/* ========== GLOBAL RESET ========== */
 * {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
 }

 /* ========== BODY STYLES ========== */
 body {
     font-family: 'Segoe UI', sans-serif;
     background-color: #0d1b2a;
 }

 /*=== Header Section ===*/
 .main-header {
     height: 60px;
     background: linear-gradient(135deg, #003366, #005580);
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding: 0px 30px;
     color: white;
     position: sticky;
     top: 0;
     z-index: 1000;
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
     backdrop-filter: blur(6px);

 }

 .logo-title {
     display: flex;
     align-items: center;
     gap: 10px;
 }

 .logo-title h1 {
     font-size: 1.8rem;
     font-weight: bold;
     letter-spacing: 1px;
     padding-bottom: 5px;
 }

 .logo-title h1 span {
     color: #00bcd4;
 }

 .nav-links a {
     margin-left: 25px;
     text-decoration: none;
     color: white;
     font-weight: 500;
     transition: color 0.3s, border-bottom 0.3s;
     position: relative;
 }

 .nav-links a::after {
     content: "";
     display: block;
     height: 2px;
     width: 0%;
     background: #00bcd4;
     position: absolute;
     bottom: -5px;
     left: 0;
     transition: 0.3s;
 }

 .nav-links a:hover {
     color: #00bcd4;
 }

 .nav-links a:hover::after {
     width: 100%;
 }

 /*=== Responsive ===*/
 @media (max-width: 768px) {
     .main-header {
         flex-direction: column;
         align-items: flex-start;
     }

     .nav-links {
         display: flex;
         flex-wrap: wrap;
         margin-top: 10px;
     }

     .nav-links a {
         margin: 10px 15px 0 0;
     }
 }

 /* ========== MAIN CONTAINER ========== */
 .container {
     max-width: 1100px;
     margin: 50px auto;
     padding: 20px;
 }

 /* ========== BIG CARD ========== */
 .big-card {
     background: #1b263b;
     border-radius: 20px;
     padding: 30px;
     box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
     display: flex;
     flex-direction: column;
     align-items: center;
     max-width: 940px;
     margin: 0 auto;
 }

 .big-card h2 {
     font-size: 2rem;
     color: #00bcd4;
     margin-bottom: 10px;
     text-align: center;
 }

 .big-card p {
     font-size: 1rem;
     color: #fff;
     margin-bottom: 30px;
     text-align: center;
     max-width: 700px;
 }

 /* ========== INNER CARDS WRAPPER ========== */
 .inner-cards {
     display: flex;
     justify-content: center;
     gap: 50px;
     flex-wrap: wrap;
 }

 /* ========== BOARD CARD (SMALL CARDS) ========== */
 .board-card {
     background: #f9f9f9;
     width: 340px;
     border-radius: 15px;
     box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
     overflow: hidden;
     transition: transform 0.3s ease, box-shadow 0.3s ease;
     display: flex;
     flex-direction: column;
 }

 .board-card:hover {
     transform: translateY(-6px);
     box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
 }

 .board-card img {
     width: 100%;
     height: 180px;
     object-fit: contain;
     background: white;
     padding: 15px;
 }

 /* ========== BOARD CONTENT ========== */
 .board-content {
     padding: 20px;
     text-align: center;
     display: flex;
     flex-direction: column;
     flex-grow: 1;
 }

 .board-title {
     font-size: 1.3rem;
     font-weight: bold;
     color: #003366;
     margin-bottom: 10px;
 }

 .board-desc {
     font-size: 0.95rem;
     color: #555;
     margin-bottom: auto;
 }

 .explore-btn {
     padding: 10px 20px;
     background: linear-gradient(to right, #00bcd4, #0097a7);
     color: white;
     border-radius: 25px;
     text-decoration: none;
     font-weight: 600;
     display: inline-block;
     margin-top: 15px;
 }

 .explore-btn:hover {
     background: linear-gradient(to right, #0097a7, #00bcd4);
 }

 /*=== Footer ===*/
 .footer {
     background-color: #002244;
     color: white;
     padding: 20px 20px 10px;
     margin-top: 20px;
 }

 .footer-flex {
     display: flex;
     justify-content: space-around;
     flex-wrap: wrap;
     text-align: left;
     margin-bottom: 20px;
 }

 .footer-block {
     max-width: 255px;
 }

 .footer-contact-heading,
 .footer-mathverse-heading,
 .footer-nav-heading {
     color: #00bcd4;
     margin-bottom: 10px;
 }

 .footer-block a {
     display: block;
     color: white;
     text-decoration: none;
     margin: 15px 0;
 }

 .footer-block a:hover {
     color: #00bcd4;
     ;
 }

 .footer-bottom {
     text-align: center;
     font-size: 0.9rem;
     border-top: 1px solid rgba(255, 255, 255, 0.2);
     padding-top: 10px;
 }