style.css

/* ─── Reset & base ──────────────────────────────────────────────────────────── */

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

:root {
  /* Palette */
  --bg-deep:      #0d0f14;
  --bg-panel:     #13161e;
  --bg-surface:   #1a1d27;
  --bg-hover:     #22263a;
  --border:       #2a2f45;
  --text-primary:  #e4e8f0;
  --text-secondary:#8892a4;
  --text-muted:    #50596a;
  --accent:        #5b8af7;
  --accent-dim:    #2a3e7a;
  --accent-hover:  #7aa3ff;
  --red:           #f27c7c;
  --green:         #5bdf9c;
  --yellow:        #f5c842;

  /* Layout */
  --sidebar-w:    280px;
  --header-h:      52px;
  --input-bottom:  80px;

  /* Typography */
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
}

html, body {
  height: 100%;
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  overflow: hidden;
}

/* ─── Utility ───────────────────────────────────────────────────────────────── */

.hidden {
  display: none !important;
}

/* ─── Top navigation ────────────────────────────────────────────────────────── */

#top-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  height: var(--header-h);
  padding: 0 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 50;
}

.nav-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.5px;
  flex-shrink: 0;
}

#nav-tabs {
  display: flex;
  gap: 2px;
  flex: 1;
}

.nav-tab {
  padding: 6px 16px;
  background: none;
  border: none;
  border-radius: 6px;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
}

.nav-tab:hover {
  color: var(--text-secondary);
  background: var(--bg-hover);
}

.nav-tab.active {
  color: var(--accent);
  background: var(--accent-dim);
}

/* ─── Tab panels ───────────────────────────────────────────────────────────── */

.tab-panel {
  height: calc(100vh - var(--header-h));
  overflow: hidden;
}

/* ─── Loading overlay ──────────────────────────────────────────────────────── */

#load-overlay {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgb(13 15 20 / 85%);
  z-index: 100;
}

.load-card {
  width: 480px;
  max-width: 96vw;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 36px;
  text-align: center;
  box-shadow: 0 24px 64px rgb(0 0 0 / 60%);
}

.load-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.load-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
  margin-bottom: 28px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

#load-bar {
  height: 6px;
  background: var(--bg-hover);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 12px;
}

#load-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: inherit;
  transition: width 0.3s ease;
}

#load-status {
  font-size: 0.82rem;
  color: var(--text-secondary);
  min-height: 1.4em;
}

.load-note {
  margin-top: 20px;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ─── Model picker ──────────────────────────────────────────────────────────── */

.picker-search {
  margin-bottom: 10px;
}

.picker-search input,
#model-custom-id {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
  padding: 8px 12px;
}

.picker-search input:focus,
#model-custom-id:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

#model-list {
  list-style: none;
  max-height: 240px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-surface);
  margin-bottom: 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.model-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 14px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

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

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

.model-item.selected {
  background: var(--accent-dim);
  border-left: 3px solid var(--accent);
}

.model-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.model-item-label {
  font-size: 0.84rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.model-item-author {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.model-item-stats {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  flex-shrink: 0;
}

.model-item-stat {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

/* List status / error messages */

.model-list-status {
  padding: 16px 14px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  list-style: none;
}

.model-list-error {
  color: var(--red);
}

.model-list-retry {
  display: block;
  margin: 6px auto 0;
  cursor: pointer;
  background: none;
  border: none;
  font-size: 0.82rem;
  color: var(--accent);
  text-decoration: underline;
}

/* ─── Settings container ───────────────────────────────────────────────────── */

.settings-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 24px;
  overflow-y: auto;
  height: 100%;
}

.settings-container h1 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.settings-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
}

.settings-card h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.settings-card-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.5;
}

.settings-card label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
  margin-top: 10px;
}

.settings-card label:first-of-type {
  margin-top: 0;
}

.settings-card input[type="password"],
.settings-card select {
  width: 100%;
  background: var(--bg-hover);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.8rem;
  font-family: inherit;
  padding: 6px 10px;
}

.settings-card select {
  cursor: pointer;
}

.settings-card input[type="password"]:focus,
.settings-card select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.settings-row {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}

.settings-field {
  flex: 1;
}

.settings-field label {
  margin-top: 0;
}

.settings-field select {
  width: 100%;
}

.settings-hint {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: 6px;
}

.optional-badge {
  font-size: 0.65rem;
  padding: 1px 5px;
  border-radius: 99px;
  background: var(--bg-hover);
  color: var(--text-muted);
  margin-left: 4px;
  vertical-align: middle;
}

.picker-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px 0 10px;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.picker-divider::before,
.picker-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

#model-custom-id {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

#load-btn {
  width: 100%;
  padding: 10px 0;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

#load-btn:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: scale(1.01);
}

#load-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ─── App layout ────────────────────────────────────────────────────────────── */

#chat-app {
  display: flex;
  height: 100%;
}

/* ─── Sidebar ───────────────────────────────────────────────────────────────── */

#sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

/* Model tag (used in chat header) */

.model-tag {
  font-size: 0.7rem;
  background: var(--accent-dim);
  color: var(--accent-hover);
  padding: 2px 7px;
  border-radius: 99px;
  letter-spacing: 0.04em;
}

/* Settings */

.settings-section {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.settings-section h2,
#embedding-panel h2 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.settings-section label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.settings-section label:last-child {
  margin-bottom: 0;
}

.value-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  align-self: flex-start;
}

input[type="number"],
input[type="range"] {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.82rem;
  font-family: inherit;
  width: 100%;
}

input[type="number"] {
  padding: 6px 10px;
}

input[type="range"] {
  border: none;
  padding: 4px 0;
  accent-color: var(--accent);
  cursor: pointer;
}

input[type="number"]:focus,
input[type="range"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Local file storage */
.drop-zone {
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  margin-bottom: 10px;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.drop-zone:focus-visible,
.drop-zone:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgb(91 138 247 / 40%);
}

.drop-zone:hover {
  background: rgb(91 138 247 / 5%);
}

.drop-zone.dragover {
  background: rgb(91 138 247 / 15%);
  border-color: var(--accent);
}

.local-file-row {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

#local-file-url {
  flex: 1;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.82rem;
  padding: 8px 10px;
}

#local-file-add {
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: var(--bg-deep);
  padding: 8px 12px;
  font-size: 0.82rem;
  cursor: pointer;
}

#local-file-add:hover {
  background: var(--accent-hover);
}

.local-files-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 150px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-surface);
}

.local-file-item {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-secondary);
}

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

.local-file-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.local-file-actions button {
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.78rem;
  padding: 0;
}

.local-file-actions button:hover {
  color: var(--accent);
}

/* Embedding panel */

#embedding-panel {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.section-note {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  line-height: 1.4;
}

#embedding-canvas {
  display: block;
  width: 100%;
  height: 64px;
  border-radius: 6px;
  background: var(--bg-surface);
  image-rendering: pixelated;
}

.stats-text {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-top: 6px;
}

.sidebar-footer {
  margin-top: auto;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
}

.sidebar-footer a {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
}

.sidebar-footer a:hover {
  color: var(--accent);
}

/* ─── Chat main ─────────────────────────────────────────────────────────────── */

#chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-deep);
}

#chat-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  flex-shrink: 0;
}

#header-title {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.status-badge {
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 99px;
  background: color-mix(in srgb, var(--text-muted) 20%, transparent);
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.status-badge.ready {
  background: rgb(91 223 156 / 15%); /* fallback for older browsers */
  background: color-mix(in srgb, var(--green) 15%, transparent);
  color: var(--green);
}

.status-badge.loading {
  background: rgb(245 200 66 / 15%);
  background: color-mix(in srgb, var(--yellow) 15%, transparent);
  color: var(--yellow);
}

/* ─── Messages ──────────────────────────────────────────────────────────────── */

#messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.message-row {
  display: flex;
  padding: 6px 24px;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
}

.message-row.user {
  justify-content: flex-end;
}

.message-row.assistant {
  justify-content: flex-start;
}

.bubble {
  max-width: 72%;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 0.92rem;
  line-height: 1.65;
  word-break: break-word;
}

.bubble.user {
  background: var(--accent-dim);
  color: var(--text-primary);
  border-bottom-right-radius: 4px;
}

.bubble.assistant {
  background: var(--bg-surface);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.bubble.error {
  background: #2e1a1a; /* fallback for older browsers */
  background: color-mix(in srgb, var(--red) 15%, var(--bg-surface));
  color: var(--red);
}

/* Thinking block */

.think-block {
  background: #1c2030; /* fallback for older browsers */
  background: color-mix(in srgb, var(--accent) 8%, var(--bg-surface));
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 10px;
  overflow: hidden;
}

.think-block > summary {
  padding: 8px 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.think-block > summary::-webkit-details-marker {
  display: none;
}

.think-block[open] > summary {
  color: var(--accent);
  border-bottom: 1px solid var(--border);
}

.think-content {
  padding: 10px 12px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  white-space: pre-wrap;
  line-height: 1.55;
  max-height: 320px;
  overflow-y: auto;
}

/* Code formatting */

.code-block {
  background: #0a0c12;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  overflow-x: auto;
  margin: 8px 0;
  line-height: 1.5;
  white-space: pre;
}

.inline-code {
  font-family: var(--font-mono);
  font-size: 0.84em;
  background: var(--bg-hover);
  padding: 1px 5px;
  border-radius: 4px;
  color: var(--accent-hover);
}

/* Streaming cursor */

.cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--accent);
  margin-left: 1px;
  vertical-align: text-bottom;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* ─── Input area ────────────────────────────────────────────────────────────── */

#input-area {
  padding: 14px 24px 10px;
  border-top: 1px solid var(--border);
  background: var(--bg-panel);
  flex-shrink: 0;
}

#input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  transition: border-color 0.15s;
}

#input-wrapper:focus-within {
  border-color: var(--accent);
}

#user-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.6;
  max-height: 200px;
  overflow-y: auto;
  scrollbar-width: thin;
}

#user-input::placeholder {
  color: var(--text-muted);
}

#btn-group {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

#send-btn,
#stop-btn {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, transform 0.1s;
}

#send-btn {
  background: var(--accent);
}

#send-btn:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: scale(1.05);
}

#send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#send-btn svg {
  width: 18px;
  height: 18px;
  fill: white;
}

#stop-btn {
  background: #2e1a1a; /* fallback for older browsers */
  background: color-mix(in srgb, var(--red) 20%, var(--bg-surface));
  border: 1px solid var(--red);
}

#stop-btn:hover {
  background: #3d1f1f; /* fallback for older browsers */
  background: color-mix(in srgb, var(--red) 35%, var(--bg-surface));
}

#stop-btn svg {
  width: 16px;
  height: 16px;
  fill: var(--red);
}

.input-hint {
  margin-top: 7px;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
}

/* ─── Benchmarks panel ──────────────────────────────────────────────────────── */

.bench-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 24px;
  overflow-y: auto;
  height: 100%;
}

.bench-header h1 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.bench-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.bench-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.bench-btn {
  padding: 8px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.bench-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.bench-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.bench-btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.bench-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.bench-status {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  padding: 10px 14px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.bench-results {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.bench-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.bench-table th {
  text-align: left;
  padding: 10px 14px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
}

.bench-table td {
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.bench-table tr:last-child td {
  border-bottom: none;
}

.bench-pass {
  color: var(--green);
  font-weight: 600;
}

.bench-fail {
  color: var(--red);
  font-weight: 600;
}

.bench-running {
  color: var(--yellow);
}

.bench-pending {
  color: var(--text-muted);
}

/* ─── Responsive ────────────────────────────────────────────────────────────── */

@media (width <= 640px) {
  :root {
    --sidebar-w: 0px;
  }

  #sidebar {
    display: none;
  }

  .bubble {
    max-width: 90%;
  }

  .message-row {
    padding: 6px 12px;
  }

  #chat-header,
  #input-area {
    padding-left: 14px;
    padding-right: 14px;
  }

  .bench-controls {
    flex-direction: column;
  }

  .settings-row {
    flex-direction: column;
  }
}