body, html {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(135deg, #0f2027 0%, #2c5364 100%);
  overflow: hidden;
}

#solar-bg {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: 0;
  pointer-events: none;
}

canvas {
  display: block;
  position: fixed;
  top: 0; left: 0; width: 100vw; height: 100vh;
  z-index: 1;
}

.control-panel {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.45);
  border-radius: 18px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  padding: 22px 20px 16px 20px;
  min-width: 270px;
  max-width: 95vw;
  z-index: 10;
  transition: background 0.3s, width 0.3s, min-width 0.3s, padding 0.3s, max-height 0.5s cubic-bezier(0.4,0,0.2,1), opacity 0.4s;
  max-height: 900px;
  opacity: 1;
  overflow: hidden;
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1.5px solid rgba(255,255,255,0.18);
}

body.dark .control-panel {
  background: rgba(24, 28, 38, 0.55);
  color: #f3f3f3;
  border: 1.5px solid rgba(255,255,255,0.13);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
  gap: 0.7em;
}

.panel-header h2 {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: color 0.3s, transform 0.3s;
  color: inherit;
  transform: none;
  white-space: nowrap;
  overflow: hidden;
  max-width: 100%;
}

#themeToggle {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  line-height: 1;
  vertical-align: middle;
  transition: background 0.2s;
  box-shadow: none;
  padding: 0;
  margin-top: -2px;
}
#themeToggle:hover {
  background: #ececec;
}
body.dark #themeToggle:hover {
  background: #23272f;
}

#sliders {
  margin-bottom: 12px;
}
.slider-group {
  margin-bottom: 10px;
}
.slider-group label {
  display: flex;
  justify-content: space-between;
  font-size: 1rem;
  margin-bottom: 2px;
  font-weight: 500;
}
.slider-group input[type="range"] {
  width: 100%;
  accent-color: #2c5364;
  margin-top: 2px;
}
body.dark .slider-group input[type="range"] {
  accent-color: #f3c623;
}

.panel-actions {
  display: flex;
  justify-content: center;
}
#pauseResume {
  padding: 7px 18px;
  font-size: 1rem;
  border-radius: 8px;
  border: none;
  background: #2c5364;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(44,83,100,0.08);
  transition: background 0.2s;
}
#pauseResume:hover {
  background: #1a2a38;
}
body.dark #pauseResume {
  background: #f3c623;
  color: #23272f;
}
body.dark #pauseResume:hover {
  background: #ffe484;
}

.tooltip {
  position: fixed;
  pointer-events: none;
  background: rgba(30,30,40,0.97);
  color: #fff;
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  box-shadow: 0 2px 12px rgba(0,0,0,0.18);
  z-index: 100;
  opacity: 0;
  transition: opacity 0.18s, transform 0.18s;
  transform: translateY(-8px);
  white-space: nowrap;
}
.tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 600px) {
  .control-panel {
    min-width: 0;
    width: 95vw;
    left: 50% !important;
    right: auto !important;
    transform: translateX(-50%) !important;
    padding: 14px 8px 10px 8px;
  }
  .panel-header h2 {
    font-size: 1.05rem;
  }
  #pauseResume {
    font-size: 0.95rem;
    padding: 6px 10px;
  }
  .slider-group label {
    font-size: 0.95rem;
  }
}

.control-panel.collapsed {
  min-width: 320px;
  width: 320px;
  height: auto;
  padding: 22px 20px 16px 20px;
  background: rgba(255,255,255,0.45);
  border-radius: 18px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  transition: width 0.3s, min-width 0.3s, padding 0.3s, background 0.3s, max-height 0.5s cubic-bezier(0.4,0,0.2,1), opacity 0.4s;
  max-height: 120px;
  opacity: 0.97;
}
body.dark .control-panel.collapsed {
  background: rgba(24, 28, 38, 0.55);
  color: #f3f3f3;
}
.control-panel.collapsed .panel-header h2,
.control-panel.collapsed .panel-header #themeToggle {
  color: inherit;
  transform: none;
}
.control-panel.collapsed #sliders {
  opacity: 0;
  max-height: 0;
  pointer-events: none;
}
.control-panel.collapsed .panel-actions {
  width: 100%;
  display: flex;
  justify-content: center;
  margin: 0;
}
.control-panel.collapsed .panel-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0;
}
#collapsePanel {
  margin-left: 10px;
  font-size: 1.2rem;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  transition: color 0.2s;
}
#collapsePanel:hover {
  color: #f3c623;
}

/* Ensure pause/resume button is always visible in collapsed mode */
.control-panel.collapsed #pauseResume {
  display: block;
  margin: 0;
  margin-top: 0;
  padding: 7px 18px;
  font-size: 1rem;
  border-radius: 8px;
  border: none;
  background: #f3c623;
  color: #23272f;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(44,83,100,0.08);
  transition: background 0.2s;
}

/* Smooth transition for panel */
.control-panel {
  transition: background 0.3s, width 0.3s, min-width 0.3s, padding 0.3s, max-height 0.5s cubic-bezier(0.4,0,0.2,1), opacity 0.4s;
  max-height: 900px;
  opacity: 1;
  overflow: hidden;
}

/* Ensure theme toggle is always visible and clickable */
.control-panel .panel-header #themeToggle {
  display: inline-block;
}

.control-panel #sliders {
  transition: opacity 0.4s, max-height 0.5s cubic-bezier(0.4,0,0.2,1);
  opacity: 1;
  max-height: 600px;
  overflow: hidden;
}

.panel-header h2, .panel-header #themeToggle {
  transition: color 0.3s, transform 0.3s;
  color: inherit;
  transform: none;
}
.control-panel.collapsed .panel-header h2,
.control-panel.collapsed .panel-header #themeToggle {
  color: inherit;
  transform: none;
}

.control-panel.collapsed .panel-header h2 {
  white-space: nowrap;
  max-width: 100%;
}

.info-card {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  min-width: 260px;
  max-width: 90vw;
  background: rgba(255,255,255,0.45);
  border-radius: 18px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  padding: 24px 22px 18px 22px;
  z-index: 100;
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1.5px solid rgba(255,255,255,0.18);
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: #23272f;
  animation: fadeInCard 0.3s;
}
body.dark .info-card {
  background: rgba(24, 28, 38, 0.55);
  color: #f3f3f3;
  border: 1.5px solid rgba(255,255,255,0.13);
}
.info-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}
#closeInfoCard {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: inherit;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
#closeInfoCard:hover {
  background: rgba(0,0,0,0.07);
}
@keyframes fadeInCard {
  from { opacity: 0; transform: translate(-50%, -60%); }
  to { opacity: 1; transform: translate(-50%, -50%); }
}