font-size: 16px;
  }
  
  /* Better textarea for mobile */
  textarea {
    min-height: 120px;
    resize: vertical;
  }
  
  /* Character counter positioning */
  .char-count {
    font-size: 11px;
    text-align: right;
    margin-top: 4px;
  }
  
  /* Radio and checkbox improvements */
  input[type="radio"],
  input[type="checkbox"] {
    width: 20px;
    height: 20px;
    min-width: 20px;
    min-height: 20px;
    margin-right: 8px;
  }
  
  /* Form labels */
  label {
    font-size: 14px;
    margin-bottom: 6px;
    display: block;
  }
}

/* ========================================
   6. COMPOSE PAGE - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  /* Compose form improvements */
  .compose-container {
    padding: 8px;
  }
  
  .compose-form textarea {
    min-height: 200px;
    font-size: 16px;
  }
  
  /* Tag selector for mobile */
  .tag-selector {
    margin-top: 12px;
  }
  
  .tag-search-input {
    width: 100%;
    padding: 12px;
    font-size: 16px;
  }
  
  .tag-suggestions {
    max-height: 150px;
    position: static;
    margin-top: 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
  }
  
  .selected-tags {
    gap: 6px;
    margin-top: 8px;
  }
  
  .tag-pill {
    padding: 6px 10px;
    font-size: 12px;
  }
  
  /* Stack buttons on mobile */
  .compose-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }
  
  .compose-actions button {
    width: 100%;
  }
}

/* ========================================
   7. PROFILE PAGE - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  .profile-container {
    padding: 12px;
  }
  
  .profile-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  
  .profile-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    width: 100%;
  }
  
  .stat-item {
    text-align: center;
    padding: 12px;
    background: var(--hover-bg);
    border-radius: 8px;
  }
  
  .stat-value {
    font-size: 20px;
    font-weight: bold;
    display: block;
  }
  
  .stat-label {
    font-size: 11px;
    color: var(--muted);
    margin-top: 4px;
  }
}

/* ========================================
   8. MOSAICS/TAGS - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  /* Tag grid for mobile */
  .tags-grid {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 12px;
  }
  
  .tag-card {
    padding: 16px;
  }
  
  .tag-image-container {
    height: 120px;
    margin-bottom: 12px;
  }
  
  .tag-name {
    font-size: 18px;
  }
  
  .tag-description {
    font-size: 13px;
    line-height: 1.4;
  }
  
  .tag-actions {
    margin-top: 12px;
  }
  
  .tag-actions button,
  .tag-actions .btn {
    width: 100%;
    padding: 12px;
    font-size: 14px;
  }
  
  /* Instant badge positioning */
  .instant-badge {
    font-size: 10px;
    padding: 4px 8px;
    top: 8px;
    right: 8px;
  }
}

/* ========================================
   9. LOGIN/SIGNUP - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  .auth-container {
    padding: 20px 16px;
    min-height: calc(100vh - 60px);
  }
  
  .auth-box {
    width: 100%;
    max-width: 100%;
    padding: 20px;
    border-radius: 12px;
    box-shadow: none;
    border: 1px solid var(--border);
  }
  
  .logo-container {
    margin-bottom: 20px;
  }
  
  .logo-image {
    max-width: 120px;
    height: auto;
  }
  
  .auth-title {
    font-size: 24px;
    margin-bottom: 20px;
  }
  
  .oauth-btn {
    width: 100%;
    padding: 14px;
    font-size: 16px;
    margin-bottom: 12px;
  }
  
  .divider {
    margin: 20px 0;
    font-size: 12px;
  }
}

/* ========================================
   10. FOOTER - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  footer {
    position: relative; /* Not fixed on mobile */
    margin-top: 40px;
  }
  
  .footer-inner {
    padding: 16px 12px;
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
  
  .footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }
  
  .footer-nav a {
    padding: 4px 8px;
    font-size: 13px;
  }
  
  .theme-toggle {
    width: 100%;
    max-width: 200px;
    margin: 0 auto;
  }
}

/* ========================================
   11. UTILITIES & HELPERS
   ======================================== */

/* Hide on mobile */
@media (max-width: 639px) {
  .mobile-hide {
    display: none !important;
  }
}

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

@media (max-width: 639px) {
  .mobile-only {
    display: block;
  }
}

/* Better scrolling on mobile */
@media (max-width: 639px) {
  * {
    -webkit-overflow-scrolling: touch;
  }
  
  /* Prevent horizontal scroll */
  body {
    overflow-x: hidden;
  }
  
  /* Ensure content doesn't overflow */
  img, 
  video, 
  iframe {
    max-width: 100%;
    height: auto;
  }
}

/* ========================================
   12. READING PAGE - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  /* Letter content */
  .letter-content {
    font-size: 15px;
    line-height: 1.6;
    padding: 12px;
  }
  
  .letter-content p {
    margin-bottom: 1em;
  }
  
  /* Reading status buttons */
  .reading-status {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card);
    border-top: 1px solid var(--border);
    padding: 12px;
    display: flex;
    gap: 8px;
    z-index: 100;
  }
  
  .reading-status button {
    flex: 1;
    padding: 12px 8px;
    font-size: 13px;
  }
  
  /* Adjust content for fixed reading bar */
  .letter-page {
    padding-bottom: 80px;
  }
}

/* ========================================
   13. ABOUT PAGE - MOBILE OPTIMIZED
   ======================================== */

@media (max-width: 639px) {
  .about-container {
    padding: 16px;
  }
  
  .about-section {
    margin-bottom: 32px;
  }
  
  .about-section h2 {
    font-size: 20px;
    margin-bottom: 12px;
  }
  
  .quote-block {
    padding: 16px;
    margin: 16px 0;
    font-size: 14px;
  }
  
  .principles-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .principle-card {
    padding: 16px;
  }
  
  .principle-card h3 {
    font-size: 16px;
  }
  
  .principle-card p {
    font-size: 13px;
  }
  
  /* Mosaic animation - simpler on mobile */
  .mosaic-container {
    height: 150px;
    margin: 20px 0;
  }
  
  .mosaic-piece {
    font-size: 1.2rem !important;
  }
}

/* ========================================
   14. PERFORMANCE OPTIMIZATIONS
   ======================================== */

@media (max-width: 639px) {
  /* Reduce animations on mobile for better performance */
  * {
    animation-duration: 0.2s !important;
  }
  
  /* Disable hover effects on touch devices */
  @media (hover: none) {
    .feed .letter:hover {
      transform: none;
      box-shadow: 0 1px 2px var(--shadow-light), 0 6px 18px var(--shadow-heavy);
    }
    
    button:hover,
    .btn:hover {
      background: var(--card);
    }
  }
}

/* ========================================
   15. TABLET STYLES (640px - 1024px)
   ======================================== */

@media (min-width: 640px) and (max-width: 1024px) {
  .container {
    max-width: 100%;
    padding: 20px;
  }
  
  .tags-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .modal-content {
    width: 80%;
    max-width: 600px;
  }
  
  .nav {
    padding: 12px 20px;
  }
}