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

:root {
  --bg:         #0d1117;
  --surface:    #161b27;
  --surface-2:  #1e2535;
  --border:     #2a3248;
  --accent:     #e07b54;
  --accent-glow:rgba(224, 123, 84, 0.18);
  --text:       #e8eaf0;
  --muted:      #8b93a7;
  --radius:     12px;
  --font:       'Inter', 'Segoe UI', Arial, sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 20px 40px;
  align-items: center;
  gap: 12px;
}

.main-content {
  max-width: 1100px;
  margin: 40px auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.section-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  transition: border-color 0.2s;
}

.section-card h2 {
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.apod-img {
  width: 100%;
  max-width: 700px;
  border-radius: var(--radius);
  display: block;
  margin: 0 auto 16px;
  box-shadow: 0 0 32px var(--accent-glow);
}

.apod-title {
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.photo-grid img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.photo-grid img:hover {
  transform: scale(1.03);
  box-shadow: 0 0 20px var(--accent-glow);
}

.asteroid-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.asteroid-list li {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.92rem;
}

.asteroid-list li .name {
  font-weight: 600;
  color: var(--text);
}

.asteroid-list li .diameter {
  color: var(--muted);
  font-size: 0.85rem;
}

.empty {
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 20px 0;
}

.main-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 4px;
  padding: 0 40px;
}

.main-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 12px 16px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.main-nav a:hover {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.flare-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.flare-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.flare-class {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 60px;
}

.flare-details {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--muted);
}

.iss-coords {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-bottom: 20px;
}

.coord-box {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.coord-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.coord-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}

.iss-note {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.iss-map-link {
  display: block;
  width: fit-content;
  margin: 0 auto;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: opacity 0.2s;
}

.iss-map-link:hover {
  opacity: 0.85;
}

.event-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.event-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.event-title {
  font-weight: 600;
  font-size: 0.92rem;
}

.event-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.event-category {
  font-size: 0.78rem;
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 20px;
  padding: 2px 10px;
}

.event-link {
  font-size: 0.82rem;
  color: var(--muted);
  text-decoration: none;
}

.event-link:hover {
  color: var(--accent);
}