:root {
  --bg-color: #1f252c;
  --box-color: #2a3139;
  --button-color: #39424c;
  --button-hover: #4a5561;
  --text-color: #f1f4f7;
  --soft-text: #c4ccd4;
  --accent-color: #d8e0e8;
  --shine-color: rgba(255, 255, 255, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  background-color: var(--bg-color);
  color: var(--text-color);
  text-align: center;
}

header {
  position: relative;
  overflow: hidden;
  background: linear-gradient(rgba(31, 37, 44, 0.72), rgba(31, 37, 44, 0.82)), url("images/MESSIERMISSION.jpg");
  background-size: cover;
  background-position: center;
  padding: 5rem 1rem 4rem 1rem;
}

header h1,
header h2 {
  position: relative;
  z-index: 2;
}

header h1 {
  margin: 0;
  font-size: 3rem;
  letter-spacing: 4px;
  font-weight: bold;
  text-transform: uppercase;
  color: var(--text-color);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.45);
  animation: titleGlow 4s ease-in-out infinite;
}

header h2 {
  margin: 1rem auto 0 auto;
  max-width: 850px;
  font-size: 1rem;
  font-weight: normal;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--soft-text);
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.35);
}

.shooting-star {
  position: absolute;
  width: 140px;
  height: 3px;
  background: linear-gradient(to right, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0));
  border-radius: 999px;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.6);
  opacity: 0;
  z-index: 1;
}

.star-1 {
  top: 18%;
  left: 8%;
  transform: rotate(25deg);
  animation: shootingStar1 6s linear infinite;
}

.star-2 {
  top: 30%;
  left: 35%;
  transform: rotate(25deg);
  animation: shootingStar2 8s linear infinite;
  animation-delay: 2s;
}

.star-3 {
  top: 12%;
  left: 65%;
  transform: rotate(25deg);
  animation: shootingStar3 7s linear infinite;
  animation-delay: 4s;
}

nav {
  background-color: var(--box-color);
  padding: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

nav li {
  display: inline-block;
  margin: 0.3rem 0.4rem;
}

.nav-link {
  display: inline-block;
  text-decoration: none;
  color: var(--text-color);
  font-weight: bold;
  padding: 0.55rem 1rem;
  border-radius: 8px;
  background:
    linear-gradient(
      120deg,
      transparent 0%,
      transparent 35%,
      var(--shine-color) 50%,
      transparent 65%,
      transparent 100%
    ),
    var(--button-color);
  background-size: 250% 100%, 100% 100%;
  background-position: 200% 0, 0 0;
  transition: transform 0.2s ease, background-position 0.6s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.nav-link:hover {
  background-color: var(--button-hover);
  background-position: -40% 0, 0 0;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
}

.nav-link:active {
  transform: translateY(0);
  box-shadow: none;
}

main {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1rem;
}

section {
  background-color: var(--box-color);
  padding: 2rem;
  border-radius: 12px;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);
}

section h3 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.8rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent-color);
}

section p {
  max-width: 850px;
  margin: 0 auto 2rem auto;
  color: var(--soft-text);
}

.clouds-frame {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
  background-color: var(--button-color);
  border-radius: 10px;
}

.clouds-frame img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

figure {
  margin: 0 auto;
}

figcaption {
  margin-top: 0.75rem;
  color: var(--text-color);
  font-weight: bold;
}

.gear-list {
  width: fit-content;
  margin: 0 auto;
  padding-left: 1.5rem;
  text-align: left;
  color: var(--soft-text);
}

footer {
  background-color: var(--box-color);
  color: var(--soft-text);
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

@keyframes titleGlow {
  0% {
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.45);
    transform: scale(1);
  }

  50% {
    text-shadow: 0 2px 18px rgba(255, 255, 255, 0.2);
    transform: scale(1.02);
  }

  100% {
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.45);
    transform: scale(1);
  }
}

@keyframes shootingStar1 {
  0% {
    opacity: 0;
    transform: translate(0, 0) rotate(25deg);
  }

  8% {
    opacity: 0.9;
  }

  22% {
    opacity: 0;
    transform: translate(180px, 90px) rotate(25deg);
  }

  100% {
    opacity: 0;
    transform: translate(180px, 90px) rotate(25deg);
  }
}

@keyframes shootingStar2 {
  0% {
    opacity: 0;
    transform: translate(0, 0) rotate(25deg);
  }

  8% {
    opacity: 0.85;
  }

  24% {
    opacity: 0;
    transform: translate(160px, 80px) rotate(25deg);
  }

  100% {
    opacity: 0;
    transform: translate(160px, 80px) rotate(25deg);
  }
}

@keyframes shootingStar3 {
  0% {
    opacity: 0;
    transform: translate(0, 0) rotate(25deg);
  }

  8% {
    opacity: 0.8;
  }

  20% {
    opacity: 0;
    transform: translate(170px, 85px) rotate(25deg);
  }

  100% {
    opacity: 0;
    transform: translate(170px, 85px) rotate(25deg);
  }
}

@media (max-width: 600px) {
  nav li {
    display: block;
    margin: 0.5rem 0;
  }

  header {
    padding: 4rem 1rem 3rem 1rem;
  }

  header h1 {
    font-size: 2rem;
    letter-spacing: 2px;
  }

  header h2 {
    font-size: 0.85rem;
    letter-spacing: 1px;
  }

  section {
    padding: 1.25rem;
  }

  .clouds-frame {
    padding: 0.75rem;
  }

  .shooting-star {
    width: 90px;
  }
}