body {
    font-family: Arial, sans-serif;
    margin-left: 10rem;
    padding: 20px;
    max-width: 80%;
    place-items: center;
    background-color: #191919;
}


.video-title {
  position: absolute;
  top: 50%;         
  left: 50%;            
  transform: translate(-50%, -50%);
  color: #e9f1fb; 
  font-size: 3rem;
  font-weight: bold;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8); 
  text-align: center;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-style: italic;
  z-index: 1;   
  margin-top: -45rem;
}


.p-left, .p-right, .p {
    font-size: 22px;
    line-height: 1.8;
    color: #e0e0e0; 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    text-align: justify;
    margin-bottom: 5rem;
    text-indent: 50px;
    
}

.p-left {
    margin: 150px 90px 0 90px;
    margin-right: 34rem;
}

.image-right {
    max-width: 40%;
    display: flex; 
    justify-content: flex-end;
    float: right;
    height: 36rem;
    margin-bottom: 20px;
    margin-left: 4rem;
    margin-top: 9.5rem;
    box-shadow: 0 4px 15px rgba(81, 0, 212, 0.322);
}



body.dark-mode h1 { color: #9ec8ff; }
body.dark-mode p { color: #e0e0e0; }
body.dark-mode button {
    background-color: #ffffff;
    color: #000000;
}

.fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}



.nav-links {
    list-style: none;
    padding: 0;
}

.nav-links li {
    display: inline;
}

.nav-links a {
    text-decoration: none;
    color: #d9dde2;
}
.nav-links a:hover {
    text-decoration: underline;
}

.nav-link {
    position: revert;
}


nav {
    position: fixed; 
    top: 0;
    left: 0;
    width: 100%;
    background: #222;
    z-index: 1000;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    position: relative;
}

nav ul li a {
    display: block;
    padding: 1rem 1.5rem;
    color: #dab9e9;
    text-decoration: none;
    font-weight: bold;
}

nav ul li a:hover {
    background: #333;
}


nav ul .dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: #222;
    list-style: none;
    padding: 0;
    margin: 0;
    min-width: 180px;
    border-radius: 0 0 6px 6px;
}

nav ul .dropdown-menu li a {
    padding: 0.8rem 1.2rem;
    white-space: nowrap;
}

nav ul li:hover .dropdown-menu {
    display: block;
}

nav {
    font-size: 1.6rem;
   padding: 1rem;

}

.uzay video {
  width: 100%;    
  max-width: 70rem; 
  height: auto;     
  display: block;
  margin: 0 auto; 
  margin-top: 5rem;
  margin-bottom: 6rem;
  box-shadow: 0 8px 25px rgba(0, 120, 212, 0.4);

}


h2 {
    font-size: 2.5rem;
    text-align: center;
    margin: 3rem 0 2rem 0;
    background: linear-gradient(45deg, #00bcd4, #9c27b0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    }




.p-son-text {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #e0e0e0;
    font-size: 18rem;
    line-height: 1.8;
    text-align: center;
    padding: 5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 50px; 
    margin-bottom: 2rem;
    margin-top: 2rem;
}
.navigation-section {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 3rem 2rem;
    text-align: center;
}

.navigation-section h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    background: linear-gradient(45deg, #00bcd4, #9c27b0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.topic-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    padding: 2rem;
    transition: all 0.3s ease;
    text-align: center;
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 188, 212, 0.3);
    border-color: rgba(0, 188, 212, 0.5);
}

.topic-card h4 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: #00bcd4;
}

.topic-card p {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    color: #e0e0e0;
}

.topic-link {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background: linear-gradient(45deg, #00bcd4, #9c27b0);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.topic-link:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0, 188, 212, 0.4);
}

.home-card {
    background: rgba(156, 39, 176, 0.1);
}

.home-link {
    background: linear-gradient(45deg, #9c27b0, #00bcd4);
}

footer {
    text-align: center;
    padding: 1rem 0;
    color: #6a6b6d;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}


@media screen and (max-width: 768px) {
   body {
        margin-left: 0;
        max-width: 100%;
    }

    h1 {
        font-size: 2rem;
        margin-top: 10rem;
        margin-bottom: 2rem;
    }
    nav {
    width: 100%;
    font-size: 1.2rem;
    padding: 1rem;
    background: #333;

}

    .video-section {
        position: absolute;
       height: 30rem;
       margin-bottom: 20rem;


    }

    .video-section video {
        width: 100%;
        height: 100%;
        margin-top: 3.5rem;
        

    }

    .video-title {
        position: absolute;           
        left: 50%; 
        transform: translate(-50%, -50%);
        font-size: 1.2rem;    
        text-align: center;
        color: #e9f1fb;
        font-weight: bold;
        font-style: italic;
        text-shadow: 2px 2px 6px black;
        z-index: 10;
        margin-top: -9rem;    
    }

    
    h2 {
        font-size: 1.2rem;
        text-align: center;
        margin-top: 25rem;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        background: linear-gradient(45deg, #00bcd4, #9c27b0);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        }

    .p-left, .p-right, .p {
        margin: 1rem;
        font-size: 16px;
        line-height: 1.5;
        text-indent: 20px;
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }

    .image-right {
        max-width: 80%;
        height: 20rem;
        margin: 2rem auto;
        margin-left: 0;
        margin-right: 0;
        margin-top: 2rem;
        margin-bottom: 3rem;
    }

    .navigation-section {
    padding: 2rem 1rem;
}

.navigation-section h3 {
    font-size: 1.5rem;
}

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

.topic-card {
    padding: 1.5rem;
}

.topic-card h4 {
    font-size: 1.2rem;
}

.gif {
    max-width: 50%;
    display: flex;
    justify-content: flex-end;
    float: right;
    margin-left: 15rem;

}

.footer {
    margin-top: 5rem;
    font-size: 0.9rem;
        padding: 0.5rem 0;
    }
}