/* public/css/style.css – Consolidated and Revamped
 * Last Updated: 2025-05-25
 * - Default dark mode support (initial HTML class).
 * - Revamped light mode theme for better aesthetics.
 * - Enhanced CSS variables for clarity and theme consistency.
 * - Improved base typography and element styling.
 * - Refined component styles (buttons, forms, cards, alerts).
 * - Ensured responsive utilities are clear and effective.
 * - Added explicit styles for #fileContentModal to control visibility and transitions.
 * - Base styles for new global mobile navigation panel.
 * - Styles for .nav-link class in header.
 */

/* -------------------------------------------------------------------------- */
/* CSS Variables                                                              */
/* -------------------------------------------------------------------------- */
:root {
  --header-height: 64px;
  --footer-height: 50px;

  /* Color Palette (Example RGBs for use in rgba()) */
  /* Primary Blue (Example: Tailwind Indigo) */
  --color-primary-50-rgb: 239, 246, 255; /* For primary-50 */
  --color-primary-100-rgb: 219, 234, 254; /* For primary-100 */
  --color-primary-400-rgb: 96, 165, 250;  /* For primary-400 (Dark mode primary) */
  --color-primary-600-rgb: 37, 99, 235;   /* For primary-600 (Light mode primary) */

  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-300: #93c5fd;
  --color-primary-400: #60a5fa; /* Main Primary for Dark Theme */
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb; /* Main Primary for Light Theme */
  --color-primary-700: #1d4ed8;
  --color-primary-800: #1e40af;
  --color-primary-900: #1e3a8a;

  /* Neutral Grays (Example: Tailwind Slate) */
  --color-secondary-50: #f8fafc;  /* Lightest Gray - New bg-light */
  --color-secondary-100: #f1f5f9;
  --color-secondary-200: #e2e8f0;
  --color-secondary-300: #cbd5e1; /* Light border */
  --color-secondary-400: #94a3b8; /* Muted text dark */
  --color-secondary-500: #64748b; /* Muted text light */
  --color-secondary-600: #475569; /* Darker secondary / hover light */
  --color-secondary-700: #334155; /* Dark border / input bg dark */
  --color-secondary-800: #1e293b; /* Card bg dark / text light */
  --color-secondary-850: #171e2b; /* Slightly darker for main chat area background in dark mode */
  --color-secondary-900: #0f172a; /* BG dark */


  --color-danger-500: #ef4444;
  --color-danger2-500: #60a6fb; /* Corrected: Added semicolon */
  --color-danger-600: #dc2626;
  --color-success-500: #10b981;
  --color-success-600: #059669;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;
  --color-info-500: #3b82f6; /* Same as primary-500 */
  --color-info-600: #2563eb; /* Same as primary-600 */


  /* Light Theme - REVAMPED */
  --primary-light: var(--color-primary-600);
  --primary-hover-light: var(--color-primary-700);
  --secondary-light: var(--color-secondary-600);
  --secondary-hover-light: var(--color-secondary-700);
  --text-light: var(--color-secondary-800);
  --text-muted-light: var(--color-secondary-500);
  --bg-light: var(--color-secondary-50); /* Very light gray for main page background */
  --card-bg-light: #ffffff;
  --border-light: var(--color-secondary-300);
  --input-bg-light: #ffffff;
  --input-border-light: var(--color-secondary-300);
  --input-focus-ring-light: rgba(var(--color-primary-600-rgb), 0.25);


  /* Dark Theme */
  --primary-dark: var(--color-primary-400);
  --primary-hover-dark: var(--color-primary-500);
  --secondary-dark: var(--color-secondary-400);
  --secondary-hover-dark: var(--color-secondary-500);
  --text-dark: var(--color-secondary-100);
  --text-muted-dark: var(--color-secondary-400);
  --bg-dark: var(--color-secondary-900);
  --card-bg-dark: var(--color-secondary-800);
  --border-dark: var(--color-secondary-700);
  --input-bg-dark: var(--color-secondary-700);
  --input-border-dark: var(--color-secondary-600);
  --input-focus-ring-dark: rgba(var(--color-primary-400-rgb), 0.3);

  /* Transitions & Shadows */
  --transition-fast: all 0.15s ease-in-out;
  --transition-std: all 0.25s ease-in-out;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --border-radius: 0.375rem; /* 6px */
  --border-radius-lg: 0.5rem; /* 8px */
  --border-radius-xl: 0.75rem; /* 12px */
}

/* -------------------------------------------------------------------------- */
/* Minimal Tailwind-style responsive utilities                                */
/* -------------------------------------------------------------------------- */
.hidden { display: none !important; }
.block { display: block !important; }
.inline-block { display: inline-block !important; }
.flex { display: flex !important; }
.inline-flex { display: inline-flex !important; }
.grid { display: grid !important; }

@media (min-width: 640px) { /* sm */
  .sm\:hidden { display: none !important; } .sm\:block { display: block !important; } .sm\:inline-block { display: inline-block !important; } .sm\:flex { display: flex !important; }
}
@media (min-width: 768px) { /* md */
  .md\:hidden { display: none !important; } .md\:block { display: block !important; } .md\:inline-block { display: inline-block !important; } .md\:flex { display: flex !important; } .md\:grid { display: grid !important; }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; } .md\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
}
@media (min-width: 1024px) { /* lg */
  .lg\:hidden { display: none !important; } .lg\:block { display: block !important; } .lg\:inline-block { display: inline-block !important; } .lg\:flex { display: flex !important; } .lg\:grid { display: grid !important; }
  .lg\:grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; } .lg\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)) !important; }
}
@media (min-width: 1280px) { /* xl */
  .xl\:hidden { display: none !important; } .xl\:block { display: block !important; } .xl\:inline-block { display: inline-block !important; } .xl\:flex { display: flex !important; } .xl\:grid { display: grid !important; }
  .xl\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)) !important; }
}

/* -------------------------------------------------------------------------- */
/* Resets & Base                                                              */
/* -------------------------------------------------------------------------- */
html {
  box-sizing: border-box;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  height: 100%;
  scroll-behavior: smooth;
}
*, *::before, *::after {
  box-sizing: inherit;
  border-width: 0;
  border-style: solid;
  border-color: var(--border-light);
}
.dark *, .dark *::before, .dark *::after {
  border-color: var(--border-dark);
}

body {
  margin: 0;
  background-color: var(--bg-light);
  color: var(--text-light);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-top: var(--header-height);
  transition: background-color var(--transition-std), color var(--transition-std);
}
.dark body {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

svg:not(.icon-raw) { width: 1.25rem; height: 1.25rem; }
.icon-sm:not(.icon-raw) { width: 1rem !important; height: 1rem !important; }
.icon:not(.icon-raw) { width: 1.25rem !important; height: 1.25rem !important; }
.icon-lg:not(.icon-raw) { width: 1.5rem !important; height: 1.5rem !important; }

/* -------------------------------------------------------------------------- */
/* Layout                                                                     */
/* -------------------------------------------------------------------------- */
header.fixed-header { /* Base styles, aesthetic overrides in layout.css */
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  height: var(--header-height);
  background-color: var(--card-bg-light);
  box-shadow: var(--shadow-sm);
  border-bottom-width: 1px;
}
.dark header.fixed-header { background-color: var(--card-bg-dark); }

main#main-content {
  flex-grow: 1; overflow-y: auto; display: flex; flex-direction: column; width: 100%;
  padding-bottom: var(--footer-height);
}

footer.fixed-footer {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 50;
  height: var(--footer-height);
  background-color: var(--card-bg-light);
  box-shadow: 0 -1px 3px rgba(0,0,0,.05);
  border-top-width: 1px;
}
.dark footer.fixed-footer { background-color: var(--card-bg-dark); box-shadow: 0 -1px 3px rgba(0,0,0,.2); }

.container {
  width: 100%; max-width: 1280px; margin-left: auto; margin-right: auto;
  padding-left: 1rem; padding-right: 1rem;
}
@media (min-width: 640px) { .container { padding-left: 1.5rem; padding-right: 1.5rem; } }
@media (min-width: 1024px) { .container { padding-left: 2rem; padding-right: 2rem; } }

.py-8 { padding-top: 2rem; padding-bottom: 2rem; } .py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.mb-6 { margin-bottom: 1.5rem; } .mb-8 { margin-bottom: 2rem; } .mt-auto { margin-top: auto; }

/* -------------------------------------------------------------------------- */
/* Typography                                                                 */
/* -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 { margin-top: 0; margin-bottom: 0.75em; font-weight: 600; line-height: 1.3; color: var(--text-light); }
.dark h1, .dark h2, .dark h3, .dark h4, .dark h5, .dark h6 { color: var(--text-dark); }
h1 { font-size: 2.25rem; letter-spacing: -0.025em; } h2 { font-size: 1.875rem; letter-spacing: -0.025em; }
h3 { font-size: 1.5rem; } h4 { font-size: 1.25rem; } h5 { font-size: 1.125rem; } h6 { font-size: 1rem; }
p { margin: 0 0 1rem; line-height: 1.6; }
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition-fast); }
a:hover { text-decoration: underline; color: var(--primary-hover-light); }
.dark a { color: var(--primary-dark); } .dark a:hover { color: var(--primary-hover-dark); }

.text-center { text-align: center; } .text-sm { font-size: 0.875rem; } .text-xs { font-size: 0.75rem; }
.font-bold { font-weight: 700; } .font-semibold { font-weight: 600; } .font-medium { font-weight: 500; }
.whitespace-nowrap { white-space: nowrap; }
.sr-only { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0; }

/* -------------------------------------------------------------------------- */
/* Components (Cards, Buttons, Forms, Alerts)                                 */
/* -------------------------------------------------------------------------- */
.card {
  background-color: var(--card-bg-light); border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md); padding: 1.5rem; border-width: 1px;
  border-color: var(--border-light); /* Your custom border for cards */
}
.dark .card {
  background-color: var(--card-bg-dark);
  border-color: var(--border-dark);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.625rem 1.25rem; border-radius: var(--border-radius); border-width: 1px;
  border-color: transparent; cursor: pointer; font-weight: 500; text-align: center;
  transition: var(--transition-fast); font-size: 0.875rem; line-height: 1.25rem; white-space: nowrap;
}
.btn:focus-visible { outline: 2px solid var(--primary-light); outline-offset: 2px; }
.dark .btn:focus-visible { outline-color: var(--primary-dark); }

.btn-primary { background-color:var(--primary-light);color:white;border-color:var(--primary-light); }
.btn-primary:hover { background-color:var(--primary-hover-light);border-color:var(--primary-hover-light); }
.dark .btn-primary { background-color:var(--primary-dark);color:var(--color-secondary-900);border-color:var(--primary-dark); }
.dark .btn-primary:hover { background-color:var(--primary-hover-dark);border-color:var(--primary-hover-dark); }

.btn-secondary { background-color:var(--secondary-light);color:white;border-color:var(--secondary-light); }
.btn-secondary:hover { background-color:var(--secondary-hover-light);border-color:var(--secondary-hover-light); }
.dark .btn-secondary { background-color:var(--secondary-dark);color:var(--color-secondary-900);border-color:var(--secondary-dark); }
.dark .btn-secondary:hover { background-color:var(--secondary-hover-dark);border-color:var(--secondary-hover-dark); }

.btn-danger { background-color:var(--color-danger2-500);color:white;border-color:var(--color-danger-600); }
.btn-danger:hover { background-color:var(--color-danger-600);border-color:var(--color-danger-500); }
.dark .btn-danger { background-color:var(--color-secondary-900);color:white;border-color:var(--color-danger-600); }
.dark .btn-danger:hover { background-color:var(--color-danger-600);border-color:var(--color-danger-500); }


.btn:disabled, .btn[disabled] { opacity: 0.6; cursor: not-allowed; }

label { display:block;margin-bottom:0.375rem;font-weight:500;font-size:0.875rem;color:var(--text-light); }
.dark label { color: var(--text-dark); }

input[type="text"], input[type="email"], input[type="password"], input[type="number"], input[type="date"], textarea, select {
  width:100%; padding:0.625rem 0.875rem; border-width:1px; border-color:var(--input-border-light);
  border-radius:var(--border-radius); background-color:var(--input-bg-light); color:var(--text-light);
  font-size:0.875rem; transition: border-color var(--transition-fast), box-shadow var(--transition-fast); line-height:1.5;
}
.dark input[type="text"], .dark input[type="email"], .dark input[type="password"], .dark input[type="number"], .dark input[type="date"], .dark textarea, .dark select {
  background-color:var(--input-bg-dark); border-color:var(--input-border-dark); color:var(--text-dark);
}
input:focus, textarea:focus, select:focus {
  outline:none; border-color:var(--primary-light); box-shadow:0 0 0 3px var(--input-focus-ring-light);
}
.dark input:focus, .dark textarea:focus, .dark select:focus {
  border-color:var(--primary-dark); box-shadow:0 0 0 3px var(--input-focus-ring-dark);
}
textarea { resize: vertical; min-height: 80px; }

.alert { padding:0.875rem 1.25rem;margin-bottom:1rem;border-radius:var(--border-radius);border-width:1px;font-size:0.875rem; }
.alert-danger { color: #7f1d1d; background-color: #fee2e2; border-color: #fca5a5; }
.dark .alert-danger { color: #fecaca; background-color: rgba(185, 28, 28, 0.25); border-color: rgba(185, 28, 28, 0.6); }
.alert-success { color: #065f46; background-color: #d1fae5; border-color: #6ee7b7; }
.dark .alert-success { color: #a7f3d0; background-color: rgba(5, 124, 80, 0.25); border-color: rgba(5, 124, 80, 0.6); }
.alert-warning { color: #854d0e; background-color: #fef3c7; border-color: #fcd34d; }
.dark .alert-warning { color: #fde68a; background-color: rgba(180, 83, 9, 0.25); border-color: rgba(180, 83, 9, 0.6); }
.alert-info { color: #1e40af; background-color: #dbeafe; border-color: #93c5fd; }
.dark .alert-info { color: #bfdbfe; background-color: rgba(30, 58, 138, 0.25); border-color: rgba(30, 58, 138, 0.6); }

/* -------------------------------------------------------------------------- */
/* Dashboard specific base styles                                             */
/* -------------------------------------------------------------------------- */
.dashboard-chat-container { display:flex; flex-direction:column; flex-grow:1; overflow:hidden; }
@media (min-width:768px) { .dashboard-chat-container { flex-direction:row; } }

.dashboard-chat-container > aside#sidebar {
  flex-shrink:0; overflow-y:auto; width:100%; background-color:var(--card-bg-light);
  box-shadow:var(--shadow-sm); padding:0.75rem; border-right-width:0;
  border-color: var(--border-light); /* Ensure sidebar border uses correct theme variable */
}
.dark .dashboard-chat-container > aside#sidebar {
  background-color:var(--card-bg-dark);
  border-color: var(--border-dark);
}
@media (min-width:768px) { .dashboard-chat-container > aside#sidebar { width:19rem; border-right-width:1px; } }


.dashboard-chat-container > main {
  flex-grow:1; display:flex; flex-direction:column; overflow:hidden;
  background-color:var(--color-secondary-100);
}
.dark .dashboard-chat-container > main { background-color:var(--color-secondary-850); }

#chatLogArea {
  flex-grow:1; overflow-y:auto; padding:1rem; background-color:var(--bg-light);
}
.dark #chatLogArea { background-color:var(--bg-dark); }

#promptInputForm {
  flex-shrink:0; padding:0.75rem 1rem; border-top-width:1px;
  background-color:var(--card-bg-light); box-shadow:0 -1px 3px rgba(0,0,0,.03);
  border-color: var(--border-light);
}
.dark #promptInputForm {
  background-color:var(--card-bg-dark); box-shadow:0 -1px 3px rgba(0,0,0,.1);
  border-color: var(--border-dark);
}

#userPrompt { min-height:48px;max-height:200px;overflow-y:auto;line-height:1.5;border-radius:var(--border-radius-xl);padding:0.75rem 1rem;font-size:0.875rem; }

.chat-message { padding:0.75rem 1rem;margin-bottom:0.75rem;border-radius:var(--border-radius-xl);max-width:85%;word-wrap:break-word;box-shadow:var(--shadow-sm);line-height:1.5;font-size:0.9rem; }
.chat-message.user-message { background-color:var(--primary-light);color:white;margin-left:auto; }
.dark .chat-message.user-message { background-color:var(--primary-dark);color:var(--color-secondary-900); }
.chat-message.ai-message { background-color:var(--card-bg-light);color:var(--text-light);margin-right:auto; border: 1px solid var(--border-light); }
.dark .chat-message.ai-message { background-color:var(--card-bg-dark);color:var(--text-dark); border-color: var(--border-dark); }
.chat-message-system { font-style:italic;font-size:0.8rem;color:var(--text-muted-light);text-align:center;padding:0.75rem;margin-bottom:0.5rem;border-radius:var(--border-radius); }
.dark .chat-message-system { color:var(--text-muted-dark); }

/* File Block and Code Styling - Reverted to your custom background */
.file-block {
  background-color:var(--color-secondary-100); /* Your custom light mode file block background */
  border-width:1px; border-color: var(--border-light);
  border-radius:var(--border-radius);padding:0.75rem;margin:0.75rem 0;
}
.dark .file-block {
  background-color:var(--color-secondary-700); /* Your custom dark mode file block background */
  border-color: var(--border-dark);
}
.file-block h4 { font-size:0.8rem;margin-bottom:0.375rem;color:var(--text-light);font-weight:600; }
.dark .file-block h4 { color:var(--text-dark); }

/* PRE for code blocks within .file-block - Reverted to your specific custom backgrounds */
.file-block pre {
  background-color:#2d3c56 !important; /* Your custom light mode <pre> background */
  color: var(--code-text) !important; /* Assuming --code-text is light for this dark bg */
  border: 1px solid #444444 !important; /* Your custom border */
  padding:0.75rem !important; margin:0 !important; font-size:0.8rem !important;
  max-height:25rem; overflow: auto;
  border-radius:var(--border-radius);
  position:relative;
  font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
}
.dark .file-block pre {
  background-color:#0f172a !important; /* Your custom dark mode <pre> background */
  color: var(--code-text) !important; /* Assuming --code-text is light for this very dark bg */
  border-color: #334155 !important; /* A border that fits the dark theme */
}

/* Ensure Prism line numbers adapt to these custom backgrounds */
.file-block pre .line-numbers-rows {
  background-color: inherit !important; /* Inherit from parent <pre> */
  border-right-color: #555 !important; /* A visible line number border */
}
.file-block pre .line-numbers-rows > span::before {
  color: #888 !important; /* Line numbers color that's visible on your custom bg */
}


.copy-code-btn {
  position:absolute;top:0.5rem;right:0.5rem;font-size:0.7rem;background-color:var(--color-secondary-600);
  color:white;padding:0.25rem 0.5rem;border-radius:var(--border-radius);opacity:0.65;transition:var(--transition-fast);
  display:flex;align-items:center;gap:0.25rem;z-index:10;
}
.copy-code-btn:hover { opacity:1;background-color:var(--color-secondary-700); }
/* Copy button color should be fine on your custom dark pre backgrounds */


#sessionsList li {
  cursor:pointer;transition:background-color var(--transition-fast),border-color var(--transition-fast);
  padding:0.5rem 0.75rem;border-radius:var(--border-radius);border-width:1px;border-color:transparent;
}
#sessionsList li:hover { background-color:var(--color-secondary-100);border-color:var(--color-secondary-200); }
.dark #sessionsList li:hover { background-color:var(--color-secondary-700);border-color:var(--color-secondary-600); }
#sessionsList li.active-session {
  background-color:var(--primary-light) !important;color:white !important;
  border-color:var(--primary-hover-light) !important;font-weight:500;
}
.dark #sessionsList li.active-session {
  background-color:var(--primary-dark) !important;color:var(--color-secondary-900) !important;
  border-color:var(--primary-hover-dark) !important;
}

#fileContextContainer .file-context-group { font-size:0.75rem;padding:0.5rem;border-width:1px;background-color:var(--card-bg-light); }
.dark #fileContextContainer .file-context-group { background-color:var(--card-bg-dark); }
#fileContextContainer .file-context-group input, #fileContextContainer .file-context-group textarea { font-size:0.75rem;padding:0.375rem 0.5rem;margin:0.125rem 0; }
#fileContextContainer .file-context-group .remove-file-btn { font-size:0.7rem;padding:0.125rem 0.25rem;color:var(--color-danger-500); }
.dark #fileContextContainer .file-context-group .remove-file-btn { color:var(--color-danger-500); }
.dark #fileContextContainer .file-context-group .remove-file-btn:hover { color:var(--color-danger-600); }

/* Modal Styling */
#fileContentModal {
  position: fixed; inset: 0; z-index: 100;
  background-color: rgba(var(--color-secondary-900-rgb), 0.8);
  padding: 1rem; display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 0.3s ease-in-out;
}
#fileContentModal.is-open { opacity: 1; pointer-events: auto; }
#modalDialog {
  background-color: var(--card-bg-light); color: var(--text-light);
  border-radius: var(--border-radius-lg); box-shadow: var(--shadow-xl);
  width: 100%; max-width: 56rem; max-height: 90vh; display: flex; flex-direction: column; overflow: hidden;
  transform: scale(0.95) translateY(10px); opacity: 0;
  transition: transform 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28), opacity 0.25s ease-in-out;
}
.dark #modalDialog { background-color: var(--card-bg-dark); color: var(--text-dark); }
#fileContentModal.is-open #modalDialog { transform: scale(1) translateY(0); opacity: 1; }
#modalFileContentWrapper { /* This is a <pre> tag inside the modal */
  font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
  background-color: var(--code-bg) !important; /* Use general dark code bg for modal too */
  color: var(--code-text) !important;
  border: 1px solid var(--code-border) !important;
  border-radius: var(--border-radius);
  /* padding, margin, font-size, max-height, overflow are inherited or set by Prism on the code element */
}
#modalFileContentWrapper code { background: none !important; }


/* General PrismJS Line numbers theming (for code blocks NOT in .file-block, if any) */
pre[class*="language-"].line-numbers { padding-left:3.8em;position:relative;counter-reset:linenumber; }
pre[class*="language-"] .line-numbers-rows { /* General case */
  border-right-color:var(--code-border) !important; background-color:var(--code-bg) !important;
  position:absolute;pointer-events:none;top:0;font-size:100%;left:-3.8em;width:3em;letter-spacing:-1px;border-right-width:1px;user-select:none;
}
pre[class*="language-"] .line-numbers-rows > span::before {
  color:var(--text-muted-dark) !important; /* Using a muted color that works on dark bg */
  display:block;padding-right:0.8em;text-align:right;
}


/* Mobile Sidebar Overlay */
#sidebarOverlay {
  position:fixed;inset:0;background-color:rgba(var(--color-secondary-900-rgb), 0.6);backdrop-filter:blur(4px);
  opacity:0;pointer-events:none;transition:opacity 0.3s ease-in-out;z-index:57;
}

/* Global Mobile Nav Panel Styles */
#mobileNavPanel { padding-top: calc(var(--header-height) + 1rem); box-shadow: var(--shadow-lg); }
#mobileNavPanel #closeMobileNavPanel { position: absolute; top: 0.5rem; right: 0.5rem; color: var(--text-muted-light); padding: 0.5rem; }
.dark #mobileNavPanel #closeMobileNavPanel { color: var(--text-muted-dark); }
#mobileNavLinksContainer a { display: block; padding: 0.75rem 1rem; font-size: 1.125rem; font-weight: 500; color: var(--text-light); border-bottom: 1px solid var(--border-light); transition: background-color var(--transition-fast); }
.dark #mobileNavLinksContainer a { color: var(--text-dark); border-bottom-color: var(--border-dark); }
#mobileNavLinksContainer a:hover { background-color: var(--color-secondary-100); }
.dark #mobileNavLinksContainer a:hover { background-color: var(--color-secondary-700); }
#mobileNavLinksContainer a:last-child { border-bottom: none; }

/* Navigation Link class for Header */
a.nav-link {
  padding: 0.5rem 0.875rem; border-radius: var(--border-radius);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  font-size: 0.9rem; font-weight: 500; color: var(--text-muted-light); line-height: 1.5;
}
a.nav-link:hover, a.nav-link.active { color: var(--primary-light); background-color: var(--color-primary-50); text-decoration: none; }
.dark a.nav-link { color: var(--text-muted-dark); }
.dark a.nav-link:hover, .dark a.nav-link.active { color: var(--primary-dark); background-color: var(--color-secondary-700); }

/* Styling for Markdown Generated HTML in AI responses (plain text focus) */
/* These styles are for the <p> tag that will hold the explanation text */
.ai-message > p.text-sm.mb-3.whitespace-pre-wrap { /* Target the explanation paragraph directly */
    line-height: 1.7;
    font-size: 0.9rem; /* Slightly larger for readability */
}
/* If you decide to add simple Markdown support later (bold/italic via JS replacing *...*), you might add: */
/* .ai-message strong { font-weight: 600; } */
/* .ai-message em { font-style: italic; } */


/* Custom Scrollbar */
.custom-scroll::-webkit-scrollbar { width: 8px; height: 8px; }
.custom-scroll::-webkit-scrollbar-track { background: var(--color-secondary-100); border-radius: 4px; }
.dark .custom-scroll::-webkit-scrollbar-track { background: var(--color-secondary-700); }
.custom-scroll::-webkit-scrollbar-thumb { background: var(--color-secondary-300); border-radius: 4px; border: 2px solid var(--color-secondary-100); }
.dark .custom-scroll::-webkit-scrollbar-thumb { background: var(--color-secondary-500); border-color: var(--color-secondary-700); }
.custom-scroll::-webkit-scrollbar-thumb:hover { background: var(--color-secondary-400); }
.dark .custom-scroll::-webkit-scrollbar-thumb:hover { background: var(--color-secondary-600); }
.custom-scroll { scrollbar-width: thin; scrollbar-color: var(--color-secondary-300) var(--color-secondary-100); }
.dark .custom-scroll { scrollbar-color: var(--color-secondary-500) var(--color-secondary-700); }

/* Auth Page Specific Centering and Sizing */
.auth-page-container {
    display: flex;
    flex-direction: column; /* Ensure footer can be pushed down if content is short */
    align-items: center;
    justify-content: center; /* Vertically center the card */
    flex-grow: 1; /* Take up remaining vertical space */
    padding: 2rem 1rem; /* py-8 px-4 */
    width: 100%;
}
.auth-card { /* Applied to the card on login/register pages */
    width: 100%;
    max-width: 32rem; /* max-w-lg, was max-w-md (28rem) */
    /* space-y-8 class is from Tailwind, meaning margin-top on child elements */
}
@media (min-width: 640px) { /* sm */
    .auth-card {
        max-width: 32rem; /* Keep it max-w-lg for sm and up */
    }