/* ==========================================================================
   Command Center - CSS Styles
   Modern, clean styling with dark mode support
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Light Mode */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-secondary: #64748b;
  --color-secondary-hover: #475569;

  --color-success: #22c55e;
  --color-success-light: #dcfce7;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-danger: #ef4444;
  --color-danger-light: #fee2e2;

  --color-bg: #f8fafc;
  --color-bg-card: #ffffff;
  --color-bg-input: #ffffff;
  --color-bg-hover: #f1f5f9;

  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;

  --color-border: #e2e8f0;
  --color-border-focus: #2563eb;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Layout */
  --header-height: 4rem;
  --max-width: 1200px;
  --sidebar-width: 280px;
}

/* Dark Mode Colors */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-primary-light: #1e3a5f;

    --color-success-light: #14532d;
    --color-warning-light: #78350f;
    --color-danger-light: #7f1d1d;

    --color-bg: #0f172a;
    --color-bg-card: #1e293b;
    --color-bg-input: #1e293b;
    --color-bg-hover: #334155;

    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    --color-border: #334155;
    --color-border-focus: #3b82f6;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5), 0 4px 6px -4px rgb(0 0 0 / 0.4);
  }
}

/* --------------------------------------------------------------------------
   Reset & Base Styles
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Screen reader only */
.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;
}

.hidden {
  display: none !important;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-2xl);
}

h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
}

h3 {
  font-size: var(--font-size-lg);
}

p {
  color: var(--color-text-secondary);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

a:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
header {
  background-color: var(--color-bg-card);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
}

header h1 {
  font-size: var(--font-size-xl);
  white-space: nowrap;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

nav {
  display: flex;
  gap: var(--space-sm);
}

nav a {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
}

nav a:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text);
}

nav a.active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Main Content
   -------------------------------------------------------------------------- */
main {
  flex: 1;
  padding: var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.card h3 {
  margin: 0;
}

/* --------------------------------------------------------------------------
   Status Cards (Dashboard)
   -------------------------------------------------------------------------- */
.status-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background-color: var(--color-text-muted);
  flex-shrink: 0;
  transition: background-color var(--transition-fast);
}

.status-dot.connected,
.status-dot.success {
  background-color: var(--color-success);
}

.status-dot.disconnected,
.status-dot.error {
  background-color: var(--color-danger);
}

.status-dot.pending {
  background-color: var(--color-warning);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-md);
  font-weight: 500;
  line-height: var(--line-height-normal);
  color: #ffffff;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
}

.btn:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

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

.btn-secondary {
  background-color: var(--color-secondary);
}

.btn-secondary:hover {
  background-color: var(--color-secondary-hover);
}

.btn-danger {
  background-color: var(--color-danger);
}

.btn-danger:hover {
  background-color: #dc2626;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn-outline:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Quick Actions (Dashboard)
   -------------------------------------------------------------------------- */
.quick-actions {
  margin-bottom: var(--space-2xl);
}

.actions-grid {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   System Info (Dashboard)
   -------------------------------------------------------------------------- */
.system-info {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

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

.info-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.info-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: 500;
}

.info-value {
  font-size: var(--font-size-md);
  color: var(--color-text);
  font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
}

/* --------------------------------------------------------------------------
   Services List (Connect Page)
   -------------------------------------------------------------------------- */
.page-header {
  margin-bottom: var(--space-xl);
}

.page-header p {
  margin-top: var(--space-sm);
}

.services-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.service-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: box-shadow var(--transition-normal);
}

.service-card:hover {
  box-shadow: var(--shadow-md);
}

.service-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  color: var(--color-primary);
}

.service-icon svg {
  width: 100%;
  height: 100%;
}

.service-info {
  flex: 1;
  min-width: 0;
}

.service-info h3 {
  margin-bottom: var(--space-xs);
}

.service-info p {
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-sm);
}

.service-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
}

.service-status .status-text {
  color: var(--color-text-muted);
}

.service-status.connected .status-text {
  color: var(--color-success);
}

.service-actions {
  display: flex;
  gap: var(--space-sm);
  flex-shrink: 0;
}

/* Tier Badges */
.tier-badge {
  display: inline-block;
  padding: 2px 8px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  margin-left: var(--space-xs);
  vertical-align: middle;
}

.tier-badge.premium {
  background-color: var(--color-warning-light);
  color: var(--color-warning);
}

.tier-badge.enterprise {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.service-icon.premium {
  color: var(--color-warning);
}

/* --------------------------------------------------------------------------
   LLM Selection Modal
   -------------------------------------------------------------------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 560px;
  max-height: calc(100vh - 4rem);
  display: flex;
  flex-direction: column;
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

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

.modal-header h3 {
  margin: 0;
  font-size: var(--font-size-lg);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-2xl);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-body {
  padding: var(--space-lg);
  overflow-y: auto;
  flex: 1;
}

.modal-description {
  margin-bottom: var(--space-lg);
  color: var(--color-text-secondary);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

/* LLM Options */
.llm-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.llm-options-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-xl);
  color: var(--color-text-muted);
}

.llm-options-loading .loading-spinner {
  border-color: var(--color-border);
  border-top-color: var(--color-primary);
}

.llm-option-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  background-color: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.llm-option-card:hover {
  border-color: var(--color-primary);
  background-color: var(--color-bg-hover);
}

.llm-option-card.selected {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.llm-option-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

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

.llm-option-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.llm-option-name {
  font-weight: 600;
  color: var(--color-text);
}

.llm-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.llm-badge.recommended {
  background-color: var(--color-success-light);
  color: var(--color-success);
}

.llm-option-provider {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-xs);
}

.llm-option-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: var(--line-height-normal);
}

.llm-capabilities {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.llm-capability {
  display: inline-flex;
  align-items: center;
  padding: 2px 6px;
  font-size: var(--font-size-xs);
  background-color: var(--color-bg-hover);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
}

.llm-option-check {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  color: transparent;
  transition: all var(--transition-fast);
}

.llm-option-card.selected .llm-option-check {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.llm-option-check svg {
  width: 14px;
  height: 14px;
}

.llm-error {
  padding: var(--space-lg);
  text-align: center;
  background-color: var(--color-danger-light);
  border-radius: var(--radius-md);
}

.llm-error p {
  color: var(--color-danger);
  margin: 0;
}

/* --------------------------------------------------------------------------
   AI Model Settings Section
   -------------------------------------------------------------------------- */
.settings-section {
  margin-top: var(--space-2xl);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.settings-header {
  margin-bottom: var(--space-lg);
}

.settings-header h3 {
  margin-bottom: var(--space-xs);
}

.settings-header p {
  font-size: var(--font-size-sm);
  margin: 0;
}

.llm-settings-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.settings-empty {
  padding: var(--space-lg);
  text-align: center;
  background-color: var(--color-bg);
  border-radius: var(--radius-md);
}

.settings-empty p {
  margin: 0;
  color: var(--color-text-muted);
}

.llm-settings-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.llm-settings-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.llm-settings-service {
  font-weight: 600;
  color: var(--color-text);
}

.llm-settings-current {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
}

.llm-settings-label {
  color: var(--color-text-muted);
}

.llm-settings-value {
  color: var(--color-primary);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Chat Interface
   -------------------------------------------------------------------------- */
.chat-container {
  display: flex;
  flex-direction: row;
  gap: var(--space-lg);
  height: calc(100vh - var(--header-height) - 4rem);
  max-height: 800px;
}

/* Sessions Sidebar */
.sessions-sidebar {
  width: 280px;
  flex-shrink: 0;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sessions-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.sessions-header h3 {
  margin: 0;
  font-size: var(--font-size-base);
  font-weight: 600;
}

.sessions-list {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
  overflow-y: auto;
}

.session-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.session-item:hover {
  background-color: var(--color-bg-hover);
}

.session-item.active {
  background-color: var(--color-primary-light);
  border-left: 3px solid var(--color-primary);
}

.session-channel {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.session-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.session-preview {
  font-size: var(--font-size-sm);
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.session-loading,
.session-empty,
.session-error {
  padding: var(--space-lg);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.session-error {
  color: var(--color-danger);
}

/* Session Action Buttons */
.session-actions {
  display: flex;
  gap: 4px;
  opacity: 1;
  flex-shrink: 0;
}

.session-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
}

.session-action-btn:hover {
  background: var(--color-bg-hover);
  color: var(--color-text);
}

.session-action-btn.edit-btn:hover {
  color: var(--color-primary);
}

.session-action-btn.delete-btn:hover {
  color: var(--color-danger);
  background: rgba(239, 68, 68, 0.1);
}

.btn-sm {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
}

/* Chat Main Area */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.chat-header {
  margin-bottom: var(--space-md);
}

.chat-header p {
  margin-top: var(--space-xs);
}

.chat-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.message {
  max-width: 80%;
  animation: fadeIn 0.3s ease;
}

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

.message.user-message {
  align-self: flex-end;
}

.message.ai-message,
.message.system-message {
  align-self: flex-start;
}

.message-content {
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  line-height: var(--line-height-relaxed);
}

.user-message .message-content {
  background-color: var(--color-primary);
  color: #ffffff;
  border-bottom-right-radius: var(--radius-sm);
}

.ai-message .message-content {
  background-color: var(--color-bg-hover);
  color: var(--color-text);
  border-bottom-left-radius: var(--radius-sm);
}

.system-message .message-content {
  background-color: var(--color-primary-light);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  text-align: center;
  max-width: 100%;
}

.message-content p {
  color: inherit;
  margin: 0;
}

.message-content p + p {
  margin-top: var(--space-sm);
}

.message-content code {
  font-family: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, monospace;
  background-color: rgba(0, 0, 0, 0.1);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

.message-content pre {
  background-color: rgba(0, 0, 0, 0.1);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--space-sm) 0;
}

.message-content pre code {
  background: none;
  padding: 0;
}

/* Chat Input */
.chat-input-container {
  margin-top: var(--space-md);
}

.chat-form {
  display: flex;
  gap: var(--space-sm);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-sm);
}

.chat-form textarea {
  flex: 1;
  border: none;
  background: transparent;
  padding: var(--space-sm);
  font-family: inherit;
  font-size: var(--font-size-md);
  color: var(--color-text);
  resize: none;
  min-height: 44px;
  max-height: 200px;
  line-height: var(--line-height-normal);
}

.chat-form textarea:focus {
  outline: none;
}

.chat-form textarea::placeholder {
  color: var(--color-text-muted);
}

.send-btn {
  align-self: flex-end;
  min-width: 80px;
}

.send-loading {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.chat-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
  text-align: right;
}

/* Loading Spinner */
.loading-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: var(--space-md);
  background-color: var(--color-bg-hover);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: var(--radius-sm);
  width: fit-content;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background-color: var(--color-text-muted);
  border-radius: 50%;
  animation: typing 1.4s infinite both;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0%, 60%, 100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-4px);
  }
}

/* --------------------------------------------------------------------------
   Toast Notifications
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.toast.success {
  border-color: var(--color-success);
  background-color: var(--color-success-light);
}

.toast.error {
  border-color: var(--color-danger);
  background-color: var(--color-danger-light);
}

.toast-message {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.toast-close {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0;
  line-height: 1;
}

.toast-close:hover {
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
footer {
  background-color: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-xl);
  text-align: center;
}

footer p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }

  header {
    flex-direction: column;
    height: auto;
    padding: var(--space-md);
    gap: var(--space-md);
  }

  nav {
    width: 100%;
    justify-content: center;
  }

  nav a {
    flex: 1;
    text-align: center;
    padding: var(--space-sm);
    font-size: var(--font-size-sm);
  }

  .status-cards {
    grid-template-columns: 1fr;
  }

  .service-card {
    flex-direction: column;
    text-align: center;
  }

  .service-actions {
    width: 100%;
    justify-content: center;
  }

  .message {
    max-width: 90%;
  }

  .chat-container {
    height: calc(100vh - 10rem);
  }

  .toast {
    left: var(--space-md);
    right: var(--space-md);
    bottom: var(--space-md);
  }

  /* Modal responsive */
  .modal {
    padding: var(--space-md);
  }

  .modal-content {
    max-height: calc(100vh - 2rem);
  }

  .llm-settings-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .llm-settings-card .btn {
    width: 100%;
    margin-top: var(--space-sm);
  }
}

@media (max-width: 768px) {
  .sessions-sidebar {
    display: none;
  }

  .chat-container {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  main {
    padding: var(--space-md);
  }

  .actions-grid {
    flex-direction: column;
  }

  .actions-grid .btn {
    width: 100%;
  }

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

  .chat-form {
    flex-direction: column;
  }

  .send-btn {
    align-self: stretch;
  }

  /* Modal responsive */
  .modal-footer {
    flex-direction: column-reverse;
  }

  .modal-footer .btn {
    width: 100%;
  }

  .llm-option-card {
    flex-wrap: wrap;
  }

  .llm-option-check {
    order: -1;
  }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
  header,
  footer,
  .chat-input-container,
  .quick-actions,
  .service-actions,
  .modal,
  .settings-section {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .card,
  .service-card,
  .chat-messages {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* --------------------------------------------------------------------------
   Focus Styles for Accessibility
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Remove outline for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* Modal focus trap indicator */
.modal-content:focus {
  outline: none;
}

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

  .modal-content {
    animation: none;
  }
}