/* Navigation Styles */
.main-nav {
    background: var(--content-bg);
    box-shadow: 0 2px 8px var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 70px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.logo img {
    width: auto;
    height: auto;
    max-height: 64px;
    max-width: min(75vw, 340px);
    transition: all 0.3s ease;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.logo:hover img {
    transform: scale(1.05);
    filter: drop-shadow(0 3px 6px rgba(74, 144, 226, 0.3));
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 4px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(10px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-10px);
}

/* Navigation Menu */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 26px;
    align-items: center;
}

.nav-menu > li {
    position: relative;
}

.nav-menu > li > a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.05em;
    font-weight: 500;
    padding: 8px 0;
    transition: color 0.3s ease;
    display: block;
}

.nav-menu > li > a:hover,
.nav-menu > li > a.active {
    color: var(--accent-primary);
}

.nav-menu > li > a.active {
    position: relative;
}

.nav-menu > li > a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--content-bg);
    list-style: none;
    padding: 10px 0;
    min-width: 250px;
    box-shadow: 0 4px 12px var(--shadow-medium);
    border-radius: var(--border-radius);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    margin-top: 10px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    padding: 0;
}

.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: background 0.3s ease, color 0.3s ease;
    font-size: 1em;
}

.dropdown-menu a:hover {
    background: var(--primary-bg);
    color: var(--accent-primary);
}

/* Responsive Navigation */
@media (max-width: 1100px) {
    .nav-menu {
        gap: 20px;
    }

    .nav-menu > li > a {
        font-size: 1em;
    }
}

@media (max-width: 980px) {
    .nav-container {
        padding: 0 16px;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--content-bg);
        flex-direction: column;
        gap: 0;
        padding: 20px;
        box-shadow: 0 4px 12px var(--shadow-medium);
        transform: translateY(-100vh);
        transition: transform 0.3s ease;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-menu > li {
        width: 100%;
        border-bottom: 1px solid var(--primary-bg);
    }

    .nav-menu > li:last-child {
        border-bottom: none;
    }

    .nav-menu > li > a {
        padding: 15px 0;
        font-size: 1.1em;
    }

    /* Mobile Dropdown */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        margin-top: 0;
        padding: 0;
        background: var(--primary-bg);
        border-radius: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    .dropdown.active .dropdown-menu {
        max-height: 300px;
        padding: 10px 0;
    }

    .dropdown > a::after {
        content: ' ▼';
        font-size: 0.8em;
        margin-left: 5px;
        transition: transform 0.3s ease;
        display: inline-block;
    }

    .dropdown.active > a::after {
        transform: rotate(180deg);
    }

    .dropdown-menu a {
        padding: 12px 20px;
        font-size: 0.95em;
    }
}

@media (max-width: 600px) {
    .logo img {
        max-height: 52px;
        max-width: min(82vw, 280px);
    }

    .nav-container {
        padding: 0 14px;
        min-height: 60px;
    }

    .nav-menu {
        top: 60px;
        max-height: calc(100vh - 60px);
    }
}

@media (max-width: 420px) {
    .logo img {
        max-height: 46px;
        max-width: min(88vw, 240px);
    }
}