:root {
  --bg-main: #071019;
  --bg-panel: rgba(12, 19, 30, 0.9);
  --bg-elevated: rgba(18, 28, 43, 0.96);
  --bg-soft: rgba(255, 255, 255, 0.04);
  --bg-strong: rgba(255, 255, 255, 0.07);
  --text-main: #edf3ff;
  --text-muted: #a1b2c8;
  --text-soft: #7f91aa;
  --accent: #7dd3fc;
  --accent-strong: #38bdf8;
  --accent-warm: #fbbf24;
  --accent-green: #34d399;
  --accent-red: #fb7185;
  --accent-violet: #a78bfa;
  --border-soft: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(125, 211, 252, 0.22);
  --shadow-soft: 0 22px 70px rgba(0, 0, 0, 0.34);
  --radius-xs: 10px;
  --radius-sm: 14px;
  --radius-md: 18px;
  --radius-lg: 22px;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --font-main: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --transition-fast: 160ms ease;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(34, 211, 238, 0.08), transparent 28%),
    radial-gradient(circle at right, rgba(167, 139, 250, 0.08), transparent 25%),
    linear-gradient(180deg, #07101a 0%, #09111a 55%, #061019 100%);
  color: var(--text-main);
  font-family: var(--font-main);
}
body { padding: 16px; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; border: 0; }
h1, h2, h3, h4, p { margin: 0; }
h1 { font-size: clamp(1.35rem, 1.8vw, 1.9rem); }
h2 { font-size: 1.05rem; }
h3 { font-size: 0.96rem; }

.page-shell { max-width: 1880px; margin: 0 auto; display: grid; gap: 16px; }
.page-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 16px;
  align-items: center;
  padding: 16px 18px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  background: rgba(8, 15, 24, 0.82);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-soft);
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: linear-gradient(160deg, rgba(125, 211, 252, 0.16), rgba(167, 139, 250, 0.18));
  border: 1px solid var(--border-strong);
}
.header-copy { display: grid; gap: 0.25rem; }
.header-copy p { color: var(--text-muted); max-width: 56ch; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-soft);
  font-size: 0.73rem;
  margin-bottom: 0.24rem;
}
.global-nav { display: flex; flex-wrap: wrap; gap: 0.45rem; justify-content: center; }
.nav-link {
  padding: 0.65rem 0.92rem;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
.nav-link:hover, .nav-link:focus-visible {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-soft);
  outline: none;
  transform: translateY(-1px);
}
.nav-link--active { color: var(--text-main); background: rgba(125, 211, 252, 0.12); border-color: var(--border-strong); }
.header-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 0.45rem; }
.chip, .status-chip, .count-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.72rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-soft);
  color: var(--text-muted);
  font-size: 0.8rem;
}
.count-pill { min-width: 2.25rem; justify-content: center; }
.status-chip--good { color: #b7f7d6; border-color: rgba(52, 211, 153, 0.22); background: rgba(16, 185, 129, 0.1); }
.status-chip--warn { color: #f8e4a5; border-color: rgba(251, 191, 36, 0.22); background: rgba(245, 158, 11, 0.12); }
.status-chip--bad  { color: #fecdd3; border-color: rgba(251, 113, 133, 0.22); background: rgba(251, 113, 133, 0.10); }

.page-grid { display: grid; gap: 16px; }
.page-grid--home {
  grid-template-columns: 320px minmax(0, 1fr) 360px;
  align-items: stretch;
  min-height: calc(100vh - 136px);
}
.panel {
  position: relative;
  min-width: 0;
  min-height: 0;
  padding: 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-soft);
  background: linear-gradient(180deg, rgba(14, 22, 34, 0.94), rgba(8, 14, 24, 0.96));
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.panel::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(255,255,255,0.035), transparent 18%);
}
.panel > * { position: relative; z-index: 1; }
.history-panel, .control-panel { display: flex; flex-direction: column; gap: 14px; }
.chat-panel { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; gap: 14px; }
.history-panel, .chat-panel, .control-panel {
  min-height: calc(100vh - 136px);
  max-height: calc(100vh - 136px);
}

.panel-top, .chat-topbar, .section-head, .message-head, .model-lane__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
}
.panel-top p, .chat-topbar p { color: var(--text-muted); }
.stack { display: grid; gap: var(--space-md); }
.stack--sm { gap: 0.7rem; }
.card, .subcard, .list-item, .metric-card {
  padding: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  background: rgba(255, 255, 255, 0.04);
  transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}
.card:hover, .subcard:hover, .list-item:hover, .metric-card:hover {
  transform: translateY(-1px);
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.055);
}
.list-item, .thread-card, .catalog-card { cursor: pointer; }
.list-item--active, .thread-card--active { border-color: var(--border-strong); background: rgba(125, 211, 252, 0.09); }
.meta { display: flex; flex-wrap: wrap; gap: 0.45rem; color: var(--text-soft); font-size: 0.8rem; }
.muted { color: var(--text-muted); }
.soft { color: var(--text-soft); }
.button-row { display: flex; flex-wrap: wrap; gap: 0.7rem; }
.button-row--compact { gap: 0.5rem; }
.button {
  padding: 0.72rem 0.95rem;
  border-radius: 12px;
  border: 1px solid var(--border-soft);
  background: rgba(255,255,255,0.05);
  color: var(--text-main);
  transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}
.button:hover, .button:focus-visible {
  outline: none;
  transform: translateY(-1px);
  border-color: var(--border-strong);
  background: rgba(255,255,255,0.08);
}
.button--primary { background: linear-gradient(180deg, rgba(56,189,248,0.24), rgba(56,189,248,0.13)); border-color: rgba(125, 211, 252, 0.38); }
.button--ghost { background: transparent; }
.input, .select, .textarea, .search {
  width: 100%;
  padding: 0.82rem 0.9rem;
  border-radius: 14px;
  border: 1px solid var(--border-soft);
  background: rgba(255,255,255,0.04);
  color: var(--text-main);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.input:focus-visible, .select:focus-visible, .textarea:focus-visible, .search:focus-visible {
  outline: none;
  border-color: var(--border-strong);
  background: rgba(255,255,255,0.06);
}
textarea { resize: vertical; }
.composer-textarea { min-height: 116px; }
.inline-field { display: grid; gap: 0.45rem; }
.field-grid, .composer-meta-grid, .metric-grid { display: grid; gap: var(--space-md); grid-template-columns: repeat(2, minmax(0, 1fr)); }
.metric-grid { margin-top: 0.7rem; }
.key-value { display: grid; gap: 0.35rem; }
.key-value strong { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-soft); }
.key-value span { color: var(--text-muted); }
.tag-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.model-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.52rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: rgba(255,255,255,0.04);
}
.model-toggle--active { border-color: var(--border-strong); background: rgba(125, 211, 252, 0.1); }
.block-gap { margin-top: 0.7rem; }

.history-block { display: grid; gap: 0.8rem; min-height: 0; }
.history-block--grow { flex: 1 1 auto; min-height: 0; }
.thread-list { display: grid; gap: 0.7rem; min-height: 0; }
.thread-list--grow { overflow: auto; padding-right: 0.25rem; align-content: start; }
.thread-card { display: grid; gap: 0.45rem; }
.thread-card strong { font-size: 0.94rem; }
.thread-card small { color: var(--text-soft); }
.thread-card__footer { display: flex; justify-content: space-between; gap: 0.5rem; align-items: center; }
.thread-card__badges { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.45rem;
  border-radius: 999px;
  font-size: 0.72rem;
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--text-soft);
  background: rgba(255,255,255,0.04);
}
.badge--active { color: #d8f2ff; border-color: rgba(125,211,252,0.22); background: rgba(56,189,248,0.12); }
.badge--branch { color: #ddd6fe; border-color: rgba(167,139,250,0.25); background: rgba(167,139,250,0.1); }

.chat-stream {
  min-height: 0;
  overflow: auto;
  display: grid;
  align-content: start;
  gap: 1rem;
  padding-right: 0.3rem;
}
.message { display: grid; gap: 0.5rem; max-width: min(78%, 920px); }
.message--user { justify-self: end; }
.message-head { color: var(--text-soft); font-size: 0.8rem; }
.message__bubble {
  padding: 1rem;
  border-radius: 18px;
  border: 1px solid var(--border-soft);
  background: rgba(255,255,255,0.05);
  line-height: 1.6;
  white-space: pre-wrap;
}
.message--user .message__bubble { background: rgba(56, 189, 248, 0.11); border-color: rgba(125, 211, 252, 0.2); }
.message--system { max-width: 100%; }
.message--system .message__bubble { background: rgba(255,255,255,0.03); border-style: dashed; }
.model-lane { display: grid; gap: 0.7rem; }
.model-lane__header { color: var(--text-muted); font-size: 0.82rem; }
.model-lane__header strong { color: var(--text-main); }
.model-nest { margin-left: 1.1rem; padding-left: 1rem; border-left: 1px dashed rgba(125,211,252,0.25); display: grid; gap: 0.7rem; }
.model-commentary { background: rgba(255,255,255,0.035); border: 1px dashed rgba(125,211,252,0.18); border-radius: 14px; padding: 0.85rem; }

.composer-shell {
  display: grid;
  gap: 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(255,255,255,0.07);
}
.composer-actions {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: center;
}
.composer-hint { color: var(--text-soft); font-size: 0.82rem; }

.control-stack { min-height: 0; overflow: auto; display: grid; gap: 0.9rem; padding-right: 0.2rem; }
.dock-card {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.035);
  overflow: hidden;
}
.dock-card > summary {
  list-style: none;
  cursor: pointer;
  padding: 0.95rem;
}
.dock-card > summary::-webkit-details-marker { display: none; }
.dock-card > summary::after {
  content: "+";
  float: right;
  color: var(--text-soft);
  font-size: 1rem;
  margin-left: 0.75rem;
}
.dock-card[open] > summary::after { content: "−"; }
.dock-body { padding: 0 0.95rem 0.95rem; }
.catalog-list { padding-top: 0.9rem; }
.option-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.7rem;
  align-items: start;
}
.option-card input { accent-color: var(--accent-strong); margin-top: 0.25rem; }
.surface-contract { display: grid; gap: 0.8rem; }
.surface-contract section { display: grid; gap: 0.35rem; }
.surface-contract ul { margin: 0; padding-left: 1rem; color: var(--text-muted); display: grid; gap: 0.28rem; }
.progress { height: 10px; border-radius: 999px; background: rgba(255,255,255,0.06); overflow: hidden; }
.progress > span { display: block; height: 100%; border-radius: inherit; background: linear-gradient(90deg, rgba(125, 211, 252, 0.75), rgba(167, 139, 250, 0.75)); }
.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  padding: 0.9rem 1rem;
  border-radius: 14px;
  border: 1px solid var(--border-strong);
  background: rgba(17,24,39,0.96);
  color: var(--text-main);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 1000;
}
.toast.is-visible { opacity: 1; transform: translateY(0); }
.footer-note { color: var(--text-soft); text-align: center; font-size: 0.84rem; padding: 0 0.5rem 0.6rem; }

.empty-state {
  padding: 0.95rem;
  border-radius: var(--radius-md);
  border: 1px dashed rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.025);
  color: var(--text-muted);
}

@media (max-width: 1480px) {
  .page-grid--home { grid-template-columns: 300px minmax(0, 1fr) 330px; }
}
@media (max-width: 1320px) {
  .page-header { grid-template-columns: 1fr; }
  .field-grid, .composer-meta-grid, .metric-grid { grid-template-columns: 1fr; }
}
@media (max-width: 1100px) {
  body { padding: 12px; }
  .page-grid--home {
    grid-template-columns: 1fr;
    min-height: auto;
  }
  .history-panel, .chat-panel, .control-panel {
    min-height: auto;
    max-height: none;
  }
  .thread-list--grow, .control-stack, .chat-stream { max-height: none; }
}
@media (max-width: 780px) {
  .composer-actions, .panel-top, .chat-topbar, .section-head { flex-direction: column; align-items: stretch; }
  .message { max-width: 100%; }
}