/* ==========================================================================
   TAM Agent Design System
   Shared CSS for Login, Chat, About, and Admin pages
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Primary */
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;

  /* Neutrals */
  --color-bg: #f9fafb;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;
  --color-text: #111827;
  --color-text-secondary: #6b7280;
  --color-text-muted: #9ca3af;

  /* Sidebar (white theme) */
  --color-sidebar-bg: #ffffff;
  --color-sidebar-text: #111827;
  --color-sidebar-hover: #f3f4f6;
  --color-sidebar-active: #e5e7eb;
  --color-sidebar-border: #e5e7eb;

  /* Status */
  --color-success: #16a34a;
  --color-danger: #b91c1c;
  --color-warning: #d97706;

  /* Chat */
  --color-user-msg: #2563eb;
  --color-assistant-msg: #ffffff;

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

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

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;

  /* Layout */
  --sidebar-width: 260px;
  --nav-height: 56px;
  --content-max-width: 800px;
}

/* --------------------------------------------------------------------------
   Dark Mode
   -------------------------------------------------------------------------- */
body.dark-mode {
  --color-bg: #1a1a2e;
  --color-surface: #16213e;
  --color-border: #2a2a4a;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;

  --color-sidebar-bg: #16213e;
  --color-sidebar-text: #e2e8f0;
  --color-sidebar-hover: #1a2744;
  --color-sidebar-active: #1e3a5f;
  --color-sidebar-border: #2a2a4a;

  --color-assistant-msg: #1e293b;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

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

ul,
ol {
  list-style: none;
}

button,
input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}


/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-md);
}

.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }

code, pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

pre {
  background-color: #1f2937;
  color: #f3f4f6;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

/* --------------------------------------------------------------------------
   Layout Utilities
   -------------------------------------------------------------------------- */

/* Full-height page layout with nav + content (for non-chat pages) */
.page-layout {
  display: grid;
  grid-template-rows: var(--nav-height) 1fr;
  height: 100vh;
  overflow: hidden;
}

/* Chat layout: sidebar + main content (old grid for non-chat pages) */
.chat-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  height: 100%;
  overflow: hidden;
}

/* Centered content container */
.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

/* Flexbox utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

/* Grid utilities */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }

/* Overflow */
.overflow-y-auto { overflow-y: auto; }
.overflow-hidden { overflow: hidden; }

/* Spacing helpers */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.px-md { padding-left: var(--space-md); padding-right: var(--space-md); }
.py-sm { padding-top: var(--space-sm); padding-bottom: var(--space-sm); }


/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.5;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-bg);
}

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

.btn-danger:hover:not(:disabled) {
  background-color: #991b1b;
  border-color: #991b1b;
}

.btn-success {
  background-color: var(--color-success);
  color: #ffffff;
  border-color: var(--color-success);
}

.btn-success:hover:not(:disabled) {
  background-color: #15803d;
  border-color: #15803d;
}

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

.btn-lg {
  padding: var(--space-md) var(--space-xl);
  font-size: var(--text-base);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* Google OAuth button */
.btn-google {
  background-color: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
  font-weight: 500;
}

.btn-google:hover:not(:disabled) {
  background-color: var(--color-bg);
  border-color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Forms
   -------------------------------------------------------------------------- */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.form-input {
  display: block;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.form-error {
  font-size: var(--text-sm);
  color: var(--color-danger);
  margin-top: var(--space-xs);
}

.form-divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin: var(--space-lg) 0;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.form-divider::before,
.form-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background-color: var(--color-border);
}


/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.card-header {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.card-body {
  color: var(--color-text);
}

/* Login card - centered on page */
.login-card {
  width: 100%;
  max-width: 400px;
  margin: var(--space-xl) auto;
}

/* --------------------------------------------------------------------------
   Navigation Bar (for non-chat pages)
   -------------------------------------------------------------------------- */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 var(--space-lg);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  z-index: 10;
}

.navbar-brand {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.navbar-brand:hover {
  color: var(--color-text);
  text-decoration: none;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.navbar-link {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background-color 0.15s ease;
}

.navbar-link:hover {
  color: var(--color-text);
  background-color: var(--color-bg);
  text-decoration: none;
}

.navbar-link.active {
  color: var(--color-primary);
  font-weight: 500;
}

.navbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.navbar-user-name {
  font-weight: 500;
  color: var(--color-text);
}


/* --------------------------------------------------------------------------
   Chat Page Layout
   -------------------------------------------------------------------------- */
.chat-page {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  height: 100vh;
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   Sidebar (White, Clean)
   -------------------------------------------------------------------------- */
.sidebar {
  display: flex;
  flex-direction: column;
  height: 100%;
  background-color: var(--color-sidebar-bg);
  color: var(--color-sidebar-text);
  border-right: 1px solid var(--color-sidebar-border);
  overflow: hidden;
}

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

.sidebar-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.btn-new-chat {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: #ffffff;
  background-color: var(--color-success);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn-new-chat:hover {
  background-color: #15803d;
}

.sidebar-search {
  position: relative;
  display: flex;
  align-items: center;
}

.sidebar-search-icon {
  position: absolute;
  left: 10px;
  color: var(--color-text-muted);
  pointer-events: none;
}

.sidebar-search-input {
  width: 100%;
  padding: var(--space-sm) var(--space-sm) var(--space-sm) 32px;
  font-size: var(--text-sm);
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.15s ease;
}

.sidebar-search-input:focus {
  border-color: var(--color-primary);
}

.sidebar-search-input::placeholder {
  color: var(--color-text-muted);
}

.sidebar-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-xs) 0;
}

.sidebar-item {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--color-sidebar-text);
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}

.sidebar-item:hover {
  background-color: var(--color-sidebar-hover);
  text-decoration: none;
}

.sidebar-item.active {
  background-color: var(--color-sidebar-active);
}

.sidebar-item-title {
  font-size: var(--text-sm);
  font-weight: 400;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-text);
}

.sidebar-item-time {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

.sidebar-empty {
  padding: var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-align: center;
}

/* Sidebar footer (user info) */
.sidebar-footer {
  padding: var(--space-md);
  border-top: 1px solid var(--color-sidebar-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.sidebar-user-email {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-signout {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  cursor: pointer;
}

.sidebar-signout:hover {
  color: var(--color-danger);
  text-decoration: underline;
}

/* Sidebar toggle button (mobile) */
.sidebar-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: 20;
}


/* --------------------------------------------------------------------------
   Chat Main Area
   -------------------------------------------------------------------------- */
.chat-main {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  background-color: var(--color-bg);
}

/* Top bar */
.chat-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  min-height: 56px;
}

.chat-topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.chat-topbar-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.chat-topbar-link {
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
}

.chat-topbar-link:hover {
  text-decoration: underline;
}

.chat-topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.theme-toggle:hover {
  background-color: var(--color-bg);
  color: var(--color-text);
}

/* Show moon in light mode, sun in dark mode */
.theme-icon-sun {
  display: none;
}

body.dark-mode .theme-icon-moon {
  display: none;
}

body.dark-mode .theme-icon-sun {
  display: block;
}

/* --------------------------------------------------------------------------
   Phase Indicator Bar
   -------------------------------------------------------------------------- */
.phase-bar {
  display: none;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.phase-bar.visible {
  display: flex;
}

.phase-item {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  transition: color 0.2s ease;
}

.phase-item.active {
  color: var(--color-primary);
  font-weight: 500;
}

.phase-item.completed {
  color: var(--color-success);
}

.phase-diamond {
  font-size: var(--text-sm);
}

.phase-item.active .phase-diamond {
  color: var(--color-primary);
}

.phase-item.completed .phase-diamond {
  color: var(--color-success);
}


/* --------------------------------------------------------------------------
   Chat Messages
   -------------------------------------------------------------------------- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-lg);
  display: flex;
  align-items: flex-start;
}

.chat-messages-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  width: 100%;
}

/* Empty state (centered branding) */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  min-height: 50vh;
}

.empty-state-heading {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.empty-state-description {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  max-width: 500px;
  line-height: 1.6;
}

/* Message bubbles */
.message-bubble {
  margin-bottom: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  line-height: 1.6;
  word-wrap: break-word;
  max-width: 80%;
}

.message-bubble.user {
  background-color: var(--color-user-msg);
  color: #ffffff;
  margin-left: auto;
  border-bottom-right-radius: var(--radius-sm);
}

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

.message-content {
  white-space: pre-wrap;
}

.message-error {
  padding: var(--space-sm) var(--space-md);
  background-color: #fee2e2;
  color: #991b1b;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  margin-bottom: var(--space-md);
}

body.dark-mode .message-error {
  background-color: #3b1111;
  color: #fca5a5;
}

/* Tool/skill usage indicator */
.tool-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
  animation: fadeIn 0.2s ease;
}

.tool-indicator-icon {
  font-size: var(--text-sm);
}

.tool-indicator-text {
  font-style: italic;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* --------------------------------------------------------------------------
   Chat Input Area
   -------------------------------------------------------------------------- */
.chat-input-area {
  padding: var(--space-md) var(--space-lg);
  background-color: var(--color-bg);
}

.chat-input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  max-width: 700px;
  margin: 0 auto;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.chat-input-wrapper:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.chat-attach-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease;
  flex-shrink: 0;
}

.chat-attach-btn:hover {
  color: var(--color-text-secondary);
}

.chat-input {
  flex: 1;
  padding: var(--space-xs) 0;
  font-size: var(--text-base);
  border: none;
  resize: none;
  min-height: 24px;
  max-height: 120px;
  background: transparent;
  color: var(--color-text);
  outline: none;
}

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

.btn-send {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--text-sm);
  font-weight: 500;
  color: #ffffff;
  background-color: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease;
  flex-shrink: 0;
}

.btn-send:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

.btn-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}


/* --------------------------------------------------------------------------
   Tables (User Management)
   -------------------------------------------------------------------------- */
.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

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

.table th {
  font-weight: 600;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  white-space: nowrap;
}

.table tr:last-child td {
  border-bottom: none;
}

.table tr:hover td {
  background-color: var(--color-bg);
}

/* Status badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  border-radius: var(--radius-full);
}

.badge-active {
  background-color: #d1fae5;
  color: #065f46;
}

.badge-disabled {
  background-color: #fee2e2;
  color: #991b1b;
}

.badge-admin {
  background-color: #dbeafe;
  color: #1e40af;
}

.badge-user {
  background-color: #f3f4f6;
  color: #374151;
}

/* --------------------------------------------------------------------------
   Alert / Banner
   -------------------------------------------------------------------------- */
.alert {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  margin-bottom: var(--space-md);
}

.alert-error {
  background-color: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert-warning {
  background-color: #fef3c7;
  color: #92400e;
  border: 1px solid #fde68a;
}

.alert-success {
  background-color: #d1fae5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-info {
  background-color: #dbeafe;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

/* --------------------------------------------------------------------------
   Toast Notifications
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  font-size: var(--text-sm);
  pointer-events: auto;
  animation: toast-in 0.2s ease-out;
  max-width: 360px;
}

.toast-success { border-left: 3px solid var(--color-success); }
.toast-error { border-left: 3px solid var(--color-danger); }
.toast-warning { border-left: 3px solid var(--color-warning); }

.toast-close {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  font-size: var(--text-lg);
  line-height: 1;
}

@keyframes toast-in {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toast-out {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(100%); }
}

.toast.hiding {
  animation: toast-out 0.2s ease-in forwards;
}


/* --------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

.btn:focus-visible,
.form-input:focus-visible,
.navbar-link:focus-visible,
.sidebar-item:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-primary);
  color: #ffffff;
  border-radius: var(--radius-md);
  z-index: 9999;
  font-size: var(--text-sm);
}

.skip-link:focus {
  top: var(--space-md);
}

.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;
}

/* --------------------------------------------------------------------------
   Loading / Spinner
   -------------------------------------------------------------------------- */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

.typing-indicator {
  display: inline-flex;
  gap: 4px;
  padding: var(--space-sm) var(--space-md);
}

.typing-indicator span {
  width: 6px;
  height: 6px;
  background-color: var(--color-text-muted);
  border-radius: 50%;
  animation: typing 1.2s infinite;
}

.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% { opacity: 0.3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-4px); }
}

/* --------------------------------------------------------------------------
   Utility
   -------------------------------------------------------------------------- */
.hidden {
  display: none !important;
}

.visible {
  display: block;
}

/* --------------------------------------------------------------------------
   Responsive: Breakpoint at 768px
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .chat-page {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    z-index: 30;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 25;
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .sidebar-toggle {
    display: flex;
  }

  /* Chat layout: sidebar + main content (non-chat pages) */
  .chat-layout {
    grid-template-columns: 1fr;
  }

  .grid-cols-2 {
    grid-template-columns: 1fr;
  }

  .navbar {
    padding: 0 var(--space-md);
  }

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

  .navbar-user-name {
    display: none;
  }

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

  .chat-input-area {
    padding: var(--space-sm) var(--space-md);
  }

  .message-bubble {
    max-width: 90%;
  }

  .login-card {
    margin: var(--space-md) auto;
    max-width: calc(100% - var(--space-lg));
  }

  .table th,
  .table td {
    padding: var(--space-xs) var(--space-sm);
  }

  .container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

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

  .toast {
    max-width: 100%;
  }

  .chat-topbar-link {
    display: none;
  }

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

  .phase-item {
    font-size: var(--text-xs);
  }
}