/* ================= Solar System Simulator ================= */
:root {
  --bg: #04060f;
  --panel-bg: rgba(10, 15, 30, 0.82);
  --panel-border: rgba(120, 160, 255, 0.18);
  --text: #dfe7ff;
  --text-dim: #8fa0c9;
  --accent: #6ea8ff;
  --accent-2: #9f7bff;
  --halley: #7dffd4;
  --radius: 14px;
  --mono: "SF Mono", "Cascadia Code", Consolas, monospace;
}

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

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

#scene {
  position: fixed;
  inset: 0;
  display: block;
  cursor: grab;
}
#scene.dragging { cursor: grabbing; }

/* ---------------- header ---------------- */
#topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 18px;
  background: linear-gradient(180deg, rgba(4, 6, 15, 0.85), rgba(4, 6, 15, 0));
  pointer-events: none;
  z-index: 10;
}
#topbar > * { pointer-events: auto; }

.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

#panelToggle {
  font-size: 14px;
  color: var(--text-dim);
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 6px 11px;
  cursor: pointer;
  display: none;
  transition: color 0.15s, border-color 0.15s;
}

#panelToggle:hover { color: var(--text); border-color: var(--accent); }
#panel.collapsed { display: none; }

#back-arcade {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  text-decoration: none;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  border-radius: 8px;
  padding: 7px 14px;
  transition: color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

#back-arcade:hover {
  color: var(--text);
  border-color: var(--accent);
  box-shadow: 0 0 12px rgba(110, 168, 255, 0.35);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-dot {
  width: 14px; height: 14px; border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fff6d8, #ffb347 55%, #ff7b00);
  box-shadow: 0 0 14px 3px rgba(255, 170, 60, 0.55);
}
.brand h1 { font-size: 17px; font-weight: 650; letter-spacing: 0.4px; }
.brand p { font-size: 11.5px; color: var(--text-dim); margin-top: 2px; }

.clock { text-align: right; }
.clock-date {
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: #fff;
  text-shadow: 0 0 12px rgba(110, 168, 255, 0.45);
}
.clock-sub { font-size: 11px; color: var(--text-dim); font-family: var(--mono); }

/* ---------------- control panel ---------------- */
#panel {
  position: fixed;
  top: 74px;
  left: 14px;
  width: 252px;
  max-height: calc(100vh - 150px);
  overflow-y: auto;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  z-index: 20;
  scrollbar-width: thin;
  scrollbar-color: rgba(120, 160, 255, 0.3) transparent;
}

.panel-section {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(120, 160, 255, 0.1);
}
.panel-section:last-child { border-bottom: none; }

.panel-section h2 {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.6px;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.row { display: flex; gap: 8px; margin-bottom: 10px; }
.row:last-child { margin-bottom: 0; }

.btn {
  flex: 1;
  padding: 8px 10px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text);
  background: rgba(120, 160, 255, 0.1);
  border: 1px solid rgba(120, 160, 255, 0.25);
  border-radius: 9px;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}
.btn:hover { background: rgba(120, 160, 255, 0.22); }
.btn:active { transform: scale(0.97); }
.btn.primary {
  background: linear-gradient(135deg, rgba(110, 168, 255, 0.35), rgba(159, 123, 255, 0.35));
  border-color: rgba(140, 180, 255, 0.5);
}
.btn.small { padding: 5px 8px; font-size: 11px; flex: 1; white-space: nowrap; }

.slider-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  margin: 4px 0 6px;
}
.slider-value { font-family: var(--mono); color: var(--accent); font-size: 11.5px; }

input[type="range"] {
  width: 100%;
  height: 4px;
  appearance: none;
  -webkit-appearance: none;
  background: rgba(120, 160, 255, 0.25);
  border-radius: 2px;
  outline: none;
  margin-bottom: 10px;
}
input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #0a0f1e;
  box-shadow: 0 0 8px rgba(110, 168, 255, 0.7);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #0a0f1e;
  cursor: pointer;
}

.toggles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-bottom: 8px;
}
.toggle {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 12px;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}
.toggle input { accent-color: var(--accent); cursor: pointer; }
.toggle:hover span { color: var(--text); }

.hint { font-size: 10.5px; color: rgba(143, 160, 201, 0.7); line-height: 1.5; }

/* ---------------- body list ---------------- */
.body-list { display: flex; flex-direction: column; gap: 3px; }
.body-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 12.5px;
  transition: background 0.12s;
  border: 1px solid transparent;
}
.body-item:hover { background: rgba(120, 160, 255, 0.1); }
.body-item.active {
  background: rgba(120, 160, 255, 0.16);
  border-color: rgba(120, 160, 255, 0.35);
}
.body-item .swatch {
  width: 11px; height: 11px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 6px currentColor;
}
.body-item .b-name { flex: 1; font-weight: 600; }
.body-item .b-dist {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--text-dim);
}
.body-item.comet .b-name { color: var(--halley); }

/* ---------------- info card ---------------- */
#infoCard {
  position: fixed;
  top: 74px;
  right: 14px;
  width: 268px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  padding: 16px;
  z-index: 20;
}
#infoCard.hidden { display: none; }

.info-close {
  position: absolute;
  top: 10px; right: 10px;
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 1px solid rgba(120, 160, 255, 0.25);
  background: rgba(120, 160, 255, 0.1);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 11px;
}
.info-close:hover { color: #fff; background: rgba(120, 160, 255, 0.25); }

.info-head { display: flex; align-items: center; gap: 11px; margin-bottom: 12px; }
.info-swatch {
  width: 26px; height: 26px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 14px currentColor;
}
.info-head h3 { font-size: 16px; font-weight: 700; }
.info-head p { font-size: 11px; color: var(--text-dim); }

.info-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 5px 12px;
  font-size: 12px;
}
.info-grid dt { color: var(--text-dim); }
.info-grid dd {
  font-family: var(--mono);
  font-size: 11.5px;
  text-align: right;
  color: var(--text);
}

.info-note {
  margin-top: 11px;
  padding-top: 10px;
  border-top: 1px solid rgba(120, 160, 255, 0.12);
  font-size: 11px;
  line-height: 1.55;
  color: var(--text-dim);
}

/* ---------------- legend ---------------- */
#legend {
  position: fixed;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 10.5px;
  color: rgba(143, 160, 201, 0.65);
  background: rgba(4, 6, 15, 0.55);
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid rgba(120, 160, 255, 0.1);
  z-index: 10;
  white-space: nowrap;
}

/* ---------------- responsive ---------------- */
/* phone = narrow, short, FHD-portrait, 21:9-landscape, or any touch device */
@media (max-width: 860px), (max-height: 500px), (orientation: portrait) and (max-width: 1080px), (orientation: landscape) and (max-height: 1080px) and (min-aspect-ratio: 2/1), (pointer: coarse) and (max-width: 2000px) {
  #panel { width: 210px; }
  #infoCard { width: 220px; }
  .brand p { display: none; }
  #legend { display: none; }
}

/* phone = narrow, short, FHD-portrait, 21:9-landscape, or any touch device */
@media (max-width: 600px), (max-height: 500px), (orientation: portrait) and (max-width: 1080px), (orientation: landscape) and (max-height: 1080px) and (min-aspect-ratio: 2/1), (pointer: coarse) and (max-width: 2000px) {
  #topbar { padding: 10px 12px; gap: 10px; }
  #panelToggle { display: block; padding: 8px 14px; font-size: 16px; }
  .brand { gap: 8px; }
  .brand-dot { width: 10px; height: 10px; }
  .brand h1 { font-size: 13.5px; }
  .topbar-right { gap: 8px; }
  #back-arcade { padding: 6px 10px; font-size: 10.5px; letter-spacing: 1px; }
  .clock-date { font-size: 13px; }
  .clock-sub { font-size: 9.5px; }

  /* control panel becomes a collapsible bottom sheet */
  #panel {
    left: 10px;
    right: 10px;
    top: auto;
    bottom: 10px;
    width: auto;
    max-height: 46vh;
    overflow-y: auto;
  }

  /* info card becomes a bottom sheet too */
  #infoCard {
    left: 10px;
    right: 10px;
    top: auto;
    bottom: 10px;
    width: auto;
    max-height: 45vh;
    overflow-y: auto;
  }
}