/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #020408;
  --panel-bg: rgba(5, 12, 28, 0.85);
  --border: rgba(100, 160, 255, 0.18);
  --accent: #4a9eff;
  --accent2: #ff9f4a;
  --text: #d0e8ff;
  --muted: #5a7a9f;
  --font: "Courier New", monospace;
  --font-display: Georgia, serif;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

/* Canvas */
#canvas-container {
  position: fixed;
  inset: 0;
  z-index: 0;
}

#canvas-container canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

/* UI Overlay */
#ui {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
}

/* Header */
#header {
  position: absolute;
  top: 20px;
  left: 20px;
  width: 240px;
  pointer-events: none;
}

#header h1 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.06em;
  color: #fff;
  text-shadow: 0 0 20px rgba(74, 158, 255, 0.6);
  line-height: 1.1;
}

#header p {
  font-size: 0.68rem;
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-top: 2px;
}

#selection-display {
  margin-top: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text);
  text-transform: uppercase;
}

/* Controls Panel */
#controls-panel {
  position: absolute;
  top: 138px;
  left: 20px;
  width: 240px;
  max-height: calc(100vh - 170px);
  overflow-y: auto;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  pointer-events: all;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.control-group label {
  display: block;
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}

#date-input,
#focus-select,
#size-scale-select,
#distance-scale-select,
#moon-picker {
  width: 100%;
  background: rgba(10, 20, 45, 0.8);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.78rem;
  padding: 5px 8px;
  outline: none;
  cursor: pointer;
}

#date-input {
  margin-bottom: 6px;
}

#date-input:focus,
#focus-select:focus,
#size-scale-select:focus,
#distance-scale-select:focus,
#moon-picker:focus {
  border-color: var(--accent);
}

#today-btn,
#reset-view-btn {
  width: 100%;
  background: rgba(74, 158, 255, 0.12);
  border: 1px solid rgba(74, 158, 255, 0.3);
  border-radius: 6px;
  color: var(--accent);
  font-family: var(--font);
  font-size: 0.75rem;
  padding: 5px;
  cursor: pointer;
  transition: background 0.2s;
}

#today-btn:hover,
#reset-view-btn:hover {
  background: rgba(74, 158, 255, 0.25);
}

/* Speed buttons */
#speed-controls {
  display: flex;
  gap: 4px;
}

.speed-btn {
  flex: 1;
  background: rgba(10, 20, 45, 0.8);
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  font-family: var(--font);
  font-size: 0.65rem;
  padding: 4px 2px;
  cursor: pointer;
  transition: all 0.2s;
}

.speed-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.speed-btn.active {
  background: rgba(74, 158, 255, 0.2);
  border-color: var(--accent);
  color: var(--accent);
}

/* Toggles */
.toggles {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.78rem;
  color: var(--text);
}

.toggle input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
}

/* Info Panel */
#info-panel {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 280px;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  pointer-events: all;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: opacity 0.3s, transform 0.3s;
}

#info-panel.hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
}

#close-info {
  position: absolute;
  top: 10px;
  right: 12px;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1rem;
  cursor: pointer;
}

#close-info:hover {
  color: var(--text);
}

#info-name {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 12px;
  text-shadow: 0 0 12px rgba(74, 158, 255, 0.4);
}

#info-details {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.72rem;
  border-bottom: 1px solid rgba(100, 160, 255, 0.08);
  padding-bottom: 5px;
}

.info-row .label {
  color: var(--muted);
  flex: 1;
}

.info-row .value {
  color: var(--text);
  flex: 1;
  text-align: right;
  word-break: break-word;
}

.info-block {
  border-bottom: 1px solid rgba(100, 160, 255, 0.08);
  padding-top: 6px;
  padding-bottom: 6px;
}

.info-block .label {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  margin-bottom: 6px;
}

/* Bottom status */
#status-bar {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 12px;
  pointer-events: none;
}

#date-display,
#sim-status {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

#date-display {
  color: var(--muted);
}

#sim-status {
  color: var(--accent);
  padding: 4px 8px;
  border: 1px solid rgba(74, 158, 255, 0.25);
  border-radius: 999px;
  background: rgba(74, 158, 255, 0.08);
}

#sim-status.paused {
  color: #ffb36b;
  border-color: rgba(255, 179, 107, 0.35);
  background: rgba(255, 179, 107, 0.1);
}

/* Loading */
#loading {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  gap: 16px;
  transition: opacity 0.5s;
}

#loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 2px solid rgba(74, 158, 255, 0.15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

#loading p {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
}

/* Hint text */
.hint {
  position: absolute;
  bottom: 20px;
  right: 20px;
  font-size: 0.62rem;
  color: rgba(90, 122, 159, 0.5);
  text-align: right;
  line-height: 1.6;
  pointer-events: none;
}

/* Responsive */
@media (max-width: 900px) {
  #info-panel {
    width: 250px;
  }
}

@media (max-width: 700px) {
  #header,
  #controls-panel {
    left: 14px;
  }

  #header {
    width: 220px;
  }

  #header h1 {
    font-size: 1.05rem;
  }

  #header p,
  #selection-display {
    font-size: 0.62rem;
  }

  #controls-panel {
    top: 126px;
    width: 220px;
    padding: 14px;
  }

  #info-panel {
    top: auto;
    bottom: 70px;
    right: 14px;
    width: min(250px, calc(100vw - 28px));
    max-height: 42vh;
  }

  #status-bar {
    bottom: 14px;
    gap: 8px;
  }

  #date-display,
  #sim-status {
    font-size: 0.62rem;
    letter-spacing: 0.1em;
  }

  .hint {
    display: none;
  }
}

@media (max-width: 520px) {
  #header {
    top: 14px;
    left: 12px;
    width: calc(100vw - 24px);
  }

  #header h1 {
    font-size: 0.95rem;
  }

  #header p,
  #selection-display {
    font-size: 0.58rem;
    letter-spacing: 0.08em;
  }

  #controls-panel {
    top: 110px;
    left: 12px;
    width: calc(100vw - 24px);
    max-width: 280px;
    padding: 12px;
    gap: 12px;
  }

  #info-panel {
    left: 12px;
    right: 12px;
    width: auto;
    bottom: 60px;
    max-height: 38vh;
    padding: 16px;
  }

  #status-bar {
    width: calc(100vw - 24px);
    left: 12px;
    transform: none;
    justify-content: center;
    flex-wrap: wrap;
  }

  .speed-btn {
    font-size: 0.58rem;
    padding: 4px 1px;
  }

  .toggle {
    font-size: 0.72rem;
  }

  #focus-select,
  #size-scale-select,
  #distance-scale-select,
  #date-input,
  #today-btn,
  #reset-view-btn,
  #moon-picker {
    font-size: 0.74rem;
  }
}