:root {
  color-scheme: light;
  --app-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --chrome: rgba(0, 0, 0, 0.035);
  --surface: #ffffff;
  --surface-soft: rgba(255, 255, 255, 0.9);
  --surface-muted: #f5f5f8;
  --field: rgba(0, 0, 0, 0.06);
  --hover: rgba(0, 0, 0, 0.06);
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.14);
  --text: rgba(0, 0, 0, 0.92);
  --muted: rgba(0, 0, 0, 0.6);
  --faint: rgba(0, 0, 0, 0.36);
  --accent-rgb: 94 92 230;
  --accent: #5e5ce6;
  --list-active: rgb(var(--accent-rgb) / 0.16);
  --shadow: 0 14px 34px rgba(20, 24, 40, 0.08);
  --sidebar-width: 286px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --chrome: #121318;
  --surface: #1f2128;
  --surface-soft: rgba(31, 33, 40, 0.92);
  --surface-muted: #171920;
  --field: rgba(255, 255, 255, 0.08);
  --hover: rgba(255, 255, 255, 0.08);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --text: rgba(255, 255, 255, 0.94);
  --muted: rgba(255, 255, 255, 0.66);
  --faint: rgba(255, 255, 255, 0.44);
  --accent-rgb: 124 116 255;
  --accent: #7c74ff;
  --list-active: rgb(var(--accent-rgb) / 0.22);
  --shadow: 0 18px 46px rgba(0, 0, 0, 0.25);
}

* {
  box-sizing: border-box;
  scrollbar-width: none;
}

*::-webkit-scrollbar {
  width: 0;
  height: 0;
}

html,
body {
  margin: 0;
  width: 100%;
  min-height: 100%;
  overflow: hidden;
  background: var(--chrome);
  color: var(--text);
  font: 14px/1.5 var(--app-font);
  letter-spacing: 0;
}

button,
input,
textarea {
  font: inherit;
  letter-spacing: 0;
}

button {
  border: 0;
  cursor: pointer;
}

h1,
h2,
p {
  margin: 0;
}

.hidden,
.hidden-file-input,
.app-shell[data-auth="signed-in"] .login-view,
.app-shell:not([data-auth="signed-in"]) .main-view {
  display: none !important;
}

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

.login-view {
  display: grid;
  min-height: 100dvh;
  place-items: center;
  padding: 28px;
  background:
    radial-gradient(circle at 18% 12%, rgb(var(--accent-rgb) / 0.14), transparent 28%),
    var(--surface-muted);
}

.login-panel {
  display: grid;
  gap: 22px;
  width: min(440px, 100%);
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface-soft);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.login-brand {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
}

.brand-mark,
.rail-logo {
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: linear-gradient(145deg, #111827, #3f3dcd);
  color: #fff;
  font-weight: 760;
}

.brand-mark {
  width: 52px;
  height: 52px;
  font-size: 24px;
}

.login-brand h1 {
  font-size: 28px;
  line-height: 1.15;
}

.login-brand p,
.login-hint {
  color: var(--muted);
  font-size: 13px;
}

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

.login-form label {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.login-form input {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  outline: 0;
  padding: 0 12px;
  background: var(--surface);
  color: var(--text);
}

.login-form input:focus {
  border-color: rgb(var(--accent-rgb) / 0.58);
  box-shadow: 0 0 0 3px rgb(var(--accent-rgb) / 0.12);
}

.code-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 112px;
  gap: 8px;
}

.code-row button,
.primary-action {
  min-height: 44px;
  border-radius: 12px;
  font-weight: 720;
}

.code-row button {
  background: var(--field);
  color: var(--text);
}

.primary-action {
  background: var(--accent);
  color: #fff;
}

.main-view {
  display: grid;
  grid-template-columns: 60px var(--sidebar-width) minmax(0, 1fr);
  height: 100dvh;
  padding: 0 2px 2px 0;
  background: var(--chrome);
}

.nav-rail {
  display: grid;
  grid-template-rows: 54px repeat(4, 44px) minmax(0, 1fr) 44px;
  justify-items: center;
  align-items: center;
  gap: 4px;
  padding: 8px 0 14px;
}

.rail-logo {
  width: 38px;
  height: 38px;
  font-size: 18px;
}

.rail-spacer {
  width: 1px;
  min-height: 1px;
}

.rail-button {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: transparent;
  color: var(--muted);
}

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

.rail-button.active {
  color: var(--accent);
  background: var(--list-active);
}

.rail-button svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.rail-button em {
  position: absolute;
  right: 3px;
  top: 3px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-style: normal;
  font-weight: 800;
  line-height: 16px;
}

.sidebar,
.workspace {
  min-width: 0;
  min-height: 0;
  background: var(--surface-soft);
  box-shadow: var(--shadow);
}

.sidebar {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
  border-radius: 14px 0 0 14px;
}

.sidebar-tools {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 32px;
  align-items: center;
  gap: 6px;
  min-height: 66px;
  padding: 14px 10px 10px;
}

.search-box {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  align-items: center;
  height: 32px;
  padding: 0 8px;
  border-radius: 10px;
  background: var(--field);
  color: var(--faint);
}

.search-box input {
  width: 100%;
  height: 100%;
  border: 0;
  outline: 0;
  padding: 0;
  background: transparent;
  color: var(--text);
}

.icon-button {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font-size: 18px;
  font-weight: 300;
}

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

.persona-list {
  display: grid;
  align-content: start;
  gap: 2px;
  min-height: 0;
  padding: 6px 0;
  border-top: 1px solid var(--line);
  overflow: auto;
}

.persona-empty {
  padding: 14px 16px;
  color: var(--muted);
  font-size: 13px;
}

.persona {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  width: calc(100% - 14px);
  min-height: 60px;
  margin: 0 7px;
  padding: 9px 10px;
  border-radius: 11px;
  background: transparent;
  color: var(--text);
  text-align: left;
}

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

.persona.active {
  background: var(--list-active);
}

.avatar,
.profile-avatar {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background-color: var(--field);
  background-position: center;
  background-size: cover;
  color: var(--accent);
  font-size: 11px;
  font-weight: 760;
}

.utility-avatar {
  display: grid;
  place-items: center;
  background-image: none !important;
  background: rgb(var(--accent-rgb) / 0.12);
  color: var(--accent);
}

.persona-main,
.persona-side,
.persona-name,
.persona-preview,
.persona-time {
  min-width: 0;
}

.persona-main {
  display: grid;
  gap: 2px;
}

.persona-name,
.persona-preview,
.persona-time {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.persona-name {
  color: var(--text);
  font-size: 14px;
  font-weight: 430;
}

.persona.active .persona-name {
  color: var(--accent);
}

.persona-preview {
  color: var(--muted);
  font-size: 12px;
}

.persona-side {
  display: grid;
  justify-items: end;
  gap: 5px;
}

.persona-time {
  color: var(--faint);
  font-size: 11px;
}

.persona-unread {
  display: grid;
  min-width: 18px;
  height: 18px;
  place-items: center;
  padding: 0 5px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-weight: 800;
}

.workspace {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 66px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-soft);
}

.group-title {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.group-title h1 {
  overflow: hidden;
  font-size: 17px;
  font-weight: 520;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.group-title p {
  color: var(--muted);
  font-size: 12px;
}

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

.sync-pill {
  height: 28px;
  padding: 0 10px;
  border-radius: 9px;
  background: var(--field);
  color: var(--muted);
  font-size: 12px;
}

.sync-pill.ready {
  color: var(--accent);
  background: rgb(var(--accent-rgb) / 0.12);
}

.narrow-back-button {
  display: none;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font-size: 28px;
}

.chat-layout {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: 0;
  background: var(--surface);
}

.chat {
  display: grid;
  align-content: start;
  gap: 4px;
  overflow: auto;
  padding: 14px 18px 10px;
}

.message {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  width: 100%;
  min-width: 0;
  padding: 3px 6px;
}

.message.user {
  flex-direction: row-reverse;
}

.message .avatar {
  flex: 0 0 auto;
  margin-bottom: 2px;
}

.message-stack {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  min-width: 0;
  max-width: min(74%, 780px);
}

.message.user .message-stack {
  align-items: flex-end;
}

.bubble {
  width: fit-content;
  max-width: 100%;
  padding: 10px 15px;
  border-radius: 18px;
  background: rgba(0, 0, 0, 0.055);
  color: var(--text);
  line-height: 1.58;
  overflow-wrap: anywhere;
}

:root[data-theme="dark"] .bubble {
  background: rgba(255, 255, 255, 0.1);
}

.message.user .bubble {
  background: #2f68d8;
  color: #fff;
}

.message-time {
  margin: 0 8px;
  color: var(--faint);
  font-size: 10px;
  line-height: 1;
}

.typing-status {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  color: var(--accent);
}

.typing-dots {
  display: inline-flex;
  gap: 2px;
}

.typing-dots i {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.25;
  animation: typingDotBlink 1.4s 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 typingDotBlink {
  0%, 60%, 100% { opacity: 0.25; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-2px); }
}

.message-attachments {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  max-width: 100%;
}

.message-attachment {
  display: inline-grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 5px;
  max-width: 260px;
  height: 28px;
  padding: 0 8px;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.42);
  color: inherit;
  line-height: 1;
  text-decoration: none;
}

.message-attachment.image {
  display: block;
  width: min(360px, 58vw);
  max-width: 100%;
  height: auto;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.04);
  cursor: zoom-in;
}

.message-attachment-thumb {
  display: block;
  width: 34px;
  height: 34px;
  border-radius: 6px;
  object-fit: cover;
}

.message-attachment.image .message-attachment-thumb {
  width: 100%;
  height: auto;
  max-height: 360px;
  border-radius: 8px;
  object-fit: contain;
}

.message-attachment strong {
  overflow: hidden;
  font-size: 12px;
  font-weight: 400;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.composer {
  position: relative;
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0 18px 6px;
  border-top: 1px solid var(--line);
  background: var(--surface-soft);
}

.composer-input-row {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  margin: 0 -18px;
  padding: 0 18px;
  border-bottom: 1px solid var(--line);
}

.composer-add-button {
  position: relative;
  display: grid;
  width: 26px;
  height: 32px;
  place-items: center;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  font-size: 0;
}

.composer-add-button::before,
.composer-add-button::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 15px;
  height: 1.5px;
  border-radius: 999px;
  background: currentColor;
  transform: translate(-50%, -50%);
}

.composer-add-button::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.composer-add-button:hover {
  background: var(--hover);
}

.composer textarea {
  min-height: 41px;
  max-height: 156px;
  height: 41px;
  border: 0;
  outline: 0;
  resize: none;
  padding: 10px 0 7px;
  background: transparent;
  color: var(--text);
  overflow-y: hidden;
}

.composer textarea::placeholder {
  color: var(--faint);
}

.send-button {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font-size: 22px;
}

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

.send-button:disabled,
.composer textarea:disabled {
  cursor: wait;
  opacity: 0.55;
}

.composer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 26px;
  color: var(--muted);
  font-size: 12px;
}

.composer-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.model-avatar,
.model-avatar img {
  display: block;
  width: 16px;
  height: 16px;
}

.composer-dot {
  color: var(--faint);
}

.model-switch-status {
  overflow: hidden;
  color: var(--faint);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.model-switch-status.online {
  color: var(--accent);
}

.composer-attachments {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-top: 6px;
  overflow-x: auto;
}

.composer-attachment {
  display: inline-grid;
  grid-template-columns: 26px minmax(0, max-content) 18px;
  align-items: center;
  gap: 6px;
  max-width: 220px;
  height: 32px;
  padding: 3px 4px 3px 3px;
  border-radius: 7px;
  background: var(--field);
  color: var(--text);
  font-size: 12px;
  white-space: nowrap;
}

.composer-attachment img {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  object-fit: cover;
}

.composer-attachment span {
  overflow: hidden;
  text-overflow: ellipsis;
}

.composer-attachment button {
  width: 18px;
  height: 18px;
  border-radius: 5px;
  background: transparent;
  color: var(--muted);
}

.image-preview-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: grid;
  place-items: center;
  padding: 28px;
  background: rgba(0, 0, 0, 0.78);
  cursor: zoom-out;
}

.image-preview-overlay img {
  display: block;
  max-width: min(96vw, 1280px);
  max-height: 92vh;
  border-radius: 10px;
  object-fit: contain;
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.42);
  cursor: default;
}

.image-preview-close {
  position: fixed;
  top: 14px;
  right: 16px;
  width: 34px;
  height: 34px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.18);
  color: #fff;
  font-size: 24px;
}

.utility-view {
  min-height: 0;
  overflow: auto;
  padding: 20px;
  background: var(--surface);
}

.utility-shell {
  display: grid;
  gap: 16px;
  max-width: 920px;
}

.profile-panel,
.utility-hero,
.bridge-panel {
  display: grid;
  gap: 14px;
  align-items: center;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
}

.profile-panel {
  grid-template-columns: 72px minmax(0, 1fr) auto;
}

.profile-large {
  width: 72px;
  height: 72px;
}

.profile-panel h2,
.utility-hero h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 620;
}

.profile-panel p,
.utility-hero p {
  margin-top: 4px;
  color: var(--muted);
}

.bridge-panel {
  grid-template-columns: minmax(180px, 0.8fr) minmax(0, 1.4fr) auto;
}

.bridge-panel h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 650;
}

.bridge-panel p {
  margin-top: 4px;
  color: var(--muted);
}

.bridge-panel code {
  min-width: 0;
  overflow: auto;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--field);
  color: var(--text);
  font: 12px/1.45 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: nowrap;
}

.bridge-panel-copy {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.utility-action {
  min-height: 36px;
  padding: 0 14px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 650;
}

.utility-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.utility-grid article {
  display: grid;
  gap: 8px;
  min-height: 86px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
}

.utility-grid strong,
.timeline-list strong {
  font-weight: 560;
}

.utility-grid span,
.timeline-list p,
.timeline-list em {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

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

.timeline-list article {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-soft);
}

.timeline-list article > span {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--accent);
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 22px;
  z-index: 10020;
  max-width: min(520px, calc(100vw - 32px));
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-soft);
  color: var(--text);
  box-shadow: var(--shadow);
  transform: translateX(-50%);
  backdrop-filter: blur(18px);
}

@media (max-width: 760px) {
  body {
    background: var(--surface);
  }

  .main-view {
    grid-template-columns: 54px minmax(0, 1fr);
    padding: 0;
  }

  .nav-rail {
    grid-column: 1;
    grid-row: 1;
  }

  .sidebar,
  .workspace {
    grid-column: 2;
    grid-row: 1;
    border-radius: 0;
    box-shadow: none;
  }

  .main-view[data-pane="chat"] .sidebar {
    display: none;
  }

  .main-view:not([data-pane="chat"]) .workspace {
    display: none;
  }

  .narrow-back-button {
    display: grid;
    flex: 0 0 auto;
  }

  .topbar {
    min-height: 58px;
    padding: 9px 10px;
  }

  .group-title {
    gap: 9px;
  }

  .group-title h1 {
    font-size: 15px;
  }

  .sync-pill,
  #logoutButton {
    display: none;
  }

  .message-stack {
    max-width: min(84%, 560px);
  }

  .message-attachment.image {
    width: min(100%, 320px);
  }

  .composer-bottom {
    min-height: 22px;
  }

  .model-switch-status {
    display: none;
  }

  .utility-view {
    padding: 12px;
  }

  .profile-panel {
    grid-template-columns: 54px minmax(0, 1fr);
  }

  .profile-large {
    width: 54px;
    height: 54px;
  }

  .profile-panel .utility-action {
    grid-column: 1 / -1;
  }

  .bridge-panel {
    grid-template-columns: 1fr;
  }

  .bridge-panel code {
    white-space: normal;
    word-break: break-all;
  }

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