:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --border: #2d2d44;
  --text-primary: #e2e8f0;
  --text-secondary: #a0aec0;
  --text-muted: #718096;
  --accent-blue: #63b3ed;
  --accent-purple: #b794f4;
  --accent-green: #68d391;
  --accent-orange: #fbd38d;
  --accent-red: #fc8181;
  --accent-cyan: #76e4f7;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

/* --- Layout --- */
.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  overflow-y: auto;
  z-index: 100;
  transition: transform .3s ease, opacity .3s ease;
}

.sidebar.hidden {
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

.sidebar-header {
  padding: 20px 16px;
  border-bottom: 1px solid var(--border);
  position: relative;
}

.sidebar-hide-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .15s;
}

.sidebar-hide-btn:hover {
  color: var(--text-primary);
  border-color: var(--accent-blue);
}

.sidebar-toggle-btn {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 101;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--accent-blue);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1.1rem;
  display: none;
  align-items: center;
  justify-content: center;
  transition: all .15s;
}

.sidebar-toggle-btn:hover {
  background: var(--bg-card);
  border-color: var(--accent-blue);
}

.sidebar-toggle-btn.visible {
  display: flex;
}

.sidebar-header h1 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-blue);
  letter-spacing: 0.5px;
}

.sidebar-header .subtitle {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.sidebar nav {
  padding: 12px 0;
}

.nav-section {
  padding: 8px 16px 4px;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  font-weight: 600;
}

.nav-item {
  display: block;
  padding: 8px 16px 8px 24px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.82rem;
  border-left: 3px solid transparent;
  transition: all .15s;
}

.nav-item:hover {
  color: var(--text-primary);
  background: rgba(99, 179, 237, 0.05);
  border-left-color: var(--accent-blue);
}

.nav-item.active {
  color: var(--accent-blue);
  background: rgba(99, 179, 237, 0.08);
  border-left-color: var(--accent-blue);
  font-weight: 600;
}

.main-content {
  margin-left: 260px;
  flex: 1;
  padding: 40px 48px;
  max-width: 1400px;
  transition: margin-left .3s ease;
}

.main-content.full-width {
  margin-left: 0;
  max-width: 100%;
}

/* --- Typography --- */
h1 { font-size: 1.8rem; font-weight: 800; margin-bottom: 8px; }
h2 { font-size: 1.3rem; font-weight: 700; margin: 32px 0 12px; color: var(--accent-blue); }
h3 { font-size: 1.05rem; font-weight: 600; margin: 24px 0 8px; }
h4 { font-size: 0.9rem; font-weight: 600; margin: 16px 0 6px; color: var(--text-secondary); }
p { margin: 8px 0; color: var(--text-secondary); }

/* --- Cards --- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 16px 0;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
  margin: 16px 0;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  text-align: center;
}

.stat-card .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-blue);
}

.stat-card .label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* --- Tables --- */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  margin: 12px 0;
}

th {
  text-align: left;
  padding: 10px 12px;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 2px solid var(--border);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

tr:hover td {
  background: rgba(99, 179, 237, 0.03);
}

/* --- Code --- */
code {
  background: var(--bg-primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  color: var(--accent-cyan);
}

pre {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  font-size: 0.78rem;
  line-height: 1.5;
  margin: 12px 0;
}

pre code {
  background: none;
  padding: 0;
  color: var(--text-secondary);
}

/* --- Badges --- */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 0.68rem;
  font-weight: 600;
}

.badge-blue { background: rgba(99,179,237,0.15); color: var(--accent-blue); }
.badge-green { background: rgba(104,211,145,0.15); color: var(--accent-green); }
.badge-orange { background: rgba(251,211,141,0.15); color: var(--accent-orange); }
.badge-purple { background: rgba(183,148,244,0.15); color: var(--accent-purple); }
.badge-red { background: rgba(252,129,129,0.15); color: var(--accent-red); }

/* --- Architecture Diagram --- */
.arch-diagram {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 16px 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text-secondary);
  white-space: pre;
  overflow-x: auto;
}

/* --- Mermaid Diagrams --- */
pre.mermaid {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 16px 0;
  overflow-x: auto;
  text-align: center;
}

pre.mermaid svg {
  max-width: 100%;
  height: auto;
}

pre.mermaid-system-context {
  padding: 20px 16px;
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.tab-btn {
  padding: 10px 20px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all .15s;
}

.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--accent-blue); border-bottom-color: var(--accent-blue); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* --- Section highlight --- */
.section-page { display: none; }
.section-page.active { display: block; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; padding: 20px 16px; }
  .sidebar-toggle-btn { display: flex; }

  pre.mermaid-system-context {
    padding: 14px 8px;
  }

  pre.mermaid-system-context svg {
    min-width: 860px;
  }
}

/* --- Scroll to smooth --- */
html { scroll-behavior: smooth; }

/* --- Status indicator --- */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 6px;
}
.status-active { background: var(--accent-green); }
.status-planned { background: var(--accent-orange); }
.status-deprecated { background: var(--text-muted); }

/* --- Embedded iframe panels --- */
.embed-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.embed-header h1 { margin-bottom: 0; }

.btn-external {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  background: rgba(99,179,237,0.1);
  border: 1px solid var(--accent-blue);
  border-radius: 6px;
  color: var(--accent-blue);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 600;
  transition: all .15s;
}

.btn-external:hover {
  background: rgba(99,179,237,0.2);
}

.embed-frame {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  height: calc(100vh - 160px);
  background: var(--bg-card);
}

.full-width .embed-frame {
  height: calc(100vh - 120px);
  border-radius: 6px;
}

.embed-frame iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: none;
  background: #fff;
  border-radius: 10px;
}

.embed-frame iframe.loaded {
  display: block;
}

.embed-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.embed-placeholder .placeholder-icon {
  font-size: 3rem;
  opacity: 0.4;
}

.embed-placeholder p {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.btn-reload {
  padding: 10px 24px;
  background: var(--accent-blue);
  color: #0f0f1a;
  border: none;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all .15s;
}

.btn-reload:hover {
  background: #90cdf4;
  transform: translateY(-1px);
}

.embed-frame iframe.loaded + .embed-placeholder {
  display: none;
}

/* --- Admin panel forms --- */
.form-group { margin-bottom: 14px; }
.form-group label { display: block; font-size: 0.78rem; font-weight: 600; margin-bottom: 4px; color: var(--text-muted); }
.form-group input, .form-group select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg-primary); color: var(--text-primary); font-size: 0.88rem;
}
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--accent-blue); }

.btn { padding: 9px 16px; border: none; border-radius: 6px; font-size: 0.82rem; font-weight: 600; cursor: pointer; transition: all .15s; }
.btn-primary { background: var(--accent-blue); color: #0f0f1a; }
.btn-primary:hover { background: #90cdf4; }
.btn-secondary { background: var(--bg-primary); color: var(--text-secondary); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent-blue); color: var(--text-primary); }
.btn-danger { background: rgba(252,129,129,0.15); color: var(--accent-red); font-size: 0.78rem; padding: 6px 12px; }
.btn-danger:hover { background: rgba(252,129,129,0.25); }

.status-msg { font-size: 0.82rem; margin-top: 8px; min-height: 1.2em; }
.status-msg.err { color: var(--accent-red); }
.status-msg.ok { color: var(--accent-green); }
.status-msg.info { color: var(--accent-blue); }
.status-msg.warn { color: var(--accent-orange); }

.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.6); display: flex; align-items: center; justify-content: center; z-index: 200; }
.modal-card { width: 440px; max-width: 95vw; }

.warn-box { background: rgba(251,211,141,0.1); border: 1px solid var(--accent-orange); color: var(--accent-orange); padding: 10px 14px; border-radius: 6px; font-size: 0.82rem; margin: 12px 0; }
.key-display { background: var(--bg-primary); border: 1px solid var(--border); color: var(--accent-green); font-family: monospace; font-size: 0.82rem; padding: 14px; border-radius: 6px; word-break: break-all; margin: 8px 0; }
.code-block { background: var(--bg-primary); border: 1px solid var(--border); color: var(--text-secondary); font-family: 'JetBrains Mono', monospace; font-size: 0.78rem; padding: 14px; border-radius: 6px; white-space: pre-wrap; word-break: break-word; }

.lead { font-size: 1rem; color: var(--text-muted); margin-bottom: 24px; }
.badge-list { line-height: 2.2; }
.badge-cyan { background: rgba(118,228,247,0.15); color: var(--accent-cyan); }
.badge-muted { background: rgba(113,128,150,0.15); color: var(--text-muted); }

ul { padding-left: 20px; color: var(--text-secondary); font-size: 0.88rem; }
li { margin: 6px 0; }

/* ----------- Traceability Graph Section ----------- */
.graph-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.kbs-badge  { background: rgba(99,179,237,0.15); color: var(--accent-blue);   border: 1px solid var(--accent-blue); }
.aeta-badge { background: rgba(104,211,145,0.15); color: var(--accent-green);  border: 1px solid var(--accent-green); }

.trace-graph-container {
  display: grid;
  grid-template-columns: 280px 1fr;
  grid-template-rows: auto 1fr;
  gap: 16px;
}
.trace-query-panel { grid-row: 1 / 2; grid-column: 1 / 2; }
.trace-legend      { grid-row: 2 / 3; grid-column: 1 / 2; }
.trace-results     { grid-row: 1 / 3; grid-column: 2 / 3; min-height: 400px; }

.trace-query-group { margin-bottom: 10px; }
.trace-query-group label { display: block; font-size: 0.75rem; color: var(--text-secondary); margin-bottom: 4px; }
.trace-query-group input {
  width: 100%; padding: 6px 10px; background: var(--bg-primary);
  border: 1px solid var(--border); border-radius: 6px;
  color: var(--text-primary); font-size: 0.85rem;
}

.trace-query-buttons { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.btn-trace {
  padding: 5px 12px; font-size: 0.78rem; font-weight: 600;
  background: rgba(183,148,244,0.1); border: 1px solid var(--accent-purple);
  color: var(--accent-purple); border-radius: 6px; cursor: pointer;
  transition: background .15s;
}
.btn-trace:hover { background: rgba(183,148,244,0.22); }
.btn-trace.active { background: rgba(183,148,244,0.3); }

.btn-run {
  width: 100%; padding: 8px; font-size: 0.85rem; font-weight: 700;
  background: var(--accent-green); color: #0f0f1a;
  border: none; border-radius: 6px; cursor: pointer; transition: opacity .15s;
}
.btn-run:hover { opacity: 0.85; }

/* Chain diagram */
.chain-diagram { display: flex; flex-direction: column; gap: 0; }
.chain-node {
  padding: 6px 12px; border-radius: 6px; font-size: 0.78rem; font-weight: 600;
  text-align: center; margin: 2px 0;
}
.chain-arrow { font-size: 0.7rem; color: var(--text-muted); text-align: center; padding: 1px 0; }
.feature-node { background: rgba(251,211,141,0.2); color: var(--accent-orange); border: 1px solid var(--accent-orange); }
.ir-node      { background: rgba(252,129,129,0.15); color: var(--accent-red); border: 1px solid var(--accent-red); }
.prd-node     { background: rgba(183,148,244,0.15); color: var(--accent-purple); border: 1px solid var(--accent-purple); }
.pad-node     { background: rgba(99,179,237,0.15); color: var(--accent-blue); border: 1px solid var(--accent-blue); }
.sad-node     { background: rgba(118,228,247,0.15); color: var(--accent-cyan); border: 1px solid var(--accent-cyan); }
.sdd-node     { background: rgba(104,211,145,0.15); color: var(--accent-green); border: 1px solid var(--accent-green); }
.fn-node      { background: rgba(160,174,192,0.1); color: var(--text-secondary); border: 1px solid var(--border); }

/* Results */
.result-count { font-size: 0.75rem; color: var(--text-muted); font-weight: normal; margin-left: 6px; }
.loading-msg  { color: var(--text-muted); font-size: 0.85rem; padding: 8px 0; }

.trace-result-item {
  padding: 10px 12px; border-radius: 6px; margin-bottom: 6px;
  background: var(--bg-primary); border: 1px solid var(--border);
  font-size: 0.82rem;
}
.trace-result-item a { color: var(--accent-blue); text-decoration: none; }
.trace-result-item a:hover { text-decoration: underline; }
.trace-result-id   { font-weight: 700; color: var(--text-primary); }
.trace-result-meta { color: var(--text-muted); font-size: 0.75rem; margin-top: 3px; }
.trace-result-fns  { margin-top: 5px; font-size: 0.78rem; color: var(--accent-green); }
.trace-stat-grid   { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 8px; }
.trace-stat-item   { padding: 8px 12px; background: var(--bg-primary); border: 1px solid var(--border); border-radius: 6px; }
.trace-stat-key    { font-size: 0.72rem; color: var(--text-muted); }
.trace-stat-val    { font-size: 1.2rem; font-weight: 700; color: var(--accent-blue); }

/* Traceability Graph � new 2-column layout */
.trace-graph-container {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 16px;
  align-items: start;
}
.trace-left-col  { display: flex; flex-direction: column; gap: 0; }
.trace-right-col { min-height: 700px; }

/* ═══════════ LOGIN PAGE ═══════════ */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg-primary);
  padding: 20px;
}
.login-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 48px 40px;
  width: 100%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.login-logo {
  font-size: 3rem;
  color: var(--accent-blue);
  margin-bottom: 8px;
}
.login-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-blue);
  margin-bottom: 4px;
  letter-spacing: 1px;
}
.login-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}
.login-form { text-align: left; }

/* Login mode tabs */
.login-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 20px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.login-tab {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  border: none;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.login-tab.active {
  background: var(--accent-blue);
  color: #0f0f1a;
}
.login-tab:hover:not(.active) {
  background: var(--bg-secondary);
}

/* API key display in admin table */
.api-key-cell {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.api-key-masked {
  background: var(--bg-primary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.78rem;
  word-break: break-all;
  max-width: 260px;
  display: inline-block;
}
.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.75rem;
  padding: 2px 4px;
  opacity: 0.6;
  transition: opacity .15s;
}
.btn-icon:hover { opacity: 1; }
.login-field {
  margin-bottom: 16px;
}
.login-field label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.login-field input,
.login-field select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color .15s;
}
.login-field input:focus,
.login-field select:focus {
  outline: none;
  border-color: var(--accent-blue);
}
.login-btn {
  width: 100%;
  padding: 12px;
  background: var(--accent-blue);
  color: #0f0f1a;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: 8px;
  transition: opacity .15s;
}
.login-btn:hover { opacity: 0.9; }
.login-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.login-error {
  color: var(--accent-red);
  font-size: 0.8rem;
  margin-top: 12px;
  min-height: 20px;
  text-align: center;
}
.login-footer {
  margin-top: 24px;
  font-size: 0.7rem;
  color: var(--text-muted);
}
.login-footer code {
  color: var(--accent-blue);
  font-size: 0.7rem;
}

/* ═══════════ SIDEBAR USER / LOGOUT ═══════════ */
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}
.role-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 3px 8px;
  border-radius: 4px;
  background: rgba(99,179,237,0.15);
  color: var(--accent-blue);
}
.role-badge.role-admin { background: rgba(252,129,129,0.15); color: var(--accent-red); }
.role-badge.role-architect { background: rgba(183,148,244,0.15); color: var(--accent-purple); }
.role-badge.role-reviewer { background: rgba(251,211,141,0.15); color: var(--accent-orange); }
.role-badge.role-engineer { background: rgba(104,211,145,0.15); color: var(--accent-green); }
.role-badge.role-viewer { background: rgba(99,179,237,0.15); color: var(--accent-blue); }
.btn-logout {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: all .15s;
  margin-left: auto;
}
.btn-logout:hover {
  color: var(--accent-red);
  border-color: var(--accent-red);
}

/* ═══════════ CHATBOX ═══════════ */
.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 80px);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}
.chat-header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}
.chat-toggle-label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
}
.chat-toggle-label input[type="checkbox"] {
  accent-color: var(--accent-blue);
}
.btn-chat-clear {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .15s;
}
.btn-chat-clear:hover { color: var(--accent-red); border-color: var(--accent-red); }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.chat-msg {
  display: flex;
  gap: 10px;
  max-width: 85%;
  animation: chatFadeIn .2s ease;
}
.chat-msg-user { align-self: flex-end; flex-direction: row-reverse; }
.chat-msg-assistant { align-self: flex-start; }
.chat-avatar {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
}
.chat-bubble {
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.88rem;
  line-height: 1.6;
  word-break: break-word;
}
.chat-msg-user .chat-bubble {
  background: var(--accent-blue);
  color: #0f0f1a;
  border-bottom-right-radius: 4px;
}
.chat-msg-assistant .chat-bubble {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.chat-system-msg {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 6px 12px;
  background: rgba(99,179,237,0.05);
  border-radius: 8px;
  align-self: center;
}
.chat-typing {
  color: var(--text-muted);
  font-style: italic;
}
.chat-rag-badge {
  font-size: 0.7rem;
  color: var(--accent-green);
  margin-top: 4px;
  padding-left: 38px;
}
.chat-code {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  overflow-x: auto;
  margin: 6px 0;
  display: block;
  white-space: pre-wrap;
}
.chat-inline-code {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.82rem;
}
.chat-input-bar {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-card);
}
.chat-input {
  flex: 1;
  resize: none;
  padding: 10px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.88rem;
  line-height: 1.5;
  min-height: 42px;
  max-height: 160px;
  transition: border-color .15s;
}
.chat-input:focus { outline: none; border-color: var(--accent-blue); }
.chat-input::placeholder { color: var(--text-muted); }
.btn-chat-send,
.btn-chat-stop {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all .15s;
}
.btn-chat-send {
  background: var(--accent-blue);
  color: #0f0f1a;
}
.btn-chat-send:hover { opacity: 0.85; }
.btn-chat-stop {
  background: var(--accent-red);
  color: #fff;
}
.btn-chat-stop:hover { opacity: 0.85; }

@keyframes chatFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Cluster Dashboard ─── */
.cluster-nodes-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 12px; }
.cluster-node-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 8px; padding: 14px; }
.cluster-node-card.online { border-left: 3px solid #48bb78; }
.cluster-node-card.offline { border-left: 3px solid #fc8181; opacity: 0.6; }
.cluster-node-card.busy { border-left: 3px solid #f6e05e; }
.cluster-node-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.cluster-node-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; font-size: 0.85rem; margin-bottom: 8px; }
.cluster-node-models { display: flex; flex-wrap: wrap; gap: 4px; }
.cluster-model-tag { font-size: 0.7rem; background: var(--bg-secondary); border: 1px solid var(--border); padding: 2px 8px; border-radius: 4px; color: var(--accent-blue); }
.cluster-badge { font-size: 0.7rem; padding: 2px 8px; border-radius: 10px; text-transform: uppercase; font-weight: 600; }
.cluster-badge-online { background: #22543d; color: #48bb78; }
.cluster-badge-offline { background: #742a2a; color: #fc8181; }
.cluster-badge-busy { background: #744210; color: #f6e05e; }
.cluster-badge-running { background: #2b6cb0; color: #bee3f8; }
.cluster-badge-completed { background: #22543d; color: #48bb78; }
.cluster-badge-pending { background: #744210; color: #f6e05e; }
.cluster-badge-failed { background: #742a2a; color: #fc8181; }
.cluster-badge-assigned { background: #553c9a; color: #d6bcfa; }
.cluster-model-item { display: flex; justify-content: space-between; align-items: center; padding: 8px 12px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 6px; margin-bottom: 6px; }
.cluster-model-nodes { font-size: 0.8rem; color: var(--text-muted); }
.cluster-event-entry { padding: 2px 0; color: var(--text-secondary); font-size: 0.8rem; }
.chat-model-select { background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border); border-radius: 4px; padding: 2px 6px; font-size: 0.75rem; max-width: 140px; }