/* ===== BASE & RESET ===== */
    *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

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

    body {
        overflow-x: hidden;
    }

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

    /* ===== NAVBAR ===== */
    #navbar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1000;
        background: rgba(255, 255, 255, 0.0);
        transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
    }

    #navbar.nav-scrolled {
        background: rgba(255, 255, 255, 0.97);
        box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
        backdrop-filter: blur(12px);
    }

    #navbar nav {
        transition: padding 0.3s ease;
    }

    /* ===== HERO ===== */
    .hero-bg {
        position: relative;
    }

    /* ===== SERVICE CARDS ===== */
    .service-card {
        will-change: transform;
    }

    /* ===== PROJECT CARDS ===== */
    .project-card {
        cursor: pointer;
    }

    /* ===== SCROLL REVEAL (progressive enhancement) ===== */
    @media (prefers-reduced-motion: no-preference) {
        .reveal {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 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; }
        .reveal-delay-5 { transition-delay: 0.5s; }
        .reveal-delay-6 { transition-delay: 0.6s; }
    }

    /* ===== MOBILE MENU ===== */
    #mobile-menu {
        animation: slideDown 0.3s ease;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* ===== BUTTON HOVER EFFECTS ===== */
    a, button {
        -webkit-tap-highlight-color: transparent;
    }

    /* ===== SELECTION ===== */
    ::selection {
        background: rgba(13, 148, 136, 0.2);
        color: #0f766e;
    }

    /* ===== FOCUS STYLES ===== */
    :focus-visible {
        outline: 2px solid #0d9488;
        outline-offset: 2px;
    }

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

    ::-webkit-scrollbar-track {
        background: #f1f5f9;
    }

    ::-webkit-scrollbar-thumb {
        background: #94a3b8;
        border-radius: 4px;
    }

    ::-webkit-scrollbar-thumb:hover {
        background: #64748b;
    }

    /* ===== UTILITY ===== */
    @media (max-width: 767px) {
        .font-serif {
            font-size: 2rem !important;
        }
    }