:root{
    --primary: white;
    --theme: mediumpurple;
    --dark-theme: rgb(127, 93, 193);
    --meta: #777;
}

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

body{
    width: 100%;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

header{
    background: var(--primary);
    width: 100%;
    height: 150px;
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
    transition: 5s;
    justify-self: center;
    padding: 5px;
    box-shadow: 5px 5px 15px rgba(0, 0 ,0, 0.8);
}

.header{
    display: flex;
    justify-content: center;
    text-align: center;
    position: relative;
    justify-content: space-between;
    width: 100%;
}

header h1{
    color: var(--theme);
}

.logo{
    color: var(--meta);
    font-family: fantasy;
    font-size: small;
}

/* Overlay background */
.nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: 100vw;
  background: rgba(0,0,0,0.4);
  -webkit-backdrop-filter: blur(5px);
  backdrop-filter: blur(5px);
  z-index: 8;
  display: none;
}

.nav-overlay.show {
  display: block;
}

/* Ensure nav appears above overlay */
.nav {
  z-index: 10;
}

.nav { display: flex; gap: 15px; }

.nav a { 
  color: mediumpurple; 
  text-decoration: none; 
  font-weight: 500;
}

.nav a:hover{
    color: var(--meta);
}

.menu-btn { 
  display: none; 
  font-size: 28px; 
  cursor: pointer;
  color: var(--theme);
}

@media (max-width: 768px) {
      .nav { 
        display: none; 
        flex-direction: column; 
        background: var(--primary); 
        position: absolute; 
        top: 60px; 
        right: 0; 
        width: 200px; 
        padding: 20px; 
        border-radius: 8px; 
        transition: 5s;
        box-shadow: 5px 5px 15px rgba(0, 0 ,0, 0.8);
    }
      
    .nav.show { 
        display: flex; 
    }

      .menu-btn {
         display: block; 
        }
}

.padding{
    padding: 90px;
}

.padding-2{
    padding: 40px;
}

.contact{
    margin: auto;
    height: 100vh;
    height: max-content;
    width: calc(89%);
    border-radius: 12px;
    box-shadow: 5px 5px 15px rgba(0, 0 ,0, 0.8);
    margin-left: auto;
    margin-right: auto;
    padding: 20px;
}

label{
    float: left;
    color: var(--meta);
}

input{
    float: left;
    width: 80%;
    height: 50px;
    border-radius: 22px;
    text-align: left;
    padding: 5px;
    color: var(--theme);
    border-color: var(--meta);
}

#msg{
    height: 80px;
}

.submit{
    margin-left: auto;
    margin-right: auto;
    float: unset;
    color: var(--primary);
    background-color: var(--theme);
    text-align: center;
    border-color: transparent;
    transition: 1s;
}

.submit:hover{
    background-color: var(--dark-theme);
}

/* --- Research Portal Styling --- */

.research-portal {
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.search-container {
    margin-bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.search-box {
    display: flex;
    gap: 10px;
    width: 100%;
    max-width: 600px;
}

.search-box input {
    flex: 1;
    float: none; /* Resetting your global float */
    height: 45px;
    padding: 0 20px;
    border: 2px solid var(--theme);
    border-radius: 25px;
    outline: none;
}

.search-box button {
    padding: 0 25px;
    background: var(--theme);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

.search-box button:hover {
    background: var(--dark-theme);
}

/* Category Filter Buttons */
.category-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.filter-btn {
    background: transparent;
    color: var(--theme);
    border: 1px solid var(--theme);
    padding: 6px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: 0.3s;
}

.filter-btn:hover {
    background: var(--theme);
    color: white;
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.status-msg {
    grid-column: 1 / -1;
    color: var(--meta);
    font-style: italic;
    margin-top: 20px;
}

/* Research Card Design */
.research-card {
    background: var(--primary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transition: 0.3s;
    text-align: left; /* Local override for cards */
}

.research-card:hover {
    transform: translateY(-8px);
    box-shadow: 5px 5px 15px rgba(0,0,0,0.3);
}

.research-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.card-content {
    padding: 15px;
    text-align: left;
}

.card-content h3 {
    color: var(--theme);
    font-size: 1.1rem;
    margin-bottom: 8px;
    text-align: left;
}

.card-content p {
    font-size: 0.85rem;
    color: var(--meta);
    line-height: 1.4;
    text-align: left;
    margin-bottom: 10px;
}

.card-meta {
    border-top: 1px solid #eee;
    padding-top: 10px;
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--meta);
    text-transform: uppercase;
}


footer{
     color: #777;
     margin: 40px auto;
     padding: 20px;
     background-color: #f9f9f9;
     border: 1px solid #ddd;
     box-shadow: 0 0 10px rgba(0,0,0,.1);
     border-radius: 12px;
     width: calc(100% - 5%);
     text-align: center;
     transition: 1.5s;
}