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

html{
    min-height: 100%;
    background: #15171c;
}

body{
    min-height: 100%;
    margin: 0;
    font-family: 'Times New Roman', Times, serif;
    position: relative;
}

body::before{
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image: url(b35fef11-eb5c-4227-a863-4207255b3711.png);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

html, body {
    overscroll-behavior-y: contain;
}



.container button{
    border-radius: 50%;
    padding: 0;
    display: flex;
    border: none;
}


.container img{
    display: block;
border-radius: 50%;
width: 250px;
height: 250px;
}

nav{
    background-color:#1a1a1a;
     display: flex;
  justify-content: space-between;
  align-items: center;
  height: 60px;
  position: sticky;
  z-index: 100;
  top: 0;
   padding: 15px 25px;
}

.nav-links {
  list-style: none; 
  display: flex;
  gap: 20px; 
}

.nav-links a {
  color: #fff;
  text-decoration: none;
  font-size: 18px;
  transition: color 0.3s ease;
  font-family:'Times New Roman', Times, serif ;
}

.nav-links a:hover {
  color:dimgray; 
}

.swiper {
  width: 100%;
  height: 590px;
  overflow: hidden;
  border-bottom-left-radius: 2%;
  border-bottom-right-radius: 2%;
}

.swiper-slide {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.swiper-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.text-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: clamp(20px, 5vw, 40px);
  box-sizing: border-box;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.85) 0%,
    rgba(0, 0, 0, 0.4) 60%,
    rgba(0, 0, 0, 0) 100%
  );
  color: #ffffff;
  z-index: 2;
}

.text-overlay h2 {
  margin: 0 0 8px 0;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-family: 'Times New Roman', Times, serif;
  text-align: left; 
  line-height: 1.2;
}

.text-overlay p {
  margin: 0;
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  font-family: system-ui, -apple-system, sans-serif; 
  line-height: 1.5;
  max-width: 800px;
  color: rgba(255, 255, 255, 0.9);
}

.text-overlay a {
  color: #93c5fd;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.text-overlay a:hover {
  color: #ffffff;
}

.swiper-pagination {
  bottom: 16px !important;
}

.swiper-pagination-bullet {
  width: 10px;
  height: 10px;
  background: #ffffff;
  opacity: 0.5;
  transition: all 0.3s ease;
}

.swiper-pagination-bullet-active {
  opacity: 1;
  width: 28px; 
  border-radius: 6px;
  background: #ffffff;
}

.swiper-button-next,
.swiper-button-prev {
  color: #ffffff;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(4px); 
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}

.swiper-button-next:hover,
.swiper-button-prev:hover {
  background: rgba(0, 0, 0, 0.7);
  transform: scale(1.08);
}

.swiper-button-next::after,
.swiper-button-prev::after {
  font-size: 16px;
  font-weight: bold;
}


h1{
    text-align: center;
    margin: 30px;
    font-size: 70px;
    color:#fff;
    font-family:'Times New Roman', Times, serif;
}

h2{
    text-align: center;
    margin: 30px;
    font-size: 30px;
    color:#fff;
    font-family:'Times New Roman', Times, serif;
}

h3{
    text-align: center;
    margin: 30px;
    font-size: 30px;
    color:#fff;
    font-family:'Times New Roman', Times, serif;
}

.container{
    display: grid;
    grid-template-columns: repeat(3,1fr);
    gap: 70px;
    max-width: 1100px;
    margin: 0 auto;
    justify-items: center;
}

footer{
    background-color:dimgrey;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    bottom: 0;
    width: 100%;
    margin-top: 40px;
    font-family:'Times New Roman', Times, serif;
    font-size: 17px;
}

footer a{
    color: #fff;
     text-decoration: none;
  font-size: 17px;
  transition: color 0.3s ease;
  font-family:'Times New Roman', Times, serif ;
}

footer a:hover{
color:black;
}

.cube-button{
position: relative;
padding: 0;
border: none;
overflow: hidden;
border-radius: 50%;
cursor: pointer;
}

.cube-button:hover .overlay{
    opacity: 1;
}

.overlay{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.overlay span{
    color: white;
    font-size: 20px;
    font-weight: bold;
}


.algorithm-button{
    border-radius: 10%;
    padding: 0;
    display: flex;
    border: none;
}


.algorithms-container img{
    display: block;
border-radius: 10%;
width: 250px;
height: 250px;
}

.algorithms-container{
    display: grid;
    grid-template-columns: repeat(2,1fr);
    gap: 70px;
    max-width: 1000px;
    margin: 0 auto;
    justify-items: center;
}

.algorithm-button{
position: relative;
padding: 0;
border: none;
overflow: hidden;
border-radius: 10%;
cursor: pointer;
}

.algorithm-button:hover .overlay{
    opacity: 1;
}

.lang {
    max-width: 1000px; 
    margin: 0 auto 40px auto;
    padding: 0 20px;
}

.lang img {
    width: 100%;
    height: auto; 
    border-radius: 16px;
}

.algp h2{
    text-align: center;
    margin: 30px;
    font-size: 70px;
    color:#fff;
    font-family:'Times New Roman', Times, serif;
}
/* boll */
.card-container {
  display: grid;
  grid-template-columns: repeat(3,auto);
  gap: 200px;
  row-gap: 100px;
  justify-content: center;
  padding-top: 40px;
  font-family: 'Times New Roman', Times, serif;
}

.card {
  background-color:ghostwhite;
  border-radius: 10%;
  overflow: hidden; 
  display: flex;
  flex-direction: column;
  width: 180px; 
  margin: 0 auto;   
}


.card img {
  width: 100%;       
  height: 150px;     
  object-fit: cover; 
  display: block;    
}


.card p {
  padding: 15px;
  margin: 0;
  font-size: 0.95rem;
  color:black;
  line-height:1;
  text-align: center;
  flex-grow: 1;
  font-size: 20px;
  background-color:white;
}

.card-container .card:last-child {
  grid-column: 2;
}

/* bpll */
.card-container1 {
  display: grid;
  grid-template-columns: repeat(2,auto);
  gap: 250px;
  row-gap: 100px;
  justify-content: center;
  padding-top: 40px;
  font-family: 'Times New Roman', Times, serif;
}

/* pll */
 .card-container2 {
  display: grid;
  grid-template-columns: repeat(3,auto);
  gap: 200px;
  row-gap: 100px;
  justify-content: center;
  padding-top: 40px;
  font-family: 'Times New Roman', Times, serif;
}



 :root{
    --bg:#121218;
    --panel:#1a1a22;
    --line:#33333e;
    --text:#e9e9ee;
    --muted:#8a8a96;
    --white:#f2f2f2;
    --red:#e5484d;
    --blue:#3b82f6;
    --green:#22c55e;
    --yellow:#eab308;
    --orange:#f97316;
  }


  .timeline-nav{
    position:fixed;
    top:50%;
    left:28px;
    transform:translateY(-50%);
    display:flex;
    flex-direction:column;
    align-items:center;
    z-index:10;
  }

  .timeline-nav a{
    position:relative;
    display:flex;
    align-items:center;
    text-decoration:none;
  }

  .timeline-nav a:not(:last-child)::after{
    content:"";
    position:absolute;
    top:100%;
    left:50%;
    transform:translateX(-50%);
    width:2px;
    height:26px;
    background:var(--line);
  }

  .thumb{
    position:relative;
    width:40px;
    height:40px;
    border-radius:6px;
    overflow:hidden;
    border:2px solid var(--line);
    transition:border-color .25s ease, transform .25s ease;
  }

  .thumb img{
    display:block;
    width:100%;
    height:100%;
    object-fit:cover;
  }

  .thumb::after{
    content:"";
    position:absolute;
    inset:0;
    background:rgba(255,255,255,0);
    transition:background .2s ease;
  }

  .timeline-nav a:hover .thumb::after{
    background:rgba(255,255,255,.18);
  }

  .timeline-nav a.active .thumb{
    border-color:var(--text);
    transform:scale(1.08);
  }

  .timeline-nav a:not(:last-child){
    margin-bottom:26px;
  }

  .labels{
    position:absolute;
    left:50px;
    top:50%;
    transform:translateY(-50%);
    white-space:nowrap;
    font-size:12px;
    letter-spacing:.02em;
    color:var(--muted);
    opacity:0;
    pointer-events:none;
    transition:opacity .2s ease, transform .2s ease;
  }

  .timeline-nav a:hover .labels,
  .timeline-nav a.active .labels{
    opacity:1;
    transform:translateY(-50%) translateX(2px);
  }

  .timeline-nav a.active .labels{
    color:var(--text);
    font-weight:600;
  }

  header p{

    text-align: center;
  }

  main{
    margin-left:250px;
    max-width:1040px;
    border-color: #1a1a1a;
  }

  section{
    padding-top:3vh;
    color: white;
  }

  section:first-child{ 
    
    border-top:none; 
  
  }

  section h2{
        border-top:3px solid grey;
    border-bottom:3px solid grey;
    margin-top:0;
    font-size:40px;
  }

  section p{
    font-size: 25px;
    color: white;
    margin-top: 20px;
    margin-bottom: 20px;
  }
  section li{
    margin: 10px;
    font-size: 30px;
    color: antiquewhite
  }

  section img{
     height: 300px;
     width: 300px;
  }

#S5{
  width: 100%;
    height: 300px;
    border-radius: 16px;
}

.introduction a {
  color: #93c5fd;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

.introduction a:hover {
  color: #ffffff;
}
.YellowCorners{
  width: 100%;
    height: 300px;
    border-radius: 16px;
}

  header{
    display: grid;
    justify-content: center;
    align-items: center;
  }


  header p{
    font-size: 25px;
    color: white;
  }

.introduction li{
  color: antiquewhite
}

  .introduction{
    color: white;
margin-bottom: 20px;
margin-left:250px;
    max-width:1040px;
    font-size: 25px;
    margin-top: 40px;
  }

  .introduction p{
    margin-top: 20px;
    margin-bottom: 20px;

  }

  .introduction img{
width: 100%;
    height: 300px;
    border-radius: 16px;
  }






















/* ============================= */
/* ===== Responsive styles ===== */
/* ============================= */

@media (max-width: 1024px) {

  main{
    margin-left: 60px;
    padding: 0 24px;
    max-width: 100%;
  }

  .introduction {
    margin-left: 60px;
    padding: 0 35px;
    max-width: 100%;
  }

  .timeline-nav a:hover .labels,
  .timeline-nav a.active .labels {
    display: none;
  }

  .container {
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 92%;
  }

  .algorithms-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 92%;
  }

  .card-container,
  .card-container2 {
    gap: 60px;
    row-gap: 60px;
  }

  .card-container1 {
    gap: 80px;
    row-gap: 60px;
  }

  .swiper {
    height: 460px;
  }
}

@media (max-width: 768px) {

  h1 {
    font-size: 42px;
    margin: 20px;
  }

  h2, h3 {
    font-size: 24px;
    margin: 20px;
  }

  .algp h2 {
    font-size: 42px;
  }

  nav {
    height: auto;
    flex-wrap: wrap;
    justify-content: center;
    padding: 12px;
    gap: 10px;
    
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
  }

  .nav-links a {
    font-size: 15px;
  }

  .swiper {
    height: 380px;
  }

  .text-overlay h2 {
    font-size: 1.3rem;
  }

  .text-overlay p {
    font-size: 0.9rem;
  }

  .container {
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
  }

  .container img {
    width: 150px;
    height: 150px;
  }

  .algorithms-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;

    margin-bottom: 66px;
  }

  .algorithms-container img {
    width: 220px;
    height: 220px;
  }

  .card-container,
  .card-container1,
  .card-container2 {
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    row-gap: 30px;
  }

  .card-container .card:last-child {
    grid-template-columns: repeat(2, 1fr);
  }


  .YellowCorners,
  .introduction img {
    width: 100%;
    height: auto;
  }

  .introduction,
  section {
    font-size: 18px;
  }

  section h2 {
    font-size: 26px;
  }

  section p,
  .introduction p {
    font-size: 18px;
  }

  section li,
  .introduction li {
    font-size: 20px;
  }

  header p {
    font-size: 18px;
    padding: 0 16px;
  }
}

@media (max-width: 480px) {

  h1 {
    font-size: 30px;
  }

  .swiper {
    height: 300px;
  }

  .text-overlay h2 {
    font-size: 1.1rem;
  }

  .text-overlay p {
    margin-bottom:10px ;
  }

  .container {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .container img {
    width: 120px;
    height: 120px;
  }

  .algorithms-container img {
    width: 160px;
    height: 160px;
  }

  .card-container,
  .card-container1,
  .card-container2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-links {
    gap: 10px;
  }

  .nav-links a {
    font-size: 13px;
  }

  footer p,
  footer a {
    font-size: 13px;
  }

  


}