:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-soft: #eef3f7;
  --text: #1d2733;
  --muted: #637083;
  --border: #d9e1ea;
  --primary: #176c85;
  --primary-dark: #0e5369;
  --success: #0f7b4f;
  --danger: #b42318;
  --warning-bg: #fff8e6;
  --warning-border: #f3d48b;
  --shadow: 0 12px 32px rgba(25, 38, 52, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

.icp-footer {
  padding: 12px 16px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

.icp-footer a {
  color: inherit;
  text-decoration: none;
}

.icp-footer a:hover {
  color: var(--primary);
  text-decoration: underline;
}

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

.login-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
}

.login-shell {
  width: min(420px, calc(100% - 32px));
}

.login-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 28px;
}

.login-panel h1 {
  margin: 0;
  font-size: 26px;
  letter-spacing: 0;
}

.login-panel p {
  margin: 6px 0 20px;
  color: var(--muted);
}

.login-error {
  margin-bottom: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #fff0ed;
  color: var(--danger);
  border: 1px solid #ffd0c7;
}

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

.login-form label,
.upload-form label {
  display: grid;
  gap: 6px;
}

.login-form label span,
.upload-form label span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.login-form input,
.composer textarea,
.upload-form textarea,
.upload-form select,
.upload-form input[type="file"] {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  background: #ffffff;
  color: var(--text);
}

.login-form input,
.composer textarea,
.upload-form textarea,
.upload-form select {
  padding: 12px;
}

.upload-form input[type="file"] {
  padding: 10px;
}

.login-form input:focus,
.composer textarea:focus,
.upload-form textarea:focus,
.upload-form select:focus,
.upload-form input[type="file"]:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(23, 108, 133, 0.14);
}

.app-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0;
}

.topbar p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.content-grid {
  width: min(1280px, calc(100% - 32px));
  margin: 24px auto;
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 18px;
  align-items: start;
}

.home-panel,
.project-detail {
  width: min(1280px, calc(100% - 32px));
  margin: 24px auto 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 20px;
}

.home-head,
.detail-head,
.projects-toolbar,
.project-card-head,
.detail-actions,
.project-form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.home-head h2,
.detail-head h2 {
  margin: 0;
  font-size: 24px;
}

.home-head p:not(.eyebrow),
.detail-head p:not(.eyebrow) {
  margin: 4px 0 0;
  color: var(--muted);
}

.home-head button,
.detail-actions button,
.project-form-actions button {
  min-height: 40px;
  padding: 0 14px;
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
}

.projects-toolbar {
  margin-top: 18px;
  align-items: end;
}

.project-search {
  display: grid;
  gap: 6px;
  flex: 1;
}

.project-search span,
.archive-toggle span,
.project-dialog label span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.project-search input,
.project-dialog input,
.project-dialog textarea,
.project-dialog select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  background: #ffffff;
  color: var(--text);
  outline: none;
}

.project-dialog textarea {
  resize: vertical;
}

.project-search input:focus,
.project-dialog input:focus,
.project-dialog textarea:focus,
.project-dialog select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(23, 108, 133, 0.14);
}

.archive-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
}

.project-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.project-list .empty {
  grid-column: 1 / -1;
  color: var(--muted);
  margin: 0;
}

.project-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
  padding: 14px;
  cursor: pointer;
  min-height: 148px;
}

.project-card:hover,
.project-card:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(23, 108, 133, 0.1);
  outline: none;
}

.project-card.archived {
  opacity: 0.72;
}

.project-card h3 {
  margin: 0;
  font-size: 17px;
  overflow-wrap: anywhere;
}

.project-card p {
  margin: 10px 0;
  color: var(--muted);
  font-size: 14px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.status-badge {
  flex: 0 0 auto;
  border-radius: 999px;
  padding: 3px 8px;
  background: var(--surface-soft);
  color: var(--primary-dark);
  font-size: 12px;
  font-weight: 800;
}

.project-detail.hidden {
  display: none;
}

.detail-actions {
  flex-wrap: wrap;
  justify-content: flex-end;
}

.detail-actions button {
  background: var(--surface-soft);
  color: var(--text);
}

.detail-actions .danger-button,
.project-form-actions .danger-button {
  background: #fff0ed;
  color: var(--danger);
}

.project-meta-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  margin-top: 18px;
}

.project-meta-grid div {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  background: #fbfcfd;
}

.project-meta-grid span,
.project-meta-grid strong {
  display: block;
}

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

.project-meta-grid strong {
  margin-top: 3px;
  font-size: 15px;
  overflow-wrap: anywhere;
}

.project-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.project-tabs button {
  padding: 8px 10px;
  background: var(--surface-soft);
  color: var(--text);
  border: 1px solid var(--border);
}

.project-tabs button.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

.project-tabs button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.tab-placeholder {
  margin-top: 12px;
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 14px;
  background: var(--surface-soft);
}

.tab-placeholder h3 {
  margin: 0 0 6px;
}

.tab-placeholder p {
  margin: 0;
  color: var(--muted);
}

.chat-panel,
.upload-panel,
.manager-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.chat-panel {
  min-height: calc(100vh - 156px);
  display: flex;
  flex-direction: column;
}

.side-panel {
  display: grid;
  gap: 18px;
}

.messages {
  flex: 1;
  min-height: 55vh;
  max-height: calc(100vh - 245px);
  overflow-y: auto;
  padding: 22px;
}

.welcome {
  border: 1px dashed var(--border);
  background: var(--surface-soft);
  border-radius: 8px;
  padding: 24px;
  text-align: center;
}

.welcome h2 {
  margin: 0 0 8px;
  font-size: 22px;
}

.welcome p {
  margin: 0;
  color: var(--muted);
}

.message {
  display: grid;
  gap: 8px;
  margin: 18px 0;
}

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

.bubble {
  border-radius: 8px;
  padding: 14px 16px;
  overflow-wrap: anywhere;
}

.message.user .bubble {
  background: #dcf0f5;
  border: 1px solid #b9dce6;
}

.message.ai .bubble {
  background: #ffffff;
  border: 1px solid var(--border);
}

.message.loading .bubble {
  color: var(--muted);
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
}

.markdown h1,
.markdown h2,
.markdown h3 {
  margin: 14px 0 8px;
  line-height: 1.35;
  letter-spacing: 0;
}

.markdown h1 {
  font-size: 22px;
}

.markdown h2 {
  font-size: 18px;
}

.markdown h3 {
  font-size: 16px;
}

.markdown p {
  margin: 8px 0;
}

.markdown ul,
.markdown ol {
  margin: 8px 0 8px 22px;
  padding: 0;
}

.markdown pre,
.markdown-dialog pre {
  margin: 12px 0;
  padding: 12px;
  background: #101820;
  color: #eef6fb;
  border-radius: 8px;
  overflow-x: auto;
}

.markdown code {
  font-family: "Consolas", "SFMono-Regular", monospace;
  font-size: 0.94em;
}

.markdown :not(pre) > code {
  background: #eef3f7;
  color: #0c4152;
  border-radius: 4px;
  padding: 1px 5px;
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  padding: 14px;
  border-top: 1px solid var(--border);
  background: #f9fbfc;
}

.composer textarea {
  resize: vertical;
  min-height: 64px;
  max-height: 180px;
}

.upload-form textarea {
  resize: vertical;
}

button,
.login-form button,
.composer button,
.upload-form button,
.recent-title button,
.file-actions button {
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}

.login-form button,
.composer button,
.upload-form button {
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
}

.login-form button,
.upload-form button {
  width: 100%;
  min-height: 44px;
}

.composer button {
  align-self: end;
  min-width: 90px;
  height: 44px;
}

.login-form button:hover,
.composer button:hover,
.upload-form button:hover {
  background: var(--primary-dark);
}

.composer button:disabled,
.upload-form button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.logout-button {
  min-height: 38px;
  padding: 0 14px;
  background: var(--surface-soft);
  color: var(--text);
  border: 1px solid var(--border);
}

.upload-panel,
.manager-panel {
  padding: 18px;
}

.panel-heading h2,
.recent-title h2 {
  margin: 0;
  font-size: 20px;
}

.panel-heading p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.upload-form {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.upload-status {
  min-height: 22px;
  margin: 0;
  font-size: 13px;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.upload-status.loading {
  color: var(--primary-dark);
}

.upload-status.success {
  color: var(--success);
}

.recent-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.recent-title button {
  padding: 6px 10px;
  background: var(--surface-soft);
  color: var(--text);
}

.file-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.file-list li {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  background: #fbfcfd;
}

.file-list strong,
.file-list span {
  display: block;
}

.file-list strong {
  font-size: 13px;
  overflow-wrap: anywhere;
}

.file-list span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

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

.file-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.file-actions button,
.dialog-head button {
  padding: 7px 10px;
  background: var(--surface-soft);
  color: var(--text);
}

.file-actions .danger-button {
  background: #fff0ed;
  color: var(--danger);
}

.markdown-dialog {
  width: min(900px, calc(100% - 28px));
  max-height: min(760px, calc(100vh - 40px));
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
  box-shadow: var(--shadow);
}

.project-dialog {
  width: min(720px, calc(100% - 28px));
  max-height: min(760px, calc(100vh - 40px));
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0;
  box-shadow: var(--shadow);
}

.project-dialog::backdrop {
  background: rgba(16, 24, 32, 0.45);
}

.project-form-body {
  display: grid;
  gap: 14px;
  padding: 16px;
}

.project-form-body label {
  display: grid;
  gap: 6px;
}

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

.project-form-actions {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  justify-content: flex-end;
}

.markdown-dialog::backdrop {
  background: rgba(16, 24, 32, 0.45);
}

.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.dialog-head h2 {
  margin: 0;
  font-size: 18px;
  overflow-wrap: anywhere;
}

.markdown-dialog pre {
  max-height: calc(100vh - 170px);
  margin: 0;
  border-radius: 0;
  white-space: pre-wrap;
}

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

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  max-width: min(520px, calc(100% - 32px));
  padding: 12px 16px;
  background: var(--danger);
  color: #ffffff;
  border-radius: 8px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease;
  z-index: 20;
}

.toast.show {
  opacity: 1;
}

@media (max-width: 980px) {
  .project-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .project-meta-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .chat-panel {
    min-height: auto;
  }

  .messages {
    min-height: 48vh;
  }
}

@media (max-width: 700px) {
  .topbar {
    padding: 14px 16px;
  }

  .topbar h1 {
    font-size: 21px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .logout-button {
    width: 100%;
  }

  .content-grid {
    width: 100%;
    margin: 0;
    gap: 0;
  }

  .home-panel,
  .project-detail {
    width: 100%;
    margin: 0;
    border-left: 0;
    border-right: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .home-head,
  .detail-head,
  .projects-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .home-head button,
  .detail-actions button {
    width: 100%;
  }

  .project-list,
  .project-meta-grid,
  .project-form-grid {
    grid-template-columns: 1fr;
  }

  .chat-panel,
  .upload-panel,
  .manager-panel {
    border-left: 0;
    border-right: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .messages {
    min-height: calc(100vh - 420px);
    max-height: none;
    padding: 16px;
  }

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

  .composer button {
    width: 100%;
  }

  .upload-panel,
  .manager-panel {
    padding: 16px;
    border-top: 0;
  }
}