:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --text-primary: #e8e8e8;
  --text-secondary: #a8a8b3;
  --accent-primary: #4a69bd;
  --accent-secondary: #e55039;
  --border-color: #2a2a3e;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  --radius: 8px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --bg-tertiary: #e0e0e0;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --accent-primary: #2e86de;
  --accent-secondary: #ee5a24;
  --border-color: #d0d0d0;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  user-select: none;
}

.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  -webkit-app-region: drag;
}

.tab-navigation {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0;
  /* Clear macOS hiddenInset traffic lights so the first tab isn't occluded. */
  padding-left: 78px;
  -webkit-app-region: no-drag;
}

.tab-button {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  gap: 0.5rem;
  transition: var(--transition);
  -webkit-app-region: no-drag;
}

.tab-button span {
  line-height: 1;
}

.tab-button:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.tab-button.active {
  background: var(--accent-primary);
  color: white;
}

.tab-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
  -webkit-app-region: no-drag;
}

.search-button,
.theme-toggle {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.5rem;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-button:hover,
.theme-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.search-button svg,
.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.theme-icon-light,
.theme-icon-dark {
  display: none;
}

[data-theme="dark"] .theme-icon-dark {
  display: block;
}

[data-theme="light"] .theme-icon-light {
  display: block;
}

.app-main {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
  user-select: text;
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.explore-container,
.birthday-container,
.observe-container,
.objects-container,
.favorites-container,
.settings-container {
  max-width: 1200px;
  margin: 0 auto;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition);
  font-weight: 500;
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}

.btn-primary:hover {
  background: #3a59ad;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  transform: translateY(-1px);
}

input[type="text"],
input[type="number"],
input[type="date"],
select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  transition: var(--transition);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(74, 105, 189, 0.2);
}

.explore-header {
  text-align: center;
  margin-bottom: 3rem;
}

.explore-sections {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.explore-section {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.apod-controls,
.search-controls,
.epic-controls {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.apod-content {
  min-height: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.apod-image {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.apod-video {
  width: 100%;
  max-width: 800px;
  height: 450px;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.apod-title {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.apod-date {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.apod-explanation {
  line-height: 1.8;
  color: var(--text-primary);
  max-width: 800px;
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  padding: 2rem 1rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  text-align: center;
}

.loading-spinner::before {
  content: "";
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.12);
  border-top-color: var(--accent-primary, #4a9eff);
  animation: loading-spinner-rotate 0.9s linear infinite;
}

@keyframes loading-spinner-rotate {
  to { transform: rotate(360deg); }
}

[data-reduce-motion="true"] .loading-spinner::before {
  animation: none;
  border-top-color: rgba(255, 255, 255, 0.35);
}

.nasa-images-grid,
.epic-images,
.objects-grid,
.favorites-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.image-card,
.object-card,
.favorite-card {
  background: var(--bg-tertiary);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.image-card:hover,
.object-card:hover,
.favorite-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.image-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.image-card-body,
.object-card-body {
  padding: 1rem;
}

.image-card-title,
.object-card-title {
  font-weight: 600;
  margin-bottom: 0.5rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.favorite-button {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(0, 0, 0, 0.7);
  border: none;
  color: white;
  padding: 0.5rem;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
}

.favorite-button:hover {
  background: var(--accent-secondary);
}

.favorite-button.favorited {
  background: var(--accent-secondary);
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  max-width: 90%;
  max-height: 90%;
  overflow-y: auto;
  position: relative;
  padding: 2rem;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  color: var(--accent-secondary);
}

.settings-section {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.setting-item {
  margin-bottom: 1rem;
}

.setting-item label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.setting-item input[type="checkbox"] {
  margin-right: 0.5rem;
}

.setting-item small {
  display: block;
  margin-top: 0.25rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.setting-item a {
  color: var(--accent-primary);
  text-decoration: none;
}

.setting-item a:hover {
  text-decoration: underline;
}

.location-coords {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.birthday-form {
  display: flex;
  gap: 1rem;
  margin: 2rem 0;
  align-items: center;
}

.month-select,
.day-select {
  min-width: 120px;
}

.location-picker {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.observe-map {
  width: 100%;
  height: 300px;
  margin-bottom: 2rem;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-secondary);
  border: 1px solid var(--border, rgba(255, 255, 255, 0.08));
}

.observe-map .leaflet-container {
  background: #0b0f17;
  font-family: inherit;
}

.observe-map .leaflet-control-attribution {
  background: rgba(0, 0, 0, 0.6);
  color: #ccc;
}

.observe-map .leaflet-control-attribution a {
  color: #9ab;
}

[data-reduce-motion="true"] * {
  animation: none !important;
  transition: none !important;
}

/* ========== Night Vision Mode ========== */

body {
  transition: background-color 0.3s ease, color 0.3s ease;
}

.night-vision-toggle,
.theme-toggle,
.search-button {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.4rem;
  border-radius: var(--radius);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.night-vision-toggle svg,
.theme-toggle svg,
.search-button svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.night-vision-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.night-vision-toggle[aria-pressed="true"] {
  color: #ff3030;
  background: rgba(255, 0, 0, 0.12);
}

body.night-vision {
  --bg-primary: #120000;
  --bg-secondary: #1f0505;
  --bg-tertiary: #2a0808;
  --text-primary: #ff4a4a;
  --text-secondary: #b23030;
  --accent-primary: #cc1a1a;
  --accent-secondary: #ff5a5a;
  --border-color: #440000;
  --shadow: 0 4px 6px rgba(80, 0, 0, 0.6);
}

body.night-vision,
body.night-vision * {
  color-scheme: dark;
}

body.night-vision .tab-button.active {
  background: #660000;
  color: #ffdada;
}

body.night-vision a,
body.night-vision a:visited {
  color: #ff7070;
}

body.night-vision input,
body.night-vision select,
body.night-vision textarea {
  background: #1a0404;
  color: #ff5050;
  border-color: #550000;
}

body.night-vision .btn-primary,
body.night-vision button.btn-primary {
  background: #8a0000;
  color: #ffd0d0;
}

body.night-vision .btn-secondary,
body.night-vision button.btn-secondary {
  background: #2a0808;
  color: #ff5050;
  border: 1px solid #550000;
}

body.night-vision .loading-spinner {
  color: #ff4040;
}

body.night-vision .loading-spinner::before {
  border-color: rgba(120, 0, 0, 0.3);
  border-top-color: #ff3030;
}

/* Tint the Leaflet map red — the tile imagery is multi-hue, so desaturate
   then sepia+hue-rotate lands it in the deep-red range. */
body.night-vision .observe-map {
  filter: grayscale(1) sepia(1) hue-rotate(-35deg) saturate(4) brightness(0.55);
}

body.night-vision .sky-chart {
  filter: hue-rotate(-10deg) saturate(1.1);
}

/* ========== Sky Chart ========== */

.sky-chart-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
}

.sky-chart-title {
  align-self: flex-start;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.sky-chart {
  display: block;
  max-width: 100%;
  height: auto;
  background: transparent;
}

.sky-chart-updated {
  align-self: flex-end;
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  margin-top: 0.25rem;
}

/* ========== API key prompt ========== */

.apikey-prompt {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  max-width: 480px;
}

.apikey-prompt h2 {
  margin: 0;
}

.apikey-prompt .apikey-help {
  color: var(--text-secondary);
  line-height: 1.5;
}

.apikey-prompt input[type="text"] {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 0.95rem;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.apikey-prompt-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

/* ========== Objects tab extras ========== */

.section-subtitle {
  color: var(--text-secondary);
  margin: 0.25rem 0 1rem;
  font-size: 0.9rem;
}

.exoplanets-heading {
  margin-top: 2.5rem;
}

.object-card-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.track-btn {
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
}

.exo-note {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.4;
  margin-top: 0.5rem;
}

.track-highlight {
  outline: 2px solid var(--accent-primary);
  outline-offset: 4px;
  border-radius: var(--radius);
  animation: track-pulse 2s ease-out;
}

@keyframes track-pulse {
  0% { background-color: rgba(74, 105, 189, 0.25); }
  100% { background-color: transparent; }
}

/* ========== Birthday carousel ========== */

.birthday-carousel {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  min-height: 360px;
}

.birthday-slides {
  position: relative;
  min-height: 360px;
}

.birthday-slide {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateX(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
  pointer-events: none;
}

.birthday-slide.active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
  position: relative;
}

.birthday-slide img {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  display: block;
}

.birthday-video {
  padding: 2rem;
  text-align: center;
}

.birthday-info {
  padding: 1rem 1.25rem 1.5rem;
}

.birthday-year {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.birthday-info h3 {
  margin-bottom: 0.5rem;
}

.birthday-navigation {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}