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

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

    body {
        overflow-x: hidden;
    }

    ::selection {
        background: rgba(94, 234, 212, 0.3);
        color: #f0fdf9;
    }

    /* Navbar */
    #navbar {
        background: transparent;
    }

    #navbar.scrolled {
        background: rgba(3, 11, 24, 0.9);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    }

    .nav-link {
        position: relative;
    }

    .nav-link::after {
        content: '';
        position: absolute;
        bottom: -4px;
        left: 0;
        width: 0;
        height: 2px;
        background: #5eead4;
        transition: width 0.3s ease;
    }

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

    .nav-link:hover {
        color: #5eead4 !important;
    }

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

    .mobile-link {
        opacity: 0;
        transform: translateY(20px);
        transition: all 0.4s ease;
    }

    #mobile-menu.open .mobile-link {
        opacity: 1;
        transform: translateY(0);
    }

    #mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.1s; }
    #mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.15s; }
    #mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.2s; }
    #mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.25s; }
    #mobile-menu.open .mobile-link:nth-child(5) { transition-delay: 0.3s; }

    /* Menu Toggle Animation */
    #menu-toggle.active .menu-line:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    #menu-toggle.active .menu-line:nth-child(2) {
        opacity: 0;
        transform: translateX(10px);
    }

    #menu-toggle.active .menu-line:nth-child(3) {
        width: 24px;
        transform: rotate(-45deg) translate(5px, -5px);
    }

    /* Scroll Animations */
    .reveal {
        opacity: 0;
        transform: translateY(40px);
        transition: opacity 0.8s ease, transform 0.8s ease;
    }

    .reveal.visible {
        opacity: 1;
        transform: translateY(0);
    }

    .reveal-left {
        opacity: 0;
        transform: translateX(-40px);
        transition: opacity 0.8s ease, transform 0.8s ease;
    }

    .reveal-left.visible {
        opacity: 1;
        transform: translateX(0);
    }

    .reveal-right {
        opacity: 0;
        transform: translateX(40px);
        transition: opacity 0.8s ease, transform 0.8s ease;
    }

    .reveal-right.visible {
        opacity: 1;
        transform: translateX(0);
    }

    /* Stagger children */
    .stagger-children > * {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.5s ease, transform 0.5s ease;
    }

    .stagger-children.visible > *:nth-child(1) { transition-delay: 0.05s; opacity: 1; transform: translateY(0); }
    .stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; opacity: 1; transform: translateY(0); }
    .stagger-children.visible > *:nth-child(3) { transition-delay: 0.15s; opacity: 1; transform: translateY(0); }
    .stagger-children.visible > *:nth-child(4) { transition-delay: 0.2s; opacity: 1; transform: translateY(0); }
    .stagger-children.visible > *:nth-child(5) { transition-delay: 0.25s; opacity: 1; transform: translateY(0); }
    .stagger-children.visible > *:nth-child(6) { transition-delay: 0.3s; opacity: 1; transform: translateY(0); }

    /* Parallax-like subtle effects */
    @media (prefers-reduced-motion: no-preference) {
        .float-slow {
            animation: float 6s ease-in-out infinite;
        }

        .float-medium {
            animation: float 4s ease-in-out infinite;
        }
    }

    @keyframes float {
        0%, 100% { transform: translateY(0); }
        50% { transform: translateY(-10px); }
    }

    /* Custom scrollbar */
    ::-webkit-scrollbar {
        width: 8px;
    }

    ::-webkit-scrollbar-track {
        background: #06142b;
    }

    ::-webkit-scrollbar-thumb {
        background: #1e4a8a;
        border-radius: 4px;
    }

    ::-webkit-scrollbar-thumb:hover {
        background: #2d5fa8;
    }

    /* Focus styles */
    a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
        outline: 2px solid #5eead4;
        outline-offset: 2px;
    }

    /* Image placeholder fallback */
    img {
        background: linear-gradient(135deg, #0f2c59 0%, #1e4a8a 100%);
    }