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

h1,
p,
ul,
ol {
  margin: 0;
}

h2 {
  margin: 0;
  margin-bottom: 8px;
}

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: #f5f5f5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 0;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("assets/backdrop.jpg") center/cover no-repeat;
  filter: blur(10px);
  transform: scale(1.1);
  z-index: -2;
}

body::after {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 18, 24, 0.7);
  z-index: -1;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 8vw;
  background: rgba(12, 16, 24, 0.75);
  backdrop-filter: blur(6px);
}

#triforce {
  width: 80px;
  height: 71px;
}
#triangle {
  content: "";
  position: relative;
  width: 0px;
  height: 0px;
  left: 20px;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-bottom: 35px solid #ffbc00;
}
#triangle:before {
  content: "";
  position: absolute;
  display: block;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-bottom: 35px solid #ffbc00;
  top: 35px;
  left: -40px;
}
#triangle:after {
  content: "";
  position: absolute;
  display: block;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-bottom: 35px solid #ffbc00;
  top: 35px;
}
#shadow {
  content: "";
  width: 0px;
  height: 0px;
  position: relative;
  z-index: -1;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-top: 35px solid #ff8c00;
  transform: rotate(60deg);
  -webkit-transform: rotate(60deg);
  -moz-transform: rotate(60deg);
  -ms-transform: rotate(60deg);
  -o-transform: rotate(60deg);
  top: 9px;
  left: -24px;
}
#shadow:before {
  content: "";
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-top: 35px solid #ff8c00;
  position: absolute;
  display: block;
  top: 0px;
  left: 0px;
}
#shadow:after {
  content: "";
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-top: 35px solid #ff8c00;
  position: absolute;
  display: block;
  top: -35px;
  left: 20px;
}

nav {
  display: flex;
  gap: 24px;
}

nav a,
nav span {
  text-transform: uppercase;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: #e8e8e8;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 6px;
  transition: background 0.3s ease;
}

nav a:hover {
  background: rgba(255, 255, 255, 0.12);
}

nav span {
  opacity: 0.4;
  cursor: not-allowed;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 40px 8vw 60px;
  gap: 32px;
}

.tab-control {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.topics {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.topics label {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
  border-radius: 999px;
  background: rgba(34, 40, 52, 0.8);
  color: #f0f0f0;
  border: 1px solid transparent;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.topics label:hover {
  background: rgba(255, 255, 255, 0.12);
}

.topics label:focus-visible {
  outline: 2px solid #f5d742;
  outline-offset: 4px;
}

.article {
  display: none;
  flex-direction: column;
  gap: 16px;
  background: rgba(17, 22, 32, 0.75);
  padding: 24px 28px;
  border-radius: 16px;
  line-height: 1.6;
}

.article figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.article img {
  width: 100%;
  border-radius: 12px;
  object-fit: cover;
}

.article figcaption {
  font-size: 0.9rem;
  text-align: center;
  color: rgba(229, 232, 239, 0.8);
}

#llm:checked ~ .topics label[for="llm"],
#code:checked ~ .topics label[for="code"],
#media:checked ~ .topics label[for="media"],
#life:checked ~ .topics label[for="life"],
#russia:checked ~ .topics label[for="russia"] {
  background: #f5d742;
  color: #1a1e26;
}

#llm:checked ~ .articles #llm-article,
#code:checked ~ .articles #code-article,
#media:checked ~ .articles #media-article,
#life:checked ~ .articles #life-article,
#russia:checked ~ .articles #russia-article {
  display: flex;
}

.media-gallery {
  display: flex;
  gap: 16px;
  align-items: stretch;
  flex-wrap: wrap;
}

.media-gallery img {
  flex: 1 1 220px;
  object-fit: cover;
}

footer {
  background: rgba(12, 16, 24, 0.8);
  padding: 20px 8vw;
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: 0.95rem;
}

footer a {
  color: #f5d742;
  text-decoration: none;
  transition: color 0.2s ease;
}

footer a:hover {
  color: #fff6a4;
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .article {
    padding: 20px;
  }
}