:root {
  --bg-page: #16171a;
  --bg-panel: #1c1d21;
  --border-color: #2e3036;
  --text-primary: #e5e7eb;
  --text-muted: #9aa1ad;
  --accent: #4fd1ff;

  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 1.6rem;
  --space-xl: 2.4rem;
  --radius: 4px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: var(--bg-page);
  font-family: 'Inter', sans-serif;
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
}

.stars-layer {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    radial-gradient(2px 2px at 10% 20%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.5px 1.5px at 25% 65%, rgba(255,255,255,0.35), transparent),
    radial-gradient(2px 2px at 40% 15%, rgba(255,255,255,0.45), transparent),
    radial-gradient(1.5px 1.5px at 55% 80%, rgba(255,255,255,0.3), transparent),
    radial-gradient(2px 2px at 70% 35%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.5px 1.5px at 85% 60%, rgba(255,255,255,0.35), transparent),
    radial-gradient(2px 2px at 95% 10%, rgba(255,255,255,0.45), transparent),
    radial-gradient(1.5px 1.5px at 15% 90%, rgba(255,255,255,0.3), transparent),
    radial-gradient(2px 2px at 60% 50%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1.5px 1.5px at 30% 40%, rgba(255,255,255,0.25), transparent);
  background-repeat: repeat;
  background-size: 100% 100%;
}

.app-header {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-xl) var(--space-lg) var(--space-md);
}

.app-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.4rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.03em;
  color: var(--accent);
}

.app-subtitle {
  margin: 0.5rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

.app-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 280px;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-lg) var(--space-xl);
  align-items: stretch;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-md);
  transition: border-color 0.25s ease;
}

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

.panel-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0 0 var(--space-md);
  color: var(--accent);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.placeholder-text {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.6;
  margin-top: var(--space-md);
}

.btn {
  width: 100%;
  padding: 0.7rem 0.8rem;
  background: var(--bg-page);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.12s ease, color 0.2s ease;
}

.btn:hover {
  background: rgba(79, 209, 255, 0.1);
}

.btn:active {
  transform: scale(0.96);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.random-btn {
  margin-bottom: var(--space-md);
}

.save-btn {
  margin-top: var(--space-md);
  display: block;
  max-width: 420px;
}

.control-group {
  margin-bottom: var(--space-md);
}

.control-group label {
  display: block;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.55rem;
}

.control-group input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  transition: filter 0.2s ease;
}

.control-group input[type="range"]:hover {
  filter: brightness(1.15);
}

.control-group input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.control-group input[type="color"] {
  width: 60px;
  height: 32px;
  padding: 2px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: none;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.control-group input[type="color"]:hover {
  border-color: var(--accent);
}

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

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border-color);
}

.info-row:last-of-type {
  border-bottom: none;
}

.info-label {
  color: var(--text-muted);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.info-value {
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: right;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 480px;
}

.preview-stage {
  position: relative;
  flex: 1;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.preview-stars {
  position: absolute;
  inset: 0;
}

.preview-stars .star {
  position: absolute;
  width: 3px;
  height: 3px;
  background: #ffffff;
  border-radius: 50%;
  opacity: 0.6;
  animation: twinkle 3.5s ease-in-out infinite;
}

.preview-stars .star:nth-child(1) { top: 12%; left: 18%; animation-delay: 0s; }
.preview-stars .star:nth-child(2) { top: 25%; left: 75%; animation-delay: 0.6s; }
.preview-stars .star:nth-child(3) { top: 65%; left: 10%; animation-delay: 1.2s; }
.preview-stars .star:nth-child(4) { top: 80%; left: 85%; animation-delay: 1.8s; }
.preview-stars .star:nth-child(5) { top: 15%; left: 50%; animation-delay: 2.2s; }
.preview-stars .star:nth-child(6) { top: 55%; left: 90%; animation-delay: 0.3s; }
.preview-stars .star:nth-child(7) { top: 88%; left: 40%; animation-delay: 1.5s; }
.preview-stars .star:nth-child(8) { top: 40%; left: 6%; animation-delay: 2.8s; }

@keyframes twinkle {
  0%, 100% { opacity: 0.2; transform: scale(0.8); }
  50% { opacity: 0.9; transform: scale(1.15); }
}

.planet-system {
  position: relative;
  width: 320px;
  height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.planet {
  --planet-light: #a3b8ff;
  --planet-mid: #5b8cff;
  --planet-dark: #1f2a52;
  --planet-glow: rgba(91, 140, 255, 0.35);
  position: relative;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 28%, var(--planet-light) 0%, var(--planet-mid) 45%, var(--planet-dark) 100%);
  overflow: hidden;
  z-index: 2;
  transition: width 0.4s ease, height 0.4s ease, box-shadow 0.4s ease;
}

.planet::before {
  content: "";
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.18) 0%, transparent 35%),
    radial-gradient(circle at 65% 65%, rgba(0, 0, 0, 0.28) 0%, transparent 32%);
  animation: rotate-surface 22s linear infinite;
}

.planet.atmosphere-on {
  box-shadow: 0 0 45px 14px var(--planet-glow);
}

@keyframes rotate-surface {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.ring {
  position: absolute;
  border: 2px solid rgba(143, 152, 166, 0.55);
  border-radius: 50%;
  transform: rotate(-20deg) scale(0.85);
  opacity: 0;
  z-index: 1;
  pointer-events: none;
  transition: opacity 0.35s ease, transform 0.35s ease, width 0.4s ease, height 0.4s ease;
}

.ring.active {
  opacity: 1;
  transform: rotate(-20deg) scale(1);
}

.moon {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #d5d8de 0%, #6b7280 100%);
  z-index: 3;
  opacity: 0;
  transform: scale(0.6);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.moon.active {
  opacity: 1;
  transform: scale(1);
}

.scan-overlay {
  position: absolute;
  inset: 0;
  background: rgba(79, 209, 255, 0.06);
  border-top: 1px solid rgba(79, 209, 255, 0.4);
  border-bottom: 1px solid rgba(79, 209, 255, 0.4);
  opacity: 0;
  pointer-events: none;
  z-index: 4;
  transition: opacity 0.2s ease;
}

.scan-overlay.active {
  opacity: 1;
}

.card-section {
  position: relative;
  z-index: 1;
  padding: 0 var(--space-lg) var(--space-xl);
}

.card-section .panel-title {
  margin-bottom: var(--space-md);
}

.planet-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-md);
  max-width: 420px;
  transition: border-color 0.25s ease;
}

.planet-card:hover {
  border-color: var(--accent);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--space-sm);
  margin-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-color);
}

.card-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
}

.card-rarity {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  border: 1px solid currentColor;
}

.card-rarity.rarity-common { color: #9aa0ab; }
.card-rarity.rarity-uncommon { color: #7bd88f; }
.card-rarity.rarity-rare { color: #63b3ff; }
.card-rarity.rarity-epic { color: #b98aff; }
.card-rarity.rarity-legendary { color: #ffd166; }

.card-body {
  margin-bottom: var(--space-md);
}

.card-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border-color);
}

.card-row:last-of-type {
  border-bottom: none;
}

.card-label {
  color: var(--text-muted);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.card-value {
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 500;
  text-align: right;
}

.card-description {
  color: var(--text-muted);
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 0;
}

.archive-section {
  position: relative;
  z-index: 1;
  padding: 0 var(--space-lg) var(--space-xl);
}

.archive-section .panel-title {
  margin-bottom: var(--space-md);
}

.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.archive-empty {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.archive-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: border-color 0.25s ease, transform 0.2s ease;
}

.archive-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.archive-card-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.4rem;
}

.archive-color-preview {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

.archive-name {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
}

.archive-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.archive-row span:last-child {
  color: var(--text-primary);
}

.archive-date {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.archive-delete-btn {
  width: 100%;
  margin-top: 0.7rem;
  padding: 0.4rem 0.6rem;
  background: none;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.archive-delete-btn:hover {
  border-color: #ff6b6b;
  color: #ff6b6b;
  background: rgba(255, 107, 107, 0.06);
}

.archive-delete-btn:focus-visible {
  outline: 2px solid #ff6b6b;
  outline-offset: 2px;
}

@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .preview-panel {
    order: -1;
    min-height: 360px;
  }

  .planet-card,
  .save-btn {
    max-width: 100%;
  }

  .archive-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }
}

@media (max-width: 480px) {
  .app-title {
    font-size: 1.9rem;
  }

  .app-header {
    padding: var(--space-lg) var(--space-md) var(--space-sm);
  }

  .app-layout,
  .card-section,
  .archive-section {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .archive-grid {
    grid-template-columns: 1fr;
  }
}