/* ========================================
   yoimaGPT Design System
   Modern Minimal with Subtle Animations
   ======================================== */

/* ----------------------------------------
   CSS Custom Properties (Theme System)
   ---------------------------------------- */
:root {
  /* Primary Colors */
  --color-primary-50: #eef2ff;
  --color-primary-100: #e0e7ff;
  --color-primary-200: #c7d2fe;
  --color-primary-300: #a5b4fc;
  --color-primary-400: #818cf8;
  --color-primary-500: #6366f1;
  --color-primary-600: #4f46e5;
  --color-primary-700: #4338ca;
  
  /* Accent Colors */
  --color-accent-blue: #2563eb;
  --color-accent-purple: #7c3aed;
  --color-accent-pink: #ec4899;
  --color-accent-cyan: #06b6d4;
  --color-accent-emerald: #10b981;
  
  /* Neutral Colors */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Semantic Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --bg-elevated: #ffffff;
  
  /* Text Colors */
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-tertiary: #6b7280;
  --text-muted: #9ca3af;
  --text-inverse: #ffffff;
  
  /* Border Colors */
  --border-light: #e5e7eb;
  --border-default: #d1d5db;
  --border-focus: #a5b4fc;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --gradient-primary-hover: linear-gradient(135deg, #1d4ed8 0%, #6d28d9 100%);
  --gradient-subtle: linear-gradient(135deg, #eef2ff 0%, #fae8ff 100%);
  --gradient-mesh: radial-gradient(at 40% 20%, hsla(240, 100%, 94%, 1) 0px, transparent 50%),
                   radial-gradient(at 80% 0%, hsla(281, 100%, 94%, 1) 0px, transparent 50%),
                   radial-gradient(at 0% 50%, hsla(210, 100%, 94%, 1) 0px, transparent 50%),
                   radial-gradient(at 80% 50%, hsla(300, 100%, 94%, 1) 0px, transparent 50%);
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.15);
  --shadow-glow-lg: 0 0 40px rgba(99, 102, 241, 0.2);
  --shadow-colored: 0 10px 30px -10px rgba(79, 70, 229, 0.3);
  
  /* Animation */
  --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
  
  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;
}

/* Dark Mode */
[data-theme="dark"] {
  --bg-primary: #111827;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1f2937;
  --bg-elevated: #1f2937;
  --text-primary: #f9fafb;
  --text-secondary: #e5e7eb;
  --text-tertiary: #9ca3af;
  --text-muted: #6b7280;
  --border-light: #374151;
  --border-default: #4b5563;
  --gradient-subtle: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  --shadow-glow: 0 0 20px rgba(129, 140, 248, 0.15);
  
  /* Dark mode specific colors */
  --color-primary-50: rgba(99, 102, 241, 0.1);
  --color-primary-100: rgba(99, 102, 241, 0.15);
  --color-primary-200: rgba(99, 102, 241, 0.25);
}

/* ----------------------------------------
   Base Styles
   ---------------------------------------- */
html, body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: background-color var(--duration-slow) var(--ease-out), color var(--duration-slow) var(--ease-out);
}

#app .chat-sidebar {
  overflow-x: hidden;
  padding: 1.25rem 1.5rem;
  --sidebar-item-height: 36px;
}

#app .chat-sidebar.sidebar-compact {
  width: 260px;
}

#app .chat-sidebar-scroll {
  overflow-x: hidden;
}

#app .chat-sidebar .conversation-item {
  max-width: 100%;
  min-height: var(--sidebar-item-height);
  padding: 0.5rem 0.1rem;
  font-size: 0.85rem;
}

#app .chat-sidebar [data-conversation-title] {
  min-width: 0;
}

#app .chat-sidebar .btn-primary,
#app .chat-sidebar .btn-dark {
  min-height: var(--sidebar-item-height);
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
}

#app .chat-sidebar .plan-card {
  padding: 0.9rem;
}

#app .chat-sidebar .plan-card .mt-4 {
  margin-top: 0.5rem;
}

#app .chat-sidebar .plan-card .mt-3 {
  margin-top: 0.5rem;
}

#app .chat-sidebar .sidebar-item {
  min-height: var(--sidebar-item-height);
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
}

#app .chat-sidebar .sidebar-profile {
  min-height: var(--sidebar-item-height);
  padding: 0.4rem 0.6rem;
}

#app .chat-sidebar .sidebar-profile-wrap {
  position: relative;
}

#app .chat-sidebar .profile-menu {
  position: absolute;
  left: 0;
  bottom: calc(100% + 10px);
  width: 100%;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: 1.25rem;
  box-shadow: var(--shadow-xl);
  padding: 0.75rem;
  z-index: 30;
}

#app .chat-sidebar .profile-menu-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.25rem 0.25rem 0.5rem;
}

#app .chat-sidebar .profile-menu-avatar {
  width: 36px;
  height: 36px;
  border-radius: 9999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.85rem;
}

#app .chat-sidebar .profile-menu-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#app .chat-sidebar .profile-menu-handle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

#app .chat-sidebar .profile-menu-divider {
  height: 1px;
  background: var(--border-light);
  margin: 0.5rem 0;
}

#app .chat-sidebar .profile-menu-item {
  width: 100%;
  min-height: var(--sidebar-item-height);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0.5rem;
  border-radius: 0.9rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
  transition: all var(--duration-fast) var(--ease-out);
}

#app .chat-sidebar .profile-menu-item [data-icon] svg {
  color: var(--text-muted);
}

#app .chat-sidebar .profile-menu-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

#app .chat-sidebar .profile-menu-link {
  justify-content: space-between;
}

#app .chat-sidebar .profile-menu-arrow {
  margin-left: auto;
  color: var(--text-muted);
}

#app .chat-sidebar .profile-menu-danger {
  color: var(--color-error);
}

#app {
  min-height: 100%;
}

button, input, textarea {
  font-family: inherit;
}

[data-hidden="true"] {
  display: none;
}

/* ----------------------------------------
   Animation Keyframes
   ---------------------------------------- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInScale {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-16px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes pulse-soft {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes bounce-gentle {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

@keyframes glow-pulse {
  0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.2); }
  50% { box-shadow: 0 0 35px rgba(99, 102, 241, 0.4); }
}

@keyframes tool-chip-pulse {
  0% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.25); }
  70% { box-shadow: 0 0 0 6px rgba(59, 130, 246, 0); }
  100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
}

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

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

@keyframes sparkle {
  0%, 100% { opacity: 0; transform: scale(0) rotate(0deg); }
  50% { opacity: 1; transform: scale(1) rotate(180deg); }
}

/* ----------------------------------------
   Utility Animation Classes
   ---------------------------------------- */
.animate-fade-in { animation: fadeIn var(--duration-normal) var(--ease-out); }
.animate-fade-in-up { animation: fadeInUp var(--duration-normal) var(--ease-out); }
.animate-fade-in-scale { animation: fadeInScale var(--duration-normal) var(--ease-spring); }
.animate-slide-in-right { animation: slideInRight var(--duration-normal) var(--ease-out); }
.animate-slide-in-left { animation: slideInLeft var(--duration-normal) var(--ease-out); }
.animate-float { animation: float 3s ease-in-out infinite; }
.animate-pulse-soft { animation: pulse-soft 2s ease-in-out infinite; }
.animate-glow { animation: glow-pulse 2s ease-in-out infinite; }

.animate-shimmer {
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

/* ----------------------------------------
   Interactive States
   ---------------------------------------- */
.hover-lift {
  transition: transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out);
}
.hover-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.hover-scale {
  transition: transform var(--duration-fast) var(--ease-spring);
}
.hover-scale:hover {
  transform: scale(1.02);
}

.hover-glow {
  transition: box-shadow var(--duration-normal) var(--ease-out);
}
.hover-glow:hover {
  box-shadow: var(--shadow-glow);
}

.active-scale:active {
  transform: scale(0.98);
}

/* ----------------------------------------
   Non-selectable UI Text
   ---------------------------------------- */
.chat-sidebar,
[data-model-toggle],
.upgrade-tab,
[data-message][data-role="assistant"] .gradient-text {
  -webkit-user-select: none;
  user-select: none;
}

[data-message-input]::placeholder {
  -webkit-user-select: none;
  user-select: none;
}

.sidebar-profile .w-9.h-9,
.profile-menu-avatar {
  -webkit-user-select: none;
  user-select: none;
}

[data-message][data-role="user"] .w-9.h-9 {
  -webkit-user-select: none;
  user-select: none;
}

/* ----------------------------------------
   Floating Input Area
   ---------------------------------------- */
[data-chat-main]:not(.chat-empty) [data-input-area] {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 5;
  background: transparent;
  padding: 0 6.5rem 1.5rem;
  pointer-events: none;
}
[data-chat-main]:not(.chat-empty) [data-input-area] > * {
  pointer-events: auto;
}
[data-chat-main]:not(.chat-empty) [data-messages-scroll] {
  padding-bottom: 9rem;
}

/* ----------------------------------------
   Glass Effect
   ---------------------------------------- */
.glass {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

[data-theme="dark"] .glass {
  background: rgba(30, 41, 59, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

/* ----------------------------------------
   Gradient Text
   ---------------------------------------- */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-animated {
  background: linear-gradient(135deg, #2563eb, #7c3aed, #ec4899, #2563eb);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 8s ease infinite;
}

/* ----------------------------------------
   Button Styles
   ---------------------------------------- */
.btn-primary {
  background: var(--gradient-primary);
  color: white;
  border: none;
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  box-shadow: var(--shadow-colored);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary-hover);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-colored), var(--shadow-glow);
}
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-primary span { position: relative; z-index: 1; }

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}
.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--border-default);
  transform: translateY(-1px);
}
.btn-danger {
  background: var(--color-error);
  color: white;
  border: none;
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  box-shadow: var(--shadow-sm);
}
.btn-danger:hover {
  filter: brightness(0.95);
  transform: translateY(-1px);
}
.btn-danger:active {
  transform: translateY(0);
}

.btn-dark {
  background: var(--color-gray-900);
  color: white;
  border: none;
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}
.btn-dark:hover {
  background: var(--color-gray-800);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}
.btn-dark:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* ----------------------------------------
   Card Styles
   ---------------------------------------- */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  padding: 1.5rem;
  transition: all var(--duration-normal) var(--ease-out);
}

.card-elevated {
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
  transition: all var(--duration-normal) var(--ease-out);
}
.card-elevated:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-2px);
}

.card-gradient {
  background: var(--gradient-subtle);
  border: 1px solid rgba(99, 102, 241, 0.1);
  border-radius: var(--radius-2xl);
  padding: 1.5rem;
}

/* ----------------------------------------
   Input Styles
   ---------------------------------------- */
.input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  font-size: 0.875rem;
  color: var(--text-primary);
  transition: all var(--duration-fast) var(--ease-out);
}
.input::placeholder { color: var(--text-muted); }
.input:focus {
  outline: none;
  border-color: var(--color-primary-400);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
  background: var(--bg-primary);
}

/* ----------------------------------------
   Model Toggle
   ---------------------------------------- */
[data-model-option] {
  color: var(--text-tertiary);
  transition: all var(--duration-fast) var(--ease-out);
}
[data-model-option]:hover { color: var(--text-primary); }
[data-model-option][data-active="true"] {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-colored);
}
[data-model-option][disabled] { opacity: 0.4; cursor: not-allowed; }
.model-option-tooltip {
  display: inline-flex;
  align-items: center;
}

#app .model-toggle-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  background: var(--bg-secondary);
  backdrop-filter: blur(10px);
}

#app .model-toggle-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 1rem;
  width: 100%;
}

#app .model-toggle-slot {
  display: flex;
  align-items: center;
  min-width: 0;
}

#app .model-toggle-left {
  justify-content: flex-start;
}

#app .model-toggle-right {
  justify-content: flex-end;
}

#app .model-toggle-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  max-width: 48vw;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  justify-self: center;
}

@media (max-width: 640px) {
  #app .model-toggle-title {
    font-size: 0.8rem;
    max-width: 58vw;
  }
}

#app [data-messages-scroll] {
  padding-top: 6.5rem;
}

/* ----------------------------------------
   Tool Chip
   ---------------------------------------- */
[data-tool-chip][data-status="running"] {
  background: var(--color-primary-50);
  border-color: var(--color-primary-200);
  color: var(--color-primary-600);
  animation: tool-chip-pulse 1.4s ease-out infinite;
}
[data-tool-chip][data-status="done"] {
  background: #ecfdf3;
  border-color: #a7f3d0;
  color: #047857;
}
[data-tool-chip][data-status="failed"] {
  background: #fef2f2;
  border-color: #fecaca;
  color: #b91c1c;
}

/* ----------------------------------------
   Message Input
   ---------------------------------------- */
[data-message-input] {
  max-height: 120px;
  overflow-y: hidden;
  line-height: 1.5;
}
[data-message-input]:focus-visible {
  outline: none;
  box-shadow: none;
}

/* ----------------------------------------
   Auth Card & Background
   ---------------------------------------- */
.auth-card {
  width: 100%;
  max-width: 24rem;
  animation: fadeInScale var(--duration-slow) var(--ease-spring);
}

.auth-background {
  background: var(--gradient-mesh);
  min-height: 100vh;
  position: relative;
}
.auth-background::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, transparent 0%, var(--bg-secondary) 70%);
}

/* ----------------------------------------
   Thinking Bar
   ---------------------------------------- */
.thinking-bar {
  background: var(--gradient-primary);
  transition: width var(--duration-normal) var(--ease-out);
}
.thinking-bar.thinking-bar--warn {
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
}
.thinking-bar.thinking-bar--danger {
  background: linear-gradient(90deg, #ef4444, #f87171);
}

/* ----------------------------------------
   Markdown
   ---------------------------------------- */
.markdown {
  line-height: 1.7;
  color: var(--text-primary);
}
.markdown h1, .markdown h2, .markdown h3, .markdown h4 {
  margin: 1.5rem 0 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
}
.markdown h1 { font-size: 1.5rem; }
.markdown h2 { font-size: 1.25rem; }
.markdown h3 { font-size: 1.125rem; }
.markdown p { margin: 0.75rem 0; }
.markdown ul, .markdown ol { margin: 0.75rem 0 0.75rem 1.5rem; padding: 0; }
.markdown li + li { margin-top: 0.25rem; }
.markdown blockquote {
  margin: 0.75rem 0;
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--color-primary-300);
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}
.markdown a {
  color: var(--color-primary-600);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.markdown a:hover { color: var(--color-primary-700); }
.markdown code {
  background: var(--bg-tertiary);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: var(--color-primary-600);
}
.markdown pre {
  background: var(--color-gray-900);
  color: #f9fafb;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: 1rem 0;
  position: relative;
}
.markdown pre.has-code-copy {
  padding-top: 2.75rem;
}
.markdown pre::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.markdown pre .code-copy-button {
  position: absolute;
  top: 0.55rem;
  right: 0.65rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(15, 23, 42, 0.72);
  color: #f8fafc;
  z-index: 2;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out),
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}
.markdown pre:hover .code-copy-button,
.markdown pre:focus-within .code-copy-button {
  opacity: 1;
  transform: translateY(0);
}
.markdown pre .code-copy-button:hover {
  background: rgba(37, 99, 235, 0.85);
  border-color: rgba(255, 255, 255, 0.4);
}
.markdown pre .code-copy-button.is-copied {
  background: rgba(16, 185, 129, 0.85);
  border-color: rgba(16, 185, 129, 0.9);
  color: #ecfdf5;
}
.markdown pre code {
  background: transparent;
  padding: 0;
  font-size: 0.85em;
  color: inherit;
}
.markdown table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95em;
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.markdown th, .markdown td {
  border: 1px solid var(--border-light);
  padding: 0.6rem 0.75rem;
  text-align: left;
}
.markdown th {
  background: var(--bg-tertiary);
  font-weight: 600;
}

/* ----------------------------------------
   Link Preview
   ---------------------------------------- */
.link-preview-invoker {
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
@supports (interest-delay: 200ms) {
  .link-preview-invoker {
    interest-delay: 180ms 240ms;
  }
}
@supports selector(:interest-source) {
  .link-preview-invoker:interest-source {
    color: var(--color-primary-700);
  }
}

.link-preview-card {
  margin: 0;
  inset: auto;
  padding: 14px;
  width: min(360px, 90vw);
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  border-radius: 18px;
  box-shadow: var(--shadow-xl);
  position: fixed;
}
@supports (position-area: bottom) {
  .link-preview-card {
    position-area: bottom;
  }
}
@supports (position-try-fallbacks: flip-block) {
  .link-preview-card {
    position-try-fallbacks: flip-block, flip-inline;
  }
}
.link-preview-card:popover-open {
  animation: link-preview-in var(--duration-fast) var(--ease-out);
}
@keyframes link-preview-in {
  from {
    opacity: 0;
    transform: translateY(8px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .link-preview-card:popover-open {
    animation: none;
  }
}

@media (hover: none) {
  .markdown pre .code-copy-button {
    opacity: 1;
    transform: translateY(0);
  }
}

.link-preview-media {
  display: none;
  height: 120px;
  border-radius: 12px;
  overflow: hidden;
  background: var(--gradient-subtle);
  margin-bottom: 12px;
}
.link-preview-card[data-has-image="true"] .link-preview-media {
  display: block;
}
.link-preview-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.link-preview-header {
  display: flex;
  align-items: center;
  gap: 10px;
}
.link-preview-favicon {
  display: none;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--bg-tertiary);
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.link-preview-card[data-has-favicon="true"] .link-preview-favicon {
  display: flex;
}
.link-preview-favicon img {
  width: 16px;
  height: 16px;
  display: block;
}
.link-preview-title {
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.3;
}
.link-preview-host {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}
.link-preview-desc {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.5;
}
.link-preview-card[data-state="loading"] .link-preview-title {
  color: var(--text-tertiary);
}
.link-preview-card[data-state="error"] .link-preview-title {
  color: var(--color-warning);
}

/* ----------------------------------------
   Invite Modal
   ---------------------------------------- */
.invite-hero {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2rem 2.5rem;
  background: var(--gradient-primary);
  color: white;
  position: relative;
  overflow: hidden;
}
.invite-hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -10%;
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: float 6s ease-in-out infinite;
}
.invite-hero::after {
  content: '';
  position: absolute;
  bottom: -30%; left: -5%;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
  animation: float 8s ease-in-out infinite reverse;
}

.invite-close {
  opacity: 0.8;
  transition: opacity var(--duration-fast) var(--ease-out);
  position: relative;
  z-index: 1;
}
.invite-close:hover { opacity: 1; }

.invite-eyebrow {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: rgba(255, 255, 255, 0.7);
}

.invite-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-top: 0.5rem;
  position: relative;
  z-index: 1;
}

.invite-subtitle {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  margin-top: 0.5rem;
  position: relative;
  z-index: 1;
}

.invite-body {
  padding: 2rem 2.5rem;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}
@media (min-width: 768px) {
  .invite-body { grid-template-columns: 1.1fr 2fr; }
}

.invite-side {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.invite-stat-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 1.25rem;
  transition: all var(--duration-fast) var(--ease-out);
}
.invite-stat-card:hover {
  border-color: var(--color-primary-200);
  box-shadow: var(--shadow-sm);
}

.invite-stat-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-tertiary);
}

.invite-stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0.5rem;
}

.invite-status-card {
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-200);
  color: var(--color-primary-700);
  border-radius: var(--radius-xl);
  padding: 0.875rem 1.25rem;
  font-size: 0.875rem;
  min-height: 2.5rem;
  display: flex;
  align-items: center;
}
.invite-status-card.is-warning {
  background: #fff7ed;
  border-color: #fed7aa;
  color: #c2410c;
}
.invite-status-card.is-muted {
  background: var(--bg-tertiary);
  border-color: var(--border-light);
  color: var(--text-tertiary);
}

.invite-create-button {
  width: 100%;
  background: var(--color-gray-900);
  color: white;
  border-radius: var(--radius-full);
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--duration-fast) var(--ease-out);
  border: none;
  cursor: pointer;
}
.invite-create-button:hover {
  background: var(--color-gray-800);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.invite-create-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.invite-error {
  font-size: 0.75rem;
  color: var(--color-error);
}

.invite-list-panel {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  padding: 1.25rem;
}

.invite-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 1rem 1.25rem;
  transition: all var(--duration-fast) var(--ease-out);
  animation: fadeInUp var(--duration-normal) var(--ease-out);
}
.invite-item:hover {
  border-color: var(--color-primary-200);
  box-shadow: var(--shadow-sm);
}

.invite-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--text-primary);
}

.invite-meta {
  font-size: 0.72rem;
  color: var(--text-tertiary);
  margin-top: 0.35rem;
}

.invite-item-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.invite-status {
  font-size: 0.625rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 0.35rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--color-primary-100);
  color: var(--color-primary-700);
  font-weight: 600;
}
.invite-status.is-used {
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
}
.invite-status.is-revoked {
  background: #fee2e2;
  color: #b91c1c;
}

.invite-copy {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}
.invite-copy:hover {
  color: var(--color-primary-600);
  border-color: var(--color-primary-200);
  background: var(--color-primary-50);
}
.invite-copy.copied {
  color: var(--color-primary-600);
  border-color: var(--color-primary-300);
  background: var(--color-primary-100);
  animation: bounce-gentle 0.3s ease;
}

/* ----------------------------------------
   Upgrade Tab & Modal
   ---------------------------------------- */
.upgrade-tab {
  background: var(--gradient-primary);
  color: white;
  border: none;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}
.upgrade-tab::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
}
.upgrade-tab:hover {
  box-shadow: var(--shadow-glow-lg);
}

.upgrade-modal-content {
  animation: fadeInScale var(--duration-slow) var(--ease-spring);
}
.upgrade-benefit + .upgrade-benefit {
  margin-top: 0.5rem;
}

/* ----------------------------------------
   Empty State
   ---------------------------------------- */
.empty-state {
  animation: fadeInUp var(--duration-slow) var(--ease-out);
}
.empty-state-icon {
  animation: float 4s ease-in-out infinite;
}

/* ----------------------------------------
   Message Animations
   ---------------------------------------- */
[data-message] {
  animation: fadeInUp var(--duration-normal) var(--ease-out);
}
[data-message][data-role="user"] {
  animation: slideInRight var(--duration-normal) var(--ease-out);
}
[data-message][data-role="assistant"] {
  animation: slideInLeft var(--duration-normal) var(--ease-out);
}
.assistant-action-bar button {
  background: transparent;
  transition: background-color var(--duration-fast) var(--ease-out);
}
.assistant-action-bar button:hover,
.assistant-action-bar button:focus-visible {
  background: var(--bg-tertiary);
}
.assistant-action-bar button:active {
  background: var(--bg-secondary);
}
.regenerate-options {
  top: auto;
  bottom: 100%;
  margin-bottom: 0.5rem;
}
[data-tooltip] {
  position: relative;
}
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translate(-50%, 4px);
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  padding: 0.3rem 0.5rem;
  border-radius: 0.45rem;
  font-size: 0.7rem;
  line-height: 1.2;
  white-space: nowrap;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  z-index: 20;
  transition: opacity var(--duration-fast) var(--ease-out), transform var(--duration-fast) var(--ease-out);
}
[data-tooltip][data-tooltip-position="bottom"]::after {
  bottom: auto;
  top: calc(100% + 8px);
  transform: translate(-50%, -4px);
}
[data-tooltip]:hover::after,
[data-tooltip]:focus-visible::after {
  opacity: 1;
  transform: translate(-50%, 0);
}
[data-tooltip][data-tooltip-position="bottom"]:hover::after,
[data-tooltip][data-tooltip-position="bottom"]:focus-visible::after {
  transform: translate(-50%, 0);
}

/* ----------------------------------------
   Typing Indicator
   ---------------------------------------- */
.typing-indicator {
  display: inline-flex;
  gap: 4px;
  padding: 8px 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
}
.typing-indicator span {
  width: 6px;
  height: 6px;
  background: var(--color-primary-400);
  border-radius: 50%;
  animation: typing-dot 1.4s ease-in-out infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

/* ----------------------------------------
   Sidebar & Plan Card
   ---------------------------------------- */
.sidebar-item {
  transition: all var(--duration-fast) var(--ease-out);
}
.sidebar-item:hover {
  background: var(--bg-tertiary);
}
.sidebar-item.active {
  background: var(--gradient-subtle);
  border-color: var(--color-primary-200);
}

.plan-card {
  background: var(--gradient-subtle);
  border: 1px solid rgba(99, 102, 241, 0.1);
  border-radius: var(--radius-2xl);
  padding: 1.25rem;
  position: relative;
  overflow: hidden;
}
.plan-card::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 100px; height: 100px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
}

.plan-badge {
  background: var(--gradient-primary);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.plan-badge.free {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

/* ----------------------------------------
   Chat Input Container
   ---------------------------------------- */
.chat-input-container {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-3xl);
  box-shadow: var(--shadow-xl);
  transition: all var(--duration-fast) var(--ease-out);
}
.chat-input-container:focus-within {
  border-color: var(--border-default);
  box-shadow: var(--shadow-xl);
}

[data-input-error] {
  margin: 0.5rem 1.25rem 0;
  padding: 0.5rem 0.75rem;
  border-radius: 0.75rem;
  font-size: 0.75rem;
  line-height: 1.35;
  background: #dc2626;
  color: #fff;
}

/* ----------------------------------------
   Conversation Item
   ---------------------------------------- */
.conversation-item {
  transition: all var(--duration-fast) var(--ease-out);
  border-radius: var(--radius-xl);
  border-left: 3px solid transparent;
  padding: 0;
  cursor: pointer;
}
.conversation-item:hover {
  background: var(--bg-tertiary);
}
.conversation-item.active {
  background: var(--bg-tertiary);
  border-left-color: var(--color-primary-500);
}
.conversation-item-main {
  background: transparent;
  flex: 1 1 auto;
  min-width: 0;
  cursor: pointer;
  padding: 0.125rem 0.375rem;
}
.conversation-item [data-conversation-title] {
  min-width: 0;
  font-size: 0.8rem;
  line-height: 1.2;
}
.conversation-item[data-editing="true"] [data-conversation-title] {
  display: none;
}
.conversation-item[data-editing="true"] [data-conversation-input] {
  display: block;
}
.conversation-title-input {
  flex: 1 1 auto;
  min-width: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.2rem 0.4rem;
  font-size: 0.8rem;
  color: var(--text-primary);
}
.conversation-title-input:focus-visible {
  outline: none;
  box-shadow: none;
}
.conversation-menu-trigger {
  opacity: 0;
  width: 28px;
  height: 28px;
  position: relative;
  z-index: 5;
  cursor: pointer;
}
.conversation-item:hover .conversation-menu-trigger,
.conversation-menu-trigger:focus-visible,
.conversation-menu-trigger[aria-expanded="true"] {
  opacity: 1;
}
.conversation-menu-trigger:focus-visible {
  outline: 2px solid var(--color-primary-300);
  outline-offset: 2px;
}
.conversation-menu-options button:hover {
  background: var(--bg-tertiary);
}
.conversation-menu-options [data-conversation-action="delete"] {
  color: var(--color-error);
}
.conversation-menu-options [data-conversation-action="delete"] svg {
  color: var(--color-error);
}
.conversation-menu-options {
  right: 0;
  top: 100%;
  margin-top: 6px;
  bottom: auto;
  transform: none;
  z-index: 20;
}
.conversation-menu-options[data-open="up"] {
  top: auto;
  bottom: 100%;
  margin-bottom: 6px;
  margin-top: 0;
}

/* ----------------------------------------
   Scrollbar
   ---------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}
[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: var(--color-gray-600);
}

/* Dark Mode Specific Overrides */
[data-theme="dark"] .plan-card {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(124, 58, 237, 0.08) 100%);
  border-color: rgba(99, 102, 241, 0.2);
}

[data-theme="dark"] .card-gradient {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
  border-color: rgba(99, 102, 241, 0.15);
}

[data-theme="dark"] .markdown pre {
  background: #0f172a;
  border: 1px solid var(--border-light);
}

[data-theme="dark"] .markdown code {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
}

[data-theme="dark"] .invite-stat-card {
  background: var(--bg-primary);
}

[data-theme="dark"] .invite-list-panel {
  background: var(--bg-primary);
}

[data-theme="dark"] .invite-item {
  background: var(--bg-tertiary);
}

[data-theme="dark"] .invite-status-card {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
}

[data-theme="dark"] [data-tool-chip][data-status="running"] {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
}

[data-theme="dark"] [data-tool-chip][data-status="done"] {
  background: rgba(16, 185, 129, 0.15);
  border-color: rgba(16, 185, 129, 0.3);
  color: #6ee7b7;
}

[data-theme="dark"] [data-tool-chip][data-status="failed"] {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

[data-theme="dark"] .empty-state-icon {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.15) 0%, rgba(124, 58, 237, 0.15) 100%);
}

[data-theme="dark"] .btn-dark {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
}

[data-theme="dark"] .btn-dark:hover {
  background: var(--border-light);
}

[data-theme="dark"] .sidebar-item:hover {
  background: var(--bg-tertiary);
}

[data-theme="dark"] .conversation-item:hover {
  background: var(--bg-tertiary);
}

[data-theme="dark"] .conversation-item.active {
  background: var(--bg-tertiary);
  border-left: 3px solid var(--color-primary-400);
}

/* ----------------------------------------
   Focus & Selection
   ---------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-primary-400);
  outline-offset: 2px;
}
::selection {
  background: var(--color-primary-200);
  color: var(--color-primary-900);
}