/* =============================================
   1. Global styles
   2. Header and navigation
   3. Publications page
   4. Responsive adjustments
   5. Scroll top button
============================================= */

@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap");
@import url("https://fonts.googleapis.com/css2?family=Nunito:ital,wght@0,300;0,400;0,600;0,700;1,300;1,400&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  text-decoration: none;
  outline: none;
  border: none;
  transition: all .2s linear;
}

*::selection {
  background: #2b3dda;
  color: #fff;
}

html {
  font-size: 62.5%;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

html::-webkit-scrollbar {
  width: .8rem;
}

html::-webkit-scrollbar-track {
  background: rgb(235, 202, 245);
}

html::-webkit-scrollbar-thumb {
  background: #420177;
}

body {
  background: #f7f7f7;
  font-family: "Poppins", sans-serif;
  color: #222;
}

/* navbar starts */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.7rem 10%;
  height: 6.5rem;
  background-color: #fff;
  box-shadow: 0 1px 4px rgba(146, 161, 176, .3);
}

section {
  min-height: 100vh;
  padding: 2rem 9%;
}

.heading {
  font-size: 3.5rem;
  color: rgb(32, 32, 32);
  font-weight: 800;
  text-align: center;
}

.heading span {
  color: rgb(115, 3, 167);
}

header .logo {
  font-size: 1.9rem;
  font-weight: 800;
  color: #0E2431;
}

header .logo i {
  font-size: 2.2rem;
}

header .logo:hover {
  color: #fc8c05;
}

header .navbar ul {
  list-style: none;
  display: flex;
  justify-content: center;
  align-items: center;
}

header .navbar li {
  margin-left: 2.5rem;
}

header .navbar ul li a {
  font-size: 1.57rem;
  color: #0E2431;
  font-weight: 600;
  letter-spacing: .04rem;
}

header .navbar ul li a.active,
header .navbar ul li a:hover {
  color: #011aff;
  border-bottom: .2rem solid #011aff;
  padding: .5rem 0;
}
/* navbar ends */

/* hamburger icon starts */
#menu {
  font-size: 3rem;
  cursor: pointer;
  color: rgb(24, 2, 63);
  display: none;
  background: transparent;
}

@media (max-width: 768px) {
  #menu {
    display: block;
  }

  header .navbar {
    position: fixed;
    top: 6.5rem;
    right: -120%;
    width: 75%;
    height: 100%;
    text-align: left;
    align-items: flex-start;
    background-color: #0e0f31;
  }

  header .navbar ul {
    flex-flow: column;
    padding: 1rem;
  }

  header .navbar ul li {
    text-align: center;
    margin: 1rem 0;
    border-radius: .5rem;
    width: 26rem;
  }

  header .navbar ul li a {
    display: block;
    padding: 1rem;
    text-align: left;
    color: #fff;
    font-size: 2rem;
  }

  header .navbar ul li a.active,
  header .navbar ul li a:hover {
    padding: 1rem;
    color: #fff;
    border-radius: .5rem;
    border-bottom: .5rem solid #011aff;
  }

  .fa-times {
    transform: rotate(180deg);
  }

  header .navbar.nav-toggle {
    right: 0;
  }
}
/* hamburger icon ends */

/* work section starts */
.work {
  background: linear-gradient(to bottom, #f7f7f7, #f7f7f7);
  margin-top: 5rem;
}

.work h2 {
  color: #000;
  padding: 1rem 0;
}

.work .heading span {
  color: rgb(255, 230, 0);
}

.page-description {
  max-width: 900px;
  margin: 1rem auto 2rem;
  text-align: center;
  font-size: 1.55rem;
  line-height: 1.8;
  color: #444;
}

.work .button-group {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.work .button-group .btn {
  padding: 1rem 2rem;
  background: transparent;
  color: #000;
  border: 1px solid #000;
  border-radius: 3px;
  cursor: pointer;
  font-weight: 500;
  text-align: center;
  font-size: 1.45rem;
}

.work .button-group .btn:hover {
  background-color: #000;
  color: rgb(255, 230, 0);
}

.work .button-group .btn.is-checked {
  background-color: #000;
  color: rgb(255, 230, 0);
}

.work .box-container {
  display: block;
  margin: 2rem auto 0;
  max-width: 1200px;
}

.publications-list {
  width: 100%;
}

/* publication sections */
.publication-section {
  display: block;
  margin-bottom: 3rem;
}

.publication-section.is-hidden {
  display: none;
}

.publication-section h2 {
  font-size: 2.3rem;
  font-weight: 700;
  color: #222;
  margin-bottom: 1.2rem;
  text-align: center;
}

.publication-items {
  max-width: 85%;
  margin: 0 auto;
  padding: 0 2rem;
  list-style: disc;
  font-family: "Times New Roman", Times, serif;
}

.publication-item {
  font-size: 1.6rem;
  line-height: 1.85;
  color: #555;
  margin-bottom: 1rem;
  text-align: left;
}

.publication-item a,
.publication-text {
  font-family: inherit;
  font-size: 1.6rem;
  color: inherit;
}

.publication-item em {
  font-style: italic;
}

.publication-item a {
  color: #007acc;
}

.publication-item a:hover {
  color: #005599;
  text-decoration: underline;
}

/* legacy box styles kept for compatibility */
.work .box-container .box {
  flex: 1 1 30rem;
  border-radius: .5rem;
  box-shadow: 0 .7rem 1rem rgba(0, 0, 0, .3);
  position: relative;
  overflow: hidden;
  height: 30rem;
  background: #fff;
}

.work .box-container .box img {
  height: 100%;
  width: 100%;
  object-fit: cover;
}

.work .box-container .box .content {
  height: 100%;
  width: 100%;
  position: absolute;
  top: 85%;
  left: 0;
  background: rgba(255, 255, 255, .9);
  display: flex;
  flex-direction: column;
}

.work .box-container .box .content .tag {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  height: 4.5rem;
  width: 100%;
  padding-left: 1rem;
  background: #ffd900;
}

.work .box-container .box .content .tag h3 {
  font-size: 3rem;
}

.work .box-container .box:hover .content {
  top: 25%;
}

.work .desc {
  margin: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.work .desc p {
  font-size: 4rem;
}

.work .desc .btns {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-top: 2rem;
}

.work .desc .btns .btn {
  line-height: 0;
  display: inline;
  padding: 1.5rem 2.5rem;
  border-radius: .5rem;
  font-size: 1.5rem;
  color: #fff;
  background: rgb(12, 12, 12);
  margin-right: 2rem;
}

.work .desc .btns .btn:hover {
  background: #310ae0f5;
}

/* back to home button */
.backbtn {
  display: flex;
  justify-content: center;
  margin-top: 4rem;
  margin-bottom: 2rem;
}

.backbtn .btn {
  position: relative;
  line-height: 1;
  padding: 1.6rem 3rem;
  border-radius: .5em;
  color: #000;
  border: 2px solid #000;
  box-shadow: 0 2px 4px rgba(48, 68, 247, .3);
  text-align: center;
}

.backbtn .btn span {
  font-weight: 600;
  font-size: 1.7rem;
  font-family: "Nunito", sans-serif;
}

.backbtn .btn i {
  margin-right: .5rem;
  font-size: 1.5rem;
}

.backbtn .btn:hover {
  background: #000;
  color: rgb(255, 230, 0);
}

.backbtn .btn:hover i {
  transform: translateX(-8px);
}
/* work section ends */

/* common media queries starts */
@media (max-width: 450px) {
  html {
    font-size: 55%;
  }

  body {
    padding-right: 0;
  }

  section {
    padding: 2rem;
  }

  .work .button-group {
    width: 100%;
  }

  .work .box-container {
    margin: 0;
  }

  .publication-items {
    max-width: 100%;
    padding: 0 1.2rem 0 2rem;
  }

  .publication-section h2 {
    font-size: 2rem;
  }

  .page-description {
    font-size: 1.45rem;
  }
}
/* common media queries ends */

/* scroll top starts */
#scroll-top {
  position: fixed;
  top: -140%;
  right: 2rem;
  padding: 1rem 1.5rem;
  font-size: 2rem;
  background: #ffae00;
  color: rgb(13, 0, 44);
  border-radius: 5rem;
  z-index: 1000;
  transition: 1s linear;
}

#scroll-top.active {
  top: calc(100% - 12rem);
}
/* scroll top ends */