:root {
  --bg1: #0f0c29;
  --bg2: #302b63;
  --bg3: #24243e;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-strong: rgba(255, 255, 255, 0.14);
  --text: #e8ebf0;
  --muted: #b7c0d1;
  --accent: #8ab4ff;
  --accent-2: #7af0b9;
  --danger: #ff6b6b;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body {
  height: 100%;
}
body {
  margin: 0;
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 700px at 20% 10%, #3a2f80 0%, transparent 60%),
              radial-gradient(800px 600px at 80% 10%, #1f7a6a 0%, transparent 55%),
              linear-gradient(135deg, var(--bg1), var(--bg2), var(--bg3));
  background-attachment: fixed;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 22px;
  background: linear-gradient(to bottom, rgba(10, 12, 25, 0.75), rgba(10, 12, 25, 0.2));
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.topbar .title {
  font-weight: 700;
  letter-spacing: 0.5px;
}
.topbar a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 8px;
}
.topbar a:hover { color: var(--text); background: rgba(255,255,255,0.06); }

.container {
  padding: 26px;
  max-width: 1200px;
  margin: 0 auto;
}

.grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
}
@media (max-width: 960px) {
  .grid { grid-template-columns: 1fr; }
}

.card {
  background: var(--glass);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}
.card h2, .card h3 {
  margin-top: 0;
  margin-bottom: 12px;
}
.card .subtle {
  color: var(--muted);
  font-size: 13px;
  margin-top: -4px;
  margin-bottom: 12px;
}

.panel-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 640px) {
  .panel-row { grid-template-columns: 1fr; }
}

label { font-size: 13px; color: var(--muted); }
.input, select, input[type="number"], input[type="text"], textarea {
  width: 100%;
  padding: 10px 12px;
  background: rgba(0,0,0,0.25);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  outline: none;
}
textarea { min-height: 100px; resize: vertical; }

.range {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(255,255,255,0.12);
  border-radius: 999px;
  outline: none;
}
.range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px; height: 18px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: 2px solid rgba(255,255,255,0.9);
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  cursor: pointer;
}

.btn {
  appearance: none;
  border: none;
  color: #0a0e1a;
  background: linear-gradient(135deg, #b6d1ff, #7af0b9);
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 700;
  letter-spacing: 0.2px;
  cursor: pointer;
  box-shadow: 0 10px 18px rgba(0,0,0,0.25);
}
.btn:hover { filter: brightness(1.05); }
.btn:active { transform: translateY(1px); }
.btn.secondary {
  background: rgba(255,255,255,0.1);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.12);
}
.btn.danger {
  background: linear-gradient(135deg, #ff9a9e, #fad0c4);
  color: #3b0a0a;
}

.kpi {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.kpi .item {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 12px;
  text-align: center;
}
.kpi .item .val {
  font-size: 20px; font-weight: 800;
}
.kpi .item .lab {
  font-size: 12px; color: var(--muted);
}

canvas.display {
  width: 100%;
  height: 420px;
  background: rgba(0,0,0,0.25);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
}

/* Chat widget base (structure by JS) */
.cb-chat-fab {
  position: fixed;
  right: 22px; bottom: 22px;
  width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg, #8ab4ff, #7af0b9);
  border: none; cursor: pointer;
  box-shadow: 0 16px 30px rgba(0,0,0,0.35);
  color: #0a0e1a; font-weight: 800; font-size: 20px;
  z-index: 11000;
}
.cb-chat-panel {
  position: fixed;
  right: 22px; bottom: 90px;
  width: min(420px, calc(100vw - 44px));
  height: 60vh;
  min-height: 360px;
  max-height: 800px;
  display: flex; flex-direction: column;
  background: var(--glass);
  border: 1px solid rgba(255,255,255,0.1);
  backdrop-filter: blur(14px);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
  z-index: 11000;
}
.cb-chat-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.cb-chat-body {
  flex: 1;
  overflow: auto;
  padding: 12px;
  display: flex; flex-direction: column; gap: 10px;
}
.cb-msg {
  padding: 10px 12px; border-radius: 12px;
  max-width: 85%;
  white-space: pre-wrap; line-height: 1.45;
}
.cb-msg.user { align-self: flex-end; background: rgba(255,255,255,0.2); }
.cb-msg.bot { align-self: flex-start; background: rgba(0,0,0,0.25); }
.cb-chat-input {
  display: grid; grid-template-columns: 1fr auto auto;
  gap: 8px; padding: 10px; border-top: 1px solid rgba(255,255,255,0.08);
}
.cb-chat-input textarea {
  height: 64px; min-height: 64px; max-height: 150px;
}
.cb-chip {
  padding: 6px 10px; border-radius: 999px; font-size: 12px;
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
  color: var(--muted);
}

/* Per feedback: hide topbar nav links, keep only title */
.topbar nav { display: none !important; }

/* Per feedback: disable experiment-level TTS buttons (keep AI Q&A TTS only) */
#speak, #stopSpeak, #ttsStop { display: none !important; }

/* elevate experiment modals above chat */
.cb-modal, .status-overlay, #resultsModal, #loading-modal, #ai-modal, .modal, .modal-content { z-index: 12002 !important; }

/* keep chat below */
.cb-chat-fab { z-index: 12000; }
.cb-chat-panel { z-index: 12000; }

/* optional: allow overlays to capture clicks even if transparent areas overlap */
.status-overlay { pointer-events: auto; }