:root {
  --panel: rgba(12, 20, 34, 0.90);
  --panelBorder: rgba(120, 185, 255, 0.22);
  --text: #e8f1ff;
  --muted: #aec2da;
  --accent: #8fd2ff;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: "Segoe UI", "Noto Sans TC", sans-serif;
  background: radial-gradient(circle at 55% 38%, #142a46 0%, #08101d 42%, #020611 100%);
  color: var(--text);
}
#glcanvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  z-index: 1;
}
#panel {
  position: fixed;
  z-index: 3;
  left: 14px;
  top: 14px;
  width: 320px;
  max-height: calc(100vh - 28px);
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--panelBorder);
  border-radius: 14px;
  padding: 12px;
  backdrop-filter: blur(8px);
  box-shadow: 0 10px 32px rgba(0,0,0,0.35);
}
h1 { margin: 0 0 6px; font-size: 1.3rem; }
.sub { margin: 0 0 12px; color: var(--muted); line-height: 1.5; font-size: 0.92rem; }
.timelineCard {
  padding: 11px;
  border-radius: 12px;
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(143,210,255,0.14);
  margin-bottom: 12px;
}
.timelineHeader, .timelineReadout {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}
.timelineHeader span, .timelineReadout span { color: var(--muted); }
.timelineHeader span { color: var(--accent); }
#timeline { width: 100%; margin: 12px 0 2px; }
.timelineScale { display: flex; justify-content: space-between; color: #7f95ab; font-size: 0.78rem; }
.timelineReadout { margin-top: 7px; font-size: 0.9rem; }
.timelineButtons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin-top: 10px;
}

.controlCard {
  padding: 11px;
  border-radius: 12px;
  background: rgba(255,255,255,0.045);
  border: 1px solid rgba(143,210,255,0.14);
  margin-bottom: 12px;
}
.sliderRow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
}
.sliderRow label { color: var(--text); }
.sliderRow strong { color: var(--accent); min-width: 56px; text-align: right; }
.controlCard input[type="range"] { width: 100%; margin: 8px 0 2px; }
.sliderHelp {
  color: #8ea6bf;
  font-size: 0.8rem;
  line-height: 1.4;
}

.info { display: grid; grid-template-columns: 1fr; gap: 8px; margin-bottom: 12px; }
.info > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 10px;
  background: rgba(255,255,255,0.04);
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.05);
}
.info span { color: var(--muted); }
.info strong { text-align: right; }
.buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 10px; }
.buttons button:last-child { grid-column: 1 / -1; }
button {
  padding: 9px 10px;
  border-radius: 10px;
  border: 1px solid rgba(120, 185, 255, 0.25);
  background: rgba(20, 42, 70, 0.95);
  color: var(--text);
  cursor: pointer;
}
button:hover { background: rgba(28, 55, 89, 1); }
#json {
  width: 100%;
  min-height: 430px;
  resize: vertical;
  background: rgba(0,0,0,0.25);
  color: #dce9ff;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.08);
  padding: 10px;
  font-family: Consolas, monospace;
  font-size: 0.83rem;
}
#fortressLabel {
  position: fixed;
  z-index: 3;
  left: 0;
  top: 0;
  transform: translate(-50%, -50%);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(126,195,255,0.38);
  background: rgba(10, 24, 42, 0.78);
  color: #eef6ff;
  font-size: 0.92rem;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: 0 8px 20px rgba(0,0,0,0.28);
}

#insetFrame {
  position: fixed;
  z-index: 3;
  right: 18px;
  top: 18px;
  width: min(34vw, 520px);
  height: min(34vh, 340px);
  border: 1px solid rgba(126,195,255,0.38);
  border-radius: 12px;
  pointer-events: none;
  box-shadow: 0 10px 28px rgba(0,0,0,0.38);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  color: #e8f3ff;
  background: linear-gradient(to bottom, rgba(10,24,42,0.46), rgba(10,24,42,0.04) 30%, transparent);
}
#insetFrame strong { font-size: 0.98rem; }
#insetFrame span { color: #b7cbe2; font-size: 0.82rem; }
@media (max-width: 1100px) { #insetFrame { width: 360px; height: 240px; } }
@media (max-width: 900px) { #panel { width: min(92vw, 410px); } }