/* ── Base & Reset ── */
    *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    html {
        scroll-behavior: smooth;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    body {
        overflow-x: hidden;
    }

    img {
        max-width: 100%;
        height: auto;
    }

    ::selection {
        background-color: #99f6e4;
        color: #042f2e;
    }

    /* ── Scrollbar ── */
    ::-webkit-scrollbar {
        width: 8px;
    }
    ::-webkit-scrollbar-track {
        background: #f8fafc;
    }
    ::-webkit-scrollbar-thumb {
        background: #cbd5e1;
        border-radius: 999px;
    }
    ::-webkit-scrollbar-thumb:hover {
        background: #94a3b8;
    }

    /* ── Navbar ── */
    #navbar {
        background: rgba(255, 255, 255, 0.85);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(226, 232, 240, 0.5);
    }

    #navbar.scrolled {
        background: rgba(255, 255, 255, 0.95);
        box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
    }

    /* ── Mobile Menu ── */
    #mobileMenu {
        transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
        opacity: 0;
    }

    #mobileMenu.open {
        max-height: 400px;
        opacity: 1;
    }

    #mobileMenu.closed {
        max-height: 0;
        opacity: 0;
    }

    .mobile-link {
        position: relative;
    }

    .mobile-link::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 0;
        width: 0;
        height: 2px;
        background: #0d9488;
        transition: width 0.3s ease;
    }

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

    /* ── Hamburger Animation ── */
    #menuBtn.active #bar1 {
        transform: translateY(3.5px) rotate(45deg);
    }
    #menuBtn.active #bar2 {
        opacity: 0;
        transform: scaleX(0);
    }
    #menuBtn.active #bar3 {
        transform: translateY(-3.5px) rotate(-45deg);
        width: 50%;
    }

    /* ── Scroll Reveal ── */
    .reveal {
        opacity: 0;
        transform: translateY(30px);
        transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    @media (prefers-reduced-motion: no-preference) {
        .reveal {
            opacity: 0;
            transform: translateY(30px);
        }
    }

    @media (prefers-reduced-motion: reduce) {
        .reveal {
            opacity: 1;
            transform: none;
            transition: none;
        }
        html {
            scroll-behavior: auto;
        }
        * {
            transition-duration: 0.01ms !important;
            animation-duration: 0.01ms !important;
        }
    }

    /* ── Hero floating card animation ── */
    @media (prefers-reduced-motion: no-preference) {
        .float-slow {
            animation: floatSlow 6s ease-in-out infinite;
        }
    }

    @keyframes floatSlow {
        0%, 100% { transform: translateY(0px); }
        50% { transform: translateY(-8px); }
    }

    /* ── Form focus styles ── */
    input:focus,
    select:focus,
    textarea:focus {
        outline: none;
    }

    /* ── Selection color ── */
    ::selection {
        background: #99f6e4;
        color: #042f2e;
    }

    /* ── Utility ── */
    .sr-only {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border-width: 0;
    }