:root {
  --brand: #2563eb;
  --brand-hover: #1d4ed8;
  --brand-soft: #eff4ff;
  --on-brand: #ffffff;
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #f8f9fb;
  --hover: #f1f3f6;
  --text: #1f2328;
  --text-2: #4b5563;
  --muted: #6b7280;
  --border: #e5e7eb;
  --grid: #eceef1;
  --rail-bg: #111827;
  --rail-text: #9ca3af;
  --rail-active: #ffffff;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --success: #16a34a;
  --warning: #d97706;
  --star: #f59e0b;
  --chart-bar: #2563eb;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
  --radius: 10px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --brand: #4f8ff7;
    --brand-hover: #6aa1f8;
    --brand-soft: #1b2a45;
    --on-brand: #ffffff;
    --bg: #111318;
    --surface: #1b1e24;
    --surface-2: #20242b;
    --hover: #252a32;
    --text: #e6e8eb;
    --text-2: #c2c7cf;
    --muted: #9aa1ab;
    --border: #2c3038;
    --grid: #2a2e35;
    --rail-bg: #0b0d11;
    --danger: #f87171;
    --danger-soft: #3a1d1f;
    --chart-bar: #4f8ff7;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}

:root[data-theme='dark'] {
  --brand: #4f8ff7;
  --brand-hover: #6aa1f8;
  --brand-soft: #1b2a45;
  --bg: #111318;
  --surface: #1b1e24;
  --surface-2: #20242b;
  --hover: #252a32;
  --text: #e6e8eb;
  --text-2: #c2c7cf;
  --muted: #9aa1ab;
  --border: #2c3038;
  --grid: #2a2e35;
  --rail-bg: #0b0d11;
  --danger: #f87171;
  --danger-soft: #3a1d1f;
  --chart-bar: #4f8ff7;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

#root {
  height: 100%;
}

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

a {
  color: var(--brand);
}

h1,
h2,
h3 {
  margin: 0;
}

[hidden] {
  display: none !important;
}

.boot {
  display: grid;
  place-items: center;
  height: 100%;
  color: var(--muted);
}

/* ---- buttons & controls ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
  text-decoration: none;
  font-size: 13px;
}

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

.btn:disabled {
  opacity: 0.55;
  cursor: default;
}

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

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

.btn-danger {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.btn-danger:hover {
  background: var(--danger);
  filter: brightness(0.95);
}

.btn-ghost,
.btn-ghost-danger {
  border-color: transparent;
  background: transparent;
}

.btn-ghost {
  color: var(--brand);
}

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

.btn-ghost-danger:hover {
  background: var(--danger-soft);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  flex: none;
}

.icon-btn:hover {
  background: var(--hover);
  color: var(--text);
}

.link-btn {
  border: 0;
  background: none;
  color: var(--brand);
  cursor: pointer;
  padding: 0;
  font-size: 13px;
}

input:not([type='checkbox']):not([type='radio']):not([type='color']),
select,
textarea {
  width: 100%;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  outline: none;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent);
}

input:disabled {
  background: var(--surface-2);
  color: var(--muted);
}

input[type='color'] {
  width: 56px;
  height: 34px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

textarea {
  resize: vertical;
}

.field {
  display: grid;
  gap: 4px;
}

.field-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
}

.field-hint {
  font-size: 12px;
  color: var(--muted);
}

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
}

.form {
  display: grid;
  gap: 14px;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.form-actions.start {
  justify-content: flex-start;
}

/* ---- small pieces ---- */

.avatar {
  position: relative;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  font-weight: 600;
  flex: none;
}

.avatar-presence {
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 30%;
  height: 30%;
  min-width: 8px;
  min-height: 8px;
  border-radius: 50%;
  background: #9ca3af;
  border: 2px solid var(--surface);
}

.avatar-presence.on {
  background: #22c55e;
}

.dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex: none;
}

.dot-online {
  background: #22c55e;
}

.dot-away {
  background: #f59e0b;
}

.dot-offline {
  background: #9ca3af;
}

.badge {
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 9px;
  background: #ef4444;
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  line-height: 18px;
  text-align: center;
  flex: none;
}

.chip {
  display: inline-block;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 20px;
  font-weight: 500;
  vertical-align: middle;
}

.chip-waiting {
  background: color-mix(in srgb, var(--warning) 15%, transparent);
  color: var(--warning);
}

.chip-active {
  background: color-mix(in srgb, var(--success) 15%, transparent);
  color: var(--success);
}

.chip-closed {
  background: var(--hover);
  color: var(--muted);
}

.stars {
  display: inline-flex;
  gap: 1px;
  vertical-align: -2px;
}

.star-on {
  color: var(--star);
  fill: var(--star);
}

.star-off {
  color: var(--border);
}

.empty {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  height: 100%;
  min-height: 160px;
  padding: 24px;
  color: var(--muted);
  text-align: center;
}

.empty p {
  margin: 0;
}

.loading {
  padding: 24px;
  text-align: center;
  color: var(--muted);
}

/* ---- login ---- */

.login {
  display: grid;
  place-items: center;
  min-height: 100%;
  padding: 16px;
}

.login-card {
  display: grid;
  gap: 14px;
  width: min(360px, 100%);
  padding: 32px 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.login-logo {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--brand);
  color: var(--on-brand);
}

.login-card h1 {
  font-size: 22px;
}

.login-sub {
  margin: -8px 0 4px;
  color: var(--muted);
}

.login-error {
  min-height: 20px;
  margin: 0;
  color: var(--danger);
  font-size: 13px;
}

.login-card .btn {
  height: 38px;
}

/* ---- app layout ---- */

.app {
  display: grid;
  grid-template-columns: 72px 1fr;
  height: 100%;
}

.rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 14px 0;
  background: var(--rail-bg);
  color: var(--rail-text);
}

.rail-logo {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 8px;
  border-radius: 12px;
  background: var(--brand);
  color: #fff;
}

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
  width: 100%;
  padding: 0 8px;
}

.rail-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 0;
  border-radius: 10px;
  color: inherit;
  font-size: 11px;
  text-decoration: none;
}

.rail-item:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #e5e7eb;
}

.rail-item.active {
  background: rgba(255, 255, 255, 0.1);
  color: var(--rail-active);
}

.rail-badge {
  position: absolute;
  top: 2px;
  right: 6px;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: 9px;
  background: #ef4444;
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  line-height: 18px;
  text-align: center;
}

.rail-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.rail-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  font-size: 11px;
  cursor: pointer;
}

.rail-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  color: #e5e7eb;
}

.main-wrap {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.conn-banner {
  padding: 6px 16px;
  background: var(--warning);
  color: #fff;
  font-size: 13px;
  text-align: center;
}

.main {
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

/* ---- popover / menu ---- */

.popover {
  position: fixed;
  z-index: 50;
  min-width: 200px;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.menu {
  display: grid;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  text-align: left;
  cursor: pointer;
  color: var(--text);
}

.menu-item:hover {
  background: var(--hover);
}

.menu-item.active {
  background: var(--brand-soft);
}

.menu-item.danger {
  color: var(--danger);
}

.menu-sep {
  height: 1px;
  margin: 4px 0;
  background: var(--border);
}

/* ---- modal ---- */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 16px;
  background: rgba(15, 23, 42, 0.45);
}

.modal {
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 32px);
  background: var(--surface);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px 6px 20px;
}

.modal-header h3 {
  font-size: 16px;
}

.modal-body {
  padding: 8px 20px 16px;
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}

.confirm-text {
  margin: 0;
  color: var(--text-2);
}

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

.pick-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}

.pick-item:has(input:checked) {
  border-color: var(--brand);
  background: var(--brand-soft);
}

.pick-main {
  display: grid;
}

.pick-name {
  font-weight: 500;
}

.pick-sub {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 12px;
}

/* ---- toast ---- */

.toast-host {
  position: fixed;
  top: 16px;
  left: 50%;
  z-index: 60;
  display: grid;
  gap: 8px;
  transform: translateX(-50%);
  width: max-content;
  max-width: calc(100vw - 32px);
}

.toast {
  padding: 9px 16px;
  border-radius: 10px;
  background: #1f2937;
  color: #fff;
  box-shadow: var(--shadow);
  font-size: 13px;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast-success {
  background: #15803d;
}

.toast-error {
  background: #b91c1c;
}

.toast.leaving {
  opacity: 0;
  transform: translateY(-6px);
}

/* ---- workspace ---- */

.workspace {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr) 300px;
  height: 100%;
}

.conv-column {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
}

.column-head {
  padding: 16px 16px 8px;
}

.column-head h2 {
  font-size: 17px;
}

.tabs {
  display: flex;
  gap: 2px;
  padding: 0 8px;
  border-bottom: 1px solid var(--border);
}

.tab {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 4px;
  white-space: nowrap;
  border: 0;
  border-bottom: 2px solid transparent;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
}

.tab.active {
  color: var(--text);
  border-bottom-color: var(--brand);
  font-weight: 600;
}

.tab-count {
  min-width: 20px;
  padding: 0 6px;
  border-radius: 10px;
  background: var(--hover);
  color: var(--muted);
  font-size: 11px;
  line-height: 18px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.tab-count.alert {
  background: #ef4444;
  color: #fff;
}

.list-filter {
  padding: 8px 12px;
}

.list-filter:empty {
  display: none;
}

.list-filter.stack {
  display: grid;
  gap: 8px;
}

.search-box {
  position: relative;
}

.search-box .icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
}

.search-box input {
  padding-left: 32px !important;
}

.conv-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px 8px;
}

.conv-item {
  display: flex;
  gap: 10px;
  width: 100%;
  padding: 10px 8px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.conv-item:hover {
  background: var(--hover);
}

.conv-item.selected {
  background: var(--brand-soft);
}

.conv-main {
  display: grid;
  gap: 1px;
  flex: 1;
  min-width: 0;
}

.conv-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
}

.conv-name {
  min-width: 0;
  overflow: hidden;
  font-weight: 500;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.conv-item.unread .conv-name {
  font-weight: 700;
}

.conv-time {
  flex: none;
  color: var(--muted);
  font-size: 12px;
}

.conv-preview {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.conv-meta {
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.load-more {
  display: block;
  margin: 8px auto;
  padding: 4px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
}

.panel-column {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--bg);
}

.chat-panel {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.back-btn,
.info-close {
  display: none;
}

.panel-title {
  flex: 1;
  min-width: 0;
}

.panel-name {
  overflow: hidden;
  font-weight: 600;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.panel-sub {
  color: var(--muted);
  font-size: 12px;
}

.panel-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.info-btn {
  display: none;
}

.message-list {
  flex: 1;
  overflow-y: auto;
  padding: 16px 20px;
}

.msg {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-top: 12px;
}

.msg.grouped {
  margin-top: 4px;
}

.msg.ours {
  align-items: flex-end;
}

.msg-meta {
  display: flex;
  gap: 8px;
  margin: 0 4px 3px;
  color: var(--muted);
  font-size: 12px;
}

.bubble {
  max-width: min(560px, 80%);
  padding: 8px 12px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.msg.ours .bubble {
  background: var(--brand);
  border-color: transparent;
  color: var(--on-brand);
}

.msg.ours .bubble a {
  color: inherit;
}

.bubble.image,
.msg.ours .bubble.image {
  display: block;
  padding: 4px;
  background: var(--surface);
  border-color: var(--border);
}

.bubble.image img {
  display: block;
  max-width: 260px;
  max-height: 260px;
  border-radius: 8px;
}

.sys-msg {
  margin: 14px 0 6px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

.sys-msg span {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--hover);
}

.typing-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 20px 6px;
  color: var(--muted);
  font-size: 12px;
}

.typing-dots {
  display: inline-flex;
  gap: 3px;
}

.typing-dots i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--muted);
  animation: blink 1.2s infinite ease-in-out;
}

.typing-dots i:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-dots i:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes blink {
  0%,
  80%,
  100% {
    opacity: 0.25;
  }
  40% {
    opacity: 1;
  }
}

.panel-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.footer-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 14px 16px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.composer {
  position: relative;
  display: grid;
  padding: 6px 12px 10px;
}

.composer-tools {
  display: flex;
  gap: 2px;
}

.composer textarea {
  border: 0;
  padding: 6px 4px;
  resize: none;
  background: transparent;
  box-shadow: none !important;
}

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.composer-hint {
  color: var(--muted);
  font-size: 12px;
}

.quick-panel {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: calc(100% + 6px);
  z-index: 5;
  max-height: 260px;
  overflow-y: auto;
  padding: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.quick-item {
  display: grid;
  gap: 2px;
  width: 100%;
  padding: 8px 10px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.quick-item:hover,
.quick-item.active {
  background: var(--hover);
}

.quick-item span {
  overflow: hidden;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

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

.info-column {
  min-height: 0;
  overflow-y: auto;
  background: var(--surface);
  border-left: 1px solid var(--border);
}

.visitor-panel {
  padding: 20px 16px;
}

.info-head {
  display: grid;
  justify-items: center;
  gap: 6px;
  padding-bottom: 16px;
  text-align: center;
}

.info-name {
  font-weight: 600;
  font-size: 15px;
}

.info-sub {
  color: var(--muted);
  font-size: 12px;
}

.info-section {
  display: grid;
  gap: 8px;
  padding: 14px 0;
  border-top: 1px solid var(--border);
}

.info-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 28px;
  color: var(--text-2);
  font-weight: 600;
  font-size: 13px;
}

.info-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: 8px;
  font-size: 13px;
}

.info-label {
  color: var(--muted);
}

.info-value {
  overflow-wrap: anywhere;
}

.info-value a {
  display: -webkit-box;
  overflow: hidden;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.pre {
  white-space: pre-wrap;
}

.info-form .form-actions {
  margin-top: 4px;
}

/* ---- pages (admin) ---- */

.page {
  height: 100%;
  overflow-y: auto;
}

.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 20px 24px 0;
}

.page-head h2 {
  font-size: 20px;
}

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

.page-body {
  display: grid;
  gap: 16px;
  padding: 16px 24px 32px;
  max-width: 1200px;
}

.page-tip {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.card {
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.card h3 {
  font-size: 15px;
}

.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.card-sub {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.segmented {
  display: inline-flex;
  justify-self: start;
  padding: 3px;
  border-radius: 10px;
  background: var(--hover);
}

.segmented button {
  padding: 5px 14px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 13px;
}

.segmented button.active {
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.dashboard {
  display: grid;
  gap: 12px;
  transition: opacity 0.15s ease;
}

.dashboard.refreshing {
  opacity: 0.55;
}

.section-title {
  margin-top: 8px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 600;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.stat {
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.stat-label {
  color: var(--muted);
  font-size: 13px;
}

.stat-value {
  margin-top: 4px;
  font-size: 26px;
  font-weight: 600;
  line-height: 1.2;
}

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

.chart {
  position: relative;
  width: 100%;
  min-height: 220px;
}

.chart svg {
  display: block;
  overflow: visible;
}

.chart .grid {
  stroke: var(--grid);
  stroke-width: 1;
}

.chart .axis {
  stroke: var(--border);
  stroke-width: 1;
}

.chart .tick {
  fill: var(--muted);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.chart .col {
  fill: var(--chart-bar);
}

.chart .hit {
  fill: transparent;
}

.chart .bar {
  outline: none;
  cursor: default;
}

.chart .bar:hover .hit,
.chart .bar:focus-visible .hit {
  fill: color-mix(in srgb, var(--chart-bar) 7%, transparent);
}

.chart .bar:hover .col,
.chart .bar:focus-visible .col {
  filter: brightness(1.12);
}

.chart-tip {
  position: absolute;
  display: grid;
  gap: 1px;
  padding: 6px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  pointer-events: none;
  white-space: nowrap;
  font-size: 12px;
}

.chart-tip strong {
  font-size: 13px;
  color: var(--text);
}

.chart-tip span {
  color: var(--muted);
}

.table-wrap {
  overflow-x: auto;
}

.card.table-wrap {
  padding: 4px 0;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.table th,
.table td {
  padding: 10px 14px;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

.table th {
  color: var(--muted);
  font-weight: 500;
}

.table tbody tr:last-child td {
  border-bottom: 0;
}

.table .num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.table.compact th,
.table.compact td {
  padding: 6px 10px;
}

.actions-col {
  text-align: right !important;
}

.muted-row td {
  color: var(--muted);
}

.cell-user {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.cell-user > span:last-child {
  display: grid;
}

.cell-strong {
  font-weight: 500;
  color: var(--text);
}

.cell-sub {
  color: var(--muted);
  font-size: 12px;
}

.cell-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.reply-list {
  display: grid;
  gap: 10px;
}

.reply-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.reply-main {
  flex: 1;
  min-width: 0;
}

.reply-title {
  font-weight: 600;
}

.reply-content {
  margin-top: 2px;
  color: var(--text-2);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.reply-actions {
  display: flex;
}

.settings-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 16px;
  align-items: start;
}

.settings-form h3 {
  margin-top: 6px;
}

.code {
  margin: 10px 0;
  padding: 12px;
  overflow-x: auto;
  border-radius: 8px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ---- AI ---- */

.ai-tag {
  display: inline-block;
  padding: 0 5px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--brand) 14%, transparent);
  color: var(--brand);
  font-size: 11px;
  font-weight: 600;
  line-height: 16px;
}

.chip-bot {
  background: color-mix(in srgb, var(--brand) 14%, transparent);
  color: var(--brand);
}

.msg.ours.bot .bubble {
  background: var(--brand-soft);
  border-color: color-mix(in srgb, var(--brand) 25%, transparent);
  color: var(--text);
}

.msg.ours.bot .bubble a {
  color: var(--brand);
}

.text-warn,
.field-hint.warn {
  color: var(--danger);
}

.text-ok {
  color: var(--success);
}

.settings-side {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.ai-connection h3 {
  font-size: 15px;
}

.ai-connection .page-tip {
  margin-top: -6px;
}

.ping-result {
  font-size: 13px;
  overflow-wrap: anywhere;
}

.ping-result:empty {
  display: none;
}

/* ---- knowledge base ---- */

.kb-status {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.kb-status-icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--brand-soft);
  color: var(--brand);
  flex: none;
}

.kb-facts {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 6px 16px;
  margin: 0;
  font-size: 13px;
}

.kb-facts dt {
  color: var(--muted);
}

.kb-facts dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.kb-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  align-items: start;
}

.kb-main {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.kb-toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
}

.kb-toolbar .search-box {
  flex: 1;
  max-width: 420px;
}

.kb-list {
  display: grid;
  gap: 10px;
}

.kb-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.kb-item.disabled {
  opacity: 0.6;
}

.kb-item-main {
  flex: 1;
  min-width: 0;
}

.kb-item-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.kb-item-content {
  display: -webkit-box;
  margin-top: 4px;
  overflow: hidden;
  color: var(--text-2);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

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

.kb-item-actions {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: none;
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-right: 6px;
  color: var(--muted);
  font-size: 12px;
  cursor: pointer;
}

.kb-try {
  position: sticky;
  top: 16px;
  display: grid;
  gap: 10px;
}

.try-output:empty {
  display: none;
}

.try-output {
  display: grid;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.try-label {
  color: var(--muted);
  font-size: 12px;
}

.try-hits {
  margin: 0;
  padding-left: 20px;
  font-size: 13px;
}

.try-answer {
  padding: 8px 12px;
  border-radius: 12px;
  background: var(--brand-soft);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.try-handoff {
  color: var(--warning);
  font-size: 13px;
}

.import-preview ol {
  max-height: 280px;
  margin: 8px 0 0;
  padding-left: 22px;
  overflow-y: auto;
}

/* ---- responsive ---- */

@media (max-width: 1200px) {
  .workspace {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  .info-btn {
    display: inline-grid;
  }

  .info-column {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    width: min(340px, 100vw);
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.2s ease, visibility 0.2s;
  }

  .info-column.open {
    transform: none;
    visibility: visible;
    box-shadow: var(--shadow);
  }

  .info-close {
    display: flex;
    justify-content: flex-end;
    padding: 8px 8px 0;
  }

  .settings-grid,
  .kb-grid {
    grid-template-columns: 1fr;
  }

  .kb-try {
    position: static;
  }
}

@media (max-width: 760px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 1fr) auto;
  }

  .rail {
    order: 2;
    flex-direction: row;
    gap: 0;
    padding: 4px 4px calc(4px + env(safe-area-inset-bottom));
  }

  .rail-logo {
    display: none;
  }

  .rail-nav {
    flex-direction: row;
    padding: 0;
  }

  .rail-item {
    flex: 1;
    min-width: 0;
    padding: 6px 0;
    font-size: 10px;
    white-space: nowrap;
  }

  .rail-badge {
    right: 2px;
  }

  .rail-bottom {
    flex-direction: row;
    gap: 2px;
  }

  .rail-btn {
    padding: 6px 4px;
  }

  .rail-btn > span:not(.dot):not(.avatar) {
    display: none;
  }

  .kb-item {
    flex-direction: column;
  }

  .main-wrap {
    order: 1;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .workspace .panel-column {
    display: none;
  }

  .workspace.has-selection .conv-column {
    display: none;
  }

  .workspace.has-selection .panel-column {
    display: flex;
  }

  .back-btn {
    display: inline-grid;
  }

  .panel-header {
    padding: 8px 10px;
    flex-wrap: wrap;
  }

  .panel-actions .btn span {
    display: none;
  }

  .message-list {
    padding: 12px;
  }

  .bubble {
    max-width: 88%;
  }

  .composer-hint {
    display: none;
  }

  .page-head,
  .page-body {
    padding-left: 16px;
    padding-right: 16px;
  }
}

@media (max-width: 440px) {
  /* Bottom navigation keeps icons only on narrow phones. */
  .rail-item > span:not(.rail-badge) {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .rail-item {
    padding: 10px 0;
  }
}