/* ===== Космос — общий стиль ===== */
:root {
  --bg-deep: #050816;
  --bg-card: rgba(15, 23, 42, 0.75);
  --accent: #7c3aed;
  --accent-2: #22d3ee;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --glow: 0 0 20px rgba(124, 58, 237, 0.4);
  --radius: 16px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

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

/* Звёздный фон */
.stars {
  position: fixed;
  inset: 0;
  z-index: -2;
  background: radial-gradient(ellipse at bottom, #1b2735 0%, #090a0f 100%);
}

.stars::before,
.stars::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(2px 2px at 20px 30px, #fff, transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
    radial-gradient(1px 1px at 90px 40px, #fff, transparent),
    radial-gradient(2px 2px at 160px 120px, rgba(255,255,255,0.9), transparent),
    radial-gradient(1px 1px at 230px 80px, #fff, transparent),
    radial-gradient(2px 2px at 300px 150px, rgba(255,255,255,0.7), transparent),
    radial-gradient(1px 1px at 350px 50px, #fff, transparent),
    radial-gradient(1.5px 1.5px at 420px 180px, #fff, transparent),
    radial-gradient(1px 1px at 500px 90px, rgba(255,255,255,0.8), transparent),
    radial-gradient(2px 2px at 580px 200px, #fff, transparent);
  background-size: 600px 300px;
  animation: drift 120s linear infinite;
}

.stars::after {
  background-size: 800px 400px;
  animation-duration: 180s;
  opacity: 0.6;
}

@keyframes drift {
  from { transform: translateY(0); }
  to { transform: translateY(-300px); }
}

/* Навигация */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 8, 22, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(124, 58, 237, 0.25);
}

.nav {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  font-size: 0.95rem;
  transition: all 0.25s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
  background: rgba(124, 58, 237, 0.25);
  box-shadow: var(--glow);
}

/* Бургер */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.burger span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s;
}

/* Основной контент */
main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 1rem 4rem;
  position: relative;
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #fff 20%, var(--accent-2) 50%, var(--accent) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-block;
  padding: 0.85rem 1.8rem;
  background: linear-gradient(135deg, var(--accent), #4c1d95);
  color: #fff;
  text-decoration: none;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--glow);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(124, 58, 237, 0.6);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  box-shadow: none;
  margin-left: 0.75rem;
}

.btn-outline:hover {
  background: rgba(124, 58, 237, 0.2);
}

/* Карточки */
.section-title {
  font-size: 1.75rem;
  margin-bottom: 1.5rem;
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  margin: 0.6rem auto 0;
  border-radius: 2px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
  backdrop-filter: blur(8px);
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent);
  box-shadow: var(--glow);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: #fff;
}

.card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.card a {
  display: inline-block;
  margin-top: 1rem;
  color: var(--accent-2);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
}

.card a:hover {
  text-decoration: underline;
}

/* Контент страниц */
.content-block {
  background: var(--bg-card);
  border: 1px solid rgba(124, 58, 237, 0.15);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  backdrop-filter: blur(8px);
}

.content-block h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--accent-2);
}

.content-block p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.content-block ul {
  margin: 1rem 0 1rem 1.5rem;
  color: var(--text-muted);
}

.content-block li {
  margin-bottom: 0.4rem;
}

/* Планеты */
.planet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.planet {
  text-align: center;
  padding: 1.25rem 1rem;
  background: rgba(15, 23, 42, 0.6);
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.06);
  transition: transform 0.25s;
}

.planet:hover {
  transform: scale(1.04);
}

.planet-emoji {
  font-size: 3rem;
  display: block;
  margin-bottom: 0.5rem;
}

.planet h4 {
  color: #fff;
  margin-bottom: 0.3rem;
}

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

/* Факты */
.fact-list {
  display: grid;
  gap: 1rem;
  margin-top: 1.5rem;
}

.fact {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1rem 1.25rem;
  background: rgba(15, 23, 42, 0.5);
  border-radius: 12px;
  border-left: 3px solid var(--accent);
}

.fact-num {
  font-weight: 700;
  color: var(--accent-2);
  font-size: 1.1rem;
  min-width: 1.5rem;
}

/* Миссии */
.mission {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.5rem;
  background: rgba(15, 23, 42, 0.5);
  border-radius: 12px;
  margin-bottom: 1rem;
  border: 1px solid rgba(255,255,255,0.05);
}

.mission-year {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 70px;
}

.mission h3 {
  color: #fff;
  margin-bottom: 0.3rem;
}

.mission p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1.5rem;
  border-top: 1px solid rgba(124, 58, 237, 0.2);
  color: var(--text-muted);
  font-size: 0.9rem;
}

footer a {
  color: var(--accent-2);
  text-decoration: none;
}

/* Адаптив */
@media (max-width: 700px) {
  .burger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(5, 8, 22, 0.97);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid rgba(124, 58, 237, 0.25);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 0.75rem 1rem;
  }

  .hero {
    padding: 2rem 0.5rem 3rem;
  }

  .btn-outline {
    margin-left: 0;
    margin-top: 0.75rem;
  }

  .mission {
    flex-direction: column;
    gap: 0.5rem;
  }
}