/* Product-level visual system and component refinements. */
:root {
  --md-font-size: 15px;
  --text-xs: 12px;
  --text-sm: 13px;
  --text-base: 15px;
  --text-lg: 17px;
  --text-xl: 20px;
  --text-2xl: 26px;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 999px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 24px 64px rgba(15, 23, 42, 0.16);
  --sidebar-expanded-width: clamp(160px, 14vw, 240px);
  --rail-default-width: clamp(280px, 30vw, 420px);
  --rail-collapsed-width: 44px;
  --focus-ring: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent);
  --bg-surface: #f4eedc;
  --bg-elevated: #faf4e4;
  --toolbar-menu-bg: #ddd6c1;
  --toolbar-menu-selected-bg: #d3cbb5;
  --empty-state-icon-bg: #e4decb;
  --hover-bg: rgba(86, 92, 101, 0.08);
  --send-btn-disabled-bg: #b9baa9;
  --send-btn-disabled-text: #6c7069;
}

html[data-theme="daylight"] {
  --bg: #ffffff;
  --bg2: #f6f7f9;
  --bg3: #ffffff;
  --bg4: #f9fafb;
  --bg-surface: #ffffff;
  --bg-elevated: #ffffff;
  --toolbar-menu-bg: #ffffff;
  --toolbar-menu-selected-bg: #edf2ff;
  --empty-state-icon-bg: #edf2ff;
  --border: #e5e7eb;
  --border-strong: #cfd4dc;
  --text: #3f4754;
  --text1: #171a21;
  --text2: #5f6876;
  --muted: #89919e;
  --accent: #315ee7;
  --accent-hover: #234bc8;
  --accent-soft: #edf2ff;
  --accent-text: #ffffff;
  --send-btn-bg: #315ee7;
  --send-btn-hover: #234bc8;
  --send-btn-disabled-bg: #d1d5db;
  --send-btn-disabled-text: #7f8792;
  --user-bg: #ebf5ff;
  --assistant-bg: transparent;
  --composer-bg: #ffffff;
  --chat-header-bg: rgba(255, 255, 255, 0.88);
  --hover-bg: rgba(17, 24, 39, 0.055);
}

html[data-theme="daylight"] .session-item.active,
html[data-theme="daylight"] .doc-entry.active {
  background: #e1e4e8;
}

html[data-theme="monochrome"] {
  --bg: #202020;
  --bg2: #181818;
  --bg3: #2c2c2c;
  --bg4: #303030;
  --bg-surface: #2e2e2e;
  --bg-elevated: #323232;
  --toolbar-menu-bg: #2c2c2c;
  --toolbar-menu-selected-bg: #383838;
  --empty-state-icon-bg: #333333;
  --border: #4a4a4a;
  --border-strong: #626262;
  --text: #d5d5d5;
  --text1: #f4f4f4;
  --text2: #b7b7b7;
  --muted: #858585;
  --send-btn-disabled-bg: #3c3c3c;
  --send-btn-disabled-text: #7d7d7d;
  --hover-bg: rgba(255, 255, 255, 0.065);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 10px 28px rgba(0, 0, 0, 0.32);
  --shadow-lg: 0 28px 72px rgba(0, 0, 0, 0.48);
}

html,
body {
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  font-size: var(--text-base);
}

body {
  width: 100vw;
  min-width: 0;
  background: var(--bg);
  color: var(--text);
}

button,
input,
select,
textarea {
  font: inherit;
}
button {
  -webkit-tap-highlight-color: transparent;
}
button:focus-visible,
select:focus-visible,
textarea:focus-visible,
input:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

* {
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

.lucide {
  width: 18px;
  height: 18px;
  stroke-width: 1.8;
  flex: 0 0 auto;
}
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text2);
  background: transparent;
  cursor: pointer;
  transition:
    color 0.15s ease,
    background 0.15s ease,
    border-color 0.15s ease,
    transform 0.15s ease;
}
.icon-button:hover {
  color: var(--text1);
  background: var(--hover-bg);
}
.icon-button:active {
  transform: scale(0.96);
}

/* Sidebar */
#sidebar {
  width: var(--sidebar-expanded-width);
  min-width: 180px;
  max-width: 280px;
  flex: 0 0 var(--sidebar-expanded-width);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  transition:
    width 0.2s ease,
    min-width 0.2s ease,
    flex-basis 0.2s ease;
  overflow: visible;
}
#sidebar-resize {
  display: none;
}
#sidebar-header {
  padding: var(--space-4) var(--space-3) var(--space-3);
  border: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px;
  gap: var(--space-3) var(--space-2);
}
.sidebar-brand {
  display: flex;
  align-items: center;
  min-width: 0;
  margin-left: var(--space-1);
}
#sidebar-header h1 {
  color: var(--text1);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
}
#sidebar-collapse-btn {
  justify-self: end;
  width: 34px;
  height: 34px;
}
#new-session-btn {
  grid-column: 1 / -1;
  width: 100%;
  min-height: 36px;
  margin-top: var(--space-1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0 var(--space-3);
  color: var(--accent-text);
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
}
#new-session-btn:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}
#new-session-btn .lucide {
  width: 16px;
  height: 16px;
}
#session-list {
  padding: var(--space-1) var(--space-2) var(--space-3);
  overflow-y: auto;
  overflow-x: hidden;
  min-height: 0;
}
.session-list-empty {
  padding: var(--space-6) var(--space-3);
  color: var(--muted);
  font-size: var(--text-sm);
  text-align: center;
}
.session-item {
  min-height: 48px;
  padding: var(--space-3) var(--space-3);
  margin-bottom: var(--space-1);
  border: 0;
  border-radius: var(--radius-md);
  gap: var(--space-2);
  transition:
    background 0.15s ease,
    color 0.15s ease;
}
.session-item:hover {
  background: var(--hover-bg);
  border: 0;
}
.session-item.active {
  background: var(--bg-surface);
  border: 0;
  box-shadow: var(--shadow-sm);
}
.session-title {
  color: var(--text1);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
}
.session-meta {
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
}
.session-delete-btn {
  border: 0;
}
#sidebar-settings {
  position: relative;
  margin-top: auto;
  padding: var(--space-2) var(--space-3);
  display: flex;
}
#settings-btn,
#help-btn {
  width: 34px;
  height: 34px;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text2);
  font-size: 0;
}
#settings-btn:hover,
#help-btn:hover {
  background: var(--hover-bg);
}
#status-bar {
  min-height: 42px;
  padding: var(--space-2) var(--space-4) var(--space-3);
  border: 0;
  color: var(--muted);
}
.status-dot {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--danger) 14%, transparent);
}
.status-dot.connected {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--status-connected) 16%, transparent);
}
#sidebar.collapsed {
  width: 44px;
  min-width: 44px;
  flex-basis: 44px;
}
#sidebar.collapsed #sidebar-header {
  display: flex;
  flex-direction: column;
  padding: var(--space-2) 6px;
  gap: var(--space-2);
}
#sidebar.collapsed .sidebar-brand,
#sidebar.collapsed #new-session-btn,
#sidebar.collapsed #session-list,
#sidebar.collapsed #status-text,
#sidebar.collapsed #account-name {
  display: none;
}
#account-name {
  margin-right: 4px;
  color: var(--text1);
  font-weight: var(--weight-semibold);
}
.account-title-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
#account-panel-account {
  color: var(--text2);
  font-size: 12px;
}
#sidebar.collapsed #sidebar-collapse-btn {
  order: -1;
}
#sidebar.collapsed #sidebar-settings {
  padding: var(--space-2) 5px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
#sidebar.collapsed #status-bar {
  justify-content: center;
  padding: var(--space-3) 0;
}

/* Menus */
.settings-dropdown {
  position: absolute;
  width: 172px;
  padding: var(--space-1);
  bottom: calc(100% + 6px);
  left: var(--space-2);
  margin: 0;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px);
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-md);
  transition:
    visibility 0s 0.16s,
    opacity 0.16s ease,
    transform 0.16s ease;
}
.settings-dropdown.open {
  display: block;
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: none;
  transition-delay: 0s;
}
.settings-category {
  border-radius: var(--radius-sm);
  padding: 10px var(--space-3);
  color: var(--text1);
}
.settings-category:hover {
  background: var(--hover-bg);
}
.settings-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}
.settings-toggle-row .toggle-wrap {
  margin: 0;
}
.settings-submenu {
  width: 148px;
  padding: var(--space-1);
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-4px);
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition:
    visibility 0s 0.15s,
    opacity 0.15s ease,
    transform 0.15s ease;
}
.settings-category:hover .settings-submenu {
  display: block;
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: none;
  transition-delay: 0s;
}
.settings-option {
  border-radius: var(--radius-sm);
  color: var(--text1);
}
.settings-option.active {
  color: var(--accent);
  font-weight: var(--weight-semibold);
}
.settings-option:hover {
  background: var(--hover-bg);
}
.settings-action,
.settings-logout {
  display: block;
  width: 100%;
  margin-top: 4px;
  border: 0;
  border-top: 1px solid var(--border);
  background: transparent;
  text-align: left;
  font: inherit;
  cursor: pointer;
  border-radius: var(--radius-sm);
  padding: 10px var(--space-3);
  color: var(--text1);
}
.settings-action:hover,
.settings-logout:hover {
  background: var(--hover-bg);
}
.settings-logout[hidden] {
  display: none;
}
#account-modal {
  position: static;
  display: none;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}
#account-modal.open {
  position: fixed;
  display: flex;
  inset: 0;
  z-index: 20;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  background: rgba(15, 23, 42, 0.28);
  backdrop-filter: blur(5px);
}
#account-panel {
  width: min(560px, calc(100vw - 40px));
  max-height: min(720px, calc(100vh - 40px));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-lg);
}
#account-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
}
#account-panel .panel-scroll-body {
  padding: var(--space-4) var(--space-5) var(--space-5);
}
.account-note,
.account-status {
  color: var(--text2);
  font-size: 13px;
}
.account-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 12px 0;
}
.account-field input,
.account-field select,
.account-secret input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  background: var(--bg);
  color: var(--text1);
  font: inherit;
}
.account-secret {
  display: flex;
  gap: 8px;
}
.account-secret button,
#account-save {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text1);
  cursor: pointer;
  padding: 8px 12px;
}
#account-save {
  margin-top: 8px;
}
.account-field small {
  color: var(--text2);
  font-size: 12px;
}
#account-form h3,
.account-rotate h3 {
  margin: 18px 0 0;
  font-size: 14px;
}
.account-rotate p {
  margin: 8px 0;
  color: var(--text2);
  font-size: 13px;
}
#account-rotate-result {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}
#account-rotate-result[hidden] {
  display: none;
}
#account-rotate-token {
  flex: 1;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  background: var(--bg);
  color: var(--text1);
  font: inherit;
}

/* Main chat */
#chat-header {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 60px;
  padding: var(--space-3) var(--space-5);
  background: var(--chat-header-bg);
  border-color: var(--border);
  backdrop-filter: blur(14px);
}
#chat-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  max-width: calc(50% - 70px);
}
#chat-title {
  min-width: 0;
  color: var(--text1);
  font-weight: var(--weight-semibold);
}
#chat-toolbar {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0;
  margin-left: auto;
}
#token-display {
  display: none;
  align-items: center;
  height: 32px;
  margin-left: 4px;
  padding: 0 2px;
  color: var(--text2);
  font-size: 12px;
  line-height: 1;
  white-space: nowrap;
}
#token-display:not(:empty) {
  display: inline-flex;
}
#chat-actions {
  position: static;
  flex: 0 0 auto;
  margin-left: 0;
  transform: none;
}
.header-icon-btn {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
}
.header-icon-btn:hover {
  background: var(--hover-bg);
  border-color: transparent;
  color: var(--text1);
}
#messages {
  padding: var(--space-8) var(--conversation-inline-padding);
  gap: var(--space-6);
  transition: opacity 0.15s ease;
}
.message,
.message.user {
  width: 100%;
  max-width: var(--conversation-content-max-width);
}
.message.user {
  align-items: stretch;
}
.message-bubble {
  font-size: var(--md-font-size);
  line-height: 1.6;
}
.message.user .message-bubble {
  width: auto;
  max-width: 100%;
  padding: 11px 15px;
  background: var(--user-bg);
  border: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-sm) var(--radius-lg);
  box-shadow: none;
}
.message.user .message-bubble.is-collapsible {
  position: relative;
}
.message.user .message-bubble.is-collapsible .message-content {
  padding-bottom: 34px;
}
.message.user .message-bubble.is-collapsed .message-content {
  max-height: 8em;
  overflow: hidden;
}
.message.user .message-bubble.is-collapsed .message-content::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 48px;
  content: "";
  border-radius: 0 0 var(--radius-sm) var(--radius-lg);
  background: linear-gradient(transparent, var(--user-bg));
  pointer-events: none;
}
.user-message-toggle {
  position: absolute;
  right: 8px;
  bottom: 7px;
  min-width: 46px;
  height: 26px;
  padding: 0 8px;
  border: 1px solid color-mix(in srgb, var(--text1) 65%, transparent);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--text1) 85%, var(--bg3) 15%);
  color: var(--bg3);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  line-height: 1;
}
.user-message-toggle:hover {
  background: color-mix(in srgb, var(--text) 90%, var(--bg3) 10%);
  color: var(--bg3);
}
.user-message-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
html[data-theme="daylight"] .user-message-toggle {
  border-color: var(--border-strong);
  background: #e1e4e8;
  color: var(--text1);
}
html[data-theme="daylight"] .user-message-toggle:hover {
  background: #d8dce1;
  color: var(--text1);
}
html[data-theme="monochrome"] .user-message-toggle {
  border-color: var(--accent-hover);
  background: var(--accent);
  color: var(--accent-text);
}
html[data-theme="monochrome"] .user-message-toggle:hover {
  background: var(--accent-hover);
  color: var(--accent-text);
}
.message.assistant .message-bubble {
  padding: 0;
  color: var(--text);
}
.message.message-new {
  animation: message-enter 0.3s cubic-bezier(0.2, 0.75, 0.3, 1);
}
#messages.session-enter {
  animation: session-enter 0.18s ease-out;
}
@keyframes message-enter {
  from {
    opacity: 0;
    transform: translateY(7px);
  }
}
@keyframes session-enter {
  from {
    opacity: 0;
  }
}
.markdown-body {
  line-height: 1.6;
}
.markdown-body h1 {
  font-size: 1.6em;
  font-weight: var(--weight-extrabold);
}
.markdown-body h2 {
  font-size: 1.3em;
  font-weight: var(--weight-bold);
}
.markdown-body h3 {
  font-size: 1.1em;
  font-weight: var(--weight-semibold);
}
.markdown-body h4 {
  font-weight: var(--weight-semibold);
  font-style: normal;
}
.markdown-body p {
  margin: 1em 0;
}
.markdown-body strong {
  color: var(--text1);
  font-weight: var(--weight-bold);
}
.markdown-body pre {
  padding: var(--space-4);
  border-radius: var(--radius-md);
}
#doc-preview-content.markdown-body blockquote {
  background: var(--user-bg);
}
html[data-theme="monochrome"] #doc-preview-content.markdown-body blockquote {
  background: #292929;
}
.reasoning-block summary,
.tool-block summary {
  font-weight: var(--weight-medium);
  color: var(--text2);
}
.reasoning-content,
.tool-block-result {
  border-radius: var(--radius-md);
  box-shadow: none;
}
.restart-round-btn {
  border: 0;
  background: transparent;
}
.restart-round-btn:hover {
  background: var(--danger-soft);
}

.empty-state,
#empty-state,
#no-session {
  color: var(--muted);
  text-align: center;
}
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}
.empty-state-icon,
#empty-state .icon {
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-2);
  color: var(--accent);
  background: var(--empty-state-icon-bg);
  border-radius: var(--radius-lg);
}
.empty-state-icon .lucide,
#empty-state .lucide {
  width: 25px;
  height: 25px;
}
.empty-state-title {
  color: var(--text1);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}
.empty-state-copy {
  color: var(--muted);
  font-size: var(--text-sm);
}

/* Composer */
#input-area {
  padding: var(--space-3) var(--conversation-inline-padding) var(--space-5);
}
#composer {
  width: 100%;
  max-width: var(--conversation-content-max-width);
  margin: 0 auto;
  border-radius: var(--radius-lg);
  border-color: var(--border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.035);
  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}
#composer:focus-within {
  border-color: var(--border-strong);
  box-shadow: 0 5px 16px rgba(0, 0, 0, 0.11);
}
#message-input {
  min-height: 64px;
  padding: var(--space-4) var(--space-4) var(--space-3);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
#message-input::placeholder {
  color: var(--muted);
}
#composer-toolbar {
  min-height: 48px;
  padding: 6px var(--space-2) var(--space-2);
  border-top: 1px solid var(--border);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  gap: var(--space-2);
}
.composer-left,
.composer-right {
  gap: 6px;
}
.composer-action-btn {
  width: 32px;
  height: 32px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text2);
  cursor: pointer;
}
.composer-action-btn:hover:not(:disabled) {
  color: var(--text1);
  background: var(--hover-bg);
}
.composer-action-btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}
#compact-btn {
  width: 32px;
  height: 32px;
  min-width: 32px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text2);
  cursor: pointer;
}
#compact-btn:hover:not(:disabled) {
  color: var(--text1);
  background: var(--hover-bg);
}
#compact-btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}
.toolbar-menu-control {
  position: relative;
  display: inline-flex;
  min-width: 0;
  color: var(--text2);
  font-family: inherit;
  font-size: var(--text-xs);
}
.toolbar-select {
  justify-content: space-between;
  min-width: 92px;
  max-width: 150px;
  height: 32px;
  border-radius: 8px;
  background: var(--bg4);
  padding: 0 var(--space-2);
}
.toolbar-select-value {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.toolbar-select .lucide {
  width: 14px;
  height: 14px;
  margin-left: var(--space-2);
  flex: 0 0 auto;
  stroke-width: 1.8;
}
.toolbar-select-menu {
  position: absolute;
  right: 0;
  bottom: calc(100% + 6px);
  z-index: 30;
  display: none;
  width: max-content;
  min-width: 100%;
  max-width: min(300px, calc(100vw - 32px));
  max-height: 240px;
  overflow-y: auto;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--toolbar-menu-bg);
  color: var(--text2);
  font: inherit;
  box-shadow: var(--shadow-md);
}
.toolbar-menu-control.open .toolbar-select-menu {
  display: grid;
  gap: 2px;
}
.toolbar-select-option {
  width: 100%;
  min-height: 32px;
  overflow: hidden;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  font: inherit;
  padding: 6px var(--space-2);
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.toolbar-select-option:hover,
.toolbar-select-option:focus-visible {
  background: var(--hover-bg);
  color: var(--text1);
}
.toolbar-select-option.selected {
  background: var(--toolbar-menu-selected-bg);
  color: var(--text1);
}
.toolbar-menu-group-title {
  padding: 6px var(--space-2) 2px;
  font-size: 11px;
  font-weight: var(--weight-semibold);
  letter-spacing: 0.04em;
  color: var(--muted);
  text-transform: uppercase;
}
.toolbar-provider-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 32px;
  padding: 6px var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--text2);
  cursor: default;
}
.toolbar-provider-row:hover {
  background: var(--hover-bg);
  color: var(--text1);
}
.toolbar-provider-arrow {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  stroke-width: 1.8;
}
.toolbar-provider-flyout {
  position: absolute;
  z-index: 31;
  display: none;
  width: 190px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--toolbar-menu-bg);
  color: var(--text2);
  box-shadow: var(--shadow-md);
}
.toolbar-provider-flyout.open {
  display: block;
}
#send-btn {
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: var(--radius-sm);
  margin-left: 9px;
  background: var(--send-btn-bg);
  color: var(--accent-text);
  box-shadow: none;
  transition:
    background 0.15s ease,
    box-shadow 0.15s ease;
}
#send-btn:hover:not(:disabled) {
  background: var(--send-btn-hover);
}
#send-btn:focus-visible {
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.16);
}
#send-btn:disabled {
  border: 0;
  background: var(--send-btn-disabled-bg);
  color: var(--send-btn-disabled-text);
  box-shadow: none;
  cursor: not-allowed;
  opacity: 1;
}
#send-btn .lucide {
  width: 17px;
  height: 17px;
  stroke-width: 2.2;
}
#send-btn .send-stop-icon {
  width: 13px;
  height: 13px;
  fill: currentColor;
  stroke-width: 0;
}

/* Document rail */
#doc-rail-resize {
  width: 6px;
  flex-basis: 6px;
}
#action-rail {
  position: relative;
  width: var(--rail-default-width);
  border-left: 0;
  transition:
    width 0.2s ease,
    min-width 0.2s ease;
}
#action-rail > #doc-rail-toggle {
  position: absolute;
  top: var(--space-3);
  left: 8px;
  z-index: 3;
  background: var(--bg-surface);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}
/* Collapsed rail shows an edit button on the strip so the active document
   can be toggled into edit mode without expanding the rail. */
#action-rail > #doc-rail-edit-btn {
  position: absolute;
  top: var(--space-3);
  left: 6px;
  z-index: 3;
  visibility: hidden;
  pointer-events: none;
}
/* File browsing and preview share a single continuous rail surface. */
#doc-browser {
  padding: 0;
  gap: 0;
}
#doc-columns,
#doc-preview-panel {
  border: 0;
  border-radius: 0;
  background: transparent;
}
#doc-columns {
  grid-template-columns:
    minmax(80px, var(--doc-column-1-width, 1fr))
    8px
    minmax(80px, 1fr);
}
.doc-column {
  border-right: 0;
}
.doc-column-resizer {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  cursor: col-resize;
  user-select: none;
  background: linear-gradient(
    to right,
    transparent 3px,
    var(--border) 3px,
    var(--border) 5px,
    transparent 5px
  );
}
.doc-column-resizer::after {
  width: 4px;
  height: 40px;
  border: 1px solid var(--bg);
  border-radius: var(--radius-sm);
  background: color-mix(
    in srgb,
    var(--toolbar-menu-selected-bg) 50%,
    var(--border-strong)
  );
  content: "";
}
.doc-column-resizer:hover::after,
.doc-column-resizer.dragging::after {
  background: var(--accent);
}
#doc-vertical-resizer {
  height: 8px;
  flex-basis: 8px;
  background: linear-gradient(
    to bottom,
    var(--border-strong) 0 2px,
    var(--bg4) 2px 100%
  );
}
#doc-vertical-resizer::after {
  width: 56px;
  height: 4px;
  transform: translateY(-3px);
  border: 1px solid var(--border-strong);
  background: color-mix(
    in srgb,
    var(--toolbar-menu-selected-bg) 50%,
    var(--border-strong)
  );
  opacity: 1;
}
#doc-vertical-resizer:hover::after {
  background: var(--accent);
}
#doc-preview-toolbar {
  border-bottom-color: var(--border);
  background: var(--bg4);
}
/* 根目录切换 tabs（覆盖 base 浅色样式，跟随主题） */
#doc-root-tabs {
  display: flex;
  flex-shrink: 0;
  gap: 4px;
  padding: 6px 8px;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  background: var(--bg4);
}
.doc-root-tab {
  border: 0;
  border-radius: var(--radius-sm);
  color: var(--text2);
  transition:
    background 0.12s ease,
    color 0.12s ease;
}
.doc-root-tab:hover {
  background: var(--hover-bg);
  color: var(--text);
}
.doc-root-tab.active {
  background: var(--toolbar-menu-selected-bg);
  color: var(--text1);
  box-shadow: none;
}

/* 文件标签条（覆盖 base 浅色样式，跟随主题） */
#doc-tabs {
  height: 36px;
  min-height: 36px;
  border-bottom: 1px solid var(--border);
  background: var(--bg4);
}
.doc-tab-icon {
  width: 14px;
  height: 14px;
}
.doc-tab-close-icon {
  width: 12px;
  height: 12px;
}
.doc-root-tab-icon {
  width: 14px;
  height: 14px;
}
.doc-tab {
  border-radius: var(--radius-sm);
  border-color: var(--border);
  color: var(--text2);
  transition:
    background 0.12s ease,
    color 0.12s ease,
    border-color 0.12s ease;
}
.doc-tab:hover {
  background: var(--hover-bg);
  color: var(--text);
}
.doc-tab.active {
  background: var(--toolbar-menu-selected-bg);
  border-color: var(--border-strong);
  color: var(--text1);
  box-shadow: none;
  font-weight: 500;
}
.doc-tab-close {
  border-radius: var(--radius-sm);
  transition: background 0.12s ease, color 0.12s ease;
}
.doc-tab-close:hover {
  background: var(--danger-soft);
  color: var(--danger);
}

.doc-column-header {
  font-weight: var(--weight-semibold);
}
.doc-entry {
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  margin-bottom: 0;
  transition:
    background 0.12s ease,
    color 0.12s ease;
}
.doc-entry:hover {
  background: var(--hover-bg);
}
.doc-entry.active {
  background: var(--toolbar-menu-selected-bg);
  color: var(--text1);
  box-shadow: none;
}
.doc-entry .lucide {
  width: 14px;
  height: 14px;
}
#doc-preview-toolbar {
  height: 34px;
  min-height: 34px;
  padding: 4px var(--space-2);
}
#doc-preview-toolbar .lucide {
  width: 16px;
  height: 16px;
}
.doc-toolbar-actions {
  gap: var(--space-1);
}
#doc-refresh-btn,
#doc-edit-btn {
  width: 26px;
  height: 26px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  font-size: 0;
}
#doc-refresh-btn:hover:not(:disabled),
#doc-edit-btn:hover:not(:disabled) {
  background: var(--hover-bg);
  border: 0;
}
#action-rail.collapsed {
  width: var(--rail-collapsed-width) !important;
  min-width: var(--rail-collapsed-width);
  max-width: var(--rail-collapsed-width);
}
#action-rail.collapsed #doc-browser {
  visibility: hidden;
  pointer-events: none;
}
#action-rail.collapsed #doc-rail-toggle {
  visibility: visible;
  pointer-events: auto;
  left: 5px;
}
#action-rail.collapsed > #doc-rail-edit-btn {
  visibility: visible;
  pointer-events: auto;
}

/* Workspace modes exchange the preview content and chat content below its header. */
#chat-content {
  --conversation-content-max-width: 810px;
  --conversation-inline-padding: clamp(16px, 2vw, 32px);
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}
#document-stage {
  display: none;
  min-width: 0;
  min-height: 0;
}
#main-shell[data-workspace-mode="document"] #document-stage {
  display: flex;
  flex: 1;
  flex-direction: column;
  background: var(--bg);
}
#main-shell[data-workspace-mode="document"] #document-stage #doc-preview-content {
  background: var(--bg);
}
#main-shell[data-workspace-mode="document"] #doc-preview-panel > #chat-content {
  flex: 1;
  min-height: 0;
}
#workspace-mode-control {
  position: absolute;
  left: 50%;
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transform: translateX(-50%);
}
#workspace-mode-control .workspace-mode-btn {
  min-width: 42px;
  height: 28px;
  padding: 0 var(--space-2);
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  font-size: 12px;
}
#workspace-mode-control .workspace-mode-btn + .workspace-mode-btn {
  border-left: 1px solid var(--border);
}
#workspace-mode-control .workspace-mode-btn:hover:not(.active) {
  background: var(--hover-bg);
}
#workspace-mode-control .workspace-mode-btn.active {
  color: var(--text1);
  font-weight: var(--weight-bold);
}

/* Popovers and dialogs */
/* Modals: in closed state, force position:static + display:none to guarantee
   no full-screen hit-testing layer can block underlying UI. */
#usage-modal,
#knowledge-modal,
#git-sync-modal,
#help-modal,
#compact-modal {
  position: static;
  display: none;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition:
    visibility 0s 0.2s,
    opacity 0.2s ease;
}
#usage-modal.open,
#knowledge-modal.open,
#git-sync-modal.open,
#help-modal.open,
#compact-modal.open {
  position: fixed;
  display: flex;
  inset: 0;
  z-index: 20;
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  background: rgba(15, 23, 42, 0.28);
  backdrop-filter: blur(5px);
  transition-delay: 0s;
}
#knowledge-modal.open,
#git-sync-modal.open,
#help-modal.open {
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}
#usage-panel,
#knowledge-panel,
#git-sync-panel,
#help-panel,
#compact-panel {
  border-radius: var(--radius-lg);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-lg);
  transform: translateY(8px) scale(0.985);
  transition: transform 0.2s cubic-bezier(0.2, 0.75, 0.3, 1);
}
#usage-modal.open #usage-panel,
#knowledge-modal.open #knowledge-panel,
#git-sync-modal.open #git-sync-panel,
#help-modal.open #help-panel,
#compact-modal.open #compact-panel {
  transform: none;
}
#usage-panel-header,
#knowledge-panel-header,
#git-sync-panel-header,
#help-panel-header,
#compact-panel-header {
  margin-bottom: var(--space-4);
}
#knowledge-panel,
#help-panel {
  width: min(800px, calc(100vw - 40px));
  max-height: min(720px, calc(100vh - 40px));
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--border);
}
#knowledge-panel-header,
#git-sync-panel-header,
#help-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: 0;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}
.modal-title-group {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: var(--space-3);
}
.modal-title-icon {
  width: 32px;
  height: 32px;
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: var(--accent);
}
.modal-title-icon .lucide {
  width: 18px;
  height: 18px;
}
#knowledge-panel-header strong,
#git-sync-panel-header strong,
#help-panel-header strong {
  overflow: hidden;
  color: var(--text1);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  text-overflow: ellipsis;
  white-space: nowrap;
}
#usage-close-btn,
#knowledge-close-btn,
#git-sync-close-btn,
#help-close-btn {
  border: 0;
  background: transparent;
}
#knowledge-close-btn,
#git-sync-close-btn,
#help-close-btn {
  width: 32px;
  height: 32px;
  color: var(--text2);
}
#knowledge-panel .panel-scroll-body {
  padding: var(--space-5);
}
#git-sync-panel {
  width: min(560px, calc(100vw - 40px));
  max-height: min(720px, calc(100vh - 40px));
  overflow: hidden;
  border: 1px solid var(--border);
}
#git-sync-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}
#git-sync-panel-header strong {
  color: var(--text1);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
}
#git-sync-close-btn {
  width: 32px;
  height: 32px;
  border: 0;
  color: var(--text2);
  background: transparent;
}
#git-sync-close-btn:hover {
  color: var(--danger);
  background: var(--danger-soft);
}
.git-sync-panel-body {
  padding: var(--space-5);
  overflow-y: auto;
}
.git-sync-status-card {
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
}
.git-sync-status-card + .git-sync-status-card { margin-top: var(--space-3); }
.git-sync-status-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  color: var(--muted);
  font-size: var(--text-xs);
}
.git-sync-status-row + .git-sync-status-row { margin-top: var(--space-2); }
.git-sync-status-row code,
.git-sync-state {
  overflow: hidden;
  color: var(--text1);
  font-size: var(--text-sm);
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.git-sync-status-row code,
.git-sync-hint code,
.git-sync-operation code {
  font-family: inherit;
  font-variant-numeric: tabular-nums;
}
.git-sync-state {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.git-sync-state::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  content: "";
}
.git-sync-state.warning::before { background: var(--token-warn-bg); }
.git-sync-section-title {
  margin: var(--space-6) 0 var(--space-2);
  color: var(--text1);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
}
.git-sync-hint {
  margin: 0;
  color: var(--muted);
  font-size: var(--text-xs);
  line-height: 1.6;
}
.git-sync-operations {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}
.git-sync-operation {
  min-height: 132px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--muted);
  background: var(--bg-surface);
  font-size: var(--text-xs);
  line-height: 1.55;
  text-align: left;
}
.git-sync-operation:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.git-sync-operation:disabled { cursor: not-allowed; opacity: 0.6; }
.git-sync-operation-head {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text1);
  font-size: var(--text-sm);
}
.git-sync-operation code {
  margin-top: auto;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--text2);
  background: var(--bg3);
  font-size: 12px;
  letter-spacing: 0.01em;
}
.git-sync-result {
  display: none;
  margin-top: var(--space-5);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}
.git-sync-result.show { display: block; }
.git-sync-result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  color: var(--text1);
  background: var(--bg-surface);
  font-size: var(--text-xs);
}
.git-sync-result.success { border-color: color-mix(in srgb, var(--success) 45%, var(--border)); }
.git-sync-result.success .git-sync-result-header { color: var(--success); background: var(--success-soft); }
.git-sync-result.error { border-color: color-mix(in srgb, var(--danger) 45%, var(--border)); }
.git-sync-result.error .git-sync-result-header { color: var(--danger); background: var(--danger-soft); }
.git-sync-result-header button {
  border: 0;
  border-radius: var(--radius-sm);
  color: inherit;
  background: transparent;
  font-size: 11px;
}
.git-sync-result-header button:hover { background: color-mix(in srgb, currentColor 10%, transparent); }
.git-sync-result pre {
  max-height: 160px;
  margin: 0;
  padding: var(--space-3);
  overflow: auto;
  color: var(--text2);
  background: var(--bg-surface);
  font-family: inherit;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  line-height: 1.55;
  white-space: pre-wrap;
}
.git-sync-manual-note {
  margin: var(--space-3) 0 0;
  color: var(--danger);
  font-size: var(--text-xs);
  line-height: 1.5;
}
@media (max-width: 520px) {
  .git-sync-operations { grid-template-columns: 1fr; }
}
#knowledge-list {
  gap: var(--space-3);
}
#usage-close-btn:hover,
#knowledge-close-btn:hover,
#help-close-btn:hover {
  background: var(--danger-soft);
}
.help-content {
  padding: var(--space-5) var(--space-6) var(--space-6);
  overflow-y: auto;
  color: var(--text2);
  font-size: var(--text-sm);
  line-height: 1.7;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.help-content::-webkit-scrollbar {
  width: 10px;
}
.help-content::-webkit-scrollbar-thumb {
  border: 3px solid var(--bg-elevated);
  border-radius: var(--radius-full);
  background: var(--border-strong);
}
.help-content h2 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-8) 0 var(--space-4);
  color: var(--text1);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.help-content h2:not(:first-child) {
  padding-top: var(--space-6);
  border-top: 1px solid var(--border);
}
.help-content h2::before {
  width: 4px;
  height: 18px;
  flex: 0 0 auto;
  border-radius: var(--radius-full);
  background: var(--accent);
  content: "";
}
.help-content h2:first-child {
  margin-top: 0;
}
.help-content h3 {
  margin: var(--space-5) 0 var(--space-2);
  padding-left: var(--space-3);
  color: var(--text1);
  font-size: 13px;
  font-weight: 650;
  border-left: 2px solid var(--border-strong);
}
.help-content p,
.help-content ol,
.help-content ul {
  margin: 0 0 var(--space-3);
}
.help-content ol,
.help-content ul {
  padding-left: var(--space-5);
}
.help-content li::marker {
  color: var(--accent);
}
.help-content li + li {
  margin-top: var(--space-1);
}
.help-content strong {
  color: var(--text1);
  font-weight: var(--weight-semibold);
}
.help-content code {
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg4);
  color: var(--text1);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.9em;
}
#file-picker-popover,
#command-picker-popover,
#tool-permission-dialog {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(7px);
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transition:
    visibility 0s 0.16s,
    opacity 0.16s ease,
    transform 0.16s ease;
}
#file-picker-popover.open,
#command-picker-popover.open,
#tool-permission-dialog.open {
  display: flex;
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: none;
  transition-delay: 0s;
}
.file-picker-item,
.command-picker-item {
  border: 0;
  margin: 0 var(--space-1);
  border-radius: var(--radius-sm);
}
.file-picker-item.focused,
.command-picker-item.focused {
  background: var(--hover-bg);
}
.usage-tab,
.usage-range-btn,
.usage-metric-toggle {
  border-radius: 4px;
}

#usage-modal.open {
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}
#usage-panel {
  width: min(1040px, calc(100vw - 40px));
  height: min(760px, calc(100vh - 40px));
  max-height: min(760px, calc(100vh - 40px));
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}
#usage-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: 0;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
  background: var(--bg-surface);
}
#usage-panel-header strong {
  overflow: hidden;
  color: var(--text1);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  text-overflow: ellipsis;
  white-space: nowrap;
}
.usage-header-actions,
#usage-tabs,
.usage-toolbar,
.usage-control-group {
  display: flex;
  align-items: center;
}
.usage-header-actions {
  flex: 0 0 auto;
  gap: var(--space-3);
}
#usage-tabs,
.usage-control-group {
  gap: var(--space-1);
}
.usage-tab,
.usage-range-btn,
.usage-metric-toggle {
  min-height: 28px;
  padding: 0 var(--space-3);
  border: 0;
  background: transparent;
  color: var(--text2);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  line-height: 1;
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease,
    box-shadow 0.15s ease;
}
.usage-tab:hover,
.usage-range-btn:hover,
.usage-metric-toggle:hover {
  color: var(--text1);
  background: var(--hover-bg);
}
.usage-tab.active,
.usage-range-btn.active,
.usage-metric-toggle.active {
  border-color: transparent;
  background: var(--accent);
  color: var(--accent-text);
  box-shadow: var(--shadow-sm);
}
#usage-close-btn {
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  border: 0;
  color: var(--text2);
}
.usage-panel-body {
  padding: var(--space-5) var(--space-6) var(--space-6);
}
.usage-toolbar {
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
}
.usage-empty-state {
  min-height: 260px;
  padding: var(--space-6) 0;
}
.usage-charts-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-5);
}
.usage-chart-section {
  min-width: 0;
}
.usage-chart-section + .usage-chart-section {
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
}
.chart-title {
  margin-bottom: var(--space-4);
  color: var(--text1);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
}
.usage-chart {
  height: 180px;
  padding: 0 var(--space-3);
}
.usage-chart-bar-segment {
  border-left: 1px solid color-mix(in srgb, var(--bg-elevated) 45%, transparent);
  border-right: 1px solid color-mix(in srgb, var(--bg-elevated) 45%, transparent);
}
.usage-legend {
  gap: var(--space-3);
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}
.usage-legend-item {
  gap: var(--space-2);
  color: var(--text2);
}
.usage-legend-swatch {
  width: 8px;
  height: 8px;
  border-radius: 2px;
}
#usage-total-tab {
  overflow-x: auto;
}
#usage-table {
  min-width: 720px;
  border-radius: var(--radius-md);
  background: var(--bg-elevated);
  box-shadow: none;
  font-variant-numeric: tabular-nums;
}
#usage-table th,
#usage-table td {
  padding: var(--space-3) var(--space-4);
}
#usage-table th {
  color: var(--muted);
  background: var(--bg-surface);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  white-space: nowrap;
}
#usage-table td {
  color: var(--text2);
}
#usage-table tbody tr:last-child td {
  border-bottom: 0;
}
#usage-table tbody tr:hover {
  background: var(--hover-bg);
}
#usage-table tfoot th,
#usage-table tfoot td {
  border-top: 1px solid var(--border-strong);
  background: transparent;
  color: var(--text1);
  font-weight: var(--weight-semibold);
}
#usage-table tfoot th {
  text-align: left;
  font-weight: var(--weight-bold);
}

/* Keep the statistics surface aligned with the khaki theme. */
html:not([data-theme]) #usage-panel,
html[data-theme="light"] #usage-panel,
html:not([data-theme]) #usage-table,
html[data-theme="light"] #usage-table {
  background: var(--bg-elevated);
}
html:not([data-theme]) #usage-table th,
html[data-theme="light"] #usage-table th {
  background: var(--bg4);
}
html:not([data-theme]) #usage-table tfoot th,
html[data-theme="light"] #usage-table tfoot th {
  background: transparent;
}

@media (max-width: 720px) {
  #usage-modal.open {
    padding: var(--space-3);
  }
  #usage-panel {
    width: min(100%, calc(100vw - 24px));
    height: calc(100vh - 24px);
    max-height: calc(100vh - 24px);
  }
  #usage-panel-header {
    padding: var(--space-3) var(--space-4);
  }
  .usage-panel-body {
    padding: var(--space-4);
  }
  .usage-tab,
  .usage-range-btn,
  .usage-metric-toggle {
    padding-inline: var(--space-2);
  }
}

.knowledge-card {
  background: var(--bg-surface);
  box-shadow: var(--shadow-sm);
}

@media (max-width: 980px) {
  #composer-toolbar {
    align-items: flex-end;
  }
  .composer-right {
    flex: 1;
    justify-content: flex-end;
    flex-wrap: wrap;
  }
  .toolbar-select {
    min-width: 78px;
    max-width: 120px;
  }
}

@media (max-width: 800px) {
  #sidebar:not(.collapsed) {
    width: 164px;
    min-width: 164px;
    flex-basis: 164px;
  }
  #chat-header {
    padding-inline: var(--space-3);
  }
  #chat-meta {
    max-width: calc(50% - 62px);
  }
  #chat-actions {
    gap: 4px;
  }
  .header-icon-btn {
    width: 30px;
    height: 30px;
  }
  .toolbar-select {
    max-width: 96px;
  }
}

@media (max-width: 360px) {
  #chat-meta {
    max-width: calc(50% - 55px);
  }
  #chat-actions {
    gap: 2px;
  }
  .header-icon-btn {
    width: 28px;
    height: 28px;
  }
  #workspace-mode-control .workspace-mode-btn {
    min-width: 40px;
    padding-inline: 7px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}