/* =========================================
   MOBILE RESPONSIVE STYLES
   Breakpoints: 
   - Tablet/Mobile: < 768px
   - Small Mobile: < 480px
   ========================================= */

@media (max-width: 768px) {
  /* --- SIDEBAR & LAYOUT --- */
  .sidebar {
    transform: translateX(-100%); /* Hide sidebar off-screen by default */
    width: 260px; /* Ensure fixed width when open */
    transition: transform 0.3s ease-in-out;
    z-index: 50; /* Above everything */
    box-shadow: 5px 0 15px rgba(0, 0, 0, 0.2);
  }

  /* Class added via JS when hamburger is clicked */
  .sidebar.mobile-open {
    transform: translateX(0);
  }

  /* Sidebar Overlay (Backdrop) */
  .sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 40;
    display: none; /* Hidden by default */
    opacity: 0;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(2px);
  }

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

  .main-content {
    margin-left: 0 !important; /* Remove sidebar gap */
    width: 100%;
    padding-bottom: 80px; /* Extra space for bottom nav/input */
  }

  body.sidebar-collapsed .main-content {
    margin-left: 0;
  }

  /* --- CHAT INPUT AREA (Floating Bottom) --- */
  .input-area-container {
    left: 0 !important; /* Stretch full width */
    padding: 1rem;
    bottom: 0;
    background: var(--bg-body); /* Solid bg on mobile for readability */
    border-top: 1px solid var(--border-color);
  }

  body.sidebar-collapsed .input-area-container {
    left: 0;
  }

  .input-box-wrapper {
    border-radius: 1rem;
    box-shadow: none;
    border: 1px solid var(--border-color);
  }

  /* --- CHAT BUBBLES --- */
  .ai-msg,
  .user-msg {
    max-width: 95%; /* Wider bubbles on phone */
    font-size: 0.95rem;
  }

  /* --- COMPARE PAGE (Diff View) --- */
  .simple-container,
  .diff-container {
    flex-direction: column; /* Stack columns vertically */
    gap: 15px;
  }

  .column-box,
  .diff-column {
    width: 100%;
    overflow-x: auto; /* Scroll horizontal code blocks */
  }

  /* --- ACTION BUTTONS --- */
  .action-buttons-row {
    gap: 8px;
    justify-content: flex-start; /* Align left */
    overflow-x: auto; /* Allow scrolling if too many buttons */
    padding-bottom: 5px;
    flex-wrap: nowrap; /* Keep in one row scrollable or wrap? Let's wrap for better visibility */
    flex-wrap: wrap;
  }

  .minimal-btn {
    flex: 1 1 auto; /* Grow to fill space */
    justify-content: center;
    white-space: nowrap;
    padding: 8px 12px;
  }

  /* --- DIAGRAMS --- */
  #mindmapContainer {
    height: 300px; /* Fixed height for mobile */
  }

  #diagramWrapper.fullscreen {
    z-index: 99999; /* Ensure it covers everything */
  }

  /* --- FONTS & INPUTS --- */
  h1 {
    font-size: 1.5rem !important;
  }
  h2 {
    font-size: 1.25rem !important;
  }

  /* Prevent iOS zoom on focus */
  input,
  select,
  textarea {
    font-size: 16px !important;
  }
}

/* --- SMALL MOBILE TWEAKS --- */
@media (max-width: 480px) {
  #msgInput {
    width: 10px;
  }
  .send-btn-float {
    width: 28px;
    height: 28px;
  }

  .chat-input {
    font-size: 0.9rem;
  }

  .card {
    padding: 1rem; /* Less padding on cards */
  }

  .text-chatgpt-subtle {
    font-size: 11px;
  }
  .input-area-container {
    padding-bottom: 2px !important;
  }

  .input-box-wrapper {
    padding-bottom: 5px !important;
  }

  .border-chatgpt-border {
    padding: 1rem !important;
  }
  .sidebar-footer {
    padding-bottom: 1px !important;
  }
}