/* Modern ZLLM Chat Interface - Inspired by OpenAI/Anthropic */

/* CSS Custom Properties (Variables) */
:root {
  /* Colors - Modern Dark Theme */
  --color-bg-primary: #0d0d0d;
  --color-bg-secondary: #171717;
  --color-bg-tertiary: #1f1f1f;
  --color-bg-quaternary: #262626;
  
  --color-border-primary: #262626;
  --color-border-secondary: #404040;
  --color-border-active: #525252;
  
  --color-text-primary: #f5f5f5;
  --color-text-secondary: #d4d4d4;
  --color-text-tertiary: #a3a3a3;
  --color-text-muted: #737373;
  
  --color-accent-primary: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-accent-light: #3b82f6;
  
  --color-success: #16a34a;
  --color-success-hover: #15803d;
  
  --color-danger: #dc2626;
  --color-warning: #f59e0b;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 3rem;
  
  /* Typography */
  --font-family-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --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);
  
  /* Animations */
  --duration-150: 150ms;
  --duration-200: 200ms;
  --duration-300: 300ms;
  
  /* Layout */
  --sidebar-width: 16rem;
  --sidebar-width-collapsed: 0rem;
  --header-height: 3.5rem;
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: 1.5;
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Prevent zoom on iOS when input is focused */
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* Main App Container */
.app-container {
  display: flex;
  height: 100vh;
  height: 100dvh; /* Dynamic viewport height for mobile browsers */
  width: 100vw;
  position: relative;
  overflow: hidden;
}

/* Sidebar Styles */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border-primary);
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 20;
  transition: width var(--duration-300) ease-in-out;
}

.sidebar.collapsed {
  width: var(--sidebar-width-collapsed);
  overflow: hidden;
}

.sidebar.collapsed .brand-subtitle {
  opacity: 0;
  transform: translateX(-10px);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border-primary);
  min-height: var(--header-height);
}

.sidebar-brand h1 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0;
}

.brand-subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all var(--duration-300) ease-in-out;
  white-space: nowrap;
}

.sidebar-toggle {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-200) ease-in-out;
}

.sidebar-toggle:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-quaternary);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.nav-button {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  background: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--duration-200) ease-in-out;
  white-space: nowrap;
}

.nav-button:hover {
  background-color: var(--color-bg-quaternary);
  color: var(--color-text-primary);
}

.nav-button.primary {
  background-color: var(--color-accent-primary);
  color: white;
}

.nav-button.primary:hover {
  background-color: var(--color-accent-hover);
}

.nav-button svg {
  flex-shrink: 0;
}

/* Uncollapse Button */
.uncollapse-button {
  position: fixed;
  top: calc(var(--header-height) + var(--space-md));
  left: var(--space-lg);
  z-index: 25;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  color: var(--color-text-tertiary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateX(-100%);
  transition: all var(--duration-300) ease-in-out;
  box-shadow: var(--shadow-md);
  pointer-events: none;
}

.uncollapse-button:hover {
  background-color: var(--color-bg-quaternary);
  color: var(--color-text-primary);
  border-color: var(--color-border-secondary);
}

.uncollapse-button.visible {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.uncollapse-button svg {
  transform: rotate(180deg);
}

/* Sidebar Overlay for Mobile */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 10;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-300) ease-in-out;
}

.sidebar-overlay.visible {
  opacity: 1;
  visibility: visible;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* Chat Container */
.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.chat-header {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: 0 var(--space-xl);
  min-height: var(--header-height);
  border-bottom: 1px solid var(--color-border-primary);
  background-color: var(--color-bg-secondary);
  justify-content: flex-start;
}

.mobile-sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all var(--duration-200) ease-in-out;
  align-items: center;
  justify-content: center;
}

.mobile-sidebar-toggle:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-quaternary);
}

.chat-header h2 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1;
}

/* Messages Container */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-xl);
  scroll-behavior: smooth;
}

.messages-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  max-width: 48rem;
  margin: 0 auto;
}

/* Message Styles */
.message {
  display: flex;
  gap: var(--space-md);
  animation: messageSlideIn var(--duration-300) ease-out;
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.user {
  flex-direction: row-reverse;
}

.message-avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  flex-shrink: 0;
}

.message.user .message-avatar {
  background-color: var(--color-accent-primary);
  color: white;
}

.message.assistant .message-avatar {
  background-color: var(--color-bg-quaternary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-primary);
}

.message-content {
  flex: 1;
  min-width: 0;
}

.message.user .message-content {
  text-align: right;
}

.message-bubble {
  display: inline-block;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  line-height: 1.5;
  max-width: 100%;
  word-wrap: break-word;
}

.message.user .message-bubble {
  background-color: var(--color-accent-primary);
  color: white;
  border-bottom-right-radius: var(--radius-sm);
}

.message.assistant .message-bubble {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-primary);
  border-bottom-left-radius: var(--radius-sm);
}

/* Input Container */
.input-container {
  padding: var(--space-xl);
  border-top: 1px solid var(--color-border-primary);
  background-color: var(--color-bg-secondary);
  /* Ensure input stays above mobile keyboard */
  position: relative;
  z-index: 1;
}

.input-wrapper {
  max-width: 48rem;
  margin: 0 auto;
  position: relative;
  display: flex;
  align-items: flex-end;
  gap: var(--space-md);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  transition: border-color var(--duration-200) ease-in-out;
}

.input-wrapper:focus-within {
  border-color: var(--color-border-active);
}

#message-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  line-height: 1.5;
  resize: none;
  outline: none;
  min-height: 1.5rem;
  max-height: 8rem;
  overflow-y: auto;
  font-family: inherit;
  vertical-align: baseline;
  margin: 0;
  padding: 0;
}

#message-input::placeholder {
  color: var(--color-text-muted);
}

.send-button {
  background-color: var(--color-accent-primary);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--duration-200) ease-in-out;
  flex-shrink: 0;
}

.send-button:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
}

.send-button:disabled {
  background-color: var(--color-bg-quaternary);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.send-button.loading {
  background-color: var(--color-accent-primary);
  color: white;
}

.send-button svg {
  transition: transform var(--duration-200) ease-in-out;
}

.send-button:hover:not(:disabled) svg {
  transform: translateX(1px);
}

/* Loading Spinner */
.spinner {
  width: 1rem;
  height: 1rem;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Instructions Panel */
.instructions-panel {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-bg-primary);
  z-index: 30;
  transform: translateX(100%);
  transition: transform var(--duration-300) ease-in-out;
  overflow-y: auto;
}

.instructions-panel.visible {
  transform: translateX(0);
}

.instructions-content {
  max-width: 48rem;
  margin: 0 auto;
  padding: var(--space-xl);
}

.instructions-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border-primary);
  text-align: left;
}

.instructions-header h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0;
  text-align: left;
}

.close-instructions {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  transition: all var(--duration-200) ease-in-out;
}

.close-instructions:hover {
  color: var(--color-text-primary);
  background-color: var(--color-bg-quaternary);
}

.instructions-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.instruction-section h3 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  margin-top: 0;
  text-align: left;
}

.instruction-section p {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
  margin-top: 0;
  text-align: left;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
}

.tip-card {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
}

.tip-icon {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.tip-content strong {
  display: block;
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-xs);
  text-align: left;
}

.tip-content p {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
  margin: 0;
  text-align: left;
}

.capabilities {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.capability {
  padding: var(--space-lg);
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-primary);
  border-top: 2px solid var(--color-accent-primary);
  border-radius: var(--radius-lg);
}

.capability strong {
  display: block;
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-sm);
  text-align: left;
}

.capability p {
  color: var(--color-text-tertiary);
  margin: 0;
  text-align: left;
}

.sample-questions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.sample-question {
  text-align: left;
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--duration-200) ease-in-out;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.sample-question::after {
  content: '<';
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  margin-left: var(--space-md);
  transition: all var(--duration-200) ease-in-out;
  transform: rotate(180deg);
  flex-shrink: 0;
}

.sample-question:hover {
  background-color: var(--color-bg-quaternary);
  border-color: var(--color-border-secondary);
  color: var(--color-text-primary);
}

.sample-question:hover::after {
  color: var(--color-accent-primary);
  transform: rotate(180deg) translateX(2px);
}

.privacy-section {
  padding: var(--space-lg);
  background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-quaternary) 100%);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-lg);
  border-top: 2px solid var(--color-warning);
  position: relative;
}

.privacy-section::before {
  content: '🔒';
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: var(--font-size-lg);
  opacity: 0.5;
}

.privacy-section h3 {
  margin-bottom: var(--space-md);
  text-align: left;
}

.privacy-section p {
  margin: 0;
  font-size: var(--font-size-sm);
  text-align: left;
}

/* Markdown Content Styles */
.markdown-content {
  line-height: 1.6;
}

.markdown-content p {
  margin: 0 0 1em;
}

.markdown-content p:last-child {
  margin-bottom: 0;
}

.markdown-content h1, .markdown-content h2, .markdown-content h3,
.markdown-content h4, .markdown-content h5, .markdown-content h6 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.markdown-content h1:first-child,
.markdown-content h2:first-child,
.markdown-content h3:first-child {
  margin-top: 0;
}

.markdown-content h1 { font-size: var(--font-size-xl); }
.markdown-content h2 { font-size: var(--font-size-lg); }
.markdown-content h3 { font-size: var(--font-size-base); }
.markdown-content h4 { font-size: var(--font-size-sm); }

.markdown-content a {
  color: var(--color-accent-light);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.markdown-content a:hover {
  color: var(--color-accent-primary);
}

.markdown-content code {
  background-color: var(--color-bg-quaternary);
  border: 1px solid var(--color-border-primary);
  padding: 0.125em 0.25em;
  border-radius: var(--radius-sm);
  font-family: var(--font-family-mono);
  font-size: 0.875em;
}

.markdown-content pre {
  background-color: var(--color-bg-quaternary);
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  overflow-x: auto;
  margin: 1em 0;
  font-family: var(--font-family-mono);
  font-size: var(--font-size-sm);
}

.markdown-content pre code {
  background-color: transparent;
  border: none;
  padding: 0;
  font-size: inherit;
}

.markdown-content blockquote {
  border-left: 3px solid var(--color-border-secondary);
  margin: 1em 0;
  padding-left: var(--space-lg);
  color: var(--color-text-tertiary);
  font-style: italic;
}

.markdown-content ul, .markdown-content ol {
  margin: 0.5em 0;
  padding-left: 1.5em;
}

.markdown-content li {
  margin-bottom: 0.25em;
}

.markdown-content hr {
  border: none;
  border-top: 1px solid var(--color-border-primary);
  margin: 2em 0;
}

.markdown-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0;
  border: 1px solid var(--color-border-primary);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.markdown-content th,
.markdown-content td {
  padding: var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-border-primary);
}

.markdown-content th {
  background-color: var(--color-bg-quaternary);
  font-weight: var(--font-weight-semibold);
}

.markdown-content tbody tr:last-child td {
  border-bottom: none;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-secondary);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-active);
}

/* Responsive Design */
/* Tablet and Large Mobile (768px and below) */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 18rem;
    --space-xl: 1rem;
    --space-2xl: 1.5rem;
  }

  .sidebar {
    position: fixed;
    left: -100%;
    top: 0;
    bottom: 0;
    z-index: 20;
    transition: left var(--duration-300) ease-in-out;
    width: var(--sidebar-width);
  }

  .sidebar.open {
    left: 0;
  }

  .mobile-sidebar-toggle {
    display: flex;
    min-width: 44px;
    min-height: 44px;
  }

  .messages-container,
  .input-container,
  .instructions-content {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }

  .messages-list {
    max-width: 100%;
  }

  .input-wrapper {
    max-width: 100%;
  }

  .tips-grid {
    grid-template-columns: 1fr;
  }

  .capabilities {
    gap: var(--space-md);
  }

  .chat-header {
    padding: 0 var(--space-lg);
  }

  .chat-header h2 {
    font-size: var(--font-size-base);
  }

  .instructions-header h2 {
    font-size: var(--font-size-xl);
  }
}

/* Small Mobile (640px and below) */
@media (max-width: 640px) {
  :root {
    --sidebar-width: 16rem;
    --space-xl: 0.75rem;
    --space-2xl: 1rem;
    --header-height: 3rem;
  }

  .messages-container,
  .input-container,
  .instructions-content {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .message {
    gap: var(--space-sm);
  }

  .message-avatar {
    width: 1.5rem;
    height: 1.5rem;
    font-size: var(--font-size-xs);
  }

  .message-bubble {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
  }

  .input-wrapper {
    padding: var(--space-sm);
    gap: var(--space-sm);
  }

  #message-input {
    font-size: var(--font-size-sm);
    /* Prevent zoom on iOS when input is focused */
    font-size: 16px;
  }

  .send-button {
    padding: var(--space-xs);
    min-width: 40px;
    min-height: 40px;
  }

  .send-button svg {
    width: 14px;
    height: 14px;
  }

  .chat-header {
    padding: 0 var(--space-md);
    min-height: var(--header-height);
  }

  .chat-header h2 {
    font-size: var(--font-size-sm);
  }

  .sidebar-header {
    padding: var(--space-md);
  }

  .sidebar-nav {
    padding: var(--space-md);
  }

  .nav-button {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-xs);
    min-height: 44px; /* Minimum touch target size */
  }

  .tip-card {
    padding: var(--space-md);
    gap: var(--space-sm);
  }

  .capability {
    padding: var(--space-md);
  }

  .sample-question {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-xs);
  }

  .instructions-header h2 {
    font-size: var(--font-size-lg);
  }

  .instruction-section h3 {
    font-size: var(--font-size-base);
  }
}

/* Extra Small Mobile (480px and below) */
@media (max-width: 480px) {
  :root {
    --sidebar-width: 14rem;
    --space-xl: 0.5rem;
    --space-lg: 0.75rem;
    --space-md: 0.5rem;
    --header-height: 2.75rem;
  }

  .messages-container,
  .input-container,
  .instructions-content {
    padding: var(--space-sm);
  }

  .chat-header {
    padding: 0 var(--space-sm);
  }

  .sidebar-header {
    padding: var(--space-sm);
  }

  .sidebar-toggle {
    min-width: 36px;
    min-height: 36px;
  }

  .sidebar-nav {
    padding: var(--space-sm);
    gap: var(--space-xs);
  }

  .nav-button {
    padding: var(--space-xs) var(--space-sm);
    min-height: 40px;
  }

  .nav-button span {
    font-size: var(--font-size-xs);
  }

  .message-bubble {
    padding: var(--space-xs) var(--space-sm);
  }

  .input-wrapper {
    border-radius: var(--radius-md);
  }

  #message-input {
    /* Prevent zoom on iOS when input is focused */
    font-size: 16px;
  }

  .send-button {
    border-radius: var(--radius-sm);
    min-width: 36px;
    min-height: 36px;
  }

  .sidebar-brand h1 {
    font-size: var(--font-size-lg);
  }

  .brand-subtitle {
    font-size: 0.6rem;
  }
}

/* Landscape Mobile Orientation */
@media (max-height: 500px) and (orientation: landscape) {
  .messages-container {
    padding-top: var(--space-md);
    padding-bottom: var(--space-md);
  }

  .input-container {
    padding-top: var(--space-md);
    padding-bottom: var(--space-md);
  }

  .sidebar-nav {
    padding-top: var(--space-sm);
    padding-bottom: var(--space-sm);
  }

  .instructions-content {
    padding-top: var(--space-lg);
    padding-bottom: var(--space-lg);
  }
}

/* Print Styles */
@media print {
  .sidebar,
  .input-container,
  .chat-header {
    display: none;
  }

  .main-content {
    margin: 0;
  }

  .messages-container {
    overflow: visible;
    height: auto;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --color-border-primary: #404040;
    --color-border-secondary: #525252;
    --color-bg-tertiary: #262626;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}