/* Google Color Scheme */
:root {
  --google-blue: #4285F4;
  --google-red: #DB4437;
  --google-yellow: #F4B400;
  --google-green: #0F9D58;

  --primary-color-light: #ffffff;
  --secondary-color-light: #f1f3f4;
  --text-color-light: #202124;
  --accent-color-light: var(--google-blue);

  --primary-color-dark: #202124;
  --secondary-color-dark: #292a2d;
  --text-color-dark: #e8eaed;
  --accent-color-dark: #8ab4f8;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  margin: 0;
  background-color: var(--secondary-color-light);
  color: var(--text-color-light);
  transition: background-color 0.3s, color 0.3s;
}

.sidebar {
  width: 250px;
  background-color: var(--google-blue);
  color: #fff;
  padding: 20px;
  height: 100vh;
  position: fixed;
  box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

.logo {
  text-align: center;
  margin-bottom: 2rem;
}

.logo h1 {
  font-size: 1.5rem;
  margin: 0;
}

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

.sidebar nav ul li a {
  display: block;
  padding: 10px;
  color: #fff;
  text-decoration: none;
  border-radius: 5px;
  margin-bottom: 5px;
}

.sidebar nav ul li a i {
  margin-right: 10px;
}

.sidebar nav ul li a:hover, .sidebar nav ul li a.active {
  background-color: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.theme-switcher {
  position: absolute;
  bottom: 20px;
  left: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.theme-switcher i {
    font-size: 1.2rem;
}

.main-content {
  margin-left: 250px;
  padding: 20px;
}

#home {
    padding-top: 4rem;
}

.about-content {
  display: flex;
  align-items: center;
  margin: 0 auto;
  max-width: 1080px;
  padding: 2rem;
}

.about-image {
  margin-right: 2rem;
}

.about-image img {
  width: 250px;
  height: 250px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
}

.intro-text h2 {
    font-size: 2rem;
    margin-top: 0;
}

.social-links-home a {
    text-decoration: none;
    color: var(--accent-color-light);
    margin-right: 15px;
    font-size: 1.1rem;
}

.social-links-home a i {
    margin-right: 5px;
}

.research-list .research-card {
    display: flex;
    margin-bottom: 2rem;
    background: var(--primary-color-light);
    padding: 1rem;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.research-list .research-card img {
    width: 200px;
    height: auto;
    margin-right: 1rem;
    object-fit: cover;
    object-position: center;
}

.research-list .research-card img.contain-fit {
    object-fit: contain;
}

.research-info h3 {
    margin-top: 0;
    border-top: 3px solid var(--accent-color-light);
    padding-top: 10px;
}

.research-info h3 a {
    text-decoration: none;
    color: var(--text-color-light);
}

.research-info h3 a:hover {
    text-decoration: underline;
}

.dark-mode .research-info h3 a {
    color: var(--text-color-dark);
}


.research-info .authors {
    font-style: italic;
}

.research-info .conference {
    font-weight: bold;
}

.research-info .links .spotlight {
    color: var(--google-yellow);
    font-weight: bold;
}

.research-info .links a {
    text-decoration: none;
    color: var(--accent-color-light);
}

.dark-mode .research-info .links a {
    color: var(--accent-color-dark);
}

.dark-mode .about-text a {
  color: var(--accent-color-dark);
}

.research-info .links a i {
    margin-right: 3px;
}

.pdf-viewer-container {
    height: 80vh;
}

.dark-mode {
  background-color: var(--secondary-color-dark);
  color: var(--text-color-dark);
}

.dark-mode .sidebar {
  background-color: var(--primary-color-dark);
  color: var(--text-color-dark);
}

.dark-mode .sidebar nav ul li a {
  color: var(--text-color-dark);
}

.dark-mode .sidebar nav ul li a:hover, .dark-mode .sidebar nav ul li a.active {
  background-color: var(--secondary-color-dark);
  color: var(--accent-color-dark);
}

.dark-mode .research-list .research-card {
  background: var(--primary-color-dark);
}

.dark-mode .social-links-home a {
    color: var(--accent-color-dark);
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  -webkit-transition: .4s;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  -webkit-transition: .4s;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--google-blue);
}

input:focus + .slider {
  box-shadow: 0 0 1px var(--google-blue);
}

input:checked + .slider:before {
  -webkit-transform: translateX(26px);
  -ms-transform: translateX(26px);
  transform: translateX(26px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

.btn {
    display: inline-block;
    background: var(--accent-color-light);
    color: #fff;
    padding: 0.5rem 1rem;
    text-decoration: none;
  border-radius: 5px;
    margin-top: 1rem;
}

.btn:hover {
    opacity: 0.9;
}

.dark-mode .btn {
    background: var(--accent-color-dark);
    color: var(--primary-color-dark)
}

@media (max-width: 768px) {
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 10px 20px;
    }

    .logo {
        margin-bottom: 0;
    }

    .sidebar nav ul {
        display: flex;
        flex-direction: row;
        margin: 0;
    }

    .main-content {
        margin-left: 0;
    }

    .about-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .about-image {
        margin-right: 0;
        margin-bottom: 1rem;
    }

    .research-list .research-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .research-list .research-card img {
        margin-right: 0;
        margin-bottom: 1rem;
    }

    .theme-switcher {
        position: static;
        margin: 0;
        width: auto;
    }

    .switch {
        width: 50px;
        height: 28px;
    }

    .slider:before {
        height: 20px;
        width: 20px;
        left: 4px;
        bottom: 4px;
    }

    input:checked + .slider:before {
        transform: translateX(22px);
    }

    .theme-switcher i {
        font-size: 1rem;
    }
}