:root {
  --bg:        #0a0c10;
  --surface:   #111318;
  --border:    #1e2330;
  --border2:   #252b3b;
  --accent:    #3b82f6;
  --accent2:   #06b6d4;
  --green:     #10b981;
  --amber:     #f59e0b;
  --red:       #ef4444;
  --purple:    #8b5cf6;
  --text:      #e2e8f0;
  --text-dim:  #64748b;
  --text-mid:  #94a3b8;
  --mono:      'JetBrains Mono', monospace;
  --sans:      'Syne', sans-serif;
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  overflow: hidden;
}

/* ── HEADER ──────────────────────────────────────────── */
header {
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: relative;
  z-index: 10;
}

.chat-line {
  margin: 2px 0;
  line-height: 1.6;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.logo-icon {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
}

.header-badges {
  display: flex;
  gap: 8px;
  align-items: center;
}

.badge {
  font-family: var(--mono);
  font-size: 10px;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--border2);
  color: var(--text-mid);
  letter-spacing: 0.05em;
}

.badge.live {
  border-color: rgba(16,185,129,0.4);
  color: var(--green);
  background: rgba(16,185,129,0.08);
}

.badge.live::before {
  content: '●  ';
  font-size: 8px;
  animation: pulse 2s infinite;
}

@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }

/* ── LAYOUT ──────────────────────────────────────────── */
.layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  height: calc(100vh - 52px);
}

/* ── GRAPH PANEL ─────────────────────────────────────── */
.graph-panel {
  position: relative;
  background: var(--bg);
  overflow: hidden;
}

#cy {
  width: 100%;
  height: 100%;
}

.graph-overlay {
  position: absolute;
  top: 14px; left: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.graph-stat {
  background: rgba(17,19,24,0.85);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 8px 12px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-mid);
  backdrop-filter: blur(8px);
  display: flex;
  gap: 8px;
  align-items: center;
}

.graph-stat strong {
  color: var(--accent2);
  font-size: 13px;
}

.graph-controls {
  position: absolute;
  bottom: 14px; left: 14px;
  display: flex;
  gap: 6px;
  pointer-events: all;
}

.ctrl-btn {
  background: rgba(17,19,24,0.9);
  border: 1px solid var(--border2);
  border-radius: 6px;
  color: var(--text-mid);
  font-family: var(--mono);
  font-size: 11px;
  padding: 6px 10px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  transition: all 0.15s;
  letter-spacing: 0.03em;
}

.ctrl-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59,130,246,0.08);
}

/* legend */
.legend {
  position: absolute;
  bottom: 14px; right: 14px;
  background: rgba(17,19,24,0.88);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 10px 14px;
  backdrop-filter: blur(10px);
  pointer-events: none;
}

.legend-title {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-mid);
  margin-bottom: 5px;
}

.legend-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* node tooltip */
.node-tooltip {
  position: absolute;
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 12px 14px;
  font-family: var(--mono);
  font-size: 11px;
  max-width: 240px;
  pointer-events: none;
  display: none;
  z-index: 100;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.tooltip-type {
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.tooltip-label {
  font-size: 13px;
  font-weight: 600;
  font-family: var(--sans);
  color: var(--text);
  margin-bottom: 8px;
}

.tooltip-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--text-mid);
  margin-bottom: 3px;
}

.tooltip-row span:last-child { color: var(--text); }

/* loading state */
.graph-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: var(--bg);
  z-index: 20;
}

.spinner {
  width: 36px; height: 36px;
  border: 2px solid var(--border2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.graph-loading p {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

/* ── CHAT PANEL ──────────────────────────────────────── */
.chat-panel {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
}

.chat-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.chat-header-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chat-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
}

.chat-subtitle {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-dim);
  letter-spacing: 0.03em;
}

.chat-model-badge {
  font-family: var(--mono);
  font-size: 9px;
  padding: 3px 7px;
  border: 1px solid rgba(139,92,246,0.4);
  border-radius: 4px;
  color: var(--purple);
  background: rgba(139,92,246,0.08);
  letter-spacing: 0.05em;
}

/* suggestions */
.suggestions {
  padding: 14px 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}

.suggestions-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 2px;
}

.suggestion-chip {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-mid);
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
  letter-spacing: 0.02em;
  line-height: 1.4;
}

.suggestion-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59,130,246,0.06);
}

/* messages */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}

.messages::-webkit-scrollbar { width: 4px; }
.messages::-webkit-scrollbar-track { background: transparent; }
.messages::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

.msg {
  display: flex;
  flex-direction: column;
  gap: 4px;
  animation: fadeUp 0.25s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.msg-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 0 2px;
}

.msg-bubble {
  padding: 10px 12px;
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.65;
  letter-spacing: 0.01em;
}

.msg.user .msg-bubble {
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.25);
  color: var(--text);
  border-radius: 8px 8px 2px 8px;
}

.msg.assistant .msg-bubble {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border2);
  color: var(--text-mid);
  border-radius: 8px 8px 8px 2px;
  white-space: pre-wrap;
}

.msg.assistant .msg-bubble.error {
  border-color: rgba(239,68,68,0.3);
  color: #fca5a5;
  background: rgba(239,68,68,0.06);
}

/* greeting message */
.msg.greeting .msg-bubble {
  background: rgba(6,182,212,0.06);
  border: 1px solid rgba(6,182,212,0.2);
  color: var(--text-mid);
  border-radius: 8px;
}

/* typing indicator */
.typing-dots {
  display: flex;
  gap: 4px;
  padding: 10px 12px;
}

.typing-dots span {
  width: 5px; height: 5px;
  background: var(--text-dim);
  border-radius: 50%;
  animation: dot-bounce 1.2s infinite;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dot-bounce {
  0%,80%,100% { transform: translateY(0); opacity: 0.4; }
  40% { transform: translateY(-4px); opacity: 1; }
}

/* input area */
.chat-input-area {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.input-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

#chatInput {
  flex: 1;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border2);
  border-radius: 8px;
  padding: 9px 12px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 11px;
  resize: none;
  outline: none;
  max-height: 100px;
  min-height: 38px;
  line-height: 1.5;
  transition: border-color 0.15s;
  letter-spacing: 0.02em;
}

#chatInput::placeholder { color: var(--text-dim); }
#chatInput:focus { border-color: var(--accent); }

#sendBtn {
  background: var(--accent);
  border: none;
  border-radius: 8px;
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s;
  color: white;
}

#sendBtn:hover { background: #2563eb; transform: scale(1.04); }
#sendBtn:disabled { background: var(--border2); cursor: not-allowed; transform: none; }

#sendBtn svg { width: 15px; height: 15px; }

.input-hint {
  margin-top: 7px;
  font-family: var(--mono);
  font-size: 9px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}