* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #1A1A24;
  --banner-bg: #1A1924;
  --banner-text: #FDE401;
  --panel: #232332;
  --panel-2: #2b2b3d;
  --border: #3a3a52;
  --text: #f2f2f7;
  --muted: #b9b9c9;
  --accent: #FFE600;
  --danger: #ff7d7d;
  --success: #85d7a2;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica", "Arial", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.banner {
  background: linear-gradient(rgba(26, 25, 36, 0.72), rgba(26, 25, 36, 0.72)), url('/research-agent-banner.png') center / cover no-repeat;
  border: 10px solid #1A1A24;
  padding: 20px 28px 20px 20px;
}

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

.banner h1,
.banner .subtitle,
.banner-user,
.sign-out-btn,
.user-name-text,
.user-avatar {
  color: var(--banner-text);
}

.banner h1 {
  font-size: 30px;
  line-height: 1.15;
}

.banner .subtitle {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.5;
  max-width: 1200px;
}

.banner-user {
  display: none;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.sign-out-btn {
  border: 1px solid rgba(26, 26, 36, 0.35);
  background: rgba(26, 26, 36, 0.06);
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
}

.sign-out-btn:hover {
  background: rgba(26, 26, 36, 0.14);
}

.content-container {
  flex: 1;
  display: flex;
  min-height: 0;
}

.navigation-pane {
  width: 220px;
  min-width: 220px;
  background: var(--bg);
  border-right: 1px solid var(--border);
  padding: 16px 10px;
}

.navigation-pane ul {
  list-style: none;
}

.navigation-pane li {
  margin-bottom: 10px;
}

.nav-button {
  width: 100%;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  text-align: left;
  font-size: 15px;
  font-weight: 600;
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
}

.nav-button:hover {
  background: var(--accent);
  color: #1A1A24;
}

.nav-button.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(255, 230, 0, 0.08);
}

.main-panel {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: var(--bg);
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.main-panel::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.main-panel:hover {
  scrollbar-width: thin;
}

.main-panel:hover::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

.main-panel:hover::-webkit-scrollbar-thumb {
  background: #4b4b66;
  border-radius: 999px;
}

.main-panel:hover::-webkit-scrollbar-track {
  background: transparent;
}

.content-section {
  display: none;
}

.content-section.active {
  display: block;
}

#browse-section {
  will-change: transform;
}

#browse-section.rubberbanding {
  transition: transform 220ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.content-section h2 {
  font-size: 24px;
  margin-bottom: 12px;
}

.main-panel p,
.agent-description {
  color: var(--muted);
}

.browse-shell,
.response-area,
.query-response-pair,
.tool-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.browse-shell {
  padding: 16px;
}

.browse-filter-bar {
  margin: 16px 0;
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  padding-left: 20px;
}

.browse-filter-label {
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

.topic-filter {
  position: relative;
}

.search-filter {
  position: relative;
  margin-left: auto;
}

.filter-button,
.sort-select,
.submit-button,
.clear-button {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  font-family: inherit;
}

.auth-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: #fff;
  align-items: center;
  justify-content: center;
}

.auth-overlay-text {
  font-size: 1.1rem;
  color: #555;
}

.rendered-diagram-img {
  max-width: 100%;
  border: 1px solid #ddd;
  border-radius: 4px;
  margin: 8px 0;
}

.filter-button,
.sort-select {
  padding: 8px 20px;
  min-height: 38px;
}

.search-input {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  font-family: inherit;
  padding: 8px 12px;
  min-height: 38px;
  width: 220px;
}

.search-input::placeholder {
  color: #9b9bb0;
}

.search-suggest-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  width: 100%;
  max-height: 260px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
  padding: 6px;
  z-index: 30;
}

.search-suggest-item {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  text-align: left;
  padding: 8px;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
}

.search-suggest-item:hover {
  background: var(--panel-2);
}

.search-suggest-item.selected {
  background: var(--panel-2);
  color: var(--accent);
}

.filter-button {
  cursor: pointer;
  text-align: left;
}

.sort-select {
  min-width: 180px;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  padding-right: 44px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath fill='%23FDE401' d='M1 1l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-size: 10px 6px;
  background-position: 90% center;
}

.filter-button:focus-visible,
.search-input:focus-visible,
.sort-select:focus-visible,
.submit-button:focus-visible,
.clear-button:focus-visible,
textarea:focus-visible,
.nav-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.topic-filter-menu {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  width: 320px;
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
  padding: 8px;
  z-index: 30;
}

.topic-option {
  display: flex;
  align-items: center;
  gap: 10px;
  border-radius: 6px;
  padding: 6px;
  color: var(--text);
}

.topic-option:hover {
  background: var(--panel-2);
}

.topic-option input:disabled + span {
  color: #7f7f93;
}

.browse-summary {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 10px;
}

.common-topics-bar {
  margin: 0 0 12px;
  padding: 5px 20px;
  border-top: 2px solid #FFE600;
  border-bottom: 2px solid #FFE600;
  background: #1A1A24;
  display: none;
  align-items: center;
  gap: 12px;
  min-height: 38px;
}

.common-topics-label {
  color: #FFE600;
  font-size: 14px;
  font-weight: 700;
  flex: 0 0 auto;
}

.common-topics-list {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
}

.common-topics-topic-item,
.common-topics-more-button,
.common-topics-more-item {
  border: 0;
  background: transparent;
  color: #FFFFFF;
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  line-height: 1.3;
}

.common-topics-topic-item:hover,
.common-topics-more-button:hover,
.common-topics-more-item:hover {
  color: #FFE600;
}

.common-topics-topic-item.selected,
.common-topics-more-button.selected,
.common-topics-more-item.selected {
  color: #FFE600;
}

.common-topics-more {
  position: relative;
  margin-left: auto;
  flex: 0 0 auto;
}

.common-topics-more-button {
  text-transform: lowercase;
}

.common-topics-more-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  min-width: 180px;
  max-height: 260px;
  overflow-y: auto;
  border: 1px solid #FFE600;
  border-radius: 8px;
  background: #1A1A24;
  padding: 8px 10px;
  display: none;
  z-index: 35;
}

.common-topics-more-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 4px 0;
}

.browse-list {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.browse-file-list {
  list-style: none;
}

.browse-file-item {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.browse-file-item:last-child {
  border-bottom: none;
}

.file-name,
.file-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

.file-title {
  border: 0;
  background: transparent;
  text-align: left;
  padding: 0;
  cursor: pointer;
}

.file-title:hover {
  color: var(--accent);
}

.file-summary {
  border: 0;
  background: transparent;
  text-align: left;
  color: var(--muted);
  line-height: 1.5;
  padding: 0;
  cursor: pointer;
}

.file-summary:hover {
  color: var(--text);
}

.file-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  font-size: 12px;
  color: var(--muted);
}

.topic-pill {
  border-radius: 999px;
  border: 1px solid rgba(255, 230, 0, 0.35);
  background: rgba(255, 230, 0, 0.14);
  color: var(--accent);
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
}

.open_in_new_tab {
  display: none !important;
  width: 24px;
  height: 24px;
  border: 0;
  border-radius: 6px;
  background: #AAAAAA;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.open_in_new_tab img {
  width: 14px;
  height: 14px;
  object-fit: contain;
}

.open_in_new_tab:hover {
  filter: brightness(0.9);
}

.document-preview-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(0, 0, 0, 0.65);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.document-preview {
  width: min(900px, 100%);
  max-height: min(80vh, 920px);
  background: #1A1A24;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  color: #fff;
}

.document-preview-close {
  position: absolute;
  right: 12px;
  top: 8px;
  border: 0;
  background: transparent;
  color: #fff;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.document-preview-title {
  padding-right: 28px;
}

.document-preview-body {
  margin-top: 12px;
  overflow: auto;
  color: #fff;
  line-height: 1.65;
}

.document-preview-body p,
.document-preview-body li {
  color: #fff;
}

.document-preview-body pre {
  background: #12121a;
  border: 1px solid #323248;
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
}

.browse-load-indicator {
  margin-top: 10px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
}

.back-to-top-btn {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  z-index: 40;
  width: unset;
  height: 50px;
  border: 1px solid rgba(255, 230, 0, 0.45);
  background: #FFE600;
  color: #1A1A24;
  padding: 10px;
  border-radius: 10px 10px 0 0;
  cursor: pointer;
  font-weight: 600;
  display: block;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition-property: opacity, visibility;
  transition-timing-function: ease, linear;
  transition-duration: 2s, 0s;
  transition-delay: 0s, 2s;
}

.back-to-top-btn.visible {
  visibility: visible;
  opacity: 0.3;
  pointer-events: auto;
  transition-duration: 0.2s, 0s;
  transition-delay: 0s, 0s;
}

.back-to-top-btn.visible:hover {
  opacity: 0.85;
}

.back-to-read-btn {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  z-index: 41;
  border: 1px solid rgba(255, 230, 0, 0.45);
  background: #FFE600;
  color: #1A1A24;
  padding: 10px 16px;
  border-radius: 10px 10px 0 0;
  cursor: pointer;
  font-weight: 600;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 2s ease, visibility 0s linear 2s;
}

.back-to-read-btn.visible {
  opacity: 0.9;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 2s ease, visibility 0s linear 0s;
}

.back-to-read-btn.visible:hover {
  opacity: 1;
}

.prompt-interface {
  margin-top: 14px;
}

.prompt-interface textarea {
  width: 100%;
  min-height: 120px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  font-family: inherit;
  padding: 12px;
  resize: vertical;
}

.button-group {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

.submit-button,
.clear-button {
  cursor: pointer;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
}

.submit-button {
  background: var(--accent);
  color: #1A1A24;
  border-color: var(--accent);
}

.submit-button:hover {
  filter: brightness(0.95);
}

.submit-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.clear-button:hover {
  background: #35354b;
}

.response-area {
  margin-top: 16px;
  padding: 14px;
}

.query-response-pair {
  padding: 16px;
  margin-bottom: 14px;
}

.query-section {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 12px;
}

.query-header,
.response-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.query-text {
  background: var(--panel-2);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 10px;
  color: var(--text);
  white-space: pre-wrap;
}

.model-badge {
  background: rgba(255, 230, 0, 0.16);
  border: 1px solid rgba(255, 230, 0, 0.35);
  color: var(--accent);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 12px;
}

.response-body {
  color: #fff;
  line-height: 1.65;
}

.response-body p,
.response-body li {
  color: #fff;
}

.response-body code {
  background: #171720;
  border: 1px solid #323248;
  border-radius: 4px;
  padding: 1px 5px;
}

.response-body pre {
  background: #12121a;
  border: 1px solid #323248;
  border-radius: 8px;
  padding: 12px;
  overflow-x: auto;
}

.reference-link {
  display: inline-block;
  margin-left: 2px;
  font-size: 0.75em;
  line-height: 1;
  vertical-align: super;
  color: #FFE600;
  text-decoration: none;
  cursor: pointer;
}

.reference-link:hover {
  text-decoration: underline;
}

.reference-target {
  scroll-margin-top: 88px;
}

@keyframes referenceGlowPulse {
  0%, 100% { background-color: transparent; }
  50% { background-color: rgba(255, 230, 0, 0.45); }
}

.reference-glow {
  animation: referenceGlowPulse 0.55s ease-in-out 2;
}

.loading {
  display: flex;
  align-items: center;
  gap: 10px;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 3px solid #3b3b4f;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.error-message {
  background: rgba(255, 125, 125, 0.12);
  border: 1px solid rgba(255, 125, 125, 0.45);
  color: var(--danger);
  border-radius: 8px;
  padding: 10px;
}

.success-message {
  background: rgba(133, 215, 162, 0.12);
  border: 1px solid rgba(133, 215, 162, 0.45);
  color: var(--success);
  border-radius: 8px;
  padding: 10px;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.tool-thumbnail {
  height: 170px;
  background: var(--panel-2);
  border-bottom: 1px solid var(--border);
}

.tool-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.tool-content {
  padding: 14px;
}

.tool-content h3 {
  color: var(--text);
  margin-bottom: 8px;
}

.tool-description {
  color: var(--muted);
  margin-bottom: 10px;
}

.tool-link {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.tool-link:hover {
  text-decoration: underline;
}

.loading-message {
  padding: 18px;
  color: var(--muted);
}

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

@media (max-width: 900px) {
  .content-container {
    flex-direction: column;
  }

  .navigation-pane {
    width: 100%;
    min-width: 100%;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .navigation-pane ul {
    display: flex;
    gap: 8px;
  }

  .navigation-pane li {
    margin-bottom: 0;
    flex: 1;
  }

  .topic-filter-menu {
    width: min(92vw, 320px);
  }

  .search-input {
    width: min(92vw, 220px);
  }

  .common-topics-bar {
    padding-left: 12px;
    padding-right: 12px;
    gap: 8px;
  }

  .banner-content {
    flex-direction: column;
  }
}