:root {
  --bg-base: #0a0a0a;
  --bg-surface: #141414;
  --bg-elevated: #1e1e1e;
  --bg-input: #171717;
  --border-subtle: #262626;
  --border-strong: #383838;
  --border-focus: #71717a;
  --text-primary: #ededed;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent: #f4f4f5;
  --accent-contrast: #09090b;
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.12);
  --success: #22c55e;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition: 150ms ease;
}

[hidden] {
  display: none !important;
}

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

body {
  font-family: var(--font-stack);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

button:disabled, input:disabled, select:disabled, textarea:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

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

.shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  height: 100dvh;
  width: 100%;
}

.sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  padding: 14px 12px;
  gap: 12px;
  overflow: hidden;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px;
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
}

span.brand-mark {
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-primary);
  box-shadow: 6px 0 0 var(--text-primary), 0 6px 0 var(--text-primary), 6px 6px 0 var(--text-muted);
  transform: translateY(-3px);
  margin-right: 6px;
  flex-shrink: 0;
}

button.new-work {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--transition), border-color var(--transition);
}

button.new-work:hover:not(:disabled) {
  background: var(--border-subtle);
  border-color: var(--border-strong);
}

.sidebar-label {
  font-size: 0.6875rem;
  text-transform: none;
  letter-spacing: normal;
  color: var(--text-muted);
  padding: 6px 8px 0;
  font-weight: 600;
}

nav#conversation-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
  flex: 1;
}

button.conversation {
  display: flex;
  align-items: center;
  width: 100%;
  text-align: left;
  padding: 8px 10px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background var(--transition), color var(--transition);
}

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

button.conversation.active {
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-weight: 500;
  border-left: 2px solid var(--accent);
}

.sidebar-footer {
  border-top: 1px solid var(--border-subtle);
  padding-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

button#usage-button {
  width: auto;
  justify-content: flex-start;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
}

button#usage-button:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.sidebar-footer .account {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px;
}

.sidebar-footer .avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--border-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  flex-shrink: 0;
}

.main {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  min-width: 0;
  background: var(--bg-base);
  position: relative;
}

header.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-base);
  z-index: 10;
}

.topbar .spacer {
  flex: 1;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition);
}

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

button#menu-button {
  display: none;
}

.project-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.work-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.work-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}

button#work-button {
  width: auto;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-secondary);
  transition: border-color var(--transition), color var(--transition);
}

button#work-button:hover {
  border-color: var(--border-strong);
  color: var(--text-primary);
}

main#messages {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  padding: 28px 24px;
  gap: 24px;
  position: relative;
  display: flex;
  flex-direction: column;
}

main#messages .messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 20px 40px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.welcome {
  margin: auto auto;
  max-width: 640px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.welcome .eyebrow {
  font-size: 0.75rem;
  text-transform: none;
  letter-spacing: normal;
  color: var(--text-muted);
  font-weight: 600;
}

.welcome h1 {
  font-size: 1.875rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.welcome p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.suggestions {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 14px;
  text-align: left;
}

button.suggestion {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  font-size: 0.84rem;
  color: var(--text-secondary);
  text-align: left;
  line-height: 1.4;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.suggestion strong { color: var(--text-primary); font-weight: 550; }
.suggestion span { font-size: .78rem; color: var(--text-muted); }
.sidebar-footer .account > div { min-width: 0; flex: 1; font-size: .78rem; }
.sidebar-footer .account > div strong { display: block; overflow: hidden; text-overflow: ellipsis; }
.sidebar-footer .account .muted { font-size: .69rem; margin-top: 3px; }
.sidebar-footer .account button { flex-shrink: 0; }
.message-content { overflow-wrap: anywhere; }

button.suggestion:hover {
  border-color: var(--border-strong);
  background: var(--bg-elevated);
  color: var(--text-primary);
}

main .empty {
  margin: auto;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.message {
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.message-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.message-content {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.message.user .message-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
}

.message.user a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.message.assistant .message-content {
  padding: 4px 0;
  color: var(--text-primary);
}

footer.composer-area {
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
  padding: 0 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.attachment-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

span.file-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  padding: 3px 10px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

button.remove-file {
  font-size: 0.9rem;
  line-height: 1;
  color: var(--text-muted);
  padding: 0 2px;
}

button.remove-file:hover {
  color: var(--danger);
}

form#composer {
  width: 100%;
}

.composer-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color var(--transition);
}

.composer-box:focus-within {
  border-color: var(--border-strong);
}

textarea#prompt {
  width: 100%;
  background: transparent;
  border: none;
  resize: none;
  outline: none;
  font-size: 0.9375rem;
  line-height: 1.4;
  color: var(--text-primary);
  max-height: 200px;
}

.composer-actions {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.composer-actions > .icon-button,
.composer-actions > .send-button {
  flex-shrink: 0;
}

select#model-select {
  /* Disabled options also contribute to a native select's intrinsic width. */
  flex: 1 1 0;
  min-width: 0;
  max-width: 100%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 5px 10px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  outline: none;
}

select#model-select:hover {
  border-color: var(--border-strong);
}

button#send-button.send-button {
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 600;
  transition: opacity var(--transition);
}

button#send-button.send-button:hover:not(:disabled) {
  opacity: 0.9;
}

p.composer-note {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

.status-line {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-size: 0.75rem;
}

span.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}

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

.error-banner {
  background: var(--danger-bg);
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  text-align: center;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: 0.6875rem;
  font-weight: 600;
  border-radius: 9999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  text-transform: uppercase;
}

div#toast.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  z-index: 100;
}

.modal.login-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 200;
}

div.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 28px;
  max-width: 360px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-card h1 {
  font-size: 1.25rem;
  font-weight: 600;
}

.modal-card p {
  font-size: 0.84rem;
  color: var(--text-secondary);
}

form#login-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

form#login-form label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

form#login-form input {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 0.875rem;
  outline: none;
}

form#login-form input:focus {
  border-color: var(--border-focus);
}

button.primary-button {
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: opacity var(--transition);
}

button.primary-button:hover:not(:disabled) {
  opacity: 0.9;
}

p#login-error {
  color: var(--danger);
  font-size: 0.78rem;
}

.work-panel {
  visibility: hidden;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 300px;
  background: var(--bg-surface);
  border-left: 1px solid var(--border-subtle);
  transform: translateX(100%);
  transition: transform 200ms ease;
  z-index: 50;
  display: flex;
  flex-direction: column;
}

body.work-open .work-panel {
  visibility: visible;
  transform: translateX(0);
}

.work-panel header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.875rem;
  font-weight: 600;
}

.panel-close {
  color: var(--text-muted);
  padding: 4px;
}

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

.work-steps {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  overflow-y: auto;
}

.step {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.step-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.step.queued .step-dot {
  background: var(--border-strong);
}

.step.running .step-dot {
  background: var(--accent);
  animation: pulse-dot 1.2s infinite ease-in-out;
}

.step.running {
  color: var(--text-primary);
  font-weight: 500;
}

.step.completed .step-dot {
  background: var(--text-muted);
}

.step.failed .step-dot {
  background: var(--danger);
}

.step.failed {
  color: var(--danger);
}

.work-detail {
  padding: 12px 16px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  z-index: 35;
  border: none;
  padding: 0;
  width: 100%;
  height: 100%;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.85); }
}

@media (max-width: 768px) {
  header.topbar { gap: 8px; padding: 10px 14px; }
  .work-badge { font-size: .67rem; min-width: 0; white-space: normal; }
  .project-label { font-size: .8rem; white-space: nowrap; }
  button#work-button { padding: 6px 9px; font-size: .73rem; }
  main#messages { padding: 24px 18px; }
  .welcome h1 { font-size: 1.65rem; }
  .shell {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    width: 260px;
    transform: translateX(-100%);
    transition: transform 200ms ease;
    z-index: 40;
  }
  body.sidebar-open .sidebar {
    transform: translateX(0);
  }
  body.sidebar-open .backdrop {
    display: block;
  }
  button#menu-button {
    display: inline-flex;
    flex-shrink: 0;
  }
  .suggestions {
    grid-template-columns: 1fr;
  }
  .work-panel {
    width: 100%;
    max-width: 320px;
  }
}

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