/* ============ Navigation ============ */
#nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--nav-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 max(40px, calc((100vw - 1240px) / 2));
    transition: background 0.4s, box-shadow 0.4s;
    background: #fff;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

#nav.scrolled {
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

#nav .nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #333;
    text-decoration: none;
    transition: color 0.4s;
}

#nav .nav-logo .logo-img {
    height: 52px;
    width: auto;
    display: block;
}

#nav.scrolled .nav-logo {
    color: #333;
}

#nav .nav-menu {
    display: flex;
    align-items: center;
    gap: 0;
}

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

#nav .nav-menu>li>a {
    display: block;
    padding: 28px 16px;
    font-size: 15px;
    color: #333;
    transition: color 0.3s;
    white-space: nowrap;
    font-weight: 500;
    letter-spacing: 1px;
}

#nav.scrolled .nav-menu>li>a {
    color: #333;
}

#nav .nav-menu>li>a:hover,
#nav .nav-menu>li.active>a {
    color: var(--color1);
}

#nav .sub-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    min-width: 150px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 8px;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(12px);
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

#nav .nav-menu>li:hover .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

#nav .sub-menu a {
    display: block;
    padding: 11px 24px;
    font-size: 13px;
    color: #555;
    transition: all 0.2s ease;
    white-space: nowrap;
    position: relative;
}

#nav .sub-menu a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--color1);
    border-radius: 0 2px 2px 0;
    transition: height 0.2s ease;
}

#nav .sub-menu a:hover {
    color: var(--color1);
    background: rgba(26, 86, 219, 0.05);
    padding-left: 30px;
}

#nav .sub-menu a:hover::before {
    height: 55%;
}







#nav .nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    z-index: 1001;
}

#nav .nav-toggle span {
    width: 26px;
    height: 2px;
    background: #333;
    transition: 0.3s;
}

#nav.scrolled .nav-toggle span {
    background: #333;
}

/* Mobile nav */
#mobile-nav {
    position: fixed;
    inset: 0;
    z-index: 999;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 12px;
    opacity: 0;
    visibility: hidden;
    transition: 0.4s;
}

#mobile-nav.open {
    opacity: 1;
    visibility: visible;
}

#mobile-nav a {
    font-size: 20px;
    color: #fff;
    padding: 10px 0;
}

#mobile-nav .sub-links {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding-left: 20px;
}

#mobile-nav .sub-links a {
    font-size: 16px;
    color: #aaa;
}


/* ============ Responsive ============ */
@media (max-width: 900px) {
    #nav {
        padding: 0 16px;
    }

    #nav .nav-menu {
        display: none;
    }


    #nav .nav-toggle {
        display: flex;
    }

    #nav.scrolled {
        background: rgba(255, 255, 255, 0.98);
    }
}