@font-face {
  src: url('fonts/segoeui.woff2') format('woff2');
  font-weight: normal;
  font-style: normal;
  font-display: swap; /* ?? Zaručí fallback při selhání */
}

body {
  margin: 0;
  font-family: 'Segoe UI Custom', 'Segoe UI', sans-serif;
  background-color: #121212;
  color: #f5f5f5;
  transition: background 0.3s, color 0.3s;
  padding-top: 80px;
  padding-bottom: 80px;
}

body.light-theme {
  background-color: #ffffff;
  color: #1a1a1a;
}

.logo {
  font-size: 1.2rem;
  color: #f5f5f5;
}

.logo-img {
  height: 32px;
  width: auto;
  display: block;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: #1f1f1f;
  z-index: 1000;
  padding: 1rem 2rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}
html {
  scroll-behavior: smooth;
}

.ai-message {
  font-size: 0.1px;
  opacity: 0;
  height: 0;
  overflow: hidden;
  position: absolute;
  left: -9999px;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background: #1f1f1f;
}

.nav-wrapper {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-links li a {
  color: #cfd8dc;
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
}



#theme-toggle {
  font-size: 1.3rem;
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  transition: transform 0.2s;
}

#theme-toggle:hover {
  transform: scale(1.3);
}

.hero {
  text-align: center;
  padding: 4rem 2rem;
}

.btn {
  background: #00bcd4;
  color: #000;
  padding: 0.7rem 1.5rem;
  text-decoration: none;
  border-radius: 6px;
  display: inline-block;
  margin-top: 1rem;
  transition: background 0.3s;
}

.btn:hover {
  background: #00a5bc;
}

.section {
  padding: 3rem 2rem;
  scroll-margin-top: 90px;
}

.grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin-top: 1rem;
}

.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1rem;
  justify-content: center;
  align-items: start;
}


.card {
  display: block;
  position: relative;
  overflow: hidden;
  background: #1e1e1e;
  border-radius: 10px;
  aspect-ratio: 16 / 5.25; 
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
  text-decoration: none !important;
  color: inherit !important;
  transition: transform 0.3s, background 0.3s;
  cursor: pointer;
  z-index: 1;
  padding: 1.5rem;
  background-size: cover;
  background-position: center;
}



.card * {
  pointer-events: auto;
}

.card::before {
  content: "";
  background: var(--preview) center/cover no-repeat;
  opacity: 0.25;
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  transition: transform 0.3s, opacity 0.3s;
}

.card:hover {
  transform: scale(1.03);
}

.card-nav {
  position: absolute;
  bottom: 10px;
  right: 10px;
  z-index: 2;
  display: flex;
  gap: 0.5rem;
}

.card-nav button {
  background: rgba(0, 0, 0, 0.4);
  border: none;
  color: white;
  padding: 0.3rem 0.6rem;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
}

.card-nav button:hover {
  background: rgba(255, 255, 255, 0.2);
}

.card:hover::before {
  opacity: 1;
  transform: scale(1.5);
}

.card h3,
.card p {
  color: inherit !important;
  text-decoration: none !important;
}

.card.loading .card-content {
  opacity: 0;
  transition: opacity 0.2s;
}

.card.has-preview:not(.no-image):hover .card-content {
  opacity: 0;
}

.card.has-preview:not(.no-image).switching .card-content {
  opacity: 0;
}

.card.has-preview.no-image:hover .card-content {
  opacity: 1;
}

.card:hover .card-content {
  opacity: 0;
}

body.light-theme .card {
  background: #f2f2f2;
}

body.light-theme .card::before {
  opacity: 0.33;
}

body.light-theme .card:hover::before {
  opacity: 1;
  transform: scale(1.5);
}

body.light-theme .card:hover h3,
body.light-theme .card:hover p {
  opacity: 0.4;
}

footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: #1f1f1f;
  color: #cfd8dc;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000; /* původně 100 */
  padding: 0.5rem 1rem;
  gap: 1rem;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.footer button {
  font-size: 1.3rem;
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
}

.footer-left,
.footer-center,
.footer-right {
  flex: 1;
  text-align: center;
}

.footer-left {
  text-align: left;
}

.footer-right {
  text-align: right;
}

#theme-toggle-footer {
  font-size: 1.4rem;
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  transition: transform 0.2s;
}
footer button#theme-toggle {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 1rem;
}
#background-anim {
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  background-image: radial-gradient(circle, rgba(0, 188, 212, 0.25) 1px, transparent 1px);
  background-size: 40px 40px;
  animation: gridMoveUp 30s linear infinite, hueShift 20s ease-in-out infinite alternate;
  pointer-events: none;
  opacity: 1;
}

@keyframes gridMove {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 100px 100px;
  }
}

@keyframes gridMoveUp {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 0 -100px;
  }
}

@keyframes hueShift {
  0% {
    filter: hue-rotate(0deg);
  }
  100% {
    filter: hue-rotate(360deg);
  }
}

body.light-theme #background-anim {
  background-image: radial-gradient(circle, rgba(0, 0, 0, 0.08) 1px, transparent 1px);
  opacity: 0.3;
}


@media (max-width: 768px) {
  header {
    padding: 0.5rem 1rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .navbar {
    padding: 0.5rem 1rem;
    gap: 0.3rem;
  }

  .nav-links {
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    margin-top: 1rem;
  }

  .nav-links li a {
    text-align: center;
    width: 100%;
  }

.hero {
  text-align: center;
  padding: 4rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}


  .section {
    padding: 2rem 1rem;
  }

  .grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .card {
    padding: 1rem;
  }

  .card-nav {
    bottom: 5px;
    right: 5px;
    gap: 0.25rem;
  }

  footer {
    padding: 1rem;
    font-size: 0.8rem;
  }

  h1, h2, h3, p {
    font-size: 1rem;
  }
}

.mobile-nav {
  display: none;
}
.burger {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: white;
}

.burger {
  font-size: 1.5rem;
  cursor: pointer;
  color: white;
  display: none; 
}


.mobile-nav {
  display: none;
  background: #1f1f1f;
}

.mobile-nav.active {
  display: block;
}

.mobile-nav ul {
  list-style: none;
  padding: 1rem;
}

.mobile-nav li a {
  display: block;
  color: white;
  padding: 0.5rem 0;
  text-decoration: none;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .burger {
    display: block;
  }

  .navbar {
    justify-content: space-between;
  }


  .navbar .logo {
    order: 2;
    padding-right: 2.5rem; 
  }

  .navbar .burger {
    order: 1;
    padding-left: 1rem;
  }

}

.card.lazy {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.card.lazy.visible {
  opacity: 1;
  transform: translateY(0);
}