button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary,
.btn-secondary,
.btn-new-chat {
  min-height: 40px;
  border-radius: var(--radius-md);
  padding: 0 var(--space-4);
  font-weight: var(--weight-medium);
}

.btn-primary {
  color: var(--color-accent-text);
  background: var(--color-accent);
}

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

.btn-secondary,
.btn-new-chat {
  border: var(--border-thin);
  background: var(--color-paper-raised);
}

.btn-new-chat {
  width: 100%;
  text-align: left;
}

.btn-icon,
.btn-attach,
.btn-send,
.avatar-button {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
}

.btn-icon svg,
.btn-attach svg,
.btn-send svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.btn-send {
  background: var(--color-accent);
  color: var(--color-accent-text);
}

.btn-send:disabled {
  opacity: 0.45;
}

.btn-send.is-stop {
  background: var(--color-ink-muted);
}

.avatar-button {
  background: var(--color-paper-raised);
  border: var(--border-thin);
  font-weight: var(--weight-bold);
}

.conv-item {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2);
  align-items: center;
  padding: var(--space-2) var(--space-3);
  border-left: 3px solid transparent;
  border-radius: var(--radius-md);
  color: var(--color-ink);
}

.conv-item:hover,
.conv-item:focus-within {
  background: color-mix(in srgb, var(--color-paper-sunken) 70%, transparent);
}

.conv-item--active {
  border-left-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-paper-sunken) 80%, transparent);
}

.conv-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: left;
}

.conv-actions {
  display: flex;
  gap: var(--space-1);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.conv-item:hover .conv-actions,
.conv-item:focus-within .conv-actions {
  opacity: 1;
}

.conv-actions button {
  color: var(--color-ink-muted);
  font-size: var(--text-xs);
}

.conv-rename-input {
  width: 100%;
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  background: var(--color-paper-raised);
  padding: var(--space-1) var(--space-2);
}

.sidebar-empty {
  color: var(--color-ink-muted);
  padding: var(--space-4);
}

.input-bar {
  display: flex;
  align-items: end;
  gap: var(--space-2);
  background: var(--color-paper-raised);
  border: var(--border-thin);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--space-2);
}

#message-input {
  outline: none;
  width: 100%;
  min-height: 36px;
  max-height: 200px;
  resize: none;
  border: 0;
  background: transparent;
  padding: var(--space-2) 0;
  overflow-y: hidden;
}

#message-input:disabled {
  opacity: 0.6;
}

.input-meta {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-2);
}

.model-selector-trigger {
  color: var(--color-ink-muted);
}

#model-selector-panel {
  position: absolute;
  left: max(var(--space-4), calc((100% - var(--chat-max-width)) / 2));
  bottom: calc(100% - var(--space-2));
  width: 300px;
  max-height: 400px;
  overflow-y: auto;
  background: var(--color-paper-raised);
  border: var(--border-thin);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-2);
  transition: opacity var(--transition-fast);
}

.model-row,
.model-nav-row,
.model-back {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-align: left;
  cursor: pointer;
}

.model-row:hover,
.model-row:focus-visible,
.model-nav-row:hover,
.model-back:hover {
  background: var(--color-paper-sunken);
}

.model-name { flex: 1; }

.model-badges {
  display: flex;
  gap: var(--space-1);
}

.model-badge {
  color: var(--color-ink-muted);
  border: var(--border-thin);
  border-radius: var(--radius-full);
  padding: 0 var(--space-2);
  font-size: var(--text-xs);
}

.model-star {
  color: var(--color-ink-muted);
  font-size: var(--text-lg);
}

.model-star.is-active {
  color: var(--color-accent);
}

.model-rule {
  border: 0;
  border-top: var(--border-thin);
  margin: var(--space-2) 0;
}

.attachment-preview-row {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  margin-bottom: var(--space-2);
}

.attachment-chip {
  height: 48px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex: 0 0 auto;
  max-width: 240px;
  border: var(--border-thin);
  border-radius: var(--radius-md);
  background: var(--color-paper-raised);
  padding: var(--space-1) var(--space-2);
}

.attachment-thumb {
  width: 36px;
  height: 36px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: var(--color-paper-sunken);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.attachment-thumb svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

.attachment-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--text-sm);
}

.btn-remove {
  color: var(--color-ink-muted);
  font-size: var(--text-lg);
}

.profile-username {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}

.profile-email {
  color: var(--color-ink-muted);
  margin-top: var(--space-1);
}

.credits-amount {
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
}

.credits-display small {
  color: var(--color-ink-muted);
}

.topup-inline {
  margin-top: var(--space-3);
  display: grid;
  gap: var(--space-2);
}

.topup-inline label {
  display: grid;
  gap: var(--space-1);
  color: var(--color-ink-muted);
  font-size: var(--text-sm);
}

.topup-inline input {
  min-height: 38px;
  border: var(--border-thin);
  border-radius: var(--radius-md);
  background: var(--color-paper);
  padding: 0 var(--space-3);
}

.theme-toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#theme-toggle {
  width: 42px;
  height: 24px;
  appearance: none;
  border-radius: var(--radius-full);
  background: var(--color-ink-faint);
  position: relative;
}

#theme-toggle::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  top: 2px;
  left: 2px;
  border-radius: 50%;
  background: var(--color-paper-raised);
  transition: transform var(--transition-fast);
}

#theme-toggle:checked {
  background: var(--color-accent);
}

#theme-toggle:checked::after {
  transform: translateX(18px);
}

#toast-container {
  position: fixed;
  left: 50%;
  bottom: var(--space-6);
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 300;
}

.toast {
  color: var(--color-paper);
  background: var(--color-ink);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.toast--exit {
  opacity: 0;
  transform: translateY(8px);
}

#dialog-overlay,
#lightbox {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.34);
  z-index: 320;
  padding: var(--space-4);
}

.dialog-card {
  width: min(100%, 360px);
  background: var(--color-paper-raised);
  border: var(--border-thin);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-5);
}

.dialog-title {
  font-weight: var(--weight-bold);
}

.dialog-body {
  color: var(--color-ink-muted);
  margin-top: var(--space-2);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

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

.lightbox-card {
  position: relative;
  max-width: min(96vw, 960px);
  max-height: 92vh;
}

.lightbox-card img {
  max-height: 92vh;
  object-fit: contain;
  background: var(--color-paper-raised);
}

.lightbox-card button {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  background: var(--color-ink);
  color: var(--color-paper);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-3);
}

@media (max-width: 767px) {
  .conv-actions { opacity: 1; }
  .input-meta #input-hint { display: none; }
  #model-selector-panel {
    left: var(--space-4);
    right: var(--space-4);
    width: auto;
  }
}