body {
            font-family: 'Poppins', sans-serif;
            background-color: #f8f9fa;
            color: #343a40;
        }

        .navbar {
            background-color: #ffffff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            transition: all 0.3s ease;
        }

        .navbar-brand {
            font-weight: 700;
            color: #0056b3 !important;
        }

        .nav-link {
            color: #343a40 !important;
            font-weight: 400;
            transition: color 0.3s ease;
        }

        .nav-link.active, .nav-link:hover {
            color: #0056b3 !important;
        }

        .hero {
            background: linear-gradient(rgba(0, 86, 179, 0.6), rgba(154, 241, 170, 0.6)), url('./img/register-hero.jpg') no-repeat center center;
            background-size: cover;
            color: white;
            padding: 120px 0;
            text-align: center;
        }

        .hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
        }

        .hero p {
            font-size: 1.25rem;
            font-weight: 300;
        }

        .profile-pic {
            width: 180px;
            height: 180px;
            border-radius: 50%;
            border: 5px solid rgba(255, 255, 255, 0.5);
            margin-bottom: 20px;
            background-color: #efefef;
        }

        .section {
            padding: 80px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 60px;
            font-weight: 600;
            color: #003366;
            position: relative;
        }
        
        .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background: #0056b3;
            margin: 10px auto 0;
            border-radius: 2px;
        }

        #about {
            background-color: #ffffff;
        }

        .card {
            border: none;
            border-radius: 15px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }

        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 8px 30px rgba(0,0,0,0.12);
        }

        .card-icon {
            font-size: 2.5rem;
            color: #0056b3;
            margin-bottom: 15px;
        }
        
        .publication-item {
            padding: 15px;
            border-left: 4px solid #0056b3;
            margin-bottom: 20px;
            background: #ffffff;
            border-radius: 0 8px 8px 0;
        }

        #hobbies .card-body {
            padding-top: 0;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        #contact {
            background-color: #003366;
            color: white;
        }
        
        #contact .section-title {
            color: white;
        }

        #contact .section-title::after {
            background: #ffffff;
        }

        .contact-info i {
            color: #ffffff;
            margin-right: 15px;
        }

        .social-icons a {
            color: white;
            font-size: 1.5rem;
            margin: 0 10px;
            transition: color 0.3s ease;
        }

        .social-icons a:hover {
            color: #0d6efd;
        }
        
        .footer {
            background-color: #002244;
            color: white;
            padding: 20px 0;
            text-align: center;
        }

        .hero-section {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            background: 
                linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0.5) 100%), 
                url('../img/register-hero.jpg') no-repeat center center;
            background-size: cover;
            background-attachment: fixed;
            color: #2d3436;
            overflow: hidden;
        }

        .hero-card {
            background: rgba(255, 255, 255, 0.4);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.5);
            border-radius: 2rem;
            padding: 4rem 2rem;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
        }

        .hero-title {
            font-size: clamp(2.5rem, 8vw, 4.5rem);
            font-weight: 800;
            letter-spacing: -1px;
            background: linear-gradient(to right, #003366, #0056b3);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-badge {
            background: #e1f5fe;
            color: #0056b3;
            padding: 0.5rem 1.25rem;
            border-radius: 50px;
            display: inline-block;
            margin-bottom: 1.5rem;
            font-weight: 700;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            border: 1px solid rgba(0, 86, 179, 0.1);
        }

        .lead-text {
            font-size: 1.35rem;
            color: #4a5568;
            max-width: 750px;
            margin: 0 auto;
        }

        @keyframes pulse-glow {
            0% { box-shadow: 0 0 0 0 rgba(0, 86, 179, 0.1); }
            70% { box-shadow: 0 0 0 10px rgba(0, 86, 179, 0); }
            100% { box-shadow: 0 0 0 0 rgba(0, 86, 179, 0); }
        }

        .hero-badge {
            animation: pulse-glow 2s infinite;
        }

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg-soft);
        }

        .section {
            padding: 80px 0;
        }

        .section-title {
            font-weight: 800;
            font-size: 2.5rem;
            color: var(--text-main);
            margin-bottom: 3rem;
            position: relative;
            display: inline-block;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }

        .hobby-card {
            border: none;
            border-radius: 20px;
            background: #ffffff;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .hobby-card:hover {
            transform: translateY(-12px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
        }

        .img-container {
            overflow: visible;
            position: relative;
        }

        .hobby-card img {
            transition: transform 0.6s ease;
            object-fit: cover;
            height: 200px;
            width: 100%;
            border-top-left-radius: 20px;
            border-top-right-radius: 20px;
        }

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

        .card-icon-wrapper {
            width: 54px;
            height: 54px;
            background: #ffffff;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: absolute;
            bottom: -27px;
            left: 25px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            z-index: 10;
        }

        .card-icon-wrapper i {
            font-size: 1.4rem;
            color: var(--primary-color);
            line-height: 1;
        }

        .card-body {
            padding: 45px 25px 25px 25px !important;
            text-align: left !important;
            flex-grow: 1;
        }

        .card-title {
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 0.75rem;
            font-size: 1.15rem;
        }

        .card-text {
            color: var(--text-muted);
            line-height: 1.6;
            font-size: 0.9rem;
        }

        .btn-clan {
            background: linear-gradient(135deg, #0d6efd 0%, #0b5ed7 100%);
            border: none;
            padding: 10px 16px;
            border-radius: 10px;
            font-weight: 600;
            font-size: 0.85rem;
            letter-spacing: 0.5px;
            color: white;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(13, 110, 253, 0.2);
            text-decoration: none;
            display: inline-block;
        }

        .btn-clan:hover {
            box-shadow: 0 6px 20px rgba(13, 110, 253, 0.3);
            transform: scale(1.02);
            color: white;
        }

        @media (min-width: 769px) {
            .row-three-cols > div {
                flex: 0 0 33.333333%;
                max-width: 33.333333%;
            }
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 2rem;
            }
            .row-three-cols > div {
                flex: 0 0 100%;
                max-width: 100%;
            }
        }