:root {
  color-scheme: light;
  --bg: #fbfcff;
  --panel: #ffffff;
  --panel-2: #f6f8fb;
  --sidebar-bg: rgba(255, 255, 255, 0.84);
  --button-bg: #ffffff;
  --user-panel: #f4f8ff;
  --user-line: #dce8fa;
  --line: #e5e8ee;
  --line-strong: #c7d0dc;
  --active-line: #b9d8c7;
  --text: #202124;
  --muted: #747985;
  --snippet: #384457;
  --mark-bg: #fff0a6;
  --soft: #eef4f0;
  --brand: #305fdd;
  --brand-dark: #1c45b7;
  --brand-soft: #eef4ff;
  --brand-line: #b8c9ff;
  --accent: #d7653d;
  --danger: #b3261e;
  --danger-soft: #fff5f3;
  --danger-line: #e5b3af;
  --warn-soft: #fff8ed;
  --warn-line: #e0c6a5;
  --warn-text: #7b4f16;
  --code-bg: #101820;
  --code-line: #253041;
  --code-header: #172232;
  --code-muted: #aeb9c8;
  --code-button: #1f2d3f;
  --code-button-hover: #26364b;
  --code-button-line: #3d4d63;
  --composer-drag: #fbfffd;
  --preview-image-bg: #ffffff;
  --shadow: 0 18px 55px rgba(38, 53, 84, 0.1);
  --composer-shadow: 0 22px 70px rgba(46, 65, 102, 0.16);
  --card-shadow: none;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101318;
  --panel: #171b22;
  --panel-2: #202733;
  --sidebar-bg: #12161d;
  --button-bg: #1d232c;
  --user-panel: #151a21;
  --user-line: #303a47;
  --line: #303a47;
  --line-strong: #465465;
  --active-line: #2e7650;
  --text: #edf2f7;
  --muted: #9ba8ba;
  --snippet: #c0cad8;
  --mark-bg: #665815;
  --soft: #182b22;
  --brand: #48b274;
  --brand-dark: #77d09a;
  --brand-soft: #163323;
  --brand-line: #2e7650;
  --accent: #8fb6ff;
  --danger: #ff9a90;
  --danger-soft: #3a1d1c;
  --danger-line: #6c3431;
  --warn-soft: #342617;
  --warn-line: #70512d;
  --warn-text: #f1c983;
  --code-bg: #0b111a;
  --code-line: #253041;
  --code-header: #111a27;
  --code-muted: #aeb9c8;
  --code-button: #1c2a3a;
  --code-button-hover: #26364b;
  --code-button-line: #3d4d63;
  --composer-drag: #16251d;
  --preview-image-bg: #0f1722;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.32);
  --card-shadow: 0 8px 26px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(circle at 66% 43%, rgba(133, 196, 255, 0.3), transparent 28%),
    radial-gradient(circle at 43% 70%, rgba(255, 230, 195, 0.22), transparent 24%);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button,
input,
textarea,
select {
  font: inherit;
  min-width: 0;
}

button {
  border: 0;
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
}

.app-loading {
  display: grid;
  min-height: 100vh;
  place-items: center;
  color: var(--muted);
  font-size: 15px;
  font-weight: 720;
}

.layout {
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  min-height: 100vh;
}

.layout.sidebar-collapsed {
  grid-template-columns: 64px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-height: 100vh;
  min-height: 0;
  overflow: hidden;
  border-right: 1px solid rgba(225, 229, 236, 0.78);
  background: var(--sidebar-bg);
  backdrop-filter: blur(10px);
}

.sidebar-header {
  padding: 18px 14px 14px;
  border-bottom: 1px solid rgba(225, 229, 236, 0.68);
}

.brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.brand-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.brand-title {
  margin: 0;
  font-size: 19px;
  font-weight: 820;
  letter-spacing: 0;
}

.sidebar-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 13px;
  font-weight: 750;
}

.sidebar-toggle:hover {
  border-color: var(--line-strong);
  color: var(--text);
}

.layout.sidebar-collapsed .sidebar {
  overflow: hidden;
}

.layout.sidebar-collapsed .sidebar-header {
  padding: 14px 10px;
}

.layout.sidebar-collapsed .brand-row {
  justify-content: center;
}

.layout.sidebar-collapsed .brand-title,
.layout.sidebar-collapsed #newConversationBtn,
.layout.sidebar-collapsed .student-meta,
.layout.sidebar-collapsed .quota-meter,
.layout.sidebar-collapsed .sidebar-model-select,
.layout.sidebar-collapsed .sidebar-search,
.layout.sidebar-collapsed .conversation-find,
.layout.sidebar-collapsed .saved-messages-toggle,
.layout.sidebar-collapsed .archive-conversations-toggle,
.layout.sidebar-collapsed .study-memory-toggle,
.layout.sidebar-collapsed .message-outline,
.layout.sidebar-collapsed .conversation-list,
.layout.sidebar-collapsed .sidebar-footer {
  display: none;
}

.layout.sidebar-collapsed .sidebar-toggle {
  width: 44px;
  padding: 0;
}

.student-meta {
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.quota-meter {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  margin-top: 8px;
  padding: 0 9px;
  border: 1px solid var(--brand-line);
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 780;
}

.quota-inline {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
  white-space: nowrap;
}

.quota-empty {
  border-color: var(--danger-line);
  background: var(--danger-soft);
  color: var(--danger);
}

.quota-inline.quota-empty {
  background: transparent;
}

.redeem-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px;
  margin-top: 8px;
}

.redeem-form .btn {
  min-height: 36px;
  padding: 0 10px;
  white-space: nowrap;
}

.sidebar-model-select {
  width: 100%;
  margin-top: 12px;
}

.sidebar-search {
  margin-top: 10px;
}

.conversation-find {
  display: grid;
  gap: 7px;
  margin-top: 10px;
}

.conversation-find-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) auto;
  align-items: center;
  gap: 6px;
}

.conversation-find-button {
  min-height: 28px;
  padding: 0 7px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  white-space: nowrap;
}

.conversation-find-button:hover:not(:disabled) {
  border-color: var(--line-strong);
  color: var(--text);
}

.conversation-find-button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}

.conversation-find-count {
  min-width: 34px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-align: right;
}

.saved-messages-toggle,
.archive-conversations-toggle,
.study-memory-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 32px;
  margin-top: 10px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.saved-messages-toggle:hover,
.saved-messages-toggle.active,
.archive-conversations-toggle:hover,
.archive-conversations-toggle.active,
.study-memory-toggle:hover,
.study-memory-toggle.active {
  border-color: #d6a11d;
  color: var(--warn-text);
  background: var(--warn-soft);
}

.message-outline {
  display: grid;
  gap: 6px;
  max-height: 260px;
  overflow-y: auto;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.message-outline-title {
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
}

.message-outline-list {
  display: grid;
  gap: 6px;
}

.message-outline-item {
  display: grid;
  gap: 3px;
  width: 100%;
  padding: 7px 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--button-bg);
  color: var(--text);
  text-align: left;
}

.message-outline-item:hover {
  border-color: var(--active-line);
  background: var(--soft);
}

.message-outline-item.saved {
  border-left-color: #d6a11d;
  border-left-width: 3px;
}

.message-outline-meta,
.message-outline-snippet {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message-outline-meta {
  color: var(--muted);
  font-size: 11px;
  font-weight: 750;
}

.message-outline-snippet {
  font-size: 12px;
  font-weight: 650;
}

.conversation-list {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 6px;
  overflow: auto;
  padding: 12px 10px;
}

.conversation-item {
  position: relative;
  display: grid;
  grid-template-rows: auto auto;
  width: 100%;
  min-height: 44px;
  flex: 0 0 auto;
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text);
}

.conversation-item:hover {
  z-index: 1;
  background: rgba(239, 242, 247, 0.86);
}

.conversation-item.active {
  z-index: 1;
  border-color: transparent;
  background: rgba(232, 237, 246, 0.94);
}

.conversation-item.pinned {
  border-left-color: var(--accent);
  border-left-width: 3px;
}

.conversation-item.archived {
  border-left-color: var(--line-strong);
  border-left-width: 3px;
}

.conversation-main {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  padding: 10px 10px 6px;
  background: transparent;
  color: inherit;
  text-align: left;
}

.conversation-title {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 650;
}

.conversation-actions {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 0 10px 8px;
}

.conversation-action {
  position: relative;
  z-index: 3;
  flex: 0 0 auto;
  min-height: 24px;
  padding: 0 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.conversation-action:hover {
  border-color: var(--line-strong);
  color: var(--text);
}

.conversation-action:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.conversation-action.danger {
  border-color: var(--danger-line);
  color: var(--danger);
}

.conversation-date {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.message-result-list {
  display: grid;
  gap: 6px;
  padding-top: 4px;
}

.saved-review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 2px 2px 4px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
}

.saved-review-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.study-memory-panel {
  display: grid;
  gap: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.study-memory-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  color: var(--text);
  font-size: 13px;
  font-weight: 780;
}

.study-memory-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
}

.study-memory-meta,
.study-memory-empty {
  color: var(--muted);
  font-size: 12px;
}

.study-memory-section {
  display: grid;
  gap: 6px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.study-memory-section-title {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
}

.study-memory-profile,
.study-memory-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.study-memory-profile span,
.study-memory-topic {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 26px;
  padding: 0 8px;
  border: 1px solid var(--active-line);
  border-radius: 7px;
  background: var(--soft);
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 700;
}

.study-memory-topic b {
  margin-left: 5px;
  color: var(--text);
}

.study-memory-questions {
  display: grid;
  gap: 5px;
  margin: 0;
  padding-left: 18px;
  color: var(--snippet);
  font-size: 12px;
  line-height: 1.5;
}

.study-memory-questions li {
  overflow-wrap: anywhere;
}

.message-result {
  display: grid;
  gap: 4px;
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--button-bg);
  color: var(--text);
  text-align: left;
}

.message-result:hover,
.message-result.active {
  border-color: var(--active-line);
  background: var(--soft);
}

.message-result-title,
.message-result-meta,
.message-result-snippet {
  min-width: 0;
  overflow: hidden;
}

.message-result-title {
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 750;
}

.message-result-meta {
  color: var(--muted);
  font-size: 12px;
}

.message-result-snippet {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  color: var(--snippet);
  font-size: 12px;
  line-height: 1.5;
}

.message-result mark {
  border-radius: 4px;
  background: var(--mark-bg);
  color: inherit;
}

.sidebar-footer {
  display: grid;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--line);
}

.sidebar-tool-group {
  display: grid;
  gap: 7px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.sidebar-tool-group summary {
  display: flex;
  align-items: center;
  min-height: 24px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 780;
  list-style: none;
  cursor: pointer;
}

.sidebar-tool-group summary::-webkit-details-marker {
  display: none;
}

.sidebar-tool-group summary::before {
  content: '▾';
  width: 16px;
  color: var(--muted);
  font-size: 11px;
}

.sidebar-tool-group:not([open]) summary::before {
  content: '▸';
}

.sidebar-tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
}

.sidebar-tool-grid .btn {
  flex: 1 1 calc(33.333% - 6px);
  min-width: 76px;
  padding: 0 9px;
  font-size: 13px;
}

.main {
  display: block;
  min-width: 0;
  min-height: 100vh;
}

.main.chat-empty {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  min-height: 100vh;
}

.chat-topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 560px);
  align-items: center;
  gap: 16px;
  min-height: 60px;
  padding: 10px clamp(16px, 6vw, 88px);
  border-bottom: 1px solid rgba(225, 229, 236, 0.58);
  background: rgba(255, 255, 255, 0.68);
  backdrop-filter: blur(10px);
}

.chat-topbar-title {
  min-width: 0;
  overflow: hidden;
  color: var(--text);
  font-size: 16px;
  font-weight: 780;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-topbar-controls {
  display: grid;
  grid-template-columns: auto minmax(180px, 320px);
  align-items: center;
  justify-content: end;
  gap: 10px;
  min-width: 0;
}

.chat-topbar-actions {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.main.chat-empty .chat-topbar-actions {
  display: none;
}

.main.chat-empty .chat-topbar-controls {
  grid-template-columns: minmax(180px, 320px);
}

.topbar-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  min-width: 42px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}

.topbar-action:hover:not(:disabled) {
  border-color: var(--line-strong);
  color: var(--text);
}

.topbar-action:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}

.topbar-model-select {
  justify-self: end;
}

.model-select {
  width: 100%;
  max-width: 100%;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  text-overflow: ellipsis;
}

.messages {
  min-height: calc(100vh - 170px);
  overflow: visible;
  padding: 20px clamp(16px, 6vw, 88px) 24px;
}

.main.chat-empty .messages {
  display: grid;
  place-items: end center;
  min-height: min(42vh, 420px);
  padding-top: clamp(76px, 16vh, 170px);
  padding-bottom: 22px;
}

.scroll-bottom {
  position: fixed;
  right: 24px;
  bottom: 132px;
  z-index: 20;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow);
  font-size: 13px;
  font-weight: 700;
}

.scroll-bottom:hover {
  border-color: var(--line-strong);
}

.undo-toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  max-width: min(520px, calc(100vw - 32px));
  min-height: 42px;
  padding: 8px 10px 8px 14px;
  border: 1px solid var(--code-line);
  border-radius: 8px;
  background: var(--code-header);
  color: var(--code-text, #eef5ff);
  box-shadow: 0 18px 54px rgba(24, 32, 42, 0.22);
  transform: translateX(-50%);
  font-size: 13px;
  font-weight: 650;
}

.undo-toast span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.undo-toast-action {
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid #4c6380;
  border-radius: 7px;
  background: #233148;
  color: #fff;
  font-size: 13px;
  font-weight: 750;
}

.undo-toast-action:hover {
  background: #2d3d58;
}

.app-toast {
  position: fixed;
  left: 50%;
  bottom: 78px;
  z-index: 72;
  display: inline-flex;
  align-items: center;
  max-width: min(520px, calc(100vw - 32px));
  min-height: 38px;
  padding: 8px 14px;
  border: 1px solid var(--code-line);
  border-radius: 8px;
  background: var(--code-header);
  color: var(--code-text, #eef5ff);
  box-shadow: 0 16px 46px rgba(24, 32, 42, 0.2);
  transform: translateX(-50%);
  font-size: 13px;
  font-weight: 700;
}

.app-toast.error {
  border-color: var(--danger-line);
  background: #3a1d1c;
  color: #ffe7e4;
}

.command-palette {
  position: fixed;
  inset: 0;
  z-index: 86;
  display: grid;
  place-items: start center;
  padding: min(12vh, 96px) 16px 24px;
}

.command-palette-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(14, 22, 34, 0.38);
}

.command-palette-panel {
  position: relative;
  display: grid;
  gap: 8px;
  width: min(680px, 100%);
  max-height: min(70vh, 620px);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 26px 80px rgba(20, 30, 42, 0.28);
}

.command-palette-input {
  width: 100%;
  height: 48px;
  padding: 0 16px;
  border: 0;
  border-bottom: 1px solid var(--line);
  outline: none;
  background: var(--panel);
  color: var(--text);
  font-size: 16px;
  font-weight: 700;
}

.command-palette-list {
  display: grid;
  gap: 5px;
  max-height: calc(min(70vh, 620px) - 57px);
  overflow-y: auto;
  padding: 8px;
}

.command-palette-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 54px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  text-align: left;
}

.command-palette-item:hover:not(:disabled),
.command-palette-item.active:not(:disabled) {
  border-color: var(--brand-line);
  background: var(--brand-soft);
}

.command-palette-item:disabled {
  cursor: not-allowed;
  opacity: 0.46;
}

.command-palette-main {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.command-palette-main b,
.command-palette-main small {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.command-palette-main b {
  font-size: 14px;
  font-weight: 820;
}

.command-palette-main small {
  color: var(--muted);
  font-size: 12px;
}

.command-palette-item kbd {
  min-width: 38px;
  padding: 3px 7px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  text-align: center;
}

.command-palette-empty {
  padding: 18px 10px;
  color: var(--muted);
  font-size: 13px;
}

.empty-state {
  display: grid;
  justify-items: center;
  gap: 10px;
  width: min(780px, 100%);
  margin: 0 auto;
  padding: 0 16px;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  text-align: center;
}

.empty-brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2f6df3, #e56c43);
  color: #fff;
  box-shadow: 0 14px 34px rgba(64, 95, 160, 0.18);
  font-size: 18px;
  font-weight: 850;
}

.empty-state h2 {
  margin: 0;
  color: #2c2f36;
  font-size: clamp(32px, 4vw, 46px);
  font-weight: 520;
  letter-spacing: 0;
}

[data-theme="dark"] .empty-state h2 {
  color: var(--text);
}

.empty-state p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.message {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
  max-width: 1020px;
  margin: 0 auto 24px;
}

.message-role {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  line-height: 32px;
  text-align: right;
}

.message-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  box-shadow: var(--card-shadow);
}

.message.user .message-card {
  border-color: var(--user-line);
  background: var(--user-panel);
  box-shadow: 0 10px 30px rgba(50, 76, 120, 0.05);
}

.message.saved .message-card {
  border-left-color: #d6a11d;
  border-left-width: 4px;
}

.answer-section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding: 12px 18px 0;
}

.answer-section-link {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 28px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.answer-section-link.level-2 {
  border-color: var(--active-line);
  color: var(--brand-dark);
}

.answer-section-link:hover {
  border-color: var(--line-strong);
  color: var(--text);
}

.answer-section-heading {
  scroll-margin-top: 18px;
}

.answer-section-heading.answer-section-active {
  border-radius: 6px;
  background: var(--brand-soft);
  box-shadow: 0 0 0 4px var(--brand-soft);
}

.message-content {
  position: relative;
  padding: 14px 18px;
  line-height: 1.74;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.message.user .message-content {
  padding: 14px 16px;
}

.message.assistant .message-content {
  padding-top: 8px;
}

.message.message-collapsed .message-content {
  max-height: 280px;
  overflow: hidden;
}

.message.message-collapsed .message-content::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 76px;
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0), var(--panel));
}

[data-theme="dark"] .message.message-collapsed .message-content::after {
  background: linear-gradient(to bottom, rgba(19, 25, 34, 0), var(--panel));
}

.message-content.streaming {
  min-height: 18px;
}

.message-meta {
  padding: 0 18px 10px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.message-content + .message-meta {
  margin-top: -6px;
}

.message-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 0 18px 14px;
}

.message-quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  justify-content: flex-end;
  padding: 8px 18px 0;
}

.message-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  min-width: 38px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
}

.message-action.compact {
  min-height: 27px;
  min-width: 0;
  padding: 0 8px;
}

.message-action:hover:not(:disabled) {
  border-color: var(--line-strong);
  color: var(--text);
}

.message-action.primary {
  border-color: var(--brand-line);
  background: var(--brand);
  color: #fff;
}

.message-action.primary:hover:not(:disabled) {
  border-color: var(--brand-dark);
  color: #fff;
  background: var(--brand-dark);
}

.message-action.error {
  border-color: var(--danger-line);
  background: var(--danger-soft);
  color: var(--danger);
}

.message-action.feedback.active {
  border-color: var(--brand-line);
  background: var(--brand-soft);
  color: var(--brand-dark);
}

.message-action.feedback[data-feedback-value="down"].active {
  border-color: var(--warn-line);
  background: var(--warn-soft);
  color: var(--warn-text);
}

.message-action.saved.active {
  border-color: #d6a11d;
  background: var(--warn-soft);
  color: var(--warn-text);
}

.message-action:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.message-more {
  display: inline-flex;
  min-width: 0;
}

.message-more[open] {
  display: flex;
  flex-basis: 100%;
  flex-wrap: wrap;
  gap: 8px;
}

.message-more-summary {
  list-style: none;
}

.message-more-summary::-webkit-details-marker {
  display: none;
}

.message-more-summary::after {
  content: "";
  width: 0;
  height: 0;
  margin-left: 5px;
  border-top: 4px solid currentColor;
  border-right: 4px solid transparent;
  border-left: 4px solid transparent;
  opacity: 0.62;
}

.message-more[open] .message-more-summary::after {
  transform: rotate(180deg);
}

.message-more-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  width: 100%;
  padding-top: 2px;
}

.follow-up-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 18px 12px;
}

.follow-up-suggestion {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--active-line);
  border-radius: 999px;
  background: var(--soft);
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}

.follow-up-suggestion:hover:not(:disabled) {
  border-color: var(--brand-line);
  background: var(--brand-soft);
  color: var(--text);
}

.selection-toolbar {
  position: fixed;
  z-index: 70;
  display: inline-flex;
  gap: 6px;
  max-width: calc(100vw - 24px);
  padding: 5px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 32px rgba(24, 32, 42, 0.16);
  transform: translate(-50%, -100%);
}

.selection-toolbar.below {
  transform: translate(-50%, 0);
}

.selection-toolbar-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  min-width: 46px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}

.selection-toolbar-button:hover {
  border-color: var(--line-strong);
  color: var(--text);
}

.selection-toolbar-button.primary {
  border-color: var(--brand-line);
  background: var(--brand);
  color: #fff;
}

.selection-toolbar-button.primary:hover {
  border-color: var(--brand-dark);
  background: var(--brand-dark);
  color: #fff;
}

.message-edit-panel {
  display: grid;
  gap: 10px;
}

.message-edit-input {
  width: 100%;
  min-height: 96px;
  max-height: 360px;
  resize: none;
  padding: 11px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  outline: none;
  background: var(--panel);
  color: var(--text);
  line-height: 1.65;
}

.message-edit-input:focus {
  border-color: #7aa892;
  box-shadow: 0 0 0 3px rgba(31, 122, 83, 0.12);
}

.message-edit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.message.retry-source .message-card {
  opacity: 0.58;
}

.message.message-highlight .message-card {
  animation: message-highlight 2.4s ease;
}

.message.message-find-hit .message-card {
  border-color: var(--active-line);
}

.message.message-find-active .message-card {
  border-color: #d6a11d;
  box-shadow: 0 0 0 4px rgba(214, 161, 29, 0.18), var(--card-shadow);
}

@keyframes message-highlight {
  0% {
    border-color: #d6a11d;
    box-shadow: 0 0 0 4px rgba(214, 161, 29, 0.18);
  }
  100% {
    border-color: var(--line);
    box-shadow: 0 4px 18px rgba(24, 32, 42, 0.04);
  }
}

.think-line {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px 0;
  color: var(--muted);
  font-size: 12px;
}

.think-badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 8px;
  border: 1px solid var(--brand-line);
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-weight: 750;
}

.think-text {
  overflow-wrap: anywhere;
}

.think-line.error .think-badge {
  border-color: var(--danger-line);
  background: var(--danger-soft);
  color: var(--danger);
}

.message-content p {
  margin: 0 0 0.85em;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.math-source {
  border-radius: 4px;
  cursor: copy;
  outline: 0;
  transition: background 0.15s ease, box-shadow 0.15s ease;
}

.math-source-display {
  display: block;
  overflow-x: auto;
  max-width: 100%;
}

.math-source mjx-container {
  pointer-events: none;
}

.math-source:hover,
.math-source:focus-visible {
  background: rgba(49, 90, 157, 0.08);
  box-shadow: 0 0 0 2px rgba(49, 90, 157, 0.08);
}

.math-source.copied {
  background: rgba(31, 122, 83, 0.12);
  box-shadow: 0 0 0 2px rgba(31, 122, 83, 0.14);
}

.math-source.copy-error {
  background: rgba(179, 38, 30, 0.1);
  box-shadow: 0 0 0 2px rgba(179, 38, 30, 0.13);
}

.message-content pre {
  overflow: auto;
  max-width: 100%;
  margin: 0;
  padding: 12px;
  border-radius: 8px;
  background: var(--code-bg);
  color: #eef5ff;
}

.code-block {
  overflow: hidden;
  margin: 0 0 0.85em;
  border: 1px solid var(--code-line);
  border-radius: 8px;
  background: var(--code-bg);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 34px;
  padding: 0 10px;
  border-bottom: 1px solid var(--code-line);
  background: var(--code-header);
  color: var(--code-muted);
  font-size: 12px;
}

.code-block-lang {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 700;
}

.code-copy-button {
  min-height: 24px;
  padding: 0 8px;
  border: 1px solid var(--code-button-line);
  border-radius: 7px;
  background: var(--code-button);
  color: #eef5ff;
  font-size: 12px;
  font-weight: 650;
}

.code-copy-button:hover:not(:disabled) {
  background: var(--code-button-hover);
}

.code-copy-button:disabled {
  cursor: not-allowed;
  opacity: 0.75;
}

.message-content code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.94em;
}

.message-content table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
}

.mjx-container {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  padding: 2px 0;
}

.message-images {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 18px 14px;
}

.image-thumb,
.attachment-thumb {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  padding: 0;
  border: 0;
  background: transparent;
}

.message-images img {
  max-width: 220px;
  max-height: 180px;
  border: 1px solid var(--line);
  border-radius: 8px;
  object-fit: contain;
  background: var(--preview-image-bg);
}

.image-thumb:hover img,
.attachment-thumb:hover img {
  border-color: var(--line-strong);
}

.image-preview {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 28px;
}

.image-preview-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(12, 18, 28, 0.68);
}

.image-preview-panel {
  position: relative;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  width: min(1120px, 96vw);
  max-height: min(86vh, 900px);
  overflow: hidden;
  border: 1px solid #2b3b52;
  border-radius: 8px;
  background: #0f1722;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
}

.image-preview-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 44px;
  padding: 0 12px;
  border-bottom: 1px solid #2b3b52;
  color: #edf4ff;
}

.image-preview-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 700;
}

.image-preview-close {
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid #485d78;
  border-radius: 7px;
  background: #1a2636;
  color: #edf4ff;
  font-size: 13px;
  font-weight: 700;
}

.image-preview-panel img {
  display: block;
  max-width: 100%;
  max-height: calc(min(86vh, 900px) - 45px);
  margin: auto;
  object-fit: contain;
  background: var(--preview-image-bg);
}

.composer {
  padding: 14px clamp(16px, 6vw, 88px) 18px;
  border-top: 1px solid rgba(225, 229, 236, 0.56);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(10px);
}

.main.chat-empty .composer {
  align-self: start;
  padding-top: 0;
  padding-bottom: clamp(44px, 10vh, 110px);
  border-top: 0;
  background: transparent;
  backdrop-filter: none;
}

.composer-inner {
  max-width: 960px;
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 30px rgba(38, 53, 84, 0.08);
  transition: border-color 0.12s ease, background 0.12s ease;
}

.main.chat-empty .composer-inner {
  max-width: 780px;
  border-color: rgba(197, 205, 217, 0.9);
  box-shadow: var(--composer-shadow);
}

.composer-inner:focus-within {
  border-color: rgba(48, 95, 221, 0.42);
  box-shadow: 0 18px 52px rgba(48, 95, 221, 0.12);
}

.composer-inner.drag-over {
  border-color: #1f7a53;
  background: var(--composer-drag);
  box-shadow: 0 0 0 3px rgba(31, 122, 83, 0.14);
}

.attachment-row {
  display: none;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 10px 0;
}

.attachment-row.visible {
  display: flex;
}

.attachment-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: min(100%, 300px);
  height: 46px;
  padding: 5px 6px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--muted);
  font-size: 12px;
}

.attachment-item img {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  object-fit: cover;
  background: var(--preview-image-bg);
}

.attachment-item span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.quick-prompts {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding: 10px 12px 0;
}

.quick-prompt {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  white-space: nowrap;
}

.quick-prompt:hover:not(:disabled) {
  border-color: var(--line-strong);
  color: var(--text);
}

.quick-prompt:disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.prompt-library {
  display: grid;
  gap: 10px;
  padding: 10px;
  border-top: 1px solid var(--line);
  background: rgba(246, 248, 251, 0.78);
}

.prompt-library-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--text);
  font-size: 13px;
  font-weight: 800;
}

.prompt-library-close,
.custom-prompt-delete {
  min-height: 28px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.prompt-library-close:hover,
.custom-prompt-delete:hover {
  border-color: var(--line-strong);
  color: var(--text);
}

.prompt-library-form {
  display: grid;
  grid-template-columns: minmax(120px, 180px) minmax(0, 1fr) auto;
  gap: 8px;
  align-items: stretch;
}

.prompt-library-name {
  height: 36px;
}

.prompt-library .prompt-library-text {
  min-height: 36px;
  max-height: 84px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  font-size: 13px;
  line-height: 1.5;
  resize: vertical;
}

.custom-prompt-list {
  display: grid;
  gap: 7px;
  max-height: 180px;
  overflow-y: auto;
}

.custom-prompt-empty {
  color: var(--muted);
  font-size: 13px;
}

.custom-prompt-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
}

.custom-prompt-main {
  display: grid;
  gap: 3px;
  min-width: 0;
  min-height: 44px;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--button-bg);
  color: var(--text);
  text-align: left;
}

.custom-prompt-main span,
.custom-prompt-main small {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.custom-prompt-main span {
  font-size: 13px;
  font-weight: 800;
}

.custom-prompt-main small {
  color: var(--muted);
  font-size: 12px;
}

.custom-prompt-main:hover {
  border-color: var(--brand-line);
  background: var(--brand-soft);
}

.slash-prompt-menu {
  display: grid;
  gap: 6px;
  max-height: 190px;
  overflow-y: auto;
  padding: 8px 10px 0;
  border-top: 1px solid var(--line);
}

.slash-prompt-item {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  width: 100%;
  min-height: 34px;
  padding: 6px 9px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--button-bg);
  color: var(--text);
  text-align: left;
}

.slash-prompt-item span {
  font-size: 12px;
  font-weight: 750;
  white-space: nowrap;
}

.slash-prompt-item small {
  min-width: 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.slash-prompt-item:hover,
.slash-prompt-item.active {
  border-color: var(--brand-line);
  background: var(--brand-soft);
}

.composer textarea {
  display: block;
  width: 100%;
  min-height: 92px;
  max-height: 240px;
  resize: none;
  padding: 16px 18px 12px;
  border: 0;
  outline: none;
  background: transparent;
  color: var(--text);
  overflow-y: hidden;
  font-size: 16px;
  line-height: 1.6;
}

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px 10px;
  border-top: 0;
  flex-wrap: wrap;
}

.left-actions,
.right-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  min-width: 0;
}

.right-actions {
  justify-content: flex-end;
  margin-left: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.86);
  color: var(--text);
  font-weight: 650;
  line-height: 1;
  white-space: nowrap;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--button-bg);
  color: var(--muted);
  font-size: 18px;
  line-height: 1;
}

.btn:hover {
  border-color: var(--line-strong);
}

.btn.primary {
  border-color: var(--brand);
  background: var(--brand);
  color: white;
}

.btn.primary:hover {
  background: var(--brand-dark);
}

.btn.ghost {
  background: transparent;
}

.btn.danger {
  border-color: var(--danger-line);
  color: var(--danger);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.login-page,
.admin-login {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(440px, 100%);
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.login-card h1 {
  margin: 0 0 8px;
  font-size: 22px;
  line-height: 1.25;
}

.login-card p {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.7;
}

.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 16px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-2);
}

.auth-tab {
  min-height: 34px;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-weight: 760;
}

.auth-tab.active {
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--card-shadow);
}

.code-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
}

.form-field {
  display: grid;
  gap: 6px;
  margin-bottom: 12px;
}

.form-field label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.input,
.textarea,
.select {
  width: 100%;
  min-height: 38px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
}

.textarea {
  min-height: 88px;
  resize: vertical;
}

.status {
  min-height: 20px;
  color: var(--muted);
  font-size: 13px;
  overflow-wrap: anywhere;
}

.status.error {
  color: var(--danger);
}

.admin-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100vh;
}

.admin-nav {
  border-right: 1px solid var(--line);
  background: var(--sidebar-bg);
  padding: 18px 14px;
}

.admin-nav h1 {
  margin: 0 0 18px;
  font-size: 18px;
}

.admin-content {
  padding: 24px;
  overflow: auto;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.stat-card,
.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--card-shadow);
}

.stat-card {
  padding: 14px;
}

.stat-value {
  font-size: 24px;
  font-weight: 780;
}

.stat-label {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.panel {
  margin-bottom: 18px;
  padding: 16px;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 17px;
}

.provider-table,
.student-table,
.feedback-table {
  width: 100%;
  border-collapse: collapse;
}

.provider-table th,
.provider-table td,
.student-table th,
.student-table td,
.feedback-table th,
.feedback-table td {
  padding: 10px 8px;
  border-top: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 13px;
}

.provider-table th,
.student-table th,
.feedback-table th {
  color: var(--muted);
  font-weight: 750;
}

.feedback-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border: 1px solid var(--brand-line);
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: 12px;
  font-weight: 750;
}

.feedback-badge.down {
  border-color: var(--warn-line);
  background: var(--warn-soft);
  color: var(--warn-text);
}

.feedback-excerpt {
  max-width: 640px;
  overflow-wrap: anywhere;
}

.provider-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.provider-form .wide {
  grid-column: 1 / -1;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.prompt-preview {
  max-height: 260px;
  overflow: auto;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--user-panel);
  color: var(--muted);
  white-space: pre-wrap;
  font-size: 12px;
  line-height: 1.55;
}

.hidden {
  display: none !important;
}

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

@media (max-width: 860px) {
  .layout,
  .admin-shell {
    grid-template-columns: 1fr;
  }

  .layout.sidebar-collapsed {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: sticky;
    top: 0;
    z-index: 70;
    height: auto;
    max-height: none;
    min-height: auto;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .sidebar-header {
    padding: 12px 14px;
  }

  .brand-title {
    font-size: 18px;
  }

  .layout.sidebar-collapsed .sidebar {
    min-height: auto;
  }

  .layout.sidebar-collapsed .sidebar-header {
    padding: 12px 14px;
  }

  .layout.sidebar-collapsed .brand-row {
    justify-content: space-between;
  }

    .layout.sidebar-collapsed .brand-title {
      display: block;
    }

    .layout.sidebar-collapsed .quota-meter {
      display: inline-flex;
    }

  .layout.sidebar-collapsed #newConversationBtn {
    display: inline-flex;
  }

  .layout.sidebar-collapsed .sidebar-toggle {
    width: auto;
    padding: 0 10px;
  }

  .conversation-list {
    max-height: 130px;
  }

  .chat-topbar {
    grid-template-columns: 1fr;
    gap: 8px;
    min-height: 88px;
    padding: 10px 16px;
  }

  .chat-topbar-controls {
    grid-template-columns: 1fr;
    justify-content: stretch;
    gap: 8px;
  }

  .chat-topbar-actions {
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .topbar-model-select {
    justify-self: stretch;
  }

  .main.chat-empty .chat-topbar {
    min-height: 56px;
  }

  .main.chat-empty .chat-topbar-title {
    display: none;
  }

  .main.chat-empty .messages {
    min-height: clamp(210px, 34vh, 320px);
    padding: 24px 18px 12px;
    place-items: center;
  }

  .empty-brand-mark {
    width: 38px;
    height: 38px;
    font-size: 16px;
  }

  .empty-state h2 {
    font-size: 31px;
    line-height: 1.18;
  }

  .empty-state p {
    font-size: 14px;
  }

  .message {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .message-role {
    text-align: left;
  }

  .composer-actions {
    align-items: stretch;
  }

  .main.chat-empty .composer {
    padding: 0 22px 30px;
  }

  .composer {
    padding: 12px 14px 16px;
  }

  .composer-inner {
    border-radius: 22px;
  }

  .composer textarea {
    min-height: 82px;
    padding: 14px 16px 10px;
  }

  .quick-prompts {
    gap: 6px;
  }

  .quick-prompt {
    min-height: 27px;
    padding: 0 8px;
  }

  .slash-prompt-item {
    grid-template-columns: 76px minmax(0, 1fr);
  }

  .prompt-library-form {
    grid-template-columns: 1fr;
  }

  .custom-prompt-item {
    grid-template-columns: 1fr;
  }

  .scroll-bottom {
    right: 16px;
    bottom: 120px;
  }

  .left-actions,
  .right-actions {
    width: 100%;
  }

  .right-actions {
    margin-left: 0;
  }

  .right-actions .btn.primary {
    flex: 1;
  }

  .admin-grid,
  .provider-form {
    grid-template-columns: 1fr;
  }
}