/* ==========================================================================
   Navigation - Modern Design
   ========================================================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: transparent;
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem var(--container-padding);
    transition: padding var(--transition-base);
}

.header.scrolled .nav { padding: 1rem var(--container-padding); }

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    z-index: var(--z-overlay);
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.header.scrolled .logo-icon { color: var(--color-primary); }

.logo-text {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: var(--weight-bold);
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.header.scrolled .logo-text { color: var(--color-text-primary); }

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    position: relative;
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-light);
    text-decoration: none;
    padding: 0.5rem 0;
    transition: color var(--transition-fast);
}

.header.scrolled .nav-link { color: var(--color-text-primary); }

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-link:hover, .nav-link.active { color: var(--color-accent); }

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    z-index: var(--z-overlay);
}

.nav-cta {
    padding: 0.625rem 1.5rem;
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    color: var(--color-text-light);
    background: var(--color-accent);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.header.scrolled .nav-cta { color: var(--color-text-light); }

.nav-cta:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    gap: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-light);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.header.scrolled .nav-toggle span { background: var(--color-text-primary); }

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-primary);
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 1.5rem;
}

.mobile-nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 3rem;
}

.mobile-logo {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
}

.mobile-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--color-text-primary);
}

.mobile-nav-menu { flex: 1; }

.mobile-nav-menu li { margin-bottom: 0.5rem; }

.mobile-nav-link {
    display: block;
    padding: 1rem 0;
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: var(--weight-semibold);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.mobile-nav-link:hover { color: var(--color-accent); }

.mobile-lang-switcher {
    display: flex;
    gap: 1rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--color-bg-tertiary);
    margin-top: 1.5rem;
}

.mobile-lang-btn {
    padding: 0.5rem 1rem;
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-secondary);
    background: transparent;
    border: 1px solid var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mobile-lang-btn:hover, .mobile-lang-btn.active {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.mobile-contact-info {
    padding: 1.5rem 0;
    border-top: 1px solid var(--color-bg-tertiary);
}

.mobile-contact-info a {
    display: block;
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 0.5rem 0;
}

.mobile-contact-info a:hover { color: var(--color-accent); }

.nav-toggle, .mobile-lang-switcher, .mobile-contact-info { display: none; }

@media (max-width: 992px) {
    .nav-menu { display: none; }
    .nav-toggle { display: flex; }
    .nav-cta { display: none; }
}