*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;

}
body{
   background: radial-gradient(circle at top left, #1e293b, #020617);
}
body::before {
  content: "";
  position: fixed;
  width: 300px;
  height: 300px;
  background: rgba(56, 189, 248, 0.3);
  filter: blur(120px);
  top: 10%;
  left: 10%;
  z-index: -1;
}
html{
  scroll-behavior: smooth;
}

header{
  background-color: #2563eb;
}
.highlight{
  background-color: yellow;
  color: black;
}

/* Navbar */
.nav_bar{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px ;
  border: px solid black;
  border-radius: 5px;
  
}

/* Left & Right item */
.nav_item{
  display: flex;
  gap: 40px;
  justify-content: space-evenly;
  
  
}

/* Links */
.nav_bar a{
  color: white;
  text-decoration: none;
  font-weight: bold;
}

/* Logo Center */
.logo_box{
  display: flex;
  align-items: center;
}

/* Logo */
.nitin_logo{
  height: 80px;
  border-radius: 20px;
}
/* search bar  */
.search_bar{
  height: 39px;
  min-width: 200px;
  width: 30%;
  display: flex;
  align-items: center;
  
}
/* search icon  */
.search_icon{
  box-sizing: content-box;
   height: 21px ;
   padding: 10px;
   background-color: #f5f5f6;
   color: #282c3f;
   border-radius: 4px 0 0 4px;
  }
   /* search input  */
   .search_input{
    flex-grow: 1;
    height: 40px;
    border: 0;
    border-radius: 0 4px  4px 0 ;
  
   }
   /*hero = after nav bar   */
   .hero{
    height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  background: linear-gradient(135deg, #020617, #0f172a, #1e293b);
  overflow: hidden;
  background: url('bgi.png') no-repeat center/cover;
    
   }
   .hero::before{
   content: "";
  position: absolute;
  width: 400px;
  height: 400px;
  background: rgba(56, 189, 248, 0.3);
  filter: blur(120px);
  top: 10%;
  left: 20%;
}
.hero::after {
  content: "";
  position: absolute;
  width: 300px;
  height: 300px;
  background: rgba(34, 197, 94, 0.3);
  filter: blur(120px);
  bottom: 10%;
  right: 20%;
}
.hero_content {
  max-width: 700px;
  color: white;
  z-index: 1;
}

.hero *{
  position: relative;
  color: white;
}
   .hero h1{
  font-size: 48px;
  background: linear-gradient(90deg, #38bdf8, #22c55e);
  
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;

  /* Standard version (for modern browsers) */
  background-clip: text;
  color: transparent;
  
  
}

.hero p{
  font-size: 18px;
  margin-bottom: 25px;
  color: #cbd5f5;
}
.hero_btns {
  display: flex;
  gap: 15px;
  justify-content: center;
}

.btn_primary {
  padding: 12px 25px;
  background: linear-gradient(45deg, #38bdf8, #22c55e);
  color: white;
  border-radius: 30px;
  text-decoration: none;
  transition: 0.3s;
}

.btn_primary:hover {
  transform: scale(1.1);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.6);
}

.btn_secondary {
  padding: 12px 25px;
  border: 1px solid #38bdf8;
  color: #38bdf8;
  border-radius: 30px;
  text-decoration: none;
  transition: 0.3s;
}

.btn_secondary:hover {
  background: #38bdf8;
  color: black;
}

.hero_btns a{
  text-decoration: none;
  color: white;
  background-color: black;
  padding: 10px 20px;
  margin: 5px;
  border-radius: 5px;
}
/* year = buttons to find paper  */
.year{
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 25px;
  padding: 20px;
  background: linear-gradient(to right, #2563eb, #3b82f6);
  border-radius: 10px ;
  border: 2px solid  gray ;
  margin: 20px;
  
}
.button_year{
  height: 40px;
  width: 130px;
  border: none;
  border-radius: 25px;   /* round buttons  */
  background-color: white;
  color: #2563eb;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
}

.button_year:hover{
  background-color: #1e3a8a;
  color: white;
  transform: scale(1.1);
}

.button_year.active{
  background-color: black;
  color: white;
}
/* ===== GLASS EFFECT BASE ===== */
.glass {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 25px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px); /* for Safari */
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Optional hover effect / header  */
.glass:hover {
  transform: translateY(-5px);
  transition: 0.3s ease;
}
.about::before,
.contact::before {
  content: "";
  position: absolute;
  width: 200px;
  height: 200px;
  background: rgba(56, 189, 248, 0.3);
  filter: blur(100px);
  top: 20%;
  left: 10%;
  z-index: 0;
}
.about, .contact {
  position: relative;
  overflow: hidden;
}
.glass {
  position: relative;
  z-index: 1;
}

  .about {
  padding: 60px 20px;
  background: linear-gradient(135deg, #0f172a, #1e293b);
  text-align: center;
  color: white;
}

.about h2{
 margin-top: 32px;
  margin-bottom: 20px;
  text-align: center;
  color: #38bdf8;
}

.about p{
   max-width: 700px;
  margin: 10px auto;
  font-size: 16px;
  line-height: 1.6;
  color: #cbd5f5;
}

hr {
  margin-top: 100px;
  color: gray;
}

.contact_hr{
 display: block;
    margin-block-start: 0.5em;
    margin-block-end: 0.5em;
    margin-inline-start: auto;
    margin-inline-end: auto;
    color: gray;
    unicode-bidi: isolate;
    overflow: hidden;
    border-style: inset;
    border-width: 1px;
    margin-top: 70px;
}

.contact{
 padding: 60px 20px;
  background: linear-gradient(135deg, #020617, #0f172a);
  text-align: center;
  color: white;
}

.contact h2{
  font-size: 30px;
  margin-bottom: 20px;
  color: #22c55e;
}

.contact p{
background: #0f172a;
  display: inline-block;
  padding: 10px 20px;
  margin: 8px;
  border-radius: 10px;
  transition: 0.3s;
}
.contact p:hover {
  background: #1e293b;
  transform: translateY(-3px);
}

.contact .touch {
  margin-top: 20px;
}

.touch{
  margin-top: 15px;
  
}
.text_link{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: linear-gradient(45deg, #ff416c, #ff4b2b);
  color: white;
  border-radius: 30px;
  text-decoration: none;
  transition: 0.3s;
  font-weight: bold;

}
.text_link:hover {
  transform: scale(1.1);
  box-shadow: 0 0 15px rgba(255, 75, 43, 0.7);
}

.touch_logo {
  width: 20px;
}
/* Text */
.card h3{
  margin: 10px 0;
}

.card p{
  color: gray;
}

/* Button */
.card a{
  display: inline-block;
  margin: 10px;
  padding: 8px 15px;
  background-color:#1e3a8a;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}
 .card:hover{
  transform: scale(1.05);
}
.card{
  width: 220px;
  overflow: hidden;
  text-align: center;
  background-color: white;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
  margin-top: 10px;
  transition: all 0.4s ease;
  
}

.hide{
  opacity: 0;
  transform: scale(0.8);
  filter: blur(3px);
}

/* show state */
.show{
  opacity: 1;
  transform: scale(1);
}

/* Image Container */
.card_img{
  position: relative;
}

/* Image */
.card_img img{
  height: 200px;
  object-fit: cover;
}

/* Download Button on Image */
.download_btn{
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);

  background-color: black;
  color: white;
  padding: px px;
  text-decoration: none;
  font-size: 14px;
}

.card_img img{
  transition: 0.3s;
}

.card:hover img{
  transform: scale(1.05);
}

.papers{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  padding: 20px;
}


/* mobile media  */ 
@media (max-width: 768px){
  /* mobile styles here */
}
@media (max-width: 768px){
  .nav_bar{
    flex-direction: column;
    gap: 10px;
  }

  .nav_item{
    flex-direction: column;
    gap: 10px;
    align-items: center;
  }

  .search_bar{
    width: 100%;
  }
}
@media (max-width: 768px){
  .hero{
    height: 300px;

    padding: 20px;
    
  }

  .hero h1{
    font-size: 24px;
  }

  .hero p{
    font-size: 14px;
  }
}
@media (max-width: 768px){
  .year{
    flex-direction: column;
    gap: 10px;
    height: auto;
  }

  .button_year{
    width: 80%;
  }
}

.papers{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* Mobile */
@media (max-width: 768px){
  .papers{
    grid-template-columns: 1fr;  /* 1 card per row */
  }
}
img{
  max-width: 100%;
  height: auto;
}