/* Header styles */
header {
    background-color: #fff;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
    border-bottom: 1px solid var(--border-color);
}

header.scrolled {
    box-shadow: var(--shadow-md);
    height: 70px;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: translateY(-2px);
}

.logo img {
    max-height: 50px;
    transition: all 0.3s ease;
}

header.scrolled .logo img {
    max-height: 45px;
}

nav {
    display: flex;
    align-items: center;
}

nav ul {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

nav a {
    color: var(--dark-color);
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    position: relative;
    display: inline-flex;
    align-items: center;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

nav a:hover {
    color: var(--primary-color);
}

nav a.active {
    color: var(--primary-color);
    font-weight: 600;
}

nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--secondary-color);
}

nav a.btn-primary {
    color: white;
    padding: 0.6rem 1.2rem;
    margin-left: var(--spacing-sm);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 4px rgba(30, 80, 145, 0.2);
    transition: all 0.3s ease;
}

nav a.btn-primary:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(30, 80, 145, 0.3);
}

nav a.btn-primary.active {
    background-color: var(--accent-color);
    box-shadow: 0 2px 6px rgba(30, 80, 145, 0.3), inset 0 1px 3px rgba(255, 255, 255, 0.2);
}

nav a.btn-primary::after {
    display: none;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
    z-index: 1010;
}

.mobile-menu-btn span {
    width: 100%;
    height: 2px;
    background-color: var(--dark-color);
    transition: all 0.3s ease;
    border-radius: 2px;
}

nav.open .mobile-menu-btn span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 6px);
}

nav.open .mobile-menu-btn span:nth-child(2) {
    opacity: 0;
}

nav.open .mobile-menu-btn span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -6px);
}

/* Responsive styles */
@media (max-width: 991px) {
    .mobile-menu-btn {
        display: flex;
    }

    nav ul {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: white;
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s ease;
        pointer-events: none;
        z-index: 999;
        align-items: center;
        gap: var(--spacing-lg);
        border-bottom: 1px solid var(--border-color);
    }

    nav.open ul {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    nav a.btn-primary {
        margin-top: var(--spacing-md);
        margin-left: 0;
    }
}

@media (max-width: 480px) {
    .logo img {
        max-height: 40px;
    }
    
    header.scrolled .logo img {
        max-height: 35px;
    }
}