.header {
    position: fixed; width: 100%; top: 0; left: 0;
    z-index: 1000; padding: 1.5rem 0;
    background: var(--background-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border-bottom: 1px solid #EAEAEA;
}
.navbar { display: flex; justify-content: space-between; align-items: center; }
.nav-logo img { height: 50px; width: auto; }
.nav-menu { display: none; list-style: none; gap: 3rem; align-items: center; }
.nav-link {
    text-decoration: none; color: var(--dark-green);
    font-weight: 700; position: relative; padding-bottom: 5px;
    font-size: 1rem;
}
.nav-link::after {
    content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 2px;
    background: var(--primary-green); transform: scaleX(0); transform-origin: right;
    transition: transform 0.4s ease-out;
}
.nav-link:hover::after { transform: scaleX(1); transform-origin: left; }
.nav-right { display: flex; align-items: center; gap: 1.5rem; }
.hamburger {
    display: flex; flex-direction: column; justify-content: space-around;
    width: 28px; height: 24px; background: transparent; border: none;
    z-index: 1001;
}
.hamburger .bar {
    width: 100%; height: 3px; background-color: var(--dark-green);
    border-radius: 10px; transition: all 0.3s ease-in-out;
}
body.nav-open .hamburger .bar:nth-child(1) { transform: translateY(10px) rotate(45deg); }
body.nav-open .hamburger .bar:nth-child(2) { opacity: 0; }
body.nav-open .hamburger .bar:nth-child(3) { transform: translateY(-10px) rotate(-45deg); }
body.nav-open { overflow: hidden; }
.mobile-nav {
    position: fixed; top: 0; right: 0;
    width: 100%; height: 100%;
    background-color: var(--soft-beige);
    z-index: 999;
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    opacity: 0;
    visibility: hidden;
    transform: translateX(20px);
    transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.4s ease;
}
body.nav-open .mobile-nav {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}
.mobile-link {
    font-family: var(--font-heading); font-size: clamp(2rem, 8vw, 3rem);
    color: var(--dark-green); text-decoration: none;
    margin: 1.5rem 0;
}
@media (min-width: 769px) {
    .nav-menu { display: flex; }
    .hamburger { display: none; }
}