/* ===== Base & Utilities ===== */
    *, *::before, *::after {
        box-sizing: border-box;
    }

    html {
        scroll-behavior: smooth;
        scroll-padding-top: 80px;
    }

    body {
        margin: 0;
        overflow-x: hidden;
    }

    ::selection {
        background: rgba(54, 112, 112, 0.4);
        color: #e2e8f0;
    }

    /* ===== Scrollbar ===== */
    ::-webkit-scrollbar {
        width: 8px;
    }
    ::-webkit-scrollbar-track {
        background: #0d1319;
    }
    ::-webkit-scrollbar-thumb {
        background: #1e2d3d;
        border-radius: 4px;
    }
    ::-webkit-scrollbar-thumb:hover {
        background: #367070;
    }

    /* ===== Navigation ===== */
    #navbar {
        background: transparent;
        transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
    }

    #navbar.scrolled {
        background: rgba(13, 19, 25, 0.9);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
    }

    .nav-link {
        position: relative;
    }

    .nav-link::after {
        content: '';
        position: absolute;
        bottom: -4px;
        left: 50%;
        width: 0;
        height: 1px;
        background: #5eead4;
        transition: all 0.3s ease;
        transform: translateX(-50%);
    }

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

    /* ===== Mobile Menu ===== */
    #mobile-menu.active {
        opacity: 1;
        pointer-events: all;
    }

    .mobile-link {
        position: relative;
    }

    .mobile-link::after {
        content: '';
        position: absolute;
        bottom: -4px;
        left: 50%;
        width: 0;
        height: 1px;
        background: #5eead4;
        transition: all 0.3s ease;
        transform: translateX(-50%);
    }

    .mobile-link:hover::after {
        width: 100%;
    }

    /* Hamburger Animation */
    #menu-btn.active .menu-line:nth-child(1) {
        transform: translateY(5px) rotate(45deg);
    }
    #menu-btn.active .menu-line:nth-child(2) {
        opacity: 0;
        transform: scaleX(0);
    }
    #menu-btn.active .menu-line:nth-child(3) {
        transform: translateY(-5px) rotate(-45deg);
        width: 1.375rem;
    }

    /* ===== Floating Cards ===== */
    .floating-card {
        animation: float 6s ease-in-out infinite;
    }

    .floating-card:nth-child(2) {
        animation-delay: -2s;
    }

    .floating-card:nth-child(3) {
        animation-delay: -4s;
    }

    @keyframes float {
        0%, 100% { transform: translateY(0px); }
        50% { transform: translateY(-12px); }
    }

    /* ===== Menu Cards ===== */
    .menu-card {
        will-change: transform;
    }

    /* ===== Feature Cards ===== */
    .feature-card {
        will-change: transform;
    }

    /* ===== Fade-In Animations ===== */
    .fade-in {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.8s ease, transform 0.8s ease;
    }

    .fade-in.visible {
        opacity: 1;
        transform: translateY(0);
    }

    .fade-in-delay-1 { transition-delay: 0.1s; }
    .fade-in-delay-2 { transition-delay: 0.2s; }
    .fade-in-delay-3 { transition-delay: 0.3s; }
    .fade-in-delay-4 { transition-delay: 0.4s; }

    /* ===== Decorative Divider ===== */
    .section-divider {
        height: 1px;
        background: linear-gradient(90deg, transparent, rgba(94, 234, 212, 0.2), transparent);
    }

    /* ===== Image Hover ===== */
    .img-zoom {
        transition: transform 0.7s ease;
    }

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

    /* ===== Input Autofill ===== */
    input:-webkit-autofill,
    textarea:-webkit-autofill {
        -webkit-box-shadow: 0 0 0 30px #1e2a3a inset !important;
        -webkit-text-fill-color: #e2e8f0 !important;
    }

    /* ===== Responsive Adjustments ===== */
    @media (max-width: 768px) {
        html {
            scroll-padding-top: 70px;
        }

        .floating-card {
            display: none;
        }
    }

    @media (min-width: 769px) and (max-width: 1024px) {
        .floating-card {
            display: none;
        }
    }