:root {
  color-scheme: dark;
  --background: radial-gradient(circle at top, #101933, #05070f 55%);
  --panel-bg: rgba(6, 12, 26, 0.8);
  --panel-border: rgba(65, 99, 160, 0.4);
  --accent: #9ad5ff;
  --error: #ff8a80;
  --text: #e4ecff;
  --muted: #9ab0d6;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--background);
  color: var(--text);
}

header,
footer {
  width: calc(100% - 24px);
  margin: 12px auto 0;
  text-align: center;
}

header h1 {
  margin: 0 0 0.2rem;
  font-size: clamp(1.45rem, 2.3vw, 2rem);
  font-weight: 600;
  letter-spacing: 0.04em;
}

header p {
  margin-top: 0;
  color: var(--muted);
}

main {
  flex: 1;
  width: calc(100% - 24px);
  margin: 12px auto;
  display: grid;
  gap: 4px;
  grid-template-columns: minmax(250px, 290px) 24px minmax(0, 1fr);
  transition: grid-template-columns 0.2s ease;
}

main.controls-collapsed {
  grid-template-columns: 0 24px minmax(0, 1fr);
}

@media (max-width: 960px) {
  main {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  main.controls-collapsed {
    grid-template-columns: 1fr;
  }
}

.controls {
  padding: 14px;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  display: grid;
  gap: 11px;
  align-content: start;
  max-height: calc(100vh - 16px);
  overflow-y: auto;
  position: sticky;
  top: 8px;
}

.controls-toggle {
  width: 24px;
  height: 64px;
  min-height: 64px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: start;
  position: sticky;
  top: 14px;
  z-index: 2;
  border-radius: 7px;
}

.controls-toggle-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.controls.collapsed {
  padding: 0;
  border-width: 0;
  overflow: hidden;
}

.controls.collapsed > * {
  display: none;
}

@media (max-width: 960px) {
  .controls-toggle {
    position: static;
    width: 44px;
    height: 30px;
    min-height: 30px;
    justify-self: start;
  }
}

.control-group {
  display: grid;
  gap: 4px;
}

.control-group.compact input {
  width: 100%;
  max-width: 140px;
}

.control-group.checkbox {
  gap: 0;
}

.control-group.checkbox label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--muted);
}

.control-group.checkbox input[type='checkbox'] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

label {
  font-size: 0.9rem;
  color: var(--muted);
}

input,
select,
button {
  font: inherit;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid rgba(120, 150, 200, 0.4);
  background: rgba(9, 18, 36, 0.7);
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus,
select:focus,
button:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(154, 213, 255, 0.25);
}

button {
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.03em;
  background: linear-gradient(135deg, rgba(33, 84, 163, 0.9), rgba(103, 169, 255, 0.6));
  border-color: rgba(120, 180, 255, 0.4);
}

button:hover {
  border-color: var(--accent);
}

.control-group input[type='range'] {
  padding: 0;
  height: 32px;
  cursor: pointer;
  accent-color: var(--accent);
}

#sky-tooltip {
  position: absolute;
  pointer-events: none;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(10, 20, 42, 0.9);
  border: 1px solid rgba(140, 190, 255, 0.45);
  color: var(--text);
  font-size: 0.85rem;
  opacity: 0;
  transform: translate(-50%, -110%);
  transition: opacity 0.15s ease;
  white-space: normal;
  max-width: 280px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: 0 10px 24px rgba(8, 18, 44, 0.45);
  z-index: 10;
}

#sky-tooltip.visible {
  pointer-events: auto;
}

#sky-tooltip .tooltip-close {
  position: absolute;
  top: 5px;
  right: 5px;
  width: 30px;
  height: 30px;
  padding: 0;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: rgba(3, 9, 22, 0.82);
  color: #dcecff;
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1;
  z-index: 2;
}

#sky-tooltip .tooltip-close:hover {
  color: #86efdf;
}

#sky-tooltip .tooltip-text {
  line-height: 1.35;
}

#sky-tooltip img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  border: 1px solid rgba(140, 190, 255, 0.25);
  box-shadow: 0 6px 14px rgba(8, 18, 44, 0.35);
}

#sky-tooltip .constellation-outline {
  width: 160px;
  height: 160px;
  align-self: center;
  border-radius: 8px;
  background: rgba(3, 9, 22, 0.88);
  border: 1px solid rgba(118, 229, 210, 0.28);
}

#sky-tooltip .wikipedia-link {
  color: #86efdf;
  font-weight: 700;
  text-decoration: underline;
  align-self: flex-start;
}

#feedback {
  min-height: 1.2rem;
  font-size: 0.9rem;
  color: var(--muted);
}

#feedback.error {
  color: var(--error);
}

.sky-container {
  position: relative;
  display: grid;
  justify-items: center;
  align-items: start;
  padding: 8px;
  border-radius: 16px;
  border: 1px solid rgba(60, 94, 156, 0.35);
  background: rgba(4, 7, 16, 0.85);
  backdrop-filter: blur(8px);
}

canvas {
  width: 100%;
  max-width: none;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at center, rgba(6, 14, 32, 0.9), rgba(1, 3, 8, 0.95));
  box-shadow: 0 0 45px rgba(24, 62, 132, 0.45);
}

.legend {
  width: 100%;
  margin-top: 8px;
  padding: 7px 10px;
  background: rgba(8, 18, 38, 0.8);
  border-radius: 12px;
  border: 1px solid rgba(60, 94, 156, 0.35);
  color: var(--muted);
  font-size: 0.75rem;
  text-align: center;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 3px 14px;
}

.legend p {
  margin: 0;
}

footer {
  margin: 0 auto 8px;
  color: rgba(160, 180, 220, 0.6);
}

footer small {
  display: block;
  padding: 5px;
}

@media (max-height: 760px) and (min-width: 961px) {
  header p,
  footer {
    display: none;
  }
}