body.dragging::after {
  content: "Drop a tracker JSON to visualize";
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  background: rgba(15, 20, 32, 0.85);
  border: 3px dashed var(--accent);
  pointer-events: none;
}

:root {
  --bg: #0f1420;
  --bg-panel: #161c2b;
  --bg-card: #1b2333;
  --bg-card-hover: #212b3e;
  --border: #2a3349;
  --text: #e6ebf5;
  --text-dim: #9aa6be;
  --text-faint: #6b7689;
  --accent: #4f8cff;
  --accent-2: #7c5cff;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);

  --cat-user: #4f8cff;
  --cat-bot: #2bb673;
  --cat-action: #7c5cff;
  --cat-slot: #f0a02b;
  --cat-flow: #21b8c4;
  --cat-nlu: #e0559b;
  --cat-system: #8b95a8;
  --cat-misc: #c9843c;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand .logo {
  color: var(--accent);
  font-size: 18px;
}

.brand h1 {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.2px;
}

.toolbar {
  display: flex;
  gap: 8px;
}

.btn {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}

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

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

.btn-primary:hover {
  background: #3f7af0;
}

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

.btn.active:hover {
  background: #3f7af0;
}

.layout {
  flex: 1 1 auto;
  display: flex;
  min-height: 0;
}

.input-panel {
  flex: 0 0 360px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
  min-height: 0;
}

.input-panel.hidden {
  display: none;
}

.input-panel label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-dim);
}

#tracker-input {
  flex: 1 1 auto;
  resize: none;
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  line-height: 1.5;
}

#tracker-input:focus {
  outline: none;
  border-color: var(--accent);
}

.input-actions {
  display: flex;
  gap: 8px;
}

.input-error {
  margin: 0;
  color: #ff6b6b;
  font-size: 12.5px;
  background: rgba(255, 107, 107, 0.08);
  border: 1px solid rgba(255, 107, 107, 0.3);
  border-radius: 6px;
  padding: 8px 10px;
  white-space: pre-wrap;
}

.share-status {
  margin: 8px 0 0;
  color: #4ade80;
  font-size: 12.5px;
  background: rgba(74, 222, 128, 0.08);
  border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: 6px;
  padding: 8px 10px;
  white-space: pre-wrap;
}

.view {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 20px 24px;
  min-width: 0;
}

.sender {
  margin-left: 10px;
  padding: 3px 11px;
  font-size: 12px;
  color: var(--text-dim);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 320px;
}

.events {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.msg-row {
  display: flex;
  flex-direction: column;
}

.msg-row.right {
  align-items: flex-end;
}

.msg-row.left {
  align-items: flex-start;
}

.msg {
  width: 74%;
  max-width: 74%;
  border-radius: 12px;
  overflow: hidden;
  background: transparent;
}

.msg.user {
  background: rgba(79, 140, 255, 0.10);
  border: 1px solid rgba(79, 140, 255, 0.55);
  border-bottom-right-radius: 3px;
}

.msg.bot {
  background: rgba(43, 182, 115, 0.10);
  border: 1px solid rgba(43, 182, 115, 0.5);
  border-bottom-left-radius: 3px;
}

.msg.system {
  width: 100%;
  max-width: 100%;
  background: transparent;
  border: none;
  border-radius: 0;
  opacity: 0.9;
}

.msg-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  cursor: pointer;
  user-select: none;
}

.msg-head:hover {
  background: var(--bg-card-hover);
}

.msg.system .msg-head {
  padding: 3px 8px;
  gap: 6px;
}

.msg.system .msg-head:hover {
  background: rgba(255, 255, 255, 0.02);
}

.msg-caret {
  color: var(--text-faint);
  font-size: 10px;
  width: 12px;
  text-align: center;
  transition: transform 0.12s ease;
  flex: 0 0 auto;
}

.msg.open .msg-caret {
  transform: rotate(90deg);
}

.badge {
  flex: 0 0 auto;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  padding: 2px 8px;
  border-radius: 999px;
  color: #0f1420;
  background: var(--cat-misc);
}

.badge[data-cat="user"] {
  background: var(--cat-user);
}
.badge[data-cat="bot"] {
  background: var(--cat-bot);
}
.badge[data-cat="action"] {
  background: var(--cat-action);
  color: #fff;
}
.badge[data-cat="slot"] {
  background: var(--cat-slot);
}
.badge[data-cat="flow"] {
  background: var(--cat-flow);
  color: #042;
}
.badge[data-cat="nlu"] {
  background: var(--cat-nlu);
  color: #fff;
}
.badge[data-cat="system"] {
  background: var(--cat-system);
}
.badge[data-cat="misc"] {
  background: var(--cat-misc);
  color: #fff;
}

.msg-text {
  padding: 2px 10px 8px;
  font-size: 13.5px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text);
}

.msg-key {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12.5px;
}

.msg-key .k {
  color: var(--text-faint);
}

.msg-key .v {
  color: var(--text);
}

.msg-time {
  color: var(--text-faint);
  font-size: 11.5px;
  font-variant-numeric: tabular-nums;
  flex: 0 0 auto;
}

.msg-body {
  display: none;
  border-top: 1px solid var(--border);
  padding: 12px;
  background: var(--bg);
}

.msg.open .msg-body {
  display: block;
}

.kv {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 4px 12px;
  margin-bottom: 12px;
}

.kv .k {
  color: var(--text-dim);
  font-size: 12.5px;
}

.kv .v {
  color: var(--text);
  font-size: 12.5px;
  word-break: break-word;
  white-space: pre-wrap;
}

pre.json {
  margin: 0;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  overflow-x: auto;
  font-family: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  color: #cdd6e8;
}

.empty {
  color: var(--text-dim);
  text-align: center;
  padding: 60px 20px;
}

.empty p {
  margin: 0;
}

.empty strong {
  color: var(--text);
}

.hidden {
  display: none !important;
}

@media (max-width: 720px) {
  .input-panel {
    flex-basis: 280px;
  }
  .kv {
    grid-template-columns: 110px 1fr;
  }
}