:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --bg-strong: #edf2f7;
  --panel: #ffffff;
  --panel-soft: #f9fbff;
  --panel-muted: #eef4ff;
  --text: #1f2a37;
  --muted: #7b8794;
  --line: #e5eaf1;
  --line-strong: #d7e0ea;
  --accent: #3a72d8;
  --accent-dark: #2f5fbb;
  --sidebar: #f7faff;
  --sidebar-strong: #eef4fb;
  --danger-bg: #fff1f2;
  --danger-text: #be123c;
  --shadow: 0 12px 32px rgba(31, 42, 55, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(180deg, #fbfcfe 0%, #f5f8fc 100%);
  color: var(--text);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.login-page,
.shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 16px;
}

.login-card,
.panel {
  width: min(100%, 420px);
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.25;
}

.muted {
  margin: 10px 0 24px;
  color: var(--muted);
  line-height: 1.7;
}

.alert {
  margin-bottom: 18px;
  padding: 12px 14px;
  border-radius: 8px;
  background: var(--danger-bg);
  color: var(--danger-text);
  font-size: 14px;
}

form {
  display: grid;
  gap: 12px;
}

label {
  color: #344054;
  font-size: 14px;
  font-weight: 600;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  font: inherit;
}

input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.14);
  outline: none;
}

.button {
  height: 44px;
  margin-top: 8px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.button:hover {
  background: var(--accent-dark);
}

.app-body {
  overflow: hidden;
}

.app-shell {
  display: grid;
  grid-template-rows: 60px minmax(0, 1fr);
  height: 100vh;
  min-height: 0;
  background: var(--bg);
}

.workspace {
  display: grid;
  grid-template-columns: 296px minmax(0, 1fr) 340px;
  min-height: 0;
  height: 100%;
  overflow: hidden;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 18px;
  min-height: 0;
  overflow-y: auto;
  background: linear-gradient(180deg, var(--sidebar) 0%, var(--sidebar-strong) 100%);
  border-right: 1px solid var(--line);
  transition: width 180ms ease, padding 180ms ease, transform 180ms ease;
}

.sidebar-top {
  display: grid;
  gap: 14px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-mark,
.avatar,
.message-avatar {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 11px;
  background: #e4edff;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

.brand-text {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 12px;
}

.icon-button {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #ffffff;
  cursor: pointer;
}

.icon-button span {
  width: 16px;
  height: 2px;
  margin-left: 11px;
  border-radius: 999px;
  background: #6b7785;
}

.new-chat,
.ghost-button,
.send-button,
.tool-chip {
  border: 0;
  border-radius: 12px;
  font: inherit;
  cursor: pointer;
}

.new-chat {
  height: 44px;
  width: 100%;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
}

.search-form input {
  width: 100%;
  height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
}

.sidebar-label {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

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

.history-item {
  display: grid;
  gap: 4px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--text);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.82);
}

.history-item.active,
.history-item:hover {
  border-color: #cfdcf6;
  background: #edf4ff;
}

.history-title {
  font-size: 14px;
  font-weight: 600;
}

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

.history-empty {
  padding: 16px 14px;
  border: 1px dashed var(--line-strong);
  border-radius: 14px;
  background: #ffffff;
}

.history-empty p,
.history-empty span {
  margin: 0;
}

.history-empty span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.user-card,
.user-menu-trigger,
.user-copy {
  display: grid;
  gap: 2px;
}

.user-copy strong {
  font-size: 14px;
}

.user-copy span {
  color: var(--muted);
  font-size: 12px;
}

.chat-shell {
  display: grid;
  grid-template-rows: minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
  padding: 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 24px;
  min-height: 60px;
  position: relative;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: #ffffff;
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.mobile-toggle {
  display: none;
}

.tabbar {
  display: inline-flex;
  align-items: center;
  gap: 0;
  height: 60px;
}

.tab {
  height: 60px;
  padding: 0 20px;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  border-bottom: 2px solid transparent;
}

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.avatar.large {
  width: 40px;
  height: 40px;
}

.user-menu {
  position: relative;
}

.user-menu-trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 6px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: #ffffff;
  color: var(--text);
  cursor: pointer;
  font: inherit;
}

.user-menu-trigger:hover,
.user-menu.open .user-menu-trigger {
  border-color: var(--line);
  background: #f9fbff;
}

.caret {
  width: 8px;
  height: 8px;
  margin-left: 4px;
  border-right: 1.5px solid #7b8794;
  border-bottom: 1.5px solid #7b8794;
  transform: rotate(45deg);
}

.user-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 184px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 140ms ease, transform 140ms ease, visibility 140ms ease;
}

.user-menu.open .user-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-dropdown-section {
  padding: 10px 12px 8px;
  border-bottom: 1px solid var(--line);
}

.user-dropdown-label {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 12px;
}

.user-dropdown-name {
  display: block;
  font-size: 14px;
}

.user-dropdown-link {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 40px;
  padding: 0 12px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  text-decoration: none;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.user-dropdown-link:hover {
  background: #f5f8fc;
}

.user-dropdown-form {
  gap: 0;
}

.danger-link {
  color: #c2410c;
}

.chat-stage {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
  height: 100%;
  background: #ffffff;
  overflow: hidden;
}

.chat-scroll-wrap {
  position: relative;
  min-height: 0;
  height: 100%;
}

.chat-scroll {
  height: 100%;
  min-height: 0;
  padding: 32px 104px 24px min(6vw, 64px);
  overflow-y: auto;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: #c4cfdd #f4f7fb;
}

.chat-scroll::-webkit-scrollbar {
  width: 12px;
}

.chat-scroll::-webkit-scrollbar-track {
  background: #f4f7fb;
}

.chat-scroll::-webkit-scrollbar-thumb {
  border: 3px solid #f4f7fb;
  border-radius: 999px;
  background: #c4cfdd;
}

.chat-scroll::-webkit-scrollbar-thumb:hover {
  background: #a9b8ca;
}

.hidden {
  display: none;
}

.conversation-header,
.empty-state {
  max-width: 920px;
  margin: 0 auto 28px;
}

.conversation-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.conversation-header h1,
.empty-state h1 {
  font-size: 32px;
}

.conversation-meta {
  padding-top: 10px;
  color: var(--muted);
  font-size: 13px;
}

.message {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 18px;
  max-width: 860px;
  margin: 0 auto 18px;
}

.message.user {
  grid-template-columns: minmax(0, 1fr) 44px;
}

.message.user .message-bubble {
  order: -1;
  background: #ffffff;
}

.message-bubble {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #f8fbff;
  line-height: 1.7;
  min-width: 0;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.message-bubble p,
.message-content p {
  margin: 0;
  line-height: 1.8;
  min-width: 0;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.message-content {
  display: grid;
  gap: 14px;
  line-height: 1.8;
  min-width: 0;
  max-width: 100%;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.message-content a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.message-content a:hover {
  text-decoration: underline;
}

.message-bubble.streaming {
  position: relative;
}

.message-bubble.streaming::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 18px;
  margin-left: 6px;
  border-radius: 999px;
  background: var(--accent);
  vertical-align: middle;
  animation: pulse-caret 0.9s ease-in-out infinite;
}

.message,
.conversation-header {
  scroll-margin-top: 20px;
}

.user-mark {
  background: #dbe7ff;
}

.node-rail {
  position: absolute;
  top: 28px;
  right: 28px;
  bottom: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 28px;
  pointer-events: none;
}

.node-rail-line {
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, #eef3fa 0%, #d6dfeb 100%);
  border-radius: 999px;
}

.node-anchor {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  text-decoration: none;
  pointer-events: auto;
}

.node-dot {
  width: 12px;
  height: 12px;
  border: 2px solid #d8e0eb;
  border-radius: 999px;
  background: #f5f8fc;
  transition: transform 140ms ease, background 140ms ease, border-color 140ms ease;
}

.node-anchor:hover .node-dot {
  transform: scale(1.08);
  border-color: #9eb5df;
}

.node-anchor.active .node-dot {
  border-color: var(--accent);
  background: var(--accent);
}

.node-anchor.latest .node-dot {
  background: #7f8da3;
  border-color: #7f8da3;
}

.composer-wrap {
  padding: 18px 24px 24px;
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.composer {
  max-width: 860px;
  margin: 0 auto;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: #ffffff;
  box-shadow: 0 8px 24px rgba(31, 42, 55, 0.06);
}

.composer textarea {
  width: 100%;
  min-height: 36px;
  max-height: 180px;
  resize: vertical;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  line-height: 1.7;
  outline: none;
}

.composer-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
}

.composer-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tool-chip {
  height: 34px;
  padding: 0 14px;
  background: var(--panel-muted);
  color: var(--accent);
}

.passive-chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
}

.send-button {
  height: 40px;
  min-width: 88px;
  padding: 0 18px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 700;
}

.send-button:disabled {
  background: #a8bee8;
  cursor: wait;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.workspace[data-sidebar-state="collapsed"] {
  grid-template-columns: 88px minmax(0, 1fr) 340px;
}

.workspace[data-sidebar-state="collapsed"] .brand-text,
.workspace[data-sidebar-state="collapsed"] .brand-subtitle,
.workspace[data-sidebar-state="collapsed"] .new-chat,
.workspace[data-sidebar-state="collapsed"] .search-form,
.workspace[data-sidebar-state="collapsed"] .sidebar-label,
.workspace[data-sidebar-state="collapsed"] .history-title,
.workspace[data-sidebar-state="collapsed"] .history-meta {
  display: none;
}

.workspace[data-sidebar-state="collapsed"] .history-item {
  place-items: center;
  padding: 12px;
}

.workspace[data-sidebar-state="collapsed"] .sidebar {
  padding-left: 12px;
  padding-right: 12px;
}

.workspace[data-sidebar-state="collapsed"] .sidebar-header {
  justify-content: center;
}

.workspace[data-sidebar-state="collapsed"] .brand {
  display: none;
}

.summary-panel {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
  gap: 14px;
  min-width: 0;
  max-height: 100%;
  padding: 16px;
  overflow: auto;
  border-left: 1px solid var(--line);
  background: #ffffff;
}

.summary-section {
  display: grid;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
}

.summary-heading,
.summary-subheading,
.workflow-card header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.summary-heading h2,
.summary-subheading h3 {
  margin: 0;
  font-size: 16px;
}

.summary-heading span {
  color: var(--muted);
  font-size: 12px;
}

.upload-dropzone {
  display: grid;
  place-items: center;
  gap: 6px;
  min-height: 112px;
  padding: 18px;
  border: 1px dashed var(--accent);
  border-radius: 8px;
  background: #f5f9ff;
  color: var(--text);
  cursor: pointer;
  text-align: center;
}

.upload-dropzone.dragging {
  border-color: var(--accent-dark);
  background: #eaf2ff;
}

.upload-dropzone span,
.upload-status,
.attachment-item span,
.workflow-card em {
  color: var(--muted);
  font-size: 12px;
}

.upload-status {
  margin: 0;
  line-height: 1.5;
}

.attachment-list,
.workflow-card-list {
  display: grid;
  gap: 10px;
}

.attachment-item,
.workflow-card {
  display: grid;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.attachment-item {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
}

.attachment-item strong,
.workflow-card strong {
  display: block;
  overflow-wrap: anywhere;
  font-size: 13px;
}

.attachment-item em,
.workflow-status {
  padding: 3px 8px;
  border-radius: 999px;
  background: #eaf2ff;
  color: var(--accent);
  font-size: 11px;
  font-style: normal;
  font-weight: 700;
}

.workflow-card ol {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.node-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.status-running,
.status-retrying {
  color: var(--accent);
}

.status-success {
  color: #047857;
}

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

.panel-empty {
  padding: 14px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  color: var(--muted);
  text-align: center;
}

.message-bubble table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  line-height: 1.6;
  table-layout: fixed;
}

.message-bubble th,
.message-bubble td {
  padding: 8px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.message-bubble pre {
  max-width: 100%;
  overflow-x: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message-bubble code {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

@media (max-width: 980px) {
  .app-body {
    overflow: auto;
  }

  .app-shell {
    grid-template-rows: 60px auto;
    height: auto;
    min-height: 100vh;
  }

  .workspace {
    grid-template-columns: minmax(0, 1fr);
    height: auto;
    min-height: 0;
    overflow: visible;
  }

  .sidebar {
    position: fixed;
    inset: 60px auto 0 0;
    width: 280px;
    z-index: 20;
    box-shadow: var(--shadow);
    transform: translateX(-100%);
  }

  .workspace[data-sidebar-state="open"] .sidebar {
    transform: translateX(0);
  }

  .chat-shell {
    padding: 10px;
  }

  .mobile-toggle {
    display: inline-flex;
  }

  .topbar,
  .chat-scroll,
  .composer-wrap {
    padding-left: 16px;
    padding-right: 16px;
  }

  .topbar {
    align-items: center;
    flex-direction: row;
    min-height: 60px;
    padding-top: 0;
    padding-bottom: 0;
  }

  .topbar-left {
    flex: 1 1 auto;
    overflow: hidden;
  }

  .topbar-right {
    flex: 0 0 auto;
    width: auto;
    justify-content: flex-end;
  }

  .conversation-header {
    flex-direction: column;
  }

  .chat-stage {
    min-height: calc(100vh - 60px);
    height: auto;
  }

  .summary-panel {
    max-height: none;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .chat-scroll {
    padding-right: 72px;
  }

  .node-rail {
    right: 14px;
  }
}

@media (max-width: 640px) {
  .tabbar {
    overflow-x: auto;
    max-width: 100%;
  }

  .user-card {
    min-width: 0;
  }

  .user-menu-trigger {
    min-width: 0;
  }

  .user-copy strong,
  .user-copy span {
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .message,
  .message.user {
    grid-template-columns: 1fr;
  }

  .message-avatar {
    display: none;
  }

  .composer-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .composer-tools {
    width: 100%;
  }

  .send-button {
    width: 100%;
  }

  .chat-shell {
    padding: 0;
  }

  .chat-stage {
    min-height: calc(100vh - 60px);
    height: auto;
  }

  .chat-scroll {
    padding-right: 44px;
  }

  .node-rail {
    right: 8px;
    gap: 10px;
    width: 20px;
  }

  .node-dot {
    width: 10px;
    height: 10px;
  }
}

@keyframes pulse-caret {
  0%,
  100% {
    opacity: 0.25;
  }
  50% {
    opacity: 1;
  }
}